508 lines
12 KiB
JavaScript
508 lines
12 KiB
JavaScript
/**
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* Copyright 2009 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS-IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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var async = require("async");
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var Changeset = require("./Changeset");
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var padManager = require("../db/PadManager");
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function getPadPlainText(pad, revNum)
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{
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var atext = ((revNum !== undefined) ? pad.getInternalRevisionAText(revNum) : pad.atext());
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var textLines = atext.text.slice(0, -1).split('\n');
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var attribLines = Changeset.splitAttributionLines(atext.attribs, atext.text);
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var apool = pad.pool();
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var pieces = [];
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for (var i = 0; i < textLines.length; i++)
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{
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var line = _analyzeLine(textLines[i], attribLines[i], apool);
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if (line.listLevel)
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{
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var numSpaces = line.listLevel * 2 - 1;
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var bullet = '*';
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pieces.push(new Array(numSpaces + 1).join(' '), bullet, ' ', line.text, '\n');
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}
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else
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{
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pieces.push(line.text, '\n');
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}
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}
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return pieces.join('');
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}
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function getPadHTML(pad, revNum, callback)
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{
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var atext = pad.atext;
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var html;
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async.waterfall([
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// fetch revision atext
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function (callback)
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{
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if (revNum != undefined)
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{
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pad.getInternalRevisionAText(revNum, function (err, revisionAtext)
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{
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atext = revisionAtext;
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callback(err);
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});
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}
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else
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{
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callback(null);
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}
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},
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// convert atext to html
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function (callback)
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{
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html = getHTMLFromAtext(pad, atext);
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callback(null);
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}],
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// run final callback
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function (err)
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{
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callback(err, html);
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});
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}
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function getHTMLFromAtext(pad, atext)
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{
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var apool = pad.apool();
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var textLines = atext.text.slice(0, -1).split('\n');
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var attribLines = Changeset.splitAttributionLines(atext.attribs, atext.text);
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var tags = ['h1', 'h2', 'strong', 'em', 'u', 's'];
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var props = ['heading1', 'heading2', 'bold', 'italic', 'underline', 'strikethrough'];
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var anumMap = {};
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props.forEach(function (propName, i)
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{
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var propTrueNum = apool.putAttrib([propName, true], true);
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if (propTrueNum >= 0)
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{
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anumMap[propTrueNum] = i;
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}
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});
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function getLineHTML(text, attribs)
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{
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var propVals = [false, false, false];
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var ENTER = 1;
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var STAY = 2;
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var LEAVE = 0;
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// Use order of tags (b/i/u) as order of nesting, for simplicity
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// and decent nesting. For example,
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// <b>Just bold<b> <b><i>Bold and italics</i></b> <i>Just italics</i>
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// becomes
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// <b>Just bold <i>Bold and italics</i></b> <i>Just italics</i>
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var taker = Changeset.stringIterator(text);
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var assem = Changeset.stringAssembler();
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function emitOpenTag(i)
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{
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assem.append('<');
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assem.append(tags[i]);
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assem.append('>');
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}
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function emitCloseTag(i)
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{
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assem.append('</');
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assem.append(tags[i]);
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assem.append('>');
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}
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var urls = _findURLs(text);
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var idx = 0;
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function processNextChars(numChars)
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{
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if (numChars <= 0)
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{
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return;
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}
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var iter = Changeset.opIterator(Changeset.subattribution(attribs, idx, idx + numChars));
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idx += numChars;
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while (iter.hasNext())
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{
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var o = iter.next();
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var propChanged = false;
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Changeset.eachAttribNumber(o.attribs, function (a)
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{
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if (a in anumMap)
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{
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var i = anumMap[a]; // i = 0 => bold, etc.
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if (!propVals[i])
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{
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propVals[i] = ENTER;
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propChanged = true;
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}
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else
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{
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propVals[i] = STAY;
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}
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}
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});
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for (var i = 0; i < propVals.length; i++)
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{
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if (propVals[i] === true)
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{
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propVals[i] = LEAVE;
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propChanged = true;
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}
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else if (propVals[i] === STAY)
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{
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propVals[i] = true; // set it back
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}
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}
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// now each member of propVal is in {false,LEAVE,ENTER,true}
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// according to what happens at start of span
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if (propChanged)
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{
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// leaving bold (e.g.) also leaves italics, etc.
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var left = false;
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for (var i = 0; i < propVals.length; i++)
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{
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var v = propVals[i];
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if (!left)
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{
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if (v === LEAVE)
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{
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left = true;
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}
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}
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else
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{
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if (v === true)
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{
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propVals[i] = STAY; // tag will be closed and re-opened
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}
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}
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}
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for (var i = propVals.length - 1; i >= 0; i--)
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{
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if (propVals[i] === LEAVE)
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{
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emitCloseTag(i);
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propVals[i] = false;
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}
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else if (propVals[i] === STAY)
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{
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emitCloseTag(i);
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}
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}
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for (var i = 0; i < propVals.length; i++)
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{
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if (propVals[i] === ENTER || propVals[i] === STAY)
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{
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emitOpenTag(i);
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propVals[i] = true;
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}
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}
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// propVals is now all {true,false} again
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} // end if (propChanged)
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var chars = o.chars;
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if (o.lines)
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{
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chars--; // exclude newline at end of line, if present
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}
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var s = taker.take(chars);
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assem.append(_escapeHTML(s));
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} // end iteration over spans in line
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for (var i = propVals.length - 1; i >= 0; i--)
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{
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if (propVals[i])
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{
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emitCloseTag(i);
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propVals[i] = false;
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}
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}
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} // end processNextChars
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if (urls)
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{
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urls.forEach(function (urlData)
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{
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var startIndex = urlData[0];
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var url = urlData[1];
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var urlLength = url.length;
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processNextChars(startIndex - idx);
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assem.append('<a href="' + url.replace(/\"/g, '"') + '">');
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processNextChars(urlLength);
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assem.append('</a>');
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});
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}
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processNextChars(text.length - idx);
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return _processSpaces(assem.toString());
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} // end getLineHTML
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var pieces = [];
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// Need to deal with constraints imposed on HTML lists; can
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// only gain one level of nesting at once, can't change type
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// mid-list, etc.
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// People might use weird indenting, e.g. skip a level,
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// so we want to do something reasonable there. We also
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// want to deal gracefully with blank lines.
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var lists = []; // e.g. [[1,'bullet'], [3,'bullet'], ...]
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for (var i = 0; i < textLines.length; i++)
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{
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var line = _analyzeLine(textLines[i], attribLines[i], apool);
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var lineContent = getLineHTML(line.text, line.aline);
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if (line.listLevel || lists.length > 0)
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{
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// do list stuff
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var whichList = -1; // index into lists or -1
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if (line.listLevel)
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{
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whichList = lists.length;
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for (var j = lists.length - 1; j >= 0; j--)
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{
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if (line.listLevel <= lists[j][0])
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{
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whichList = j;
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}
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}
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}
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if (whichList >= lists.length)
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{
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lists.push([line.listLevel, line.listTypeName]);
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pieces.push('<ul><li>', lineContent || '<br>');
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}
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else if (whichList == -1)
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{
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if (line.text)
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{
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// non-blank line, end all lists
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pieces.push(new Array(lists.length + 1).join('</li></ul\n>'));
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lists.length = 0;
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pieces.push(lineContent, '<br>');
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}
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else
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{
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pieces.push('<br><br>');
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}
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}
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else
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{
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while (whichList < lists.length - 1)
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{
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pieces.push('</li></ul>');
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lists.length--;
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}
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pieces.push('</li><li>', lineContent || '<br>');
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}
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}
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else
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{
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pieces.push(lineContent, '<br>');
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}
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}
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pieces.push(new Array(lists.length + 1).join('</li></ul>'));
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return pieces.join('');
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}
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function _analyzeLine(text, aline, apool)
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{
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var line = {};
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// identify list
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var lineMarker = 0;
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line.listLevel = 0;
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if (aline)
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{
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var opIter = Changeset.opIterator(aline);
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if (opIter.hasNext())
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{
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var listType = Changeset.opAttributeValue(opIter.next(), 'list', apool);
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if (listType)
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{
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lineMarker = 1;
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listType = /([a-z]+)([12345678])/.exec(listType);
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if (listType)
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{
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line.listTypeName = listType[1];
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line.listLevel = Number(listType[2]);
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}
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}
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}
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}
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if (lineMarker)
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{
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line.text = text.substring(1);
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line.aline = Changeset.subattribution(aline, 1);
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}
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else
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{
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line.text = text;
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line.aline = aline;
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}
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return line;
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}
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exports.getPadHTMLDocument = function (padId, revNum, noDocType, callback)
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{
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padManager.getPad(padId, function (err, pad)
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{
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if (err)
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{
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callback(err);
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return;
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}
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var head = (noDocType ? '' : '<!doctype html>\n') + '<html lang="en">\n' + (noDocType ? '' : '<head>\n' + '<meta charset="utf-8">\n' + '<style> * { font-family: arial, sans-serif;\n' + 'font-size: 13px;\n' + 'line-height: 17px; }</style>\n' + '</head>\n') + '<body>';
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var foot = '</body>\n</html>\n';
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getPadHTML(pad, revNum, function (err, html)
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{
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callback(err, head + html + foot);
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});
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});
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}
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function _escapeHTML(s)
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{
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var re = /[&<>]/g;
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if (!re.MAP)
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{
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// persisted across function calls!
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re.MAP = {
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'&': '&',
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'<': '<',
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'>': '>',
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};
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}
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s = s.replace(re, function (c)
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{
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return re.MAP[c];
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});
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return s.replace(/[^\x21-\x7E\s\t\n\r]/g, function(c)
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{
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return "&#" +c.charCodeAt(0) + ";"
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});
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}
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// copied from ACE
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function _processSpaces(s)
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{
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var doesWrap = true;
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if (s.indexOf("<") < 0 && !doesWrap)
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{
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// short-cut
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return s.replace(/ /g, ' ');
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}
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var parts = [];
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s.replace(/<[^>]*>?| |[^ <]+/g, function (m)
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{
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parts.push(m);
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});
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if (doesWrap)
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{
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var endOfLine = true;
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var beforeSpace = false;
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// last space in a run is normal, others are nbsp,
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// end of line is nbsp
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for (var i = parts.length - 1; i >= 0; i--)
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{
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var p = parts[i];
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if (p == " ")
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{
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if (endOfLine || beforeSpace) parts[i] = ' ';
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endOfLine = false;
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beforeSpace = true;
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}
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else if (p.charAt(0) != "<")
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{
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endOfLine = false;
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beforeSpace = false;
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}
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}
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// beginning of line is nbsp
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for (var i = 0; i < parts.length; i++)
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{
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var p = parts[i];
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if (p == " ")
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{
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parts[i] = ' ';
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break;
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}
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else if (p.charAt(0) != "<")
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{
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break;
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}
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}
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}
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else
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{
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for (var i = 0; i < parts.length; i++)
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{
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var p = parts[i];
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if (p == " ")
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{
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parts[i] = ' ';
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}
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}
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}
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return parts.join('');
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}
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// copied from ACE
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var _REGEX_WORDCHAR = /[\u0030-\u0039\u0041-\u005A\u0061-\u007A\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u00FF\u0100-\u1FFF\u3040-\u9FFF\uF900-\uFDFF\uFE70-\uFEFE\uFF10-\uFF19\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFDC]/;
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var _REGEX_SPACE = /\s/;
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var _REGEX_URLCHAR = new RegExp('(' + /[-:@a-zA-Z0-9_.,~%+\/\\?=&#;()$]/.source + '|' + _REGEX_WORDCHAR.source + ')');
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var _REGEX_URL = new RegExp(/(?:(?:https?|s?ftp|ftps|file|smb|afp|nfs|(x-)?man|gopher|txmt):\/\/|mailto:)/.source + _REGEX_URLCHAR.source + '*(?![:.,;])' + _REGEX_URLCHAR.source, 'g');
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// returns null if no URLs, or [[startIndex1, url1], [startIndex2, url2], ...]
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function _findURLs(text)
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{
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_REGEX_URL.lastIndex = 0;
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var urls = null;
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var execResult;
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while ((execResult = _REGEX_URL.exec(text)))
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{
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urls = (urls || []);
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var startIndex = execResult.index;
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var url = execResult[0];
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urls.push([startIndex, url]);
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}
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return urls;
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}
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