SkSLPostfixExpression.h

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/*
 * 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_POSTFIXEXPRESSION
#define SKSL_POSTFIXEXPRESSION
 
#include "src/sksl/SkSLOperator.h"
#include "src/sksl/SkSLPosition.h"
#include "src/sksl/ir/SkSLExpression.h"
#include "src/sksl/ir/SkSLIRNode.h"
 
#include <memory>
#include <string>
#include <utility>
 
namespace SkSL {
 
class Context;
 
/**
 * An expression modified by a unary operator appearing after it, such as 'i++'.
 */
class PostfixExpression final : public Expression {
public:
    inline static constexpr Kind kIRNodeKind = Kind::kPostfix;
 
    PostfixExpression(Position pos, std::unique_ptr<Expression> operand, Operator op)
            : INHERITED(pos, kIRNodeKind, &operand->type())
            , fOperand(std::move(operand))
            , fOperator(op) {}
 
    // Creates an SkSL postfix expression; uses the ErrorReporter to report errors.
    static std::unique_ptr<Expression> Convert(const Context& context,
                                               Position pos,
                                               std::unique_ptr<Expression> base,
                                               Operator op);
 
    // Creates an SkSL postfix expression; reports errors via ASSERT.
    static std::unique_ptr<Expression> Make(const Context& context,
                                            Position pos,
                                            std::unique_ptr<Expression> base,
                                            Operator op);
 
    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<PostfixExpression>(pos, this->operand()->clone(),
                                                   this->getOperator());
    }
 
    std::string description(OperatorPrecedence parentPrecedence) const override;
 
private:
    std::unique_ptr<Expression> fOperand;
    Operator fOperator;
 
    using INHERITED = Expression;
};
 
}  // namespace SkSL
 
#endif