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220 lines
7.2 KiB
JavaScript
220 lines
7.2 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) 2010, 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 TokenIterator = require("../token_iterator").TokenIterator;
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var Range = require("../range").Range;
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function BracketMatch() {
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this.findMatchingBracket = function(position, chr) {
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if (position.column == 0) return null;
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var charBeforeCursor = chr || this.getLine(position.row).charAt(position.column-1);
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if (charBeforeCursor == "") return null;
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var match = charBeforeCursor.match(/([\(\[\{])|([\)\]\}])/);
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if (!match)
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return null;
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if (match[1])
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return this.$findClosingBracket(match[1], position);
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else
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return this.$findOpeningBracket(match[2], position);
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};
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this.getBracketRange = function(pos) {
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var line = this.getLine(pos.row);
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var before = true, range;
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var chr = line.charAt(pos.column-1);
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var match = chr && chr.match(/([\(\[\{])|([\)\]\}])/);
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if (!match) {
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chr = line.charAt(pos.column);
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pos = {row: pos.row, column: pos.column + 1};
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match = chr && chr.match(/([\(\[\{])|([\)\]\}])/);
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before = false;
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}
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if (!match)
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return null;
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if (match[1]) {
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var bracketPos = this.$findClosingBracket(match[1], pos);
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if (!bracketPos)
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return null;
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range = Range.fromPoints(pos, bracketPos);
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if (!before) {
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range.end.column++;
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range.start.column--;
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}
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range.cursor = range.end;
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} else {
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var bracketPos = this.$findOpeningBracket(match[2], pos);
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if (!bracketPos)
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return null;
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range = Range.fromPoints(bracketPos, pos);
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if (!before) {
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range.start.column++;
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range.end.column--;
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}
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range.cursor = range.start;
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}
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return range;
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};
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this.$brackets = {
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")": "(",
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"(": ")",
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"]": "[",
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"[": "]",
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"{": "}",
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"}": "{"
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};
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this.$findOpeningBracket = function(bracket, position, typeRe) {
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var openBracket = this.$brackets[bracket];
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var depth = 1;
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var iterator = new TokenIterator(this, position.row, position.column);
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var token = iterator.getCurrentToken();
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if (!token)
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token = iterator.stepForward();
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if (!token)
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return;
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if (!typeRe){
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typeRe = new RegExp(
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"(\\.?" +
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token.type.replace(".", "\\.").replace("rparen", ".paren")
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+ ")+"
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);
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}
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// Start searching in token, just before the character at position.column
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var valueIndex = position.column - iterator.getCurrentTokenColumn() - 2;
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var value = token.value;
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while (true) {
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while (valueIndex >= 0) {
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var chr = value.charAt(valueIndex);
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if (chr == openBracket) {
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depth -= 1;
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if (depth == 0) {
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return {row: iterator.getCurrentTokenRow(),
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column: valueIndex + iterator.getCurrentTokenColumn()};
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}
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}
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else if (chr == bracket) {
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depth += 1;
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}
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valueIndex -= 1;
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}
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// Scan backward through the document, looking for the next token
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// whose type matches typeRe
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do {
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token = iterator.stepBackward();
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} while (token && !typeRe.test(token.type));
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if (token == null)
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break;
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value = token.value;
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valueIndex = value.length - 1;
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}
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return null;
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};
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this.$findClosingBracket = function(bracket, position, typeRe) {
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var closingBracket = this.$brackets[bracket];
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var depth = 1;
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var iterator = new TokenIterator(this, position.row, position.column);
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var token = iterator.getCurrentToken();
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if (!token)
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token = iterator.stepForward();
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if (!token)
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return;
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if (!typeRe){
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typeRe = new RegExp(
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"(\\.?" +
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token.type.replace(".", "\\.").replace("lparen", ".paren")
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+ ")+"
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);
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}
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// Start searching in token, after the character at position.column
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var valueIndex = position.column - iterator.getCurrentTokenColumn();
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while (true) {
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var value = token.value;
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var valueLength = value.length;
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while (valueIndex < valueLength) {
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var chr = value.charAt(valueIndex);
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if (chr == closingBracket) {
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depth -= 1;
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if (depth == 0) {
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return {row: iterator.getCurrentTokenRow(),
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column: valueIndex + iterator.getCurrentTokenColumn()};
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}
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}
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else if (chr == bracket) {
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depth += 1;
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}
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valueIndex += 1;
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}
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// Scan forward through the document, looking for the next token
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// whose type matches typeRe
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do {
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token = iterator.stepForward();
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} while (token && !typeRe.test(token.type));
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if (token == null)
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break;
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valueIndex = 0;
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}
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return null;
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};
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}
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exports.BracketMatch = BracketMatch;
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});
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