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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;
}
WebInspector.TextEditorHighlighter.prototype = {
set mimeType(mimeType)
{
var tokenizer = WebInspector.SourceTokenizer.Registry.getInstance().getTokenizer(mimeType);
if (tokenizer)
this._tokenizer = tokenizer;
},
set highlightChunkLimit(highlightChunkLimit)
{
this._highlightChunkLimit = highlightChunkLimit;
},
highlight: function(endLine, opt_forceRun)
{
// First check if we have work to do.
var state = this._textModel.getAttribute(endLine - 1, "highlight");
if (state && state.postConditionStringified) {
// Last line is highlighted, just exit.
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;
}
// We will be highlighting. First rewind to the last highlighted line to gain proper highlighter context.
var startLine = endLine;
while (startLine > 0) {
var state = this._textModel.getAttribute(startLine - 1, "highlight");
if (state && state.postConditionStringified)
break;
startLine--;
}
// Do small highlight synchronously. This will provide instant highlight on PageUp / PageDown, gentle scrolling.
this._highlightInChunks(startLine, endLine);
},
updateHighlight: function(startLine, endLine)
{
// Start line was edited, we should highlight everything until endLine.
this._clearHighlightState(startLine);
if (startLine) {
var state = this._textModel.getAttribute(startLine - 1, "highlight");
if (!state || !state.postConditionStringified) {
// 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 restored = this._highlightLines(startLine, endLine);
if (!restored) {
for (var i = this._lastHighlightedLine; i < this._textModel.linesCount; ++i) {
var state = this._textModel.getAttribute(i, "highlight");
if (!state && i > endLine)
break;
this._textModel.setAttribute(i, "highlight-outdated", state);
this._textModel.removeAttribute(i, "highlight");
}
if (this._highlightTimer) {
clearTimeout(this._highlightTimer);
this._requestedEndLine = endLine;
this._highlightTimer = setTimeout(this._highlightInChunks.bind(this, this._lastHighlightedLine, this._requestedEndLine), 10);
}
}
return restored;
},
_highlightInChunks: function(startLine, endLine)
{
delete this._highlightTimer;
// First we always check if we have work to do. Could be that user scrolled back and we can quit.
var state = this._textModel.getAttribute(this._requestedEndLine - 1, "highlight");
if (state && state.postConditionStringified)
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, startLine, this._requestedEndLine), 100);
return;
}
// The textModel may have been already updated.
if (this._requestedEndLine > this._textModel.linesCount)
this._requestedEndLine = this._textModel.linesCount;
this._highlightLines(startLine, this._requestedEndLine);
// Schedule tail highlight if necessary.
if (this._lastHighlightedLine < this._requestedEndLine)
this._highlightTimer = setTimeout(this._highlightInChunks.bind(this, this._lastHighlightedLine, this._requestedEndLine), 10);
},
_highlightLines: function(startLine, endLine)
{
// Restore highlighter context taken from previous line.
var state = this._textModel.getAttribute(startLine - 1, "highlight");
var postConditionStringified = state ? state.postConditionStringified : JSON.stringify(this._tokenizer.initialCondition);
var tokensCount = 0;
for (var lineNumber = startLine; lineNumber < endLine; ++lineNumber) {
var state = this._selectHighlightState(lineNumber, postConditionStringified);
if (state.postConditionStringified) {
// This line is already highlighted.
postConditionStringified = state.postConditionStringified;
} else {
var lastHighlightedColumn = 0;
if (state.midConditionStringified) {
lastHighlightedColumn = state.lastHighlightedColumn;
postConditionStringified = state.midConditionStringified;
}
var line = this._textModel.line(lineNumber);
this._tokenizer.line = line;
this._tokenizer.condition = JSON.parse(postConditionStringified);
// Highlight line.
do {
var newColumn = this._tokenizer.nextToken(lastHighlightedColumn);
var tokenType = this._tokenizer.tokenType;
if (tokenType)
state[lastHighlightedColumn] = { length: newColumn - lastHighlightedColumn, tokenType: tokenType };
lastHighlightedColumn = newColumn;
if (++tokensCount > this._highlightChunkLimit)
break;
} while (lastHighlightedColumn < line.length);
postConditionStringified = JSON.stringify(this._tokenizer.condition);
if (lastHighlightedColumn < line.length) {
// Too much work for single chunk - exit.
state.lastHighlightedColumn = lastHighlightedColumn;
state.midConditionStringified = postConditionStringified;
break;
} else {
delete state.lastHighlightedColumn;
delete state.midConditionStringified;
state.postConditionStringified = postConditionStringified;
}
}
var nextLineState = this._textModel.getAttribute(lineNumber + 1, "highlight");
if (nextLineState && nextLineState.preConditionStringified === state.postConditionStringified) {
// Following lines are up to date, no need re-highlight.
++lineNumber;
this._damageCallback(startLine, lineNumber);
// Advance the "pointer" to the last highlighted line within the given chunk.
for (; lineNumber < endLine; ++lineNumber) {
var state = this._textModel.getAttribute(lineNumber, "highlight");
if (!state || !state.postConditionStringified)
break;
}
this._lastHighlightedLine = lineNumber;
return true;
}
}
this._damageCallback(startLine, lineNumber);
this._lastHighlightedLine = lineNumber;
return false;
},
_selectHighlightState: function(lineNumber, preConditionStringified)
{
var state = this._textModel.getAttribute(lineNumber, "highlight");
if (state && state.preConditionStringified === preConditionStringified)
return state;
var outdatedState = this._textModel.getAttribute(lineNumber, "highlight-outdated");
if (outdatedState && outdatedState.preConditionStringified === preConditionStringified) {
// Swap states.
this._textModel.setAttribute(lineNumber, "highlight", outdatedState);
this._textModel.setAttribute(lineNumber, "highlight-outdated", state);
return outdatedState;
}
if (state)
this._textModel.setAttribute(lineNumber, "highlight-outdated", state);
state = {};
state.preConditionStringified = preConditionStringified;
this._textModel.setAttribute(lineNumber, "highlight", state);
return state;
},
_clearHighlightState: function(lineNumber)
{
this._textModel.removeAttribute(lineNumber, "highlight");
this._textModel.removeAttribute(lineNumber, "highlight-outdated");
}
}
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