editor.js

   1 // Copyright 2015 Jason Woofenden
   2 // This file implements an WYSIWYG editor in the browser (no contenteditable)
   3 //
   4 // This program is free software: you can redistribute it and/or modify it under
   5 // the terms of the GNU Affero General Public License as published by the Free
   6 // Software Foundation, either version 3 of the License, or (at your option) any
   7 // later version.
   8 //
   9 // This program is distributed in the hope that it will be useful, but WITHOUT
  10 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  11 // FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
  12 // details.
  13 //
  14 // You should have received a copy of the GNU Affero General Public License
  15 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 (function() {
  18 var KEY_BACKSPACE, KEY_DELETE, KEY_DOWN, KEY_END, KEY_ENTER, KEY_ESCAPE, KEY_HOME, KEY_INSERT, KEY_LEFT, KEY_PAGE_DOWN, KEY_PAGE_UP, KEY_RIGHT, KEY_TAB, KEY_UP, breathing_room, control_key_codes, enc_attr_regex, enc_text_regex, event_return, find_prev_cursor_position, find_up_cursor_position, get_el_bounds, ignore_key_codes, js_attr_regex, multi_sp_regex, no_text_elements, overlay_padding, text_range_bounds, valid_attr_regex, void_elements, ws_props, xy_to_cursor, slice = [].slice
  19
  20 // SETTINGS
  21 overlay_padding = 10
  22 breathing_room = 30 // minimum pixels above/below cursor (scrolling)
  23
  24 function timeout (ms, cb) {
  25         return setTimeout(cb, ms)
  26 }
  27
  28 function next_frame (cb) {
  29         if (window.requestAnimationFrame != null) {
  30                 window.requestAnimationFrame(cb)
  31         } else {
  32                 timeout(16, cb)
  33         }
  34 }
  35
  36 function this_url_sans_path () {
  37         var clip, ret
  38         ret = "" + window.location.href
  39         clip = ret.lastIndexOf('#')
  40         if (clip > -1) {
  41                 ret = ret.substr(0, clip)
  42         }
  43         clip = ret.lastIndexOf('?')
  44         if (clip > -1) {
  45                 ret = ret.substr(0, clip)
  46         }
  47         clip = ret.lastIndexOf('/')
  48         if (clip > -1) {
  49                 ret = ret.substr(0, clip + 1)
  50         }
  51         return ret
  52 }
  53
  54 // table too look up the properties of various values for css's white-space
  55 ws_props = {
  56         normal: {
  57                 space: false,           // spaces are not preserved/rendered
  58                 newline: false,         // newlines are not preserved/rendered
  59                 wrap: true,             // text is word-wrapped
  60                 to_preserve: 'pre-wrap' // to preservespaces, change white-space to this
  61         },
  62         nowrap: {
  63                 space: false,
  64                 newline: false,
  65                 wrap: false,
  66                 to_preserve: 'pre'
  67         },
  68         'pre-line': {
  69                 space: false,
  70                 newline: true,
  71                 wrap: true,
  72                 to_preserve: 'pre-wrap'
  73         },
  74         pre: {
  75                 space: true,
  76                 newline: true,
  77                 wrap: false,
  78                 to_collapse: 'nowrap'
  79         },
  80         'pre-wrap': {
  81                 space: true,
  82                 newline: true,
  83                 wrap: true,
  84                 to_collapse: 'normal'
  85         }
  86 }
  87
  88 // xml 1.0 spec, chromium and firefox accept these, plus lots of unicode chars
  89 valid_attr_regex = new RegExp('^[a-zA-Z_:][-a-zA-Z0-9_:.]*$')
  90 // html5 spec is much more lax, but chromium won't let me make at attribute with the name "4"
  91 js_attr_regex = new RegExp('^[oO][nN].')
  92 // html5 spec says that only these characters are collapsable
  93 multi_sp_regex = new RegExp('[\u0020\u0009\u000a\u000c\u000d][\u0020\u0009\u000a\u000c\u000d]')
  94
  95 function str_has_ws_run (str) {
  96         return multi_sp_regex.test(str)
  97 }
  98
  99 // text nodes don't have getBoundingClientRect(), so use selection api to find
 100 // it.
 101 get_el_bounds = window.bounds = function(el) {
 102         var doc, range, rect, win, x_fix, y_fix
 103         if (el.getBoundingClientRect != null) {
 104                 rect = el.getBoundingClientRect()
 105         } else {
 106                 // text nodes don't have getBoundingClientRect(), so use range api
 107                 range = el.ownerDocument.createRange()
 108                 range.selectNodeContents(el)
 109                 rect = range.getBoundingClientRect()
 110         }
 111         doc = el.ownerDocument.documentElement
 112         win = el.ownerDocument.defaultView
 113         y_fix = win.pageYOffset - doc.clientTop
 114         x_fix = win.pageXOffset - doc.clientLeft
 115         return {
 116                 x: rect.left + x_fix,
 117                 y: rect.top + y_fix,
 118                 w: rect.width != null ? rect.width : rect.right - rect.left,
 119                 h: rect.height != null ? rect.height : rect.top - rect.bottom
 120         }
 121 }
 122
 123 function is_display_block (el) {
 124         if (el.currentStyle != null) {
 125                 return el.currentStyle.display === 'block'
 126         } else {
 127                 return window.getComputedStyle(el, null).getPropertyValue('display') === 'block'
 128         }
 129 }
 130
 131 // Pass return value from dom event handlers to this.
 132 // If they return false, this will addinionally stop propagation and default.
 133 function event_return (e, bool) {
 134         if (bool === false) {
 135                 if (e.stopPropagation != null) {
 136                         e.stopPropagation()
 137                 }
 138                 if (e.preventDefault != null) {
 139                         e.preventDefault()
 140                 }
 141         }
 142         return bool
 143 }
 144
 145 // Warning: currently assumes you're asking about a single character
 146 // Note: chromium returns multiple bounding rects for a space at a line-break
 147 // Note: chromium's getBoundingClientRect() is broken (when zero-area client rects)
 148 // Note: sometimes returns null (eg for whitespace that is not visible)
 149 text_range_bounds = function(el, start, end) {
 150         var doc, range, rect, rects, win, x_fix, y_fix
 151         range = document.createRange()
 152         range.setStart(el, start)
 153         range.setEnd(el, end)
 154         rects = range.getClientRects()
 155         if (rects.length > 0) {
 156                 if (rects.length > 1) {
 157                         if (rects[1].width > rects[0].width) {
 158                                 rect = rects[1]
 159                         } else {
 160                                 rect = rects[0]
 161                         }
 162                 } else {
 163                         rect = rects[0]
 164                 }
 165         } else {
 166                 return null
 167         }
 168         doc = el.ownerDocument.documentElement
 169         win = el.ownerDocument.defaultView
 170         y_fix = win.pageYOffset - doc.clientTop
 171         x_fix = win.pageXOffset - doc.clientLeft
 172         return {
 173                 x: rect.left + x_fix,
 174                 y: rect.top + y_fix,
 175                 w: rect.width != null ? rect.width : rect.right - rect.left,
 176                 h: rect.height != null ? rect.height : rect.top - rect.bottom,
 177                 rects: rects,
 178                 bounding: range.getBoundingClientRect()
 179         }
 180 }
 181
 182 function CursorPosition(args) {
 183         this.n = args.n != null ? args.n : null
 184         this.i = args.i != null ? args.i : null
 185         if (args.x != null) {
 186                 this.x = args.x
 187                 this.y = args.y
 188                 this.h = args.h
 189         } else {
 190                 this.set_xyh()
 191         }
 192 }
 193
 194 CursorPosition.prototype.set_xyh = function() {
 195         var range, ret
 196         range = document.createRange()
 197         if (this.n.text.length === 0) {
 198                 ret = text_range_bounds(this.n.el, 0, 0)
 199         } else if (this.i === this.n.text.length) {
 200                 ret = text_range_bounds(this.n.el, this.i - 1, this.i)
 201                 if (ret != null) {
 202                         ret.x += ret.w
 203                 }
 204         } else {
 205                 ret = text_range_bounds(this.n.el, this.i, this.i + 1)
 206         }
 207         if (ret != null) {
 208                 this.x = ret.x
 209                 this.y = ret.y
 210                 this.h = ret.h
 211         } else {
 212                 this.x = null
 213                 this.y = null
 214                 this.h = null
 215         }
 216         return ret
 217 }
 218
 219 function new_cursor_position (args) {
 220         var ret
 221         ret = new CursorPosition(args)
 222         if (ret.x != null) {
 223                 return ret
 224         }
 225         return null
 226 }
 227
 228 // html encoding for attributes
 229 // encoding nbsp is not required, but hopefully it is useful
 230 enc_attr_regex = new RegExp('(&)|(")|(\u00A0)', 'g')
 231 function enc_attr (txt) {
 232         return txt.replace(enc_attr_regex, function(match, amp, quote) {
 233                 if (amp) {
 234                         return '&amp;'
 235                 }
 236                 if (quote) {
 237                         return '&quot;'
 238                 }
 239                 return '&nbsp;'
 240         })
 241 }
 242 // html encoding for text (does nothing to stop whitespace collapse)
 243 // encoding nbsp is not required, but hopefully it is useful
 244 enc_text_regex = new RegExp('(&)|(<)|(\u00A0)', 'g')
 245 function enc_text (txt) {
 246         return txt.replace(enc_text_regex, function(match, amp, lt) {
 247                 if (amp) {
 248                         return '&amp;'
 249                 }
 250                 if (lt) {
 251                         return '&lt;'
 252                 }
 253                 return '&nbsp;'
 254         })
 255 }
 256
 257 // no closing tag, cannot have children
 258 void_elements = {
 259         area: 1,
 260         base: 1,
 261         br: 1,
 262         col: 1,
 263         embed: 1,
 264         hr: 1,
 265         img: 1,
 266         input: 1,
 267         keygen: 1,
 268         link: 1,
 269         meta: 1,
 270         param: 1,
 271         source: 1,
 272         track: 1,
 273         wbr: 1
 274 }
 275
 276 // contents are not html encoded
 277 var plaintext_elements = {
 278         style: 1,
 279         script: 1,
 280         xmp: 1,
 281         iframe: 1,
 282         noembed: 1,
 283         noframes: 1,
 284         plaintext: 1,
 285         noscript: 1
 286 }
 287
 288 // parser deletes a starting newline inside:
 289 var newline_eating_elements = {
 290         pre: 1,
 291         textarea: 1,
 292         listing: 1
 293 }
 294
 295 // this does not pretty-print
 296 function nodes_to_html (tree) {
 297         var attr_keys, i, k, n, ret
 298         ret = ''
 299         for (i = 0; i < tree.length; ++i) {
 300                 n = tree[i]
 301                 switch (n.type) {
 302                         case 'tag':
 303                                 ret += '<' + n.name
 304                                 attr_keys = []
 305                                 for (k in n.attrs) {
 306                                         ret += " " + k
 307                                         if (n.attrs[k].length > 0) {
 308                                                 ret += "=\"" + (enc_attr(n.attrs[k])) + "\""
 309                                         }
 310                                 }
 311                                 ret += '>'
 312                                 if (void_elements[n.name] == null) {
 313                                         if (n.children.length) {
 314                                                 ret += nodes_to_html(n.children)
 315                                         }
 316                                         ret += "</" + n.name + ">"
 317                                 }
 318                                 break
 319                         case 'text':
 320                                 if (n.parent != null ? plaintext_elements[n.parent.name] : false) {
 321                                         ret += n.text
 322                                 } else if (n.parent != null ? newline_eating_elements[n.parent.name] && n.text.charAt(0) === "\n" : false) {
 323                                         ret += enc_text("\n" + n.text)
 324                                 } else {
 325                                         ret += enc_text(n.text)
 326                                 }
 327                                 break
 328                         case 'comment':
 329                                 ret += "<!--" + n.text + "-->" // TODO encode?
 330                                 break
 331                         case 'doctype':
 332                                 ret += "<!DOCTYPE " + n.name
 333                                 if ((n.public_identifier != null) && n.public_identifier.length > 0) {
 334                                         ret += " \"" + n.public_identifier + "\""
 335                                 }
 336                                 if ((n.system_identifier != null) && n.system_identifier.length > 0) {
 337                                         ret += " \"" + n.system_identifier + "\""
 338                                 }
 339                                 ret += ">"
 340                 }
 341         }
 342         return ret
 343 }
 344
 345 // TODO make these always pretty-print (on the inside) like blocks
 346 // TODO careful though: whitespace might get pushed to parent, which might be rendered
 347 no_text_elements = { // these elements never contain text
 348         select: true,
 349         table: true,
 350         tr: true,
 351         thead: true,
 352         tbody: true,
 353         ul: true,
 354         ol: true
 355 }
 356
 357 function domify (doc, hash) {
 358         var attrs, el, i, k, tag, v
 359         for (tag in hash) {
 360                 attrs = hash[tag]
 361                 if (tag === 'text') {
 362                         return document.createTextNode(attrs)
 363                 }
 364                 el = document.createElement(tag)
 365                 for (k in attrs) {
 366                         v = attrs[k]
 367                         if (k === 'children') {
 368                                 for (i = 0; i < v.length; i++) {
 369                                         el.appendChild(v[i])
 370                                 }
 371                         } else {
 372                                 el.setAttribute(k, v)
 373                         }
 374                 }
 375         }
 376         return el
 377 }
 378
 379 ignore_key_codes = {
 380         '18': true,  // alt
 381         '20': true,  // capslock
 382         '17': true,  // ctrl
 383         '144': true, // numlock
 384         '16': true,  // shift
 385         '91': true   // windows "start" key
 386 }
 387 // key codes: (valid on keydown, not keypress)
 388 KEY_LEFT = 37
 389 KEY_UP = 38
 390 KEY_RIGHT = 39
 391 KEY_DOWN = 40
 392 KEY_BACKSPACE = 8 // <--
 393 KEY_DELETE = 46 // -->
 394 KEY_END = 35
 395 KEY_ENTER = 13
 396 KEY_ESCAPE = 27
 397 KEY_HOME = 36
 398 KEY_INSERT = 45
 399 KEY_PAGE_UP = 33
 400 KEY_PAGE_DOWN = 34
 401 KEY_TAB = 9
 402 control_key_codes = { // we react to these, but they aren't typing
 403         '37': KEY_LEFT,
 404         '38': KEY_UP,
 405         '39': KEY_RIGHT,
 406         '40': KEY_DOWN,
 407         '35': KEY_END,
 408          '8': KEY_BACKSPACE,
 409         '46': KEY_DELETE,
 410         '13': KEY_ENTER,
 411         '27': KEY_ESCAPE,
 412         '36': KEY_HOME,
 413         '45': KEY_INSERT,
 414         '33': KEY_PAGE_UP,
 415         '34': KEY_PAGE_DOWN,
 416          '9': KEY_TAB
 417 }
 418
 419 function instantiate_tree (tree, parent) {
 420         var c, i, k, remove, results, v
 421         remove = []
 422         for (i = 0; i < tree.length; ++i) {
 423                 c = tree[i]
 424                 switch (c.type) {
 425                         case 'text':
 426                                 c.el = parent.ownerDocument.createTextNode(c.text)
 427                                 parent.appendChild(c.el)
 428                         break
 429                         case 'tag':
 430                                 if (c.name === 'script' || c.name === 'object' || c.name === 'iframe' || c.name === 'link') {
 431                                         // TODO put placeholders instead
 432                                         remove.unshift(i)
 433                                         continue
 434                                 }
 435                                 // TODO create in correct namespace
 436                                 c.el = parent.ownerDocument.createElement(c.name)
 437                                 ref1 = c.attrs
 438                                 for (k in ref1) {
 439                                         v = ref1[k]
 440                                         // FIXME if attr_whitelist[k]?
 441                                         if (valid_attr_regex.test(k)) {
 442                                                 if (!js_attr_regex.test(k)) {
 443                                                         c.el.setAttribute(k, v)
 444                                                 }
 445                                         }
 446                                 }
 447                                 parent.appendChild(c.el)
 448                                 if (c.children.length) {
 449                                         instantiate_tree(c.children, c.el)
 450                                 }
 451                 }
 452         }
 453         results = []
 454         for (i = 0; i < remove.length; i++) {
 455                 // FIXME this deletes the wrong node when siblings are removed
 456                 index = remove[i]
 457                 results.push(tree.splice(index, 1))
 458         }
 459         return results
 460 }
 461
 462 function traverse_tree (tree, cb) {
 463         var c, done, i
 464         done = false
 465         for (i = 0; i < tree.length; i++) {
 466                 c = tree[i]
 467                 done = cb(c)
 468                 if (done) {
 469                         return done
 470                 }
 471                 if (c.children.length) {
 472                         done = traverse_tree(c.children, cb)
 473                         if (done) {
 474                                 return done
 475                         }
 476                 }
 477         }
 478         return done
 479 }
 480
 481 function first_cursor_position (tree) {
 482         var found
 483         found = null
 484         traverse_tree(tree, function(node, state) {
 485                 var cursor
 486                 if (node.type === 'text') {
 487                         cursor = new_cursor_position({n: node, i: 0})
 488                         if (cursor != null) {
 489                                 found = cursor
 490                                 return true // done traversing
 491                         }
 492                 }
 493                 return false // not done traversing
 494         })
 495         return found // maybe null
 496 }
 497
 498 // this will fail when text has non-locatable cursor positions (eg collapsed whitespace)
 499 function find_next_cursor_position (tree, cursor) {
 500         var found, new_cursor, state_before
 501         if (cursor.n.type === 'text' && cursor.n.text.length > cursor.i) {
 502                 new_cursor = new_cursor_position({n: cursor.n, i: cursor.i + 1})
 503                 if (new_cursor != null) {
 504                         return new_cursor
 505                 }
 506         }
 507         state_before = true
 508         found = null
 509         traverse_tree(tree, function(node, state) {
 510                 if (node.type === 'text' && state_before === false) {
 511                         new_cursor = new_cursor_position({n: node, i: 0})
 512                         if (new_cursor != null) {
 513                                 found = new_cursor
 514                                 return true // done traversing
 515                         }
 516                 }
 517                 if (node === cursor.n) {
 518                         state_before = false
 519                 }
 520                 return false // not done traversing
 521         })
 522         if (found != null) {
 523                 return found
 524         }
 525         return null
 526 }
 527
 528 function last_cursor_position (tree) {
 529         var found
 530         found = null
 531         traverse_tree(tree, function(node) {
 532                 var cursor
 533                 if (node.type === 'text') {
 534                         cursor = new_cursor_position({n: node, i: node.text.length})
 535                         if (cursor != null) {
 536                                 found = cursor
 537                         }
 538                 }
 539                 return false // not done traversing
 540         })
 541         return found // maybe null
 542 }
 543
 544 // this will fail when text has non-locatable cursor positions (eg collapsed whitespace)
 545 function find_prev_cursor_position (tree, cursor) {
 546         var found, found_prev, new_cursor
 547         if (cursor.n.type === 'text' && cursor.i > 0) {
 548                 new_cursor = new_cursor_position({n: cursor.n, i: cursor.i - 1})
 549                 if (new_cursor != null) {
 550                         return new_cursor
 551                 }
 552         }
 553         found_prev = null
 554         found = null
 555         traverse_tree(tree, function(node) {
 556                 if (node === cursor.n) {
 557                         found = found_prev // maybe null
 558                         return true // done traversing
 559                 }
 560                 if (node.type === 'text') {
 561                         new_cursor = new_cursor_position({n: node, i: node.text.length})
 562                         if (new_cursor != null) {
 563                                 found_prev = new_cursor
 564                         }
 565                 }
 566                 return false // not done traversing
 567         })
 568         return found // maybe null
 569 }
 570
 571 function find_up_cursor_position (tree, cursor, ideal_x) {
 572         var new_cursor, prev_cursor, target_y
 573         new_cursor = cursor
 574         // go prev until we're higher on y axis
 575         while (new_cursor.y >= cursor.y) {
 576                 new_cursor = find_prev_cursor_position(tree, new_cursor)
 577                 if (new_cursor == null) {
 578                         return null
 579                 }
 580         }
 581         // done early if we're already left of old cursor position
 582         if (new_cursor.x <= ideal_x) {
 583                 return new_cursor
 584         }
 585         target_y = new_cursor.y
 586         // search leftward, until we find the closest position
 587         // new_cursor is the prev-most position we've checked
 588         // prev_cursor is the older value, so it's not as prev as new_cursor
 589         while (new_cursor.x > ideal_x && new_cursor.y === target_y) {
 590                 prev_cursor = new_cursor
 591                 new_cursor = find_prev_cursor_position(tree, new_cursor)
 592                 if (new_cursor == null) {
 593                         break
 594                 }
 595         }
 596         // move cursor to prev_cursor or new_cursor
 597         if (new_cursor != null) {
 598                 if (new_cursor.y === target_y) {
 599                         // both valid, and on the same line, use closest
 600                         if ((ideal_x - new_cursor.x) < (prev_cursor.x - ideal_x)) {
 601                                 return new_cursor
 602                         } else {
 603                                 return prev_cursor
 604                         }
 605                 } else {
 606                         // new_cursor on wrong line, use prev_cursor
 607                         return prev_cursor
 608                 }
 609         } else {
 610                 // can't go any further prev, use prev_cursor
 611                 return prev_cursor
 612         }
 613 }
 614
 615 function find_down_cursor_position (tree, cursor, ideal_x) {
 616         var new_cursor, prev_cursor, target_y
 617         new_cursor = cursor
 618         // go next until we move on the y axis
 619         while (new_cursor.y <= cursor.y) {
 620                 new_cursor = find_next_cursor_position(tree, new_cursor)
 621                 if (new_cursor == null) {
 622                         return null
 623                 }
 624         }
 625         // done early if we're already right of old cursor position
 626         if (new_cursor.x >= ideal_x) {
 627                 // this would be strange, but could happen due to runaround
 628                 return new_cursor
 629         }
 630         target_y = new_cursor.y
 631         // search rightward, until we find the closest position
 632         // new_cursor is the next-most position we've checked
 633         // prev_cursor is the older value, so it's not as next as new_cursor
 634         while (new_cursor.x < ideal_x && new_cursor.y === target_y) {
 635                 prev_cursor = new_cursor
 636                 new_cursor = find_next_cursor_position(tree, new_cursor)
 637                 if (new_cursor == null) {
 638                         break
 639                 }
 640         }
 641         if (new_cursor != null) {
 642                 if (new_cursor.y === target_y) {
 643                         // both valid, and on the same line, use closest
 644                         if ((new_cursor.x - ideal_x) < (ideal_x - prev_cursor.x)) {
 645                                 return new_cursor
 646                         } else {
 647                                 return prev_cursor
 648                         }
 649                 } else {
 650                         // new_cursor on wrong line, use prev_cursor
 651                         return prev_cursor
 652                 }
 653         } else {
 654                 // can't go any further prev, use prev_cursor
 655                 return prev_cursor
 656         }
 657 }
 658
 659 function xy_to_cursor (tree, xy) {
 660         var after, before, bounds, cur, guess_i, i, n, ret
 661         for (i = 0; i < tree.length; i++) {
 662                 n = tree[i]
 663                 if (n.type === 'tag' || n.type === 'text') {
 664                         bounds = get_el_bounds(n.el)
 665                         if (xy.x < bounds.x) {
 666                                 continue
 667                         }
 668                         if (xy.x > bounds.x + bounds.w) {
 669                                 continue
 670                         }
 671                         if (xy.y < bounds.y) {
 672                                 continue
 673                         }
 674                         if (xy.y > bounds.y + bounds.h) {
 675                                 continue
 676                         }
 677                         if (n.children.length) {
 678                                 ret = xy_to_cursor(n.children, xy)
 679                                 if (ret != null) {
 680                                         return ret
 681                                 }
 682                         }
 683                         if (n.type === 'text') {
 684                                 // click is within bounding box that contains all text.
 685                                 if (n.text.length === 0) {
 686                                         ret = new_cursor_position({n: n, i: 0})
 687                                         if (ret != null) {
 688                                                 return ret
 689                                         }
 690                                         continue
 691                                 }
 692                                 before = new_cursor_position({n: n, i: 0})
 693                                 if (before == null) {
 694                                         continue
 695                                 }
 696                                 after = new_cursor_position({n: n, i: n.text.length})
 697                                 if (after == null) {
 698                                         continue
 699                                 }
 700                                 if (xy.y < before.y + before.h && xy.x < before.x) {
 701                                         // console.log 'before first char on first line'
 702                                         continue
 703                                 }
 704                                 if (xy.y > after.y && xy.x > after.x) {
 705                                         // console.log 'after last char on last line'
 706                                         continue
 707                                 }
 708                                 if (xy.y < before.y) {
 709                                         console.log("Warning: click in text bounding box but above first line")
 710                                         continue // above first line (runaround?)
 711                                 }
 712                                 if (xy.y > after.y + after.h) {
 713                                         console.log("Warning: click in text bounding box but below last line", xy.y, after.y, after.h)
 714                                         continue // below last line (shouldn't happen?)
 715                                 }
 716                                 while (after.i - before.i > 1) {
 717                                         guess_i = Math.round((before.i + after.i) / 2)
 718                                         cur = new_cursor_position({n: n, i: guess_i})
 719                                         if (cur == null) {
 720                                                 console.log("error: failed to find cursor pixel location for", n, guess_i)
 721                                                 before = null
 722                                                 break
 723                                         }
 724                                         if (xy.y < cur.y || (xy.y <= cur.y + cur.h && xy.x < cur.x)) {
 725                                                 after = cur
 726                                         } else {
 727                                                 before = cur
 728                                         }
 729                                 }
 730                                 if (before == null) { // signals failure to find a cursor position
 731                                         continue
 732                                 }
 733                                 // which one is closest?
 734                                 if (Math.abs(before.x - xy.x) < Math.abs(after.x - xy.x)) {
 735                                         return before
 736                                 } else {
 737                                         return after
 738                                 }
 739                         }
 740                 }
 741         }
 742         return null
 743 }
 744
 745 // browsers collapse these (html5 spec calls these "space characters")
 746 function is_space_code (char_code) {
 747         switch (char_code) {
 748                 case 9:
 749                 case 10:
 750                 case 12:
 751                 case 13:
 752                 case 32:
 753                         return true
 754         }
 755         return false
 756 }
 757 function is_space (chr) {
 758         return is_space_code(chr.charCodeAt(0))
 759 }
 760
 761 function tree_remove_empty_text_nodes (tree) {
 762         var c, empties, i, j, n
 763         empties = []
 764         traverse_tree(tree, function(n) {
 765                 if (n.type === 'text') {
 766                         if (n.text.length === 0) {
 767                                 empties.unshift(n)
 768                         }
 769                 }
 770                 return false // not done traversing
 771         })
 772         for (i = 0; i < empties.length; i++) {
 773                 n = empties[i]
 774                 // don't completely empty the tree
 775                 if (tree.length === 1) {
 776                         if (tree[0].type === 'text') {
 777                                 console.log("oop, leaving a blank node because it's the only thing")
 778                                 return
 779                         }
 780                 }
 781                 n.el.parentNode.removeChild(n.el)
 782                 ref = n.parent.children
 783                 for (j = 0; j < ref.length; ++j) {
 784                         c = ref[j]
 785                         if (c === n) {
 786                                 n.parent.children.splice(j, 1)
 787                                 break
 788                         }
 789                 }
 790         }
 791 }
 792
 793 function PeachHTML5Editor (in_el, options) {
 794         // Options: (all optional)
 795         //   editor_id: "id" attribute for outer-most element created by/for editor
 796         //   css_file: filename of a css file to style editable content
 797         //   on_init: callback for when the editable content is in place
 798         var css, opt_fragment, outer_bounds, outer_iframe_style, outer_wrap
 799         this.options = options != null ? options : {}
 800         this.pretty_print = options.pretty_print != null ? options.pretty_print : true
 801         this.in_el = in_el
 802         this.tree = null // array of Nodes, all editable content
 803         this.tree_parent = null // this.tree is this.children. .el might === this.idoc.body
 804         this.matting = []
 805         this.init_1_called = false // when iframes have loaded
 806         this.outer_iframe // iframe to hold editor
 807         this.outer_idoc // "document" object for this.outer_iframe
 808         this.input_el = null
 809         this.wrap2 = null // scrollbar is on this
 810         this.wrap2_offset = null
 811         this.wrap2_height = null // including padding
 812         this.iframe = null // iframe to hold editable content
 813         this.idoc = null // "document" object for this.iframe
 814         this.cursor = null
 815         this.cursor_el = null
 816         this.cursor_visible = false
 817         this.cursor_ideal_x = null
 818         opt_fragment = this.options.fragment != null ? this.options.fragment : true
 819         this.parser_opts = {}
 820         if (opt_fragment) {
 821                 this.parser_opts.fragment = 'body'
 822         }
 823         this.outer_iframe = domify(document, {iframe: {}})
 824         outer_iframe_style = 'border: none !important; margin: 0 !important; padding: 0 !important; height: 100% !important; width: 100% !important;'
 825         if (this.options.editor_id != null) {
 826                 this.outer_iframe.setAttribute('id', this.options.editor_id)
 827         }
 828         this.outer_iframe.onload = (function(_this) { return function() {
 829                 var icss
 830                 _this.outer_idoc = _this.outer_iframe.contentDocument
 831                 icss = domify(_this.outer_idoc, { style: { children: [
 832                         domify(_this.outer_idoc, {text: css})
 833                 ]}})
 834                 _this.outer_idoc.head.appendChild(icss)
 835                 _this.input_el = domify(_this.outer_idoc, {textarea: {style: "position: relative; left: 100px"}}) // {style: "display: block; position: absolute; top: -1000px; left: 0; height: 500px; width 50em"}})
 836                 _this.input_el.onblur = _this.onblur.bind(_this)
 837                 _this.outer_idoc.body.appendChild(_this.input_el)
 838                 _this.iframe = domify(_this.outer_idoc, {iframe: {sandbox: 'allow-same-origin allow-scripts'}})
 839                 _this.iframe.onload = function() {
 840                         return _this.init_1()
 841                 }
 842                 timeout(200, function() { // firefox never fires this onload
 843                         if (!_this.init_1_called) {
 844                                 return _this.init_1()
 845                         }
 846                 })
 847                 _this.outer_idoc.body.appendChild(
 848                         domify(_this.outer_idoc, {div: {id: 'wrap1', children: [
 849                                 domify(_this.outer_idoc, {div: {
 850                                         style: "position: absolute; top: 0; left: 1px; font-size: 10px",
 851                                         children: [domify(_this.outer_idoc, {text: "Peach HTML5 Editor"})]
 852                                 }}),
 853                                 _this.wrap2 = domify(_this.outer_idoc, {div: {id: 'wrap2', children: [
 854                                         domify(_this.outer_idoc, {div: {id: 'wrap3', children: [
 855                                                 _this.iframe,
 856                                                 _this.overlay = domify(_this.outer_idoc, { div: { id: 'overlay' }})
 857                                         ]}})
 858                                 ]}})
 859                         ]}})
 860                 )
 861         }})(this)
 862         outer_wrap = domify(document, {div: {"class": 'peach_html5_editor' }})
 863         this.in_el.parentNode.appendChild(outer_wrap)
 864         outer_bounds = get_el_bounds(outer_wrap)
 865         if (outer_bounds.w < 300) {
 866                 outer_bounds.w = 300
 867         }
 868         if (outer_bounds.h < 300) {
 869                 outer_bounds.h = 300
 870         }
 871         outer_iframe_style += "width: " + outer_bounds.w + "px; height: " + outer_bounds.h + "px;"
 872         this.outer_iframe.setAttribute('style', outer_iframe_style)
 873         css = this.generate_outer_css({w: outer_bounds.w, h: outer_bounds.h})
 874         outer_wrap.appendChild(this.outer_iframe)
 875 }
 876 PeachHTML5Editor.prototype.init_1 = function() { // this.iframe has loaded (but not it's css)
 877         var istyle
 878         this.idoc = this.iframe.contentDocument
 879         this.init_1_called = true
 880         // chromium doesn't resolve relative urls as though they were at the same domain
 881         // so add a <base> tag
 882         this.idoc.head.appendChild(domify(this.idoc, {base: {href: this_url_sans_path()}}))
 883         // don't let @iframe have scrollbars
 884         this.idoc.head.appendChild(domify(this.idoc, {style: {children: [
 885                 domify(this.idoc, {text: "body { overflow: hidden; }"})
 886         ]}}))
 887         if (this.options.css_file) {
 888                 istyle = domify(this.idoc, {link: {rel: 'stylesheet', href: this.options.css_file}})
 889                 istyle.onload = (function(_this) {
 890                         return function() {
 891                                 return _this.init_2()
 892                         }
 893                 })(this)
 894                 this.idoc.head.appendChild(istyle)
 895         } else {
 896                 this.init_2()
 897         }
 898 }
 899 PeachHTML5Editor.prototype.init_2 = function() { // this.iframe and it's css file(s) are ready
 900         var _this = this
 901         var this_event_bind = function (cb) {
 902                 return function (e) {
 903                         _this.have_focus()
 904                         event_return(e, _this[cb](e))
 905                 }
 906         }
 907         this.overlay.onmousedown = this_event_bind('onclick')
 908         this.overlay.ondoubleclick = this_event_bind('ondoubleclick')
 909         this.outer_idoc.body.onkeyup = this_event_bind('onkeyup')
 910         this.outer_idoc.body.onkeydown = this_event_bind('onkeydown')
 911         this.outer_idoc.body.onkeypress = this_event_bind('onkeypress')
 912         this.load_html(this.in_el.value)
 913         if (this.options.on_init != null) {
 914                 return this.options.on_init()
 915         }
 916 }
 917 PeachHTML5Editor.prototype.generate_outer_css = function(args) {
 918         var frame_width, h, inner_padding, occupy, ret, w
 919         w = args.w != null ? args.w : 300
 920         h = args.h != null ? args.h : 300
 921         inner_padding = args.inner_padding != null ? args.inner_padding : overlay_padding
 922         frame_width = args.frame_width != null ? args.frame_width : inner_padding
 923         occupy = function(left, top, right, bottom) {
 924                 if (top == null) {
 925                         top = left
 926                 }
 927                 if (right == null) {
 928                         right = left
 929                 }
 930                 if (bottom == null) {
 931                         bottom = top
 932                 }
 933                 w -= left + right
 934                 h -= top + bottom
 935                 return Math.max(left, top, right, bottom)
 936         }
 937         ret = ''
 938         ret += 'body {'
 939         ret +=     'margin: 0;'
 940         ret +=     'padding: 0;'
 941         ret +=     'color: black;'
 942         ret +=     'background: white;'
 943         ret +=     'font-family: sans;'
 944         ret += '}'
 945         ret += '#wrap1 {'
 946         ret +=     "border: " + (occupy(1)) + "px solid black;"
 947         ret +=     "padding: " + (occupy(frame_width)) + "px;"
 948         ret += '}'
 949         ret += '#wrap2 {'
 950         ret +=     "border: " + (occupy(1)) + "px solid black;"
 951         this.wrap2_height = h // including padding because padding scrolls
 952         ret +=     "padding: " + (occupy(inner_padding)) + "px;"
 953         ret +=     "padding-right: " + (inner_padding + occupy(0, 0, 15, 0)) + "px;"
 954         ret +=     "width: " + w + "px;"
 955         ret +=     "height: " + h + "px;"
 956         ret += 'overflow-x: hidden;'
 957         ret += 'overflow-y: scroll;'
 958         ret += '}'
 959         ret += '#wrap3 {'
 960         ret += 'position: relative;'
 961         ret +=     "width: " + w + "px;"
 962         ret +=     "min-height: " + h + "px;"
 963         ret += '}'
 964         ret += 'iframe {'
 965         ret += 'box-sizing: border-box;'
 966         ret += 'margin: 0;'
 967         ret += 'border: none;'
 968         ret += 'padding: 0;'
 969         ret +=     "width: " + w + "px;"
 970         //ret +=     "height: " + h + "px;" // height auto-set when content set/changed
 971         ret +=     '-ms-user-select: none;'
 972         ret +=     '-webkit-user-select: none;'
 973         ret +=     '-moz-user-select: none;'
 974         ret +=     'user-select: none;'
 975         ret += '}'
 976         ret += '#overlay {'
 977         ret +=     'position: absolute;'
 978         ret +=     "left: -" + inner_padding + "px;"
 979         ret +=     "top: -" + inner_padding + "px;"
 980         ret +=     "right: -" + inner_padding + "px;"
 981         ret +=     "bottom: -" + inner_padding + "px;"
 982         ret +=     'overflow: hidden;'
 983         ret += '}'
 984         ret += '.lightbox {'
 985         ret +=     'position: absolute;'
 986         ret +=     'background: rgba(100,100,100,0.2);'
 987         ret += '}'
 988         ret += '#cursor {'
 989         ret +=     'position: absolute;'
 990         ret +=     'width: 2px;'
 991         ret +=     'background: linear-gradient(0deg, rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1), rgba(255,255,255,1), rgba(0,0,0,1));'
 992         ret +=     'background-size: 200% 200%;'
 993         ret +=     '-webkit-animation: blink 1s linear normal infinite;'
 994         ret +=     'animation: blink 1s linear normal infinite;'
 995         ret += '}'
 996         ret += '@-webkit-keyframes blink {'
 997         ret +=     '0%{background-position:0% 0%}'
 998         ret +=     '100%{background-position:0% -100%}'
 999         ret += '}'
1000         ret += '@keyframes blink { '
1001         ret +=     '0%{background-position:0% 0%}'
1002         ret +=     '100%{background-position:0% -100%}'
1003         ret += '}'
1004         ret += '.ann_box {'
1005         ret +=     'z-index: 5;'
1006         ret +=     'position: absolute;'
1007         ret +=     'border: 1px solid rgba(0,0,0,0.1);'
1008         ret +=     'outline: 1px solid rgba(255,255,255,0.1);' // in case there's a black background
1009         ret += '}'
1010         ret += '.ann_tag {'
1011         ret +=     'z-index: 10;'
1012         ret +=     'position: absolute;'
1013         ret +=     'font-size: 8px;'
1014         ret +=     'white-space: pre;'
1015         ret +=     'background: rgba(255,255,255,0.4);'
1016         ret +=     '-ms-user-select: none;'
1017         ret +=     '-webkit-user-select: none;'
1018         ret +=     '-moz-user-select: none;'
1019         ret +=     'user-select: none;'
1020         ret += '}'
1021         return ret
1022 }
1023 PeachHTML5Editor.prototype.overlay_event_to_inner_xy = function(e) {
1024         var x, y
1025         if (this.wrap2_offset == null) {
1026                 this.wrap2_offset = get_el_bounds(this.wrap2)
1027         }
1028         x = e.pageX - overlay_padding
1029         y = e.pageY - overlay_padding + this.wrap2.scrollTop
1030         return {
1031                 x: x - this.wrap2_offset.x,
1032                 y: y - this.wrap2_offset.y
1033         }
1034 }
1035 PeachHTML5Editor.prototype.onclick = function(e) {
1036         var new_cursor, xy
1037         xy = this.overlay_event_to_inner_xy(e)
1038         new_cursor = xy_to_cursor(this.tree, xy)
1039         if (new_cursor != null) {
1040                 this.move_cursor(new_cursor)
1041         } else {
1042                 this.kill_cursor()
1043         }
1044         return false
1045 }
1046 PeachHTML5Editor.prototype.ondoubleclick = function(e) {
1047         return false
1048 }
1049 PeachHTML5Editor.prototype.onkeyup = function(e) {
1050         if (e.ctrlKey) {
1051                 return
1052         }
1053         if (ignore_key_codes[e.keyCode] != null) {
1054                 return false
1055         }
1056         //return false if control_key_codes[e.keyCode] != null
1057 }
1058 PeachHTML5Editor.prototype.onkeydown = function(e) {
1059         var new_cursor, saved_ideal_x
1060         if (e.ctrlKey) {
1061                 return
1062         }
1063         if (ignore_key_codes[e.keyCode] != null) {
1064                 return false
1065         }
1066         //return false if control_key_codes[e.keyCode] != null
1067         switch (e.keyCode) {
1068                 case KEY_LEFT:
1069                         if (this.cursor != null) {
1070                                 new_cursor = find_prev_cursor_position(this.tree, this.cursor)
1071                         } else {
1072                                 new_cursor = first_cursor_position(this.tree)
1073                         }
1074                         if (new_cursor != null) {
1075                                 this.move_cursor(new_cursor)
1076                         }
1077                         return false
1078                 case KEY_RIGHT:
1079                         if (this.cursor != null) {
1080                                 new_cursor = find_next_cursor_position(this.tree, this.cursor)
1081                         } else {
1082                                 new_cursor = last_cursor_position(this.tree)
1083                         }
1084                         if (new_cursor != null) {
1085                                 this.move_cursor(new_cursor)
1086                         }
1087                         return false
1088                 case KEY_UP:
1089                         if (this.cursor != null) {
1090                                 new_cursor = find_up_cursor_position(this.tree, this.cursor, this.cursor_ideal_x)
1091                                 if (new_cursor != null) {
1092                                         saved_ideal_x = this.cursor_ideal_x
1093                                         this.move_cursor(new_cursor)
1094                                         this.cursor_ideal_x = saved_ideal_x
1095                                 }
1096                         } else {
1097                                 // move cursor to first position in document
1098                                 new_cursor = first_cursor_position(this.tree)
1099                                 if (new_cursor != null) {
1100                                         this.move_cursor(new_cursor)
1101                                 }
1102                         }
1103                         return false
1104                 case KEY_DOWN:
1105                         if (this.cursor != null) {
1106                                 new_cursor = find_down_cursor_position(this.tree, this.cursor, this.cursor_ideal_x)
1107                                 if (new_cursor != null) {
1108                                         saved_ideal_x = this.cursor_ideal_x
1109                                         this.move_cursor(new_cursor)
1110                                         this.cursor_ideal_x = saved_ideal_x
1111                                 }
1112                         } else {
1113                                 // move cursor to first position in document
1114                                 new_cursor = last_cursor_position(this.tree)
1115                                 if (new_cursor != null) {
1116                                         this.move_cursor(new_cursor)
1117                                 }
1118                         }
1119                         return false
1120                 case KEY_END:
1121                         new_cursor = last_cursor_position(this.tree)
1122                         if (new_cursor != null) {
1123                                 this.move_cursor(new_cursor)
1124                         }
1125                         return false
1126                 case KEY_BACKSPACE:
1127                         this.on_key_backspace(e)
1128                         return false
1129                 case KEY_DELETE:
1130                         if (this.cursor == null) {
1131                                 return false
1132                         }
1133                         new_cursor = find_next_cursor_position(this.tree, {n: this.cursor.n, i: this.cursor.i})
1134                         // try moving cursor right and then running backspace code
1135                         // TODO replace this hack with a real implementation
1136                         if (new_cursor != null) {
1137                                 // try to detect common case where cursor goes inside an block,
1138                                 // but doesn't pass a character (and advance one more in that case)
1139                                 if (new_cursor.n !== this.cursor.n && new_cursor.i === 0) {
1140                                         if (new_cursor.n.type === 'text' && new_cursor.n.text.length > 0) {
1141                                                 if (new_cursor.n.parent != null) {
1142                                                         if (!this.is_display_block(new_cursor.n.parent)) {
1143                                                                 // FIXME should test run sibling
1144                                                                 new_cursor = new_cursor_position({n: new_cursor.n, i: new_cursor.i + 1})
1145                                                         }
1146                                                 }
1147                                         }
1148                                 }
1149                         }
1150                         if (new_cursor != null) {
1151                                 if (new_cursor.n !== this.cursor.n || new_cursor.i !== this.cursor.i) {
1152                                         this.move_cursor(new_cursor)
1153                                         this.on_key_backspace(e)
1154                                 }
1155                         }
1156                         return false
1157                 case KEY_ENTER:
1158                         this.on_key_enter(e)
1159                         return false
1160                 case KEY_ESCAPE:
1161                         this.kill_cursor()
1162                         return false
1163                 case KEY_HOME:
1164                         new_cursor = first_cursor_position(this.tree)
1165                         if (new_cursor != null) {
1166                                 this.move_cursor(new_cursor)
1167                         }
1168                         return false
1169                 case KEY_INSERT:
1170                         return false
1171                 case KEY_PAGE_UP:
1172                         this.on_page_up_key(e)
1173                         return false
1174                 case KEY_PAGE_DOWN:
1175                         this.on_page_down_key(e)
1176                         return false
1177                 case KEY_TAB:
1178                         return false
1179         }
1180 }
1181 PeachHTML5Editor.prototype.onkeypress = function(e) {
1182         var char, new_cursor
1183         if (e.ctrlKey) {
1184                 return
1185         }
1186         if (ignore_key_codes[e.keyCode] != null) {
1187                 return false
1188         }
1189         char = e.charCode != null ? e.charCode : e.keyCode
1190         if (char && (this.cursor != null)) {
1191                 char = String.fromCharCode(char)
1192                 this.insert_character(this.cursor.n, this.cursor.i, char)
1193                 this.text_cleanup(this.cursor.n)
1194                 this.changed()
1195                 new_cursor = new_cursor_position({n: this.cursor.n, i: this.cursor.i + 1})
1196                 if (new_cursor) {
1197                         this.move_cursor(new_cursor)
1198                 } else {
1199                         console.log("ERROR: couldn't find cursor position after insert")
1200                         this.kill_cursor()
1201                 }
1202         }
1203         return false
1204 }
1205 PeachHTML5Editor.prototype.on_key_enter = function(e) { // enter key pressed
1206         var before, cur_block, i, n, new_cursor, new_node, new_text, parent_el, pc
1207         if (!this.cursor_visible) {
1208                 return
1209         }
1210         cur_block = this.cursor.n
1211         while (true) {
1212                 if (cur_block.type === 'tag') {
1213                         if (is_display_block(cur_block.el)) {
1214                                 break
1215                         }
1216                 }
1217                 if (cur_block.parent == null) {
1218                         return
1219                 }
1220                 cur_block = cur_block.parent
1221         }
1222         // find array to insert new element into
1223         if (cur_block.parent === this.tree_parent) {
1224                 parent_el = this.idoc.body
1225                 pc = this.tree
1226         } else {
1227                 parent_el = cur_block.parent.el
1228                 pc = cur_block.parent.children
1229         }
1230         for (i = 0; i < pc.length; ++i) {
1231                 n = pc[i]
1232                 if (n === cur_block) {
1233                         break
1234                 }
1235         }
1236         i += 1 // we want to be after it
1237         if (i < pc.length) {
1238                 before = pc[i].el
1239         } else {
1240                 before = null
1241         }
1242         // TODO if content after cursor
1243         // TODO new block is empty
1244         new_text = new peach_parser.Node('text', {text: ' '})
1245         new_node = new peach_parser.Node('tag', {
1246                 name: 'p',
1247                 parent: cur_block.parent,
1248                 attrs: {style: 'white-space: pre-wrap'},
1249                 children: [new_text]
1250         })
1251         new_text.parent = new_node
1252         new_text.el = domify(this.idoc, {text: ' '})
1253         new_node.el = domify(this.idoc, {p: {style: 'white-space: pre-wrap', children: [new_text.el]}})
1254         pc.splice(i, 0, new_node)
1255         parent_el.insertBefore(new_node.el, before)
1256         this.changed()
1257         new_cursor = new_cursor_position({
1258                 n: new_text,
1259                 i: 0
1260         })
1261         if (new_cursor == null) {
1262                 throw 'bork bork'
1263         }
1264         this.move_cursor(new_cursor)
1265         // TODO move content past cursor into this new block
1266         return false
1267 }
1268 // unlike the global function, this takes a Node, not an element
1269 PeachHTML5Editor.prototype.is_display_block = function(n) {
1270         // TODO stop calling global function, merge it into here, use iframe's window object
1271         if (n.type !== 'tag') {
1272                 return false
1273         }
1274         return is_display_block(n.el)
1275 }
1276 PeachHTML5Editor.prototype.find_block_parent = function(n) {
1277         while (true) {
1278                 n = n.parent
1279                 if (n == null) {
1280                         return null
1281                 }
1282                 if (this.is_display_block(n)) {
1283                         return n
1284                 }
1285                 if (n === this.tree_parent) {
1286                         return n
1287                 }
1288         }
1289         return null
1290 }
1291 // return a flat array of nodes (text, <br>, and later also inline-block)
1292 // that are flowing/wrapping together. n can be the containing block, or any
1293 // element inside it.
1294 PeachHTML5Editor.prototype.get_text_run = function(n) {
1295         var block, ret
1296         ret = []
1297         if (this.is_display_block(n)) {
1298                 block = n
1299         } else {
1300                 block = this.find_block_parent(n)
1301                 if (block == null) {
1302                         return ret
1303                 }
1304         }
1305         traverse_tree(block.children, (function(_this) { return function(n) {
1306                 var disp
1307                 if (n.type === 'text') {
1308                         ret.push(n)
1309                 } else if (n.type === 'tag') {
1310                         if (n.name === 'br') {
1311                                 ret.push(n)
1312                         } else {
1313                                 disp = _this.computed_style(n)
1314                                 if (disp === 'inline-block') {
1315                                         ret.push(n)
1316                                 }
1317                         }
1318                 }
1319                 return false // not done traversing
1320         }})(this))
1321         return ret
1322 }
1323 PeachHTML5Editor.prototype.node_is_decendant = function(young, old) {
1324         while (young != null && young !== this.tree_parent) {
1325                 if (young === old) {
1326                         return true
1327                 }
1328                 young = young.parent
1329         }
1330         return false
1331 }
1332 // helper for on_key_backspace
1333 PeachHTML5Editor.prototype._merge_left = function(state) {
1334         var pi, prev
1335         // the node prev to n was not prev to it a moment ago, merge with it if reasonable
1336         pi = state.n.parent.children.indexOf(state.n)
1337         if (pi > 0) {
1338                 prev = state.n.parent.children[pi - 1]
1339                 if (prev.type === 'text') {
1340                         state.i = prev.text.length
1341                         prev.text = prev.el.textContent = prev.text + state.n.text
1342                         this.remove_node(state.n)
1343                         state.n = prev
1344                         state.changed = true
1345                         state.moved_cursor = true
1346                 }
1347         }
1348         // else // TODO merge possible consecutive matching inline tags at @cursor
1349         return state
1350 }
1351 // helper for on_key_backspace
1352 // remove n from the dom, also remove its inline parents that are emptied by removing n
1353 PeachHTML5Editor.prototype._backspace_node_helper = function(n, run, run_i) {
1354         var block
1355         if (run == null) {
1356                 run = this.get_text_run(n)
1357         }
1358         if (run_i == null) {
1359                 run_i = run.indexOf(n)
1360         }
1361         block = this.find_block_parent(n)
1362         this.remove_node(n)
1363         n = n.parent
1364         while (n != null && n !== block) {
1365                 // bail if the previous node in this run is also inside the same parent
1366                 if (run_i > 0) {
1367                         if (this.node_is_decendant(run[run_i - 1], n)) {
1368                                 break
1369                         }
1370                 }
1371                 // bail if the next node in this run is also inside the same parent
1372                 if (run_i + 1 < run.length) {
1373                         if (this.node_is_decendant(run[run_i + 1], n)) {
1374                                 break
1375                         }
1376                 }
1377                 // move any sibling nodes to parent. These nodes are not in the text run
1378                 while (n.children.length > 0) {
1379                         this.move_node(n.children[0], n.parent, n)
1380                 }
1381                 // remove (now completely empty) inline parent
1382                 this.remove_node(n)
1383                 // proceed to outer parent
1384                 n = n.parent
1385         }
1386 }
1387 PeachHTML5Editor.prototype.on_key_backspace = function(e) {
1388         var block, changed, merge_state, n, ncb, need_text_cleanup, new_cursor, pcb, post, pre, prev, prev_cursor, run, run_i
1389         if (this.cursor == null) {
1390                 return
1391         }
1392         new_cursor = null
1393         run = null
1394         changed = true
1395         if (this.cursor.i === 0) { // cursor is at start of text node
1396                 if (run == null) {
1397                         run = this.get_text_run(this.cursor.n)
1398                 }
1399                 run_i = run.indexOf(this.cursor.n)
1400                 if (run_i === 0) { // if at start of text run
1401                         block = this.find_block_parent(this.cursor.n)
1402                         prev_cursor = find_prev_cursor_position(this.tree, {n: this.cursor.n, i: 0})
1403                         if (prev_cursor === null) { // if in first text run of document
1404                                 // do nothing (there's nothing text-like to the left of the cursor)
1405                                 return
1406                         }
1407                         // else merge with prev/outer text run
1408                         pcb = this.find_block_parent(prev_cursor.n)
1409                         while (block.children.length > 0) {
1410                                 this.move_node(block.children[0], pcb)
1411                         }
1412                         this.remove_node(block)
1413                         // merge possible consecutive text nodes at @cursor
1414                         merge_state = {n: this.cursor.n}
1415                         this._merge_left(merge_state)
1416                         this.text_cleanup(merge_state.n)
1417                         new_cursor = new_cursor_position({n: merge_state.n, i: merge_state.i})
1418                 } else { // at start of text node, but not start of text run
1419                         prev = run[run_i - 1]
1420                         if (prev.type === 'text') { // if previous in text run is text
1421                                 if (prev.text.length === 1) { // if emptying prev (in text run)
1422                                         this._backspace_node_helper(prev, run, run_i)
1423                                         merge_state = {n: this.cursor.n, i: this.cursor.i}
1424                                         this._merge_left(merge_state)
1425                                         this.text_cleanup(merge_state.n)
1426                                         new_cursor = new_cursor_position({n: merge_state.n, i: merge_state.i})
1427                                 } else { // prev in run is text with muliple chars
1428                                         // delete last character in prev
1429                                         prev.text = prev.text.substr(0, prev.text.length - 1)
1430                                         prev.el.textContent = prev.text
1431                                         this.text_cleanup(this.cursor.n)
1432                                         new_cursor = new_cursor_position({n: this.cursor.n, i: this.cursor.i})
1433                                 }
1434                         } else if (prev.name === 'br' || prev.name === 'hr') {
1435                                 this._backspace_node_helper(prev, run, run_i)
1436                                 merge_state = {n: this.cursor.n, i: this.cursor.i}
1437                                 this._merge_left(merge_state)
1438                                 this.text_cleanup(merge_state.n)
1439                                 new_cursor = new_cursor_position({n: merge_state.n, i: merge_state.i})
1440                         }
1441                         // FIXME implement this:
1442                         // else // if prev (in run) is inline-block
1443                                 // if that inline-block has text in it
1444                                         // delete last char in prev inlineblock
1445                                         // if that empties it
1446                                                 // delete it
1447                                                 // merge left
1448                                         // else
1449                                                 // move cursor inside
1450                                 // else
1451                                         // delete prev (inline) block
1452                                         // merge left
1453                                 // auto-delete this @cursor.parent(s) if this empties them
1454                 }
1455         } else { // cursor is not at start of text node
1456                 if (run == null) {
1457                         run = this.get_text_run(this.cursor.n)
1458                 }
1459                 if (this.cursor.n.text.length === 1) { // if emptying text node
1460                         if (run.length === 1) { // if emptying text run (of text/br/hr/inline-block)
1461                                 // remove inline-parents of @cursor.n
1462                                 block = this.find_block_parent(this.cursor.n)
1463                                 changed = false
1464                                 n = this.cursor.n.parent
1465                                 // note: this doesn't use _backspace_node_helper because:
1466                                 // 1. we don't want to delete the target node (we're replacing it's contents)
1467                                 // 2. we want to track whether anything was removed
1468                                 // 3. we know already know there's no other text from this run anywhere
1469                                 while (n && n !== block) {
1470                                         changed = true
1471                                         while (n.children.length > 0) {
1472                                                 this.move_node(n.children[0], n.parent, n)
1473                                         }
1474                                         this.remove_node(n)
1475                                         n = n.parent
1476                                 }
1477                                 // replace @cursor.n with a single (preserved) space
1478                                 if (this.cursor.n.text !== ' ') {
1479                                         changed = true
1480                                         this.cursor.n.text = this.cursor.n.el.textContent = ' '
1481                                 }
1482                                 if (changed) {
1483                                         this.text_cleanup(this.cursor.n)
1484                                 }
1485                                 // place the cursor to the left of that space
1486                                 new_cursor = new_cursor_position({n: this.cursor.n, i: 0})
1487                         } else { // emptying a text node (but not a whole text run)
1488                                 // figure out where cursor should land
1489                                 block = this.find_block_parent(this.cursor.n)
1490                                 new_cursor = find_prev_cursor_position(this.tree, {n: this.cursor.n, i: 0})
1491                                 ncb = this.find_block_parent(new_cursor.n)
1492                                 if (ncb !== block) {
1493                                         new_cursor = find_next_cursor_position(this.tree, {n: this.cursor.n, i: 1})
1494                                 }
1495                                 // delete text node and cleanup emptied parents
1496                                 run_i = run.indexOf(this.cursor.n)
1497                                 this._backspace_node_helper(this.cursor.n, run, run_i)
1498                                 // see if new adjacent siblings should merge
1499                                 // TODO make smarter
1500                                 if (run_i > 0 && run_i + 1 < run.length) {
1501                                         if (run[run_i - 1].type === 'text' && run[run_i + 1].type === 'text') {
1502                                                 merge_state = {n: run[run_i + 1]}
1503                                                 this._merge_left(merge_state)
1504                                                 if (merge_state.moved_cursor) {
1505                                                         new_cursor = merge_state
1506                                                 }
1507                                         }
1508                                 }
1509                                 // update whitespace preservation
1510                                 this.text_cleanup(block)
1511                                 // update cursor x/y in case things moved around
1512                                 if (new_cursor != null) {
1513                                         if (new_cursor.n.el.parentNode) { // still in dom after cleanup
1514                                                 new_cursor = new_cursor_position({n: new_cursor.n, i: new_cursor.i})
1515                                         } else {
1516                                                 new_cursor = null
1517                                         }
1518                                 }
1519                         }
1520                 } else { // there's a char left of cursor that we can delete without emptying anything
1521                         // delete character
1522                         need_text_cleanup = true
1523                         if (this.cursor.i > 1 && this.cursor.i < this.cursor.n.text.length) {
1524                                 pre = this.cursor.n.text.substr(this.cursor.i - 2, 3)
1525                                 post = pre.charAt(0) + pre.charAt(2)
1526                                 if (str_has_ws_run(pre) === str_has_ws_run(post)) {
1527                                         need_text_cleanup = false
1528                                 }
1529                         }
1530                         this.remove_character(this.cursor.n, this.cursor.i - 1)
1531                         // call text_cleanup if whe created/removed a whitespace run
1532                         if (need_text_cleanup) {
1533                                 this.text_cleanup(this.cursor.n)
1534                         }
1535                         new_cursor = new_cursor_position({n: this.cursor.n, i: this.cursor.i - 1})
1536                 }
1537         }
1538         // mark document changed and move the cursor
1539         if (changed != null) {
1540                 this.changed()
1541         }
1542         if (new_cursor != null) {
1543                 this.move_cursor(new_cursor)
1544         } else {
1545                 this.kill_cursor()
1546         }
1547 }
1548 PeachHTML5Editor.prototype.on_page_up_key = function(e) {
1549         var new_cursor, screen_y, scroll_amount
1550         if (this.wrap2.scrollTop === 0) {
1551                 if (this.cursor == null) {
1552                         return
1553                 }
1554                 new_cursor = first_cursor_position(this.tree)
1555                 if (new_cursor != null) {
1556                         if (new_cursor.n !== this.cursor.n || new_cursor.i !== this.cursor.i) {
1557                                 this.move_cursor(new_cursor)
1558                         }
1559                 }
1560                 return
1561         }
1562         if (this.cursor != null) {
1563                 screen_y = this.cursor.y - this.wrap2.scrollTop
1564         }
1565         scroll_amount = this.wrap2_height - breathing_room
1566         this.wrap2.scrollTop = Math.max(0, this.wrap2.scrollTop - scroll_amount)
1567         if (this.cursor != null) {
1568                 return this.move_cursor_into_view(screen_y + this.wrap2.scrollTop)
1569         }
1570 }
1571 PeachHTML5Editor.prototype.on_page_down_key = function(e) {
1572         var lowest_scrollpos, new_cursor, screen_y, scroll_amount
1573         lowest_scrollpos = this.wrap2.scrollHeight - this.wrap2_height
1574         if (this.wrap2.scrollTop === lowest_scrollpos) {
1575                 if (this.cursor == null) {
1576                         return
1577                 }
1578                 new_cursor = last_cursor_position(this.tree)
1579                 if (new_cursor != null) {
1580                         if (new_cursor.n !== this.cursor.n || new_cursor.i !== this.cursor.i) {
1581                                 this.move_cursor(new_cursor)
1582                         }
1583                 }
1584                 return
1585         }
1586         if (this.cursor != null) {
1587                 screen_y = this.cursor.y - this.wrap2.scrollTop
1588         }
1589         scroll_amount = this.wrap2_height - breathing_room
1590         this.wrap2.scrollTop = Math.min(lowest_scrollpos, this.wrap2.scrollTop + scroll_amount)
1591         if (this.cursor != null) {
1592                 this.move_cursor_into_view(screen_y + this.wrap2.scrollTop)
1593         }
1594 }
1595 PeachHTML5Editor.prototype.move_cursor_into_view = function(y_target) {
1596         var cur, far_enough, finder, new_cursor, saved_ideal_x, was, y_max, y_min
1597         if (y_target === this.cursor.y) {
1598                 return
1599         }
1600         was = this.cursor
1601         y_min = this.wrap2.scrollTop
1602         if (this.wrap2.scrollTop !== 0) {
1603                 y_min += breathing_room
1604         }
1605         y_max = this.wrap2.scrollTop + this.wrap2_height
1606         if (this.wrap2.scrollTop !== this.wrap2.scrollHeight - this.wrap2_height) { // downmost
1607                 y_max -= breathing_room
1608         }
1609         y_target = Math.min(y_target, y_max)
1610         y_target = Math.max(y_target, y_min)
1611         if (y_target < this.cursor.y) {
1612                 finder = find_up_cursor_position
1613                 far_enough = function(cur, target_y) {
1614                         return cur.y + cur.h <= target_y
1615                 }
1616         } else {
1617                 finder = find_down_cursor_position
1618                 far_enough = function(cur, y_target) {
1619                         return cur.y >= y_target
1620                 }
1621         }
1622         while (true) {
1623                 cur = finder(this.tree, was, this.cursor_ideal_x)
1624                 if (cur == null) {
1625                         break
1626                 }
1627                 if (far_enough(cur, y_target)) {
1628                         break
1629                 }
1630                 was = cur
1631         }
1632         if (was === this.cursor) {
1633                 was = null
1634         }
1635         if (was != null) {
1636                 if (was.y + was.h > y_max) {
1637                         was = null
1638                 } else if (was.y < y_min) {
1639                         was = null
1640                 }
1641         }
1642         if (cur != null) {
1643                 if (cur.y + cur.h > y_max) {
1644                         cur = null
1645                 } else if (cur.y < y_min) {
1646                         cur = null
1647                 }
1648         }
1649         if ((cur != null) && (was != null)) {
1650                 // both valid, pick best
1651                 if (cur.y < y_min) {
1652                         new_cursor = was
1653                 } else if (was.y + was.h > y_max) {
1654                         new_cursor = cur
1655                 } else if (cur.y - y_target < y_target - was.y) {
1656                         new_cursor = cur
1657                 } else {
1658                         new_cursor = was
1659                 }
1660         } else {
1661                 new_cursor = was != null ? was : cur
1662         }
1663         if (new_cursor != null) {
1664                 saved_ideal_x = this.cursor_ideal_x
1665                 this.move_cursor(new_cursor)
1666                 this.cursor_ideal_x = saved_ideal_x
1667         }
1668 }
1669 // remove all the editable content (and cursor, overlays, etc)
1670 PeachHTML5Editor.prototype.clear_dom = function() {
1671         while (this.idoc.body.childNodes.length) {
1672                 this.idoc.body.removeChild(this.idoc.body.childNodes[0])
1673         }
1674         this.kill_cursor()
1675 }
1676 PeachHTML5Editor.prototype.load_html = function(html) {
1677         this.tree = peach_parser.parse(html, this.parser_opts)
1678         if (this.tree[0] == null ? true : this.tree[0].parent == null) {
1679                 this.tree = peach_parser.parse('<p style="white-space: pre-wrap"> </p>', this.parser_opts)
1680         }
1681         this.tree_parent = this.tree[0].parent
1682         this.tree_parent.el = this.idoc.body
1683         this.clear_dom()
1684         instantiate_tree(this.tree, this.tree_parent.el)
1685         this.collapse_whitespace(this.tree)
1686         return this.changed()
1687 }
1688 PeachHTML5Editor.prototype.changed = function() {
1689         this.in_el.onchange = null
1690         if (this.pretty_print) {
1691                 this.in_el.value = this.pretty_html(this.tree)
1692         } else {
1693                 this.in_el.value = nodes_to_html(this.tree)
1694         }
1695         this.in_el.onchange = (function(_this) { return function() {
1696                 return _this.load_html(_this.in_el.value)
1697         }})(this)
1698         return this.adjust_iframe_height()
1699 }
1700 PeachHTML5Editor.prototype.adjust_iframe_height = function() {
1701         var h, s
1702         s = this.wrap2.scrollTop
1703         // when the content gets shorter, the idoc's body tag will continue to
1704         // report the old (too big) height in Chrome. The workaround is to
1705         // shrink the iframe before the content height:
1706         this.iframe.style.height = "10px"
1707         h = parseInt(this.idoc.body.scrollHeight, 10)
1708         this.iframe.style.height = h + "px"
1709         return this.wrap2.scrollTop = s
1710 }
1711 // true if n is text node with only one caracter, and the only child of a tag
1712 PeachHTML5Editor.prototype.is_only_char_in_tag = function(n, i) {
1713         if (n.type !== 'text') {
1714                 return false
1715         }
1716         if (n.text.length !== 1) {
1717                 return false
1718         }
1719         if (n.parent === this.tree_parent) {
1720                 return false
1721         }
1722         if (n.parent.children.length !== 1) {
1723                 return false
1724         }
1725         return true
1726 }
1727 // true if n is text node with just a space in it, and the only child of a tag
1728 PeachHTML5Editor.prototype.is_lone_space = function(n, i) {
1729         if (n.type !== 'text') {
1730                 return false
1731         }
1732         if (n.text !== ' ') {
1733                 return false
1734         }
1735         if (n.parent === this.tree_parent) {
1736                 return false
1737         }
1738         if (n.parent.children.length !== 1) {
1739                 return false
1740         }
1741         return true
1742 }
1743 // detect special case: typing before a space that's the only thing in a block/doc
1744 // reason: enter key creates blocks with just a space in them
1745 PeachHTML5Editor.prototype.insert_should_replace = function(n, i) {
1746         if (i !== 0) {
1747                 return false
1748         }
1749         if (n.text !== ' ') {
1750                 return false
1751         }
1752         if (n.parent === this.tree_parent) {
1753                 return true
1754         }
1755         if (n.parent.children.length === 1) {
1756                 if (n.parent.children[0] === n) {
1757                         // n is only child
1758                         return true
1759                 }
1760         }
1761         return false
1762 }
1763 // WARNING:  after calling this, you MUST call changed() and text_cleanup()
1764 PeachHTML5Editor.prototype.insert_character = function(n, i, char) {
1765         if (n.parent === this.tree_parent) {
1766                 // FIXME implement text nodes at top level
1767                 return
1768         }
1769         // insert the character
1770         if (this.insert_should_replace(n, i)) {
1771                 n.text = char
1772         } else if (i === 0) {
1773                 n.text = char + n.text
1774         } else if (i === n.text.length) {
1775                 n.text += char
1776         } else {
1777                 n.text = n.text.substr(0, i) + char + n.text.substr(i)
1778         }
1779         return n.el.nodeValue = n.text
1780 }
1781 // WARNING: after calling this, you MUST call changed() and text_cleanup()
1782 PeachHTML5Editor.prototype.remove_character = function(n, i) {
1783         n.text = n.text.substr(0, i) + n.text.substr(i + 1)
1784         return n.el.nodeValue = n.text
1785 }
1786 PeachHTML5Editor.prototype.computed_style = function(n, prop) {
1787         var style
1788         if (n.type === 'text') {
1789                 n = n.parent
1790         }
1791         style = this.iframe.contentWindow.getComputedStyle(n.el, null)
1792         return style.getPropertyValue(prop)
1793 }
1794 // returns the new white-space value that will preserve spaces for node n
1795 PeachHTML5Editor.prototype.preserve_space = function(n, ideal_target) {
1796         var target, ws, ref
1797         if (n.type === 'text') {
1798                 target = n.parent
1799         } else {
1800                 target = n
1801         }
1802         while (target !== ideal_target && !target.el.style.whiteSpace) {
1803                 if (target == null) {
1804                         console.log("bug #967123")
1805                         return
1806                 }
1807                 target = target.parent
1808         }
1809         ws = (ref = ws_props[target.el.style.whiteSpace]) != null ? ref.to_preserve : null
1810         if (ws == null) {
1811                 ws = 'pre-wrap'
1812         }
1813         target.el.style.whiteSpace = ws
1814         this.update_style_from_el(target)
1815         return ws
1816 }
1817 PeachHTML5Editor.prototype.update_style_from_el = function(n) {
1818         var style
1819         style = n.el.getAttribute('style')
1820         if (style != null && style != '') {
1821                 return n.attrs.style = style
1822         } else {
1823                 if (n.attrs.style != null) {
1824                         return delete n.attrs.style
1825                 }
1826         }
1827 }
1828 // remove whitespace that would be trimmed
1829 // replace whitespace that would collapse with a single space
1830 // FIXME remove whitespace from after <br> (but not before)
1831 // FIXME rewrite to
1832 //     check computed white-space prop on txt parents
1833 //     batch replace txt node contents (ie don't loop for each char)
1834 PeachHTML5Editor.prototype.collapse_whitespace = function(tree) {
1835         var cur, cur_i, cur_px, first, iterate, next, next_i, next_pos, next_px, operate, pos, prev, prev_i, prev_pos, prev_px, queue, remove, removed_char, replace_with_space
1836         if (tree == null) {
1837                 tree = this.tree
1838         }
1839         prev = cur = next = null
1840         prev_i = cur_i = next_i = 0
1841         prev_pos = pos = next_pos = null
1842         prev_px = cur_px = next_px = null
1843         first = true
1844         removed_char = null
1845
1846         tree_remove_empty_text_nodes(tree)
1847
1848         iterate = function(tree, cb) {
1849                 var advance, block, i, j, n
1850                 for (j = 0; j < tree.length; j++) {
1851                         n = tree[j]
1852                         if (n.type === 'text') {
1853                                 i = 0
1854                                 while (i < n.text.length) { // don't foreach, cb might remove chars
1855                                         advance = cb(n, i)
1856                                         if (advance) {
1857                                                 i += 1
1858                                         }
1859                                 }
1860                         }
1861                         if (n.type === 'tag') {
1862                                 block = is_display_block(n.el)
1863                                 if (block) {
1864                                         cb(null)
1865                                 }
1866                                 if (n.children.length > 0) {
1867                                         iterate(n.children, cb)
1868                                 }
1869                                 if (block) {
1870                                         cb(null)
1871                                 }
1872                         }
1873                 }
1874         }
1875         // remove cur char
1876         remove = function(undo) {
1877                 if (undo) {
1878                         cur.el.textContent = cur.text = (cur.text.substr(0, cur_i)) + removed_char + (cur.text.substr(cur_i))
1879                         if (next === cur) { // in same text node
1880                                 next_i += 1
1881                         }
1882                         return -1
1883                 } else {
1884                         removed_char = cur.text.charAt(cur_i)
1885                         cur.el.textContent = cur.text = (cur.text.substr(0, cur_i)) + (cur.text.substr(cur_i + 1))
1886                         if (next === cur) { // in same text node
1887                                 if (next_i === 0) {
1888                                         throw "how is this possible?"
1889                                 }
1890                                 next_i -= 1
1891                         }
1892                         return 1
1893                 }
1894         }
1895         replace_with_space = function(undo) {
1896                 if (undo) {
1897                         cur.text = (cur.text.substr(0, cur_i)) + removed_char + (cur.text.substr(cur_i + 1))
1898                         cur.el.textContent = cur.text
1899                 } else {
1900                         removed_char = cur.text.charAt(cur_i)
1901                         if (removed_char !== ' ') {
1902                                 cur.text = (cur.text.substr(0, cur_i)) + ' ' + (cur.text.substr(cur_i + 1))
1903                                 cur.el.textContent = cur.text
1904                         }
1905                 }
1906                 return 0
1907         }
1908         // return true if cur was removed from the dom (ie re-use same prev)
1909         operate = function() {
1910                 // cur definitately set
1911                 // prev and/or next might be null, indicating the start/end of a display:block
1912                 var bounds, dbg, fixer, fixers, i, need_undo, new_next_px, new_prev_px, removed, undo_arg
1913                 if (!is_space_code(cur.text.charCodeAt(cur_i))) {
1914                         return false
1915                 }
1916                 fixers = [remove, replace_with_space]
1917                 // check for common case: single whitespace surrounded by non-whitespace chars
1918                 if ((prev != null) && (next != null)) {
1919                         if (!((is_space_code(prev.text.charCodeAt(prev_i))) || (is_space_code(next.text.charCodeAt(next_i))))) {
1920                                 dbg = cur.text.charCodeAt(cur_i)
1921                                 if (cur.text.charAt(cur_i) === ' ') {
1922                                         return false
1923                                 } else {
1924                                         fixers = [replace_with_space]
1925                                 }
1926                         }
1927                 }
1928                 bounds = text_range_bounds(cur.el, cur_i, cur_i + 1)
1929                 // consistent cases:
1930                 // 1. zero rects returned by getClientRects() means collapsed space
1931                 if (bounds === null) {
1932                         return remove()
1933                 }
1934                 // 2. width greater than zero means visible space
1935                 if (bounds.w > 0) {
1936                         // has bounds, don't try removing
1937                         fixers = [replace_with_space]
1938                 }
1939                 // now the weird edge cases...
1940                 //
1941                 // firefox and chromium both report zero width for characters at the end
1942                 // of a line where the text wraps (automatically, due to word-wrap) to
1943                 // the next line. These do not appear to be distinguishable from
1944                 // collapsed spaces via the range/bounds api, so...
1945                 //
1946                 // remove it from the dom, and if prev or next moves, put it back.
1947                 //
1948                 // this block (try changing it, put it back if something moves) is also
1949                 // used on collapsable whitespace characters besides space. In this case
1950                 // the character is replaced with a normal space character instead of
1951                 // removed
1952                 if ((prev != null) && (prev_px == null)) {
1953                         prev_px = new_cursor_position({n: prev, i: prev_i})
1954                 }
1955                 if ((next != null) && (next_px == null)) {
1956                         next_px = new_cursor_position({n: next, i: next_i})
1957                 }
1958                 //if prev is null and next is null
1959                 //      parent_px = cur.parent.el.getBoundingClientRect()
1960                 undo_arg = true // just for readabality
1961                 removed = 0
1962                 for (i = 0; i < fixers.length; i++) {
1963                         fixer = fixers[i]
1964                         if (removed > 0) {
1965                                 break
1966                         }
1967                         removed += fixer()
1968                         need_undo = false
1969                         if (prev != null) {
1970                                 if (prev_px != null) {
1971                                         new_prev_px = new_cursor_position({n: prev, i: prev_i})
1972                                         if (new_prev_px != null) {
1973                                                 if (new_prev_px.x !== prev_px.x || new_prev_px.y !== prev_px.y) {
1974                                                         need_undo = true
1975                                                 }
1976                                         } else {
1977                                                 need_undo = true
1978                                         }
1979                                 } else {
1980                                         console.log("this shouldn't happen, we remove spaces that don't locate")
1981                                 }
1982                         }
1983                         if ((next != null) && !need_undo) {
1984                                 if (next_px != null) {
1985                                         new_next_px = new_cursor_position({n: next, i: next_i})
1986                                         if (new_next_px != null) {
1987                                                 if (new_next_px.x !== next_px.x || new_next_px.y !== next_px.y) {
1988                                                         need_undo = true
1989                                                 }
1990                                         } else {
1991                                                 need_undo = true
1992                                         }
1993                                 }
1994                                 //else
1995                                 //      console.log "removing space becase space after it is collapsed"
1996                         }
1997                         if (need_undo) {
1998                                 removed += fixer(undo_arg)
1999                         }
2000                 }
2001                 if (removed > 0) {
2002                         return true
2003                 } else {
2004                         return false
2005                 }
2006         }
2007         // pass null at start/end of display:block
2008         queue = function(n, i) {
2009                 var advance, removed
2010                 next = n
2011                 next_i = i
2012                 next_px = null
2013                 advance = true
2014                 if (cur != null) {
2015                         removed = operate()
2016                         // don't advance (to the next character next time) if we removed a
2017                         // character from the same text node as ``next``, because doing so
2018                         // renumbers the indexes in that string
2019                         if (removed && cur === next) {
2020                                 advance = false
2021                         }
2022                 } else {
2023                         removed = false
2024                 }
2025                 if (!removed) {
2026                         prev = cur
2027                         prev_i = cur_i
2028                         prev_px = cur_px
2029                 }
2030                 cur = next
2031                 cur_i = next_i
2032                 cur_px = next_px
2033                 return advance
2034         }
2035         queue(null)
2036         iterate(tree, queue)
2037         queue(null)
2038
2039         tree_remove_empty_text_nodes(tree)
2040 }
2041 // call this after you insert or remove inline nodes. It will:
2042 //    merge consecutive text nodes
2043 //    remove empty text nodes
2044 //    adjust white-space property
2045 // note: this assumes that all whitespace in text nodes should be displayed
2046 // (ie not collapse or be trimmed) and will change the white-space property
2047 // as needed to achieve this.
2048 PeachHTML5Editor.prototype.text_cleanup = function(n) {
2049         var block, eats_start_sp, i, last, n_i, need_preserve, prev, prev_i, run, ws
2050         if (this.is_display_block(n)) {
2051                 block = n
2052         } else {
2053                 block = this.find_block_parent(n)
2054                 if (block == null) {
2055                         return
2056                 }
2057         }
2058         run = this.get_text_run(block)
2059         if (run == null) {
2060                 return
2061         }
2062         // merge consecutive text elements
2063         if (run.length > 1) {
2064                 i = 1
2065                 prev = run[0]
2066                 while (i < run.length) {
2067                         n = run[i]
2068                         if (prev.type === 'text' && n.type === 'text') {
2069                                 if (prev.parent === n.parent) {
2070                                         prev_i = n.parent.children.indexOf(prev)
2071                                         n_i = n.parent.children.indexOf(n)
2072                                         if (n_i === prev_i + 1) {
2073                                                 prev.text = prev.text + n.text
2074                                                 prev.el.textContent = prev.text
2075                                                 this.remove_node(n)
2076                                                 run.splice(i, 1)
2077                                                 continue // don't increment i or change prev
2078                                         }
2079                                 }
2080                         }
2081                         i += 1
2082                         prev = n
2083                 }
2084         }
2085         // remove empty text nodes
2086         i = 0
2087         while (i < run.length) {
2088                 n = run[i]
2089                 if (n.type === 'text') {
2090                         if (n.text === '') {
2091                                 this.remove_node(n)
2092                                 // FIXME maybe remove parents recursively if this makes them empty
2093                                 run.splice(i, 1)
2094                                 continue // don't increment i
2095                         }
2096                 }
2097                 i += 1
2098         }
2099         // note: inline tags can have white-space:pre-line/etc
2100         // note: inline-blocks have their whitespace collapsed independantly of outer run
2101         // note: inline-blocks are treated like non-whitespace char even if empty
2102         if (block.el.style.whiteSpace != null) {
2103                 ws = block.el.style.whiteSpace
2104                 if (ws_props[ws]) {
2105                         if (ws_props[ws].space) {
2106                                 if (ws_props[ws].to_collapse === 'normal') {
2107                                         block.el.style.whiteSpace = null
2108                                 } else {
2109                                         block.el.style.whiteSpace = ws_props[ws].to_collapse
2110                                 }
2111                                 this.update_style_from_el(block)
2112                         }
2113                 }
2114         }
2115         // note: space after <br> colapses, but not space before
2116         // check for spaces that would collapse without help
2117         eats_start_sp = true // if the next node starts with space it collapses (unless pre)
2118         prev = null
2119         for (i = 0; i < run.length; ++i) {
2120                 n = run[i]
2121                 if (n.type === 'tag') {
2122                         if (n.name === 'br') {
2123                                 eats_start_sp = true
2124                         } else {
2125                                 eats_start_sp = false
2126                         }
2127                 } else {
2128                         need_preserve = false
2129                         if (n.type !== 'text') {
2130                                 console.log("bug #232308")
2131                                 return
2132                         }
2133                         if (eats_start_sp) {
2134                                 if (is_space_code(n.text.charCodeAt(0))) {
2135                                         need_preserve = true
2136                                 }
2137                         }
2138                         if (!need_preserve) {
2139                                 need_preserve = multi_sp_regex.test(n.text)
2140                         }
2141                         if (need_preserve) {
2142                                 // do we have it already?
2143                                 ws = this.computed_style(n, 'white-space')
2144                                 if (ws_props[ws] != null ? !ws_props[ws].space : true) {
2145                                         // 2nd arg is ideal target for css rule
2146                                         ws = this.preserve_space(n, block)
2147                                 }
2148                                 eats_start_sp = false
2149                         } else {
2150                                 if (is_space_code(n.text.charCodeAt(n.text.length - 1))) {
2151                                         ws = this.computed_style(n, 'white-space')
2152                                         if ((ref1 = ws_props[ws]) != null ? ref1.space : void 0) {
2153                                                 eats_start_sp = false
2154                                         } else {
2155                                                 eats_start_sp = true
2156                                         }
2157                                 } else {
2158                                         eats_start_sp = false
2159                                 }
2160                         }
2161                 }
2162         }
2163         // check if text ends with a collapsable space
2164         if (run.length > 0) {
2165                 last = run[run.length - 1]
2166                 if (last.type === 'text') {
2167                         if (eats_start_sp) {
2168                                 this.preserve_space(last, block)
2169                         }
2170                 }
2171         }
2172 }
2173 PeachHTML5Editor.prototype.css_clear = function(n, prop) {
2174         var css_delimiter_regex, i, styles
2175         if (n.attrs.style == null) {
2176                 return
2177         }
2178         if (n.attrs.style === '') {
2179                 return
2180         }
2181         css_delimiter_regex = new RegExp('\s*;\s*', 'g') // FIXME make this global
2182         styles = n.attrs.style.trim().split(css_delimiter)
2183         if (!(styles.length > 0)) {
2184                 return
2185         }
2186         if (styles[styles.length - 1] === '') {
2187                 styles.pop()
2188                 if (!(styles.length > 0)) {
2189                         return
2190                 }
2191         }
2192         i = 0
2193         while (i < styles.length) {
2194                 if (styles[i].substr(0, 12) === 'white-space:') {
2195                         styles.splice(i, 1)
2196                 } else {
2197                         i += 1
2198                 }
2199         }
2200 }
2201 // WARNING: after calling this one or more times, you MUST:
2202 //    if it's inline: call @text_cleanup
2203 //    call @changed()
2204 PeachHTML5Editor.prototype.remove_node = function(n) {
2205         var i
2206         i = n.parent.children.indexOf(n)
2207         if (i === -1) {
2208                 throw "BUG #9187112313"
2209         }
2210         n.el.parentNode.removeChild(n.el)
2211         n.parent.children.splice(i, 1)
2212 }
2213 // remove a node from the tree/dom, insert into new_parent before insert_before?end
2214 // WARNING: after calling this one or more times, you MUST:
2215 //    if it's inline: call @text_cleanup
2216 //    call @changed()
2217 PeachHTML5Editor.prototype.move_node = function(n, new_parent, insert_before) {
2218         var before_i, i
2219         if (insert_before == null) {
2220                 insert_before = null
2221         }
2222         i = n.parent.children.indexOf(n)
2223         if (i === -1) {
2224                 throw "Error: tried to remove node, but it's not in it's parents list of children"
2225                 return
2226         }
2227         if (insert_before != null) {
2228                 before_i = new_parent.children.indexOf(insert_before)
2229                 if (i === -1) {
2230                         throw "Error: tried to move a node to be before a non-existent node"
2231                 }
2232                 insert_before = insert_before.el
2233         }
2234         this.remove_node(n)
2235         if (insert_before != null) {
2236                 new_parent.el.insertBefore(n.el, insert_before)
2237                 new_parent.children.splice(before_i, 0, n)
2238         } else {
2239                 new_parent.el.appendChild(n.el, insert_before)
2240                 new_parent.children.push(n)
2241         }
2242         n.parent = new_parent
2243 }
2244 // remove it, forget where it was
2245 PeachHTML5Editor.prototype.kill_cursor = function() {
2246         if (this.cursor_visible) {
2247                 this.cursor_el.parentNode.removeChild(this.cursor_el)
2248                 this.cursor_visible = false
2249         }
2250         this.cursor = null
2251         this.annotate(null)
2252 }
2253 PeachHTML5Editor.prototype.move_cursor = function(cursor) {
2254         var height
2255         this.cursor_ideal_x = cursor.x
2256         this.cursor = cursor
2257         if (!this.cursor_visible) {
2258                 this.cursor_el = domify(this.outer_idoc, {div: { id: 'cursor'}})
2259                 this.overlay.appendChild(this.cursor_el)
2260                 this.cursor_visible = true
2261         }
2262         this.cursor_el.style.left = (cursor.x + overlay_padding - 1) + "px"
2263         if (cursor.h < 5) {
2264                 height = 12
2265         } else {
2266                 height = cursor.h
2267         }
2268         this.cursor_el.style.top = (cursor.y + overlay_padding + Math.round(height * .07)) + "px"
2269         this.cursor_el.style.height = (Math.round(height * 0.82)) + "px"
2270         this.annotate(cursor.n)
2271         this.scroll_into_view(cursor.y, height)
2272 }
2273 PeachHTML5Editor.prototype.scroll_into_view = function(y, h) {
2274         var downmost, upmost
2275         if (h == null) {
2276                 h = 0
2277         }
2278         y += overlay_padding // convert units from @idoc to @wrap2
2279         // very top of document
2280         if (y <= breathing_room) {
2281                 this.wrap2.scrollTop = 0
2282                 return
2283         }
2284         // very bottom of document
2285         if (y + h >= this.wrap2.scrollHeight - breathing_room) {
2286                 this.wrap2.scrollTop = this.wrap2.scrollHeight - this.wrap2_height
2287                 return
2288         }
2289         // The most scrolled up (lowest value for scrollTop) that would be OK
2290         upmost = y + h + breathing_room - this.wrap2_height
2291         upmost = Math.max(upmost, 0)
2292         // the most scrolled down (highest value for scrollTop) that would be OK
2293         downmost = y - breathing_room
2294         downmost = Math.min(downmost, this.wrap2.scrollHeight - this.wrap2_height)
2295         if (upmost > downmost) { // means h is too big to fit
2296                 // scroll so top is visible
2297                 this.wrap2.scrollTop = downmost
2298                 return
2299         }
2300         if (this.wrap2.scrollTop < upmost) {
2301                 this.wrap2.scrollTop = upmost
2302                 return
2303         }
2304         if (this.wrap2.scrollTop > downmost) {
2305                 this.wrap2.scrollTop = downmost
2306                 return
2307         }
2308 }
2309 PeachHTML5Editor.prototype.annotate = function(n) {
2310         var alpha, ann_box, ann_tag, bounds, prev_bounds
2311         while (this.matting.length > 0) {
2312                 this.overlay.removeChild(this.matting[0])
2313                 this.matting.shift()
2314         }
2315         if (n == null) {
2316                 return
2317         }
2318         prev_bounds = {x: 0, y: 0, w: 0, h: 0}
2319         alpha = 0.1
2320         while (((n != null ? n.el : void 0) != null) && n !== this.tree_parent) {
2321                 if (n.type === 'text') {
2322                         n = n.parent
2323                         continue
2324                 }
2325                 bounds = get_el_bounds(n.el)
2326                 if (bounds == null) {
2327                         return
2328                 }
2329                 if (bounds.x === prev_bounds.x && bounds.y === prev_bounds.y && bounds.w === prev_bounds.w && bounds.h === prev_bounds.h) {
2330                         n = n.parent
2331                         continue
2332                 }
2333                 ann_box = domify(this.outer_idoc, {div: {"class": 'ann_box', style: "left: " + (bounds.x - 1 + overlay_padding) + "px; top: " + (bounds.y - 2 + overlay_padding) + "px; width: " + bounds.w + "px; height: " + bounds.h + "px"}}) // outline: 1000px solid rgba(0,153,255,#{alpha});
2334                 this.overlay.appendChild(ann_box)
2335                 this.matting.push(ann_box)
2336                 ann_tag = domify(this.outer_idoc, {div: {"class": 'ann_tag', style: "left: " + (bounds.x + 1 + overlay_padding) + "px; top: " + (bounds.y - 7 + overlay_padding) + "px",children: [domify(this.outer_idoc, {text: " " + n.name + " "})]}})
2337                 this.overlay.appendChild(ann_tag)
2338                 this.matting.push(ann_tag)
2339                 n = n.parent
2340                 alpha *= 1.5
2341         }
2342 }
2343 PeachHTML5Editor.prototype.pretty_html = function(tree, indent, parent_flags) {
2344         var attr_keys, cs, display, float, i, j, in_flow, in_flow_block, inner_flags, is_block, is_br, is_text, k, n, next_indent, position, prev_in_flow_is_block, prev_in_flow_is_text, ret, visibility, want_nl, whitespace
2345         if (indent == null) {
2346                 indent = ''
2347         }
2348         if (parent_flags == null) {
2349                 parent_flags = {
2350                         pre_ish: false,
2351                         block: true,
2352                         want_nl: false
2353                 }
2354         }
2355         ret = ''
2356         want_nl = parent_flags.want_nl
2357         prev_in_flow_is_text = false
2358         prev_in_flow_is_block = false
2359         for (i = 0; i < tree.length; ++i) {
2360                 n = tree[i]
2361                 inner_flags = {
2362                         want_nl: true
2363                 }
2364                 is_br = false
2365                 switch (n.type) {
2366                         case 'tag':
2367                                 if (n.name === 'br') {
2368                                         is_br = true
2369                                 }
2370                                 is_text = false
2371                                 if (n.el.currentStyle != null) {
2372                                         cs = n.el.currentStyle
2373                                         whitespace = cs['white-space']
2374                                         display = cs['display']
2375                                         position = cs['position']
2376                                         float = cs['float']
2377                                         visibility = cs['visibility']
2378                                 } else {
2379                                         cs = this.iframe.contentWindow.getComputedStyle(n.el, null)
2380                                         whitespace = cs.getPropertyValue('white-space')
2381                                         display = cs.getPropertyValue('display')
2382                                         position = cs.getPropertyValue('position')
2383                                         float = cs.getPropertyValue('float')
2384                                         visibility = cs.getPropertyValue('visibility')
2385                                 }
2386                                 if (n.name === 'textarea') {
2387                                         inner_flags.pre_ish = true
2388                                 } else {
2389                                         inner_flags.pre_ish = whitespace.substr(0, 3) === 'pre'
2390                                 }
2391                                 switch (float) {
2392                                         case 'left':
2393                                         case 'right':
2394                                                 in_flow = false
2395                                         break
2396                                         default:
2397                                                 switch (position) {
2398                                                         case 'absolute':
2399                                                         case 'fixed':
2400                                                                 in_flow = false
2401                                                         break
2402                                                         default:
2403                                                                 if ('display' === 'none') {
2404                                                                         in_flow = false
2405                                                                 } else {
2406                                                                         switch (visibility) {
2407                                                                                 case 'hidden':
2408                                                                                 case 'collapse':
2409                                                                                         in_flow = false
2410                                                                                 break
2411                                                                                 default:
2412                                                                                         in_flow = true
2413                                                                         }
2414                                                                 }
2415                                                 }
2416                                 }
2417                                 switch (display) {
2418                                         case 'inline':
2419                                         case 'none':
2420                                                 inner_flags.block = false
2421                                                 is_block = in_flow_block = false
2422                                         break
2423                                         case 'inline-black':
2424                                                 inner_flags.block = true
2425                                                 is_block = in_flow_block = false
2426                                         break
2427                                         default:
2428                                                 inner_flags.block = true
2429                                                 is_block = true
2430                                                 in_flow_block = in_flow
2431                                 }
2432                         break
2433                         case 'text':
2434                                 is_text = true
2435                                 is_block = false
2436                                 in_flow = true
2437                                 in_flow_block = false
2438                                 break
2439                         default: // 'comment', 'doctype'
2440                                 is_text = false
2441                                 is_block = false
2442                                 in_flow = false
2443                                 in_flow_block = false
2444                 }
2445                 // print whitespace if we can
2446                 if (!parent_flags.pre_ish) {
2447                         if (!(prev_in_flow_is_text && is_br)) {
2448                                 if ((i === 0 && parent_flags.block) || in_flow_block || prev_in_flow_is_block) {
2449                                         if (want_nl) {
2450                                                 ret += "\n"
2451                                         }
2452                                         ret += indent
2453                                 }
2454                         }
2455                 }
2456                 switch (n.type) {
2457                         case 'tag':
2458                                 ret += '<' + n.name
2459                                 attr_keys = []
2460                                 for (k in n.attrs) {
2461                                         attr_keys.unshift(k)
2462                                 }
2463                                 //attr_keys.sort()
2464                                 for (j = 0; j < attr_keys.length; ++j) {
2465                                         k = attr_keys[j]
2466                                         ret += " " + k
2467                                         if (n.attrs[k].length > 0) {
2468                                                 ret += "=\"" + (enc_attr(n.attrs[k])) + "\""
2469                                         }
2470                                 }
2471                                 ret += '>'
2472                                 if (void_elements[n.name] == null) {
2473                                         if (inner_flags.block) {
2474                                                 next_indent = indent + '    '
2475                                         } else {
2476                                                 next_indent = indent
2477                                         }
2478                                         if (n.children.length) {
2479                                                 ret += this.pretty_html(n.children, next_indent, inner_flags)
2480                                         }
2481                                         ret += "</" + n.name + ">"
2482                                 }
2483                                 break
2484                         case 'text':
2485                                 if (n.parent != null ? plaintext_elements[n.parent.name] : false) {
2486                                         ret += n.text
2487                                 } else if (n.parent != null ? newline_eating_elements[n.parent.name] && n.text.charAt(0) === "\n" : false) {
2488                                         ret += enc_text("\n" + n.text)
2489                                 } else {
2490                                         ret += enc_text(n.text)
2491                                 }
2492                                 break
2493                         case 'comment':
2494                                 ret += "<!--" + n.text + "-->" // TODO encode?
2495                                 break
2496                         case 'doctype':
2497                                 ret += "<!DOCTYPE " + n.name
2498                                 if ((n.public_identifier != null) && n.public_identifier.length > 0) {
2499                                         ret += " \"" + n.public_identifier + "\""
2500                                 }
2501                                 if ((n.system_identifier != null) && n.system_identifier.length > 0) {
2502                                         ret += " \"" + n.system_identifier + "\""
2503                                 }
2504                                 ret += ">"
2505                 }
2506                 want_nl = true
2507                 if (in_flow) {
2508                         prev_in_flow_is_text = is_text
2509                         prev_in_flow_is_block = is_block || (in_flow && is_br)
2510                 }
2511         }
2512         if (tree.length) {
2513                 // output final newline if allowed
2514                 if (!parent_flags.pre_ish) {
2515                         if (prev_in_flow_is_block || parent_flags.block) {
2516                                 ret += "\n" + (indent.substr(4))
2517                         }
2518                 }
2519         }
2520         return ret
2521 }
2522 PeachHTML5Editor.prototype.onblur = function() {
2523         this.editor_is_focused = false
2524         this.kill_cursor()
2525 }
2526 PeachHTML5Editor.prototype.have_focus = function() {
2527         if (!this.editor_is_focused) {
2528                 this.input_el.focus()
2529                 this.editor_is_focused = true
2530         }
2531 }
2532
2533 window.peach_html5_editor = function() {
2534         // coffeescript: return new PeachHTML5Editor args...
2535         // compiles to below... there must be a better way
2536         var args
2537         args = 1 <= arguments.length ? slice.call(arguments, 0) : []
2538         return (function(func, args, ctor) {
2539                 ctor.prototype = func.prototype
2540                 var child = new ctor, result = func.apply(child, args)
2541                 return Object(result) === result ? result : child
2542         })(PeachHTML5Editor, args, function(){})
2543 }
2544
2545 }).call(this)
2546
2547 // test in browser: peach_html5_editor(document.getElementsByTagName('textarea')[0])