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88 lines
1.8 KiB
88 lines
1.8 KiB
4 months ago
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/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SKSL_STATEMENT
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#define SKSL_STATEMENT
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#include "include/private/SkSLIRNode.h"
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#include "include/private/SkSLSymbol.h"
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namespace SkSL {
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/**
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* Abstract supertype of all statements.
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*/
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class Statement : public IRNode {
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public:
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enum Kind {
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kBlock = (int) Symbol::Kind::kLast + 1,
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kBreak,
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kContinue,
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kDiscard,
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kDo,
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kExpression,
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kFor,
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kIf,
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kInlineMarker,
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kNop,
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kReturn,
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kSwitch,
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kSwitchCase,
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kVarDeclaration,
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kFirst = kBlock,
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kLast = kVarDeclaration,
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};
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Statement(int offset, Kind kind)
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: INHERITED(offset, (int) kind) {
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SkASSERT(kind >= Kind::kFirst && kind <= Kind::kLast);
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}
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Kind kind() const {
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return (Kind) fKind;
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}
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/**
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* Use is<T> to check the type of a statement.
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* e.g. replace `s.kind() == Statement::Kind::kReturn` with `s.is<ReturnStatement>()`.
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*/
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template <typename T>
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bool is() const {
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return this->fKind == T::kStatementKind;
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}
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/**
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* Use as<T> to downcast statements.
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* e.g. replace `(ReturnStatement&) s` with `s.as<ReturnStatement>()`.
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*/
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template <typename T>
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const T& as() const {
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SkASSERT(this->is<T>());
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return static_cast<const T&>(*this);
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}
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template <typename T>
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T& as() {
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SkASSERT(this->is<T>());
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return static_cast<T&>(*this);
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}
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virtual bool isEmpty() const {
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return false;
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}
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virtual std::unique_ptr<Statement> clone() const = 0;
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private:
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using INHERITED = IRNode;
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};
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} // namespace SkSL
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#endif
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