105 lines
2.6 KiB
JavaScript
105 lines
2.6 KiB
JavaScript
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/* jslint node: true */
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'use strict';
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var assert = require('assert');
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var _ = require('lodash');
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exports.wordWrapText = wordWrapText;
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function wordWrapText(text, options) {
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//
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// options.*:
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// width : word wrap width
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// tabHandling : expand (default=expand)
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// tabWidth : tab width if tabHandling is 'expand' (default=4)
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//
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assert(_.isObject(options), 'Missing options!');
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assert(_.isNumber(options.width), 'Missing options.width!');
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options.tabHandling = options.tabHandling || 'expand';
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if(!_.isNumber(options.tabWidth)) {
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options.tabWidth = 4;
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}
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//
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// Notes
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// * Sublime Text 3 for example considers spaces after a word
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// part of said word. For example, "word " would be wraped
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// in it's entirity.
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//
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// * Tabs in Sublime Text 3 are also treated as a word, so, e.g.
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// "\t" may resolve to " " and must fit within the space.
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//
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// * If a word is ultimately too long to fit, break it up until it does.
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//
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// RegExp below is JavaScript '\s' minus the '\t'
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//
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var re = new RegExp(
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'\t|[ \f\n\r\v\u00a0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006' +
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'\u2007\u2008\u2009\u200a\u2028\u2029\u202f\u205f\u3000]', 'g');
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var m;
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var wordStart = 0;
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var results = { wrapped : [ '' ] };
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var i = 0;
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var word;
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var wordLen;
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function expandTab(col) {
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var remainWidth = options.tabWidth - (col % options.tabWidth);
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return new Array(remainWidth).join('\t');
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}
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// :TODO: support wrapping pipe code text (e.g. ignore color codes, expand MCI codes)
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function addWord() {
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word.match(new RegExp('.{0,' + options.width + '}', 'g')).forEach(function wrd(w) {
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//wordLen = self.getStringLength(w);
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if(results.wrapped[i].length + w.length > options.width) {
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//if(results.wrapped[i].length + wordLen > width) {
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if(0 === i) {
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results.firstWrapRange = { start : wordStart, end : wordStart + w.length };
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//results.firstWrapRange = { start : wordStart, end : wordStart + wordLen };
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}
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results.wrapped[++i] = w;
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} else {
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results.wrapped[i] += w;
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}
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});
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}
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while((m = re.exec(text)) !== null) {
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word = text.substring(wordStart, re.lastIndex - 1);
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switch(m[0].charAt(0)) {
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case ' ' :
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word += m[0];
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break;
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case '\t' :
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//
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// Expand tab given position
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//
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// Nice info here: http://c-for-dummies.com/blog/?p=424
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//
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if('expand' === options.tabHandling) {
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word += expandTab(results.wrapped[i].length + word.length) + '\t';
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} else {
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word += m[0];
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}
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break;
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}
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addWord();
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wordStart = re.lastIndex + m[0].length - 1;
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}
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//
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// Remainder
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//
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word = text.substring(wordStart);
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addWord();
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return results;
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}
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