104 lines
2.1 KiB
C++
104 lines
2.1 KiB
C++
// Copyright 2015 Google Inc. All rights reserved
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SYMTAB_H_
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#define SYMTAB_H_
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#include <string>
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#include <vector>
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#include "string_piece.h"
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using namespace std;
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extern vector<string*>* g_symbols;
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class Symtab;
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class Var;
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class Symbol {
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public:
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struct IsUninitialized {};
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explicit Symbol(IsUninitialized)
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: v_(-1) {
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}
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const string& str() const {
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return *((*g_symbols)[v_]);
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}
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const char* c_str() const {
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return str().c_str();
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}
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bool empty() const { return !v_; }
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int val() const { return v_; }
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char get(size_t i) const {
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const string& s = str();
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if (i >= s.size())
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return 0;
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return s[i];
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}
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bool IsValid() const { return v_ >= 0; }
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Var* GetGlobalVar() const;
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void SetGlobalVar(Var* v, bool is_override = false, bool* readonly = nullptr) const;
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private:
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explicit Symbol(int v);
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int v_;
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friend class Symtab;
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};
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class ScopedGlobalVar {
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public:
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ScopedGlobalVar(Symbol name, Var* var);
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~ScopedGlobalVar();
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private:
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Symbol name_;
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Var* orig_;
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};
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inline bool operator==(const Symbol& x, const Symbol& y) {
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return x.val() == y.val();
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}
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inline bool operator<(const Symbol& x, const Symbol& y) {
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return x.val() < y.val();
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}
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namespace std {
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template<> struct hash<Symbol> {
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size_t operator()(const Symbol& s) const {
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return s.val();
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}
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};
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}
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extern Symbol kEmptySym;
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extern Symbol kShellSym;
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void InitSymtab();
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void QuitSymtab();
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Symbol Intern(StringPiece s);
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string JoinSymbols(const vector<Symbol>& syms, const char* sep);
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#endif // SYMTAB_H_
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