editor.coffee

   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 # SETTINGS
  18 overlay_padding = 10
  19 breathing_room = 30 # minimum pixels above/below cursor (scrolling)
  20
  21 timeout = (ms, cb) -> return setTimeout cb, ms
  22 next_frame = (cb) ->
  23         if (window.requestAnimationFrame?)
  24                 window.requestAnimationFrame cb
  25         else
  26                 timeout 16, cb
  27
  28 this_url_sans_path = ->
  29         ret = "#{window.location.href}"
  30         clip = ret.lastIndexOf '#'
  31         if clip > -1
  32                 ret = ret.substr 0, clip
  33         clip = ret.lastIndexOf '?'
  34         if clip > -1
  35                 ret = ret.substr 0, clip
  36         clip = ret.lastIndexOf '/'
  37         if clip > -1
  38                 ret = ret.substr 0, clip + 1
  39         return ret
  40
  41 # table too look up the properties of various values for css's white-space
  42 ws_props =
  43         normal:
  44                 space: false            # spaces are not preserved/rendered
  45                 newline: false          # newlines are not preserved/rendered
  46                 wrap: true              # text is word-wrapped
  47                 to_preserve: 'pre-wrap' # to preservespaces, change white-space to this
  48         nowrap:
  49                 space: false
  50                 newline: false
  51                 wrap: false
  52                 to_preserve: 'pre'
  53         'pre-line':
  54                 space: false
  55                 newline: true
  56                 wrap: true
  57                 to_preserve: 'pre-wrap'
  58         pre:
  59                 space: true
  60                 newline: true
  61                 wrap: false
  62                 to_collapse: 'nowrap'
  63         'pre-wrap':
  64                 space: true
  65                 newline: true
  66                 wrap: true
  67                 to_collapse: 'normal'
  68
  69 # xml 1.0 spec, chromium and firefox accept these, plus lots of unicode chars
  70 valid_attr_regex = new RegExp '^[a-zA-Z_:][-a-zA-Z0-9_:.]*$'
  71 # html5 spec is much more lax, but chromium won't let me make at attribute with the name "4"
  72 js_attr_regex = new RegExp '^[oO][nN].'
  73 # html5 spec says that only these characters are collapsable
  74 multi_sp_regex = new RegExp '[\u0020\u0009\u000a\u000c\u000d][\u0020\u0009\u000a\u000c\u000d]'
  75
  76 str_has_ws_run = (str) ->
  77         return multi_sp_regex.test str
  78
  79 # text nodes don't have getBoundingClientRect(), so use selection api to find
  80 # it.
  81 get_el_bounds = window.bounds = (el) ->
  82         if el.getBoundingClientRect?
  83                 rect = el.getBoundingClientRect()
  84         else
  85                 # text nodes don't have getBoundingClientRect(), so use range api
  86                 range = el.ownerDocument.createRange()
  87                 range.selectNodeContents el
  88                 rect = range.getBoundingClientRect()
  89         doc = el.ownerDocument.documentElement
  90         win = el.ownerDocument.defaultView
  91         y_fix = win.pageYOffset - doc.clientTop
  92         x_fix = win.pageXOffset - doc.clientLeft
  93         return {
  94                 x: rect.left + x_fix
  95                 y: rect.top + y_fix
  96                 w: rect.width ? (rect.right - rect.left)
  97                 h: rect.height ? (rect.top - rect.bottom)
  98         }
  99
 100 is_display_block = (el) ->
 101         if el.currentStyle?
 102                 return el.currentStyle.display is 'block'
 103         else
 104                 return window.getComputedStyle(el, null).getPropertyValue('display') is 'block'
 105
 106 # Pass return value from dom event handlers to this.
 107 # If they return false, this will addinionally stop propagation and default.
 108 event_return = (e, bool) ->
 109         if bool is false
 110                 if e.stopPropagation?
 111                         e.stopPropagation()
 112                 if e.preventDefault?
 113                         e.preventDefault()
 114         return bool
 115 # Warning: currently assumes you're asking about a single character
 116 # Note: chromium returns multiple bounding rects for a space at a line-break
 117 # Note: chromium's getBoundingClientRect() is broken (when zero-area client rects)
 118 # Note: sometimes returns null (eg for whitespace that is not visible)
 119 text_range_bounds = (el, start, end) ->
 120         range = document.createRange()
 121         range.setStart el, start
 122         range.setEnd el, end
 123         rects = range.getClientRects()
 124         if rects.length > 0
 125                 if rects.length > 1
 126                         if rects[1].width > rects[0].width
 127                                 rect = rects[1]
 128                         else
 129                                 rect = rects[0]
 130                 else
 131                         rect = rects[0]
 132         else
 133                 return null
 134         doc = el.ownerDocument.documentElement
 135         win = el.ownerDocument.defaultView
 136         y_fix = win.pageYOffset - doc.clientTop
 137         x_fix = win.pageXOffset - doc.clientLeft
 138         return {
 139                 x: rect.left + x_fix
 140                 y: rect.top + y_fix
 141                 w: rect.width ? (rect.right - rect.left)
 142                 h: rect.height ? (rect.top - rect.bottom)
 143                 rects: rects
 144                 bounding: range.getBoundingClientRect()
 145         }
 146
 147 class CursorPosition
 148         constructor: (args) ->
 149                 @n = args.n ? null
 150                 @i = args.i ? null
 151                 if args.x?
 152                         @x = args.x
 153                         @y = args.y
 154                         @h = args.h
 155                 else
 156                         @set_xyh()
 157                 return
 158         set_xyh: ->
 159                 range = document.createRange()
 160                 if @n.text.length is 0
 161                         ret = text_range_bounds @n.el, 0, 0
 162                 else if @i is @n.text.length
 163                         ret = text_range_bounds @n.el, @i - 1, @i
 164                         if ret?
 165                                 ret.x += ret.w
 166                 else
 167                         ret = text_range_bounds @n.el, @i, @i + 1
 168                 if ret?
 169                         @x = ret.x
 170                         @y = ret.y
 171                         @h = ret.h
 172                 else
 173                         @x = null
 174                         @y = null
 175                         @h = null
 176                 return ret
 177
 178 new_cursor_position = (args) ->
 179         ret = new CursorPosition args
 180         if ret.x?
 181                 return ret
 182         return null
 183
 184 # encode text so it can be safely placed inside an html attribute
 185 enc_attr_regex = new RegExp '(&)|(")|(\u00A0)', 'g'
 186 enc_attr = (txt) ->
 187         return txt.replace enc_attr_regex, (match, amp, quote) ->
 188                 return '&amp;' if (amp)
 189                 return '&quot;' if (quote)
 190                 return '&nbsp;'
 191 enc_text_regex = new RegExp '(&)|(<)|(\u00A0)', 'g'
 192 enc_text = (txt) ->
 193         return txt.replace enc_text_regex, (match, amp, lt) ->
 194                 return '&amp;' if (amp)
 195                 return '&lt;' if (lt)
 196                 return '&nbsp;'
 197
 198 void_elements = {
 199         area: true
 200         base: true
 201         br: true
 202         col: true
 203         embed: true
 204         hr: true
 205         img: true
 206         input: true
 207         keygen: true
 208         link: true
 209         meta: true
 210         param: true
 211         source: true
 212         track: true
 213         wbr: true
 214 }
 215 # TODO make these always pretty-print (on the inside) like blocks
 216 no_text_elements = { # these elements never contain text
 217         select: true
 218         table: true
 219         tr: true
 220         thead: true
 221         tbody: true
 222         ul: true
 223         ol: true
 224 }
 225
 226 domify = (doc, hash) ->
 227         for tag, attrs of hash
 228                 if tag is 'text'
 229                         return document.createTextNode attrs
 230                 el = document.createElement tag
 231                 for k, v of attrs
 232                         if k is 'children'
 233                                 for child in v
 234                                         el.appendChild child
 235                         else
 236                                 el.setAttribute k, v
 237         return el
 238
 239
 240
 241 ignore_key_codes =
 242         '18': true # alt
 243         '20': true # capslock
 244         '17': true # ctrl
 245         '144': true # numlock
 246         '16': true # shift
 247         '91': true # windows "start" key
 248 # key codes: (valid on keydown, not keypress)
 249 KEY_LEFT = 37
 250 KEY_UP = 38
 251 KEY_RIGHT = 39
 252 KEY_DOWN = 40
 253 KEY_BACKSPACE = 8 # <--
 254 KEY_DELETE = 46 # -->
 255 KEY_END = 35
 256 KEY_ENTER = 13
 257 KEY_ESCAPE = 27
 258 KEY_HOME = 36
 259 KEY_INSERT = 45
 260 KEY_PAGE_UP = 33
 261 KEY_PAGE_DOWN = 34
 262 KEY_TAB = 9
 263 control_key_codes = # we react to these, but they aren't typing
 264         '37': KEY_LEFT
 265         '38': KEY_UP
 266         '39': KEY_RIGHT
 267         '40': KEY_DOWN
 268         '35': KEY_END
 269         '8':  KEY_BACKSPACE
 270         '46': KEY_DELETE
 271         '13': KEY_ENTER
 272         '27': KEY_ESCAPE
 273         '36': KEY_HOME
 274         '45': KEY_INSERT
 275         '33': KEY_PAGE_UP
 276         '34': KEY_PAGE_DOWN
 277         '9':  KEY_TAB
 278
 279 instantiate_tree = (tree, parent) ->
 280         remove = []
 281         for c, i in tree
 282                 switch c.type
 283                         when 'text'
 284                                 c.el = parent.ownerDocument.createTextNode c.text
 285                                 parent.appendChild c.el
 286                         when 'tag'
 287                                 if c.name in ['script', 'object', 'iframe', 'link']
 288                                         # TODO put placeholders instead
 289                                         remove.unshift i
 290                                         continue
 291                                 # TODO create in correct namespace
 292                                 c.el = parent.ownerDocument.createElement c.name
 293                                 for k, v of c.attrs
 294                                         # FIXME if attr_whitelist[k]?
 295                                         if valid_attr_regex.test k
 296                                                 unless js_attr_regex.test k
 297                                                         c.el.setAttribute k, v
 298                                 parent.appendChild c.el
 299                                 if c.children.length
 300                                         instantiate_tree c.children, c.el
 301         for i in remove
 302                 tree.splice i, 1
 303
 304 traverse_tree = (tree, cb) ->
 305         done = false
 306         for c in tree
 307                 done = cb c
 308                 return done if done
 309                 if c.children.length
 310                         done = traverse_tree c.children, cb
 311                         return done if done
 312         return done
 313
 314 first_cursor_position = (tree) ->
 315         found = null
 316         traverse_tree tree, (node, state) ->
 317                 if node.type is 'text'
 318                         cursor = new_cursor_position n: node, i: 0
 319                         if cursor?
 320                                 found = cursor
 321                                 return true # done traversing
 322                 return false # not done traversing
 323         return found # maybe null
 324
 325 # this will fail when text has non-locatable cursor positions
 326 find_next_cursor_position = (tree, cursor) ->
 327         if cursor.n.type is 'text' and cursor.n.text.length > cursor.i
 328                 new_cursor = new_cursor_position n: cursor.n, i: cursor.i + 1
 329                 if new_cursor?
 330                         return new_cursor
 331         state_before = true
 332         found = null
 333         traverse_tree tree, (node, state) ->
 334                 if node.type is 'text' and state_before is false
 335                         new_cursor = new_cursor_position n: node, i: 0
 336                         if new_cursor?
 337                                 found = new_cursor
 338                                 return true # done traversing
 339                 if node is cursor.n
 340                         state_before = false
 341                 return false # not done traversing
 342         if found?
 343                 return found
 344         return null
 345
 346 last_cursor_position = (tree) ->
 347         found = null
 348         traverse_tree tree, (node) ->
 349                 if node.type is 'text'
 350                         cursor = new_cursor_position n: node, i: node.text.length
 351                         if cursor?
 352                                 found = cursor
 353                 return false # not done traversing
 354         return found # maybe null
 355
 356 # this will fail when text has non-locatable cursor positions
 357 find_prev_cursor_position = (tree, cursor) ->
 358         if cursor.n.type is 'text' and cursor.i > 0
 359                 new_cursor = new_cursor_position n: cursor.n, i: cursor.i - 1
 360                 if new_cursor?
 361                         return new_cursor
 362         found_prev = null
 363         found = null
 364         traverse_tree tree, (node) ->
 365                 if node is cursor.n
 366                         found = found_prev # maybe null
 367                         return true # done traversing
 368                 if node.type is 'text'
 369                         new_cursor = new_cursor_position n: node, i: node.text.length
 370                         if new_cursor?
 371                                 found_prev = new_cursor
 372                 return false # not done traversing
 373         return found # maybe null
 374
 375 find_up_cursor_position = (tree, cursor, ideal_x) ->
 376         new_cursor = cursor
 377         # go prev until we're higher on y axis
 378         while new_cursor.y >= cursor.y
 379                 new_cursor = find_prev_cursor_position tree, new_cursor
 380                 return null unless new_cursor?
 381         # done early if we're already left of old cursor position
 382         if new_cursor.x <= ideal_x
 383                 return new_cursor
 384         target_y = new_cursor.y
 385         # search leftward, until we find the closest position
 386         # new_cursor is the prev-most position we've checked
 387         # prev_cursor is the older value, so it's not as prev as new_cursor
 388         while new_cursor.x > ideal_x and new_cursor.y is target_y
 389                 prev_cursor = new_cursor
 390                 new_cursor = find_prev_cursor_position tree, new_cursor
 391                 break unless new_cursor?
 392         # move cursor to prev_cursor or new_cursor
 393         if new_cursor?
 394                 if new_cursor.y is target_y
 395                         # both valid, and on the same line, use closest
 396                         if (ideal_x - new_cursor.x) < (prev_cursor.x - ideal_x)
 397                                 return new_cursor
 398                         else
 399                                 return prev_cursor
 400                 else
 401                         # new_cursor on wrong line, use prev_cursor
 402                         return prev_cursor
 403         else
 404                 # can't go any further prev, use prev_cursor
 405                 return prev_cursor
 406
 407 find_down_cursor_position = (tree, cursor, ideal_x) ->
 408         new_cursor = cursor
 409         # go next until we move on the y axis
 410         while new_cursor.y <= cursor.y
 411                 new_cursor = find_next_cursor_position tree, new_cursor
 412                 return null unless new_cursor?
 413         # done early if we're already right of old cursor position
 414         if new_cursor.x >= ideal_x
 415                 # this would be strange, but could happen due to runaround
 416                 return new_cursor
 417         target_y = new_cursor.y
 418         # search rightward, until we find the closest position
 419         # new_cursor is the next-most position we've checked
 420         # prev_cursor is the older value, so it's not as next as new_cursor
 421         while new_cursor.x < ideal_x and new_cursor.y is target_y
 422                 prev_cursor = new_cursor
 423                 new_cursor = find_next_cursor_position tree, new_cursor
 424                 break unless new_cursor?
 425         # move cursor to prev_cursor or new_cursor
 426         if new_cursor?
 427                 if new_cursor.y is target_y
 428                         # both valid, and on the same line, use closest
 429                         if (new_cursor.x - ideal_x) < (ideal_x - prev_cursor.x)
 430                                 return new_cursor
 431                         else
 432                                 return prev_cursor
 433                 else
 434                         # new_cursor on wrong line, use prev_cursor
 435                         return prev_cursor
 436         else
 437                 # can't go any further prev, use prev_cursor
 438                 return prev_cursor
 439
 440 xy_to_cursor = (tree, xy) ->
 441         for n in tree
 442                 if n.type is 'tag' or n.type is 'text'
 443                         bounds = get_el_bounds n.el
 444                         continue if xy.x < bounds.x
 445                         continue if xy.x > bounds.x + bounds.w
 446                         continue if xy.y < bounds.y
 447                         continue if xy.y > bounds.y + bounds.h
 448                         if n.children.length
 449                                 ret = xy_to_cursor n.children, xy
 450                                 return ret if ret?
 451                         if n.type is 'text'
 452                                 # click is within bounding box that contains all text.
 453                                 if n.text.length is 0
 454                                         ret = new_cursor_position n: n, i: 0
 455                                         return ret if ret?
 456                                         continue
 457                                 before = new_cursor_position n: n, i: 0
 458                                 continue unless before?
 459                                 after = new_cursor_position n: n, i: n.text.length
 460                                 continue unless after?
 461                                 if xy.y < before.y + before.h and xy.x < before.x
 462                                         # console.log 'before first char on first line'
 463                                         continue
 464                                 if xy.y > after.y and xy.x > after.x
 465                                         # console.log 'after last char on last line'
 466                                         continue
 467                                 if xy.y < before.y
 468                                         console.log "Warning: click in text bounding box but above first line"
 469                                         continue # above first line (runaround?)
 470                                 if xy.y > after.y + after.h
 471                                         console.log "Warning: click in text bounding box but below last line", xy.y, after.y, after.h
 472                                         continue # below last line (shouldn't happen?)
 473                                 while after.i - before.i > 1
 474                                         guess_i = Math.round((before.i + after.i) / 2)
 475                                         cur = new_cursor_position n: n, i: guess_i
 476                                         unless cur?
 477                                                 console.log "error: failed to find cursor pixel location for", n, guess_i
 478                                                 before = null
 479                                                 break
 480                                         if xy.y < cur.y or (xy.y <= cur.y + cur.h and xy.x < cur.x)
 481                                                 after = cur
 482                                         else
 483                                                 before = cur
 484                                 continue unless before? # signals failure to find a cursor position
 485                                 # which one is closest?
 486                                 if Math.abs(before.x - xy.x) < Math.abs(after.x - xy.x)
 487                                         return before
 488                                 else
 489                                         return after
 490         return null
 491
 492 # browsers collapse these (html5 spec calls these "space characters")
 493 is_space_code = (char_code) ->
 494         switch char_code
 495                 when 9, 10, 12, 13, 32
 496                         return true
 497         return false
 498 is_space = (chr) ->
 499         return is_space_code chr.charCodeAt 0
 500
 501 tree_remove_empty_text_nodes = (tree) ->
 502         empties = []
 503         traverse_tree tree, (n) ->
 504                 if n.type is 'text'
 505                         if n.text.length is 0
 506                                 empties.unshift n
 507                 return false # not done traversing
 508         for n in empties
 509                 # don't completely empty the tree
 510                 if tree.length is 1
 511                         if tree[0].type is 'text'
 512                                 console.log "oop, leaving a blank node because it's the only thing"
 513                                 return
 514                 n.el.parentNode.removeChild n.el
 515                 for c, i in n.parent.children
 516                         if c is n
 517                                 n.parent.children.splice i, 1
 518                                 break
 519
 520 # remove whitespace that would be trimmed
 521 # replace whitespace that would collapse with a single space
 522 # FIXME delete this, use @collapse_whitespace instead
 523 collapse_whitespace = (tree) ->
 524         prev = cur = next = null
 525         prev_i = cur_i = next_i = 0
 526         prev_pos = pos = next_pos = null
 527         prev_px = cur_px = next_px = null
 528         first = true
 529         removed_char = null
 530
 531         tree_remove_empty_text_nodes(tree)
 532
 533         iterate = (tree, cb) ->
 534                 for n in tree
 535                         if n.type is 'text'
 536                                 i = 0
 537                                 while i < n.text.length # don't foreach, cb might remove chars
 538                                         advance = cb n, i
 539                                         if advance
 540                                                 i += 1
 541                         if n.type is 'tag'
 542                                 block = is_display_block n.el
 543                                 if block
 544                                         cb null
 545                                 if n.children.length > 0
 546                                         iterate n.children, cb
 547                                 if block
 548                                         cb null
 549         # remove cur char
 550         remove = (undo) ->
 551                 if undo
 552                         cur.el.textContent = cur.text = (cur.text.substr 0, cur_i) + removed_char + (cur.text.substr cur_i)
 553                         if next is cur # in same text node
 554                                 next_i += 1
 555                         return -1
 556                 else
 557                         removed_char = cur.text.charAt(cur_i)
 558                         cur.el.textContent = cur.text = (cur.text.substr 0, cur_i) + (cur.text.substr cur_i + 1)
 559                         if next is cur # in same text node
 560                                 if next_i is 0
 561                                         throw "how is this possible?"
 562                                 next_i -= 1
 563                         return 1
 564         replace_with_space = (undo) ->
 565                 if undo
 566                         cur.text = (cur.text.substr 0, cur_i) + removed_char + (cur.text.substr cur_i + 1)
 567                         cur.el.textContent = cur.text
 568                 else
 569                         removed_char = cur.text.charAt(cur_i)
 570                         if removed_char isnt ' '
 571                                 cur.text = (cur.text.substr 0, cur_i) + ' ' + (cur.text.substr cur_i + 1)
 572                                 cur.el.textContent = cur.text
 573                 return 0
 574         # return true if cur was removed from the dom (ie re-use same prev)
 575         operate = ->
 576                 # cur definitately set
 577                 # prev and/or next might be null, indicating the start/end of a display:block
 578                 return false unless is_space_code cur.text.charCodeAt cur_i
 579                 fixers = [remove, replace_with_space]
 580                 # check for common case: single whitespace surrounded by non-whitespace chars
 581                 if prev? and next?
 582                         unless (is_space_code prev.text.charCodeAt prev_i) or (is_space_code next.text.charCodeAt next_i)
 583                                 dbg = cur.text.charCodeAt cur_i
 584                                 if cur.text.charAt(cur_i) is ' ' # perens required
 585                                         # single space can't collapse, doesn't need fixin'
 586                                         return false
 587                                 else
 588                                         # tab, newline, etc, can't collapse, but maybe should be replaced
 589                                         fixers = [replace_with_space]
 590                 bounds = text_range_bounds cur.el, cur_i, cur_i + 1
 591                 # consistent cases:
 592                 # 1. zero rects returned by getClientRects() means collapsed space
 593                 if bounds is null
 594                         return remove()
 595                 # 2. width greater than zero means visible space
 596                 if bounds.w > 0
 597                         # has bounds, don't try removing
 598                         fixers = [replace_with_space]
 599                 # now the weird edge cases...
 600                 #
 601                 # firefox and chromium both report zero width for characters at the end
 602                 # of a line where the text wraps (automatically, due to word-wrap) to
 603                 # the next line. These do not appear to be distinguishable from
 604                 # collapsed spaces via the range/bounds api, so...
 605                 #
 606                 # remove it from the dom, and if prev or next moves, put it back.
 607                 #
 608                 # this block (try changing it, put it back if something moves) is also
 609                 # used on collapsable whitespace characters besides space. In this case
 610                 # the character is replaced with a normal space character instead of
 611                 # removed
 612                 if prev? and not prev_px?
 613                         prev_px = new_cursor_position n: prev, i: prev_i
 614                 if next? and not next_px?
 615                         next_px = new_cursor_position n: next, i: next_i
 616                 #if prev is null and next is null
 617                 #       parent_px = cur.parent.el.getBoundingClientRect()
 618                 undo_arg = true # just for readabality
 619                 removed = 0
 620                 for fixer in fixers
 621                         break if removed > 0
 622                         removed += fixer()
 623                         need_undo = false
 624                         if prev?
 625                                 if prev_px?
 626                                         new_prev_px = new_cursor_position n: prev, i: prev_i
 627                                         if new_prev_px?
 628                                                 if new_prev_px.x isnt prev_px.x or new_prev_px.y isnt prev_px.y
 629                                                         need_undo = true
 630                                         else
 631                                                 need_undo = true
 632                                 else
 633                                         console.log "this shouldn't happen, we remove spaces that don't locate"
 634                         if next? and not need_undo
 635                                 if next_px?
 636                                         new_next_px = new_cursor_position n: next, i: next_i
 637                                         if new_next_px?
 638                                                 if new_next_px.x isnt next_px.x or new_next_px.y isnt next_px.y
 639                                                         need_undo = true
 640                                         else
 641                                                 need_undo = true
 642                                 #else
 643                                 #       console.log "removing space becase space after it is collapsed"
 644                         if need_undo
 645                                 removed += fixer undo_arg
 646                 if removed > 0
 647                         return true
 648                 else
 649                         return false
 650         # pass null at start/end of display:block
 651         queue = (n, i) ->
 652                 next = n
 653                 next_i = i
 654                 next_px = null
 655                 advance = true
 656                 if cur?
 657                         removed = operate()
 658                         # don't advance (to the next character next time) if we removed a
 659                         # character from the same text node as ``next``, because doing so
 660                         # renumbers the indexes in that string
 661                         if removed and cur is next
 662                                 advance = false
 663                 else
 664                         removed = false
 665                 unless removed
 666                         prev = cur
 667                         prev_i = cur_i
 668                         prev_px = cur_px
 669                 cur = next
 670                 cur_i = next_i
 671                 cur_px = next_px
 672                 return advance
 673         queue null
 674         iterate tree, queue
 675         queue null
 676
 677         tree_remove_empty_text_nodes(tree)
 678
 679 class PeachHTML5Editor
 680         # Options: (all optional)
 681         #   editor_id: "id" attribute for outer-most element created by/for editor
 682         #   css_file: filename of a css file to style editable content
 683         #   on_init: callback for when the editable content is in place
 684         constructor: (in_el, options) ->
 685                 @options = options ? {}
 686                 @in_el = in_el
 687                 @tree = null # array of Nodes, all editable content
 688                 @tree_parent = null # @tree is this.children. .el might === @idoc.body
 689                 @matting = []
 690                 @init_1_called = false # when iframes have loaded
 691                 @outer_iframe # iframe to hold editor
 692                 @outer_idoc # "document" object for @outer_iframe
 693                 @wrap2 = null # scrollbar is on this
 694                 @wrap2_offset = null
 695                 @wrap2_height = null # including padding
 696                 @iframe = null # iframe to hold editable content
 697                 @idoc = null # "document" object for @iframe
 698                 @cursor = null
 699                 @cursor_el = null
 700                 @cursor_visible = false
 701                 @cursor_ideal_x = null
 702                 @poll_for_blur_timeout = null
 703                 opt_fragment = @options.fragment ? true
 704                 @parser_opts = {}
 705                 if opt_fragment
 706                         @parser_opts.fragment = 'body'
 707
 708                 @outer_iframe = domify document, iframe: {}
 709                 outer_iframe_style = 'border: none !important; margin: 0 !important; padding: 0 !important; height: 100% !important; width: 100% !important;'
 710                 if @options.editor_id?
 711                         @outer_iframe.setAttribute 'id', @options.editor_id
 712                 @outer_iframe.onload = =>
 713                         @outer_idoc = @outer_iframe.contentDocument
 714                         icss = domify @outer_idoc, style: children: [
 715                                 domify @outer_idoc, text: css
 716                         ]
 717                         @outer_idoc.head.appendChild icss
 718                         @iframe = domify @outer_idoc, iframe: sandbox: 'allow-same-origin allow-scripts'
 719                         @iframe.onload = =>
 720                                 @init_1()
 721                         timeout 200, => # firefox never fires this onload
 722                                 @init_1() unless @init_1_called
 723                         @outer_idoc.body.appendChild(
 724                                 domify @outer_idoc, div: id: 'wrap1', children: [
 725                                         domify @outer_idoc, div: style: "position: absolute; top: 0; left: 1px; font-size: 10px", children: [ domify @outer_idoc, text: "Peach HTML5 Editor" ]
 726                                         @wrap2 = domify @outer_idoc, div: id: 'wrap2', children: [
 727                                                 domify @outer_idoc, div: id: 'wrap3', children: [
 728                                                         @iframe
 729                                                         @overlay = domify @outer_idoc, div: id: 'overlay'
 730                                                 ]
 731                                         ]
 732                                 ]
 733                         )
 734                 outer_wrap = domify document, div: class: 'peach_html5_editor'
 735                 @in_el.parentNode.appendChild outer_wrap
 736                 outer_bounds = get_el_bounds outer_wrap
 737                 if outer_bounds.w < 300
 738                         outer_bounds.w = 300
 739                 if outer_bounds.h < 300
 740                         outer_bounds.h = 300
 741                 outer_iframe_style += "width: #{outer_bounds.w}px; height: #{outer_bounds.h}px;"
 742                 @outer_iframe.setAttribute 'style', outer_iframe_style
 743                 css = @generate_outer_css w: outer_bounds.w, h: outer_bounds.h
 744                 outer_wrap.appendChild @outer_iframe
 745         init_1: -> # @iframe has loaded (but not it's css)
 746                 @idoc = @iframe.contentDocument
 747                 @init_1_called = true
 748                 # chromium doesn't resolve relative urls as though they were at the same domain
 749                 # so add a <base> tag
 750                 @idoc.head.appendChild domify @idoc, base: href: this_url_sans_path()
 751                 # don't let @iframe have scrollbars
 752                 @idoc.head.appendChild domify @idoc, style: children: [domify @idoc, text: "body { overflow: hidden; }"]
 753                 # load css file
 754                 if @options.css_file
 755                         istyle = domify @idoc, link: rel: 'stylesheet', href: @options.css_file
 756                         istyle.onload = =>
 757                                 @init_2()
 758                         @idoc.head.appendChild istyle
 759                 else
 760                         @init_2()
 761         init_2: -> # @iframe and it's css file(s) are ready
 762                 @overlay.onclick = (e) =>
 763                         @have_focus()
 764                         return event_return e, @onclick e
 765                 @overlay.ondoubleclick = (e) =>
 766                         @have_focus()
 767                         return event_return e, @ondoubleclick e
 768                 @outer_idoc.body.onkeyup = (e) =>
 769                         @have_focus()
 770                         return event_return e, @onkeyup e
 771                 @outer_idoc.body.onkeydown = (e) =>
 772                         @have_focus()
 773                         return event_return e, @onkeydown e
 774                 @outer_idoc.body.onkeypress = (e) =>
 775                         @have_focus()
 776                         return event_return e, @onkeypress e
 777                 @load_html @in_el.value
 778                 if @options.on_init?
 779                         @options.on_init()
 780         generate_outer_css: (args) ->
 781                 w = args.w ? 300
 782                 h = args.h ? 300
 783                 inner_padding = args.inner_padding ? overlay_padding
 784                 frame_width = args.frame_width ? inner_padding
 785                 occupy = (left, top = left, right = left, bottom = top) ->
 786                         w -= left + right
 787                         h -= top + bottom
 788                         return Math.max(left, top, right, bottom)
 789                 ret = ''
 790                 ret += 'body {'
 791                 ret +=     'margin: 0;'
 792                 ret +=     'padding: 0;'
 793                 ret +=     'color: black;'
 794                 ret +=     'background: white;'
 795                 ret += '}'
 796                 ret += '#wrap1 {'
 797                 ret +=     "border: #{occupy 1}px solid black;"
 798                 ret +=     "padding: #{occupy frame_width}px;"
 799                 ret += '}'
 800                 ret += '#wrap2 {'
 801                 ret +=     "border: #{occupy 1}px solid black;"
 802                 @wrap2_height = h # including padding because padding scrolls
 803                 ret +=     "padding: #{occupy inner_padding}px;"
 804                 ret +=     "padding-right: #{inner_padding + occupy 0, 0, 15, 0}px;" # for scroll bar
 805                 ret +=     "width: #{w}px;"
 806                 ret +=     "height: #{h}px;"
 807                 ret +=     'overflow-x: hidden;'
 808                 ret +=     'overflow-y: scroll;'
 809                 ret += '}'
 810                 ret += '#wrap3 {'
 811                 ret +=     'position: relative;'
 812                 ret +=     "width: #{w}px;"
 813                 ret +=     "min-height: #{h}px;"
 814                 ret += '}'
 815                 ret += 'iframe {'
 816                 ret +=     'box-sizing: border-box;'
 817                 ret +=     'margin: 0;'
 818                 ret +=     'border: none;'
 819                 ret +=     'padding: 0;'
 820                 ret +=     "width: #{w}px;"
 821                 #ret +=     "height: #{h}px;" # height auto-set when content set/changed
 822                 ret +=     '-ms-user-select: none;'
 823                 ret +=     '-webkit-user-select: none;'
 824                 ret +=     '-moz-user-select: none;'
 825                 ret +=     'user-select: none;'
 826                 ret += '}'
 827                 ret += '#overlay {'
 828                 ret +=     'position: absolute;'
 829                 ret +=     "left: -#{inner_padding}px;"
 830                 ret +=     "top: -#{inner_padding}px;"
 831                 ret +=     "right: -#{inner_padding}px;"
 832                 ret +=     "bottom: -#{inner_padding}px;"
 833                 ret +=     'overflow: hidden;'
 834                 ret += '}'
 835                 ret += '.lightbox {'
 836                 ret +=     'position: absolute;'
 837                 ret +=     'background: rgba(100,100,100,0.2);'
 838                 ret += '}'
 839                 ret += '#cursor {'
 840                 ret +=     'position: absolute;'
 841                 ret +=     'width: 2px;'
 842                 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));'
 843                 ret +=     'background-size: 200% 200%;'
 844                 ret +=     '-webkit-animation: blink 1s linear normal infinite;'
 845                 ret +=     'animation: blink 1s linear normal infinite;'
 846                 ret += '}'
 847                 ret += '@-webkit-keyframes blink {'
 848                 ret +=     '0%{background-position:0% 0%}'
 849                 ret +=     '100%{background-position:0% -100%}'
 850                 ret += '}'
 851                 ret += '@keyframes blink { '
 852                 ret +=     '0%{background-position:0% 0%}'
 853                 ret +=     '100%{background-position:0% -100%}'
 854                 ret += '}'
 855                 ret += '.ann_box {'
 856                 ret +=     'z-index: 5;'
 857                 ret +=     'position: absolute;'
 858                 ret +=     'border: 1px solid rgba(0,0,0,0.1);'
 859                 ret +=     'outline: 1px solid rgba(255,255,255,0.1);' # in case there's a black background
 860                 ret += '}'
 861                 ret += '.ann_tag {'
 862                 ret +=     'z-index: 10;'
 863                 ret +=     'position: absolute;'
 864                 ret +=     'font-size: 8px;'
 865                 ret +=     'white-space: pre;'
 866                 ret +=     'background: rgba(255,255,255,0.4);'
 867                 ret +=     '-ms-user-select: none;'
 868                 ret +=     '-webkit-user-select: none;'
 869                 ret +=     '-moz-user-select: none;'
 870                 ret +=     'user-select: none;'
 871                 ret += '}'
 872                 return ret
 873         overlay_event_to_inner_xy: (e) ->
 874                 unless @wrap2_offset?
 875                         @wrap2_offset = get_el_bounds @wrap2
 876                 x = e.pageX - overlay_padding
 877                 y = e.pageY - overlay_padding + @wrap2.scrollTop
 878                 return x: x - @wrap2_offset.x, y: y - @wrap2_offset.y
 879         onclick: (e) ->
 880                 xy = @overlay_event_to_inner_xy e
 881                 new_cursor = xy_to_cursor @tree, xy
 882                 if new_cursor?
 883                         @move_cursor new_cursor
 884                 else
 885                         @kill_cursor()
 886                 return false
 887         ondoubleclick: (e) ->
 888                 return false
 889         onkeyup: (e) ->
 890                 return if e.ctrlKey
 891                 return false if ignore_key_codes[e.keyCode]?
 892                 #return false if control_key_codes[e.keyCode]?
 893         onkeydown: (e) ->
 894                 return if e.ctrlKey
 895                 return false if ignore_key_codes[e.keyCode]?
 896                 #return false if control_key_codes[e.keyCode]?
 897                 switch e.keyCode
 898                         when KEY_LEFT
 899                                 if @cursor?
 900                                         new_cursor = find_prev_cursor_position @tree, @cursor
 901                                 else
 902                                         new_cursor = first_cursor_position @tree
 903                                 if new_cursor?
 904                                         @move_cursor new_cursor
 905                                 return false
 906                         when KEY_RIGHT
 907                                 if @cursor?
 908                                         new_cursor = find_next_cursor_position @tree, @cursor
 909                                 else
 910                                         new_cursor = last_cursor_position @tree
 911                                 if new_cursor?
 912                                         @move_cursor new_cursor
 913                                 return false
 914                         when KEY_UP
 915                                 if @cursor?
 916                                         new_cursor = find_up_cursor_position @tree, @cursor, @cursor_ideal_x
 917                                         if new_cursor?
 918                                                 saved_ideal_x = @cursor_ideal_x
 919                                                 @move_cursor new_cursor
 920                                                 @cursor_ideal_x = saved_ideal_x
 921                                 else
 922                                         # move cursor to first position in document
 923                                         new_cursor = first_cursor_position @tree
 924                                         if new_cursor?
 925                                                 @move_cursor new_cursor
 926                                 return false
 927                         when KEY_DOWN
 928                                 if @cursor?
 929                                         new_cursor = find_down_cursor_position @tree, @cursor, @cursor_ideal_x
 930                                         if new_cursor?
 931                                                 saved_ideal_x = @cursor_ideal_x
 932                                                 @move_cursor new_cursor
 933                                                 @cursor_ideal_x = saved_ideal_x
 934                                 else
 935                                         # move cursor to first position in document
 936                                         new_cursor = last_cursor_position @tree
 937                                         if new_cursor?
 938                                                 @move_cursor new_cursor
 939                                 return false
 940                         when KEY_END
 941                                 new_cursor = last_cursor_position @tree
 942                                 if new_cursor?
 943                                         @move_cursor new_cursor
 944                                 return false
 945                         when KEY_BACKSPACE
 946                                 @on_key_backspace e
 947                                 return false
 948                         when KEY_DELETE
 949                                 return false unless @cursor?
 950                                 new_cursor = find_next_cursor_position @tree, n: @cursor.n, i: @cursor.i
 951                                 # try moving cursor right and then running backspace code
 952                                 # TODO replace this hack with a real implementation
 953                                 if new_cursor?
 954                                         # try to detect common case where cursor goes inside an block,
 955                                         # but doesn't pass a character (and advance one more in that case)
 956                                         if new_cursor.n isnt @cursor.n and new_cursor.i is 0
 957                                                 if new_cursor.n.type is 'text' and new_cursor.n.text.length > 0
 958                                                         if new_cursor.n.parent?
 959                                                                 unless @is_display_block new_cursor.n.parent
 960                                                                         # FIXME should test run sibling
 961                                                                         new_cursor = new_cursor_position n: new_cursor.n, i: new_cursor.i + 1
 962                                 if new_cursor?
 963                                         if new_cursor.n isnt @cursor.n or new_cursor.i isnt @cursor.i
 964                                                 @move_cursor new_cursor
 965                                                 @on_key_backspace e
 966                                 return false
 967                         when KEY_ENTER
 968                                 @on_key_enter e
 969                                 return false
 970                         when KEY_ESCAPE
 971                                 @kill_cursor()
 972                                 return false
 973                         when KEY_HOME
 974                                 new_cursor = first_cursor_position @tree
 975                                 if new_cursor?
 976                                         @move_cursor new_cursor
 977                                 return false
 978                         when KEY_INSERT
 979                                 return false
 980                         when KEY_PAGE_UP
 981                                 @on_page_up_key e
 982                                 return false
 983                         when KEY_PAGE_DOWN
 984                                 @on_page_down_key e
 985                                 return false
 986                         when KEY_TAB
 987                                 return false
 988         onkeypress: (e) ->
 989                 return if e.ctrlKey
 990                 return false if ignore_key_codes[e.keyCode]?
 991                 char = e.charCode ? e.keyCode
 992                 if char and @cursor?
 993                         char = String.fromCharCode char
 994                         @insert_character @cursor.n, @cursor.i, char
 995                         @text_cleanup @cursor.n
 996                         @changed()
 997                         new_cursor = new_cursor_position n: @cursor.n, i: @cursor.i + 1
 998                         if new_cursor
 999                                 @move_cursor new_cursor
1000                         else
1001                                 console.log "ERROR: couldn't find cursor position after insert"
1002                                 @kill_cursor()
1003                 return false
1004         on_key_enter: (e) -> # enter key pressed
1005                 return unless @cursor_visible
1006                 cur_block = @cursor.n
1007                 loop
1008                         if cur_block.type is 'tag'
1009                                 if is_display_block cur_block.el
1010                                         break
1011                         return unless cur_block.parent?
1012                         cur_block = cur_block.parent
1013                 # find array to insert new element into
1014                 if cur_block.parent is @tree_parent # top-level
1015                         parent_el = @idoc.body
1016                         pc = @tree
1017                 else
1018                         parent_el = cur_block.parent.el
1019                         pc = cur_block.parent.children
1020                 # find index of current block in its parent
1021                 for n, i in pc
1022                         break if n is cur_block
1023                 i += 1 # we want to be after it
1024                 if i < pc.length
1025                         before = pc[i].el
1026                 else
1027                         before = null
1028                 # TODO if content after cursor
1029                 #       TODO new block is empty
1030                 new_text = new peach_parser.Node 'text', text: ' '
1031                 new_node = new peach_parser.Node 'tag', name: 'p', parent: cur_block.parent, attrs: {style: 'white-space: pre-wrap'}, children: [new_text]
1032                 new_text.parent = new_node
1033                 new_text.el = domify @idoc, text: ' '
1034                 new_node.el = domify @idoc, p: style: 'white-space: pre-wrap', children: [new_text.el]
1035                 pc.splice i, 0, new_node
1036                 parent_el.insertBefore new_node.el, before
1037                 @changed()
1038                 new_cursor = new_cursor_position n: new_text, i: 0
1039                 throw 'bork bork' unless new_cursor?
1040                 @move_cursor new_cursor
1041                 # TODO move content past cursor into this new block
1042         # unlike the global function, this takes a Node, not an element
1043         is_display_block: (n) ->
1044                 # TODO stop calling global function, merge it into here, use iframe's window object
1045                 return false unless n.type is 'tag'
1046                 return is_display_block n.el
1047         find_block_parent: (n) ->
1048                 loop
1049                         n = n.parent
1050                         return null unless n?
1051                         return n if @is_display_block n
1052                         return n if n is @tree_parent
1053                 return null
1054         # return a flat array of nodes (text, <br>, and later also inline-block)
1055         # that are flowing/wrapping together. n can be the containing block, or any
1056         # element inside it.
1057         get_text_run: (n) ->
1058                 ret = []
1059                 if @is_display_block n
1060                         block = n
1061                 else
1062                         block = @find_block_parent n
1063                         return ret unless block?
1064                 traverse_tree block.children, (n) =>
1065                         if n.type is 'text'
1066                                 ret.push n
1067                         else if n.type is 'tag'
1068                                 if n.name is 'br'
1069                                         ret.push n
1070                                 else
1071                                         disp = @computed_style n
1072                                         if disp is 'inline-block'
1073                                                 ret.push n
1074                         return false # not done traversing
1075                 return ret
1076         node_is_decendant: (young, old) ->
1077                 while young? and young != @tree_parent
1078                         return true if young is old
1079                         young = young.parent
1080                 return false
1081         # helper for on_key_backspace
1082         _merge_left: (state) ->
1083                 # the node prev to n was not prev to it a moment ago, merge with it if reasonable
1084                 pi = state.n.parent.children.indexOf(state.n)
1085                 if pi > 0
1086                         prev = state.n.parent.children[pi - 1]
1087                         if prev.type is 'text'
1088                                 state.i = prev.text.length
1089                                 prev.text = prev.el.textContent = prev.text + state.n.text
1090                                 @remove_node state.n
1091                                 state.n = prev
1092                                 state.changed = true
1093                                 state.moved_cursor = true
1094                 # else # TODO merge possible consecutive matching inline tags at @cursor
1095                 return state
1096         # helper for on_key_backspace
1097         # remove n from the dom, also remove its inline parents that are emptied by removing n
1098         _backspace_node_helper: (n, run = @get_text_run(n), run_i = run.indexOf(n)) ->
1099                 block = @find_block_parent n
1100                 # delete text node
1101                 @remove_node n
1102                 # delete any inline parents
1103                 n = n.parent
1104                 while n? and n isnt block
1105                         # bail if the previous node in this run is also inside the same parent
1106                         if run_i > 0
1107                                 break if @node_is_decendant run[run_i - 1], n
1108                         # bail if the next node in this run is also inside the same parent
1109                         if run_i + 1 < run.length
1110                                 break if @node_is_decendant run[run_i + 1], n
1111                         # move any sibling nodes to parent. These nodes are not in the text run
1112                         while n.children.length > 0
1113                                 @move_node n.children[0], n.parent, n
1114                         # remove (now completely empty) inline parent
1115                         @remove_node n
1116                         # proceed to outer parent
1117                         n = n.parent
1118                 return
1119         on_key_backspace: (e) ->
1120                 return unless @cursor?
1121                 new_cursor = null
1122                 run = null
1123                 changed = true
1124                 if @cursor.i is 0 # cursor is at start of text node
1125                         run ?= @get_text_run @cursor.n
1126                         run_i = run.indexOf(@cursor.n)
1127                         if run_i is 0 # if at start of text run
1128                                 block = @find_block_parent @cursor.n
1129                                 prev_cursor = find_prev_cursor_position @tree, n: @cursor.n, i: 0
1130                                 if prev_cursor is null # if in first text run of document
1131                                         # do nothing (there's nothing text-like to the left of the cursor)
1132                                         return
1133                                 # else merge with prev/outer text run
1134                                 pcb = @find_block_parent prev_cursor.n
1135                                 while block.children.length > 0
1136                                         @move_node block.children[0], pcb
1137                                 @remove_node block
1138                                 # merge possible consecutive text nodes at @cursor
1139                                 merge_state = n: @cursor.n
1140                                 @_merge_left merge_state
1141                                 @text_cleanup merge_state.n
1142                                 new_cursor = new_cursor_position n: merge_state.n, i: merge_state.i
1143                         else # at start of text node, but not start of text run
1144                                 prev = run[run_i - 1]
1145                                 if prev.type is 'text' # if previous in text run is text
1146                                         if prev.text.length is 1 # if emptying prev (in text run)
1147                                                 @_backspace_node_helper prev, run, run_i
1148                                                 merge_state = n: @cursor.n, i: @cursor.i
1149                                                 @_merge_left merge_state
1150                                                 @text_cleanup merge_state.n
1151                                                 new_cursor = new_cursor_position n: merge_state.n, i: merge_state.i
1152                                         else # prev in run is text with muliple chars
1153                                                 # delete last character in prev
1154                                                 prev.text = prev.text.substr(0, prev.text.length - 1)
1155                                                 prev.el.textContent = prev.text
1156                                                 @text_cleanup @cursor.n
1157                                                 new_cursor = new_cursor_position n: @cursor.n, i: @cursor.i
1158                                 else if prev.name is 'br' or prev.name is 'hr'
1159                                         @_backspace_node_helper prev, run, run_i
1160                                         merge_state = n: @cursor.n, i: @cursor.i
1161                                         @_merge_left merge_state
1162                                         @text_cleanup merge_state.n
1163                                         new_cursor = new_cursor_position n: merge_state.n, i: merge_state.i
1164                                 # FIXME implement this:
1165                                 # else # if prev (in run) is inline-block
1166                                         # if that inline-block has text in it
1167                                                 # delete last char in prev inlineblock
1168                                                 # if that empties it
1169                                                         # delete it
1170                                                         # merge left
1171                                                 # else
1172                                                         # move cursor inside
1173                                         # else
1174                                                 # delete prev (inline) block
1175                                                 # merge left
1176                                         # auto-delete this @cursor.parent(s) if this empties them
1177                 else # cursor is not at start of text node
1178                         run ?= @get_text_run @cursor.n
1179                         if @cursor.n.text.length is 1 # if emptying text node
1180                                 if run.length is 1 # if emptying text run (of text/br/hr/inline-block)
1181                                         # remove inline-parents of @cursor.n
1182                                         block = @find_block_parent @cursor.n
1183                                         changed = false
1184                                         n = @cursor.n.parent
1185                                         # note: this doesn't use _backspace_node_helper because:
1186                                         # 1. we don't want to delete the target node (we're replacing it's contents)
1187                                         # 2. we want to track whether anything was removed
1188                                         # 3. we know already know there's no other text from this run anywhere
1189                                         while n and n isnt block
1190                                                 changed = true
1191                                                 while n.children.length > 0
1192                                                         @move_node n.children[0], n.parent, n
1193                                                 @remove_node n
1194                                                 n = n.parent
1195                                         # replace @cursor.n with a single (preserved) space
1196                                         if @cursor.n.text != ' '
1197                                                 changed = true
1198                                                 @cursor.n.text = @cursor.n.el.textContent = ' '
1199                                         if changed
1200                                                 @text_cleanup @cursor.n
1201                                         # place the cursor to the left of that space
1202                                         new_cursor = new_cursor_position n: @cursor.n, i: 0
1203                                 else # emptying a text node (but not a whole text run)
1204                                         # figure out where cursor should land
1205                                         block = @find_block_parent @cursor.n
1206                                         new_cursor = find_prev_cursor_position @tree, n: @cursor.n, i: 0
1207                                         ncb = @find_block_parent new_cursor.n
1208                                         if ncb isnt block
1209                                                 new_cursor = find_next_cursor_position @tree, n: @cursor.n, i: 1
1210                                         # delete text node and cleanup emptied parents
1211                                         run_i = run.indexOf @cursor.n
1212                                         @_backspace_node_helper @cursor.n, run, run_i
1213                                         # see if new adjacent siblings should merge
1214                                         # TODO make smarter
1215                                         if run_i > 0 and run_i + 1 < run.length
1216                                                 if run[run_i - 1].type is 'text' and run[run_i + 1].type is 'text'
1217                                                         merge_state = n: run[run_i + 1]
1218                                                         @_merge_left merge_state
1219                                                         if merge_state.moved_cursor
1220                                                                 new_cursor = merge_state
1221                                         # update whitespace preservation
1222                                         @text_cleanup(block)
1223                                         # update cursor x/y in case things moved around
1224                                         if new_cursor?
1225                                                 if new_cursor.n.el.parentNode # still in dom after cleanup
1226                                                         new_cursor = new_cursor_position n: new_cursor.n, i: new_cursor.i
1227                                                 else
1228                                                         new_cursor = null
1229                         else # there's a char left of cursor that we can delete without emptying anything
1230                                 # delete character
1231                                 need_text_cleanup = true
1232                                 if @cursor.i > 1 and @cursor.i < @cursor.n.text.length
1233                                         pre = @cursor.n.text.substr(@cursor.i - 2, 3)
1234                                         post = pre.charAt(0) + pre.charAt(2)
1235                                         if str_has_ws_run(pre) is str_has_ws_run(post)
1236                                                 need_text_cleanup = false
1237                                 @remove_character(@cursor.n, @cursor.i - 1)
1238                                 # call text_cleanup if whe created/removed a whitespace run
1239                                 if need_text_cleanup
1240                                         @text_cleanup @cursor.n
1241                                 new_cursor = new_cursor_position n: @cursor.n, i: @cursor.i - 1
1242                 # mark document changed and move the cursor
1243                 if changed?
1244                         @changed()
1245                 if new_cursor?
1246                         @move_cursor new_cursor
1247                 else
1248                         @kill_cursor()
1249                 return
1250         on_page_up_key: (e) ->
1251                 if @wrap2.scrollTop is 0
1252                         return unless @cursor?
1253                         new_cursor = first_cursor_position @tree
1254                         if new_cursor?
1255                                 if new_cursor.n isnt @cursor.n or new_cursor.i isnt @cursor.i
1256                                         @move_cursor new_cursor
1257                         return
1258                 if @cursor?
1259                         screen_y = @cursor.y - @wrap2.scrollTop
1260                 scroll_amount = @wrap2_height - breathing_room
1261                 @wrap2.scrollTop = Math.max 0, @wrap2.scrollTop - scroll_amount
1262                 if @cursor?
1263                         @move_cursor_into_view screen_y + @wrap2.scrollTop
1264         on_page_down_key: (e) ->
1265                 lowest_scrollpos = @wrap2.scrollHeight - @wrap2_height
1266                 if @wrap2.scrollTop is lowest_scrollpos
1267                         return unless @cursor?
1268                         new_cursor = last_cursor_position @tree
1269                         if new_cursor?
1270                                 if new_cursor.n isnt @cursor.n or new_cursor.i isnt @cursor.i
1271                                         @move_cursor new_cursor
1272                         return
1273                 if @cursor?
1274                         screen_y = @cursor.y - @wrap2.scrollTop
1275                 scroll_amount = @wrap2_height - breathing_room
1276                 @wrap2.scrollTop = Math.min lowest_scrollpos, @wrap2.scrollTop + scroll_amount
1277                 if @cursor?
1278                         @move_cursor_into_view screen_y + @wrap2.scrollTop
1279                 return
1280         move_cursor_into_view: (y_target) ->
1281                 return if y_target is @cursor.y
1282                 was = @cursor
1283                 y_min = @wrap2.scrollTop
1284                 unless @wrap2.scrollTop is 0
1285                         y_min += breathing_room
1286                 y_max = @wrap2.scrollTop + @wrap2_height
1287                 unless @wrap2.scrollTop is @wrap2.scrollHeight - @wrap2_height # downmost
1288                         y_max -= breathing_room
1289                 y_target = Math.min y_target, y_max
1290                 y_target = Math.max y_target, y_min
1291                 if y_target < @cursor.y
1292                         finder = find_up_cursor_position
1293                         far_enough = (cur, target_y) ->
1294                                 return cur.y + cur.h <= target_y
1295                 else
1296                         finder = find_down_cursor_position
1297                         far_enough = (cur, y_target) ->
1298                                 return cur.y >= y_target
1299                 loop
1300                         cur = finder @tree, was, @cursor_ideal_x
1301                         break unless cur?
1302                         break if far_enough cur, y_target
1303                         was = cur
1304                 if was is @cursor
1305                         was = null
1306                 if was?
1307                         if was.y + was.h > y_max
1308                                 was = null
1309                         else if was.y < y_min
1310                                 was = null
1311                 if cur?
1312                         if cur.y + cur.h > y_max
1313                                 cur = null
1314                         else if cur.y < y_min
1315                                 cur = null
1316                 if cur? and was?
1317                         # both valid, pick best
1318                         if cur.y < y_min
1319                                 new_cursor = was
1320                         else if was.y + was.h > y_max
1321                                 new_cursor = cur
1322                         else if cur.y - y_target < y_target - was.y
1323                                 new_cursor = cur
1324                         else
1325                                 new_cursor = was
1326                 else
1327                         new_cursor = was ? cur
1328                 if new_cursor?
1329                         saved_ideal_x = @cursor_ideal_x
1330                         @move_cursor new_cursor
1331                         @cursor_ideal_x = saved_ideal_x
1332                 return
1333         clear_dom: -> # remove all the editable content (and cursor, overlays, etc)
1334                 while @idoc.body.childNodes.length
1335                         @idoc.body.removeChild @idoc.body.childNodes[0]
1336                 @kill_cursor()
1337                 return
1338         load_html: (html) ->
1339                 @tree = peach_parser.parse html, @parser_opts
1340                 if !@tree[0]?.parent
1341                         @tree = peach_parser.parse '<p style="white-space: pre-wrap"> </p>', @parser_opts
1342                 @tree_parent = @tree[0]?.parent
1343                 @tree_parent.el = @idoc.body
1344                 @clear_dom()
1345                 instantiate_tree @tree, @tree_parent.el
1346                 @collapse_whitespace @tree
1347                 @changed()
1348         changed: ->
1349                 @in_el.onchange = null
1350                 @in_el.value = @pretty_html @tree
1351                 @in_el.onchange = =>
1352                         @load_html @in_el.value
1353                 @adjust_iframe_height()
1354         adjust_iframe_height: ->
1355                 s = @wrap2.scrollTop
1356                 # when the content gets shorter, the idoc's body tag will continue to
1357                 # report the old (too big) height in Chrome. The workaround is to
1358                 # shrink the iframe before the content height:
1359                 @iframe.style.height = "10px"
1360                 h = parseInt(@idoc.body.scrollHeight, 10)
1361                 @iframe.style.height = "#{h}px"
1362                 @wrap2.scrollTop = s
1363         # does this node have whitespace that would be collapsed by white-space: normal?
1364         # note: this checks direct text children, and does _not_ recurse into child tags
1365         # tag is a node with type:"tag"
1366         # FIXME use new textrun api
1367         has_collapsable_space: (tag) ->
1368                 for n in tag.children
1369                         if n.type is 'text'
1370                                 for i in [0...n.text.length]
1371                                         code = n.text.charCodeAt i
1372                                         if code isnt 32 and is_space_code code
1373                                                 # tab, return
1374                                                 return true
1375                                         # check for double spaces that don't surround insert location
1376                                         continue if i is 0
1377                                         if n.text.substr(i - 1, 2) is '  '
1378                                                 return true
1379                                 if n.text.length > 0
1380                                         if is_space_code n.text.charCodeAt 0
1381                                                 return true
1382                                         if is_space_code n.text.charCodeAt n.text.length - 1
1383                                                 return true
1384                 return false
1385         # true if n is text node with only one caracter, and the only child of a tag
1386         is_only_char_in_tag: (n, i) ->
1387                 return false unless n.type is 'text'
1388                 return false unless n.text.length is 1
1389                 return false if n.parent is @tree_parent
1390                 return false unless n.parent.children.length is 1
1391                 return true
1392         # true if n is text node with just a space in it, and the only child of a tag
1393         is_lone_space: (n, i) ->
1394                 return false unless n.type is 'text'
1395                 return false unless n.text is ' '
1396                 return false if n.parent is @tree_parent
1397                 return false unless n.parent.children.length is 1
1398                 return true
1399         # detect special case: typing before a space that's the only thing in a block/doc
1400         # reason: enter key creates blocks with just a space in them
1401         insert_should_replace: (n, i) ->
1402                 return false unless i is 0
1403                 return false unless n.text is ' '
1404                 return true if n.parent is @tree_parent
1405                 if n.parent.children.length is 1
1406                         if n.parent.children[0] is n
1407                                 # n is only child
1408                                 return true
1409                 return false
1410         # after calling this, you MUST call changed() and text_cleanup()
1411         insert_character: (n, i, char) ->
1412                 return if n.parent is @tree_parent # FIXME implement text nodes at top level
1413                 # insert the character
1414                 if @insert_should_replace n, i
1415                         n.text = char
1416                 else if i is 0
1417                         n.text = char + n.text
1418                 else if i is n.text.length
1419                         # replace the space
1420                         n.text += char
1421                 else
1422                         n.text =
1423                                 n.text.substr(0, i) +
1424                                 char +
1425                                 n.text.substr(i)
1426                 n.el.nodeValue = n.text
1427         # WARNING: after calling this, you MUST call changed() and text_cleanup()
1428         remove_character: (n, i) ->
1429                 n.text = n.text.substr(0, i) + n.text.substr(i + 1)
1430                 n.el.nodeValue = n.text
1431         computed_style: (n, prop) ->
1432                 if n.type is 'text'
1433                         n = n.parent
1434                 style = @iframe.contentWindow.getComputedStyle n.el, null
1435                 return style.getPropertyValue prop
1436         # returns the new white-space value that will preserve spaces for node n
1437         preserve_space: (n, ideal_target) ->
1438                 if n.type is 'text'
1439                         target = n.parent
1440                 else
1441                         target = n
1442                 while target isnt ideal_target and not target.el.style.whiteSpace
1443                         unless target?
1444                                 console.log "bug #967123"
1445                                 return
1446                         target = target.parent
1447                 ws = ws_props[target.el.style.whiteSpace]?.to_preserve
1448                 ws ?= 'pre-wrap'
1449                 target.el.style.whiteSpace = ws
1450                 @update_style_from_el target
1451                 return ws
1452         update_style_from_el: (n) ->
1453                 style = n.el.getAttribute 'style'
1454                 if style?
1455                         n.attrs.style = style
1456                 else
1457                         if n.attrs.style?
1458                                 delete n.attrs.style
1459         # remove whitespace that would be trimmed
1460         # replace whitespace that would collapse with a single space
1461         collapse_whitespace: (tree = @tree) ->
1462                 return collapse_whitespace tree # FIXME CONTINUE
1463                 return
1464         # call this after you insert or remove inline nodes. It will:
1465         #    merge consecutive text nodes
1466         #    remove empty text nodes
1467         #    adjust white-space property
1468         # note: this assumes that all whitespace in text nodes should be displayed
1469         # (ie not collapse or be trimmed) and will change the white-space property
1470         # as needed to achieve this.
1471         text_cleanup: (n) ->
1472                 if @is_display_block n
1473                         block = n
1474                 else
1475                         block = @find_block_parent n
1476                         return unless block?
1477                 run = @get_text_run block
1478                 return unless run?
1479                 # merge consecutive text nodes
1480                 if run.length > 1
1481                         i = 1
1482                         prev = run[0]
1483                         while i < run.length
1484                                 n = run[i]
1485                                 if prev.type is 'text' and n.type is 'text'
1486                                         if prev.parent is n.parent
1487                                                 prev_i = n.parent.children.indexOf prev
1488                                                 n_i =    n.parent.children.indexOf n
1489                                                 if n_i is prev_i + 1
1490                                                         prev.text = prev.text + n.text
1491                                                         prev.el.textContent = prev.text
1492                                                         @remove_node n
1493                                                         run.splice i, 1
1494                                                         continue # don't increment i or change prev
1495                                 i += 1
1496                                 prev = n
1497                 # remove empty text nodes
1498                 i = 0
1499                 while i < run.length
1500                         n = run[i]
1501                         if n.type is 'text'
1502                                 if n.text is ''
1503                                         @remove_node n
1504                                         # FIXME maybe remove parents recursively if this makes them empty
1505                                         run.splice i, 1
1506                                         continue # don't increment i
1507                         i += 1
1508                 # note: inline tags can have white-space:pre-line/etc
1509                 # note: inline-blocks have their whitespace collapsed independantly of outer run
1510                 # note: inline-blocks are treated like non-whitespace char even if empty
1511                 if block.el.style.whiteSpace?
1512                         ws = block.el.style.whiteSpace
1513                         if ws_props[ws]
1514                                 if ws_props[ws].space
1515                                         if ws_props[ws].to_collapse is 'normal'
1516                                                 block.el.style.whiteSpace = null
1517                                         else
1518                                                 block.el.style.whiteSpace = ws_props[ws].to_collapse
1519                                         @update_style_from_el block
1520                 # note: space after <br> colapses, but not space before
1521                 # check for spaces that would collapse without help
1522                 eats_start_sp = true # if the next node starts with space it collapses (unless pre)
1523                 prev = null
1524                 for n in run
1525                         if n.type is 'tag'
1526                                 if n.name is 'br'
1527                                         eats_start_sp = true
1528                                 else
1529                                         eats_start_sp = false
1530                         else # TEXT
1531                                 need_preserve = false
1532                                 if n.type isnt 'text'
1533                                         console.log "bug #232308"
1534                                         return
1535                                 if eats_start_sp
1536                                         if is_space_code n.text.charCodeAt 0
1537                                                 need_preserve = true
1538                                 unless need_preserve
1539                                         need_preserve = multi_sp_regex.test n.text
1540                                 if need_preserve
1541                                         # do we have it already?
1542                                         ws = @computed_style n, 'white-space' # FIXME implement this
1543                                         unless ws_props[ws]?.space
1544                                                 # 2nd arg is ideal target for css rule
1545                                                 ws = @preserve_space n, block
1546                                         eats_start_sp = false
1547                                 else
1548                                         if is_space_code n.text.charCodeAt(n.text.length - 1)
1549                                                 ws = @computed_style n, 'white-space' # FIXME implement this
1550                                                 if ws_props[ws]?.space
1551                                                         eats_start_sp = false
1552                                                 else
1553                                                         eats_start_sp = true
1554                                         else
1555                                                 eats_start_sp = false
1556                 # check if text ends with a collapsable space
1557                 if run.length > 0
1558                         last = run[run.length - 1]
1559                         if last.type is 'text'
1560                                 if eats_start_sp
1561                                         @preserve_space last, block
1562                 return
1563         css_clear: (n, prop) ->
1564                 return unless n.attrs.style?
1565                 return if n.attrs.style is ''
1566                 css_delimiter_regex = new RegExp('\s*;\s*', 'g') # FIXME make this global
1567                 styles = n.attrs.style.trim().split css_delimiter
1568                 return unless styles.length > 0
1569                 if styles[styles.length - 1] is ''
1570                         styles.pop()
1571                         return unless styles.length > 0
1572                 i = 0
1573                 while i < styles.length
1574                         if styles[i].substr(0, 12) is 'white-space:'
1575                                 styles.splice i, 1
1576                         else
1577                                 i += 1
1578                 return
1579         # WARNING: after calling this one or more times, you MUST:
1580         #    if it's inline: call @text_cleanup
1581         #    call @changed()
1582         remove_node: (n) ->
1583                 i = n.parent.children.indexOf n
1584                 if i is -1
1585                         throw "BUG #9187112313"
1586                 n.el.parentNode.removeChild n.el
1587                 n.parent.children.splice i, 1
1588                 return
1589         # remove a node from the tree/dom, insert into new_parent before insert_before?end
1590         # WARNING: after calling this one or more times, you MUST:
1591         #    if it's inline: call @text_cleanup
1592         #    call @changed()
1593         move_node: (n, new_parent, insert_before = null) ->
1594                 i = n.parent.children.indexOf n
1595                 if i is -1
1596                         throw "Error: tried to remove node, but it's not in it's parents list of children"
1597                         return
1598                 if insert_before?
1599                         before_i = new_parent.children.indexOf insert_before
1600                         if i is -1
1601                                 throw "Error: tried to move a node to be before a non-existent node"
1602                         insert_before = insert_before.el
1603                 @remove_node n
1604                 if insert_before?
1605                         new_parent.el.insertBefore n.el, insert_before
1606                         new_parent.children.splice before_i, 0, n
1607                 else
1608                         new_parent.el.appendChild n.el, insert_before
1609                         new_parent.children.push n
1610                 n.parent = new_parent
1611                 return
1612         kill_cursor: -> # remove it, forget where it was
1613                 if @cursor_visible
1614                         @cursor_el.parentNode.removeChild @cursor_el
1615                         @cursor_visible = false
1616                 @cursor = null
1617                 @annotate null
1618                 return
1619         move_cursor: (cursor) ->
1620                 @cursor_ideal_x = cursor.x
1621                 @cursor = cursor
1622                 unless @cursor_visible
1623                         @cursor_el = domify @outer_idoc, div: id: 'cursor'
1624                         @overlay.appendChild @cursor_el
1625                         @cursor_visible = true
1626                 @cursor_el.style.left = "#{cursor.x + overlay_padding - 1}px"
1627                 if cursor.h < 5
1628                         height = 12
1629                 else
1630                         height = cursor.h
1631                 @cursor_el.style.top = "#{cursor.y + overlay_padding + Math.round(height * .07)}px"
1632                 @cursor_el.style.height = "#{Math.round height * 0.82}px"
1633                 @annotate cursor.n
1634                 @scroll_into_view cursor.y, height
1635                 return
1636         scroll_into_view: (y, h = 0) ->
1637                 y += overlay_padding # convert units from @idoc to @wrap2
1638                 # very top of document
1639                 if y <= breathing_room
1640                         @wrap2.scrollTop = 0
1641                         return
1642                 # very bottom of document
1643                 if y + h >= @wrap2.scrollHeight - breathing_room
1644                         @wrap2.scrollTop = @wrap2.scrollHeight - @wrap2_height
1645                         return
1646                 # The most scrolled up (lowest value for scrollTop) that would be OK
1647                 upmost = y + h + breathing_room - @wrap2_height
1648                 upmost = Math.max(upmost, 0)
1649                 # the most scrolled down (highest value for scrollTop) that would be OK
1650                 downmost = y - breathing_room
1651                 downmost = Math.min(downmost, @wrap2.scrollHeight - @wrap2_height)
1652                 if upmost > downmost # means h is too big to fit
1653                         # scroll so top is visible
1654                         @wrap2.scrollTop = downmost
1655                         return
1656                 if @wrap2.scrollTop < upmost
1657                         @wrap2.scrollTop = upmost
1658                         return
1659                 if @wrap2.scrollTop > downmost
1660                         @wrap2.scrollTop = downmost
1661                         return
1662                 return
1663         annotate: (n) ->
1664                 while @matting.length > 0
1665                         @overlay.removeChild @matting[0]
1666                         @matting.shift()
1667                 return unless n?
1668                 prev_bounds = x: 0, y: 0, w: 0, h: 0
1669                 alpha = 0.1
1670                 while n?.el? and n isnt @tree_parent
1671                         if n.type is 'text'
1672                                 n = n.parent
1673                                 continue
1674                         bounds = get_el_bounds n.el
1675                         return unless bounds?
1676                         if bounds.x is prev_bounds.x and bounds.y is prev_bounds.y and bounds.w is prev_bounds.w and bounds.h is prev_bounds.h
1677                                 n = n.parent
1678                                 continue
1679                         ann_box = domify @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});
1680                         @overlay.appendChild ann_box
1681                         @matting.push ann_box
1682                         ann_tag = domify @outer_idoc, div: class: 'ann_tag', style: "left: #{bounds.x + 1 + overlay_padding}px; top: #{bounds.y - 7 + overlay_padding}px", children: [domify @outer_idoc, text: " #{n.name} "]
1683                         @overlay.appendChild ann_tag
1684                         @matting.push ann_tag
1685                         n = n.parent
1686                         alpha *= 1.5
1687         pretty_html: (tree, indent = '', parent_flags = pre_ish: false, block: true, want_nl: false) ->
1688                 ret = ''
1689                 want_nl = parent_flags.want_nl
1690                 prev_in_flow_is_text = false
1691                 prev_in_flow_is_block = false
1692                 for n, i in tree
1693                         # figure out flags
1694                         inner_flags = want_nl: true
1695                         is_br = false
1696                         switch n.type
1697                                 when 'tag'
1698                                         if n.name is 'br'
1699                                                 is_br = true
1700                                         is_text = false
1701                                         if n.el.currentStyle?
1702                                                 cs = n.el.currentStyle
1703                                                 whitespace = cs['white-space']
1704                                                 display = cs['display']
1705                                                 position = cs['position']
1706                                                 float = cs['float']
1707                                                 visibility = cs['visibility']
1708                                         else
1709                                                 cs = @iframe.contentWindow.getComputedStyle(n.el, null)
1710                                                 whitespace = cs.getPropertyValue 'white-space'
1711                                                 display = cs.getPropertyValue 'display'
1712                                                 position = cs.getPropertyValue 'position'
1713                                                 float = cs.getPropertyValue 'float'
1714                                                 visibility = cs.getPropertyValue 'visibility'
1715                                         if n.name is 'textarea'
1716                                                 inner_flags.pre_ish = true
1717                                         else
1718                                                 inner_flags.pre_ish = whitespace.substr(0, 3) is 'pre'
1719                                         switch float
1720                                                 when 'left', 'right'
1721                                                         in_flow = false
1722                                                 else
1723                                                         switch position
1724                                                                 when 'absolute', 'fixed'
1725                                                                         in_flow = false
1726                                                                 else
1727                                                                         if 'display' is 'none'
1728                                                                                 in_flow = false
1729                                                                         else
1730                                                                                 switch visibility
1731                                                                                         when 'hidden', 'collapse'
1732                                                                                                 in_flow = false
1733                                                                                         else # visible
1734                                                                                                 in_flow = true
1735                                         switch display
1736                                                 when 'inline', 'none'
1737                                                         inner_flags.block = false
1738                                                         is_block = in_flow_block = false
1739                                                 when 'inline-black'
1740                                                         inner_flags.block = true
1741                                                         is_block = in_flow_block = false
1742                                                 else # block, table, etc
1743                                                         inner_flags.block = true
1744                                                         is_block = true
1745                                                         in_flow_block = in_flow
1746                                 when 'text'
1747                                         is_text = true
1748                                         is_block = false
1749                                         in_flow = true
1750                                         in_flow_block = false
1751                                 else # 'comment', 'doctype'
1752                                         is_text = false
1753                                         is_block = false
1754                                         in_flow = false
1755                                         in_flow_block = false
1756                         # print whitespace if we can
1757                         unless parent_flags.pre_ish
1758                                 unless prev_in_flow_is_text and is_br
1759                                         if (i is 0 and parent_flags.block) or in_flow_block or prev_in_flow_is_block
1760                                                 if want_nl
1761                                                         ret += "\n"
1762                                                 ret += indent
1763                         switch n.type
1764                                 when 'tag'
1765                                         ret += '<' + n.name
1766                                         attr_keys = []
1767                                         for k of n.attrs
1768                                                 attr_keys.unshift k
1769                                         #attr_keys.sort()
1770                                         for k in attr_keys
1771                                                 ret += " #{k}"
1772                                                 if n.attrs[k].length > 0
1773                                                         ret += "=\"#{enc_attr n.attrs[k]}\""
1774                                         ret += '>'
1775                                         unless void_elements[n.name]?
1776                                                 if inner_flags.block
1777                                                         next_indent = indent + '    '
1778                                                 else
1779                                                         next_indent = indent
1780                                                 if n.children.length
1781                                                         ret += @pretty_html n.children, next_indent, inner_flags
1782                                                 ret += "</#{n.name}>"
1783                                 when 'text'
1784                                         ret += enc_text n.text
1785                                 when 'comment'
1786                                         ret += "<!--#{n.text}-->" # TODO encode?
1787                                 when 'doctype'
1788                                         ret += "<!DOCTYPE #{n.name}"
1789                                         if n.public_identifier? and n.public_identifier.length > 0
1790                                                 ret += " \"#{n.public_identifier}\""
1791                                         if n.system_identifier? and n.system_identifier.length > 0
1792                                                 ret += " \"#{n.system_identifier}\""
1793                                         ret += ">"
1794                         want_nl = true
1795                         if in_flow
1796                                 prev_in_flow_is_text = is_text
1797                                 prev_in_flow_is_block = is_block or (in_flow and is_br)
1798                 if tree.length
1799                         # output final newline if allowed
1800                         unless parent_flags.pre_ish
1801                                 if prev_in_flow_is_block or parent_flags.block
1802                                         ret += "\n#{indent.substr 4}"
1803                 return ret
1804         onblur: ->
1805                 @kill_cursor()
1806         have_focus: ->
1807                 @editor_is_focused = true
1808                 @poll_for_blur()
1809         poll_for_blur: ->
1810                 return if @poll_for_blur_timeout? # already polling
1811                 @poll_for_blur_timeout = timeout 150, =>
1812                         next_frame => # pause polling when browser knows we're not active/visible/etc.
1813                                 @poll_for_blur_timeout = null
1814                                 if document.activeElement is @outer_iframe
1815                                         @poll_for_blur()
1816                                 else
1817                                         @editor_is_focused = false
1818                                         @onblur()
1819
1820 window.peach_html5_editor = (args...) ->
1821         return new PeachHTML5Editor args...
1822
1823 # test in browser: peach_html5_editor(document.getElementsByTagName('textarea')[0])