128 lines
4.8 KiB
JavaScript
128 lines
4.8 KiB
JavaScript
/* jshint browser: true, devel: true */
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/**
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* preg_replace (from PHP) in JavaScript!
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*
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* This is basically a pattern replace. You can use a regex pattern to search and
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* another for the replace. For more information see the PHP docs on the original
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* function (http://php.net/manual/en/function.preg-replace.php), and for more on
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* JavaScript flavour regex visit http://www.regular-expressions.info/javascript.html
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*
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* NOTE: Unlike the PHP version, this function only deals with string inputs. No arrays.
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*
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* @author William Duyck <fuzzyfox0@gmail.com>
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* @license http://www.mozilla.org/MPL/2.0/ Mozilla Public License 2.0
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*
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* @param {String} pattern The pattern to search for.
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* @param {String} replace The string to replace.
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* @param {String} subject The string to search and replace.
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* @param {Integer} limit The maximum possible replacements.
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* @return {String} If matches are found, the new subject will be returned.
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*/
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var preg_replace=function(a,b,c,d){void 0===d&&(d=-1);var e=a.substr(a.lastIndexOf(a[0])+1),f=a.substr(1,a.lastIndexOf(a[0])-1),g=RegExp(f,e),i=[],j=0,k=0,l=c,m=[];if(-1===d){do m=g.exec(c),null!==m&&i.push(m);while(null!==m&&-1!==e.indexOf("g"))}else i.push(g.exec(c));for(j=i.length-1;j>-1;j--){for(m=b,k=i[j].length;k>-1;k--)m=m.replace("${"+k+"}",i[j][k]).replace("$"+k,i[j][k]).replace("\\"+k,i[j][k]);l=l.replace(i[j][0],m)}return l};
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/**
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* Basic Markdown Parser
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*
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* This function parses a small subset of the Markdown language as defined by
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* [John Gruber](http://daringfireball.net/projects/markdown). It's very basic
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* and needs to be refactored a little, and there are plans to add more support
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* for the rest of the language in the near future.
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*
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* This implimentation is based loosely on
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* [slimdown.php](https://gist.github.com/jbroadway/2836900) by Johnny Broadway.
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*
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* @version 0.1
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* @author William Duyck <fuzzyfox0@gmail.com>
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* @license http://www.mozilla.org/MPL/2.0/ Mozilla Public License 2.0
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*
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* @param {String} str A Markdown string to be converted to HTML.
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* @return {String} The HTML for the given Markdown.
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*/
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var markdown_parser = function(str){
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var rules = [
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// headers
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['/(#+)(.*)/g', function(chars, header){
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var level = chars.length;
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return '<h'+level+'>'+header.trim()+'</h'+level+'>';
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}],
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// images
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// ['/\\!\\[([^\\[]+)\\]\\(([^\\(]+)\\)/g', '<img src=\"\\2\" alt=\"\\1\" />'],
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// link
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['/\\[([^\\[]+)\\]\\(([^\\(]+)\\)/g', '<a href=\"\\2\">\\1</a>'],
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// bold
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['/(\\*\\*|__)(.*?)\\1/g', '<strong>\\2</strong>'],
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// emphasis
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['/(\\*|_)(.*?)\\1/g', '<em>\\2</em>'],
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// strike
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['/(\\~\\~)(.*?)\\1/g', '<del>\\2</del>'],
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// quote
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['/\\:\\"(.*?)\\"\\:/g', '<q>\\1</q>'],
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// unordered list
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// ['/\\n\\*(.*)/g', function(item){
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// return '<ul>\n<li>'+item.trim()+'</li>\n</ul>';
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// }],
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// ordered list
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// ['/\\n[0-9]+\\.(.*)/g', function(item){
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// return '<ol>\n<li>'+item.trim()+'</li>\n</ol>';
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// }],
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// blockquote
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['/\\n\\>(.*)/g', function(str){
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return '<blockquote>'+str.trim()+'</blockquote>';
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}]
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// paragraphs
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// ['/\\n[^\\n]+\\n/g', function(line){
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// line = line.trim();
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// if(line[0] === '<'){
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// return line;
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// }
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// return '\n<p>'+line+'</p>\n';
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// }]
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], fixes = [
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['/<\\/ul>\n<ul>/g', '\n'],
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['/<\\/ol>\n<ol>/g', '\n'],
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['/<\\/blockquote>\n<blockquote>/g', "\n"]
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];
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var parse_line = function(str){
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str = "\n" + str.trim() + "\n";
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for(var i = 0, j = rules.length; i < j; i++){
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if(typeof rules[i][1] == 'function') {
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var _flag = rules[i][0].substr(rules[i][0].lastIndexOf(rules[i][0][0])+1),
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_pattern = rules[i][0].substr(1, rules[i][0].lastIndexOf(rules[i][0][0])-1),
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reg = new RegExp(_pattern, _flag);
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var matches = reg.exec(str);
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if(matches !== null){
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if(matches.length > 1){
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str = preg_replace(rules[i][0], rules[i][1](matches[1], matches[2]), str);
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}
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else
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{
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str = preg_replace(rules[i][0], rules[i][1](matches[0]), str);
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}
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}
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}
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else {
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str = preg_replace(rules[i][0], rules[i][1], str);
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}
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}
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return str.trim();
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};
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str = str.split('\n');
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var rtn = [];
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for(var i = 0, j = str.length; i < j; i++){
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rtn.push(parse_line(str[i]));
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}
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rtn = rtn.join('\n');
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for(i = 0, j = fixes.length; i < j; i++){
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rtn = preg_replace(fixes[i][0], fixes[i][1], rtn);
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}
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return rtn;
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};
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