initial checkin of SkSL compiler

src/sksl/ast/SkSLASTTernaryExpression.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_ASTTERNARYEXPRESSION
+#define SKSL_ASTTERNARYEXPRESSION
+
+#include "SkSLASTExpression.h"
+
+namespace SkSL {
+
+/**
+ * A ternary expression (test ? ifTrue : ifFalse).
+ */
+struct ASTTernaryExpression : public ASTExpression {
+    ASTTernaryExpression(std::unique_ptr<ASTExpression> test,
+                         std::unique_ptr<ASTExpression> ifTrue,
+                         std::unique_ptr<ASTExpression> ifFalse)
+    : INHERITED(test->fPosition, kTernary_Kind)
+    , fTest(std::move(test))
+    , fIfTrue(std::move(ifTrue))
+    , fIfFalse(std::move(ifFalse)) {}
+
+    std::string description() const override {
+        return "(" + fTest->description() + " ? " + fIfTrue->description() + " : " +
+               fIfFalse->description() + ")";        
+    }
+
+    const std::unique_ptr<ASTExpression> fTest;
+    const std::unique_ptr<ASTExpression> fIfTrue;
+    const std::unique_ptr<ASTExpression> fIfFalse;
+
+    typedef ASTExpression INHERITED;
+};
+
+} // namespace
+
+#endif