# text nodes don't have getBoundingClientRect(), so use selection api to find
# it.
-get_text_bounding_rect = (el) ->
get_el_bounds = (el) ->
if el.getBoundingClientRect?
rect = el.getBoundingClientRect()
h: rect.height ? (rect.top - rect.bottom)
}
+is_display_block = (el) ->
+ if el.currentStyle?
+ return el.currentStyle.display is 'block'
+ else
+ return window.getComputedStyle(el, null).getPropertyValue('display') is 'block'
+
+# Warning: currently assumes you're asking about a single character
+# Note: chromium returns multiple bounding rects for a space at a line-break
+# Note: chromium's getBoundingClientRect() is broken (when zero-area client rects)
+# Note: sometimes returns null (eg for whitespace that is not visible)
+text_range_bounds = (el, start, end) ->
+ range = document.createRange()
+ range.setStart el, start
+ range.setEnd el, end
+ rects = range.getClientRects()
+ if rects.length > 0
+ rect = rects[0]
+ else
+ return null
+ doc = el.ownerDocument.documentElement
+ win = el.ownerDocument.defaultView
+ y_fix = win.pageYOffset - doc.clientTop
+ x_fix = win.pageXOffset - doc.clientLeft
+ return {
+ x: rect.left + x_fix
+ y: rect.top + y_fix
+ w: rect.width ? (rect.right - rect.left)
+ h: rect.height ? (rect.top - rect.bottom)
+ rects: rects
+ bounding: range.getBoundingClientRect()
+ }
+
# figure out the x/y coordinates of where the cursor should be if it's at
# position ``i`` within text node ``n``
+# sometimes returns null (eg for whitespace that is not visible)
window.cursor_to_xyh = cursor_to_xyh = (n, i) ->
range = document.createRange()
- plus_width = false
if n.text.length is 0
- range.setStart n.el, i
- range.setEnd n.el, i
+ ret = text_range_bounds n.el, 0, 0
if i is n.text.length
- range.setStart n.el, i - 1
- range.setEnd n.el, i
- plus_width = true
- else
- range.setStart n.el, i
- range.setEnd n.el, i + 1
- # chromium returns bogus results with getBoundingClientRect() when zero width and/or height
- rect = range.getClientRects()
- if rect.length > 0
- if plus_width
- # chromium returns multiple rects for the space that is broken
- # across lines by word-wrap (firefox doesn't)
- rect = rect[rect.length - 1]
- else
- rect = rect[0]
+ ret = text_range_bounds n.el, i - 1, i
+ if ret?
+ ret.x += ret.w
else
- return x: 0, y: 0, w: 0, h: 0 # TODO return null, fix callers
- ret = {
- x: rect.left
- y: rect.top
- w: rect.width ? (rect.right - rect.left)
- h: rect.height ? (rect.top - rect.bottom)
- }
- if plus_width
- ret.x += ret.w
- debug_dot_at n.el.ownerDocument, ret.x, ret.y
+ ret = text_range_bounds n.el, i, i + 1
+ if ret?
+ debug_dot_at n.el.ownerDocument, ret.x, ret.y
return ret
# encode text so it can be safely placed inside an html attribute
find_next_cursor_position = (tree, n, i) ->
if n? and n.type is TYPE_TEXT and n.text.length > i
orig_xyh = cursor_to_xyh n, i
+ unless orig_xyh?
+ console.log "ERROR: couldn't find xy for current cursor location"
+ return
for next_i in [i+1 .. n.text.length] # inclusive is valid (after last char)
next_xyh = cursor_to_xyh n, next_i
- if next_xyh.x > orig_xyh.x or next_xyh.y > orig_xyh.y
- return [n, next_i]
+ if next_xyh?
+ if next_xyh.x > orig_xyh.x or next_xyh.y > orig_xyh.y
+ return [n, next_i]
found = traverse_tree tree, before: n?, (node, state) ->
if node.type is TYPE_TEXT and state.before is false
state.node = node
find_prev_cursor_position = (tree, n, i) ->
if n? and n.type is TYPE_TEXT and i > 0
orig_xyh = cursor_to_xyh n, i
+ unless orig_xyh?
+ console.log "ERROR: couldn't find xy for current cursor location"
+ return
for prev_i in [i-1 .. 0]
prev_xyh = cursor_to_xyh n, prev_i
- if prev_xyh.x < orig_xyh.x or prev_xyh.y < orig_xyh.y
- return [n, prev_i]
+ if prev_xyh?
+ if prev_xyh.x < orig_xyh.x or prev_xyh.y < orig_xyh.y
+ return [n, prev_i]
return [n, i - 1]
found = traverse_tree tree, before: n?, (node, state) ->
if node.type is TYPE_TEXT
return [c, 0] if c.text.length is 0
before_i = 0
before = cursor_to_xyh c, before_i
+ unless before?
+ console.log "error: failed to find cursor pixel location for start of", c
+ return
after_i = c.text.length
after = cursor_to_xyh c, after_i
+ unless after?
+ console.log "error: failed to find cursor pixel location for end of", c
+ return
if loc.y < before.y + before.h and loc.x < before.x
# console.log 'before first char on first line'
continue
while after_i - before_i > 1
cur_i = Math.round((before_i + after_i) / 2)
cur = cursor_to_xyh c, cur_i
+ unless loc?
+ console.log "error: failed to find cursor pixel location for", c, cur_i
+ return
if loc.y < cur.y or (loc.y <= cur.y + cur.h and loc.x < cur.x)
after_i = cur_i
after = cur
return [c, after_i]
return null
+# browsers collapse these (html5 spec calls these "space characters")
+is_space_code = (char_code) ->
+ switch char_code
+ when 9, 10, 12, 13, 32
+ return true
+ return false
+is_space = (chr) ->
+ return is_space_code chr.charCodeAt 0
+
+# pass a array of nodes (from parser library, ie it should have .el and .text)
+tree_dedup_space = (tree) ->
+ prev = cur = next = null
+ prev_i = cur_i = next_i = 0
+ prev_pos = pos = next_pos = null
+ prev_px = cur_px = next_px = null
+ first = true
+ removed_char = null
+
+ iterate = (tree, cb) ->
+ for n in tree
+ if n.type is TYPE_TEXT
+ i = 0
+ while i < n.text.length # don't foreach, cb might remove chars
+ advance = cb n, i
+ if advance
+ i += 1
+ if n.type is TYPE_TAG
+ block = is_display_block n.el
+ if block
+ cb null
+ if n.children.length > 0
+ iterate n.children, cb
+ if block
+ cb null
+ # remove cur char
+ remove = ->
+ removed_char = cur.text.charAt(cur_i)
+ cur.el.textContent = cur.text = (cur.text.substr 0, cur_i) + (cur.text.substr cur_i + 1)
+ if next is cur # in same text node
+ if next_i is 0
+ throw "how is this possible?"
+ next_i -= 1
+ return true
+ # undo remove()
+ put_it_back = ->
+ cur.el.textContent = cur.text = (cur.text.substr 0, cur_i) + removed_char + (cur.text.substr cur_i)
+ if next is cur # in same text node
+ next_i += 1
+ return false
+ # return true if cur was removed from the dom (ie re-use same prev)
+ operate = ->
+ # cur definitately set
+ # prev and/or next might be null, indicating the start/end of a display:block
+ return false unless is_space_code cur.text.charCodeAt cur_i
+ bounds = text_range_bounds cur.el, cur_i, cur_i + 1
+ # consistent cases:
+ # 1. zero rects returned by getClientRects() means collapsed space
+ if bounds is null
+ return remove()
+ # 2. width greater than zero means visible space
+ if bounds.w > 0
+ return false
+ # now the weird edge cases...
+ #
+ # firefox and chromium both report zero width for characters at the end
+ # of a line where the text wraps (automatically, due to word-wrap) to
+ # the next line. These do not appear to be distinguishable from
+ # collapsed spaces via the range/bounds api, so...
+ #
+ # remove it from the dom, and if prev or next moves, put it back.
+ if prev? and not prev_px?
+ prev_px = cursor_to_xyh prev, prev_i
+ if next? and not next_px?
+ next_px = cursor_to_xyh next, next_i
+ #if prev is null and next is null
+ # parent_px = cur.parent.el.getBoundingClientRect()
+ remove()
+ if prev?
+ if prev_px?
+ new_prev_px = cursor_to_xyh prev, prev_i
+ if new_prev_px.x isnt prev_px.x or new_prev_px.y isnt prev_px.y
+ return put_it_back()
+ else
+ console.log "this shouldn't happen, we remove spaces that don't locate"
+ if next?
+ if next_px?
+ new_next_px = cursor_to_xyh next, next_i
+ if new_next_px.x isnt next_px.x or new_next_px.y isnt next_px.y
+ return put_it_back()
+ #else
+ # console.log "removing space becase space after it is collapsed"
+ # if there's no prev or next (single space inside a block-level element?) check
+ # TODO scrapt this, or fix it so it works when there's no parent
+ # if prev is null and next is null
+ # new_parent_px = cur.parent.el.getBoundingClientRect()
+ # 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
+ # console.log "WEIRD: parent moved"
+ # return put_it_back()
+ # we didn't put it back
+ return true
+ # pass null at start/end of display:block
+ queue = (n, i) ->
+ next = n
+ next_i = i
+ next_px = null
+ advance = true
+ if cur?
+ removed = operate()
+ # don't advance (to the next character next time) if we removed a
+ # character from the same text node as ``next``, because doing so
+ # renumbers the indexes in that string
+ if removed and cur is next
+ advance = false
+ else
+ removed = false
+ unless removed
+ prev = cur
+ prev_i = cur_i
+ prev_px = cur_px
+ cur = next
+ cur_i = next_i
+ cur_px = next_px
+ return advance
+ queue null
+ iterate tree, queue
+ queue null
+
class PeachHTML5Editor
constructor: (in_el, options = {}) ->
@in_el = in_el
@cursor[0].text.substr(@cursor[1])
@cursor[0].el.nodeValue = @cursor[0].text
@move_cursor [@cursor[0], @cursor[1] + 1]
+ @changed()
return false
if options.stylesheet # TODO test this
istyle = @idoc.createElement 'style'
return
load_html: (html) ->
@tree = peach_parser.parse html, @parser_opts
- #as_html = dom_to_html @tree
- #@iframe.contentDocument.body.innerHTML = as_html
@clear_dom()
instantiate_tree @tree, @idoc.body
+ tree_dedup_space @tree
+ @changed()
+ changed: ->
+ # FIXME don't export cursor placeholder (when cursor is between space characters)
+ @in_el.onchange = null
+ @in_el.value = dom_to_html @tree
+ @in_el.onchange = =>
+ @load_html @in_el.value
move_cursor: (cursor) ->
loc = cursor_to_xyh cursor[0], cursor[1]
- return if loc is null
+ unless loc?
+ console.log "error: tried to move cursor to position that has no pixel location", cursor[0], cursor[1]
+ return
@cursor = cursor
# replace cursor, to reset blink animation
if @cursor_visible
Got questions, comments, patches, etc.? Contact Jason Woofenden