mirror of
https://github.com/less/less.js.git
synced 2026-01-22 21:58:14 -05:00
466 lines
16 KiB
JavaScript
466 lines
16 KiB
JavaScript
(function (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 scaled(c, 256); });
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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;
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s = number(s); l = number(l); a = number(a);
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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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hsv: function(h, s, v) {
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return this.hsva(h, s, v, 1.0);
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},
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hsva: function(h, s, v, a) {
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h = ((number(h) % 360) / 360) * 360;
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s = number(s); v = number(v); a = number(a);
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var i, f;
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i = Math.floor((h / 60) % 6);
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f = (h / 60) - i;
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var vs = [v,
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v * (1 - s),
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v * (1 - f * s),
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v * (1 - (1 - f) * s)];
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var perm = [[0, 3, 1],
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[2, 0, 1],
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[1, 0, 3],
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[1, 2, 0],
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[3, 1, 0],
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[0, 1, 2]];
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return this.rgba(vs[perm[i][0]] * 255,
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vs[perm[i][1]] * 255,
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vs[perm[i][2]] * 255,
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a);
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},
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hue: function (color) {
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return new(tree.Dimension)(Math.round(color.toHSL().h));
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},
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saturation: function (color) {
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return new(tree.Dimension)(Math.round(color.toHSL().s * 100), '%');
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},
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lightness: function (color) {
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return new(tree.Dimension)(Math.round(color.toHSL().l * 100), '%');
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},
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hsvhue: function(color) {
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return new(tree.Dimension)(Math.round(color.toHSV().h));
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},
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hsvsaturation: function (color) {
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return new(tree.Dimension)(Math.round(color.toHSV().s * 100), '%');
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},
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hsvvalue: function (color) {
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return new(tree.Dimension)(Math.round(color.toHSV().v * 100), '%');
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},
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red: function (color) {
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return new(tree.Dimension)(color.rgb[0]);
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},
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green: function (color) {
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return new(tree.Dimension)(color.rgb[1]);
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},
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blue: function (color) {
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return new(tree.Dimension)(color.rgb[2]);
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},
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alpha: function (color) {
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return new(tree.Dimension)(color.toHSL().a);
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},
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luma: function (color) {
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return new(tree.Dimension)(Math.round(color.luma() * color.alpha * 100), '%');
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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 hsla(hsl);
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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 hsla(hsl);
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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 += amount.value / 100;
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hsl.l = clamp(hsl.l);
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return hsla(hsl);
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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 -= amount.value / 100;
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hsl.l = clamp(hsl.l);
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return hsla(hsl);
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},
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fadein: function (color, amount) {
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var hsl = color.toHSL();
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hsl.a += amount.value / 100;
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hsl.a = clamp(hsl.a);
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return hsla(hsl);
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},
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fadeout: function (color, amount) {
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var hsl = color.toHSL();
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hsl.a -= amount.value / 100;
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hsl.a = clamp(hsl.a);
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return hsla(hsl);
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},
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fade: function (color, amount) {
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var hsl = color.toHSL();
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hsl.a = amount.value / 100;
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hsl.a = clamp(hsl.a);
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return hsla(hsl);
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},
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spin: function (color, amount) {
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var hsl = color.toHSL();
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var hue = (hsl.h + amount.value) % 360;
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hsl.h = hue < 0 ? 360 + hue : hue;
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return hsla(hsl);
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},
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//
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// Copyright (c) 2006-2009 Hampton Catlin, Nathan Weizenbaum, and Chris Eppstein
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// http://sass-lang.com
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//
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mix: function (color1, color2, weight) {
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if (!weight) {
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weight = new(tree.Dimension)(50);
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}
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var p = weight.value / 100.0;
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var w = p * 2 - 1;
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var a = color1.toHSL().a - color2.toHSL().a;
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var w1 = (((w * a == -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
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var w2 = 1 - w1;
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var rgb = [color1.rgb[0] * w1 + color2.rgb[0] * w2,
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color1.rgb[1] * w1 + color2.rgb[1] * w2,
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color1.rgb[2] * w1 + color2.rgb[2] * w2];
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var alpha = color1.alpha * p + color2.alpha * (1 - p);
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return new(tree.Color)(rgb, alpha);
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},
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greyscale: function (color) {
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return this.desaturate(color, new(tree.Dimension)(100));
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},
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contrast: function (color, dark, light, threshold) {
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// filter: contrast(3.2);
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// should be kept as is, so check for color
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if (!color.rgb) {
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return null;
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}
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if (typeof light === 'undefined') {
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light = this.rgba(255, 255, 255, 1.0);
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}
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if (typeof dark === 'undefined') {
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dark = this.rgba(0, 0, 0, 1.0);
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}
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//Figure out which is actually light and dark!
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if (dark.luma() > light.luma()) {
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var t = light;
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light = dark;
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dark = t;
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}
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if (typeof threshold === 'undefined') {
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threshold = 0.43;
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} else {
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threshold = number(threshold);
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}
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if ((color.luma() * color.alpha) < threshold) {
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return light;
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} else {
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return dark;
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}
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},
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e: function (str) {
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return new(tree.Anonymous)(str instanceof tree.JavaScript ? str.evaluated : str);
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},
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escape: function (str) {
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return new(tree.Anonymous)(encodeURI(str.value).replace(/=/g, "%3D").replace(/:/g, "%3A").replace(/#/g, "%23").replace(/;/g, "%3B").replace(/\(/g, "%28").replace(/\)/g, "%29"));
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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.value;
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for (var i = 0; i < args.length; i++) {
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str = str.replace(/%[sda]/i, function(token) {
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var value = token.match(/s/i) ? args[i].value : args[i].toCSS();
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return token.match(/[A-Z]$/) ? encodeURIComponent(value) : value;
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});
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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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unit: function (val, unit) {
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return new(tree.Dimension)(val.value, unit ? unit.toCSS() : "");
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},
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convert: function (val, unit) {
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return val.convertTo(unit.value);
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},
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round: function (n, f) {
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var fraction = typeof(f) === "undefined" ? 0 : f.value;
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return this._math(function(num) { return num.toFixed(fraction); }, null, n);
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},
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pi: function () {
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return new(tree.Dimension)(Math.PI);
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},
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mod: function(a, b) {
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return new(tree.Dimension)(a.value % b.value, a.unit);
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},
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pow: function(x, y) {
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if (typeof x === "number" && typeof y === "number") {
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x = new(tree.Dimension)(x);
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y = new(tree.Dimension)(y);
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} else if (!(x instanceof tree.Dimension) || !(y instanceof tree.Dimension)) {
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throw { type: "Argument", message: "arguments must be numbers" };
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}
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return new(tree.Dimension)(Math.pow(x.value, y.value), x.unit);
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},
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_math: function (fn, unit, n) {
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if (n instanceof tree.Dimension) {
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return new(tree.Dimension)(fn(parseFloat(n.value)), unit == null ? n.unit : unit);
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} else if (typeof(n) === 'number') {
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return fn(n);
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} else {
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throw { type: "Argument", message: "argument must be a number" };
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}
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},
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argb: function (color) {
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return new(tree.Anonymous)(color.toARGB());
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},
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percentage: function (n) {
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return new(tree.Dimension)(n.value * 100, '%');
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},
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color: function (n) {
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if (n instanceof tree.Quoted) {
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return new(tree.Color)(n.value.slice(1));
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} else {
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throw { type: "Argument", message: "argument must be a string" };
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}
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},
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iscolor: function (n) {
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return this._isa(n, tree.Color);
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},
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isnumber: function (n) {
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return this._isa(n, tree.Dimension);
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},
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isstring: function (n) {
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return this._isa(n, tree.Quoted);
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},
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iskeyword: function (n) {
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return this._isa(n, tree.Keyword);
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},
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isurl: function (n) {
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return this._isa(n, tree.URL);
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},
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ispixel: function (n) {
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return (n instanceof tree.Dimension) && n.unit.is('px') ? tree.True : tree.False;
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},
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ispercentage: function (n) {
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return (n instanceof tree.Dimension) && n.unit.is('%') ? tree.True : tree.False;
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},
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isem: function (n) {
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return (n instanceof tree.Dimension) && n.unit.is('em') ? tree.True : tree.False;
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},
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_isa: function (n, Type) {
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return (n instanceof Type) ? tree.True : tree.False;
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},
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/* Blending modes */
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multiply: function(color1, color2) {
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var r = color1.rgb[0] * color2.rgb[0] / 255;
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var g = color1.rgb[1] * color2.rgb[1] / 255;
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var b = color1.rgb[2] * color2.rgb[2] / 255;
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return this.rgb(r, g, b);
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},
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screen: function(color1, color2) {
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var r = 255 - (255 - color1.rgb[0]) * (255 - color2.rgb[0]) / 255;
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var g = 255 - (255 - color1.rgb[1]) * (255 - color2.rgb[1]) / 255;
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var b = 255 - (255 - color1.rgb[2]) * (255 - color2.rgb[2]) / 255;
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return this.rgb(r, g, b);
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},
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overlay: function(color1, color2) {
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var r = color1.rgb[0] < 128 ? 2 * color1.rgb[0] * color2.rgb[0] / 255 : 255 - 2 * (255 - color1.rgb[0]) * (255 - color2.rgb[0]) / 255;
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var g = color1.rgb[1] < 128 ? 2 * color1.rgb[1] * color2.rgb[1] / 255 : 255 - 2 * (255 - color1.rgb[1]) * (255 - color2.rgb[1]) / 255;
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var b = color1.rgb[2] < 128 ? 2 * color1.rgb[2] * color2.rgb[2] / 255 : 255 - 2 * (255 - color1.rgb[2]) * (255 - color2.rgb[2]) / 255;
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return this.rgb(r, g, b);
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},
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softlight: function(color1, color2) {
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var t = color2.rgb[0] * color1.rgb[0] / 255;
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var r = t + color1.rgb[0] * (255 - (255 - color1.rgb[0]) * (255 - color2.rgb[0]) / 255 - t) / 255;
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t = color2.rgb[1] * color1.rgb[1] / 255;
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var g = t + color1.rgb[1] * (255 - (255 - color1.rgb[1]) * (255 - color2.rgb[1]) / 255 - t) / 255;
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t = color2.rgb[2] * color1.rgb[2] / 255;
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var b = t + color1.rgb[2] * (255 - (255 - color1.rgb[2]) * (255 - color2.rgb[2]) / 255 - t) / 255;
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return this.rgb(r, g, b);
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},
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hardlight: function(color1, color2) {
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var r = color2.rgb[0] < 128 ? 2 * color2.rgb[0] * color1.rgb[0] / 255 : 255 - 2 * (255 - color2.rgb[0]) * (255 - color1.rgb[0]) / 255;
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var g = color2.rgb[1] < 128 ? 2 * color2.rgb[1] * color1.rgb[1] / 255 : 255 - 2 * (255 - color2.rgb[1]) * (255 - color1.rgb[1]) / 255;
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var b = color2.rgb[2] < 128 ? 2 * color2.rgb[2] * color1.rgb[2] / 255 : 255 - 2 * (255 - color2.rgb[2]) * (255 - color1.rgb[2]) / 255;
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return this.rgb(r, g, b);
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},
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difference: function(color1, color2) {
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var r = Math.abs(color1.rgb[0] - color2.rgb[0]);
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var g = Math.abs(color1.rgb[1] - color2.rgb[1]);
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var b = Math.abs(color1.rgb[2] - color2.rgb[2]);
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return this.rgb(r, g, b);
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},
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exclusion: function(color1, color2) {
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var r = color1.rgb[0] + color2.rgb[0] * (255 - color1.rgb[0] - color1.rgb[0]) / 255;
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var g = color1.rgb[1] + color2.rgb[1] * (255 - color1.rgb[1] - color1.rgb[1]) / 255;
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var b = color1.rgb[2] + color2.rgb[2] * (255 - color1.rgb[2] - color1.rgb[2]) / 255;
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return this.rgb(r, g, b);
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},
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average: function(color1, color2) {
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var r = (color1.rgb[0] + color2.rgb[0]) / 2;
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var g = (color1.rgb[1] + color2.rgb[1]) / 2;
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var b = (color1.rgb[2] + color2.rgb[2]) / 2;
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return this.rgb(r, g, b);
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},
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negation: function(color1, color2) {
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var r = 255 - Math.abs(255 - color2.rgb[0] - color1.rgb[0]);
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var g = 255 - Math.abs(255 - color2.rgb[1] - color1.rgb[1]);
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var b = 255 - Math.abs(255 - color2.rgb[2] - color1.rgb[2]);
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return this.rgb(r, g, b);
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},
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tint: function(color, amount) {
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return this.mix(this.rgb(255,255,255), color, amount);
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},
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shade: function(color, amount) {
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return this.mix(this.rgb(0, 0, 0), color, amount);
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},
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extract: function(values, index) {
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index = index.value - 1; // (1-based index)
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return values.value[index];
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},
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"data-uri": function(mimetype, path) {
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if (typeof window !== 'undefined') {
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return new less.tree.URL(path || mimetype, this.rootpath).eval(this.env);
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}
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mimetype = mimetype.value;
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path = (path && path.value);
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var fs = require('fs');
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var useBase64 = false;
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// detect the mimetype if not given
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if (arguments.length < 2) {
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var mime = require('mime');
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path = mimetype;
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mimetype = mime.lookup(path);
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// use base 64 unless it's an ASCII or UTF-8 format
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var charset = mime.charsets.lookup(mimetype);
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useBase64 = ['US-ASCII', 'UTF-8'].indexOf(charset) < 0;
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if (useBase64) mimetype += ';base64';
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}
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else {
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useBase64 = /;base64$/.test(mimetype)
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}
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var buf = fs.readFileSync(path);
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buf = useBase64 ? buf.toString('base64')
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: encodeURIComponent(buf);
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var uri = "'data:"+mimetype+','+buf+"'";
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return new(tree.URL)(new(tree.Anonymous)(uri));
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}
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};
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var mathFunctions = [{name:"ceil"}, {name:"floor"}, {name: "sqrt"}, {name:"abs"},
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{name:"tan", unit: ""}, {name:"sin", unit: ""}, {name:"cos", unit: ""},
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{name:"atan", unit: "rad"}, {name:"asin", unit: "rad"}, {name:"acos", unit: "rad"}],
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createMathFunction = function(name, unit) {
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return function(n) {
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if (unit != null) {
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n = n.unify();
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}
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return this._math(Math[name], unit, n);
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};
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};
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for(var i = 0; i < mathFunctions.length; i++) {
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tree.functions[mathFunctions[i].name] = createMathFunction(mathFunctions[i].name, mathFunctions[i].unit);
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}
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function hsla(color) {
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return tree.functions.hsla(color.h, color.s, color.l, color.a);
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}
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function scaled(n, size) {
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if (n instanceof tree.Dimension && n.unit.is('%')) {
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return parseFloat(n.value * size / 100);
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} else {
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return number(n);
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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.is('%') ? n.value / 100 : n.value);
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} else if (typeof(n) === 'number') {
|
|
return n;
|
|
} else {
|
|
throw {
|
|
error: "RuntimeError",
|
|
message: "color functions take numbers as parameters"
|
|
};
|
|
}
|
|
}
|
|
|
|
function clamp(val) {
|
|
return Math.min(1, Math.max(0, val));
|
|
}
|
|
|
|
tree.functionCall = function(env, rootpath) {
|
|
this.env = env;
|
|
this.rootpath = rootpath;
|
|
};
|
|
|
|
tree.functionCall.prototype = tree.functions;
|
|
|
|
})(require('./tree'));
|