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index.js
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index.js
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var postcss = require('postcss');
var functions = {
'darken': darkenColour,
'lighten': lightenColour,
'opacity': opacityColour
};
var colourCodes = {
'blue': '#F0F8FF',
'black': '#000',
'red': '#FF0000',
'orange': '#FFA500',
'yellow': '#FFFF00',
'white': '#FFF',
'green': '#008000',
'pink': '#FFC0CB',
'purple': '#800080',
'cyan': '#00FFFF',
'darkgrey': '#A9A9A9',
'darkgray': '#A9A9A9'
};
function hexToRgb(hex) {
var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
hex = hex.replace(shorthandRegex, function(m, r, g, b) {
return r + r + g + g + b + b;
});
var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
return result ? {
r: parseInt(result[1], 16),
g: parseInt(result[2], 16),
b: parseInt(result[3], 16)
} : null;
}
function stripRgb(rgb) {
var returnRgb = {
r: rgb[0].replace(/rgba*\(*/, ''),
g: rgb[1].replace(' ', ''),
b: rgb[2].replace(/[\s\)]/g, '')
}
if (rgb.length == 5){
returnRgb['a'] = rgb[3].replace(/\s/g, '');
}
return returnRgb;
}
function darkenColour(colour, amount) {
amount = amount.indexOf('%') != -1 ? parseFloat(amount.replace('%', '')) / 100 : parseFloat(amount);
var returnArr = [Math.round(parseFloat(colour['r']) * (1 - amount)),
Math.round(parseFloat(colour['g']) * (1 - amount)),
Math.round(parseFloat(colour['b']) * (1 - amount))];
if (colour.hasOwnProperty('a')) returnArr.push(parseFloat(colour['a']));
return returnArr;
}
function lightenColour(colour, amount) {
amount = amount.indexOf('%') != -1 ? parseFloat(amount.replace('%', '')) / 100 : parseFloat(amount);
var returnArr = [Math.round( parseFloat(colour['r']) + ( amount * (255 - parseFloat(colour['r'])) ) ),
Math.round( parseFloat(colour['g']) + ( amount * (255 - parseFloat(colour['g'])) ) ),
Math.round( parseFloat(colour['b']) + ( amount * (255 - parseFloat(colour['b'])) ) )];
if (colour.hasOwnProperty('a')) returnArr.push(parseFloat(colour['a']));
return returnArr;
}
function opacityColour(colour, amount) {
amount = amount.indexOf('%') != -1 ? parseFloat(amount.replace('%', '')) / 100 : parseFloat(amount);
return [colour['r'], colour['g'], colour['b'], amount];
}
module.exports = postcss.plugin('postcss-colour-functions', function myplugin(options) {
return function(css) {
options = options || {};
var requestedFunction = {},
colour,
amount,
newVal;
css.walkRules(function(rule) {
rule.walkDecls(function(decl, i) {
var val = decl.value;
for (var i in functions) {
if (val && val.indexOf(i) !== -1) {
var regex = new RegExp(i+"\\([a-zA-Z0-9\\)\\.\\#\\,\\s\\%]+");
var match = val.match(regex);
if (!match) continue;
requestedFunction = {
'function': i,
'request': val.match(regex)['input']
.replace(/\(/g, '')
.replace(/\)/g, '')
.replace(i, '')
.split(',')
};
if (requestedFunction['request'] !== undefined){
var possibleColour = requestedFunction['request'][0];
if (possibleColour.indexOf('#') != -1) {
colour = hexToRgb(possibleColour);
amount = requestedFunction['request'][1];
} else if (possibleColour.indexOf('rgb') != -1) {
colour = stripRgb(requestedFunction['request']);
amount = requestedFunction['request'][requestedFunction['request'].length - 1];
} else if (possibleColour.match(/[a-z]+/i) !== undefined){
if (colourCodes.hasOwnProperty(possibleColour)){
colour = hexToRgb(colourCodes[possibleColour]);
amount = requestedFunction['request'][1];
}else{
var errorMessage = 'POSTCSS-COLOUR-FUNCTIONS: No colour code found for ' + possibleColour +'. Are you trying to use a CSS colour code?';
throw new Error(errorMessage);
}
} else {
throw new Error('POSTCSS-COLOUR-FUNCTIONS: Colour entry must be in RGB or a hex code value');
}
if (functions[i] == opacityColour || colour.hasOwnProperty('a')){
newVal = 'rgba(' + functions[i](colour, amount).join(',') + ')';
}else{
newVal = 'rgb(' + functions[i](colour, amount).join(',') + ')';
}
decl.value = newVal;
requestedFunction = {};
}
break;
}
}
});
});
}
});