Add lab function to color module

include/faker-cxx/Color.h

@@ -84,5 +84,15 @@ class Color
      * @endcode
      */
     static std::string cmyk();
+
+    /**
+     * @brief Return a LAB color
+     *
+     * @returns LAB color formatted with lab(X,X,X)
+     * @code
+     * Color::lab() // "lab(98.74, 2.18, -2.35)"
+     * @endcode
+     */
+    static std::string lab();
 };
 }

src/modules/color/Color.cpp

@@ -102,4 +102,13 @@ std::string Color::cmyk()
     return FormatHelper::format("cmyk({:.2f}, {:.2f}, {:.2f}, {:.2f})", cyan, magenta, yellow, key);
 }
 
+std::string Color::lab()
+{
+    const std::floating_point auto lightness = Number::decimal<double>(100.0);
+    const std::floating_point auto redGreenValue = Number::decimal<double>(-128.0, 128.0);
+    const std::floating_point auto blueYellowValue = Number::decimal<double>(-128.0, 128.0);
+
+    return FormatHelper::format("lab({:.2f}, {:.2f}, {:.2f})", lightness, redGreenValue, blueYellowValue);
+}
+
 }

src/modules/color/ColorTest.cpp

@@ -192,3 +192,22 @@ TEST_F(ColorTest, shouldGenerateCmykColor)
     ASSERT_TRUE(0. <= yellow && yellow <= 1.);
     ASSERT_TRUE(0. <= key && key <= 1.);
 }
+
+TEST_F(ColorTest, shouldGenerateLabColor)
+{
+    const auto generatedLabColor = faker::Color::lab();
+    const auto labValues = faker::StringHelper::split(generatedLabColor.substr(4, generatedLabColor.size() - 1), " ");
+
+    auto offset = labValues[0].size();
+    const auto lightness = std::stod(labValues[0].data(), &offset);
+    offset = labValues[1].size();
+    const auto redGreenValue = std::stod(labValues[1].data(), &offset);
+    offset = labValues[2].size();
+    const auto blueYellowValue = std::stod(labValues[2].data(), &offset);
+
+    ASSERT_TRUE(generatedLabColor.starts_with("lab("));
+    ASSERT_TRUE(generatedLabColor.ends_with(")"));
+    ASSERT_TRUE(lightness >= 0. && lightness <= 100.);
+    ASSERT_TRUE(redGreenValue >= -128. && redGreenValue <= 128.);
+    ASSERT_TRUE(blueYellowValue >= -128. && blueYellowValue <= 128.);
+}