/*jshint node:true */
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/*
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The MIT License (MIT)
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Copyright (c) 2007-2018 Einar Lielmanis, Liam Newman, and contributors.
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation files
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(the "Software"), to deal in the Software without restriction,
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including without limitation the rights to use, copy, modify, merge,
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publish, distribute, sublicense, and/or sell copies of the Software,
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and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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'use strict';
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var Pattern = require('../core/pattern').Pattern;
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function WhitespacePattern(input_scanner, parent) {
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Pattern.call(this, input_scanner, parent);
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if (parent) {
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this._line_regexp = this._input.get_regexp(parent._line_regexp);
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} else {
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this.__set_whitespace_patterns('', '');
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}
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this.newline_count = 0;
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this.whitespace_before_token = '';
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}
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WhitespacePattern.prototype = new Pattern();
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WhitespacePattern.prototype.__set_whitespace_patterns = function(whitespace_chars, newline_chars) {
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whitespace_chars += '\\t ';
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newline_chars += '\\n\\r';
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this._match_pattern = this._input.get_regexp(
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'[' + whitespace_chars + newline_chars + ']+', true);
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this._newline_regexp = this._input.get_regexp(
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'\\r\\n|[' + newline_chars + ']');
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};
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WhitespacePattern.prototype.read = function() {
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this.newline_count = 0;
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this.whitespace_before_token = '';
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var resulting_string = this._input.read(this._match_pattern);
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if (resulting_string === ' ') {
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this.whitespace_before_token = ' ';
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} else if (resulting_string) {
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var matches = this.__split(this._newline_regexp, resulting_string);
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this.newline_count = matches.length - 1;
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this.whitespace_before_token = matches[this.newline_count];
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}
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return resulting_string;
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};
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WhitespacePattern.prototype.matching = function(whitespace_chars, newline_chars) {
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var result = this._create();
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result.__set_whitespace_patterns(whitespace_chars, newline_chars);
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result._update();
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return result;
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};
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WhitespacePattern.prototype._create = function() {
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return new WhitespacePattern(this._input, this);
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};
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WhitespacePattern.prototype.__split = function(regexp, input_string) {
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regexp.lastIndex = 0;
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var start_index = 0;
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var result = [];
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var next_match = regexp.exec(input_string);
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while (next_match) {
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result.push(input_string.substring(start_index, next_match.index));
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start_index = next_match.index + next_match[0].length;
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next_match = regexp.exec(input_string);
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}
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if (start_index < input_string.length) {
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result.push(input_string.substring(start_index, input_string.length));
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} else {
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result.push('');
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}
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return result;
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};
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module.exports.WhitespacePattern = WhitespacePattern;
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