1 files changed, 63 insertions, 0 deletions
diff --git a/include/mbgl/style/expression/dsl.hpp b/include/mbgl/style/expression/dsl.hpp
new file mode 100644
index 0000000000..b4e1ed436e
--- /dev/null
+++ b/include/mbgl/style/expression/dsl.hpp
@@ -0,0 +1,63 @@
+#pragma once
+
+#include <mbgl/style/expression/value.hpp>
+#include <mbgl/style/expression/expression.hpp>
+#include <mbgl/style/expression/interpolator.hpp>
+
+#include <memory>
+
+namespace mbgl {
+namespace style {
+namespace expression {
+namespace dsl {
+
+// This convenience API does little to no expression validation or type-checking, and is intended for
+// use only by test and other non-production code.
+
+std::unique_ptr<Expression> literal(const char* value);
+std::unique_ptr<Expression> literal(Value value);
+
+std::unique_ptr<Expression> number(std::unique_ptr<Expression>);
+std::unique_ptr<Expression> string(std::unique_ptr<Expression>);
+
+std::unique_ptr<Expression> toColor(const char* value);
+std::unique_ptr<Expression> toColor(std::unique_ptr<Expression>);
+
+std::unique_ptr<Expression> get(const char* value);
+std::unique_ptr<Expression> get(std::unique_ptr<Expression>);
+
+std::unique_ptr<Expression> id();
+std::unique_ptr<Expression> zoom();
+
+std::unique_ptr<Expression> eq(std::unique_ptr<Expression>,
+                               std::unique_ptr<Expression>);
+std::unique_ptr<Expression> ne(std::unique_ptr<Expression>,
+                               std::unique_ptr<Expression>);
+std::unique_ptr<Expression> gt(std::unique_ptr<Expression>,
+                               std::unique_ptr<Expression>);
+std::unique_ptr<Expression> lt(std::unique_ptr<Expression>,
+                               std::unique_ptr<Expression>);
+
+Interpolator linear();
+Interpolator exponential(double base);
+Interpolator cubicBezier(double x1, double y1, double x2, double y2);
+
+std::unique_ptr<Expression> interpolate(Interpolator interpolator,
+                                        std::unique_ptr<Expression> input,
+                                        double input1, std::unique_ptr<Expression> output1);
+
+std::unique_ptr<Expression> interpolate(Interpolator interpolator,
+                                        std::unique_ptr<Expression> input,
+                                        double input1, std::unique_ptr<Expression> output1,
+                                        double input2, std::unique_ptr<Expression> output2);
+
+std::unique_ptr<Expression> interpolate(Interpolator interpolator,
+                                        std::unique_ptr<Expression> input,
+                                        double input1, std::unique_ptr<Expression> output1,
+                                        double input2, std::unique_ptr<Expression> output2,
+                                        double input3, std::unique_ptr<Expression> output3);
+
+} // namespace dsl
+} // namespace expression
+} // namespace style
+} // namespace mbgl