initial checkin of SkSL compiler

src/sksl/ast/SkSLASTWhileStatement.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_ASTWHILESTATEMENT
+#define SKSL_ASTWHILESTATEMENT
+
+#include "SkSLASTStatement.h"
+
+namespace SkSL {
+
+/**
+ * A 'while' statement.
+ */
+struct ASTWhileStatement : public ASTStatement {
+    ASTWhileStatement(Position position, std::unique_ptr<ASTExpression> test, 
+                      std::unique_ptr<ASTStatement> statement)
+    : INHERITED(position, kWhile_Kind)
+    , fTest(std::move(test))
+    , fStatement(std::move(statement)) {}
+
+    std::string description() const override {
+        return "while (" + fTest->description() + ") " + fStatement->description();
+    }
+
+    const std::unique_ptr<ASTExpression> fTest;
+    const std::unique_ptr<ASTStatement> fStatement;
+
+    typedef ASTStatement INHERITED;
+};
+
+} // namespace
+
+#endif