initial checkin of SkSL compiler

src/sksl/ir/SkSLIfStatement.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+ 
+#ifndef SKSL_IFSTATEMENT
+#define SKSL_IFSTATEMENT
+
+#include "SkSLExpression.h"
+#include "SkSLStatement.h"
+
+namespace SkSL {
+
+/**
+ * An 'if' statement.
+ */
+struct IfStatement : public Statement {
+    IfStatement(Position position, std::unique_ptr<Expression> test, 
+                std::unique_ptr<Statement> ifTrue, std::unique_ptr<Statement> ifFalse)
+    : INHERITED(position, kIf_Kind)
+    , fTest(std::move(test))
+    , fIfTrue(std::move(ifTrue))
+    , fIfFalse(std::move(ifFalse)) {}
+
+    std::string description() const override {
+        std::string result = "if (" + fTest->description() + ") " + fIfTrue->description();
+        if (fIfFalse) {
+            result += " else " + fIfFalse->description();
+        }
+        return result;
+    }
+
+    const std::unique_ptr<Expression> fTest;
+    const std::unique_ptr<Statement> fIfTrue;
+    const std::unique_ptr<Statement> fIfFalse;
+
+    typedef Statement INHERITED;
+};
+
+} // namespace
+
+#endif