Code coverage report for src/index.js

Statements: 85.96% (202 / 235)      Branches: 72.32% (81 / 112)      Functions: 95.83% (23 / 24)      Lines: 87.22% (198 / 227)      Ignored: none     

All files » src/ » index.js
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System.register(['core-js', './state', './segments'], function (_export) {
  'use strict';
 
  var core, State, StaticSegment, DynamicSegment, StarSegment, EpsilonSegment, RouteRecognizer, RecognizeResults;
 
  function _classCallCheck(instance, Constructor) { Iif (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }
 
  function parse(route, names, types) {
    // normalize route as not starting with a '/'. Recognition will
    // also normalize.
    Iif (route.charAt(0) === '/') {
      route = route.substr(1);
    }
 
    var results = [];
 
    for (var _iterator3 = route.split('/'), _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : _iterator3[Symbol.iterator]();;) {
      var _ref3;
 
      Eif (_isArray3) {
        if (_i3 >= _iterator3.length) break;
        _ref3 = _iterator3[_i3++];
      } else {
        _i3 = _iterator3.next();
        if (_i3.done) break;
        _ref3 = _i3.value;
      }
 
      var segment = _ref3;
 
      var match = undefined;
 
      if (match = segment.match(/^:([^\/]+)$/)) {
        results.push(new DynamicSegment(match[1]));
        names.push(match[1]);
        types.dynamics++;
      } else if (match = segment.match(/^\*([^\/]+)$/)) {
        results.push(new StarSegment(match[1]));
        names.push(match[1]);
        types.stars++;
      } else if (segment === '') {
        results.push(new EpsilonSegment());
      } else {
        results.push(new StaticSegment(segment));
        types.statics++;
      }
    }
 
    return results;
  }
 
  // This is a somewhat naive strategy, but should work in a lot of cases
  // A better strategy would properly resolve /posts/:id/new and /posts/edit/:id.
  //
  // This strategy generally prefers more static and less dynamic matching.
  // Specifically, it
  //
  //  * prefers fewer stars to more, then
  //  * prefers using stars for less of the match to more, then
  //  * prefers fewer dynamic segments to more, then
  //  * prefers more static segments to more
  function sortSolutions(states) {
    return states.sort(function (a, b) {
      if (a.types.stars !== b.types.stars) {
        return a.types.stars - b.types.stars;
      }
 
      if (a.types.stars) {
        if (a.types.statics !== b.types.statics) {
          return b.types.statics - a.types.statics;
        }
        if (a.types.dynamics !== b.types.dynamics) {
          return b.types.dynamics - a.types.dynamics;
        }
      }
 
      if (a.types.dynamics !== b.types.dynamics) {
        return a.types.dynamics - b.types.dynamics;
      }
 
      if (a.types.statics !== b.types.statics) {
        return b.types.statics - a.types.statics;
      }
 
      return 0;
    });
  }
 
  function recognizeChar(states, ch) {
    var nextStates = [];
 
    for (var i = 0, l = states.length; i < l; i++) {
      var state = states[i];
 
      nextStates = nextStates.concat(state.match(ch));
    }
 
    return nextStates;
  }
 
  function findHandler(state, path, queryParams) {
    var handlers = state.handlers,
        regex = state.regex;
    var captures = path.match(regex),
        currentCapture = 1;
    var result = new RecognizeResults(queryParams);
 
    for (var i = 0, l = handlers.length; i < l; i++) {
      var handler = handlers[i],
          names = handler.names,
          params = {};
 
      for (var j = 0, m = names.length; j < m; j++) {
        params[names[j]] = captures[currentCapture++];
      }
 
      result.push({ handler: handler.handler, params: params, isDynamic: !!names.length });
    }
 
    return result;
  }
 
  function addSegment(currentState, segment) {
    segment.eachChar(function (ch) {
      currentState = currentState.put(ch);
    });
 
    return currentState;
  }
  return {
    setters: [function (_coreJs) {
      core = _coreJs['default'];
    }, function (_state) {
      State = _state.State;
    }, function (_segments) {
      StaticSegment = _segments.StaticSegment;
      DynamicSegment = _segments.DynamicSegment;
      StarSegment = _segments.StarSegment;
      EpsilonSegment = _segments.EpsilonSegment;
    }],
    execute: function () {
 
      /**
       * Class that parses route patterns and matches path strings.
       * 
       * @class RouteRecognizer
       * @constructor
       */
 
      RouteRecognizer = (function () {
        function RouteRecognizer() {
          _classCallCheck(this, RouteRecognizer);
 
          this.rootState = new State();
          this.names = {};
        }
 
        /**
         * Parse a route pattern and add it to the collection of recognized routes.
         * 
         * @method add
         * @param {Object} route The route to add.
         */
 
        RouteRecognizer.prototype.add = function add(route) {
          if (Array.isArray(route)) {
            for (var _iterator = route, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
              var _ref;
 
              Eif (_isArray) {
                if (_i >= _iterator.length) break;
                _ref = _iterator[_i++];
              } else {
                _i = _iterator.next();
                if (_i.done) break;
                _ref = _i.value;
              }
 
              var r = _ref;
 
              this.add(r);
            }
 
            return;
          }
 
          var currentState = this.rootState,
              regex = '^',
              types = { statics: 0, dynamics: 0, stars: 0 },
              names = [],
              routeName = route.handler.name,
              isEmpty = true;
 
          var segments = parse(route.path, names, types);
          for (var _iterator2 = segments, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
            var _ref2;
 
            Eif (_isArray2) {
              if (_i2 >= _iterator2.length) break;
              _ref2 = _iterator2[_i2++];
            } else {
              _i2 = _iterator2.next();
              if (_i2.done) break;
              _ref2 = _i2.value;
            }
 
            var segment = _ref2;
 
            if (segment instanceof EpsilonSegment) {
              continue;
            }
 
            isEmpty = false;
 
            // Add a '/' for the new segment
            currentState = currentState.put({ validChars: '/' });
            regex += '/';
 
            // Add a representation of the segment to the NFA and regex
            currentState = addSegment(currentState, segment);
            regex += segment.regex();
          }
 
          if (isEmpty) {
            currentState = currentState.put({ validChars: '/' });
            regex += '/';
          }
 
          var handlers = [{ handler: route.handler, names: names }];
 
          if (routeName) {
            this.names[routeName] = {
              segments: segments,
              handlers: handlers
            };
          }
 
          currentState.handlers = handlers;
          currentState.regex = new RegExp(regex + '$');
          currentState.types = types;
 
          return currentState;
        };
 
        /**
         * Retrieve the handlers registered for the named route.
         * 
         * @method handlersFor
         * @param {String} name The name of the route.
         * @return {Array} The handlers.
         */
 
        RouteRecognizer.prototype.handlersFor = function handlersFor(name) {
          var route = this.names[name],
              result = [];
 
          if (!route) {
            throw new Error('There is no route named ' + name);
          }
 
          for (var i = 0, l = route.handlers.length; i < l; i++) {
            result.push(route.handlers[i]);
          }
 
          return result;
        };
 
        /**
         * Check if this RouteRecognizer recognizes a named route.
         * 
         * @method hasRoute
         * @param {String} name The name of the route.
         * @return {Boolean} True if the named route is recognized.
         */
 
        RouteRecognizer.prototype.hasRoute = function hasRoute(name) {
          return !!this.names[name];
        };
 
        /**
         * Generate a path and query string from a route name and params object.
         * 
         * @method generate
         * @param {String} name The name of the route.
         * @param {Object} params The route params to use when populating the pattern.
         *  Properties not required by the pattern will be appended to the query string.
         * @return {String} The generated absolute path and query string.
         */
 
        RouteRecognizer.prototype.generate = function generate(name, params) {
          params = Object.assign({}, params);
 
          var route = this.names[name],
              consumed = {},
              output = '';
 
          if (!route) {
            throw new Error('There is no route named ' + name);
          }
 
          var segments = route.segments;
 
          for (var i = 0, l = segments.length; i < l; i++) {
            var segment = segments[i];
 
            if (segment instanceof EpsilonSegment) {
              continue;
            }
 
            output += '/';
            var segmentValue = segment.generate(params, consumed);
            if (segmentValue === null || segmentValue === undefined) {
              throw new Error('A value is required for route parameter \'' + segment.name + '\' in route \'' + name + '\'.');
            }
 
            output += segmentValue;
          }
 
          if (output.charAt(0) !== '/') {
            output = '/' + output;
          }
 
          // remove params used in the path and add the rest to the querystring
          for (var param in consumed) {
            delete params[param];
          }
 
          output += this.generateQueryString(params);
 
          return output;
        };
 
        /**
         * Generate a query string from an object.
         * 
         * @method generateQueryString
         * @param {Object} params Object containing the keys and values to be used.
         * @return {String} The generated query string, including leading '?'.
         */
 
        RouteRecognizer.prototype.generateQueryString = function generateQueryString(params) {
          var pairs = [],
              keys = [],
              encode = encodeURIComponent,
              encodeKey = function encodeKey(k) {
            return encode(k).replace('%24', '$');
          };
 
          for (var key in params) {
            Eif (params.hasOwnProperty(key)) {
              keys.push(key);
            }
          }
 
          keys.sort();
          for (var i = 0, len = keys.length; i < len; i++) {
            key = keys[i];
            var value = params[key];
            if (value === null || value === undefined) {
              continue;
            }
 
            if (Array.isArray(value)) {
              var arrayKey = '' + encodeKey(key) + '[]';
              for (var j = 0, l = value.length; j < l; j++) {
                pairs.push('' + arrayKey + '=' + encode(value[j]));
              }
            } else {
              pairs.push('' + encodeKey(key) + '=' + encode(value));
            }
          }
 
          if (pairs.length === 0) {
            return '';
          }
 
          return '?' + pairs.join('&');
        };
 
        /**
         * Parse a query string.
         * 
         * @method parseQueryString
         * @param {String} The query string to parse.
         * @return {Object} Object with keys and values mapped from the query string.
         */
 
        RouteRecognizer.prototype.parseQueryString = function parseQueryString(queryString) {
          var queryParams = {};
          if (!queryString || typeof queryString !== 'string') {
            return queryParams;
          }
 
          if (queryString.charAt(0) === '?') {
            queryString = queryString.substr(1);
          }
 
          var pairs = queryString.split('&');
          for (var i = 0; i < pairs.length; i++) {
            var pair = pairs[i].split('='),
                key = decodeURIComponent(pair[0]),
                keyLength = key.length,
                isArray = false,
                value;
 
            if (!key) {
              continue;
            } else if (pair.length === 1) {
              value = true;
            } else {
              //Handle arrays
              if (keyLength > 2 && key.slice(keyLength - 2) === '[]') {
                isArray = true;
                key = key.slice(0, keyLength - 2);
                if (!queryParams[key]) {
                  queryParams[key] = [];
                }
              }
              value = pair[1] ? decodeURIComponent(pair[1]) : '';
            }
            if (isArray) {
              queryParams[key].push(value);
            } else {
              queryParams[key] = value;
            }
          }
          return queryParams;
        };
 
        /**
         * Match a path string against registered route patterns.
         * 
         * @method recognize
         * @param {String} path The path to attempt to match.
         * @return {Array} Array of objects containing `handler`, `params`, and
         *  `isDynanic` values for the matched route(s), or undefined if no match
         *  was found.
         */
 
        RouteRecognizer.prototype.recognize = function recognize(path) {
          var states = [this.rootState],
              pathLen,
              i,
              l,
              queryStart,
              queryParams = {},
              isSlashDropped = false;
 
          queryStart = path.indexOf('?');
          Iif (queryStart !== -1) {
            var queryString = path.substr(queryStart + 1, path.length);
            path = path.substr(0, queryStart);
            queryParams = this.parseQueryString(queryString);
          }
 
          path = decodeURI(path);
 
          Iif (path.charAt(0) !== '/') {
            path = '/' + path;
          }
 
          pathLen = path.length;
          Iif (pathLen > 1 && path.charAt(pathLen - 1) === '/') {
            path = path.substr(0, pathLen - 1);
            isSlashDropped = true;
          }
 
          for (i = 0, l = path.length; i < l; i++) {
            states = recognizeChar(states, path.charAt(i));
            if (!states.length) {
              break;
            }
          }
 
          var solutions = [];
          for (i = 0, l = states.length; i < l; i++) {
            Eif (states[i].handlers) {
              solutions.push(states[i]);
            }
          }
 
          states = sortSolutions(solutions);
 
          var state = solutions[0];
          if (state && state.handlers) {
            // if a trailing slash was dropped and a star segment is the last segment
            // specified, put the trailing slash back
            Iif (isSlashDropped && state.regex.source.slice(-5) === '(.+)$') {
              path = path + '/';
            }
            return findHandler(state, path, queryParams);
          }
        };
 
        return RouteRecognizer;
      })();
 
      _export('RouteRecognizer', RouteRecognizer);
 
      RecognizeResults = function RecognizeResults(queryParams) {
        _classCallCheck(this, RecognizeResults);
 
        this.splice = Array.prototype.splice;
        this.slice = Array.prototype.slice;
        this.push = Array.prototype.push;
        this.length = 0;
        this.queryParams = queryParams || {};
      };
    }
  };
});
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Durandal Project/aurelia/route-recognizer/src/index.js","sourcesContent":["import core from 'core-js';\nimport {State} from './state';\nimport {\n  StaticSegment,\n  DynamicSegment,\n  StarSegment,\n  EpsilonSegment\n} from './segments';\n\n/**\n * Class that parses route patterns and matches path strings.\n * \n * @class RouteRecognizer\n * @constructor\n */\nexport class RouteRecognizer {\n  constructor() {\n    this.rootState = new State();\n    this.names = {};\n  }\n\n  /**\n   * Parse a route pattern and add it to the collection of recognized routes.\n   * \n   * @method add\n   * @param {Object} route The route to add.\n   */\n  add(route) {\n    if (Array.isArray(route)) {\n      for (let r of route) {\n        this.add(r);\n      }\n\n      return;\n    }\n\n    var currentState = this.rootState, regex = '^',\n        types = { statics: 0, dynamics: 0, stars: 0 },\n        names = [], routeName = route.handler.name,\n        isEmpty = true;\n\n    var segments = parse(route.path, names, types);\n    for (let segment of segments) {\n      if (segment instanceof EpsilonSegment) {\n        continue;\n      }\n\n      isEmpty = false;\n\n      // Add a '/' for the new segment\n      currentState = currentState.put({ validChars: '/' });\n      regex += '/';\n\n      // Add a representation of the segment to the NFA and regex\n      currentState = addSegment(currentState, segment);\n      regex += segment.regex();\n    }\n\n    if (isEmpty) {\n      currentState = currentState.put({ validChars: '/' });\n      regex += '/';\n    }\n\n    var handlers = [{ handler: route.handler, names: names }];\n\n    if (routeName) {\n      this.names[routeName] = {\n        segments: segments,\n        handlers: handlers\n      };\n    }\n\n    currentState.handlers = handlers;\n    currentState.regex = new RegExp(regex + '$');\n    currentState.types = types;\n\n    return currentState;\n  }\n\n  /**\n   * Retrieve the handlers registered for the named route.\n   * \n   * @method handlersFor\n   * @param {String} name The name of the route.\n   * @return {Array} The handlers.\n   */\n  handlersFor(name) {\n    var route = this.names[name],\n        result = [];\n\n    if (!route) {\n      throw new Error(`There is no route named ${name}`);\n    }\n\n    for (var i=0, l=route.handlers.length; i<l; i++) {\n      result.push(route.handlers[i]);\n    }\n\n    return result;\n  }\n\n  /**\n   * Check if this RouteRecognizer recognizes a named route.\n   * \n   * @method hasRoute\n   * @param {String} name The name of the route.\n   * @return {Boolean} True if the named route is recognized.\n   */\n  hasRoute(name) {\n    return !!this.names[name];\n  }\n\n  /**\n   * Generate a path and query string from a route name and params object.\n   * \n   * @method generate\n   * @param {String} name The name of the route.\n   * @param {Object} params The route params to use when populating the pattern.\n   *  Properties not required by the pattern will be appended to the query string.\n   * @return {String} The generated absolute path and query string.\n   */\n  generate(name, params) {\n    params = Object.assign({}, params);\n\n    var route = this.names[name],\n        consumed = {}, output = '';\n\n    if (!route) {\n      throw new Error(`There is no route named ${name}`);\n    }\n\n    var segments = route.segments;\n\n    for (var i = 0, l = segments.length; i < l; i++) {\n      var segment = segments[i];\n\n      if (segment instanceof EpsilonSegment) {\n        continue;\n      }\n\n      output += '/';\n      var segmentValue = segment.generate(params, consumed);\n      if (segmentValue === null || segmentValue === undefined) {\n        throw new Error(`A value is required for route parameter '${segment.name}' in route '${name}'.`);\n      }\n\n      output += segmentValue;\n    }\n\n    if (output.charAt(0) !== '/') {\n      output = '/' + output;\n    }\n\n    // remove params used in the path and add the rest to the querystring\n    for (var param in consumed) {\n      delete params[param];\n    }\n\n    output += this.generateQueryString(params);\n\n    return output;\n  }\n\n  /**\n   * Generate a query string from an object.\n   * \n   * @method generateQueryString\n   * @param {Object} params Object containing the keys and values to be used.\n   * @return {String} The generated query string, including leading '?'.\n   */\n  generateQueryString(params) {\n    var pairs = [], keys = [], encode = encodeURIComponent,\n      encodeKey = k => encode(k).replace('%24', '$');\n\n    for (var key in params) {\n      if (params.hasOwnProperty(key)) {\n        keys.push(key);\n      }\n    }\n\n    keys.sort();\n    for (var i = 0, len = keys.length; i < len; i++) {\n      key = keys[i];\n      var value = params[key];\n      if (value === null || value === undefined) {\n        continue;\n      }\n\n      if (Array.isArray(value)) {\n        var arrayKey = `${encodeKey(key)}[]`;\n        for (var j = 0, l = value.length; j < l; j++) {\n          pairs.push(`${arrayKey}=${encode(value[j])}`);\n        }\n      } else {\n        pairs.push(`${encodeKey(key)}=${encode(value)}`);\n      }\n    }\n\n    if (pairs.length === 0) {\n      return '';\n    }\n\n    return '?' + pairs.join('&');\n  }\n\n  /**\n   * Parse a query string.\n   * \n   * @method parseQueryString\n   * @param {String} The query string to parse.\n   * @return {Object} Object with keys and values mapped from the query string.\n   */\n  parseQueryString(queryString) {\n    var queryParams = {};\n    if (!queryString || typeof queryString !== 'string') {\n      return queryParams;\n    }\n\n    if (queryString.charAt(0) === '?') {\n      queryString = queryString.substr(1);\n    }\n\n    var pairs = queryString.split('&');\n    for(var i = 0; i < pairs.length; i++) {\n      var pair = pairs[i].split('='),\n          key = decodeURIComponent(pair[0]),\n          keyLength = key.length,\n          isArray = false,\n          value;\n\n      if (!key) {\n        continue;\n      } else if (pair.length === 1) {\n        value = true;\n      } else {\n        //Handle arrays\n        if (keyLength > 2 && key.slice(keyLength -2) === '[]') {\n          isArray = true;\n          key = key.slice(0, keyLength - 2);\n          if(!queryParams[key]) {\n            queryParams[key] = [];\n          }\n        }\n        value = pair[1] ? decodeURIComponent(pair[1]) : '';\n      }\n      if (isArray) {\n        queryParams[key].push(value);\n      } else {\n        queryParams[key] = value;\n      }\n    }\n    return queryParams;\n  }\n\n  /**\n   * Match a path string against registered route patterns.\n   * \n   * @method recognize\n   * @param {String} path The path to attempt to match.\n   * @return {Array} Array of objects containing `handler`, `params`, and\n   *  `isDynanic` values for the matched route(s), or undefined if no match\n   *  was found.\n   */\n  recognize(path) {\n    var states = [ this.rootState ],\n        pathLen, i, l, queryStart, queryParams = {},\n        isSlashDropped = false;\n\n    queryStart = path.indexOf('?');\n    if (queryStart !== -1) {\n      var queryString = path.substr(queryStart + 1, path.length);\n      path = path.substr(0, queryStart);\n      queryParams = this.parseQueryString(queryString);\n    }\n\n    path = decodeURI(path);\n\n    if (path.charAt(0) !== '/') {\n      path = '/' + path;\n    }\n\n    pathLen = path.length;\n    if (pathLen > 1 && path.charAt(pathLen - 1) === '/') {\n      path = path.substr(0, pathLen - 1);\n      isSlashDropped = true;\n    }\n\n    for (i = 0, l = path.length; i < l; i++) {\n      states = recognizeChar(states, path.charAt(i));\n      if (!states.length) {\n        break;\n      }\n    }\n\n    var solutions = [];\n    for (i=0, l=states.length; i<l; i++) {\n      if (states[i].handlers) {\n        solutions.push(states[i]);\n      }\n    }\n\n    states = sortSolutions(solutions);\n\n    var state = solutions[0];\n    if (state && state.handlers) {\n      // if a trailing slash was dropped and a star segment is the last segment\n      // specified, put the trailing slash back\n      if (isSlashDropped && state.regex.source.slice(-5) === '(.+)$') {\n        path = path + '/';\n      }\n      return findHandler(state, path, queryParams);\n    }\n  }\n}\n\nclass RecognizeResults {\n  constructor(queryParams) {\n    this.splice = Array.prototype.splice;\n    this.slice = Array.prototype.slice;\n    this.push = Array.prototype.push;\n    this.length = 0;\n    this.queryParams = queryParams || {};\n  }\n}\n\nfunction parse(route, names, types) {\n  // normalize route as not starting with a '/'. Recognition will\n  // also normalize.\n  if (route.charAt(0) === '/') {\n    route = route.substr(1);\n  }\n\n  var results = [];\n\n  for (let segment of route.split('/')) {\n    let match;\n\n    if (match = segment.match(/^:([^\\/]+)$/)) {\n      results.push(new DynamicSegment(match[1]));\n      names.push(match[1]);\n      types.dynamics++;\n    } else if (match = segment.match(/^\\*([^\\/]+)$/)) {\n      results.push(new StarSegment(match[1]));\n      names.push(match[1]);\n      types.stars++;\n    } else if(segment === '') {\n      results.push(new EpsilonSegment());\n    } else {\n      results.push(new StaticSegment(segment));\n      types.statics++;\n    }\n  }\n\n  return results;\n}\n\n// This is a somewhat naive strategy, but should work in a lot of cases\n// A better strategy would properly resolve /posts/:id/new and /posts/edit/:id.\n//\n// This strategy generally prefers more static and less dynamic matching.\n// Specifically, it\n//\n//  * prefers fewer stars to more, then\n//  * prefers using stars for less of the match to more, then\n//  * prefers fewer dynamic segments to more, then\n//  * prefers more static segments to more\nfunction sortSolutions(states) {\n  return states.sort((a, b) => {\n    if (a.types.stars !== b.types.stars) {\n      return a.types.stars - b.types.stars;\n    }\n\n    if (a.types.stars) {\n      if (a.types.statics !== b.types.statics) {\n        return b.types.statics - a.types.statics;\n      }\n      if (a.types.dynamics !== b.types.dynamics) {\n        return b.types.dynamics - a.types.dynamics;\n      }\n    }\n\n    if (a.types.dynamics !== b.types.dynamics) {\n      return a.types.dynamics - b.types.dynamics;\n    }\n\n    if (a.types.statics !== b.types.statics) {\n      return b.types.statics - a.types.statics;\n    }\n\n    return 0;\n  });\n}\n\nfunction recognizeChar(states, ch) {\n  var nextStates = [];\n\n  for (var i = 0, l = states.length; i < l; i++) {\n    var state = states[i];\n\n    nextStates = nextStates.concat(state.match(ch));\n  }\n\n  return nextStates;\n}\n\nfunction findHandler(state, path, queryParams) {\n  var handlers = state.handlers, regex = state.regex;\n  var captures = path.match(regex), currentCapture = 1;\n  var result = new RecognizeResults(queryParams);\n\n  for (var i = 0, l = handlers.length; i < l; i++) {\n    var handler = handlers[i], names = handler.names, params = {};\n\n    for (var j = 0, m = names.length; j < m; j++) {\n      params[names[j]] = captures[currentCapture++];\n    }\n\n    result.push({ handler: handler.handler, params: params, isDynamic: !!names.length });\n  }\n\n  return result;\n}\n\nfunction addSegment(currentState, segment) {\n  segment.eachChar(ch => {\n    currentState = currentState.put(ch);\n  });\n\n  return currentState;\n}\n"]}