PTHLexer.h revision 17ff58a63197b398ae52697b088dc0fb8b255519 
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
19namespace clang {
20
21class PTHLexer : public PreprocessorLexer {
22  /// FileLoc - Location for the start of the file.
23  ///
24  SourceLocation FileLoc;
25
26  /// Tokens - This is the pointer to an array of tokens that the macro is
27  /// defined to, with arguments expanded for function-like macros.  If this is
28  /// a token stream, these are the tokens we are returning.
29  const Token *Tokens;
30
31  /// NumTokens - This is the length of the Tokens array.
32  ///
33  unsigned NumTokens;
34
35  /// CurToken - This is the next token that Lex will return.
36  ///
37  unsigned CurToken;
38
39  PTHLexer(const PTHLexer&);  // DO NOT IMPLEMENT
40  void operator=(const PTHLexer&); // DO NOT IMPLEMENT
41
42public:
43
44  /// Create a PTHLexer for the specified token stream.
45  PTHLexer(Preprocessor& pp, SourceLocation fileloc,
46           const Token *TokArray, unsigned NumToks);
47  ~PTHLexer() {}
48
49  /// Lex - Return the next token.
50  void Lex(Token &Tok);
51
52  void setEOF(Token &Tok);
53
54  /// getFileLoc - Return the File Location for the file we are lexing out of.
55  /// The physical location encodes the location where the characters come from,
56  /// the virtual location encodes where we should *claim* the characters came
57  /// from.  Currently this is only used by _Pragma handling.
58  SourceLocation getFileLoc() const { return FileLoc; }
59
60  /// ReadToEndOfLine - Read the rest of the current preprocessor line as an
61  /// uninterpreted string.  This switches the lexer out of directive mode.
62  void DiscardToEndOfLine();
63};
64
65}  // end namespace clang
66
67#endif
68