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helpers.js
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helpers.js
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// Express - Helpers - Copyright TJ Holowaychuk <tj@vision-media.ca> (MIT Licensed)
/**
* JSON aliases.
*/
JSON.encode = JSON.stringify
JSON.decode = JSON.parse
/**
* Return the directory name of the given _path_.
*
* @param {string} path
* @return {string}
* @api public
*/
exports.dirname = function(path) {
return path.split('/').slice(0, -1).join('/')
}
/**
* Return the extension name of the given _path_,
* or null when not present.
*
* @param {string} path
* @return {string}
* @api public
*/
exports.extname = function(path) {
if (path.lastIndexOf('.') < 0) return
return path.slice(path.lastIndexOf('.') + 1)
}
/**
* Return the basename of the given _path_.
*
* @param {string} path
* @return {string}
* @api public
*/
exports.basename = function(path) {
return path.split('/').slice(-1)[0]
}
/**
* Escape special characters in _html_.
*
* @param {string} html
* @return {string}
* @api public
*/
exports.escape = function(html) {
return html.toString()
.replace(/&/g, '&')
.replace(/"/g, '"')
.replace(/</g, '<')
.replace(/>/g, '>')
}
/**
* Convert native array-like objects into an
* array with optional _offset_.
*
* @param {object} arr
* @param {int} offset
* @return {array}
* @api public
*/
exports.toArray = function(arr, offset) {
return Array.prototype.slice.call(arr, offset)
}
/**
* Escape RegExp _chars_ in _string_. Where _chars_
* defaults to regular expression special characters.
*
* _chars_ should be a space delimited list of characters,
* for example '[ ] ( )'.
*
* @param {string} string
* @param {string} chars
* @return {Type}
* @api public
*/
exports.escapeRegexp = function(string, chars) {
var specials = (chars || '/ . * + ? | ( ) [ ] { } \\').split(' ').join('|\\')
return string.replace(new RegExp('(\\' + specials + ')', 'g'), '\\$1')
}
/**
* Decode values in _params_.
*
* @param {hash} params
* @see parseNestedParams()
* @api private
*/
function decode(params) {
for (var key in params)
params[key] = decodeURIComponent(params[key]).replace(/\+/g, ' ')
}
/**
* Parse nested _params_.
*
* @param {hash} params
* @return {hash}
* @see parseParams()
* @api public
*/
exports.parseNestedParams = function(params) {
var parts, key
decode(params)
for (key in params)
if (parts = key.split('['))
if (parts.length > 1)
for (var i = 0, prop = params, len = parts.length; i < len; ++i) {
var name = parts[i].replace(']', '')
if (i == len - 1)
prop[name] = params[key],
prop = params,
delete params[key]
else
prop = prop[name] = prop[name] || {}
}
return params
}
/**
* Parse params _str_ into a nested hash.
*
* @param {string} str
* @return {hash}
* @api public
*/
exports.parseParams = function(str) {
if (typeof str !== 'string') return
return exports.parseNestedParams($(str.split('&')).reduce({}, function(params, pair){
pair = pair.split('=')
params[pair[0]] = pair[1]
return params
}))
}