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Filename : parser.js
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// Copyright (c) 2014 Rafael Caricio. All rights reserved.
// Use of this source code is governed by (The MIT License).

var GradientParser = (GradientParser || {});

GradientParser.stringify = (function() {

  var visitor = {

    'visit_linear-gradient': function(node) {
      return visitor.visit_gradient(node);
    },

    'visit_repeating-linear-gradient': function(node) {
      return visitor.visit_gradient(node);
    },

    'visit_radial-gradient': function(node) {
      return visitor.visit_gradient(node);
    },

    'visit_repeating-radial-gradient': function(node) {
      return visitor.visit_gradient(node);
    },

    'visit_gradient': function(node) {
      var orientation = visitor.visit(node.orientation);
      if (orientation) {
        orientation += ', ';
      }

      return node.type + '(' + orientation + visitor.visit(node.colorStops) + ')';
    },

    'visit_shape': function(node) {
      var result = node.value,
          at = visitor.visit(node.at),
          style = visitor.visit(node.style);

      if (style) {
        result += ' ' + style;
      }

      if (at) {
        result += ' at ' + at;
      }

      return result;
    },

    'visit_default-radial': function(node) {
      var result = '',
          at = visitor.visit(node.at);

      if (at) {
        result += at;
      }
      return result;
    },

    'visit_extent-keyword': function(node) {
      var result = node.value,
          at = visitor.visit(node.at);

      if (at) {
        result += ' at ' + at;
      }

      return result;
    },

    'visit_position-keyword': function(node) {
      return node.value;
    },

    'visit_position': function(node) {
      return visitor.visit(node.value.x) + ' ' + visitor.visit(node.value.y);
    },

    'visit_%': function(node) {
      return node.value + '%';
    },

    'visit_em': function(node) {
      return node.value + 'em';
    },

    'visit_px': function(node) {
      return node.value + 'px';
    },

    'visit_literal': function(node) {
      return visitor.visit_color(node.value, node);
    },

    'visit_hex': function(node) {
      return visitor.visit_color('#' + node.value, node);
    },

    'visit_rgb': function(node) {
      return visitor.visit_color('rgb(' + node.value.join(', ') + ')', node);
    },

    'visit_rgba': function(node) {
      return visitor.visit_color('rgba(' + node.value.join(', ') + ')', node);
    },

    'visit_color': function(resultColor, node) {
      var result = resultColor,
          length = visitor.visit(node.length);

      if (length) {
        result += ' ' + length;
      }
      return result;
    },

    'visit_angular': function(node) {
      return node.value + 'deg';
    },

    'visit_directional': function(node) {
      return 'to ' + node.value;
    },

    'visit_array': function(elements) {
      var result = '',
          size = elements.length;

      elements.forEach(function(element, i) {
        result += visitor.visit(element);
        if (i < size - 1) {
          result += ', ';
        }
      });

      return result;
    },

    'visit': function(element) {
      if (!element) {
        return '';
      }
      var result = '';

      if (element instanceof Array) {
        return visitor.visit_array(element, result);
      } else if (element.type) {
        var nodeVisitor = visitor['visit_' + element.type];
        if (nodeVisitor) {
          return nodeVisitor(element);
        } else {
          throw Error('Missing visitor visit_' + element.type);
        }
      } else {
        throw Error('Invalid node.');
      }
    }

  };

  return function(root) {
    return visitor.visit(root);
  };
})();

// Copyright (c) 2014 Rafael Caricio. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

var GradientParser = (GradientParser || {});

GradientParser.parse = (function() {

  var tokens = {
    linearGradient: /^(\-(webkit|o|ms|moz)\-)?(linear\-gradient)/i,
    repeatingLinearGradient: /^(\-(webkit|o|ms|moz)\-)?(repeating\-linear\-gradient)/i,
    radialGradient: /^(\-(webkit|o|ms|moz)\-)?(radial\-gradient)/i,
    repeatingRadialGradient: /^(\-(webkit|o|ms|moz)\-)?(repeating\-radial\-gradient)/i,
    sideOrCorner: /^to (left (top|bottom)|right (top|bottom)|left|right|top|bottom)/i,
    extentKeywords: /^(closest\-side|closest\-corner|farthest\-side|farthest\-corner|contain|cover)/,
    positionKeywords: /^(left|center|right|top|bottom)/i,
    pixelValue: /^(-?(([0-9]*\.[0-9]+)|([0-9]+\.?)))px/,
    percentageValue: /^(-?(([0-9]*\.[0-9]+)|([0-9]+\.?)))\%/,
    emValue: /^(-?(([0-9]*\.[0-9]+)|([0-9]+\.?)))em/,
    angleValue: /^(-?(([0-9]*\.[0-9]+)|([0-9]+\.?)))deg/,
    startCall: /^\(/,
    endCall: /^\)/,
    comma: /^,/,
    hexColor: /^\#([0-9a-fA-F]+)/,
    literalColor: /^([a-zA-Z]+)/,
    rgbColor: /^rgb/i,
    rgbaColor: /^rgba/i,
	varColor: /^var/i,
    number: /^(([0-9]*\.[0-9]+)|([0-9]+\.?))/,
	variable: /var\(([a-zA-Z-0-9_#,\s]+)\)/
  };

  var input = '';

  function error(msg) {
    var err = new Error(input + ': ' + msg);
    err.source = input;
    throw err;
  }

  function getAST() {
    var ast = matchListDefinitions();

    if (input.length > 0) {
      error('Invalid input not EOF');
    }

    return ast;
  }

  function matchListDefinitions() {
    return matchListing(matchDefinition);
  }

  function matchDefinition() {
    return matchGradient(
            'linear-gradient',
            tokens.linearGradient,
            matchLinearOrientation) ||

          matchGradient(
            'repeating-linear-gradient',
            tokens.repeatingLinearGradient,
            matchLinearOrientation) ||

          matchGradient(
            'radial-gradient',
            tokens.radialGradient,
            matchListRadialOrientations) ||

          matchGradient(
            'repeating-radial-gradient',
            tokens.repeatingRadialGradient,
            matchListRadialOrientations);
  }

  function matchGradient(gradientType, pattern, orientationMatcher) {
    return matchCall(pattern, function(captures) {

      var orientation = orientationMatcher();
      if (orientation) {
        if (!scan(tokens.comma)) {
          error('Missing comma before color stops');
        }
      }

      return {
        type: gradientType,
        orientation: orientation,
        colorStops: matchListing(matchColorStop)
      };
    });
  }

  function matchCall(pattern, callback) {
    var captures = scan(pattern);

    if (captures) {
      if (!scan(tokens.startCall)) {
        error('Missing (');
      }

      var result = callback(captures);
      if (!scan(tokens.endCall)) {
        error('Missing )');
      }
      return result;
    }
  }

  function matchLinearOrientation() {
    return matchSideOrCorner() ||
      matchAngle();
  }

  function matchSideOrCorner() {
    return match('directional', tokens.sideOrCorner, 1);
  }

  function matchAngle() {
    return match('angular', tokens.angleValue, 1);
  }

  function matchListRadialOrientations() {
    var radialOrientations,
        radialOrientation = matchRadialOrientation(),
        lookaheadCache;
    if (radialOrientation) {
      radialOrientations = [];
      radialOrientations.push(radialOrientation);

      lookaheadCache = input;
      if (scan(tokens.comma)) {
        radialOrientation = matchRadialOrientation();
        if (radialOrientation) {
          radialOrientations.push(radialOrientation);
        } else {
          input = lookaheadCache;
        }
      }
    }

    return radialOrientations;
  }

  function matchRadialOrientation() {
    var radialType = matchCircle() ||
      matchEllipse();

    if (radialType) {
      radialType.at = matchAtPosition();
    } else {
      var extent = matchExtentKeyword();
      if (extent) {
        radialType = extent;
        var positionAt = matchAtPosition();
        if (positionAt) {
          radialType.at = positionAt;
        }
      } else {
        var defaultPosition = matchPositioning();
        if (defaultPosition) {
          radialType = {
            type: 'default-radial',
            at: defaultPosition
          };
        }
      }
    }

    return radialType;
  }

  function matchCircle() {
    var circle = match('shape', /^(circle)/i, 0);

    if (circle) {
      circle.style = matchLength() || matchExtentKeyword();
    }

    return circle;
  }

  function matchEllipse() {
    var ellipse = match('shape', /^(ellipse)/i, 0);

    if (ellipse) {
      ellipse.style =  matchDistance() || matchExtentKeyword();
    }

    return ellipse;
  }

  function matchExtentKeyword() {
    return match('extent-keyword', tokens.extentKeywords, 1);
  }

  function matchAtPosition() {
    if (match('position', /^at/, 0)) {
      var positioning = matchPositioning();

      if (!positioning) {
        error('Missing positioning value');
      }

      return positioning;
    }
  }

  function matchPositioning() {
    var location = matchCoordinates();

    if (location.x || location.y) {
      return {
        type: 'position',
        value: location
      };
    }
  }

  function matchCoordinates() {
    return {
      x: matchDistance(),
      y: matchDistance()
    };
  }

  function matchListing(matcher) {
    var captures = matcher(),
      result = [];

    if (captures) {
      result.push(captures);
      while (scan(tokens.comma)) {
        captures = matcher();
        if (captures) {
          result.push(captures);
        } else {
          error('One extra comma');
        }
      }
    }

    return result;
  }

  function matchColorStop() {
    var color = matchColor();

    if (!color) {
      error('Expected color definition');
    }

    color.length = matchDistance();
    return color;
  }

  function matchColor() {
    return matchHexColor() ||
      matchRGBAColor() ||
      matchRGBColor() ||
	  matchVARColor() ||
      matchLiteralColor();
  }

  function matchLiteralColor() {
    return match('literal', tokens.literalColor, 0);
  }

  function matchVARColor() {
    return match('literal', tokens.variable, 0);
  }

  function matchHexColor() {
    return match('hex', tokens.hexColor, 1);
  }

  function matchRGBColor() {
    return matchCall(tokens.rgbColor, function() {
      return  {
        type: 'rgb',
        value: matchListing(matchNumber)
      };
    });
  }

  function matchRGBAColor() {
    return matchCall(tokens.rgbaColor, function() {
      return  {
        type: 'rgba',
        value: matchListing(matchNumber)
      };
    });
  }
  function matchNumber() {
    return scan(tokens.number)[1];
  }

  function matchDistance() {
    return match('%', tokens.percentageValue, 1) ||
      matchPositionKeyword() ||
      matchLength();
  }

  function matchPositionKeyword() {
    return match('position-keyword', tokens.positionKeywords, 1);
  }

  function matchLength() {
    return match('px', tokens.pixelValue, 1) ||
      match('em', tokens.emValue, 1);
  }

  function match(type, pattern, captureIndex) {
    var captures = scan(pattern);
    if (captures) {
      return {
        type: type,
        value: captures[captureIndex]
      };
    }
  }

  function scan(regexp) {
    var captures,
        blankCaptures;

    blankCaptures = /^[\n\r\t\s]+/.exec(input);
    if (blankCaptures) {
        consume(blankCaptures[0].length);
    }
    captures = regexp.exec(input);
    if (captures) {
        consume(captures[0].length);
    }

    return captures;
  }

  function consume(size) {
    input = input.substr(size);
  }

  return function(code) {
    input = code.toString();
    return getAST();
  };
})();

exports.parse = GradientParser.parse;
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