1 files changed, 73 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/sksl/ir/SkSLPrefixExpression.h b/gfx/skia/skia/src/sksl/ir/SkSLPrefixExpression.h
new file mode 100644
index 0000000000..58c41d404a
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+++ b/gfx/skia/skia/src/sksl/ir/SkSLPrefixExpression.h
@@ -0,0 +1,73 @@
+/*
+ * 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_PREFIXEXPRESSION
+#define SKSL_PREFIXEXPRESSION
+
+#include "include/private/SkSLIRNode.h"
+#include "include/sksl/SkSLOperator.h"
+#include "include/sksl/SkSLPosition.h"
+#include "src/sksl/ir/SkSLExpression.h"
+
+#include <memory>
+#include <string>
+#include <utility>
+
+namespace SkSL {
+
+class Context;
+
+/**
+ * An expression modified by a unary operator appearing before it, such as '!flag'.
+ */
+class PrefixExpression final : public Expression {
+public:
+    inline static constexpr Kind kIRNodeKind = Kind::kPrefix;
+
+    // Use PrefixExpression::Make to automatically simplify various prefix expression types.
+    PrefixExpression(Position pos, Operator op, std::unique_ptr<Expression> operand)
+        : INHERITED(pos, kIRNodeKind, &operand->type())
+        , fOperator(op)
+        , fOperand(std::move(operand)) {}
+
+    // Creates an SkSL prefix expression; uses the ErrorReporter to report errors.
+    static std::unique_ptr<Expression> Convert(const Context& context, Position pos, Operator op,
+                                               std::unique_ptr<Expression> base);
+
+    // Creates an SkSL prefix expression; reports errors via ASSERT.
+    static std::unique_ptr<Expression> Make(const Context& context, Position pos, Operator op,
+                                            std::unique_ptr<Expression> base);
+
+    Operator getOperator() const {
+        return fOperator;
+    }
+
+    std::unique_ptr<Expression>& operand() {
+        return fOperand;
+    }
+
+    const std::unique_ptr<Expression>& operand() const {
+        return fOperand;
+    }
+
+    std::unique_ptr<Expression> clone(Position pos) const override {
+        return std::make_unique<PrefixExpression>(pos, this->getOperator(),
+                                                  this->operand()->clone());
+    }
+
+    std::string description(OperatorPrecedence parentPrecedence) const override;
+
+private:
+    Operator fOperator;
+    std::unique_ptr<Expression> fOperand;
+
+    using INHERITED = Expression;
+};
+
+}  // namespace SkSL
+
+#endif