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/*!
* Jade - runtime
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
/**
* Lame Array.isArray() polyfill for now.
*/
if (!Array.isArray) {
Array.isArray = function(arr){
return '[object Array]' == Object.prototype.toString.call(arr);
};
}
/**
* Lame Object.keys() polyfill for now.
*/
if (!Object.keys) {
Object.keys = function(obj){
var arr = [];
for (var key in obj) {
if (obj.hasOwnProperty(key)) {
arr.push(key);
}
}
return arr;
}
}
/**
* Merge two attribute objects giving precedence
* to values in object `b`. Classes are special-cased
* allowing for arrays and merging/joining appropriately
* resulting in a string.
*
* @param {Object} a
* @param {Object} b
* @return {Object} a
* @api private
*/
exports.merge = function merge(a, b) {
var ac = a['class'];
var bc = b['class'];
if (ac || bc) {
ac = ac || [];
bc = bc || [];
if (!Array.isArray(ac)) ac = [ac];
if (!Array.isArray(bc)) bc = [bc];
ac = ac.filter(nulls);
bc = bc.filter(nulls);
a['class'] = ac.concat(bc).join(' ');
}
for (var key in b) {
if (key != 'class') {
a[key] = b[key];
}
}
return a;
};
/**
* Filter null `val`s.
*
* @param {Mixed} val
* @return {Mixed}
* @api private
*/
function nulls(val) {
return val != null;
}
/**
* Render the given attributes object.
*
* @param {Object} obj
* @param {Object} escaped
* @return {String}
* @api private
*/
exports.attrs = function attrs(obj, escaped){
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 ('boolean' == typeof val || null == val) {
if (val) {
terse
? buf.push(key)
: buf.push(key + '="' + key + '"');
}
} else if (0 == key.indexOf('data') && 'string' != typeof val) {
buf.push(key + "='" + JSON.stringify(val) + "'");
} else if ('class' == key && Array.isArray(val)) {
buf.push(key + '="' + exports.escape(val.join(' ')) + '"');
} else if (escaped && escaped[key]) {
buf.push(key + '="' + exports.escape(val) + '"');
} else {
buf.push(key + '="' + val + '"');
}
}
}
return buf.join(' ');
};
/**
* Escape the given string of `html`.
*
* @param {String} html
* @return {String}
* @api private
*/
exports.escape = function escape(html){
return String(html)
.replace(/&(?!(\w+|\#\d+);)/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/"/g, '"');
};
/**
* Re-throw the given `err` in context to the
* the jade in `filename` at the given `lineno`.
*
* @param {Error} err
* @param {String} filename
* @param {String} lineno
* @api private
*/
exports.rethrow = function rethrow(err, filename, lineno){
if (!filename) throw err;
var context = 3
, str = require('fs').readFileSync(filename, 'utf8')
, 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;
};
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