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 = 6 # TODO generate css from this
  19
  20 TYPE_TAG = peach_parser.TYPE_TAG
  21 TYPE_TEXT = peach_parser.TYPE_TEXT
  22 TYPE_COMMENT = peach_parser.TYPE_COMMENT
  23 TYPE_DOCTYPE = peach_parser.TYPE_DOCTYPE
  24
  25 debug_dot_at = (doc, x, y) ->
  26         el = doc.createElement 'div'
  27         el.setAttribute 'style', "position: absolute; left: #{x}px; top: #{y}px; width: 1px; height: 3px; background-color: red"
  28         doc.body.appendChild el
  29         #console.log(new Error().stack)
  30
  31 # text nodes don't have getBoundingClientRect(), so use selection api to find
  32 # it.
  33 get_el_bounds = (el) ->
  34         if el.getBoundingClientRect?
  35                 rect = el.getBoundingClientRect()
  36         else
  37                 # text nodes don't have getBoundingClientRect(), so use range api
  38                 range = el.ownerDocument.createRange()
  39                 range.selectNodeContents el
  40                 rect = range.getBoundingClientRect()
  41         doc = el.ownerDocument.documentElement
  42         win = el.ownerDocument.defaultView
  43         y_fix = win.pageYOffset - doc.clientTop
  44         x_fix = win.pageXOffset - doc.clientLeft
  45         return {
  46                 x: rect.left + x_fix
  47                 y: rect.top + y_fix
  48                 w: rect.width ? (rect.right - rect.left)
  49                 h: rect.height ? (rect.top - rect.bottom)
  50         }
  51
  52 is_display_block = (el) ->
  53         if el.currentStyle?
  54                 return el.currentStyle.display is 'block'
  55         else
  56                 return window.getComputedStyle(el, null).getPropertyValue('display') is 'block'
  57
  58 # Warning: currently assumes you're asking about a single character
  59 # Note: chromium returns multiple bounding rects for a space at a line-break
  60 # Note: chromium's getBoundingClientRect() is broken (when zero-area client rects)
  61 # Note: sometimes returns null (eg for whitespace that is not visible)
  62 text_range_bounds = (el, start, end) ->
  63         range = document.createRange()
  64         range.setStart el, start
  65         range.setEnd el, end
  66         rects = range.getClientRects()
  67         if rects.length > 0
  68                 rect = rects[0]
  69         else
  70                 return null
  71         doc = el.ownerDocument.documentElement
  72         win = el.ownerDocument.defaultView
  73         y_fix = win.pageYOffset - doc.clientTop
  74         x_fix = win.pageXOffset - doc.clientLeft
  75         return {
  76                 x: rect.left + x_fix
  77                 y: rect.top + y_fix
  78                 w: rect.width ? (rect.right - rect.left)
  79                 h: rect.height ? (rect.top - rect.bottom)
  80                 rects: rects
  81                 bounding: range.getBoundingClientRect()
  82         }
  83
  84 # figure out the x/y coordinates of where the cursor should be if it's at
  85 # position ``i`` within text node ``n``
  86 # sometimes returns null (eg for whitespace that is not visible)
  87 window.cursor_to_xyh = cursor_to_xyh = (n, i) ->
  88         range = document.createRange()
  89         if n.text.length is 0
  90                 ret = text_range_bounds n.el, 0, 0
  91         if i is n.text.length
  92                 ret = text_range_bounds n.el, i - 1, i
  93                 if ret?
  94                         ret.x += ret.w
  95         else
  96                 ret = text_range_bounds n.el, i, i + 1
  97         if ret?
  98                 debug_dot_at n.el.ownerDocument, ret.x, ret.y
  99         return ret
 100
 101 # encode text so it can be safely placed inside an html attribute
 102 enc_attr_regex = new RegExp '(&)|(")|(\u00A0)', 'g'
 103 enc_attr = (txt) ->
 104         return txt.replace enc_attr_regex, (match, amp, quote) ->
 105                 return '&amp;' if (amp)
 106                 return '&quot;' if (quote)
 107                 return '&nbsp;'
 108 enc_text_regex = new RegExp '(&)|(<)|(\u00A0)', 'g'
 109 enc_text = (txt) ->
 110         return txt.replace enc_text_regex, (match, amp, lt) ->
 111                 return '&amp;' if (amp)
 112                 return '&lt;' if (lt)
 113                 return '&nbsp;'
 114
 115 void_elements = {
 116         area: true
 117         base: true
 118         br: true
 119         col: true
 120         embed: true
 121         hr: true
 122         img: true
 123         input: true
 124         keygen: true
 125         link: true
 126         meta: true
 127         param: true
 128         source: true
 129         track: true
 130         wbr: true
 131 }
 132 dom_to_html = (dom) ->
 133         ret = ''
 134         for el in dom
 135                 switch el.type
 136                         when TYPE_TAG
 137                                 ret += '<' + el.name
 138                                 attr_keys = []
 139                                 for k of el.attrs
 140                                         attr_keys.unshift k
 141                                 #attr_keys.sort()
 142                                 for k in attr_keys
 143                                         ret += " #{k}"
 144                                         if el.attrs[k].length > 0
 145                                                 ret += "=\"#{enc_attr el.attrs[k]}\""
 146                                 ret += '>'
 147                                 unless void_elements[el.name]
 148                                         if el.children.length
 149                                                 ret += dom_to_html el.children
 150                                         ret += "</#{el.name}>"
 151                         when TYPE_TEXT
 152                                 ret += enc_text el.text
 153                         when TYPE_COMMENT
 154                                 ret += "<!--#{el.text}-->"
 155                         when TYPE_DOCTYPE
 156                                 ret += "<!DOCTYPE #{el.name}"
 157                                 if el.public_identifier? and el.public_identifier.length > 0
 158                                         ret += " \"#{el.public_identifier}\""
 159                                 if el.system_identifier? and el.system_identifier.length > 0
 160                                         ret += " \"#{el.system_identifier}\""
 161                                 ret += ">\n"
 162         return ret
 163
 164 domify = (h) ->
 165         for tag, attrs of h
 166                 if tag is 'text'
 167                         return document.createTextNode attrs
 168                 el = document.createElement tag
 169                 for k, v of attrs
 170                         if k is 'children'
 171                                 for child in v
 172                                         el.appendChild child
 173                         else
 174                                 el.setAttribute k, v
 175         return el
 176
 177 css = ''
 178 css += 'div#peach_html5_editor_cursor {'
 179 css +=     'position: absolute;'
 180 css +=     'height: 1em;'
 181 css +=     'width: 2px;'
 182 css +=     'margin-left: -1px;'
 183 css +=     'margin-right: -1px;'
 184 css +=     'background: #444;'
 185 css +=     '-webkit-animation: blink 1s steps(2, start) infinite;'
 186 css +=     'animation: blink 1s steps(2, start) infinite;'
 187 css += '}'
 188 css += '@-webkit-keyframes blink {'
 189 css +=     'to { visibility: hidden; }'
 190 css += '}'
 191 css += '@keyframes blink {'
 192 css +=     'to { visibility: hidden; }'
 193 css += '}'
 194
 195 # key codes:
 196 KEY_LEFT = 37
 197 KEY_UP = 38
 198 KEY_RIGHT = 39
 199 KEY_DOWN = 40
 200 KEY_BACKSPACE = 8 # <--
 201 KEY_DELETE = 46 # -->
 202 KEY_END = 35
 203 KEY_ENTER = 13
 204 KEY_ESCAPE = 27
 205 KEY_HOME = 36
 206 KEY_INSERT = 45
 207 KEY_PAGE_UP = 33
 208 KEY_PAGE_DOWN = 34
 209 KEY_TAB = 9
 210
 211 instantiate_tree = (tree, parent) ->
 212         for c in tree
 213                 switch c.type
 214                         when TYPE_TEXT
 215                                 c.el = parent.ownerDocument.createTextNode c.text
 216                                 parent.appendChild c.el
 217                         when TYPE_TAG
 218                                 # TODO create in correct namespace
 219                                 c.el = parent.ownerDocument.createElement c.name
 220                                 for k, v of c.attrs
 221                                         # FIXME if attr_whitelist[k]?
 222                                         c.el.setAttribute k, v
 223                                 parent.appendChild c.el
 224                                 if c.children.length
 225                                         instantiate_tree c.children, c.el
 226
 227 traverse_tree = (tree, state, cb) ->
 228         for c in tree
 229                 cb c, state
 230                 break if state.done?
 231                 if c.children.length
 232                         traverse_tree c.children, state, cb
 233                         break if state.done?
 234         return state
 235 # find the next element in tree (and decendants) that is after n and can contain text
 236 # TODO make it so cursor can go places that don't have text but could
 237 find_next_cursor_position = (tree, n, i) ->
 238         if n? and n.type is TYPE_TEXT and n.text.length > i
 239                 orig_xyh = cursor_to_xyh n, i
 240                 unless orig_xyh?
 241                         console.log "ERROR: couldn't find xy for current cursor location"
 242                         return
 243                 for next_i in [i+1 .. n.text.length] # inclusive is valid (after last char)
 244                         next_xyh = cursor_to_xyh n, next_i
 245                         if next_xyh?
 246                                 if next_xyh.x > orig_xyh.x or next_xyh.y > orig_xyh.y
 247                                         return [n, next_i]
 248         found = traverse_tree tree, before: n?, (node, state) ->
 249                 if node.type is TYPE_TEXT and state.before is false
 250                         state.node = node
 251                         state.done = true
 252                 if node is n
 253                         state.before = false
 254         if found.node?
 255                 return [found.node, 0]
 256         return null
 257
 258 # TODO make it so cursor can go places that don't have text but could
 259 find_prev_cursor_position = (tree, n, i) ->
 260         if n? and n.type is TYPE_TEXT and i > 0
 261                 orig_xyh = cursor_to_xyh n, i
 262                 unless orig_xyh?
 263                         console.log "ERROR: couldn't find xy for current cursor location"
 264                         return
 265                 for prev_i in [i-1 .. 0]
 266                         prev_xyh = cursor_to_xyh n, prev_i
 267                         if prev_xyh?
 268                                 if prev_xyh.x < orig_xyh.x or prev_xyh.y < orig_xyh.y
 269                                         return [n, prev_i]
 270                 return [n, i - 1]
 271         found = traverse_tree tree, before: n?, (node, state) ->
 272                 if node.type is TYPE_TEXT
 273                         unless n?
 274                                 state.node = node
 275                                 state.done = true
 276                         if node is n
 277                                 if state.prev?
 278                                         state.node = state.prev
 279                                 state.done = true
 280                         if node
 281                                 state.prev = node
 282         if found.node?
 283                 return [found.node, found.node.text.length]
 284         return null
 285
 286 find_loc_cursor_position = (tree, loc) ->
 287         for c in tree
 288                 if c.type is TYPE_TAG or c.type is TYPE_TEXT
 289                         bounds = get_el_bounds c.el
 290                         continue if loc.x < bounds.x
 291                         continue if loc.x > bounds.x + bounds.w
 292                         continue if loc.y < bounds.y
 293                         continue if loc.y > bounds.y + bounds.h
 294                         if c.children.length
 295                                 ret = find_loc_cursor_position c.children, loc
 296                                 return ret if ret?
 297                         if c.type is TYPE_TEXT
 298                                 # click is within bounding box that contains all text.
 299                                 return [c, 0] if c.text.length is 0
 300                                 before_i = 0
 301                                 before = cursor_to_xyh c, before_i
 302                                 unless before?
 303                                         console.log "error: failed to find cursor pixel location for start of", c
 304                                         return
 305                                 after_i = c.text.length
 306                                 after = cursor_to_xyh c, after_i
 307                                 unless after?
 308                                         console.log "error: failed to find cursor pixel location for end of", c
 309                                         return
 310                                 if loc.y < before.y + before.h and loc.x < before.x
 311                                         # console.log 'before first char on first line'
 312                                         continue
 313                                 if loc.y > after.y and loc.x > after.x
 314                                         # console.log 'after last char on last line'
 315                                         continue
 316                                 if loc.y < before.y
 317                                         console.log "Warning: click in bounding box but above first line"
 318                                         continue # above first line (runaround?)
 319                                 if loc.y > after.y + after.h
 320                                         console.log "Warning: click in bounding box but below last line", loc.y, after.y, after.h
 321                                         continue # below last line (shouldn't happen?)
 322                                 while after_i - before_i > 1
 323                                         cur_i = Math.round((before_i + after_i) / 2)
 324                                         cur = cursor_to_xyh c, cur_i
 325                                         unless loc?
 326                                                 console.log "error: failed to find cursor pixel location for", c, cur_i
 327                                                 return
 328                                         if loc.y < cur.y or (loc.y <= cur.y + cur.h and loc.x < cur.x)
 329                                                 after_i = cur_i
 330                                                 after = cur
 331                                         else
 332                                                 before_i = cur_i
 333                                                 before = cur
 334                                 # which one is closest?
 335                                 if Math.abs(before.x - loc.x) < Math.abs(after.x - loc.x)
 336                                         return [c, before_i]
 337                                 else
 338                                         return [c, after_i]
 339         return null
 340
 341 # browsers collapse these (html5 spec calls these "space characters")
 342 is_space_code = (char_code) ->
 343         switch char_code
 344                 when 9, 10, 12, 13, 32
 345                         return true
 346         return false
 347 is_space = (chr) ->
 348         return is_space_code chr.charCodeAt 0
 349
 350 # pass a array of nodes (from parser library, ie it should have .el and .text)
 351 tree_dedup_space = (tree) ->
 352         prev = cur = next = null
 353         prev_i = cur_i = next_i = 0
 354         prev_pos = pos = next_pos = null
 355         prev_px = cur_px = next_px = null
 356         first = true
 357         removed_char = null
 358
 359         iterate = (tree, cb) ->
 360                 for n in tree
 361                         if n.type is TYPE_TEXT
 362                                 i = 0
 363                                 while i < n.text.length # don't foreach, cb might remove chars
 364                                         advance = cb n, i
 365                                         if advance
 366                                                 i += 1
 367                         if n.type is TYPE_TAG
 368                                 block = is_display_block n.el
 369                                 if block
 370                                         cb null
 371                                 if n.children.length > 0
 372                                         iterate n.children, cb
 373                                 if block
 374                                         cb null
 375         # remove cur char
 376         remove = ->
 377                 removed_char = cur.text.charAt(cur_i)
 378                 cur.el.textContent = cur.text = (cur.text.substr 0, cur_i) + (cur.text.substr cur_i + 1)
 379                 if next is cur # in same text node
 380                         if next_i is 0
 381                                 throw "how is this possible?"
 382                         next_i -= 1
 383                 return true
 384         # undo remove()
 385         put_it_back = ->
 386                 cur.el.textContent = cur.text = (cur.text.substr 0, cur_i) + removed_char + (cur.text.substr cur_i)
 387                 if next is cur # in same text node
 388                         next_i += 1
 389                 return false
 390         # return true if cur was removed from the dom (ie re-use same prev)
 391         operate = ->
 392                 # cur definitately set
 393                 # prev and/or next might be null, indicating the start/end of a display:block
 394                 return false unless is_space_code cur.text.charCodeAt cur_i
 395                 bounds = text_range_bounds cur.el, cur_i, cur_i + 1
 396                 # consistent cases:
 397                 # 1. zero rects returned by getClientRects() means collapsed space
 398                 if bounds is null
 399                         return remove()
 400                 # 2. width greater than zero means visible space
 401                 if bounds.w > 0
 402                         return false
 403                 # now the weird edge cases...
 404                 #
 405                 # firefox and chromium both report zero width for characters at the end
 406                 # of a line where the text wraps (automatically, due to word-wrap) to
 407                 # the next line. These do not appear to be distinguishable from
 408                 # collapsed spaces via the range/bounds api, so...
 409                 #
 410                 # remove it from the dom, and if prev or next moves, put it back.
 411                 if prev? and not prev_px?
 412                         prev_px = cursor_to_xyh prev, prev_i
 413                 if next? and not next_px?
 414                         next_px = cursor_to_xyh next, next_i
 415                 #if prev is null and next is null
 416                 #       parent_px = cur.parent.el.getBoundingClientRect()
 417                 remove()
 418                 if prev?
 419                         if prev_px?
 420                                 new_prev_px = cursor_to_xyh prev, prev_i
 421                                 if new_prev_px.x isnt prev_px.x or new_prev_px.y isnt prev_px.y
 422                                         return put_it_back()
 423                         else
 424                                 console.log "this shouldn't happen, we remove spaces that don't locate"
 425                 if next?
 426                         if next_px?
 427                                 new_next_px = cursor_to_xyh next, next_i
 428                                 if new_next_px.x isnt next_px.x or new_next_px.y isnt next_px.y
 429                                         return put_it_back()
 430                         #else
 431                         #       console.log "removing space becase space after it is collapsed"
 432                 # if there's no prev or next (single space inside a block-level element?) check
 433                 # TODO scrapt this, or fix it so it works when there's no parent
 434                 # if prev is null and next is null
 435                 #       new_parent_px = cur.parent.el.getBoundingClientRect()
 436                 #       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
 437                 #               console.log "WEIRD: parent moved"
 438                 #               return put_it_back()
 439                 # we didn't put it back
 440                 return true
 441         # pass null at start/end of display:block
 442         queue = (n, i) ->
 443                 next = n
 444                 next_i = i
 445                 next_px = null
 446                 advance = true
 447                 if cur?
 448                         removed = operate()
 449                         # don't advance (to the next character next time) if we removed a
 450                         # character from the same text node as ``next``, because doing so
 451                         # renumbers the indexes in that string
 452                         if removed and cur is next
 453                                 advance = false
 454                 else
 455                         removed = false
 456                 unless removed
 457                         prev = cur
 458                         prev_i = cur_i
 459                         prev_px = cur_px
 460                 cur = next
 461                 cur_i = next_i
 462                 cur_px = next_px
 463                 return advance
 464         queue null
 465         iterate tree, queue
 466         queue null
 467
 468 class PeachHTML5Editor
 469         constructor: (in_el, options = {}) ->
 470                 @in_el = in_el
 471                 @tree = []
 472                 @outer_el = domify div: class: 'peach_html5_editor', children: [
 473                         @iframe = domify iframe: class: 'peach_html5_editor_iframe'
 474                         @overlay = domify div: class: 'peach_html5_editor_overlay'
 475                 ]
 476                 @cursor = null
 477                 @cursor_el = null
 478                 @cursor_visible = false
 479                 opt_fragment = options.fragment ? true
 480                 @parser_opts = {}
 481                 if opt_fragment
 482                         @parser_opts.fragment = 'body'
 483
 484                 @iframe.onload = =>
 485                         @idoc = @iframe.contentDocument
 486
 487                         ignore_key_codes =
 488                                 '18': true # alt
 489                                 '20': true # capslock
 490                                 '17': true # ctrl
 491                                 '144': true # numlock
 492                                 '16': true # shift
 493                                 '91': true # windows "start" key
 494                         control_key_codes = # we react to these, but they aren't typing
 495                                 '37': KEY_LEFT
 496                                 '38': KEY_UP
 497                                 '39': KEY_RIGHT
 498                                 '40': KEY_DOWN
 499                                 '35': KEY_END
 500                                 '8':  KEY_BACKSPACE
 501                                 '46': KEY_DELETE
 502                                 '13': KEY_ENTER
 503                                 '27': KEY_ESCAPE
 504                                 '36': KEY_HOME
 505                                 '45': KEY_INSERT
 506                                 '33': KEY_PAGE_UP
 507                                 '34': KEY_PAGE_DOWN
 508                                 '9':  KEY_TAB
 509
 510                         @overlay.onclick = (e) =>
 511                                 x = (e.offsetX ? e.layerX) - overlay_padding
 512                                 y = (e.offsetY ? e.layerY) - overlay_padding
 513                                 new_cursor = find_loc_cursor_position @tree, x: x, y: y
 514                                 if new_cursor?
 515                                         @move_cursor new_cursor
 516                         @idoc.body.onkeyup = (e) =>
 517                                 return if e.ctrlKey
 518                                 return false if ignore_key_codes[e.keyCode]?
 519                                 #return false if control_key_codes[e.keyCode]?
 520                         @idoc.body.onkeydown = (e) =>
 521                                 return if e.ctrlKey
 522                                 return false if ignore_key_codes[e.keyCode]?
 523                                 #return false if control_key_codes[e.keyCode]?
 524                                 switch e.keyCode
 525                                         when KEY_LEFT
 526                                                 if @cursor?
 527                                                         new_cursor = find_prev_cursor_position @tree, @cursor...
 528                                                         if new_cursor?
 529                                                                 @move_cursor new_cursor
 530                                                 else
 531                                                         for c in @tree
 532                                                                 new_cursor = find_next_cursor_position @tree, c, -1
 533                                                                 if new_cursor?
 534                                                                         @move_cursor new_cursor
 535                                                                         break
 536                                                 return false
 537                                         when KEY_UP
 538                                                 return false
 539                                         when KEY_RIGHT
 540                                                 if @cursor?
 541                                                         new_cursor = find_next_cursor_position @tree, @cursor...
 542                                                         if new_cursor?
 543                                                                 @move_cursor new_cursor
 544                                                 else
 545                                                         for c in @tree
 546                                                                 new_cursor = find_prev_cursor_position @tree, c, -1
 547                                                                 if new_cursor?
 548                                                                         @move_cursor new_cursor
 549                                                                         break
 550                                                 return false
 551                                         when KEY_DOWN
 552                                                 return false
 553                                         when KEY_END
 554                                                 return false
 555                                         when KEY_BACKSPACE
 556                                                 return false unless @cursor?
 557                                                 return false unless @cursor[1] > 0
 558                                                 @cursor[0].text = @cursor[0].text.substr(0, @cursor[1] - 1) + @cursor[0].text.substr(@cursor[1])
 559                                                 @cursor[0].el.nodeValue = @cursor[0].text
 560                                                 @move_cursor [@cursor[0], @cursor[1] - 1]
 561                                                 return false
 562                                         when KEY_DELETE
 563                                                 return false unless @cursor?
 564                                                 return false unless @cursor[1] < @cursor[0].text.length
 565                                                 @cursor[0].text = @cursor[0].text.substr(0, @cursor[1]) + @cursor[0].text.substr(@cursor[1] + 1)
 566                                                 @cursor[0].el.nodeValue = @cursor[0].text
 567                                                 @move_cursor [@cursor[0], @cursor[1]]
 568                                                 return false
 569                                         when KEY_ENTER
 570                                                 return false
 571                                         when KEY_ESCAPE
 572                                                 return false
 573                                         when KEY_HOME
 574                                                 return false
 575                                         when KEY_INSERT
 576                                                 return false
 577                                         when KEY_PAGE_UP
 578                                                 return false
 579                                         when KEY_PAGE_DOWN
 580                                                 return false
 581                                         when KEY_TAB
 582                                                 return false
 583                         @idoc.body.onkeypress = (e) =>
 584                                 return if e.ctrlKey
 585                                 return false if ignore_key_codes[e.keyCode]?
 586                                 return false if control_key_codes[e.keyCode]? # handled in keydown
 587                                 char = e.charCode ? e.keyCode
 588                                 if char and @cursor?
 589                                         char = String.fromCharCode char
 590                                         if @cursor[1] is 0
 591                                                 @cursor[0].text = char + @cursor[0].text
 592                                         else if @cursor[1] is @cursor[0].text.length - 1
 593                                                 @cursor[0].text += char
 594                                         else
 595                                                 @cursor[0].text =
 596                                                         @cursor[0].text.substr(0, @cursor[1]) +
 597                                                         char +
 598                                                         @cursor[0].text.substr(@cursor[1])
 599                                         @cursor[0].el.nodeValue = @cursor[0].text
 600                                         @move_cursor [@cursor[0], @cursor[1] + 1]
 601                                         @changed()
 602                                 return false
 603                         if options.stylesheet # TODO test this
 604                                 istyle = @idoc.createElement 'style'
 605                                 istyle.setAttribute 'src', options.stylesheet
 606                                 @idoc.head.appendChild istyle
 607                         icss = @idoc.createElement 'style'
 608                         icss.appendChild @idoc.createTextNode css
 609                         document.head.appendChild icss
 610                         @load_html @in_el.value
 611
 612                 @in_el.parentNode.appendChild @outer_el
 613         clear_dom: ->
 614                 # FIXME add parent node, so we don't empty body and delete cursor_el
 615                 while @idoc.body.childNodes.length
 616                         @idoc.body.removeChild @idoc.body.childNodes[0]
 617                 @kill_cursor()
 618                 @cursor_visible = false
 619                 return
 620         load_html: (html) ->
 621                 @tree = peach_parser.parse html, @parser_opts
 622                 @clear_dom()
 623                 instantiate_tree @tree, @idoc.body
 624                 tree_dedup_space @tree
 625                 @changed()
 626         changed: ->
 627                 # FIXME don't export cursor placeholder (when cursor is between space characters)
 628                 @in_el.onchange = null
 629                 @in_el.value = dom_to_html @tree
 630                 @in_el.onchange = =>
 631                         @load_html @in_el.value
 632         kill_cursor: -> # remove it, forget where it was
 633                 if @cursor_visible
 634                         @cursor_el.parentNode.removeChild @cursor_el
 635                         @cursor_visible = false
 636                 @cursor = null
 637         move_cursor: (cursor) ->
 638                 loc = cursor_to_xyh cursor[0], cursor[1]
 639                 unless loc?
 640                         console.log "error: tried to move cursor to position that has no pixel location", cursor[0], cursor[1]
 641                         return
 642                 @cursor = cursor
 643                 # replace cursor, to reset blink animation
 644                 if @cursor_visible
 645                         @cursor_el.parentNode.removeChild @cursor_el
 646                 @cursor_el = domify div: id: 'peach_html5_editor_cursor'
 647                 @overlay.appendChild @cursor_el
 648                 @cursor_visible = true
 649                 # TODO figure out x,y coords for cursor
 650                 @cursor_el.style.left = "#{loc.x + overlay_padding}px"
 651                 @cursor_el.style.top = "#{loc.y + overlay_padding}px"
 652
 653 window.peach_html5_editor = (args...) ->
 654         return new PeachHTML5Editor args...
 655
 656 # test in browser: peach_html5_editor(document.getElementsByTagName('textarea')[0])