Android: HTML tags and localized strings for Titanium SDK.

bbcode2html.js

/* Escapes a string for use with regular expressions */
function escapeString(input) {
    return input.replace(/([\,\!\\\^\$\{\}\[\]\(\)\.\*\+\?\|\<\>\-\&])/g,
                         function(c){return "\\" + c;});
}

/* replaces all */
function replaceAll(search, input, replacement, ignore) {
   return input.replace(
       new RegExp(escapeString(search), "g"+(ignore?"i":"")), 
       replacement);
};

/* Check if an index is event */
function isIndexEven(val, index, context) {
    return (index % 2 === 0);
};

/* Sets the attributes on an HTML string given a set of attributes */
function setHtmlAttrs(htmlCode, attrs) {
    return attrs.reduce(function(htmlCode, attr, index) {
        var re = new RegExp('\\$' + (index + 1), 'g');
        return htmlCode.replace(re, attr);
    }, htmlCode);
};

/* Gets the html tag(s) for a bbCode tag */
function eleFragsToHtml(isClosing, elementFragments) {
    return '<' + elementFragments.map(function(frag) {
        return (isClosing ? '/' + frag.join(' ') : frag.join(' '));
    }).join('><') + '>';
};

/* Converts a single bbCode Tag to Html */
function bbTagToHtmlTag(rules, tag) {
    var attrs = tag.replace(/\[\w+|\]/g, '').trim().split(' ');
    var key = tag.replace(/\[\/?| .+|\]/g, '');
    var isClosing = /\//.test(tag);
    var htmlTemplate = (isClosing ? rules[key].map(function(rule) { 
                                        return rule.filter(isIndexEven);
                                }).reverse()
                        : rules[key]);
    var output = eleFragsToHtml(isClosing, htmlTemplate);    
    return setHtmlAttrs(output, attrs);
};

var defaultRules = {
    'b': [ ['strong'] ],
    'bg': [ ['span', 'style\"background-color:$1\"'] ],
    'big': [ ['span', 'style=\"font-size: larger;\"'] ],
    'c': [ ['span', 'style=\"color:$1\"'] ],
    'f': [ ['span', 'style=\"font-family:$1\"'] ],
    'i': [ ['em'] ],
    'img': [ ['a', 'href=\"$1\"'],
             ['img', 'src=\"$1\" style=\"max-height: 200px; max-width: 200px;\"'] ],
    'p': [ ['pre'] ],
    'small': [ ['small'] ],
    's': [ ['span', 'style=\"text-decoration: line-through;\"'] ]
};
// source: http://codereview.stackexchange.com/questions/46751/bbcode-to-html-converter-using-functional-programming
/* Converts bbCode to HTML */
exports.toHtml = function(bbCode, rules) {
	rules = _.defaults(rules || {}, defaultRules);
    /* Creates the Regular Expression Search */
    var regex = new RegExp( ['\\[.?[',
                             Object.keys(rules).join('|'), 
                             '].*?\\]'].join(''), 'g' );
    return bbCode.match(regex)
                 .reduce(function(htmlCode, tag) {
                     return replaceAll(tag, 
                                      htmlCode, 
                                      bbTagToHtmlTag(rules, tag));
                 }, bbCode);
};

index.js

var html2as = require('nl.fokkezb.html2as'),
    bbcode2html = require('bbcode2html');

html2as(bbcode2html.toHtml(L('hello_world')), function handle(err, as) {
	if (err) {
		Ti.API.error('html2as:', err);
	} else {
		$.myLabel.attributedString = as;
	}
});

strings.xml

<resources>
	<string name="hello_world">Hello [b]world[/b]</string>
</resources>