367 lines
6.7 KiB
JavaScript
367 lines
6.7 KiB
JavaScript
|
|
/*!
|
|
* Stylus - RGBA
|
|
* Copyright (c) Automattic <developer.wordpress.com>
|
|
* MIT Licensed
|
|
*/
|
|
|
|
/**
|
|
* Module dependencies.
|
|
*/
|
|
|
|
var Node = require('./node')
|
|
, HSLA = require('./hsla')
|
|
, functions = require('../functions')
|
|
, adjust = functions.adjust
|
|
, nodes = require('./');
|
|
|
|
/**
|
|
* Initialize a new `RGBA` with the given r,g,b,a component values.
|
|
*
|
|
* @param {Number} r
|
|
* @param {Number} g
|
|
* @param {Number} b
|
|
* @param {Number} a
|
|
* @api public
|
|
*/
|
|
|
|
var RGBA = exports = module.exports = function RGBA(r,g,b,a){
|
|
Node.call(this);
|
|
this.r = clamp(r);
|
|
this.g = clamp(g);
|
|
this.b = clamp(b);
|
|
this.a = clampAlpha(a);
|
|
this.name = '';
|
|
this.rgba = this;
|
|
};
|
|
|
|
/**
|
|
* Inherit from `Node.prototype`.
|
|
*/
|
|
|
|
RGBA.prototype.__proto__ = Node.prototype;
|
|
|
|
/**
|
|
* Return an `RGBA` without clamping values.
|
|
*
|
|
* @param {Number} r
|
|
* @param {Number} g
|
|
* @param {Number} b
|
|
* @param {Number} a
|
|
* @return {RGBA}
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.withoutClamping = function(r,g,b,a){
|
|
var rgba = new RGBA(0,0,0,0);
|
|
rgba.r = r;
|
|
rgba.g = g;
|
|
rgba.b = b;
|
|
rgba.a = a;
|
|
return rgba;
|
|
};
|
|
|
|
/**
|
|
* Return a clone of this node.
|
|
*
|
|
* @return {Node}
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.prototype.clone = function(){
|
|
var clone = new RGBA(
|
|
this.r
|
|
, this.g
|
|
, this.b
|
|
, this.a);
|
|
clone.raw = this.raw;
|
|
clone.name = this.name;
|
|
clone.lineno = this.lineno;
|
|
clone.column = this.column;
|
|
clone.filename = this.filename;
|
|
return clone;
|
|
};
|
|
|
|
/**
|
|
* Return a JSON representation of this node.
|
|
*
|
|
* @return {Object}
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.prototype.toJSON = function(){
|
|
return {
|
|
__type: 'RGBA',
|
|
r: this.r,
|
|
g: this.g,
|
|
b: this.b,
|
|
a: this.a,
|
|
raw: this.raw,
|
|
name: this.name,
|
|
lineno: this.lineno,
|
|
column: this.column,
|
|
filename: this.filename
|
|
};
|
|
};
|
|
|
|
/**
|
|
* Return true.
|
|
*
|
|
* @return {Boolean}
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.prototype.toBoolean = function(){
|
|
return nodes.true;
|
|
};
|
|
|
|
/**
|
|
* Return `HSLA` representation.
|
|
*
|
|
* @return {HSLA}
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.prototype.__defineGetter__('hsla', function(){
|
|
return HSLA.fromRGBA(this);
|
|
});
|
|
|
|
/**
|
|
* Return hash.
|
|
*
|
|
* @return {String}
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.prototype.__defineGetter__('hash', function(){
|
|
return this.toString();
|
|
});
|
|
|
|
/**
|
|
* Add r,g,b,a to the current component values.
|
|
*
|
|
* @param {Number} r
|
|
* @param {Number} g
|
|
* @param {Number} b
|
|
* @param {Number} a
|
|
* @return {RGBA} new node
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.prototype.add = function(r,g,b,a){
|
|
return new RGBA(
|
|
this.r + r
|
|
, this.g + g
|
|
, this.b + b
|
|
, this.a + a);
|
|
};
|
|
|
|
/**
|
|
* Subtract r,g,b,a from the current component values.
|
|
*
|
|
* @param {Number} r
|
|
* @param {Number} g
|
|
* @param {Number} b
|
|
* @param {Number} a
|
|
* @return {RGBA} new node
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.prototype.sub = function(r,g,b,a){
|
|
return new RGBA(
|
|
this.r - r
|
|
, this.g - g
|
|
, this.b - b
|
|
, a == 1 ? this.a : this.a - a);
|
|
};
|
|
|
|
/**
|
|
* Multiply rgb components by `n`.
|
|
*
|
|
* @param {String} n
|
|
* @return {RGBA} new node
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.prototype.multiply = function(n){
|
|
return new RGBA(
|
|
this.r * n
|
|
, this.g * n
|
|
, this.b * n
|
|
, this.a);
|
|
};
|
|
|
|
/**
|
|
* Divide rgb components by `n`.
|
|
*
|
|
* @param {String} n
|
|
* @return {RGBA} new node
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.prototype.divide = function(n){
|
|
return new RGBA(
|
|
this.r / n
|
|
, this.g / n
|
|
, this.b / n
|
|
, this.a);
|
|
};
|
|
|
|
/**
|
|
* Operate on `right` with the given `op`.
|
|
*
|
|
* @param {String} op
|
|
* @param {Node} right
|
|
* @return {Node}
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.prototype.operate = function(op, right){
|
|
if ('in' != op) right = right.first
|
|
|
|
switch (op) {
|
|
case 'is a':
|
|
if ('string' == right.nodeName && 'color' == right.string) {
|
|
return nodes.true;
|
|
}
|
|
break;
|
|
case '+':
|
|
switch (right.nodeName) {
|
|
case 'unit':
|
|
var n = right.val;
|
|
switch (right.type) {
|
|
case '%': return adjust(this, new nodes.String('lightness'), right);
|
|
case 'deg': return this.hsla.adjustHue(n).rgba;
|
|
default: return this.add(n,n,n,0);
|
|
}
|
|
case 'rgba':
|
|
return this.add(right.r, right.g, right.b, right.a);
|
|
case 'hsla':
|
|
return this.hsla.add(right.h, right.s, right.l);
|
|
}
|
|
break;
|
|
case '-':
|
|
switch (right.nodeName) {
|
|
case 'unit':
|
|
var n = right.val;
|
|
switch (right.type) {
|
|
case '%': return adjust(this, new nodes.String('lightness'), new nodes.Unit(-n, '%'));
|
|
case 'deg': return this.hsla.adjustHue(-n).rgba;
|
|
default: return this.sub(n,n,n,0);
|
|
}
|
|
case 'rgba':
|
|
return this.sub(right.r, right.g, right.b, right.a);
|
|
case 'hsla':
|
|
return this.hsla.sub(right.h, right.s, right.l);
|
|
}
|
|
break;
|
|
case '*':
|
|
switch (right.nodeName) {
|
|
case 'unit':
|
|
return this.multiply(right.val);
|
|
}
|
|
break;
|
|
case '/':
|
|
switch (right.nodeName) {
|
|
case 'unit':
|
|
return this.divide(right.val);
|
|
}
|
|
break;
|
|
}
|
|
return Node.prototype.operate.call(this, op, right);
|
|
};
|
|
|
|
/**
|
|
* Return #nnnnnn, #nnn, or rgba(n,n,n,n) string representation of the color.
|
|
*
|
|
* @return {String}
|
|
* @api public
|
|
*/
|
|
|
|
RGBA.prototype.toString = function(){
|
|
function pad(n) {
|
|
return n < 16
|
|
? '0' + n.toString(16)
|
|
: n.toString(16);
|
|
}
|
|
|
|
// special case for transparent named color
|
|
if ('transparent' == this.name)
|
|
return this.name;
|
|
|
|
if (1 == this.a) {
|
|
var r = pad(this.r)
|
|
, g = pad(this.g)
|
|
, b = pad(this.b);
|
|
|
|
// Compress
|
|
if (r[0] == r[1] && g[0] == g[1] && b[0] == b[1]) {
|
|
return '#' + r[0] + g[0] + b[0];
|
|
} else {
|
|
return '#' + r + g + b;
|
|
}
|
|
} else {
|
|
return 'rgba('
|
|
+ this.r + ','
|
|
+ this.g + ','
|
|
+ this.b + ','
|
|
+ (+this.a.toFixed(3)) + ')';
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Return a `RGBA` from the given `hsla`.
|
|
*
|
|
* @param {HSLA} hsla
|
|
* @return {RGBA}
|
|
* @api public
|
|
*/
|
|
|
|
exports.fromHSLA = function(hsla){
|
|
var h = hsla.h / 360
|
|
, s = hsla.s / 100
|
|
, l = hsla.l / 100
|
|
, a = hsla.a;
|
|
|
|
var m2 = l <= .5 ? l * (s + 1) : l + s - l * s
|
|
, m1 = l * 2 - m2;
|
|
|
|
var r = hue(h + 1/3) * 0xff
|
|
, g = hue(h) * 0xff
|
|
, b = hue(h - 1/3) * 0xff;
|
|
|
|
function hue(h) {
|
|
if (h < 0) ++h;
|
|
if (h > 1) --h;
|
|
if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
|
|
if (h * 2 < 1) return m2;
|
|
if (h * 3 < 2) return m1 + (m2 - m1) * (2/3 - h) * 6;
|
|
return m1;
|
|
}
|
|
|
|
return new RGBA(r,g,b,a);
|
|
};
|
|
|
|
/**
|
|
* Clamp `n` >= 0 and <= 255.
|
|
*
|
|
* @param {Number} n
|
|
* @return {Number}
|
|
* @api private
|
|
*/
|
|
|
|
function clamp(n) {
|
|
return Math.max(0, Math.min(n.toFixed(0), 255));
|
|
}
|
|
|
|
/**
|
|
* Clamp alpha `n` >= 0 and <= 1.
|
|
*
|
|
* @param {Number} n
|
|
* @return {Number}
|
|
* @api private
|
|
*/
|
|
|
|
function clampAlpha(n) {
|
|
return Math.max(0, Math.min(n, 1));
|
|
}
|