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// Copyright 2015 Google Inc. All rights reserved
//
// 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 SYMTAB_H_
#define SYMTAB_H_
#include <string>
#include <vector>
#include "string_piece.h"
using namespace std;
extern vector<string*>* g_symbols;
class Symtab;
class Var;
class Symbol {
public:
struct IsUninitialized {};
explicit Symbol(IsUninitialized) : v_(-1) {}
const string& str() const { return *((*g_symbols)[v_]); }
const char* c_str() const { return str().c_str(); }
bool empty() const { return !v_; }
int val() const { return v_; }
char get(size_t i) const {
const string& s = str();
if (i >= s.size())
return 0;
return s[i];
}
bool IsValid() const { return v_ >= 0; }
Var* PeekGlobalVar() const;
Var* GetGlobalVar() const;
void SetGlobalVar(Var* v,
bool is_override = false,
bool* readonly = nullptr) const;
private:
explicit Symbol(int v);
int v_;
friend class Symtab;
};
class ScopedGlobalVar {
public:
ScopedGlobalVar(Symbol name, Var* var);
~ScopedGlobalVar();
private:
Symbol name_;
Var* orig_;
};
inline bool operator==(const Symbol& x, const Symbol& y) {
return x.val() == y.val();
}
inline bool operator<(const Symbol& x, const Symbol& y) {
return x.val() < y.val();
}
namespace std {
template <>
struct hash<Symbol> {
size_t operator()(const Symbol& s) const { return s.val(); }
};
} // namespace std
extern Symbol kEmptySym;
extern Symbol kShellSym;
void InitSymtab();
void QuitSymtab();
Symbol Intern(StringPiece s);
string JoinSymbols(const vector<Symbol>& syms, const char* sep);
#endif // SYMTAB_H_
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