url-pattern.js

// Generated by CoffeeScript 1.10.0
var slice = [].slice;

(function(root, factory) {
  if (('function' === typeof define) && (define.amd != null)) {
    return define([], factory);
  } else if (typeof exports !== "undefined" && exports !== null) {
    return module.exports = factory();
  } else {
    return root.UrlPattern = factory();
  }
})(this, function() {
  var P, UrlPattern, astNodeContainsSegmentsForProvidedParams, astNodeToNames, astNodeToRegexString, baseAstNodeToRegexString, concatMap, defaultOptions, escapeForRegex, getParam, keysAndValuesToObject, newParser, regexGroupCount, stringConcatMap, stringify;
  escapeForRegex = function(string) {
    return string.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
  };
  concatMap = function(array, f) {
    var i, length, results;
    results = [];
    i = -1;
    length = array.length;
    while (++i < length) {
      results = results.concat(f(array[i]));
    }
    return results;
  };
  stringConcatMap = function(array, f) {
    var i, length, result;
    result = '';
    i = -1;
    length = array.length;
    while (++i < length) {
      result += f(array[i]);
    }
    return result;
  };
  regexGroupCount = function(regex) {
    return (new RegExp(regex.toString() + '|')).exec('').length - 1;
  };
  keysAndValuesToObject = function(keys, values) {
    var i, key, length, object, value;
    object = {};
    i = -1;
    length = keys.length;
    while (++i < length) {
      key = keys[i];
      value = values[i];
      if (value == null) {
        continue;
      }
      if (object[key] != null) {
        if (!Array.isArray(object[key])) {
          object[key] = [object[key]];
        }
        object[key].push(value);
      } else {
        object[key] = value;
      }
    }
    return object;
  };
  P = {};
  P.Result = function(value, rest) {
    this.value = value;
    this.rest = rest;
  };
  P.Tagged = function(tag, value) {
    this.tag = tag;
    this.value = value;
  };
  P.tag = function(tag, parser) {
    return function(input) {
      var result, tagged;
      result = parser(input);
      if (result == null) {
        return;
      }
      tagged = new P.Tagged(tag, result.value);
      return new P.Result(tagged, result.rest);
    };
  };
  P.regex = function(regex) {
    return function(input) {
      var matches, result;
      matches = regex.exec(input);
      if (matches == null) {
        return;
      }
      result = matches[0];
      return new P.Result(result, input.slice(result.length));
    };
  };
  P.sequence = function() {
    var parsers;
    parsers = 1 <= arguments.length ? slice.call(arguments, 0) : [];
    return function(input) {
      var i, length, parser, rest, result, values;
      i = -1;
      length = parsers.length;
      values = [];
      rest = input;
      while (++i < length) {
        parser = parsers[i];
        result = parser(rest);
        if (result == null) {
          return;
        }
        values.push(result.value);
        rest = result.rest;
      }
      return new P.Result(values, rest);
    };
  };
  P.pick = function() {
    var indexes, parsers;
    indexes = arguments[0], parsers = 2 <= arguments.length ? slice.call(arguments, 1) : [];
    return function(input) {
      var array, result;
      result = P.sequence.apply(P, parsers)(input);
      if (result == null) {
        return;
      }
      array = result.value;
      result.value = array[indexes];
      return result;
    };
  };
  P.string = function(string) {
    var length;
    length = string.length;
    return function(input) {
      if (input.slice(0, length) === string) {
        return new P.Result(string, input.slice(length));
      }
    };
  };
  P.lazy = function(fn) {
    var cached;
    cached = null;
    return function(input) {
      if (cached == null) {
        cached = fn();
      }
      return cached(input);
    };
  };
  P.baseMany = function(parser, end, stringResult, atLeastOneResultRequired, input) {
    var endResult, parserResult, rest, results;
    rest = input;
    results = stringResult ? '' : [];
    while (true) {
      if (end != null) {
        endResult = end(rest);
        if (endResult != null) {
          break;
        }
      }
      parserResult = parser(rest);
      if (parserResult == null) {
        break;
      }
      if (stringResult) {
        results += parserResult.value;
      } else {
        results.push(parserResult.value);
      }
      rest = parserResult.rest;
    }
    if (atLeastOneResultRequired && results.length === 0) {
      return;
    }
    return new P.Result(results, rest);
  };
  P.many1 = function(parser) {
    return function(input) {
      return P.baseMany(parser, null, false, true, input);
    };
  };
  P.concatMany1Till = function(parser, end) {
    return function(input) {
      return P.baseMany(parser, end, true, true, input);
    };
  };
  P.firstChoice = function() {
    var parsers;
    parsers = 1 <= arguments.length ? slice.call(arguments, 0) : [];
    return function(input) {
      var i, length, parser, result;
      i = -1;
      length = parsers.length;
      while (++i < length) {
        parser = parsers[i];
        result = parser(input);
        if (result != null) {
          return result;
        }
      }
    };
  };
  newParser = function(options) {
    var U;
    U = {};
    U.wildcard = P.tag('wildcard', P.string(options.wildcardChar));
    U.optional = P.tag('optional', P.pick(1, P.string(options.optionalSegmentStartChar), P.lazy(function() {
      return U.pattern;
    }), P.string(options.optionalSegmentEndChar)));
    U.name = P.regex(new RegExp("^[" + options.segmentNameCharset + "]+"));
    U.namedWildcard = P.tag('namedWildcard', P.pick(2, P.string(options.wildcardChar), P.string(options.segmentNameStartChar), P.lazy(function() {
      return U.name;
    })));
    U.named = P.tag('named', P.pick(1, P.string(options.segmentNameStartChar), P.lazy(function() {
      return U.name;
    })));
    U.escapedChar = P.pick(1, P.string(options.escapeChar), P.regex(/^./));
    U["static"] = P.tag('static', P.concatMany1Till(P.firstChoice(P.lazy(function() {
      return U.escapedChar;
    }), P.regex(/^./)), P.firstChoice(P.string(options.segmentNameStartChar), P.string(options.optionalSegmentStartChar), P.string(options.optionalSegmentEndChar), U.wildcard)));
    U.token = P.lazy(function() {
      return P.firstChoice(U.namedWildcard, U.wildcard, U.optional, U.named, U["static"]);
    });
    U.pattern = P.many1(P.lazy(function() {
      return U.token;
    }));
    return U;
  };
  defaultOptions = {
    escapeChar: '\\',
    segmentNameStartChar: ':',
    segmentValueCharset: 'a-zA-Z0-9-_~ %',
    segmentNameCharset: 'a-zA-Z0-9',
    optionalSegmentStartChar: '(',
    optionalSegmentEndChar: ')',
    wildcardChar: '*'
  };
  baseAstNodeToRegexString = function(astNode, segmentValueCharset) {
    if (Array.isArray(astNode)) {
      return stringConcatMap(astNode, function(node) {
        return baseAstNodeToRegexString(node, segmentValueCharset);
      });
    }
    switch (astNode.tag) {
      case 'wildcard':
      case 'namedWildcard':
        return '(.*?)';
      case 'named':
        return "([" + segmentValueCharset + "]+)";
      case 'static':
        return escapeForRegex(astNode.value);
      case 'optional':
        return '(?:' + baseAstNodeToRegexString(astNode.value, segmentValueCharset) + ')?';
    }
  };
  astNodeToRegexString = function(astNode, segmentValueCharset) {
    if (segmentValueCharset == null) {
      segmentValueCharset = defaultOptions.segmentValueCharset;
    }
    return '^' + baseAstNodeToRegexString(astNode, segmentValueCharset) + '$';
  };
  astNodeToNames = function(astNode) {
    if (Array.isArray(astNode)) {
      return concatMap(astNode, astNodeToNames);
    }
    switch (astNode.tag) {
      case 'wildcard':
        return ['_'];
      case 'namedWildcard':
      case 'named':
        return [astNode.value];
      case 'static':
        return [];
      case 'optional':
        return astNodeToNames(astNode.value);
    }
  };
  getParam = function(params, key, nextIndexes, sideEffects) {
    var index, maxIndex, result, value;
    if (sideEffects == null) {
      sideEffects = false;
    }
    value = params[key];
    if (value == null) {
      if (sideEffects) {
        throw new Error("no values provided for key `" + key + "`");
      } else {
        return;
      }
    }
    index = nextIndexes[key] || 0;
    maxIndex = Array.isArray(value) ? value.length - 1 : 0;
    if (index > maxIndex) {
      if (sideEffects) {
        throw new Error("too few values provided for key `" + key + "`");
      } else {
        return;
      }
    }
    result = Array.isArray(value) ? value[index] : value;
    if (sideEffects) {
      nextIndexes[key] = index + 1;
    }
    return result;
  };
  astNodeContainsSegmentsForProvidedParams = function(astNode, params, nextIndexes) {
    var i, length;
    if (Array.isArray(astNode)) {
      i = -1;
      length = astNode.length;
      while (++i < length) {
        if (astNodeContainsSegmentsForProvidedParams(astNode[i], params, nextIndexes)) {
          return true;
        }
      }
      return false;
    }
    switch (astNode.tag) {
      case 'wildcard':
        return getParam(params, '_', nextIndexes, false) != null;
      case 'named':
        return getParam(params, astNode.value, nextIndexes, false) != null;
      case 'static':
        return false;
      case 'optional':
        return astNodeContainsSegmentsForProvidedParams(astNode.value, params, nextIndexes);
    }
  };
  stringify = function(astNode, params, nextIndexes) {
    if (Array.isArray(astNode)) {
      return stringConcatMap(astNode, function(node) {
        return stringify(node, params, nextIndexes);
      });
    }
    switch (astNode.tag) {
      case 'wildcard':
        return getParam(params, '_', nextIndexes, true);
      case 'named':
      case 'namedWildcard':
        return getParam(params, astNode.value, nextIndexes, true);
      case 'static':
        return astNode.value;
      case 'optional':
        if (astNodeContainsSegmentsForProvidedParams(astNode.value, params, nextIndexes)) {
          return stringify(astNode.value, params, nextIndexes);
        } else {
          return '';
        }
    }
  };
  UrlPattern = function(arg1, arg2) {
    var groupCount, options, parsed, parser, withoutWhitespace;
    if (arg1 instanceof UrlPattern) {
      this.isRegex = arg1.isRegex;
      this.regex = arg1.regex;
      this.ast = arg1.ast;
      this.names = arg1.names;
      return;
    }
    this.isRegex = arg1 instanceof RegExp;
    if (!(('string' === typeof arg1) || this.isRegex)) {
      throw new TypeError('argument must be a regex or a string');
    }
    if (this.isRegex) {
      this.regex = arg1;
      if (arg2 != null) {
        if (!Array.isArray(arg2)) {
          throw new Error('if first argument is a regex the second argument may be an array of group names but you provided something else');
        }
        groupCount = regexGroupCount(this.regex);
        if (arg2.length !== groupCount) {
          throw new Error("regex contains " + groupCount + " groups but array of group names contains " + arg2.length);
        }
        this.names = arg2;
      }
      return;
    }
    if (arg1 === '') {
      throw new Error('argument must not be the empty string');
    }
    withoutWhitespace = arg1.replace(/\s+/g, '');
    if (withoutWhitespace !== arg1) {
      throw new Error('argument must not contain whitespace');
    }
    options = {
      escapeChar: (arg2 != null ? arg2.escapeChar : void 0) || defaultOptions.escapeChar,
      segmentNameStartChar: (arg2 != null ? arg2.segmentNameStartChar : void 0) || defaultOptions.segmentNameStartChar,
      segmentNameCharset: (arg2 != null ? arg2.segmentNameCharset : void 0) || defaultOptions.segmentNameCharset,
      segmentValueCharset: (arg2 != null ? arg2.segmentValueCharset : void 0) || defaultOptions.segmentValueCharset,
      optionalSegmentStartChar: (arg2 != null ? arg2.optionalSegmentStartChar : void 0) || defaultOptions.optionalSegmentStartChar,
      optionalSegmentEndChar: (arg2 != null ? arg2.optionalSegmentEndChar : void 0) || defaultOptions.optionalSegmentEndChar,
      wildcardChar: (arg2 != null ? arg2.wildcardChar : void 0) || defaultOptions.wildcardChar
    };
    parser = newParser(options);
    parsed = parser.pattern(arg1);
    if (parsed == null) {
      throw new Error("couldn't parse pattern");
    }
    if (parsed.rest !== '') {
      throw new Error("could only partially parse pattern");
    }
    this.ast = parsed.value;
    this.regex = new RegExp(astNodeToRegexString(this.ast, options.segmentValueCharset));
    this.names = astNodeToNames(this.ast);
  };
  UrlPattern.prototype.match = function(url) {
    var groups, match;
    match = this.regex.exec(url);
    if (match == null) {
      return null;
    }
    groups = match.slice(1);
    if (this.names) {
      return keysAndValuesToObject(this.names, groups);
    } else {
      return groups;
    }
  };
  UrlPattern.prototype.stringify = function(params) {
    if (params == null) {
      params = {};
    }
    if (this.isRegex) {
      throw new Error("can't stringify patterns generated from a regex");
    }
    if (params !== Object(params)) {
      throw new Error("argument must be an object or undefined");
    }
    return stringify(this.ast, params, {});
  };
  UrlPattern.escapeForRegex = escapeForRegex;
  UrlPattern.concatMap = concatMap;
  UrlPattern.stringConcatMap = stringConcatMap;
  UrlPattern.regexGroupCount = regexGroupCount;
  UrlPattern.keysAndValuesToObject = keysAndValuesToObject;
  UrlPattern.P = P;
  UrlPattern.newParser = newParser;
  UrlPattern.defaultOptions = defaultOptions;
  UrlPattern.astNodeToRegexString = astNodeToRegexString;
  UrlPattern.astNodeToNames = astNodeToNames;
  UrlPattern.getParam = getParam;
  UrlPattern.astNodeContainsSegmentsForProvidedParams = astNodeContainsSegmentsForProvidedParams;
  UrlPattern.stringify = stringify;
  return UrlPattern;
});