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// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_SYMBOL_TABLE_H_
#define SRC_SYMBOL_TABLE_H_
#include <string>
#include <unordered_map>
#include "src/symbol.h"
namespace tint {
/// Holds mappings from symbols to their associated string names
class SymbolTable {
public:
/// Constructor
SymbolTable();
/// Copy constructor
SymbolTable(const SymbolTable&);
/// Move Constructor
SymbolTable(SymbolTable&&);
/// Destructor
~SymbolTable();
/// Copy assignment
/// @param other the symbol table to copy
/// @returns the new symbol table
SymbolTable& operator=(const SymbolTable& other);
/// Move assignment
/// @param other the symbol table to move
/// @returns the symbol table
SymbolTable& operator=(SymbolTable&& other);
/// Registers a name into the symbol table, returning the Symbol.
/// @param name the name to register
/// @returns the symbol representing the given name
Symbol Register(const std::string& name);
/// Returns the symbol for the given `name`
/// @param name the name to lookup
/// @returns the symbol for the name or symbol::kInvalid if not found.
Symbol GetSymbol(const std::string& name) const;
/// Returns the name for the given symbol
/// @param symbol the symbol to retrieve the name for
/// @returns the symbol name or "" if not found
std::string NameFor(const Symbol symbol) const;
private:
// The value to be associated to the next registered symbol table entry.
uint32_t next_symbol_ = 1;
std::unordered_map<Symbol, std::string> symbol_to_name_;
std::unordered_map<std::string, Symbol> name_to_symbol_;
};
} // namespace tint
#endif // SRC_SYMBOL_TABLE_H_