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https://github.com/overleaf/overleaf.git
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163 lines
5.8 KiB
JavaScript
163 lines
5.8 KiB
JavaScript
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/* ***** BEGIN LICENSE BLOCK *****
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* Distributed under the BSD license:
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*
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* Copyright (c) 2012, Ajax.org B.V.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Ajax.org B.V. nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ***** END LICENSE BLOCK ***** */
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define(function(require, exports, module) {
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"use strict";
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var oop = require("../../lib/oop");
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var BaseFoldMode = require("./fold_mode").FoldMode;
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var Range = require("../../range").Range;
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var TokenIterator = require("../../token_iterator").TokenIterator;
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var FoldMode = exports.FoldMode = function() {};
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oop.inherits(FoldMode, BaseFoldMode);
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(function() {
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this.foldingStartMarker = /^\s*\\(begin)|(section|subsection)\b|{\s*$/;
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this.foldingStopMarker = /^\s*\\(end)\b|^\s*}/;
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this.getFoldWidgetRange = function(session, foldStyle, row) {
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var line = session.doc.getLine(row);
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var match = this.foldingStartMarker.exec(line);
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if (match) {
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if (match[1])
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return this.latexBlock(session, row, match[0].length - 1);
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if (match[2])
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return this.latexSection(session, row, match[0].length - 1);
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return this.openingBracketBlock(session, "{", row, match.index);
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}
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var match = this.foldingStopMarker.exec(line);
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if (match) {
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if (match[1])
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return this.latexBlock(session, row, match[0].length - 1);
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return this.closingBracketBlock(session, "}", row, match.index + match[0].length);
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}
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};
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this.latexBlock = function(session, row, column) {
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var keywords = {
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"\\begin": 1,
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"\\end": -1
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};
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var stream = new TokenIterator(session, row, column);
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var token = stream.getCurrentToken();
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if (!token || token.type !== "keyword")
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return;
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var val = token.value;
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var dir = keywords[val];
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var getType = function() {
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var token = stream.stepForward();
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var type = token.type == "lparen" ?stream.stepForward().value : "";
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if (dir === -1) {
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stream.stepBackward();
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if (type)
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stream.stepBackward();
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}
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return type;
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};
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var stack = [getType()];
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var startColumn = dir === -1 ? stream.getCurrentTokenColumn() : session.getLine(row).length;
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var startRow = row;
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stream.step = dir === -1 ? stream.stepBackward : stream.stepForward;
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while(token = stream.step()) {
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if (token.type !== "keyword")
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continue;
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var level = keywords[token.value];
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if (!level)
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continue;
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var type = getType();
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if (level === dir)
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stack.unshift(type);
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else if (stack.shift() !== type || !stack.length)
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break;
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}
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if (stack.length)
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return;
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var row = stream.getCurrentTokenRow();
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if (dir === -1)
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return new Range(row, session.getLine(row).length, startRow, startColumn);
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stream.stepBackward();
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return new Range(startRow, startColumn, row, stream.getCurrentTokenColumn());
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};
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this.latexSection = function(session, row, column) {
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var keywords = ["\\subsection", "\\section", "\\begin", "\\end"];
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var stream = new TokenIterator(session, row, column);
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var token = stream.getCurrentToken();
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if (!token || token.type != "keyword")
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return;
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var startLevel = keywords.indexOf(token.value);
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var stackDepth = 0
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var endRow = row;
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while(token = stream.stepForward()) {
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if (token.type !== "keyword")
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continue;
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var level = keywords.indexOf(token.value);
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if (level >= 2) {
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if (!stackDepth)
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endRow = stream.getCurrentTokenRow() - 1;
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stackDepth += level == 2 ? 1 : - 1;
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if (stackDepth < 0)
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break
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} else if (level >= startLevel)
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break;
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}
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if (!stackDepth)
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endRow = stream.getCurrentTokenRow() - 1;
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while (endRow > row && !/\S/.test(session.getLine(endRow)))
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endRow--;
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return new Range(
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row, session.getLine(row).length,
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endRow, session.getLine(endRow).length
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);
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};
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}).call(FoldMode.prototype);
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});
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