diff options
Diffstat (limited to 'trunk/etherpad/src/etherpad/pad/importhtml.js')
| -rw-r--r-- | trunk/etherpad/src/etherpad/pad/importhtml.js | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/trunk/etherpad/src/etherpad/pad/importhtml.js b/trunk/etherpad/src/etherpad/pad/importhtml.js new file mode 100644 index 0000000..4a48c6f --- /dev/null +++ b/trunk/etherpad/src/etherpad/pad/importhtml.js @@ -0,0 +1,230 @@ +/** + * Copyright 2009 Google Inc. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS-IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + + +jimport("org.ccil.cowan.tagsoup.Parser"); +jimport("org.ccil.cowan.tagsoup.PYXWriter"); +jimport("java.io.StringReader"); +jimport("java.io.StringWriter"); +jimport("org.xml.sax.InputSource"); + +import("etherpad.collab.ace.easysync2.{Changeset,AttribPool}"); +import("etherpad.collab.ace.contentcollector.makeContentCollector"); +import("etherpad.collab.collab_server"); + +function setPadHTML(pad, html) { + var atext = htmlToAText(html, pad.pool()); + collab_server.setPadAText(pad, atext); +} + +function _html2pyx(html) { + var p = new Parser(); + var w = new StringWriter(); + var h = new PYXWriter(w); + p.setContentHandler(h); + var s = new InputSource(); + s.setCharacterStream(new StringReader(html)); + p.parse(s); + return w.toString().replace(/\r\n|\r|\n/g, '\n'); +} + +function _htmlBody2js(html) { + var pyx = _html2pyx(html); + var plines = pyx.split("\n"); + + function pyxUnescape(s) { + return s.replace(/\\t/g, '\t').replace(/\\/g, '\\'); + } + var inAttrs = false; + + var nodeStack = []; + var topNode = {}; + + var bodyNode = {name:"body"}; + + plines.forEach(function(pline) { + var t = pline.charAt(0); + var v = pline.substring(1); + if (inAttrs && t != 'A') { + inAttrs = false; + } + if (t == '?') { /* ignore */ } + else if (t == '(') { + var newNode = {name: v}; + if (v.toLowerCase() == "body") { + bodyNode = newNode; + } + topNode.children = (topNode.children || []); + topNode.children.push(newNode); + nodeStack.push(topNode); + topNode = newNode; + inAttrs = true; + } + else if (t == 'A') { + var spaceIndex = v.indexOf(' '); + var key = v.substring(0, spaceIndex); + var value = pyxUnescape(v.substring(spaceIndex+1)); + topNode.attrs = (topNode.attrs || {}); + topNode.attrs['$'+key] = value; + } + else if (t == '-') { + if (v == "\\n") { + v = '\n'; + } + else { + v = pyxUnescape(v); + } + if (v) { + topNode.children = (topNode.children || []); + if (topNode.children.length > 0 && + ((typeof topNode.children[topNode.children.length-1]) == "string")) { + // coallesce + topNode.children.push(topNode.children.pop() + v); + } + else { + topNode.children.push(v); + } + } + } + else if (t == ')') { + topNode = nodeStack.pop(); + } + }); + + return bodyNode; +} + +function _trimDomNode(n) { + function isWhitespace(str) { + return /^\s*$/.test(str); + } + function trimBeginningOrEnd(n, endNotBeginning) { + var cc = n.children; + var backwards = endNotBeginning; + if (cc) { + var i = (backwards ? cc.length-1 : 0); + var done = false; + var hitActualText = false; + while (! done) { + if (! (backwards ? (i >= 0) : (i < cc.length-1))) { + done = true; + } + else { + var c = cc[i]; + if ((typeof c) == "string") { + if (! isWhitespace(c)) { + // actual text + hitActualText = true; + break; + } + else { + // whitespace + cc[i] = ''; + } + } + else { + // recurse + if (trimBeginningOrEnd(cc[i], endNotBeginning)) { + hitActualText = true; + break; + } + } + i += (backwards ? -1 : 1); + } + } + n.children = n.children.filter(function(x) { return !!x; }); + return hitActualText; + } + return false; + } + trimBeginningOrEnd(n, false); + trimBeginningOrEnd(n, true); +} + +function htmlToAText(html, apool) { + var body = _htmlBody2js(html); + _trimDomNode(body); + + var dom = { + isNodeText: function(n) { + return (typeof n) == "string"; + }, + nodeTagName: function(n) { + return ((typeof n) == "object") && n.name; + }, + nodeValue: function(n) { + return String(n); + }, + nodeNumChildren: function(n) { + return (((typeof n) == "object") && n.children && n.children.length) || 0; + }, + nodeChild: function(n, i) { + return (((typeof n) == "object") && n.children && n.children[i]) || null; + }, + nodeProp: function(n, p) { + return (((typeof n) == "object") && n.attrs && n.attrs[p]) || null; + }, + nodeAttr: function(n, a) { + return (((typeof n) == "object") && n.attrs && n.attrs[a]) || null; + }, + optNodeInnerHTML: function(n) { + return null; + } + } + + var cc = makeContentCollector(true, null, apool, dom); + for(var i=0; i<dom.nodeNumChildren(body); i++) { + var n = dom.nodeChild(body, i); + cc.collectContent(n); + } + cc.notifyNextNode(null); + var ccData = cc.finish(); + + var textLines = ccData.lines; + var attLines = ccData.lineAttribs; + for(var i=0;i<textLines.length;i++) { + var txt = textLines[i]; + if (txt == " " || txt == "\xa0") { + // space or nbsp all alone on a line, remove + textLines[i] = ""; + attLines[i] = ""; + } + } + + var text = textLines.join('\n')+'\n'; + var attribs = _joinLineAttribs(attLines); + var atext = Changeset.makeAText(text, attribs); + + return atext; +} + +function _joinLineAttribs(lineAttribs) { + var assem = Changeset.smartOpAssembler(); + + var newline = Changeset.newOp('+'); + newline.chars = 1; + newline.lines = 1; + + lineAttribs.forEach(function(aline) { + var iter = Changeset.opIterator(aline); + while (iter.hasNext()) { + assem.append(iter.next()); + } + assem.append(newline); + }); + + return assem.toString(); +}
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