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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_PREFIXEXPRESSION
#define SKSL_PREFIXEXPRESSION
#include "SkSLExpression.h"
#include "SkSLFloatLiteral.h"
#include "SkSLIRGenerator.h"
#include "SkSLToken.h"
namespace SkSL {
/**
* An expression modified by a unary operator appearing before it, such as '!flag'.
*/
struct PrefixExpression : public Expression {
PrefixExpression(Token::Kind op, std::unique_ptr<Expression> operand)
: INHERITED(operand->fPosition, kPrefix_Kind, operand->fType)
, fOperand(std::move(operand))
, fOperator(op) {}
bool isConstant() const override {
return fOperator == Token::MINUS && fOperand->isConstant();
}
bool hasSideEffects() const override {
return fOperator == Token::PLUSPLUS || fOperator == Token::MINUSMINUS ||
fOperand->hasSideEffects();
}
std::unique_ptr<Expression> constantPropagate(const IRGenerator& irGenerator,
const DefinitionMap& definitions) override {
if (fOperand->fKind == Expression::kFloatLiteral_Kind) {
return std::unique_ptr<Expression>(new FloatLiteral(
irGenerator.fContext,
Position(),
-((FloatLiteral&) *fOperand).fValue));
}
return nullptr;
}
String description() const override {
return Token::OperatorName(fOperator) + fOperand->description();
}
std::unique_ptr<Expression> fOperand;
const Token::Kind fOperator;
typedef Expression INHERITED;
};
} // namespace
#endif
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