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/**
* Module dependencies.
*/
var pathRegexp = require('path-to-regexp');
var debug = require('debug')('express:router:layer');
/**
* Module variables.
*/
var hasOwnProperty = Object.prototype.hasOwnProperty;
/**
* Expose `Layer`.
*/
module.exports = Layer;
function Layer(path, options, fn) {
if (!(this instanceof Layer)) {
return new Layer(path, options, fn);
}
debug('new %s', path);
options = options || {};
this.handle = fn;
this.name = fn.name || '<anonymous>';
this.params = undefined;
this.path = undefined;
this.regexp = pathRegexp(path, this.keys = [], options);
if (path === '/' && options.end === false) {
this.regexp.fast_slash = true;
}
}
/**
* Handle the error for the layer.
*
* @param {Error} error
* @param {Request} req
* @param {Response} res
* @param {function} next
* @api private
*/
Layer.prototype.handle_error = function handle_error(error, req, res, next) {
var fn = this.handle;
if (fn.length !== 4) {
// not a standard error handler
return next(error);
}
try {
fn(error, req, res, next);
} catch (err) {
next(err);
}
};
/**
* Handle the request for the layer.
*
* @param {Request} req
* @param {Response} res
* @param {function} next
* @api private
*/
Layer.prototype.handle_request = function handle(req, res, next) {
var fn = this.handle;
if (fn.length > 3) {
// not a standard request handler
return next();
}
try {
fn(req, res, next);
} catch (err) {
next(err);
}
};
/**
* Check if this route matches `path`, if so
* populate `.params`.
*
* @param {String} path
* @return {Boolean}
* @api private
*/
Layer.prototype.match = function match(path) {
if (path == null) {
// no path, nothing matches
this.params = undefined;
this.path = undefined;
return false;
}
if (this.regexp.fast_slash) {
// fast path non-ending match for / (everything matches)
this.params = {};
this.path = '';
return true;
}
var m = this.regexp.exec(path);
if (!m) {
this.params = undefined;
this.path = undefined;
return false;
}
// store values
this.params = {};
this.path = m[0];
var keys = this.keys;
var params = this.params;
var prop;
var n = 0;
var key;
var val;
for (var i = 1, len = m.length; i < len; ++i) {
key = keys[i - 1];
prop = key
? key.name
: n++;
val = decode_param(m[i]);
if (val !== undefined || !(hasOwnProperty.call(params, prop))) {
params[prop] = val;
}
}
return true;
};
/**
* Decode param value.
*
* @param {string} val
* @return {string}
* @api private
*/
function decode_param(val){
if (typeof val !== 'string') {
return val;
}
try {
return decodeURIComponent(val);
} catch (e) {
var err = new TypeError("Failed to decode param '" + val + "'");
err.status = 400;
throw err;
}
}
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