1 files changed, 61 insertions, 0 deletions
diff --git a/node_modules/clean-css/lib/optimizer/level-1/shorten-hsl.js b/node_modules/clean-css/lib/optimizer/level-1/shorten-hsl.js
new file mode 100644
index 000000000..fe98dfd39
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+++ b/node_modules/clean-css/lib/optimizer/level-1/shorten-hsl.js
@@ -0,0 +1,61 @@
+// HSL to RGB converter. Both methods adapted from:
+// http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
+
+function hslToRgb(h, s, l) {
+  var r, g, b;
+
+  // normalize hue orientation b/w 0 and 360 degrees
+  h = h % 360;
+  if (h < 0)
+    h += 360;
+  h = ~~h / 360;
+
+  if (s < 0)
+    s = 0;
+  else if (s > 100)
+    s = 100;
+  s = ~~s / 100;
+
+  if (l < 0)
+    l = 0;
+  else if (l > 100)
+    l = 100;
+  l = ~~l / 100;
+
+  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 [~~(r * 255), ~~(g * 255), ~~(b * 255)];
+}
+
+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 shortenHsl(hue, saturation, lightness) {
+  var asRgb = hslToRgb(hue, saturation, lightness);
+  var redAsHex = asRgb[0].toString(16);
+  var greenAsHex = asRgb[1].toString(16);
+  var blueAsHex = asRgb[2].toString(16);
+
+  return '#' +
+    ((redAsHex.length == 1 ? '0' : '') + redAsHex) +
+    ((greenAsHex.length == 1 ? '0' : '') + greenAsHex) +
+    ((blueAsHex.length == 1 ? '0' : '') + blueAsHex);
+}
+
+module.exports = shortenHsl;