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Edit File: regjsgen.js

/*!
 * RegJSGen
 * Copyright 2014 Benjamin Tan <https://d10.github.io/>
 * Available under MIT license <http://d10.mit-license.org/>
 */
;(function() {
  'use strict';

/** Used to determine if values are of the language type `Object` */
  var objectTypes = {
    'function': true,
    'object': true
  };

/** Used as a reference to the global object */
  var root = (objectTypes[typeof window] && window) || this;

/** Backup possible global object */
  var oldRoot = root;

/** Detect free variable `exports` */
  var freeExports = objectTypes[typeof exports] && exports;

/** Detect free variable `module` */
  var freeModule = objectTypes[typeof module] && module && !module.nodeType && module;

/** Detect free variable `global` from Node.js or Browserified code and use it as `root` */
  var freeGlobal = freeExports && freeModule && typeof global == 'object' && global;
  if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal || freeGlobal.self === freeGlobal)) {
    root = freeGlobal;
  }

/*--------------------------------------------------------------------------*/

/*! Based on https://mths.be/fromcodepoint v0.2.0 by @mathias */

function assertType(type, expected) {
    if (expected.indexOf('|') == -1) {
      if (type == expected) {
        return;
      }

throw Error('Invalid node type: ' + type);
    }

expected = assertType.hasOwnProperty(expected)
      ? assertType[expected]
      : (assertType[expected] = RegExp('^(?:' + expected + ')$'));

if (expected.test(type)) {
      return;
    }

throw Error('Invalid node type: ' + type);
  }

/*--------------------------------------------------------------------------*/

function generate(node) {
    var type = node.type;

if (generate.hasOwnProperty(type) && typeof generate[type] == 'function') {
      return generate[type](node);
    }

throw Error('Invalid node type: ' + type);
  }

/*--------------------------------------------------------------------------*/

function generateAlternative(node) {
    assertType(node.type, 'alternative');

var terms = node.body,
        length = terms ? terms.length : 0;

if (length == 1) {
      return generateTerm(terms[0]);
    } else {
      var i = -1,
          result = '';

while (++i < length) {
        result += generateTerm(terms[i]);
      }

return result;
    }
  }

function generateAnchor(node) {
    assertType(node.type, 'anchor');

switch (node.kind) {
      case 'start':
        return '^';
      case 'end':
        return '$';
      case 'boundary':
        return '\\b';
      case 'not-boundary':
        return '\\B';
      default:
        throw Error('Invalid assertion');
    }
  }

function generateAtom(node) {
    assertType(node.type, 'anchor|characterClass|characterClassEscape|dot|group|reference|value');

return generate(node);
  }

function generateCharacterClass(node) {
    assertType(node.type, 'characterClass');

var classRanges = node.body,
        length = classRanges ? classRanges.length : 0;

var i = -1,
        result = '[';

if (node.negative) {
      result += '^';
    }

while (++i < length) {
      result += generateClassAtom(classRanges[i]);
    }

result += ']';

return result;
  }

function generateCharacterClassEscape(node) {
    assertType(node.type, 'characterClassEscape');

return '\\' + node.value;
  }

function generateCharacterClassRange(node) {
    assertType(node.type, 'characterClassRange');

var min = node.min,
        max = node.max;

if (min.type == 'characterClassRange' || max.type == 'characterClassRange') {
      throw Error('Invalid character class range');
    }

return generateClassAtom(min) + '-' + generateClassAtom(max);
  }

function generateClassAtom(node) {
    assertType(node.type, 'anchor|characterClassEscape|characterClassRange|dot|value');

return generate(node);
  }

function generateDisjunction(node) {
    assertType(node.type, 'disjunction');

var body = node.body,
        length = body ? body.length : 0;

if (length == 0) {
      throw Error('No body');
    } else if (length == 1) {
      return generate(body[0]);
    } else {
      var i = -1,
          result = '';

while (++i < length) {
        if (i != 0) {
          result += '|';
        }
        result += generate(body[i]);
      }

return result;
    }
  }

function generateDot(node) {
    assertType(node.type, 'dot');

return '.';
  }

function generateGroup(node) {
    assertType(node.type, 'group');

var result = '(';

switch (node.behavior) {
      case 'normal':
        break;
      case 'ignore':
        result += '?:';
        break;
      case 'lookahead':
        result += '?=';
        break;
      case 'negativeLookahead':
        result += '?!';
        break;
      default:
        throw Error('Invalid behaviour: ' + node.behaviour);
    }

var body = node.body,
        length = body ? body.length : 0;

if (length == 1) {
      result += generate(body[0]);
    } else {
      var i = -1;

while (++i < length) {
        result += generate(body[i]);
      }
    }

result += ')';

return result;
  }

function generateQuantifier(node) {
    assertType(node.type, 'quantifier');

var quantifier = '',
        min = node.min,
        max = node.max;

switch (max) {
      case undefined:
      case null:
        switch (min) {
          case 0:
            quantifier = '*'
            break;
          case 1:
            quantifier = '+';
            break;
          default:
            quantifier = '{' + min + ',}';
            break;
        }
        break;
      default:
        if (min == max) {
          quantifier = '{' + min + '}';
        }
        else if (min == 0 && max == 1) {
          quantifier = '?';
        } else {
          quantifier = '{' + min + ',' + max + '}';
        }
        break;
    }

if (!node.greedy) {
      quantifier += '?';
    }

return generateAtom(node.body[0]) + quantifier;
  }

function generateReference(node) {
    assertType(node.type, 'reference');

return '\\' + node.matchIndex;
  }

function generateTerm(node) {
    assertType(node.type, 'anchor|characterClass|characterClassEscape|empty|group|quantifier|reference|value');

return generate(node);
  }

function generateValue(node) {
    assertType(node.type, 'value');

var kind = node.kind,
        codePoint = node.codePoint;

switch (kind) {
      case 'controlLetter':
        return '\\c' + fromCodePoint(codePoint + 64);
      case 'hexadecimalEscape':
        return '\\x' + ('00' + codePoint.toString(16).toUpperCase()).slice(-2);
      case 'identifier':
        return '\\' + fromCodePoint(codePoint);
      case 'null':
        return '\\' + codePoint;
      case 'octal':
        return '\\' + codePoint.toString(8);
      case 'singleEscape':
        switch (codePoint) {
          case 0x0008:
            return '\\b';
          case 0x009:
            return '\\t';
          case 0x00A:
            return '\\n';
          case 0x00B:
            return '\\v';
          case 0x00C:
            return '\\f';
          case 0x00D:
            return '\\r';
          default:
            throw Error('Invalid codepoint: ' + codePoint);
        }
      case 'symbol':
        return fromCodePoint(codePoint);
      case 'unicodeEscape':
        return '\\u' + ('0000' + codePoint.toString(16).toUpperCase()).slice(-4);
      case 'unicodeCodePointEscape':
        return '\\u{' + codePoint.toString(16).toUpperCase() + '}';
      default:
        throw Error('Unsupported node kind: ' + kind);
    }
  }

/*--------------------------------------------------------------------------*/

generate.alternative = generateAlternative;
  generate.anchor = generateAnchor;
  generate.characterClass = generateCharacterClass;
  generate.characterClassEscape = generateCharacterClassEscape;
  generate.characterClassRange = generateCharacterClassRange;
  generate.disjunction = generateDisjunction;
  generate.dot = generateDot;
  generate.group = generateGroup;
  generate.quantifier = generateQuantifier;
  generate.reference = generateReference;
  generate.value = generateValue;

/*--------------------------------------------------------------------------*/

// export regjsgen
  // some AMD build optimizers, like r.js, check for condition patterns like the following:
  if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
    // define as an anonymous module so, through path mapping, it can be aliased
    define(function() {
      return {
        'generate': generate
      };
    });
  }
  // check for `exports` after `define` in case a build optimizer adds an `exports` object
  else if (freeExports && freeModule) {
    // in Narwhal, Node.js, Rhino -require, or RingoJS
    freeExports.generate = generate;
  }
  // in a browser or Rhino
  else {
    root.regjsgen = {
      'generate': generate
    };
  }
}.call(this));

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