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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
* Copyright (C) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
WebInspector.TextEditorHighlighter = function(textModel, damageCallback)
{
this._textModel = textModel;
this._tokenizer = WebInspector.SourceTokenizer.Registry.getInstance().getTokenizer("text/html");
this._damageCallback = damageCallback;
this._highlightChunkLimit = 1000;
this.reset();
}
WebInspector.TextEditorHighlighter.prototype = {
set mimeType(mimeType)
{
var tokenizer = WebInspector.SourceTokenizer.Registry.getInstance().getTokenizer(mimeType);
if (tokenizer) {
this._tokenizer = tokenizer;
this._tokenizerConditionStringified = JSON.stringify(this._tokenizer.initialCondition);
}
},
set highlightChunkLimit(highlightChunkLimit)
{
this._highlightChunkLimit = highlightChunkLimit;
},
reset: function()
{
this._lastHighlightedLine = 0;
this._lastHighlightedColumn = 0;
this._tokenizerConditionStringified = JSON.stringify(this._tokenizer.initialCondition);
},
highlight: function(endLine, opt_forceRun)
{
// First check if we have work to do.
if (endLine <= this._lastHighlightedLine)
return;
this._requestedEndLine = endLine;
if (this._highlightTimer && !opt_forceRun) {
// There is a timer scheduled, it will catch the new job based on the new endLine set.
return;
}
// Do small highlight synchronously. This will provide instant highlight on PageUp / PageDown, gentle scrolling.
this._highlightInChunks(endLine);
// Schedule tail highlight if necessary.
if (this._lastHighlightedLine < endLine)
this._highlightTimer = setTimeout(this._highlightInChunks.bind(this, endLine), 100);
},
updateHighlight: function(startLine, endLine)
{
if (this._lastHighlightedLine < startLine) {
// Highlighter did not reach this point yet, nothing to update. It will reach it on subsequent timer tick and do the job.
return false;
}
var savedLastHighlightedLine = this._lastHighlightedLine;
var savedLastHighlightedColumn = this._lastHighlightedColumn;
var savedTokenizerCondition = this._tokenizerConditionStringified;
this._lastHighlightedLine = startLine;
this._lastHighlightedColumn = 0;
// Restore highlighter context taken from the previous line.
var attributes = this._textModel.getAttribute(startLine - 1, "highlight") || {};
this._tokenizerConditionStringified = attributes.postConditionStringified || JSON.stringify(this._tokenizer.initialCondition);
// Try to update highlight synchronously.
this._highlightLines(endLine);
if (this._lastHighlightedLine >= this._textModel.linesCount) {
// All is done up to the end.
return true;
}
var attributes1 = this._textModel.getAttribute(this._lastHighlightedLine - 1, "highlight") || {};
var attributes2 = this._textModel.getAttribute(this._lastHighlightedLine, "highlight") || {};
if (this._lastHighlightedColumn === 0 && attributes2.preConditionStringified && attributes1.postConditionStringified === attributes2.preConditionStringified) {
// Highlighting ended ahead of time. Restore previously saved state, unless we have done more than it was before.
if (savedLastHighlightedLine >= this._lastHighlightedLine) {
this._lastHighlightedLine = savedLastHighlightedLine;
this._lastHighlightedColumn = savedLastHighlightedColumn;
this._tokenizerConditionStringified = savedTokenizerCondition;
}
return true;
} else {
// If failed to update highlight synchronously, invalidate highlight data for the subsequent lines.
if (this._lastHighlightedColumn === 0)
this._textModel.removeAttribute(this._lastHighlightedLine, "highlight");
for (var i = this._lastHighlightedLine + 1; i < this._textModel.linesCount; ++i)
this._textModel.removeAttribute(i, "highlight");
// Continue highlighting on subsequent timer ticks.
this._requestedEndLine = endLine;
if (!this._highlightTimer)
this._highlightTimer = setTimeout(this._highlightInChunks.bind(this, endLine), 100);
return false;
}
},
_highlightInChunks: function(endLine)
{
delete this._highlightTimer;
// First we always check if we have work to do. Could be that user scrolled back and we can quit.
if (this._requestedEndLine <= this._lastHighlightedLine)
return;
if (this._requestedEndLine !== endLine) {
// User keeps updating the job in between of our timer ticks. Just reschedule self, don't eat CPU (they must be scrolling).
this._highlightTimer = setTimeout(this._highlightInChunks.bind(this, this._requestedEndLine), 100);
return;
}
// The textModel may have been already updated.
if (this._requestedEndLine > this._textModel.linesCount)
this._requestedEndLine = this._textModel.linesCount;
this._highlightLines(this._requestedEndLine);
// Schedule tail highlight if necessary.
if (this._lastHighlightedLine < this._requestedEndLine)
this._highlightTimer = setTimeout(this._highlightInChunks.bind(this, this._requestedEndLine), 10);
},
_highlightLines: function(endLine)
{
// Tokenizer is stateless and reused across viewers, restore its condition before highlight and save it after.
this._tokenizer.condition = JSON.parse(this._tokenizerConditionStringified);
var tokensCount = 0;
for (var lineNumber = this._lastHighlightedLine; lineNumber < endLine; ++lineNumber) {
var line = this._textModel.line(lineNumber);
this._tokenizer.line = line;
if (this._lastHighlightedColumn === 0) {
var attributes = {};
attributes.preConditionStringified = JSON.stringify(this._tokenizer.condition);
this._textModel.setAttribute(lineNumber, "highlight", attributes);
} else
var attributes = this._textModel.getAttribute(lineNumber, "highlight");
// Highlight line.
do {
var newColumn = this._tokenizer.nextToken(this._lastHighlightedColumn);
var tokenType = this._tokenizer.tokenType;
if (tokenType)
attributes[this._lastHighlightedColumn] = { length: newColumn - this._lastHighlightedColumn, tokenType: tokenType };
this._lastHighlightedColumn = newColumn;
if (++tokensCount > this._highlightChunkLimit)
break;
} while (this._lastHighlightedColumn < line.length);
if (this._lastHighlightedColumn < line.length) {
// Too much work for single chunk - exit.
break;
} else {
this._lastHighlightedColumn = 0;
attributes.postConditionStringified = JSON.stringify(this._tokenizer.condition);
var nextAttributes = this._textModel.getAttribute(lineNumber + 1, "highlight") || {};
if (nextAttributes.preConditionStringified === attributes.postConditionStringified) {
// Following lines are up to date, no need to re-highlight.
++lineNumber;
break;
}
}
}
this._damageCallback(this._lastHighlightedLine, lineNumber);
this._tokenizerConditionStringified = JSON.stringify(this._tokenizer.condition);
this._lastHighlightedLine = lineNumber;
}
}
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