100 lines
2.9 KiB
JavaScript
100 lines
2.9 KiB
JavaScript
if (typeof(require) !== 'undefined') { var tree = require('less/tree') }
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tree.functions = {
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rgb: function (r, g, b) {
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return this.rgba(r, g, b, 1.0);
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},
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rgba: function (r, g, b, a) {
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var rgb = [r, g, b].map(function (c) { return number(c) }),
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a = number(a);
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return new(tree.Color)(rgb, a);
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},
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hsl: function (h, s, l) {
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return this.hsla(h, s, l, 1.0);
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},
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hsla: function (h, s, l, a) {
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h = (((number(h) % 360) + 360) % 360) / 360;
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s = number(s); l = number(l); a = number(a);
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//require('sys').puts(h, s, l)
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var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
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var m1 = l * 2 - m2;
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return this.rgba(hue(h + 1/3) * 255,
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hue(h) * 255,
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hue(h - 1/3) * 255,
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a);
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function hue(h) {
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h = h < 0 ? h + 1 : (h > 1 ? h - 1 : h);
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if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
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else if (h * 2 < 1) return m2;
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else if (h * 3 < 2) return m1 + (m2 - m1) * (2/3 - h) * 6;
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else return m1;
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}
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},
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saturate: function (color, amount) {
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var hsl = color.toHSL();
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hsl.s += amount.value / 100;
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hsl.s = clamp(hsl.s);
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return this.hsl(hsl.h, hsl.s, hsl.l);
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},
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desaturate: function (color, amount) {
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var hsl = color.toHSL();
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hsl.s -= amount.value / 100;
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hsl.s = clamp(hsl.s);
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return this.hsl(hsl.h, hsl.s, hsl.l);
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},
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lighten: function (color, amount) {
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var hsl = color.toHSL();
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hsl.l *= (1 + amount.value / 100);
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hsl.l = clamp(hsl.l);
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return this.hsl(hsl.h, hsl.s, hsl.l);
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},
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darken: function (color, amount) {
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var hsl = color.toHSL();
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hsl.l *= (1 - amount.value / 100);
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hsl.l = clamp(hsl.l);
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return this.hsl(hsl.h, hsl.s, hsl.l);
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},
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greyscale: function (color, amount) {
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return this.desaturate(color, new(tree.Dimension)(100));
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},
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e: function (str) {
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return new(tree.Anonymous)(str);
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},
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'%': function (quoted /* arg, arg, ...*/) {
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var args = Array.prototype.slice.call(arguments, 1),
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str = quoted.content;
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for (var i = 0; i < args.length; i++) {
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str = str.replace(/%s/, args[i].content)
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.replace(/%[da]/, args[i].toCSS());
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}
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str = str.replace(/%%/g, '%');
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return new(tree.Quoted)('"' + str + '"', str);
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}
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};
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function number(n) {
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if (n instanceof tree.Dimension) {
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return parseFloat(n.unit == '%' ? n.value / 100 : n.value);
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} else if (typeof(n) === 'number') {
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return n;
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} else {
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throw {
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error: "RuntimeError",
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message: "color functions take numbers as parameters"
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};
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}
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}
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function clamp(val) {
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return Math.min(1, Math.max(0, val));
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}
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