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
  20 timeout = (ms, cb) -> return setTimeout cb, ms
  21 next_frame = (cb) ->
  22         if (window.requestAnimationFrame?)
  23                 window.requestAnimationFrame cb
  24         else
  25                 timeout 16, cb
  26
  27 this_url_sans_path = ->
  28         ret = "#{window.location.href}"
  29         clip = ret.lastIndexOf '#'
  30         if clip > -1
  31                 ret = ret.substr 0, clip
  32         clip = ret.lastIndexOf '?'
  33         if clip > -1
  34                 ret = ret.substr 0, clip
  35         clip = ret.lastIndexOf '/'
  36         if clip > -1
  37                 ret = ret.substr 0, clip + 1
  38         return ret
  39
  40 # xml 1.0 spec, chromium and firefox accept these, plus lots of unicode chars
  41 valid_attr_regex = new RegExp '^[a-zA-Z_:][-a-zA-Z0-9_:.]*$'
  42 # html5 spec is much more lax, but chromium won't let me make at attribute with the name "4"
  43 js_attr_regex = new RegExp '^[oO][nN].'
  44
  45 debug_dot_at = (doc, x, y) ->
  46         return # disabled
  47         el = doc.createElement 'div'
  48         el.setAttribute 'style', "position: absolute; left: #{x}px; top: #{y}px; width: 1px; height: 3px; background-color: red"
  49         doc.body.appendChild el
  50         #console.log(new Error().stack)
  51
  52 # text nodes don't have getBoundingClientRect(), so use selection api to find
  53 # it.
  54 get_el_bounds = (el) ->
  55         if el.getBoundingClientRect?
  56                 rect = el.getBoundingClientRect()
  57         else
  58                 # text nodes don't have getBoundingClientRect(), so use range api
  59                 range = el.ownerDocument.createRange()
  60                 range.selectNodeContents el
  61                 rect = range.getBoundingClientRect()
  62         doc = el.ownerDocument.documentElement
  63         win = el.ownerDocument.defaultView
  64         y_fix = win.pageYOffset - doc.clientTop
  65         x_fix = win.pageXOffset - doc.clientLeft
  66         return {
  67                 x: rect.left + x_fix
  68                 y: rect.top + y_fix
  69                 w: rect.width ? (rect.right - rect.left)
  70                 h: rect.height ? (rect.top - rect.bottom)
  71         }
  72
  73 is_display_block = (el) ->
  74         if el.currentStyle?
  75                 return el.currentStyle.display is 'block'
  76         else
  77                 return window.getComputedStyle(el, null).getPropertyValue('display') is 'block'
  78
  79 # Pass return value from dom event handlers to this.
  80 # If they return false, this will addinionally stop propagation and default.
  81 event_return = (e, bool) ->
  82         if bool is false
  83                 if e.stopPropagation?
  84                         e.stopPropagation()
  85                 if e.preventDefault?
  86                         e.preventDefault()
  87         return bool
  88 # Warning: currently assumes you're asking about a single character
  89 # Note: chromium returns multiple bounding rects for a space at a line-break
  90 # Note: chromium's getBoundingClientRect() is broken (when zero-area client rects)
  91 # Note: sometimes returns null (eg for whitespace that is not visible)
  92 text_range_bounds = (el, start, end) ->
  93         range = document.createRange()
  94         range.setStart el, start
  95         range.setEnd el, end
  96         rects = range.getClientRects()
  97         if rects.length > 0
  98                 rect = rects[0]
  99         else
 100                 return null
 101         doc = el.ownerDocument.documentElement
 102         win = el.ownerDocument.defaultView
 103         y_fix = win.pageYOffset - doc.clientTop
 104         x_fix = win.pageXOffset - doc.clientLeft
 105         return {
 106                 x: rect.left + x_fix
 107                 y: rect.top + y_fix
 108                 w: rect.width ? (rect.right - rect.left)
 109                 h: rect.height ? (rect.top - rect.bottom)
 110                 rects: rects
 111                 bounding: range.getBoundingClientRect()
 112         }
 113
 114 # figure out the x/y coordinates of where the cursor should be if it's at
 115 # position ``i`` within text node ``n``
 116 # sometimes returns null (eg for whitespace that is not visible)
 117 window.cursor_to_xyh = cursor_to_xyh = (n, i) ->
 118         range = document.createRange()
 119         if n.text.length is 0
 120                 ret = text_range_bounds n.el, 0, 0
 121         else if i is n.text.length
 122                 ret = text_range_bounds n.el, i - 1, i
 123                 if ret?
 124                         ret.x += ret.w
 125         else
 126                 ret = text_range_bounds n.el, i, i + 1
 127         if ret?
 128                 debug_dot_at n.el.ownerDocument, ret.x, ret.y
 129         return ret
 130
 131 # encode text so it can be safely placed inside an html attribute
 132 enc_attr_regex = new RegExp '(&)|(")|(\u00A0)', 'g'
 133 enc_attr = (txt) ->
 134         return txt.replace enc_attr_regex, (match, amp, quote) ->
 135                 return '&amp;' if (amp)
 136                 return '&quot;' if (quote)
 137                 return '&nbsp;'
 138 enc_text_regex = new RegExp '(&)|(<)|(\u00A0)', 'g'
 139 enc_text = (txt) ->
 140         return txt.replace enc_text_regex, (match, amp, lt) ->
 141                 return '&amp;' if (amp)
 142                 return '&lt;' if (lt)
 143                 return '&nbsp;'
 144
 145 void_elements = {
 146         area: true
 147         base: true
 148         br: true
 149         col: true
 150         embed: true
 151         hr: true
 152         img: true
 153         input: true
 154         keygen: true
 155         link: true
 156         meta: true
 157         param: true
 158         source: true
 159         track: true
 160         wbr: true
 161 }
 162 # TODO make these always pretty-print (on the inside) like blocks
 163 no_text_elements = { # these elements never contain text
 164         select: true
 165         table: true
 166         tr: true
 167         thead: true
 168         tbody: true
 169         ul: true
 170         ol: true
 171 }
 172
 173 domify = (doc, hash) ->
 174         for tag, attrs of hash
 175                 if tag is 'text'
 176                         return document.createTextNode attrs
 177                 el = document.createElement tag
 178                 for k, v of attrs
 179                         if k is 'children'
 180                                 for child in v
 181                                         el.appendChild child
 182                         else
 183                                 el.setAttribute k, v
 184         return el
 185
 186 outer_css = (args) ->
 187         w = args.w ? 300
 188         h = args.h ? 300
 189         inner_padding = args.inner_padding ? overlay_padding
 190         frame_width = args.frame_width ? inner_padding
 191         # TODO editor controls height...
 192         occupy = (left, top = left, right = left, bottom = top) ->
 193                 w -= left + right
 194                 h -= top + bottom
 195                 return Math.max(left, top, right, bottom)
 196         ret = ''
 197         ret += 'body {'
 198         ret +=     'margin: 0;'
 199         ret +=     'padding: 0;'
 200         ret +=     'color: black;'
 201         ret +=     'background: white;'
 202         ret += '}'
 203         ret += '#wrap1 {'
 204         ret +=     "border: #{occupy 1}px solid black;"
 205         ret +=     "padding: #{occupy frame_width}px;"
 206         ret += '}'
 207         ret += '#wrap2 {'
 208         ret +=     "border: #{occupy 1}px solid black;"
 209         ret +=     "padding: #{occupy inner_padding}px;"
 210         ret +=     "padding-right: #{inner_padding + occupy 0, 0, 15, 0}px;" # for scroll bar
 211         ret +=     "width: #{w}px;"
 212         ret +=     "height: #{h}px;"
 213         ret +=     'overflow-x: hidden;'
 214         ret +=     'overflow-y: scroll;'
 215         ret += '}'
 216         ret += '#wrap3 {'
 217         ret +=     'position: relative;'
 218         ret +=     "width: #{w}px;"
 219         ret +=     "min-height: #{h}px;"
 220         ret += '}'
 221         ret += 'iframe {'
 222         ret +=     'box-sizing: border-box;'
 223         ret +=     'margin: 0;'
 224         ret +=     'border: none;'
 225         ret +=     'padding: 0;'
 226         ret +=     "width: #{w}px;"
 227         #ret +=     "height: #{h}px;" # height auto-set when content set/changed
 228         ret +=     '-ms-user-select: none;'
 229         ret +=     '-webkit-user-select: none;'
 230         ret +=     '-moz-user-select: none;'
 231         ret +=     'user-select: none;'
 232         ret += '}'
 233         ret += '#overlay {'
 234         ret +=     'position: absolute;'
 235         ret +=     "left: -#{inner_padding}px;"
 236         ret +=     "top: -#{inner_padding}px;"
 237         ret +=     "right: -#{inner_padding}px;"
 238         ret +=     "bottom: -#{inner_padding}px;"
 239         ret +=     'overflow: hidden;'
 240         ret += '}'
 241         ret += '.lightbox {'
 242         ret +=     'position: absolute;'
 243         ret +=     'background: rgba(100,100,100,0.2);'
 244         ret += '}'
 245         ret += '#cursor {'
 246         ret +=     'position: absolute;'
 247         ret +=     'width: 2px;'
 248         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));'
 249         ret +=     'background-size: 200% 200%;'
 250         ret +=     '-webkit-animation: blink 1s linear normal infinite;'
 251         ret +=     'animation: blink 1s linear normal infinite;'
 252         ret += '}'
 253         ret += '@-webkit-keyframes blink {'
 254         ret +=     '0%{background-position:0% 0%}'
 255         ret +=     '100%{background-position:0% -100%}'
 256         ret += '}'
 257         ret += '@keyframes blink { '
 258         ret +=     '0%{background-position:0% 0%}'
 259         ret +=     '100%{background-position:0% -100%}'
 260         ret += '}'
 261         ret += '.ann_box {'
 262         ret +=     'z-index: 5;'
 263         ret +=     'position: absolute;'
 264         ret +=     'border: 1px solid rgba(0,0,0,0.1);'
 265         ret +=     'outline: 1px solid rgba(255,255,255,0.1);' # in case there's a black background
 266         ret += '}'
 267         ret += '.ann_tag {'
 268         ret +=     'z-index: 10;'
 269         ret +=     'position: absolute;'
 270         ret +=     'font-size: 8px;'
 271         ret +=     'white-space: pre;'
 272         ret +=     'background: rgba(255,255,255,0.4);'
 273         ret +=     '-ms-user-select: none;'
 274         ret +=     '-webkit-user-select: none;'
 275         ret +=     '-moz-user-select: none;'
 276         ret +=     'user-select: none;'
 277         ret += '}'
 278         return ret
 279
 280
 281 ignore_key_codes =
 282         '18': true # alt
 283         '20': true # capslock
 284         '17': true # ctrl
 285         '144': true # numlock
 286         '16': true # shift
 287         '91': true # windows "start" key
 288 # key codes: (valid on keydown, not keypress)
 289 KEY_LEFT = 37
 290 KEY_UP = 38
 291 KEY_RIGHT = 39
 292 KEY_DOWN = 40
 293 KEY_BACKSPACE = 8 # <--
 294 KEY_DELETE = 46 # -->
 295 KEY_END = 35
 296 KEY_ENTER = 13
 297 KEY_ESCAPE = 27
 298 KEY_HOME = 36
 299 KEY_INSERT = 45
 300 KEY_PAGE_UP = 33
 301 KEY_PAGE_DOWN = 34
 302 KEY_TAB = 9
 303 control_key_codes = # we react to these, but they aren't typing
 304         '37': KEY_LEFT
 305         '38': KEY_UP
 306         '39': KEY_RIGHT
 307         '40': KEY_DOWN
 308         '35': KEY_END
 309         '8':  KEY_BACKSPACE
 310         '46': KEY_DELETE
 311         '13': KEY_ENTER
 312         '27': KEY_ESCAPE
 313         '36': KEY_HOME
 314         '45': KEY_INSERT
 315         '33': KEY_PAGE_UP
 316         '34': KEY_PAGE_DOWN
 317         '9':  KEY_TAB
 318
 319 instantiate_tree = (tree, parent) ->
 320         remove = []
 321         for c, i in tree
 322                 switch c.type
 323                         when 'text'
 324                                 c.el = parent.ownerDocument.createTextNode c.text
 325                                 parent.appendChild c.el
 326                         when 'tag'
 327                                 if c.name in ['script', 'object', 'iframe', 'link']
 328                                         # TODO put placeholders instead
 329                                         remove.unshift i
 330                                         continue
 331                                 # TODO create in correct namespace
 332                                 c.el = parent.ownerDocument.createElement c.name
 333                                 for k, v of c.attrs
 334                                         # FIXME if attr_whitelist[k]?
 335                                         if valid_attr_regex.test k
 336                                                 unless js_attr_regex.test k
 337                                                         c.el.setAttribute k, v
 338                                 parent.appendChild c.el
 339                                 if c.children.length
 340                                         instantiate_tree c.children, c.el
 341         for i in remove
 342                 tree.splice i, 1
 343
 344 traverse_tree = (tree, cb) ->
 345         done = false
 346         for c in tree
 347                 done = cb c
 348                 return done if done
 349                 if c.children.length
 350                         done = traverse_tree c.children, cb
 351                         return done if done
 352         return done
 353
 354 find_next_cursor_position = (tree, n, i) ->
 355         if n.type is 'text' and n.text.length > i
 356                 orig_xyh = cursor_to_xyh n, i
 357                 unless orig_xyh?
 358                         console.log "ERROR: couldn't find xy for current cursor location"
 359                         return
 360                 for next_i in [i+1 .. n.text.length] # inclusive is valid (after last char)
 361                         next_xyh = cursor_to_xyh n, next_i
 362                         if next_xyh?
 363                                 if next_xyh.x > orig_xyh.x or next_xyh.y > orig_xyh.y
 364                                         return [n, next_i]
 365         state_before = true
 366         found = null
 367         traverse_tree tree, (node, state) ->
 368                 if node.type is 'text' and state_before is false
 369                         if cursor_to_xyh(node, 0)?
 370                                 found = node
 371                                 return true
 372                 if node is n
 373                         state_before = false
 374                 return false
 375         if found?
 376                 return [found, 0]
 377         return null
 378
 379 find_prev_cursor_position = (tree, n, i) ->
 380         if n? and n.type is 'text' and i > 0
 381                 orig_xyh = cursor_to_xyh n, i
 382                 unless orig_xyh?
 383                         console.log "ERROR: couldn't find xy for current cursor location"
 384                         return
 385                 for prev_i in [i-1 .. 0]
 386                         prev_xyh = cursor_to_xyh n, prev_i
 387                         if prev_xyh?
 388                                 if prev_xyh.x < orig_xyh.x or prev_xyh.y < orig_xyh.y
 389                                         return [n, prev_i]
 390                 return [n, i - 1]
 391         found_prev = n?
 392         found = null
 393         traverse_tree tree, (node) ->
 394                 if node.type is 'text'
 395                         if node is n
 396                                 if found_prev?
 397                                         found = found_prev
 398                                 return true
 399                         found_prev = node
 400                 return false
 401         if found?
 402                 if cursor_to_xyh found, found.text.length # text visible?
 403                         return [found, found.text.length]
 404                 return find_prev_cursor_position tree, found, 0
 405         return null
 406
 407 find_loc_cursor_position = (tree, loc) ->
 408         for c in tree
 409                 if c.type is 'tag' or c.type is 'text'
 410                         bounds = get_el_bounds c.el
 411                         continue if loc.x < bounds.x
 412                         continue if loc.x > bounds.x + bounds.w
 413                         continue if loc.y < bounds.y
 414                         continue if loc.y > bounds.y + bounds.h
 415                         if c.children.length
 416                                 ret = find_loc_cursor_position c.children, loc
 417                                 return ret if ret?
 418                         if c.type is 'text'
 419                                 # click is within bounding box that contains all text.
 420                                 return [c, 0] if c.text.length is 0
 421                                 before_i = 0
 422                                 before = cursor_to_xyh c, before_i
 423                                 unless before?
 424                                         console.log "error: failed to find cursor pixel location for start of", c
 425                                         return
 426                                 after_i = c.text.length
 427                                 after = cursor_to_xyh c, after_i
 428                                 unless after?
 429                                         console.log "error: failed to find cursor pixel location for end of", c
 430                                         return
 431                                 if loc.y < before.y + before.h and loc.x < before.x
 432                                         # console.log 'before first char on first line'
 433                                         continue
 434                                 if loc.y > after.y and loc.x > after.x
 435                                         # console.log 'after last char on last line'
 436                                         continue
 437                                 if loc.y < before.y
 438                                         console.log "Warning: click in bounding box but above first line"
 439                                         continue # above first line (runaround?)
 440                                 if loc.y > after.y + after.h
 441                                         console.log "Warning: click in bounding box but below last line", loc.y, after.y, after.h
 442                                         continue # below last line (shouldn't happen?)
 443                                 while after_i - before_i > 1
 444                                         cur_i = Math.round((before_i + after_i) / 2)
 445                                         cur = cursor_to_xyh c, cur_i
 446                                         unless loc?
 447                                                 console.log "error: failed to find cursor pixel location for", c, cur_i
 448                                                 return
 449                                         if loc.y < cur.y or (loc.y <= cur.y + cur.h and loc.x < cur.x)
 450                                                 after_i = cur_i
 451                                                 after = cur
 452                                         else
 453                                                 before_i = cur_i
 454                                                 before = cur
 455                                 # which one is closest?
 456                                 if Math.abs(before.x - loc.x) < Math.abs(after.x - loc.x)
 457                                         return [c, before_i]
 458                                 else
 459                                         return [c, after_i]
 460         return null
 461
 462 # browsers collapse these (html5 spec calls these "space characters")
 463 is_space_code = (char_code) ->
 464         switch char_code
 465                 when 9, 10, 12, 13, 32
 466                         return true
 467         return false
 468 is_space = (chr) ->
 469         return is_space_code chr.charCodeAt 0
 470
 471 tree_remove_empty_text_nodes = (tree) ->
 472         empties = []
 473         traverse_tree tree, (n) ->
 474                 if n.type is 'text'
 475                         if n.text.length is 0
 476                                 empties.unshift n
 477                 return false
 478         for n in empties
 479                 # don't completely empty the tree
 480                 if tree.length is 1
 481                         if tree[0].type is 'text'
 482                                 console.log "oop, leaving a blank node because it's the only thing"
 483                                 return
 484                 n.el.parentNode.removeChild n.el
 485                 for c, i in n.parent.children
 486                         if c is n
 487                                 n.parent.children.splice i, 1
 488                                 break
 489
 490 # pass a array of nodes (from parser library, ie it should have .el and .text)
 491 tree_dedup_space = (tree) ->
 492         prev = cur = next = null
 493         prev_i = cur_i = next_i = 0
 494         prev_pos = pos = next_pos = null
 495         prev_px = cur_px = next_px = null
 496         first = true
 497         removed_char = null
 498
 499         tree_remove_empty_text_nodes(tree)
 500
 501         iterate = (tree, cb) ->
 502                 for n in tree
 503                         if n.type is 'text'
 504                                 i = 0
 505                                 while i < n.text.length # don't foreach, cb might remove chars
 506                                         advance = cb n, i
 507                                         if advance
 508                                                 i += 1
 509                         if n.type is 'tag'
 510                                 block = is_display_block n.el
 511                                 if block
 512                                         cb null
 513                                 if n.children.length > 0
 514                                         iterate n.children, cb
 515                                 if block
 516                                         cb null
 517         # remove cur char
 518         remove = ->
 519                 removed_char = cur.text.charAt(cur_i)
 520                 cur.el.textContent = cur.text = (cur.text.substr 0, cur_i) + (cur.text.substr cur_i + 1)
 521                 if next is cur # in same text node
 522                         if next_i is 0
 523                                 throw "how is this possible?"
 524                         next_i -= 1
 525                 return true
 526         # undo remove()
 527         put_it_back = ->
 528                 cur.el.textContent = cur.text = (cur.text.substr 0, cur_i) + removed_char + (cur.text.substr cur_i)
 529                 if next is cur # in same text node
 530                         next_i += 1
 531                 return false
 532         # return true if cur was removed from the dom (ie re-use same prev)
 533         operate = ->
 534                 # cur definitately set
 535                 # prev and/or next might be null, indicating the start/end of a display:block
 536                 return false unless is_space_code cur.text.charCodeAt cur_i
 537                 bounds = text_range_bounds cur.el, cur_i, cur_i + 1
 538                 # consistent cases:
 539                 # 1. zero rects returned by getClientRects() means collapsed space
 540                 if bounds is null
 541                         return remove()
 542                 # 2. width greater than zero means visible space
 543                 if bounds.w > 0
 544                         return false
 545                 # now the weird edge cases...
 546                 #
 547                 # firefox and chromium both report zero width for characters at the end
 548                 # of a line where the text wraps (automatically, due to word-wrap) to
 549                 # the next line. These do not appear to be distinguishable from
 550                 # collapsed spaces via the range/bounds api, so...
 551                 #
 552                 # remove it from the dom, and if prev or next moves, put it back.
 553                 if prev? and not prev_px?
 554                         prev_px = cursor_to_xyh prev, prev_i
 555                 if next? and not next_px?
 556                         next_px = cursor_to_xyh next, next_i
 557                 #if prev is null and next is null
 558                 #       parent_px = cur.parent.el.getBoundingClientRect()
 559                 remove()
 560                 if prev?
 561                         if prev_px?
 562                                 new_prev_px = cursor_to_xyh prev, prev_i
 563                                 if new_prev_px.x isnt prev_px.x or new_prev_px.y isnt prev_px.y
 564                                         return put_it_back()
 565                         else
 566                                 console.log "this shouldn't happen, we remove spaces that don't locate"
 567                 if next?
 568                         if next_px?
 569                                 new_next_px = cursor_to_xyh next, next_i
 570                                 if new_next_px.x isnt next_px.x or new_next_px.y isnt next_px.y
 571                                         return put_it_back()
 572                         #else
 573                         #       console.log "removing space becase space after it is collapsed"
 574                 return true
 575         # pass null at start/end of display:block
 576         queue = (n, i) ->
 577                 next = n
 578                 next_i = i
 579                 next_px = null
 580                 advance = true
 581                 if cur?
 582                         removed = operate()
 583                         # don't advance (to the next character next time) if we removed a
 584                         # character from the same text node as ``next``, because doing so
 585                         # renumbers the indexes in that string
 586                         if removed and cur is next
 587                                 advance = false
 588                 else
 589                         removed = false
 590                 unless removed
 591                         prev = cur
 592                         prev_i = cur_i
 593                         prev_px = cur_px
 594                 cur = next
 595                 cur_i = next_i
 596                 cur_px = next_px
 597                 return advance
 598         queue null
 599         iterate tree, queue
 600         queue null
 601
 602         tree_remove_empty_text_nodes(tree)
 603
 604 class PeachHTML5Editor
 605         # Options: (all optional)
 606         #   editor_id: "id" attribute for outer-most element created by/for editor
 607         #   css_file: filename of a css file to style editable content
 608         #   on_init: callback for when the editable content is in place
 609         constructor: (in_el, options) ->
 610                 @options = options ? {}
 611                 @in_el = in_el
 612                 @tree = []
 613                 @matting = []
 614                 @inited = false # when iframes have loaded
 615                 @outer_iframe # iframe to hold editor
 616                 @outer_idoc # "document" object for @outer_iframe
 617                 @wrap2 = null # scrollbar is on this
 618                 @iframe = null # iframe to hold editable content
 619                 @idoc = null # "document" object for @iframe
 620                 @cursor = null
 621                 @cursor_el = null
 622                 @cursor_visible = false
 623                 @poll_for_blur_timeout = null
 624                 @iframe_offset = null
 625                 opt_fragment = @options.fragment ? true
 626                 @parser_opts = {}
 627                 if opt_fragment
 628                         @parser_opts.fragment = 'body'
 629
 630                 @outer_iframe = domify document, iframe: {}
 631                 outer_iframe_style = 'border: none !important; margin: 0 !important; padding: 0 !important; height: 100% !important; width: 100% !important;'
 632                 if @options.editor_id?
 633                         @outer_iframe.setAttribute 'id', @options.editor_id
 634                 @outer_iframe.onload = =>
 635                         @outer_idoc = @outer_iframe.contentDocument
 636                         icss = domify @outer_idoc, style: children: [
 637                                 domify @outer_idoc, text: css
 638                         ]
 639                         @outer_idoc.head.appendChild icss
 640                         @iframe = domify @outer_idoc, iframe: sandbox: 'allow-same-origin allow-scripts'
 641                         @iframe.onload = =>
 642                                 @init()
 643                         setTimeout (=> @init() unless @inited), 200 # firefox never fires this onload
 644                         @outer_idoc.body.appendChild(
 645                                 domify @outer_idoc, div: id: 'wrap1', children: [
 646                                         domify @outer_idoc, div: style: "position: absolute; top: 0; left: 1px; font-size: 10px", children: [ domify @outer_idoc, text: "Peach HTML5 Editor" ]
 647                                         @wrap2 = domify @outer_idoc, div: id: 'wrap2', children: [
 648                                                 domify @outer_idoc, div: id: 'wrap3', children: [
 649                                                         @iframe
 650                                                         @overlay = domify @outer_idoc, div: id: 'overlay'
 651                                                 ]
 652                                         ]
 653                                 ]
 654                         )
 655                 outer_wrap = domify document, div: class: 'peach_html5_editor'
 656                 @in_el.parentNode.appendChild outer_wrap
 657                 outer_bounds = get_el_bounds outer_wrap
 658                 if outer_bounds.w < 300
 659                         outer_bounds.w = 300
 660                 if outer_bounds.h < 300
 661                         outer_bounds.h = 300
 662                 outer_iframe_style += "width: #{outer_bounds.w}px; height: #{outer_bounds.h}px;"
 663                 @outer_iframe.setAttribute 'style', outer_iframe_style
 664                 css = outer_css w: outer_bounds.w, h: outer_bounds.h
 665                 outer_wrap.appendChild @outer_iframe
 666         init: -> # called by @iframe's onload (or timeout on firefox)
 667                 @idoc = @iframe.contentDocument
 668                 @overlay.onclick = (e) =>
 669                         @have_focus()
 670                         return event_return e, @onclick e
 671                 @overlay.ondoubleclick = (e) =>
 672                         @have_focus()
 673                         return event_return e, @ondoubleclick e
 674                 @outer_idoc.body.onkeyup = (e) =>
 675                         @have_focus()
 676                         return event_return e, @onkeyup e
 677                 @outer_idoc.body.onkeydown = (e) =>
 678                         @have_focus()
 679                         return event_return e, @onkeydown e
 680                 @outer_idoc.body.onkeypress = (e) =>
 681                         @have_focus()
 682                         return event_return e, @onkeypress e
 683                 # chromium doesn't resolve relative urls as though they were at the same domain
 684                 # so add a <base> tag
 685                 @idoc.head.appendChild domify @idoc, base: href: this_url_sans_path()
 686                 if @options.css_file
 687                         # TODO test this
 688                         @idoc.head.appendChild domify @idoc, link: rel: 'stylesheet', type: 'text/css', href: @options.css_file
 689                 @load_html @in_el.value
 690                 @inited = true
 691                 if @options.on_init?
 692                         @options.on_init()
 693         overlay_event_to_inner_xy: (e) ->
 694                 unless @iframe_offset?
 695                         @iframe_offset = get_el_bounds @iframe
 696                 x = e.pageX # TODO ?cross-browserify
 697                 y = e.pageY + @wrap2.scrollTop # TODO ?cross-browserify
 698                 # TODO adjust for scrolling
 699                 return x: x - @iframe_offset.x, y: y - @iframe_offset.y
 700         onclick: (e) ->
 701                 xy = @overlay_event_to_inner_xy e
 702                 new_cursor = find_loc_cursor_position @tree, xy
 703                 if new_cursor?
 704                         @move_cursor new_cursor
 705                 else
 706                         @kill_cursor()
 707                 return false
 708         ondoubleclick: (e) ->
 709                 return false
 710         onkeyup: (e) ->
 711                 return if e.ctrlKey
 712                 return false if ignore_key_codes[e.keyCode]?
 713                 #return false if control_key_codes[e.keyCode]?
 714         onkeydown: (e) ->
 715                 return if e.ctrlKey
 716                 return false if ignore_key_codes[e.keyCode]?
 717                 #return false if control_key_codes[e.keyCode]?
 718                 switch e.keyCode
 719                         when KEY_LEFT
 720                                 if @cursor?
 721                                         new_cursor = find_prev_cursor_position @tree, @cursor...
 722                                         if new_cursor?
 723                                                 @move_cursor new_cursor
 724                                 else
 725                                         for c in @tree
 726                                                 new_cursor = find_next_cursor_position @tree, c, -1
 727                                                 if new_cursor?
 728                                                         @move_cursor new_cursor
 729                                                         break
 730                                 return false
 731                         when KEY_UP
 732                                 return false
 733                         when KEY_RIGHT
 734                                 if @cursor?
 735                                         new_cursor = find_next_cursor_position @tree, @cursor...
 736                                         if new_cursor?
 737                                                 @move_cursor new_cursor
 738                                 else
 739                                         for c in @tree
 740                                                 new_cursor = find_prev_cursor_position @tree, c, -1
 741                                                 if new_cursor?
 742                                                         @move_cursor new_cursor
 743                                                         break
 744                                 return false
 745                         when KEY_DOWN
 746                                 return false
 747                         when KEY_END
 748                                 return false
 749                         when KEY_BACKSPACE
 750                                 return false unless @cursor?
 751                                 return false unless @cursor[1] > 0
 752                                 @cursor[0].text = @cursor[0].text.substr(0, @cursor[1] - 1) + @cursor[0].text.substr(@cursor[1])
 753                                 @cursor[0].el.nodeValue = @cursor[0].text
 754                                 @move_cursor [@cursor[0], @cursor[1] - 1]
 755                                 @changed()
 756                                 return false
 757                         when KEY_DELETE
 758                                 return false unless @cursor?
 759                                 return false unless @cursor[1] < @cursor[0].text.length
 760                                 @cursor[0].text = @cursor[0].text.substr(0, @cursor[1]) + @cursor[0].text.substr(@cursor[1] + 1)
 761                                 @cursor[0].el.nodeValue = @cursor[0].text
 762                                 @move_cursor [@cursor[0], @cursor[1]]
 763                                 @changed()
 764                                 return false
 765                         when KEY_ENTER
 766                                 return false
 767                         when KEY_ESCAPE
 768                                 return false
 769                         when KEY_HOME
 770                                 return false
 771                         when KEY_INSERT
 772                                 return false
 773                         when KEY_PAGE_UP
 774                                 return false
 775                         when KEY_PAGE_DOWN
 776                                 return false
 777                         when KEY_TAB
 778                                 return false
 779         onkeypress: (e) ->
 780                 return if e.ctrlKey
 781                 return false if ignore_key_codes[e.keyCode]?
 782                 # return false if control_key_codes[e.keyCode]? # handled in keydown
 783                 char = e.charCode ? e.keyCode
 784                 if char and @cursor?
 785                         char = String.fromCharCode char
 786                         if @cursor[1] is 0
 787                                 @cursor[0].text = char + @cursor[0].text
 788                         else if @cursor[1] is @cursor[0].text.length - 1
 789                                 @cursor[0].text += char
 790                         else
 791                                 @cursor[0].text =
 792                                         @cursor[0].text.substr(0, @cursor[1]) +
 793                                         char +
 794                                         @cursor[0].text.substr(@cursor[1])
 795                         @cursor[0].el.nodeValue = @cursor[0].text
 796                         @move_cursor [@cursor[0], @cursor[1] + 1]
 797                         @changed()
 798                 return false
 799         clear_dom: -> # remove all the editable content (and cursor, overlays, etc)
 800                 while @idoc.body.childNodes.length
 801                         @idoc.body.removeChild @idoc.body.childNodes[0]
 802                 @kill_cursor()
 803                 return
 804         load_html: (html) ->
 805                 @tree = peach_parser.parse html, @parser_opts
 806                 @clear_dom()
 807                 instantiate_tree @tree, @idoc.body
 808                 tree_dedup_space @tree
 809                 @changed()
 810         changed: ->
 811                 @in_el.onchange = null
 812                 @in_el.value = @pretty_html @tree
 813                 @in_el.onchange = =>
 814                         @load_html @in_el.value
 815                 @iframe.style.height = "0"
 816                 @iframe.style.height = "#{@idoc.body.scrollHeight}px"
 817         kill_cursor: -> # remove it, forget where it was
 818                 if @cursor_visible
 819                         @cursor_el.parentNode.removeChild @cursor_el
 820                         @cursor_visible = false
 821                 @cursor = null
 822                 @matt null
 823         move_cursor: (cursor) ->
 824                 loc = cursor_to_xyh cursor[0], cursor[1]
 825                 unless loc?
 826                         console.log "error: tried to move cursor to position that has no pixel location", cursor[0], cursor[1]
 827                         return
 828                 @cursor = cursor
 829                 # replace cursor element, to reset blink animation
 830                 if @cursor_visible
 831                         @cursor_el.parentNode.removeChild @cursor_el
 832                 @cursor_el = domify @outer_idoc, div: id: 'cursor'
 833                 @overlay.appendChild @cursor_el
 834                 @cursor_visible = true
 835                 @cursor_el.style.left = "#{loc.x + overlay_padding - 1}px"
 836                 if loc.h < 5
 837                         height = 12
 838                 else
 839                         height = loc.h
 840                 @cursor_el.style.top = "#{loc.y + overlay_padding + Math.round(height * .07)}px"
 841                 @cursor_el.style.height = "#{Math.round height * 0.82}px"
 842                 @matt cursor[0]
 843         matt: (n) ->
 844                 while @matting.length > 0
 845                         @overlay.removeChild @matting[0]
 846                         @matting.shift()
 847                 return unless n?
 848                 prev_bounds = x: 0, y: 0, w: 0, h: 0
 849                 alpha = 0.1
 850                 while n?.el?
 851                         if n.type is 'text'
 852                                 n = n.parent
 853                                 continue
 854                         bounds = get_el_bounds n.el
 855                         return unless bounds?
 856                         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
 857                                 n = n.parent
 858                                 continue
 859                         matt = 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});
 860                         @overlay.appendChild matt
 861                         @matting.push matt
 862                         ann = 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} "]
 863                         @overlay.appendChild ann
 864                         @matting.push ann
 865                         n = n.parent
 866                         alpha *= 1.5
 867         pretty_html: (tree, indent = '', parent_flags = pre_ish: false, block: true, want_nl: false) ->
 868                 ret = ''
 869                 want_nl = parent_flags.want_nl
 870                 prev_in_flow_is_text = false
 871                 prev_in_flow_is_block = false
 872                 for n, i in tree
 873                         # figure out flags
 874                         inner_flags = want_nl: true
 875                         is_br = false
 876                         switch n.type
 877                                 when 'tag'
 878                                         if n.name is 'br'
 879                                                 is_br = true
 880                                         is_text = false
 881                                         if n.el.currentStyle?
 882                                                 cs = n.el.currentStyle
 883                                                 whitespace = cs['white-space']
 884                                                 display = cs['display']
 885                                                 position = cs['position']
 886                                                 float = cs['float']
 887                                                 visibility = cs['visibility']
 888                                         else
 889                                                 cs = @iframe.contentWindow.getComputedStyle(n.el, null)
 890                                                 whitespace = cs.getPropertyValue 'white-space'
 891                                                 display = cs.getPropertyValue 'display'
 892                                                 position = cs.getPropertyValue 'position'
 893                                                 float = cs.getPropertyValue 'float'
 894                                                 visibility = cs.getPropertyValue 'visibility'
 895                                         if n.name is 'textarea'
 896                                                 inner_flags.pre_ish = true
 897                                         else
 898                                                 inner_flags.pre_ish = whitespace.substr(0, 3) is 'pre'
 899                                         switch float
 900                                                 when 'left', 'right'
 901                                                         in_flow = false
 902                                                 else
 903                                                         switch position
 904                                                                 when 'absolute', 'fixed'
 905                                                                         in_flow = false
 906                                                                 else
 907                                                                         if 'display' is 'none'
 908                                                                                 in_flow = false
 909                                                                         else
 910                                                                                 switch visibility
 911                                                                                         when 'hidden', 'collapse'
 912                                                                                                 in_flow = false
 913                                                                                         else # visible
 914                                                                                                 in_flow = true
 915                                         switch display
 916                                                 when 'inline', 'none'
 917                                                         inner_flags.block = false
 918                                                         is_block = in_flow_block = false
 919                                                 when 'inline-black'
 920                                                         inner_flags.block = true
 921                                                         is_block = in_flow_block = false
 922                                                 else # block, table, etc
 923                                                         inner_flags.block = true
 924                                                         is_block = true
 925                                                         in_flow_block = in_flow
 926                                 when 'text'
 927                                         is_text = true
 928                                         is_block = false
 929                                         in_flow = true
 930                                         in_flow_block = false
 931                                 else # 'comment', 'doctype'
 932                                         is_text = false
 933                                         is_block = false
 934                                         in_flow = false
 935                                         in_flow_block = false
 936                         # print whitespace if we can
 937                         unless parent_flags.pre_ish
 938                                 unless prev_in_flow_is_text and is_br
 939                                         if (i is 0 and parent_flags.block) or in_flow_block or prev_in_flow_is_block
 940                                                 if want_nl
 941                                                         ret += "\n"
 942                                                 ret += indent
 943                         switch n.type
 944                                 when 'tag'
 945                                         ret += '<' + n.name
 946                                         attr_keys = []
 947                                         for k of n.attrs
 948                                                 attr_keys.unshift k
 949                                         #attr_keys.sort()
 950                                         for k in attr_keys
 951                                                 ret += " #{k}"
 952                                                 if n.attrs[k].length > 0
 953                                                         ret += "=\"#{enc_attr n.attrs[k]}\""
 954                                         ret += '>'
 955                                         unless void_elements[n.name]?
 956                                                 if inner_flags.block
 957                                                         next_indent = indent + '    '
 958                                                 else
 959                                                         next_indent = indent
 960                                                 if n.children.length
 961                                                         ret += @pretty_html n.children, next_indent, inner_flags
 962                                                 ret += "</#{n.name}>"
 963                                 when 'text'
 964                                         ret += enc_text n.text
 965                                 when 'comment'
 966                                         ret += "<!--#{n.text}-->" # TODO encode?
 967                                 when 'doctype'
 968                                         ret += "<!DOCTYPE #{n.name}"
 969                                         if n.public_identifier? and n.public_identifier.length > 0
 970                                                 ret += " \"#{n.public_identifier}\""
 971                                         if n.system_identifier? and n.system_identifier.length > 0
 972                                                 ret += " \"#{n.system_identifier}\""
 973                                         ret += ">"
 974                         want_nl = true
 975                         if in_flow
 976                                 prev_in_flow_is_text = is_text
 977                                 prev_in_flow_is_block = is_block or (in_flow and is_br)
 978                 if tree.length
 979                         # output final newline if allowed
 980                         unless parent_flags.pre_ish
 981                                 if prev_in_flow_is_block or parent_flags.block
 982                                         ret += "\n#{indent.substr 4}"
 983                 return ret
 984         onblur: ->
 985                 @kill_cursor()
 986         have_focus: ->
 987                 @editor_is_focused = true
 988                 @poll_for_blur()
 989         poll_for_blur: ->
 990                 return if @poll_for_blur_timeout? # already polling
 991                 @poll_for_blur_timeout = timeout 150, =>
 992                         next_frame => # pause polling when browser knows we're not active/visible/etc.
 993                                 @poll_for_blur_timeout = null
 994                                 if document.activeElement is @outer_iframe
 995                                         @poll_for_blur()
 996                                 else
 997                                         @editor_is_focused = false
 998                                         @onblur()
 999
1000 window.peach_html5_editor = (args...) ->
1001         return new PeachHTML5Editor args...
1002
1003 # test in browser: peach_html5_editor(document.getElementsByTagName('textarea')[0])