CasperSecurity
var lexer = require('css-tree').lexer;
var packNumber = require('./Number').pack;
// http://www.w3.org/TR/css3-color/#svg-color
var NAME_TO_HEX = {
'aliceblue': 'f0f8ff',
'antiquewhite': 'faebd7',
'aqua': '0ff',
'aquamarine': '7fffd4',
'azure': 'f0ffff',
'beige': 'f5f5dc',
'bisque': 'ffe4c4',
'black': '000',
'blanchedalmond': 'ffebcd',
'blue': '00f',
'blueviolet': '8a2be2',
'brown': 'a52a2a',
'burlywood': 'deb887',
'cadetblue': '5f9ea0',
'chartreuse': '7fff00',
'chocolate': 'd2691e',
'coral': 'ff7f50',
'cornflowerblue': '6495ed',
'cornsilk': 'fff8dc',
'crimson': 'dc143c',
'cyan': '0ff',
'darkblue': '00008b',
'darkcyan': '008b8b',
'darkgoldenrod': 'b8860b',
'darkgray': 'a9a9a9',
'darkgrey': 'a9a9a9',
'darkgreen': '006400',
'darkkhaki': 'bdb76b',
'darkmagenta': '8b008b',
'darkolivegreen': '556b2f',
'darkorange': 'ff8c00',
'darkorchid': '9932cc',
'darkred': '8b0000',
'darksalmon': 'e9967a',
'darkseagreen': '8fbc8f',
'darkslateblue': '483d8b',
'darkslategray': '2f4f4f',
'darkslategrey': '2f4f4f',
'darkturquoise': '00ced1',
'darkviolet': '9400d3',
'deeppink': 'ff1493',
'deepskyblue': '00bfff',
'dimgray': '696969',
'dimgrey': '696969',
'dodgerblue': '1e90ff',
'firebrick': 'b22222',
'floralwhite': 'fffaf0',
'forestgreen': '228b22',
'fuchsia': 'f0f',
'gainsboro': 'dcdcdc',
'ghostwhite': 'f8f8ff',
'gold': 'ffd700',
'goldenrod': 'daa520',
'gray': '808080',
'grey': '808080',
'green': '008000',
'greenyellow': 'adff2f',
'honeydew': 'f0fff0',
'hotpink': 'ff69b4',
'indianred': 'cd5c5c',
'indigo': '4b0082',
'ivory': 'fffff0',
'khaki': 'f0e68c',
'lavender': 'e6e6fa',
'lavenderblush': 'fff0f5',
'lawngreen': '7cfc00',
'lemonchiffon': 'fffacd',
'lightblue': 'add8e6',
'lightcoral': 'f08080',
'lightcyan': 'e0ffff',
'lightgoldenrodyellow': 'fafad2',
'lightgray': 'd3d3d3',
'lightgrey': 'd3d3d3',
'lightgreen': '90ee90',
'lightpink': 'ffb6c1',
'lightsalmon': 'ffa07a',
'lightseagreen': '20b2aa',
'lightskyblue': '87cefa',
'lightslategray': '789',
'lightslategrey': '789',
'lightsteelblue': 'b0c4de',
'lightyellow': 'ffffe0',
'lime': '0f0',
'limegreen': '32cd32',
'linen': 'faf0e6',
'magenta': 'f0f',
'maroon': '800000',
'mediumaquamarine': '66cdaa',
'mediumblue': '0000cd',
'mediumorchid': 'ba55d3',
'mediumpurple': '9370db',
'mediumseagreen': '3cb371',
'mediumslateblue': '7b68ee',
'mediumspringgreen': '00fa9a',
'mediumturquoise': '48d1cc',
'mediumvioletred': 'c71585',
'midnightblue': '191970',
'mintcream': 'f5fffa',
'mistyrose': 'ffe4e1',
'moccasin': 'ffe4b5',
'navajowhite': 'ffdead',
'navy': '000080',
'oldlace': 'fdf5e6',
'olive': '808000',
'olivedrab': '6b8e23',
'orange': 'ffa500',
'orangered': 'ff4500',
'orchid': 'da70d6',
'palegoldenrod': 'eee8aa',
'palegreen': '98fb98',
'paleturquoise': 'afeeee',
'palevioletred': 'db7093',
'papayawhip': 'ffefd5',
'peachpuff': 'ffdab9',
'peru': 'cd853f',
'pink': 'ffc0cb',
'plum': 'dda0dd',
'powderblue': 'b0e0e6',
'purple': '800080',
'rebeccapurple': '639',
'red': 'f00',
'rosybrown': 'bc8f8f',
'royalblue': '4169e1',
'saddlebrown': '8b4513',
'salmon': 'fa8072',
'sandybrown': 'f4a460',
'seagreen': '2e8b57',
'seashell': 'fff5ee',
'sienna': 'a0522d',
'silver': 'c0c0c0',
'skyblue': '87ceeb',
'slateblue': '6a5acd',
'slategray': '708090',
'slategrey': '708090',
'snow': 'fffafa',
'springgreen': '00ff7f',
'steelblue': '4682b4',
'tan': 'd2b48c',
'teal': '008080',
'thistle': 'd8bfd8',
'tomato': 'ff6347',
'turquoise': '40e0d0',
'violet': 'ee82ee',
'wheat': 'f5deb3',
'white': 'fff',
'whitesmoke': 'f5f5f5',
'yellow': 'ff0',
'yellowgreen': '9acd32'
};
var HEX_TO_NAME = {
'800000': 'maroon',
'800080': 'purple',
'808000': 'olive',
'808080': 'gray',
'00ffff': 'cyan',
'f0ffff': 'azure',
'f5f5dc': 'beige',
'ffe4c4': 'bisque',
'000000': 'black',
'0000ff': 'blue',
'a52a2a': 'brown',
'ff7f50': 'coral',
'ffd700': 'gold',
'008000': 'green',
'4b0082': 'indigo',
'fffff0': 'ivory',
'f0e68c': 'khaki',
'00ff00': 'lime',
'faf0e6': 'linen',
'000080': 'navy',
'ffa500': 'orange',
'da70d6': 'orchid',
'cd853f': 'peru',
'ffc0cb': 'pink',
'dda0dd': 'plum',
'f00': 'red',
'ff0000': 'red',
'fa8072': 'salmon',
'a0522d': 'sienna',
'c0c0c0': 'silver',
'fffafa': 'snow',
'd2b48c': 'tan',
'008080': 'teal',
'ff6347': 'tomato',
'ee82ee': 'violet',
'f5deb3': 'wheat',
'ffffff': 'white',
'ffff00': 'yellow'
};
function hueToRgb(p, q, t) {
if (t < 0) {
t += 1;
}
if (t > 1) {
t -= 1;
}
if (t < 1 / 6) {
return p + (q - p) * 6 * t;
}
if (t < 1 / 2) {
return q;
}
if (t < 2 / 3) {
return p + (q - p) * (2 / 3 - t) * 6;
}
return p;
}
function hslToRgb(h, s, l, a) {
var r;
var g;
var b;
if (s === 0) {
r = g = b = l; // achromatic
} else {
var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
r = hueToRgb(p, q, h + 1 / 3);
g = hueToRgb(p, q, h);
b = hueToRgb(p, q, h - 1 / 3);
}
return [
Math.round(r * 255),
Math.round(g * 255),
Math.round(b * 255),
a
];
}
function toHex(value) {
value = value.toString(16);
return value.length === 1 ? '0' + value : value;
}
function parseFunctionArgs(functionArgs, count, rgb) {
var cursor = functionArgs.head;
var args = [];
var wasValue = false;
while (cursor !== null) {
var node = cursor.data;
var type = node.type;
switch (type) {
case 'Number':
case 'Percentage':
if (wasValue) {
return;
}
wasValue = true;
args.push({
type: type,
value: Number(node.value)
});
break;
case 'Operator':
if (node.value === ',') {
if (!wasValue) {
return;
}
wasValue = false;
} else if (wasValue || node.value !== '+') {
return;
}
break;
default:
// something we couldn't understand
return;
}
cursor = cursor.next;
}
if (args.length !== count) {
// invalid arguments count
// TODO: remove those tokens
return;
}
if (args.length === 4) {
if (args[3].type !== 'Number') {
// 4th argument should be a number
// TODO: remove those tokens
return;
}
args[3].type = 'Alpha';
}
if (rgb) {
if (args[0].type !== args[1].type || args[0].type !== args[2].type) {
// invalid color, numbers and percentage shouldn't be mixed
// TODO: remove those tokens
return;
}
} else {
if (args[0].type !== 'Number' ||
args[1].type !== 'Percentage' ||
args[2].type !== 'Percentage') {
// invalid color, for hsl values should be: number, percentage, percentage
// TODO: remove those tokens
return;
}
args[0].type = 'Angle';
}
return args.map(function(arg) {
var value = Math.max(0, arg.value);
switch (arg.type) {
case 'Number':
// fit value to [0..255] range
value = Math.min(value, 255);
break;
case 'Percentage':
// convert 0..100% to value in [0..255] range
value = Math.min(value, 100) / 100;
if (!rgb) {
return value;
}
value = 255 * value;
break;
case 'Angle':
// fit value to (-360..360) range
return (((value % 360) + 360) % 360) / 360;
case 'Alpha':
// fit value to [0..1] range
return Math.min(value, 1);
}
return Math.round(value);
});
}
function compressFunction(node, item, list) {
var functionName = node.name;
var args;
if (functionName === 'rgba' || functionName === 'hsla') {
args = parseFunctionArgs(node.children, 4, functionName === 'rgba');
if (!args) {
// something went wrong
return;
}
if (functionName === 'hsla') {
args = hslToRgb.apply(null, args);
node.name = 'rgba';
}
if (args[3] === 0) {
// try to replace `rgba(x, x, x, 0)` to `transparent`
// always replace `rgba(0, 0, 0, 0)` to `transparent`
// otherwise avoid replacement in gradients since it may break color transition
// http://stackoverflow.com/questions/11829410/css3-gradient-rendering-issues-from-transparent-to-white
var scopeFunctionName = this.function && this.function.name;
if ((args[0] === 0 && args[1] === 0 && args[2] === 0) ||
!/^(?:to|from|color-stop)$|gradient$/i.test(scopeFunctionName)) {
item.data = {
type: 'Identifier',
loc: node.loc,
name: 'transparent'
};
return;
}
}
if (args[3] !== 1) {
// replace argument values for normalized/interpolated
node.children.each(function(node, item, list) {
if (node.type === 'Operator') {
if (node.value !== ',') {
list.remove(item);
}
return;
}
item.data = {
type: 'Number',
loc: node.loc,
value: packNumber(args.shift(), null)
};
});
return;
}
// otherwise convert to rgb, i.e. rgba(255, 0, 0, 1) -> rgb(255, 0, 0)
functionName = 'rgb';
}
if (functionName === 'hsl') {
args = args || parseFunctionArgs(node.children, 3, false);
if (!args) {
// something went wrong
return;
}
// convert to rgb
args = hslToRgb.apply(null, args);
functionName = 'rgb';
}
if (functionName === 'rgb') {
args = args || parseFunctionArgs(node.children, 3, true);
if (!args) {
// something went wrong
return;
}
// check if color is not at the end and not followed by space
var next = item.next;
if (next && next.data.type !== 'WhiteSpace') {
list.insert(list.createItem({
type: 'WhiteSpace',
value: ' '
}), next);
}
item.data = {
type: 'Hash',
loc: node.loc,
value: toHex(args[0]) + toHex(args[1]) + toHex(args[2])
};
compressHex(item.data, item);
}
}
function compressIdent(node, item) {
if (this.declaration === null) {
return;
}
var color = node.name.toLowerCase();
if (NAME_TO_HEX.hasOwnProperty(color) &&
lexer.matchDeclaration(this.declaration).isType(node, 'color')) {
var hex = NAME_TO_HEX[color];
if (hex.length + 1 <= color.length) {
// replace for shorter hex value
item.data = {
type: 'Hash',
loc: node.loc,
value: hex
};
} else {
// special case for consistent colors
if (color === 'grey') {
color = 'gray';
}
// just replace value for lower cased name
node.name = color;
}
}
}
function compressHex(node, item) {
var color = node.value.toLowerCase();
// #112233 -> #123
if (color.length === 6 &&
color[0] === color[1] &&
color[2] === color[3] &&
color[4] === color[5]) {
color = color[0] + color[2] + color[4];
}
if (HEX_TO_NAME[color]) {
item.data = {
type: 'Identifier',
loc: node.loc,
name: HEX_TO_NAME[color]
};
} else {
node.value = color;
}
}
module.exports = {
compressFunction: compressFunction,
compressIdent: compressIdent,
compressHex: compressHex
};