/
jst.js
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/
jst.js
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/**
* Node-jst
* Copyright(c) 2011 Shaun Li <shonhen@gmail.com>
* MIT Licensed
*/
var fs = require('fs'),
filters = require('./filters'),
hash = require('./hash'),
locales;
try {
locales = requires('locales');
} catch(e) {
locales = {
configure: function(){},
gettext : function(s) { return s },
ngettext : function(s) { return s}
}
}
exports.version = '0.0.10';
var _cache = {},
_files = {},
_options = {
useIt: false
};
exports.configure = function(options) {
for (var prop in options) {
_options[prop] = options[prop];
if (prop === 'locales')
locales.configure(options[prop]);
}
}
exports.addFilter = function(name, fn) {
filters.filters[name] = fn;
}
exports.addFilters = function(newFilters) {
for (var name in newFilters)
filters.filters[name] = newFilters[name];
}
// compiler
const prefixes = {
n: {s: '"', c: '', v: ''},
s: {s: '', c: '"; ', v: '" + '},
c: {s: ' out += "', c: ' ', v: ' out += '},
v: {s: ' + "', c: '; ', v: ' + '},
end: {s: '"; ', c: ' ', v: '; '}
},
codere = /\{[%\{] (.+?) [%\}]\}/g;
var compile = exports.compile = function(ctx) {
var m, i = 0, code = 'var out = ', last = 'n';
_options.useIt = /{{ (e\()?it\./.test(ctx);
ctx = ctx.replace(/[\t\r\n]/g, '').replace(/\{#.+?#\}/g, '')
if (!_options.useIt) {
code += '""; with(it) {';
last = 'c';
}
while ((m = codere.exec(ctx)) !== null) {
if (m.index > 0 && m.index > i) {
code += prefixes[last]['s'] + ctx.substring(i, m.index).replace(/"/g, '\\"');
last = 's';
}
if (m[0].indexOf('{%') === 0) {
code += prefixes[last]['c'] + m[1];
if (/\)$/.test(m[1])) code += ';';
last = 'c';
} else if (m[0].indexOf('{{') === 0) {
code += prefixes[last]['v'] + filters.convert(m[1]);
last = 'v';
}
i = m.index + m[0].length;
}
if (i < ctx.length) {
code += prefixes[last]['s'] + ctx.substring(i).replace(/"/g, '\\"');
last = 's';
}
code += prefixes['end'][last];
if (!_options.useIt)
code += '} ';
code += 'return out;';
//console.log(code);
var fn = new Function('it, _, _n, filters', code);
return function(args) {
return fn.call(this, args, locales.gettext, locales.ngettext, filters.filters);
}
}
var render = exports.render = function(ctx, args) {
var ck = hash.md5sum(ctx),
fn = _cache[ck];
if (typeof fn === 'undefined') {
fn = _cache[ck] = compile(ctx);
}
return fn(args);
}
var renderFile = exports.renderFile = function(filename, args, fn) {
if (typeof args === 'function') {
fn = args;
args = {};
}
var fk = hash.md5sum(filename);
fs.stat(filename, function(err, stats) {
if (err)
return fn(err);
_files[fk] = _files[fk] || {};
if (isempty(_files[fk]) || _files[fk].ctime < stats.ctime) {
fs.readFile(filename, 'utf8', function(err, ctx) {
if (err)
return fn(err);
_files[fk].ctime = stats.ctime;
_files[fk].ctx = ctx;
try {
fn(null, render(ctx, args));
} catch(e) { fn(e); }
});
} else {
try {
fn(null, render(_files[fk].ctx, args));
} catch(e) { fn(e); }
}
});
}
function isempty(o) {
for (var prop in o)
if (o.hasOwnProperty(prop))
return false;
return true;
}