mew-template/index.js

Precompile template to cmd module

var dot = require('dot');
var xtemplate = require('xtemplate');
var handlebars = require('handlebars');
var jstOld = require('./lib/jst-old');
var jst = require('./lib/jst');

var defaultSettings = {
    evaluate: /\{\{([\s\S]+?)\}\}/g,
    interpolate: /\{\{=([\s\S]+?)\}\}/g,
    encode: /\{\{!([\s\S]+?)\}\}/g,
    use: /\{\{#([\s\S]+?)\}\}/g,
    define: /\{\{##\s*([\w\.$]+)\s*(\:|=)([\s\S]+?)#\}\}/g,
    conditional: /\{\{\?(\?)?\s*([\s\S]*?)\s*\}\}/g,
    iterate: /\{\{~\s*(?:\}\}|([\s\S]+?)\s*\:\s*([\w$]+)\s*(?:\:\s*([\w$]+))?\s*\}\})/g,
    varname: 'it',
    strip: true,
    append: true,
    selfcontained: false
};
var braceSettings = {
    evaluate: /\<\%([\s\S]+?)\%\>/g,
    interpolate: /\<\%=([\s\S]+?)\%\>/g,
    encode: /\<\%!([\s\S]+?)\%\>/g,
    use: /\<\%#([\s\S]+?)\%\>/g,
    define: /\<\%##\s*([\w\.$]+)\s*(\:|=)([\s\S]+?)#\%\>/g,
    conditional: /\<\%\?(\?)?\s*([\s\S]*?)\s*\%\>/g,
    iterate: /\<\%~\s*(?:\%\>|([\s\S]+?)\s*\:\s*([\w$]+)\s*(?:\:\s*([\w$]+))?\s*\%\>)/g,
    varname: 'it',
    strip: true,
    append: true,
    selfcontained: false
};

function mix() {
    var args = [].slice.call(arguments);
    var ret = args[0];
    var rest = args.slice(1);

    rest.forEach(function(o) {
        for (var k in o) {
            if (o.hasOwnProperty(k)) {
                ret[k] = o[k];
            }
        }
    });

    return ret;
}

function substitute(str, o, regexp) {
    var SUBSTITUTE_REG = /\\?\@([^@@]+)\@/g;
    return str.replace(regexp || SUBSTITUTE_REG, function(match, name) {
        if (match.charAt(0) === '\\') {
            return match.slice(1);
        }
        return (o[name] === undefined) ? '' : o[name];
    });
}

module.exports = function(contents, options) {
    options = options || {};

    // {{}} or <%> only works with dot & jst
    var syntax = options.syntax || '{{}}';

    // dot jst handlebars xtemplate
    var engine = (options.engine || 'dot').toLowerCase();

    var compiled;
    var templateFn = 'var template = ';
    var defines = {
        templateFn: '',
        renderFn: 'template'
    };
    var tmpl = [
        'define(function () {',
        '  @templateFn@',
        '  return {',
        '    render: function (data) {',
        '      return @renderFn@(data || {});',
        '    }',
        '  };',
        '});'
    ].join('\n');

    // reset dot settings
    mix(dot.templateSettings, defaultSettings);

    if (engine == 'dot' && syntax == '<%%>') {
        mix(dot.templateSettings, braceSettings);
    }

    switch (engine) {
        case 'jst':
            // compitable with old template
            if (syntax == '<%%>') {
                templateFn += jstOld.compile(contents);
            } else {
                templateFn += jst.compile(contents);
            }
            break;
        case 'handlebars':
            compiled = handlebars.precompile(contents);

            templateFn += 'Handlebars.template(' + compiled + ')';
            break;
        case 'xtemplate':
            compiled = xtemplate.Compiler.compileToStr({
                content: contents
            });

            templateFn += 'new XTemplateRuntime(' + compiled + ')';
            break;
        case 'dot':
        default:
            templateFn += dot.compile(contents);
            break;
    }

    if (engine == 'xtemplate') {
        defines.renderFn = 'template.render';
    }

    defines.templateFn = templateFn + ';\n';

    return substitute(tmpl, defines);
};