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jade.js
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jade.js
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/*!
* Jade
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var Parser = require('./parser')
, Compiler = require('./compiler')
// if node
, fs = require('fs');
// end
/**
* Library version.
*/
exports.version = '0.12.1';
/**
* Intermediate JavaScript cache.
*/
var cache = exports.cache = {};
/**
* Expose self closing tags.
*/
exports.selfClosing = require('./self-closing');
/**
* Default supported doctypes.
*/
exports.doctypes = require('./doctypes');
/**
* Text filters.
*/
exports.filters = require('./filters');
/**
* Utilities.
*/
exports.utils = require('./utils');
/**
* Expose `Compiler`.
*/
exports.Compiler = Compiler;
/**
* Expose `Parser`.
*/
exports.Parser = Parser;
/**
* Nodes.
*/
exports.nodes = require('./nodes');
/**
* Render the given attributes object.
*
* @param {Object} obj
* @return {String}
* @api private
*/
function attrs(obj){
var buf = []
, terse = obj.terse;
delete obj.terse;
var keys = Object.keys(obj)
, len = keys.length;
if (len) {
buf.push('');
for (var i = 0; i < len; ++i) {
var key = keys[i]
, val = obj[key];
if (typeof val === 'boolean' || val === '' || val == null) {
if (val) {
terse
? buf.push(key)
: buf.push(key + '="' + key + '"');
}
} else {
buf.push(key + '="' + escape(val) + '"');
}
}
}
return buf.join(' ');
}
/**
* Escape the given string of `html`.
*
* @param {String} html
* @return {String}
* @api private
*/
function escape(html){
return String(html)
.replace(/&(?!\w+;)/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/"/g, '"');
}
/**
* Re-throw the given `err` in context to the
* `str` of jade, `filename`, and `lineno`.
*
* @param {Error} err
* @param {String} str
* @param {String} filename
* @param {String} lineno
* @api private
*/
function rethrow(err, str, filename, lineno){
var context = 3
, lines = str.split('\n')
, start = Math.max(lineno - context, 0)
, end = Math.min(lines.length, lineno + context);
// Error context
var context = lines.slice(start, end).map(function(line, i){
var curr = i + start + 1;
return (curr == lineno ? ' > ' : ' ')
+ curr
+ '| '
+ line;
}).join('\n');
// Alter exception message
err.path = filename;
err.message = (filename || 'Jade') + ':' + lineno
+ '\n' + context + '\n\n' + err.message;
throw err;
}
/**
* Parse the given `str` of jade and return a function body.
*
* @param {String} str
* @param {Object} options
* @return {String}
* @api private
*/
function parse(str, options){
var filename = options.filename;
try {
// Parse
var parser = new Parser(str, filename);
if (options.debug) parser.debug();
// Compile
var compiler = new (options.compiler || Compiler)(parser.parse(), options)
, js = compiler.compile();
// Debug compiler
if (options.debug) {
console.log('\n\x1b[1mCompiled Function\x1b[0m:\n\n%s', js.replace(/^/gm, ' '));
}
try {
return ''
+ attrs.toString() + '\n\n'
+ escape.toString() + '\n\n'
+ 'var buf = [];\n'
+ (options.self
? 'var self = locals || {}, __ = __ || locals.__;\n' + js
: 'with (locals || {}) {' + js + '}')
+ 'return buf.join("");';
} catch (err) {
process.compile(js, filename || 'Jade');
return;
}
} catch (err) {
rethrow(err, str, filename, parser.lexer.lineno);
}
}
/**
* Compile a `Function` representation of the given jade `str`.
*
* @param {String} str
* @param {Options} options
* @return {Function}
* @api public
*/
exports.compile = function(str, options){
var options = options || {}
, input = JSON.stringify(str)
, filename = options.filename
? JSON.stringify(options.filename)
: 'undefined';
// Reduce closure madness by injecting some locals
var fn = [
'var __ = { lineno: 1, input: ' + input + ', filename: ' + filename + ' };'
, rethrow.toString()
, 'try {'
, parse(String(str), options || {})
, '} catch (err) {'
, ' rethrow(err, __.input, __.filename, __.lineno);'
, '}'
].join('\n');
return new Function('locals', fn);
};
/**
* Render the given `str` of jade.
*
* Options:
*
* - `scope` Evaluation scope (`this`)
* - `locals` Local variable object
* - `filename` Used in exceptions, and required by `cache`
* - `cache` Cache intermediate JavaScript in memory keyed by `filename`
* - `compiler` Compiler to replade jade's default
* - `doctype` Specify the default doctype
*
* @param {String|Buffer} str
* @param {Object} options
* @return {String}
* @api public
*/
exports.render = function(str, options){
var fn
, options = options || {}
, filename = options.filename;
// Accept Buffers
str = String(str);
// Cache support
if (options.cache) {
if (filename) {
if (cache[filename]) {
fn = cache[filename];
} else {
fn = cache[filename] = new Function('locals', parse(str, options));
}
} else {
throw new Error('filename is required when using the cache option');
}
} else {
fn = new Function('locals', parse(str, options));
}
// Render the template
try {
var locals = options.locals || {}
, meta = { lineno: 1 };
locals.__ = meta;
return fn.call(options.scope, locals);
} catch (err) {
rethrow(err, str, filename, meta.lineno);
}
};
/**
* Render jade template at the given `path`.
*
* @param {String} path
* @param {Object} options
* @param {Function} fn
* @api public
*/
exports.renderFile = function(path, options, fn){
var ret;
if (typeof options === 'function') {
fn = options;
options = {};
}
options.filename = path;
// Primed cache
if (options.cache && cache[path]) {
try {
ret = exports.render('', options);
} catch (err) {
return fn(err);
}
fn(null, ret);
} else {
fs.readFile(path, 'utf8', function(err, str){
if (err) return fn(err);
try {
ret = exports.render(str, options);
} catch (err) {
return fn(err);
}
fn(null, ret);
});
}
};