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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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string>
#include <unordered_map>
#include "src/tint/symbol.h"
namespace tint {
/// Holds mappings from symbols to their associated string names
class SymbolTable {
/// Constructor
/// @param program_id the identifier of the program that owns this symbol
/// table
explicit SymbolTable(tint::ProgramID program_id);
/// Copy constructor
SymbolTable(const SymbolTable&);
/// Move Constructor
/// Destructor
/// 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 Get(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;
/// Returns a new unique symbol with the given name, possibly suffixed with a
/// unique number.
/// @param name the symbol name
/// @returns a new, unnamed symbol with the given name. If the name is already
/// taken then this will be suffixed with an underscore and a unique numerical
/// value
Symbol New(std::string name = "");
/// Foreach calls the callback function `F` for each symbol in the table.
/// @param callback must be a function or function-like object with the
/// signature: `void(Symbol, const std::string&)`
template <typename F>
void Foreach(F&& callback) const {
for (auto it : symbol_to_name_) {
callback(it.first, it.second);
/// @returns the identifier of the Program that owns this symbol table.
tint::ProgramID ProgramID() const { return program_id_; }
// 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_;
tint::ProgramID program_id_;
/// @param symbol_table the SymbolTable
/// @returns the ProgramID that owns the given SymbolTable
inline ProgramID ProgramIDOf(const SymbolTable& symbol_table) {
return symbol_table.ProgramID();
} // namespace tint