| 1 |
#ifndef INC_LexerSharedInputState_hpp__ |
| 2 |
#define INC_LexerSharedInputState_hpp__ |
| 3 |
|
| 4 |
/* ANTLR Translator Generator |
| 5 |
* Project led by Terence Parr at http://www.jGuru.com |
| 6 |
* Software rights: http://www.antlr.org/license.html |
| 7 |
* |
| 8 |
* $Id$ |
| 9 |
*/ |
| 10 |
|
| 11 |
#include <antlr/config.hpp> |
| 12 |
#include <antlr/InputBuffer.hpp> |
| 13 |
#include <antlr/RefCount.hpp> |
| 14 |
#include <antlr/CharBuffer.hpp> |
| 15 |
#include <string> |
| 16 |
|
| 17 |
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE |
| 18 |
namespace antlr { |
| 19 |
#endif |
| 20 |
|
| 21 |
/** This object contains the data associated with an |
| 22 |
* input stream of characters. Multiple lexers |
| 23 |
* share a single LexerSharedInputState to lex |
| 24 |
* the same input stream. |
| 25 |
*/ |
| 26 |
class ANTLR_API LexerInputState { |
| 27 |
public: |
| 28 |
/** Construct a new LexerInputState |
| 29 |
* @param inbuf the InputBuffer to read from. The object is deleted together |
| 30 |
* with the LexerInputState object. |
| 31 |
*/ |
| 32 |
LexerInputState(InputBuffer* inbuf) |
| 33 |
: column(1) |
| 34 |
, line(1) |
| 35 |
, tokenStartColumn(1) |
| 36 |
, tokenStartLine(1) |
| 37 |
, guessing(0) |
| 38 |
, filename("") |
| 39 |
, input(inbuf) |
| 40 |
, inputResponsible(true) |
| 41 |
{ |
| 42 |
} |
| 43 |
|
| 44 |
/** Construct a new LexerInputState |
| 45 |
* @param inbuf the InputBuffer to read from. |
| 46 |
*/ |
| 47 |
LexerInputState(InputBuffer& inbuf) |
| 48 |
: column(1) |
| 49 |
, line(1) |
| 50 |
, tokenStartColumn(1) |
| 51 |
, tokenStartLine(1) |
| 52 |
, guessing(0) |
| 53 |
, filename("") |
| 54 |
, input(&inbuf) |
| 55 |
, inputResponsible(false) |
| 56 |
{ |
| 57 |
} |
| 58 |
|
| 59 |
/** Construct a new LexerInputState |
| 60 |
* @param in an istream to read from. |
| 61 |
* @see antlr.CharBuffer |
| 62 |
*/ |
| 63 |
LexerInputState(ANTLR_USE_NAMESPACE(std)istream& in) |
| 64 |
: column(1) |
| 65 |
, line(1) |
| 66 |
, tokenStartColumn(1) |
| 67 |
, tokenStartLine(1) |
| 68 |
, guessing(0) |
| 69 |
, filename("") |
| 70 |
, input(new CharBuffer(in)) |
| 71 |
, inputResponsible(true) |
| 72 |
{ |
| 73 |
} |
| 74 |
|
| 75 |
/** Reset the LexerInputState with a specified stream and filename. |
| 76 |
* This method is a hack, dunno what I was thinking when I added it. |
| 77 |
* This should actually be done in a subclass. |
| 78 |
* @deprecated |
| 79 |
*/ |
| 80 |
virtual void initialize( ANTLR_USE_NAMESPACE(std)istream& in, const char* file = "" ) |
| 81 |
{ |
| 82 |
column = 1; |
| 83 |
line = 1; |
| 84 |
tokenStartColumn = 1; |
| 85 |
tokenStartLine = 1; |
| 86 |
guessing = 0; |
| 87 |
filename = file; |
| 88 |
|
| 89 |
if( input && inputResponsible ) |
| 90 |
delete input; |
| 91 |
|
| 92 |
input = new CharBuffer(in); |
| 93 |
inputResponsible = true; |
| 94 |
} |
| 95 |
|
| 96 |
/** Reset the LexerInputState to initial state. |
| 97 |
* The underlying InputBuffer is also reset. |
| 98 |
*/ |
| 99 |
virtual void reset( void ) |
| 100 |
{ |
| 101 |
column = 1; |
| 102 |
line = 1; |
| 103 |
tokenStartColumn = 1; |
| 104 |
tokenStartLine = 1; |
| 105 |
guessing = 0; |
| 106 |
input->reset(); |
| 107 |
} |
| 108 |
|
| 109 |
/** Set the file position of the SharedLexerInputState. |
| 110 |
* @param line_ line number to be set |
| 111 |
* @param column_ column number to be set |
| 112 |
*/ |
| 113 |
void setPosition( int line_, int column_ ) |
| 114 |
{ |
| 115 |
line = line_; |
| 116 |
column = column_; |
| 117 |
} |
| 118 |
|
| 119 |
virtual ~LexerInputState() |
| 120 |
{ |
| 121 |
if (inputResponsible) |
| 122 |
delete input; |
| 123 |
} |
| 124 |
|
| 125 |
int column; |
| 126 |
int line; |
| 127 |
int tokenStartColumn; |
| 128 |
int tokenStartLine; |
| 129 |
int guessing; |
| 130 |
/** What file (if known) caused the problem? */ |
| 131 |
ANTLR_USE_NAMESPACE(std)string filename; |
| 132 |
InputBuffer& getInput(); |
| 133 |
private: |
| 134 |
/// Input buffer we use |
| 135 |
InputBuffer* input; |
| 136 |
/// Who is responsible for cleaning up the InputBuffer? |
| 137 |
bool inputResponsible; |
| 138 |
|
| 139 |
// we don't want these: |
| 140 |
LexerInputState(const LexerInputState&); |
| 141 |
LexerInputState& operator=(const LexerInputState&); |
| 142 |
}; |
| 143 |
|
| 144 |
inline InputBuffer& LexerInputState::getInput() |
| 145 |
{ |
| 146 |
return *input; |
| 147 |
} |
| 148 |
|
| 149 |
/// A reference counted LexerInputState object |
| 150 |
typedef RefCount<LexerInputState> LexerSharedInputState; |
| 151 |
|
| 152 |
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE |
| 153 |
} |
| 154 |
#endif |
| 155 |
|
| 156 |
#endif //INC_LexerSharedInputState_hpp__ |
