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 TYPE_TAG = peach_parser.TYPE_TAG
  18 TYPE_TEXT = peach_parser.TYPE_TEXT
  19 TYPE_COMMENT = peach_parser.TYPE_COMMENT
  20 TYPE_DOCTYPE = peach_parser.TYPE_DOCTYPE
  21
  22 debug_dot_at = (doc, x, y) ->
  23         el = doc.createElement 'div'
  24         el.setAttribute 'style', "position: absolute; left: #{x}px; top: #{y}px; width: 1px; height: 3px; background-color: red"
  25         doc.body.appendChild el
  26         #console.log(new Error().stack)
  27
  28 # text nodes don't have getBoundingClientRect(), so use selection api to find
  29 # it.
  30 get_el_bounds = (el) ->
  31         if el.getBoundingClientRect?
  32                 rect = el.getBoundingClientRect()
  33         else
  34                 # text nodes don't have getBoundingClientRect(), so use range api
  35                 range = el.ownerDocument.createRange()
  36                 range.selectNodeContents el
  37                 rect = range.getBoundingClientRect()
  38         doc = el.ownerDocument.documentElement
  39         win = el.ownerDocument.defaultView
  40         y_fix = win.pageYOffset - doc.clientTop
  41         x_fix = win.pageXOffset - doc.clientLeft
  42         return {
  43                 x: rect.left + x_fix
  44                 y: rect.top + y_fix
  45                 w: rect.width ? (rect.right - rect.left)
  46                 h: rect.height ? (rect.top - rect.bottom)
  47         }
  48
  49 is_display_block = (el) ->
  50         if el.currentStyle?
  51                 return el.currentStyle.display is 'block'
  52         else
  53                 return window.getComputedStyle(el, null).getPropertyValue('display') is 'block'
  54
  55 # Warning: currently assumes you're asking about a single character
  56 # Note: chromium returns multiple bounding rects for a space at a line-break
  57 # Note: chromium's getBoundingClientRect() is broken (when zero-area client rects)
  58 # Note: sometimes returns null (eg for whitespace that is not visible)
  59 text_range_bounds = (el, start, end) ->
  60         range = document.createRange()
  61         range.setStart el, start
  62         range.setEnd el, end
  63         rects = range.getClientRects()
  64         if rects.length > 0
  65                 rect = rects[0]
  66         else
  67                 return null
  68         doc = el.ownerDocument.documentElement
  69         win = el.ownerDocument.defaultView
  70         y_fix = win.pageYOffset - doc.clientTop
  71         x_fix = win.pageXOffset - doc.clientLeft
  72         return {
  73                 x: rect.left + x_fix
  74                 y: rect.top + y_fix
  75                 w: rect.width ? (rect.right - rect.left)
  76                 h: rect.height ? (rect.top - rect.bottom)
  77                 rects: rects
  78                 bounding: range.getBoundingClientRect()
  79         }
  80
  81 # figure out the x/y coordinates of where the cursor should be if it's at
  82 # position ``i`` within text node ``n``
  83 # sometimes returns null (eg for whitespace that is not visible)
  84 window.cursor_to_xyh = cursor_to_xyh = (n, i) ->
  85         range = document.createRange()
  86         if n.text.length is 0
  87                 ret = text_range_bounds n.el, 0, 0
  88         if i is n.text.length
  89                 ret = text_range_bounds n.el, i - 1, i
  90                 if ret?
  91                         ret.x += ret.w
  92         else
  93                 ret = text_range_bounds n.el, i, i + 1
  94         if ret?
  95                 debug_dot_at n.el.ownerDocument, ret.x, ret.y
  96         return ret
  97
  98 # encode text so it can be safely placed inside an html attribute
  99 enc_attr_regex = new RegExp '(&)|(")|(\u00A0)', 'g'
 100 enc_attr = (txt) ->
 101         return txt.replace enc_attr_regex, (match, amp, quote) ->
 102                 return '&amp;' if (amp)
 103                 return '&quot;' if (quote)
 104                 return '&nbsp;'
 105 enc_text_regex = new RegExp '(&)|(<)|(\u00A0)', 'g'
 106 enc_text = (txt) ->
 107         return txt.replace enc_text_regex, (match, amp, lt) ->
 108                 return '&amp;' if (amp)
 109                 return '&lt;' if (lt)
 110                 return '&nbsp;'
 111
 112 void_elements = {
 113         area: true
 114         base: true
 115         br: true
 116         col: true
 117         embed: true
 118         hr: true
 119         img: true
 120         input: true
 121         keygen: true
 122         link: true
 123         meta: true
 124         param: true
 125         source: true
 126         track: true
 127         wbr: true
 128 }
 129 dom_to_html = (dom) ->
 130         ret = ''
 131         for el in dom
 132                 switch el.type
 133                         when TYPE_TAG
 134                                 ret += '<' + el.name
 135                                 attr_keys = []
 136                                 for k of el.attrs
 137                                         attr_keys.unshift k
 138                                 #attr_keys.sort()
 139                                 for k in attr_keys
 140                                         ret += " #{k}"
 141                                         if el.attrs[k].length > 0
 142                                                 ret += "=\"#{enc_attr el.attrs[k]}\""
 143                                 ret += '>'
 144                                 unless void_elements[el.name]
 145                                         if el.children.length
 146                                                 ret += dom_to_html el.children
 147                                         ret += "</#{el.name}>"
 148                         when TYPE_TEXT
 149                                 ret += enc_text el.text
 150                         when TYPE_COMMENT
 151                                 ret += "<!--#{el.text}-->"
 152                         when TYPE_DOCTYPE
 153                                 ret += "<!DOCTYPE #{el.name}"
 154                                 if el.public_identifier? and el.public_identifier.length > 0
 155                                         ret += " \"#{el.public_identifier}\""
 156                                 if el.system_identifier? and el.system_identifier.length > 0
 157                                         ret += " \"#{el.system_identifier}\""
 158                                 ret += ">\n"
 159         return ret
 160
 161 domify = (h) ->
 162         for tag, attrs of h
 163                 if tag is 'text'
 164                         return document.createTextNode attrs
 165                 el = document.createElement tag
 166                 for k, v of attrs
 167                         if k is 'children'
 168                                 for child in v
 169                                         el.appendChild child
 170                         else
 171                                 el.setAttribute k, v
 172         return el
 173
 174 css = ''
 175 css += 'div#peach_html5_editor_cursor {'
 176 css +=     'position: absolute;'
 177 css +=     'height: 1em;'
 178 css +=     'width: 2px;'
 179 css +=     'margin-left: -1px;'
 180 css +=     'margin-right: -1px;'
 181 css +=     'background: #444;'
 182 css +=     '-webkit-animation: blink 1s steps(2, start) infinite;'
 183 css +=     'animation: blink 1s steps(2, start) infinite;'
 184 css += '}'
 185 css += '@-webkit-keyframes blink {'
 186 css +=     'to { visibility: hidden; }'
 187 css += '}'
 188 css += '@keyframes blink {'
 189 css +=     'to { visibility: hidden; }'
 190 css += '}'
 191
 192 # key codes:
 193 KEY_LEFT = 37
 194 KEY_UP = 38
 195 KEY_RIGHT = 39
 196 KEY_DOWN = 40
 197 KEY_BACKSPACE = 8 # <--
 198 KEY_DELETE = 46 # -->
 199 KEY_END = 35
 200 KEY_ENTER = 13
 201 KEY_ESCAPE = 27
 202 KEY_HOME = 36
 203 KEY_INSERT = 45
 204 KEY_PAGE_UP = 33
 205 KEY_PAGE_DOWN = 34
 206 KEY_TAB = 9
 207
 208 instantiate_tree = (tree, parent) ->
 209         for c in tree
 210                 switch c.type
 211                         when TYPE_TEXT
 212                                 c.el = parent.ownerDocument.createTextNode c.text
 213                                 parent.appendChild c.el
 214                         when TYPE_TAG
 215                                 # TODO create in correct namespace
 216                                 c.el = parent.ownerDocument.createElement c.name
 217                                 for k, v of c.attrs
 218                                         # FIXME if attr_whitelist[k]?
 219                                         c.el.setAttribute k, v
 220                                 parent.appendChild c.el
 221                                 if c.children.length
 222                                         instantiate_tree c.children, c.el
 223
 224 traverse_tree = (tree, state, cb) ->
 225         for c in tree
 226                 cb c, state
 227                 break if state.done?
 228                 if c.children.length
 229                         traverse_tree c.children, state, cb
 230                         break if state.done?
 231         return state
 232 # find the next element in tree (and decendants) that is after n and can contain text
 233 # TODO make it so cursor can go places that don't have text but could
 234 find_next_cursor_position = (tree, n, i) ->
 235         if n? and n.type is TYPE_TEXT and n.text.length > i
 236                 orig_xyh = cursor_to_xyh n, i
 237                 unless orig_xyh?
 238                         console.log "ERROR: couldn't find xy for current cursor location"
 239                         return
 240                 for next_i in [i+1 .. n.text.length] # inclusive is valid (after last char)
 241                         next_xyh = cursor_to_xyh n, next_i
 242                         if next_xyh?
 243                                 if next_xyh.x > orig_xyh.x or next_xyh.y > orig_xyh.y
 244                                         return [n, next_i]
 245         found = traverse_tree tree, before: n?, (node, state) ->
 246                 if node.type is TYPE_TEXT and state.before is false
 247                         state.node = node
 248                         state.done = true
 249                 if node is n
 250                         state.before = false
 251         if found.node?
 252                 return [found.node, 0]
 253         return null
 254
 255 # TODO make it so cursor can go places that don't have text but could
 256 find_prev_cursor_position = (tree, n, i) ->
 257         if n? and n.type is TYPE_TEXT and i > 0
 258                 orig_xyh = cursor_to_xyh n, i
 259                 unless orig_xyh?
 260                         console.log "ERROR: couldn't find xy for current cursor location"
 261                         return
 262                 for prev_i in [i-1 .. 0]
 263                         prev_xyh = cursor_to_xyh n, prev_i
 264                         if prev_xyh?
 265                                 if prev_xyh.x < orig_xyh.x or prev_xyh.y < orig_xyh.y
 266                                         return [n, prev_i]
 267                 return [n, i - 1]
 268         found = traverse_tree tree, before: n?, (node, state) ->
 269                 if node.type is TYPE_TEXT
 270                         unless n?
 271                                 state.node = node
 272                                 state.done = true
 273                         if node is n
 274                                 if state.prev?
 275                                         state.node = state.prev
 276                                 state.done = true
 277                         if node
 278                                 state.prev = node
 279         if found.node?
 280                 return [found.node, found.node.text.length]
 281         return null
 282
 283 find_loc_cursor_position = (tree, loc) ->
 284         for c in tree
 285                 if c.type is TYPE_TAG or c.type is TYPE_TEXT
 286                         bounds = get_el_bounds c.el
 287                         continue if loc.x < bounds.x
 288                         continue if loc.x > bounds.x + bounds.w
 289                         continue if loc.y < bounds.y
 290                         continue if loc.y > bounds.y + bounds.h
 291                         if c.children.length
 292                                 ret = find_loc_cursor_position c.children, loc
 293                                 return ret if ret?
 294                         if c.type is TYPE_TEXT
 295                                 # click is within bounding box that contains all text.
 296                                 return [c, 0] if c.text.length is 0
 297                                 before_i = 0
 298                                 before = cursor_to_xyh c, before_i
 299                                 unless before?
 300                                         console.log "error: failed to find cursor pixel location for start of", c
 301                                         return
 302                                 after_i = c.text.length
 303                                 after = cursor_to_xyh c, after_i
 304                                 unless after?
 305                                         console.log "error: failed to find cursor pixel location for end of", c
 306                                         return
 307                                 if loc.y < before.y + before.h and loc.x < before.x
 308                                         # console.log 'before first char on first line'
 309                                         continue
 310                                 if loc.y > after.y and loc.x > after.x
 311                                         # console.log 'after last char on last line'
 312                                         continue
 313                                 if loc.y < before.y
 314                                         console.log "Warning: click in bounding box but above first line"
 315                                         continue # above first line (runaround?)
 316                                 if loc.y > after.y + after.h
 317                                         console.log "Warning: click in bounding box but below last line", loc.y, after.y, after.h
 318                                         continue # below last line (shouldn't happen?)
 319                                 while after_i - before_i > 1
 320                                         cur_i = Math.round((before_i + after_i) / 2)
 321                                         cur = cursor_to_xyh c, cur_i
 322                                         unless loc?
 323                                                 console.log "error: failed to find cursor pixel location for", c, cur_i
 324                                                 return
 325                                         if loc.y < cur.y or (loc.y <= cur.y + cur.h and loc.x < cur.x)
 326                                                 after_i = cur_i
 327                                                 after = cur
 328                                         else
 329                                                 before_i = cur_i
 330                                                 before = cur
 331                                 # which one is closest?
 332                                 if Math.abs(before.x - loc.x) < Math.abs(after.x - loc.x)
 333                                         return [c, before_i]
 334                                 else
 335                                         return [c, after_i]
 336         return null
 337
 338 # browsers collapse these (html5 spec calls these "space characters")
 339 is_space_code = (char_code) ->
 340         switch char_code
 341                 when 9, 10, 12, 13, 32
 342                         return true
 343         return false
 344 is_space = (chr) ->
 345         return is_space_code chr.charCodeAt 0
 346
 347 # pass a array of nodes (from parser library, ie it should have .el and .text)
 348 tree_dedup_space = (tree) ->
 349         prev = cur = next = null
 350         prev_i = cur_i = next_i = 0
 351         prev_pos = pos = next_pos = null
 352         prev_px = cur_px = next_px = null
 353         first = true
 354         removed_char = null
 355
 356         iterate = (tree, cb) ->
 357                 for n in tree
 358                         if n.type is TYPE_TEXT
 359                                 i = 0
 360                                 while i < n.text.length # don't foreach, cb might remove chars
 361                                         advance = cb n, i
 362                                         if advance
 363                                                 i += 1
 364                         if n.type is TYPE_TAG
 365                                 block = is_display_block n.el
 366                                 if block
 367                                         cb null
 368                                 if n.children.length > 0
 369                                         iterate n.children, cb
 370                                 if block
 371                                         cb null
 372         # remove cur char
 373         remove = ->
 374                 removed_char = cur.text.charAt(cur_i)
 375                 cur.el.textContent = cur.text = (cur.text.substr 0, cur_i) + (cur.text.substr cur_i + 1)
 376                 if next is cur # in same text node
 377                         if next_i is 0
 378                                 throw "how is this possible?"
 379                         next_i -= 1
 380                 return true
 381         # undo remove()
 382         put_it_back = ->
 383                 cur.el.textContent = cur.text = (cur.text.substr 0, cur_i) + removed_char + (cur.text.substr cur_i)
 384                 if next is cur # in same text node
 385                         next_i += 1
 386                 return false
 387         # return true if cur was removed from the dom (ie re-use same prev)
 388         operate = ->
 389                 # cur definitately set
 390                 # prev and/or next might be null, indicating the start/end of a display:block
 391                 return false unless is_space_code cur.text.charCodeAt cur_i
 392                 bounds = text_range_bounds cur.el, cur_i, cur_i + 1
 393                 # consistent cases:
 394                 # 1. zero rects returned by getClientRects() means collapsed space
 395                 if bounds is null
 396                         return remove()
 397                 # 2. width greater than zero means visible space
 398                 if bounds.w > 0
 399                         return false
 400                 # now the weird edge cases...
 401                 #
 402                 # firefox and chromium both report zero width for characters at the end
 403                 # of a line where the text wraps (automatically, due to word-wrap) to
 404                 # the next line. These do not appear to be distinguishable from
 405                 # collapsed spaces via the range/bounds api, so...
 406                 #
 407                 # remove it from the dom, and if prev or next moves, put it back.
 408                 if prev? and not prev_px?
 409                         prev_px = cursor_to_xyh prev, prev_i
 410                 if next? and not next_px?
 411                         next_px = cursor_to_xyh next, next_i
 412                 #if prev is null and next is null
 413                 #       parent_px = cur.parent.el.getBoundingClientRect()
 414                 remove()
 415                 if prev?
 416                         if prev_px?
 417                                 new_prev_px = cursor_to_xyh prev, prev_i
 418                                 if new_prev_px.x isnt prev_px.x or new_prev_px.y isnt prev_px.y
 419                                         return put_it_back()
 420                         else
 421                                 console.log "this shouldn't happen, we remove spaces that don't locate"
 422                 if next?
 423                         if next_px?
 424                                 new_next_px = cursor_to_xyh next, next_i
 425                                 if new_next_px.x isnt next_px.x or new_next_px.y isnt next_px.y
 426                                         return put_it_back()
 427                         #else
 428                         #       console.log "removing space becase space after it is collapsed"
 429                 # if there's no prev or next (single space inside a block-level element?) check
 430                 # TODO scrapt this, or fix it so it works when there's no parent
 431                 # if prev is null and next is null
 432                 #       new_parent_px = cur.parent.el.getBoundingClientRect()
 433                 #       if new_parent_px.left isnt parent_px.left or new_parent_px.top isnt parent_px.top or new_parent_px.right isnt parent_px.right or new_parent_px.bottom isnt parent_px.bottom
 434                 #               console.log "WEIRD: parent moved"
 435                 #               return put_it_back()
 436                 # we didn't put it back
 437                 return true
 438         # pass null at start/end of display:block
 439         queue = (n, i) ->
 440                 next = n
 441                 next_i = i
 442                 next_px = null
 443                 advance = true
 444                 if cur?
 445                         removed = operate()
 446                         # don't advance (to the next character next time) if we removed a
 447                         # character from the same text node as ``next``, because doing so
 448                         # renumbers the indexes in that string
 449                         if removed and cur is next
 450                                 advance = false
 451                 else
 452                         removed = false
 453                 unless removed
 454                         prev = cur
 455                         prev_i = cur_i
 456                         prev_px = cur_px
 457                 cur = next
 458                 cur_i = next_i
 459                 cur_px = next_px
 460                 return advance
 461         queue null
 462         iterate tree, queue
 463         queue null
 464
 465 class PeachHTML5Editor
 466         constructor: (in_el, options = {}) ->
 467                 @in_el = in_el
 468                 @tree = []
 469                 @iframe = domify iframe: class: 'peach_html5_editor'
 470                 @cursor = null
 471                 @cursor_el = null
 472                 @cursor_visible = false
 473                 opt_fragment = options.fragment ? true
 474                 @parser_opts = {}
 475                 if opt_fragment
 476                         @parser_opts.fragment = 'body'
 477
 478                 @iframe.onload = =>
 479                         @idoc = @iframe.contentDocument
 480
 481                         ignore_key_codes =
 482                                 '18': true # alt
 483                                 '20': true # capslock
 484                                 '17': true # ctrl
 485                                 '144': true # numlock
 486                                 '16': true # shift
 487                                 '91': true # windows "start" key
 488                         control_key_codes = # we react to these, but they aren't typing
 489                                 '37': KEY_LEFT
 490                                 '38': KEY_UP
 491                                 '39': KEY_RIGHT
 492                                 '40': KEY_DOWN
 493                                 '35': KEY_END
 494                                 '8':  KEY_BACKSPACE
 495                                 '46': KEY_DELETE
 496                                 '13': KEY_ENTER
 497                                 '27': KEY_ESCAPE
 498                                 '36': KEY_HOME
 499                                 '45': KEY_INSERT
 500                                 '33': KEY_PAGE_UP
 501                                 '34': KEY_PAGE_DOWN
 502                                 '9':  KEY_TAB
 503
 504                         @idoc.body.onclick = (e) =>
 505                                 # idoc.body.offset().left/top
 506                                 new_cursor = find_loc_cursor_position @tree, x: e.pageX, y: e.pageY
 507                                 if new_cursor?
 508                                         @move_cursor new_cursor
 509                         @idoc.body.onkeyup = (e) =>
 510                                 return if e.ctrlKey
 511                                 return false if ignore_key_codes[e.keyCode]?
 512                                 #return false if control_key_codes[e.keyCode]?
 513                         @idoc.body.onkeydown = (e) =>
 514                                 return if e.ctrlKey
 515                                 return false if ignore_key_codes[e.keyCode]?
 516                                 #return false if control_key_codes[e.keyCode]?
 517                                 switch e.keyCode
 518                                         when KEY_LEFT
 519                                                 if @cursor?
 520                                                         new_cursor = find_prev_cursor_position @tree, @cursor...
 521                                                         if new_cursor?
 522                                                                 @move_cursor new_cursor
 523                                                 else
 524                                                         for c in @tree
 525                                                                 new_cursor = find_next_cursor_position @tree, c, -1
 526                                                                 if new_cursor?
 527                                                                         @move_cursor new_cursor
 528                                                                         break
 529                                                 return false
 530                                         when KEY_UP
 531                                                 return false
 532                                         when KEY_RIGHT
 533                                                 if @cursor?
 534                                                         new_cursor = find_next_cursor_position @tree, @cursor...
 535                                                         if new_cursor?
 536                                                                 @move_cursor new_cursor
 537                                                 else
 538                                                         for c in @tree
 539                                                                 new_cursor = find_prev_cursor_position @tree, c, -1
 540                                                                 if new_cursor?
 541                                                                         @move_cursor new_cursor
 542                                                                         break
 543                                                 return false
 544                                         when KEY_DOWN
 545                                                 return false
 546                                         when KEY_END
 547                                                 return false
 548                                         when KEY_BACKSPACE
 549                                                 return false unless @cursor?
 550                                                 return false unless @cursor[1] > 0
 551                                                 @cursor[0].text = @cursor[0].text.substr(0, @cursor[1] - 1) + @cursor[0].text.substr(@cursor[1])
 552                                                 @cursor[0].el.nodeValue = @cursor[0].text
 553                                                 @move_cursor [@cursor[0], @cursor[1] - 1]
 554                                                 return false
 555                                         when KEY_DELETE
 556                                                 return false unless @cursor?
 557                                                 return false unless @cursor[1] < @cursor[0].text.length
 558                                                 @cursor[0].text = @cursor[0].text.substr(0, @cursor[1]) + @cursor[0].text.substr(@cursor[1] + 1)
 559                                                 @cursor[0].el.nodeValue = @cursor[0].text
 560                                                 @move_cursor [@cursor[0], @cursor[1]]
 561                                                 return false
 562                                         when KEY_ENTER
 563                                                 return false
 564                                         when KEY_ESCAPE
 565                                                 return false
 566                                         when KEY_HOME
 567                                                 return false
 568                                         when KEY_INSERT
 569                                                 return false
 570                                         when KEY_PAGE_UP
 571                                                 return false
 572                                         when KEY_PAGE_DOWN
 573                                                 return false
 574                                         when KEY_TAB
 575                                                 return false
 576                         @idoc.body.onkeypress = (e) =>
 577                                 return if e.ctrlKey
 578                                 return false if ignore_key_codes[e.keyCode]?
 579                                 return false if control_key_codes[e.keyCode]? # handled in keydown
 580                                 char = e.charCode ? e.keyCode
 581                                 if char and @cursor?
 582                                         char = String.fromCharCode char
 583                                         if @cursor[1] is 0
 584                                                 @cursor[0].text = char + @cursor[0].text
 585                                         else if @cursor[1] is @cursor[0].text.length - 1
 586                                                 @cursor[0].text += char
 587                                         else
 588                                                 @cursor[0].text =
 589                                                         @cursor[0].text.substr(0, @cursor[1]) +
 590                                                         char +
 591                                                         @cursor[0].text.substr(@cursor[1])
 592                                         @cursor[0].el.nodeValue = @cursor[0].text
 593                                         @move_cursor [@cursor[0], @cursor[1] + 1]
 594                                         @changed()
 595                                 return false
 596                         if options.stylesheet # TODO test this
 597                                 istyle = @idoc.createElement 'style'
 598                                 istyle.setAttribute 'src', options.stylesheet
 599                                 @idoc.head.appendChild istyle
 600                         icss = @idoc.createElement 'style'
 601                         icss.appendChild @idoc.createTextNode css
 602                         @idoc.head.appendChild icss
 603                         @load_html @in_el.value
 604
 605                 @in_el.parentNode.appendChild @iframe
 606         clear_dom: ->
 607                 # FIXME add parent node, so we don't empty body and delete cursor_el
 608                 while @idoc.body.childNodes.length
 609                         @idoc.body.removeChild @idoc.body.childNodes[0]
 610                 @cursor_visible = false
 611                 return
 612         load_html: (html) ->
 613                 @tree = peach_parser.parse html, @parser_opts
 614                 @clear_dom()
 615                 instantiate_tree @tree, @idoc.body
 616                 tree_dedup_space @tree
 617                 @changed()
 618         changed: ->
 619                 # FIXME don't export cursor placeholder (when cursor is between space characters)
 620                 @in_el.onchange = null
 621                 @in_el.value = dom_to_html @tree
 622                 @in_el.onchange = =>
 623                         @load_html @in_el.value
 624         move_cursor: (cursor) ->
 625                 loc = cursor_to_xyh cursor[0], cursor[1]
 626                 unless loc?
 627                         console.log "error: tried to move cursor to position that has no pixel location", cursor[0], cursor[1]
 628                         return
 629                 @cursor = cursor
 630                 # replace cursor, to reset blink animation
 631                 if @cursor_visible
 632                         @cursor_el.parentNode.removeChild @cursor_el
 633                 @cursor_el = domify div: id: 'peach_html5_editor_cursor'
 634                 @idoc.body.appendChild @cursor_el
 635                 @cursor_visible = true
 636                 # TODO figure out x,y coords for cursor
 637                 @cursor_el.style.left = "#{loc.x}px"
 638                 @cursor_el.style.top = "#{loc.y}px"
 639
 640 window.peach_html5_editor = (args...) ->
 641         return new PeachHTML5Editor args...
 642
 643 # test in browser: peach_html5_editor(document.getElementsByTagName('textarea')[0])