forked from expressjs/express
/
utils.js
175 lines (149 loc) · 3.08 KB
/
utils.js
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/*!
* Express - utils
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var mime = require('mime');
/**
* Check if `path` looks absolute.
*
* @param {String} path
* @return {Boolean}
* @api private
*/
exports.isAbsolute = function(path){
if ('/' == path[0]) return true;
if (':' == path[1] && '\\' == path[2]) return true;
};
/**
* Flatten the given `arr`.
*
* @param {Array} arr
* @return {Array}
* @api private
*/
exports.flatten = function(arr, ret){
var ret = ret || []
, len = arr.length;
for (var i = 0; i < len; ++i) {
if (Array.isArray(arr[i])) {
exports.flatten(arr[i], ret);
} else {
ret.push(arr[i]);
}
}
return ret;
};
/**
* Check if `type` is acceptable based on
* the given `str`.
*
* @param {String} type
* @param {String} str
* @return {Boolean}
* @api private
*/
exports.accepts = function(type, str){
// accept anything when Accept is not present
if (!str) return true;
// resolve mime
if (!~type.indexOf('/')) type = mime.lookup(type);
// split type/subtype
type = type.split('/');
// parse
var accepted = exports.parseAccept(str)
, len = accepted.length
, obj
, ok;
for (var i = 0; i < len; ++i) {
obj = accepted[i];
if (exports.accept(type, obj)) return true;
}
return false;
};
/**
* Check if `type` array is acceptable for `other`.
*
* @param {Array} type
* @param {Object} other
* @return {Boolean}
* @api private
*/
exports.accept = function(type, other){
return (type[0] == other.type || '*' == other.type)
&& (type[1] == other.subtype || '*' == other.subtype);
};
/**
* Parse accept `str`, returning
* an array objects containing
* `.type` and `.subtype` along
* with the values provided by
* `parseQuality()`.
*
* @param {Type} name
* @return {Type}
* @api private
*/
exports.parseAccept = function(str){
return exports
.parseQuality(str)
.map(function(obj){
var parts = obj.value.split('/');
obj.type = parts[0];
obj.subtype = parts[1];
return obj;
});
};
/**
* Parse quality `str`, returning an
* array of objects with `.value` and
* `.quality`.
*
* @param {Type} name
* @return {Type}
* @api private
*/
exports.parseQuality = function(str){
return str
.split(/ *, */)
.map(quality)
.filter(function(obj){
return obj.quality;
})
.sort(function(a, b){
return b.quality - a.quality;
});
};
/**
* Parse quality `str` returning an
* object with `.value` and `.quality`.
*
* @param {String} str
* @return {Object}
* @api private
*/
function quality(str) {
var parts = str.split(/ *; */)
, val = parts[0];
var q = parts[1]
? parseFloat(parts[1].split(/ *= */)[1])
: 1;
return { value: val, quality: q };
}
/**
* Escape special characters in the given string of html.
*
* @param {String} html
* @return {String}
* @api private
*/
exports.escape = function(html) {
return String(html)
.replace(/&/g, '&')
.replace(/"/g, '"')
.replace(/</g, '<')
.replace(/>/g, '>');
};