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Directory :  /var/www/html/app6/node_modules/express/lib/router/

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Current File : /var/www/html/app6/node_modules/express/lib/router/layer.js
/*!
 * express
 * Copyright(c) 2009-2013 TJ Holowaychuk
 * Copyright(c) 2013 Roman Shtylman
 * Copyright(c) 2014-2015 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict';

/**
 * Module dependencies.
 * @private
 */

var pathRegexp = require('path-to-regexp');
var debug = require('debug')('express:router:layer');

/**
 * Module variables.
 * @private
 */

var hasOwnProperty = Object.prototype.hasOwnProperty;

/**
 * Module exports.
 * @public
 */

module.exports = Layer;

function Layer(path, options, fn) {
  if (!(this instanceof Layer)) {
    return new Layer(path, options, fn);
  }

  debug('new %o', path)
  var opts = options || {};

  this.handle = fn;
  this.name = fn.name || '<anonymous>';
  this.params = undefined;
  this.path = undefined;
  this.regexp = pathRegexp(path, this.keys = [], opts);

  // set fast path flags
  this.regexp.fast_star = path === '*'
  this.regexp.fast_slash = path === '/' && opts.end === false
}

/**
 * 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) {
  var match

  if (path != null) {
    // fast path non-ending match for / (any path matches)
    if (this.regexp.fast_slash) {
      this.params = {}
      this.path = ''
      return true
    }

    // fast path for * (everything matched in a param)
    if (this.regexp.fast_star) {
      this.params = {'0': decode_param(path)}
      this.path = path
      return true
    }

    // match the path
    match = this.regexp.exec(path)
  }

  if (!match) {
    this.params = undefined;
    this.path = undefined;
    return false;
  }

  // store values
  this.params = {};
  this.path = match[0]

  var keys = this.keys;
  var params = this.params;

  for (var i = 1; i < match.length; i++) {
    var key = keys[i - 1];
    var prop = key.name;
    var val = decode_param(match[i])

    if (val !== undefined || !(hasOwnProperty.call(params, prop))) {
      params[prop] = val;
    }
  }

  return true;
};

/**
 * Decode param value.
 *
 * @param {string} val
 * @return {string}
 * @private
 */

function decode_param(val) {
  if (typeof val !== 'string' || val.length === 0) {
    return val;
  }

  try {
    return decodeURIComponent(val);
  } catch (err) {
    if (err instanceof URIError) {
      err.message = 'Failed to decode param \'' + val + '\'';
      err.status = err.statusCode = 400;
    }

    throw err;
  }
}

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