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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_SYMBOL
#define SKSL_SYMBOL
#include "include/private/SkSLIRNode.h"
#include "include/private/SkSLProgramElement.h"
namespace SkSL {
/**
* Represents a symboltable entry.
*/
class Symbol : public IRNode {
public:
enum class Kind {
kExternal = (int) ProgramElement::Kind::kLast + 1,
kField,
kFunctionDeclaration,
kType,
kUnresolvedFunction,
kVariable,
kFirst = kExternal,
kLast = kVariable
};
Symbol(int offset, Kind kind, skstd::string_view name, const Type* type = nullptr)
: INHERITED(offset, (int) kind)
, fName(name)
, fType(type) {
SkASSERT(kind >= Kind::kFirst && kind <= Kind::kLast);
}
~Symbol() override {}
const Type& type() const {
SkASSERT(fType);
return *fType;
}
Kind kind() const {
return (Kind) fKind;
}
skstd::string_view name() const {
return fName;
}
/**
* Use is<T> to check the type of a symbol.
* e.g. replace `sym.kind() == Symbol::Kind::kVariable` with `sym.is<Variable>()`.
*/
template <typename T>
bool is() const {
return this->kind() == T::kSymbolKind;
}
/**
* Use as<T> to downcast symbols. e.g. replace `(Variable&) sym` with `sym.as<Variable>()`.
*/
template <typename T>
const T& as() const {
SkASSERT(this->is<T>());
return static_cast<const T&>(*this);
}
template <typename T>
T& as() {
SkASSERT(this->is<T>());
return static_cast<T&>(*this);
}
private:
skstd::string_view fName;
const Type* fType;
using INHERITED = IRNode;
friend class Type;
};
} // namespace SkSL
#endif
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