initial checkin of SkSL compiler

src/sksl/ast/SkSLASTIndexSuffix.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_ASTINDEXSUFFIX
+#define SKSL_ASTINDEXSUFFIX
+
+#include "SkSLASTExpression.h"
+#include "SkSLASTSuffix.h"
+
+namespace SkSL {
+
+/**
+ * A bracketed expression, as in '[0]', indicating an array access. 
+ */
+struct ASTIndexSuffix : public ASTSuffix {
+    ASTIndexSuffix(std::unique_ptr<ASTExpression> expression) 
+    : INHERITED(expression->fPosition, ASTSuffix::kIndex_Kind)
+    , fExpression(std::move(expression)) {}
+
+    std::string description() const override {
+        return "[" + fExpression->description() + "]";
+    }
+
+    std::unique_ptr<ASTExpression> fExpression;
+
+    typedef ASTSuffix INHERITED;
+};
+
+} // namespace
+
+#endif