PTHLexer.h revision 0c6a77bc1f52f282a969538f139ebde429076ed3 
1//===--- PTHLexer.h - Lexer based on Pre-tokenized input --------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines the PTHLexer interface.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_PTHLEXER_H
15#define LLVM_CLANG_PTHLEXER_H
16
17#include "clang/Lex/PreprocessorLexer.h"
18#include <vector>
19
20namespace clang {
21
22class PTHManager;
23
24class PTHLexer : public PreprocessorLexer {
25  /// TokBuf - Buffer from PTH file containing raw token data.
26  const char* TokBuf;
27
28  /// CurTokenIdx - This is the index of the next token that Lex will return.
29  unsigned CurTokenIdx;
30
31  PTHLexer(const PTHLexer&);  // DO NOT IMPLEMENT
32  void operator=(const PTHLexer&); // DO NOT IMPLEMENT
33
34  /// ReadToken - Used by PTHLexer to read tokens TokBuf.
35  void ReadToken(Token& T);
36
37  /// PTHMgr - The PTHManager object that created this PTHLexer.
38  PTHManager& PTHMgr;
39
40  Token LastFetched;
41  Token EofToken;
42  bool NeedsFetching;
43
44public:
45
46  /// Create a PTHLexer for the specified token stream.
47  PTHLexer(Preprocessor& pp, SourceLocation fileloc, const char* D,
48           PTHManager& PM);
49
50  ~PTHLexer() {}
51
52  /// Lex - Return the next token.
53  void Lex(Token &Tok);
54
55  void setEOF(Token &Tok);
56
57  /// DiscardToEndOfLine - Read the rest of the current preprocessor line as an
58  /// uninterpreted string.  This switches the lexer out of directive mode.
59  void DiscardToEndOfLine();
60
61  /// isNextPPTokenLParen - Return 1 if the next unexpanded token will return a
62  /// tok::l_paren token, 0 if it is something else and 2 if there are no more
63  /// tokens controlled by this lexer.
64  unsigned isNextPPTokenLParen() {
65    return AtLastToken() ? 2 : GetToken().is(tok::l_paren);
66  }
67
68  /// IndirectLex - An indirect call to 'Lex' that can be invoked via
69  ///  the PreprocessorLexer interface.
70  void IndirectLex(Token &Result) { Lex(Result); }
71
72private:
73
74  /// AtLastToken - Returns true if the PTHLexer is at the last token.
75  bool AtLastToken() {
76    Token T = GetToken();
77    return T.is(tok::eof) ? EofToken = T, true : false;
78  }
79
80  /// GetToken - Returns the next token.  This method does not advance the
81  ///  PTHLexer to the next token.
82  Token GetToken();
83
84  /// AdvanceToken - Advances the PTHLexer to the next token.
85  void AdvanceToken() { ++CurTokenIdx; NeedsFetching = true; }
86
87  bool LexEndOfFile(Token &Result);
88};
89
90}  // end namespace clang
91
92#endif
93