Create and test source mapping for invocations.

tests/compiler/dart2js/sourcemaps/colors.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// Utility library for creating web colors.
+
+library colors;
+
+/// A web color.
+abstract class Color {
+  /// The hexadecimal code for the color, without the prefixed '#'.
+  String get toHex;
+}
+
+/// A web color defined as RGB.
+class RGB implements Color {
+  final double r;
+  final double g;
+  final double b;
+
+  /// Creates a color defined by the amount of red [r], green [g], and blue [b]
+  /// all in range 0..1.
+  const RGB(this.r, this.g, this.b);
+
+  String get toHex {
+    StringBuffer sb = new StringBuffer();
+
+    void writeHex(double value) {
+      int i = (value * 255.0).round();
+      if (i < 16) {
+        sb.write('0');
+      }
+      sb.write(i.toRadixString(16));
+    }
+
+    writeHex(r);
+    writeHex(g);
+    writeHex(b);
+
+    return sb.toString();
+  }
+
+  String toString() => 'rgb($r,$g,$b)';
+}
+
+/// A web color defined as HSV.
+class HSV implements Color {
+  final double h;
+  final double s;
+  final double v;
+
+  /// Creates a color defined by the hue [h] in range 0..360 (360 excluded),
+  /// saturation [s] in range 0..1, and value [v] in range 0..1.
+  const HSV(this.h, this.s, this.v);
+
+  String get toHex => toRGB(this).toHex;
+
+  static RGB toRGB(HSV hsv) {
+    double h = hsv.h;
+    double s = hsv.s;
+    double v = hsv.v;
+    if (s == 0.0) {
+      // Grey.
+      return new RGB(v, v, v);
+    }
+    h /= 60.0;  // Sector 0 to 5.
+    int i = h.floor();
+    double f = h - i; // Factorial part of [h].
+    double p = v * (1.0 - s);
+    double q = v * (1.0 - s * f);
+    double t = v * (1.0 - s * (1.0 - f ));
+    switch (i) {
+      case 0:
+        return new RGB(v, t, p);
+      case 1:
+        return new RGB(q, v, p);
+      case 2:
+        return new RGB(p, v, t);
+      case 3:
+        return new RGB(p, q, v);
+      case 4:
+        return new RGB(t, p, v);
+      default:    // case 5:
+        return new RGB(v, p, q);
+    }
+  }
+
+  String toString() => 'hsv($h,$s,$v)';
+}