src/mdParser/MDParser.g

header
{

#include "antlr/CharScanner.hpp"
#include "utils/StringUtils.hpp"
#include "mdParser/FilenameObserver.hpp"
}

options
  {
  language = "Cpp";
  }
                     
class MDParser extends Parser;

options
{
        k = 3;
        exportVocab = MD;
        buildAST = true;
        codeGenMakeSwitchThreshold = 2;
        codeGenBitsetTestThreshold = 3;
        
}

tokens
{
  COMPONENT   = "component";
  MOLECULE    = "molecule";
  ZCONSTRAINT = "zconstraint";
  ATOM        = "atom";
  BOND        = "bond";
  BEND        = "bend";
  TORSION     = "torsion";
  RIGIDBODY   = "rigidBody";
  CUTOFFGROUP = "cutoffGroup";
  FRAGMENT    = "fragment";
  MEMBERS     = "members";
  POSITION    = "position";
  ORIENTATION = "orientation";
  ENDBLOCK;
}


mdfile  : (statement)*
        ;

statement : assignment
          | componentblock
          | moleculeblock
          | zconstraintblock
          ;
            
assignment  : ID ASSIGNEQUAL^ constant SEMICOLON!
            ;
            
constant    : signedNumber
            | ID
            | StringLiteral
            ;

componentblock  : COMPONENT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
                ;
    
zconstraintblock  : ZCONSTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
                  ;
  
moleculeblock : MOLECULE^ LCURLY! (moleculestatement)*  RCURLY {#RCURLY->setType(ENDBLOCK);}
              ;

moleculestatement : assignment
                  | atomblock
                  | bondblock
                  | bendblock
                  | torsionblock
                  | rigidbodyblock
                  | cutoffgroupblock
                  | fragmentblock
                  ;

atomblock : ATOM^ LBRACKET! intConst RBRACKET! LCURLY! (atomstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
          ;

atomstatement : assignment
              | POSITION^ LPAREN! signedNumberTuple RPAREN! SEMICOLON!
              | ORIENTATION^  LPAREN! signedNumberTuple RPAREN! SEMICOLON!
              ;

                      
bondblock : BOND^ (LBRACKET! intConst! RBRACKET!)?  LCURLY!(bondstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
          ;

bondstatement : assignment
              | MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
              ;

bendblock : BEND^ (LBRACKET! intConst! RBRACKET!)? LCURLY!  (bendstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
          ;

bendstatement : assignment
              | MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
              ;

torsionblock  : TORSION^ (LBRACKET! intConst! RBRACKET!)?  LCURLY!(torsionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
          ;

torsionstatement  : assignment
              | MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
              ;

rigidbodyblock  : RIGIDBODY^  LBRACKET! intConst RBRACKET! LCURLY!(rigidbodystatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
                ;

rigidbodystatement  : assignment
              | MEMBERS^ LPAREN!  inttuple  RPAREN! SEMICOLON!
              ;

cutoffgroupblock  : CUTOFFGROUP^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (cutoffgroupstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
                  ;

cutoffgroupstatement  : assignment
              | MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
              ;

fragmentblock : FRAGMENT^ LBRACKET! intConst RBRACKET! LCURLY! (fragmentstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
              ;

fragmentstatement : assignment
              ;


signedNumberTuple   : signedNumber (COMMA! signedNumber)* 
              ;
                          
inttuple      : intConst (COMMA! intConst)*
              ;
              
protected
intConst
        :  OCTALINT | DECIMALINT | HEXADECIMALINT
        ;

protected
signedNumber  :  
                (intConst | floatConst)
              ;
              
protected
floatConst
        : 
          FLOATONE | FLOATTWO
        ;


class MDLexer extends Lexer;

options
  {
  k = 3;
  exportVocab = MD;
  testLiterals = false;
  }

tokens {
    DOT;
}

{


        int deferredLineCount;
        FilenameObserver* observer;
        
  public:
        void setObserver(FilenameObserver* osv) {observer = osv;}
  void initDeferredLineCount() { deferredLineCount = 0;}
  void deferredNewline() { 
        deferredLineCount++;
  }

        
  virtual void newline() { 
                for (;deferredLineCount>0;deferredLineCount--) {
                        CharScanner::newline();
                }
    CharScanner::newline();
  }
    
}


// Operators:

ASSIGNEQUAL     : '=' ;
COLON           : ':' ;
COMMA           : ',' ;
QUESTIONMARK    : '?' ;
SEMICOLON       : ';' ;

LPAREN          : '(' ;
RPAREN          : ')' ;
LBRACKET        : '[' ;
RBRACKET        : ']' ;
LCURLY          : '{' ;
RCURLY          : '}' ;


/*
EQUAL           : "==" ;
NOTEQUAL        : "!=" ;
LESSTHANOREQUALTO     : "<=" ;
LESSTHAN              : "<" ;
GREATERTHANOREQUALTO  : ">=" ;
GREATERTHAN           : ">" ;

DIVIDE          : '/' ;
DIVIDEEQUAL     : "/=" ;
PLUS            : '+' ;
PLUSEQUAL       : "+=" ;
PLUSPLUS        : "++" ;
MINUS           : '-' ;
MINUSEQUAL      : "-=" ;
MINUSMINUS      : "--" ;
STAR            : '*' ;
TIMESEQUAL      : "*=" ;
MOD             : '%' ;
MODEQUAL        : "%=" ;
SHIFTRIGHT      : ">>" ;
SHIFTRIGHTEQUAL : ">>=" ;
SHIFTLEFT       : "<<" ;
SHIFTLEFTEQUAL  : "<<=" ;

AND            : "&&" ;
NOT            : '!' ;
OR             : "||" ;

AMPERSAND       : '&' ;
BITWISEANDEQUAL : "&=" ;
TILDE           : '~' ;
BITWISEOR       : '|' ;
BITWISEOREQUAL  : "|=" ;
BITWISEXOR      : '^' ;
BITWISEXOREQUAL : "^=" ;
*/


Whitespace  
  : 
    ( // whitespace ignored
      (' ' |'\t' | '\f')
    | // handle newlines
      ( '\r' '\n' // MS
      | '\r'    // Mac
      | '\n'    // Unix 
      ) { newline(); }
    | // handle continuation lines
      ( '\\' '\r' '\n'  // MS
      | '\\' '\r'   // Mac
      | '\\' '\n'   // Unix 
      ) {printf("CPP_parser.g continuation line detected\n");
        deferredNewline();}
    ) 
    {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
  ;

Comment  
  : 
    "/*"   
    ( {LA(2) != '/'}? '*'
    | EndOfLine {deferredNewline();}
    | ~('*'| '\r' | '\n')
    )*
    "*/" {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
  ;

CPPComment
  : 
    "//" (~('\n' | '\r'))* EndOfLine
    {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}                     
  ;

PREPROC_DIRECTIVE
  options{paraphrase = "a line directive";}
  : 
    '#' LineDirective
    {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();} 
  ;

protected 
LineDirective
  :
  {
   deferredLineCount = 0;
  }
    ("line")?  // this would be for if the directive started "#line"
    (Space)+
    n:Decimal { setLine(oopse::lexi_cast<int>(n->getText()) - 1); } 
    (Space)+
    (sl:StringLiteral) {std::string filename = sl->getText().substr(1,sl->getText().length()-2); observer->notify(filename);} 
    ((Space)+ Decimal)* // To support cpp flags (GNU)
    EndOfLine
  ;

protected  
Space
  : 
    (' '|'\t'|'\f')
  ;


// Literals:

/*
 * Note that we do NOT handle tri-graphs nor multi-byte sequences.
 */

/*
 * Note that we can't have empty character constants (even though we
 * can have empty strings :-).
 */
CharLiteral
  : 
    '\'' (Escape | ~('\'')) '\''
  ;

/*
 * Can't have raw imbedded newlines in string constants.  Strict reading of
 * the standard gives odd dichotomy between newlines & carriage returns.
 * Go figure.
 */
StringLiteral
  : 
    '"'
    ( Escape
    | 
      ( "\\\r\n"   // MS 
      | "\\\r"     // MAC
      | "\\\n"     // Unix
      ) {deferredNewline();}
    | 
      ~('"'|'\r'|'\n'|'\\')
    )*
    '"'
  ;

protected
EndOfLine
  : 
    ( options{generateAmbigWarnings = false;}:
      "\r\n"  // MS
    | '\r'    // Mac
    | '\n'    // Unix
    )
  ;

/*
 * Handle the various escape sequences.
 *
 * Note carefully that these numeric escape *sequences* are *not* of the
 * same form as the C language numeric *constants*.
 *
 * There is no such thing as a binary numeric escape sequence.
 *
 * Octal escape sequences are either 1, 2, or 3 octal digits exactly.
 *
 * There is no such thing as a decimal escape sequence.
 *
 * Hexadecimal escape sequences are begun with a leading \x and continue
 * until a non-hexadecimal character is found.
 *
 * No real handling of tri-graph sequences, yet.
 */

protected
Escape  
  : 
    '\\'
    ( options{warnWhenFollowAmbig=false;}:
      'a'
    | 'b'
    | 'f'
    | 'n'
    | 'r'
    | 't'
    | 'v'
    | '"'
    | '\''
    | '\\'
    | '?'
    | ('0'..'3') (options{warnWhenFollowAmbig=false;}: Digit (options{warnWhenFollowAmbig=false;}: Digit)? )?
    | ('4'..'7') (options{warnWhenFollowAmbig=false;}: Digit)?
    | 'x' (options{warnWhenFollowAmbig=false;}: Digit | 'a'..'f' | 'A'..'F')+
    )
  ;

// Numeric Constants: 

protected
Digit
  : 
    '0'..'9'
  ;

protected
Decimal
  : 
    ('0'..'9')+
  ;

protected
LongSuffix
  : 'l'
  | 'L'
  ;

protected
UnsignedSuffix
  : 'u'
  | 'U'
  ;

protected
FloatSuffix
  : 'f'
  | 'F'
  ;

protected
Exponent
  : 
    ('e'|'E'|'d'|'D') ('+'|'-')? (Digit)+
  ;

protected
Vocabulary
  : 
    '\3'..'\377'
  ;

Number
  :
  ('+'|'-')?
  (
    ( (Digit)+ ('.' | 'e' | 'E' | 'd' | 'D' ) )=> 
    (Digit)+
    ( '.' (Digit)* (Exponent)? {_ttype = FLOATONE;} //Zuo 3/12/01
    | Exponent                 {_ttype = FLOATTWO;} //Zuo 3/12/01
    )                          //{_ttype = DoubleDoubleConst;}
    (FloatSuffix               //{_ttype = FloatDoubleConst;}
    |LongSuffix                //{_ttype = LongDoubleConst;}
    )?
  | 
    '.'                        {_ttype = DOT;}
    ( (Digit)+ (Exponent)?   {_ttype = FLOATONE;} //Zuo 3/12/01
                                   //{_ttype = DoubleDoubleConst;}
      (FloatSuffix           //{_ttype = FloatDoubleConst;}
      |LongSuffix            //{_ttype = LongDoubleConst;}
      )?
    )?
  | 
    '0' ('0'..'7')*            //{_ttype = IntOctalConst;}
    (LongSuffix                //{_ttype = LongOctalConst;}
    |UnsignedSuffix            //{_ttype = UnsignedOctalConst;}
    )*                         {_ttype = OCTALINT;}
  | 
    '1'..'9' (Digit)*          //{_ttype = IntIntConst;}
    (LongSuffix                //{_ttype = LongIntConst;}
    |UnsignedSuffix            //{_ttype = UnsignedIntConst;}
    )*                         {_ttype = DECIMALINT;}  
  | 
    '0' ('x' | 'X') ('a'..'f' | 'A'..'F' | Digit)+
                                   //{_ttype = IntHexConst;}
    (LongSuffix                //{_ttype = LongHexConst;}
    |UnsignedSuffix            //{_ttype = UnsignedHexConst;}
    )*                         {_ttype = HEXADECIMALINT;}   
  )
  ;

ID
  options {testLiterals = true;}
  : 
    ('a'..'z'|'A'..'Z'|'_')
    ('a'..'z'|'A'..'Z'|'_'|'0'..'9')*
  ;
Revision:	810
Committed:	Wed Dec 14 18:02:28 2005 UTC (19 years, 4 months ago) by tim
Original Path:	*trunk/src/mdParser/MDParser.g*
File size:	10735 byte(s)
Log Message:	fix a nasty negative integer parsing problem by refining the grammar
#	User	Rev	Content
1	tim	770	header
2			{
3
4			#include "antlr/CharScanner.hpp"
5			#include "utils/StringUtils.hpp"
6			#include "mdParser/FilenameObserver.hpp"
7			}
8
9			options
10			{
11			language = "Cpp";
12			}
13
14			class MDParser extends Parser;
15
16			options
17			{
18			k = 3;
19			exportVocab = MD;
20			buildAST = true;
21			codeGenMakeSwitchThreshold = 2;
22			codeGenBitsetTestThreshold = 3;
23
24			}
25
26			tokens
27			{
28			COMPONENT = "component";
29			MOLECULE = "molecule";
30			ZCONSTRAINT = "zconstraint";
31			ATOM = "atom";
32			BOND = "bond";
33			BEND = "bend";
34			TORSION = "torsion";
35			RIGIDBODY = "rigidBody";
36			CUTOFFGROUP = "cutoffGroup";
37			FRAGMENT = "fragment";
38			MEMBERS = "members";
39			POSITION = "position";
40			ORIENTATION = "orientation";
41			ENDBLOCK;
42			}
43
44
45			mdfile : (statement)*
46			;
47
48			statement : assignment
49			\| componentblock
50			\| moleculeblock
51			\| zconstraintblock
52			;
53
54			assignment : ID ASSIGNEQUAL^ constant SEMICOLON!
55			;
56
57			constant : signedNumber
58			\| ID
59			\| StringLiteral
60			;
61
62			componentblock : COMPONENT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
63			;
64
65			zconstraintblock : ZCONSTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
66			;
67
68			moleculeblock : MOLECULE^ LCURLY! (moleculestatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
69			;
70
71			moleculestatement : assignment
72			\| atomblock
73			\| bondblock
74			\| bendblock
75			\| torsionblock
76			\| rigidbodyblock
77			\| cutoffgroupblock
78			\| fragmentblock
79			;
80
81			atomblock : ATOM^ LBRACKET! intConst RBRACKET! LCURLY! (atomstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
82			;
83
84			atomstatement : assignment
85			\| POSITION^ LPAREN! signedNumberTuple RPAREN! SEMICOLON!
86			\| ORIENTATION^ LPAREN! signedNumberTuple RPAREN! SEMICOLON!
87			;
88
89
90			bondblock : BOND^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(bondstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
91			;
92
93			bondstatement : assignment
94			\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
95			;
96
97			bendblock : BEND^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (bendstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
98			;
99
100			bendstatement : assignment
101			\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
102			;
103
104			torsionblock : TORSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(torsionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
105			;
106
107			torsionstatement : assignment
108			\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
109			;
110
111			rigidbodyblock : RIGIDBODY^ LBRACKET! intConst RBRACKET! LCURLY!(rigidbodystatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
112			;
113
114			rigidbodystatement : assignment
115			\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
116			;
117
118			cutoffgroupblock : CUTOFFGROUP^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (cutoffgroupstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
119			;
120
121			cutoffgroupstatement : assignment
122			\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
123			;
124
125			fragmentblock : FRAGMENT^ LBRACKET! intConst RBRACKET! LCURLY! (fragmentstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
126			;
127
128			fragmentstatement : assignment
129			;
130
131
132
133			signedNumberTuple : signedNumber (COMMA! signedNumber)*
134			;
135
136			inttuple : intConst (COMMA! intConst)*
137			;
138
139			protected
140			intConst
141			: OCTALINT \| DECIMALINT \| HEXADECIMALINT
142			;
143
144			protected
145	tim	810	signedNumber :
146	tim	770	(intConst \| floatConst)
147			;
148
149			protected
150			floatConst
151			:
152			FLOATONE \| FLOATTWO
153			;
154
155
156
157			class MDLexer extends Lexer;
158
159			options
160			{
161			k = 3;
162			exportVocab = MD;
163			testLiterals = false;
164			}
165
166			tokens {
167			DOT;
168			}
169
170			{
171
172
173			int deferredLineCount;
174			FilenameObserver* observer;
175
176			public:
177			void setObserver(FilenameObserver* osv) {observer = osv;}
178			void initDeferredLineCount() { deferredLineCount = 0;}
179			void deferredNewline() {
180			deferredLineCount++;
181			}
182
183
184			virtual void newline() {
185			for (;deferredLineCount>0;deferredLineCount--) {
186			CharScanner::newline();
187			}
188			CharScanner::newline();
189			}
190
191			}
192
193
194			// Operators:
195
196			ASSIGNEQUAL : '=' ;
197			COLON : ':' ;
198			COMMA : ',' ;
199			QUESTIONMARK : '?' ;
200			SEMICOLON : ';' ;
201
202			LPAREN : '(' ;
203			RPAREN : ')' ;
204			LBRACKET : '[' ;
205			RBRACKET : ']' ;
206			LCURLY : '{' ;
207			RCURLY : '}' ;
208
209
210			/*
211			EQUAL : "==" ;
212			NOTEQUAL : "!=" ;
213			LESSTHANOREQUALTO : "<=" ;
214			LESSTHAN : "<" ;
215			GREATERTHANOREQUALTO : ">=" ;
216			GREATERTHAN : ">" ;
217
218			DIVIDE : '/' ;
219			DIVIDEEQUAL : "/=" ;
220			PLUS : '+' ;
221			PLUSEQUAL : "+=" ;
222			PLUSPLUS : "++" ;
223			MINUS : '-' ;
224			MINUSEQUAL : "-=" ;
225			MINUSMINUS : "--" ;
226			STAR : '*' ;
227			TIMESEQUAL : "*=" ;
228			MOD : '%' ;
229			MODEQUAL : "%=" ;
230			SHIFTRIGHT : ">>" ;
231			SHIFTRIGHTEQUAL : ">>=" ;
232			SHIFTLEFT : "<<" ;
233			SHIFTLEFTEQUAL : "<<=" ;
234
235			AND : "&&" ;
236			NOT : '!' ;
237			OR : "\|\|" ;
238
239			AMPERSAND : '&' ;
240			BITWISEANDEQUAL : "&=" ;
241			TILDE : '~' ;
242			BITWISEOR : '\|' ;
243			BITWISEOREQUAL : "\|=" ;
244			BITWISEXOR : '^' ;
245			BITWISEXOREQUAL : "^=" ;
246			*/
247
248
249			Whitespace
250			:
251			( // whitespace ignored
252			(' ' \|'\t' \| '\f')
253			\| // handle newlines
254			( '\r' '\n' // MS
255			\| '\r' // Mac
256			\| '\n' // Unix
257			) { newline(); }
258			\| // handle continuation lines
259			( '\\' '\r' '\n' // MS
260			\| '\\' '\r' // Mac
261			\| '\\' '\n' // Unix
262			) {printf("CPP_parser.g continuation line detected\n");
263			deferredNewline();}
264			)
265			{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
266			;
267
268			Comment
269			:
270			"/*"
271			( {LA(2) != '/'}? '*'
272			\| EndOfLine {deferredNewline();}
273			\| ~('*'\| '\r' \| '\n')
274			)*
275			"*/" {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
276			;
277
278			CPPComment
279			:
280			"//" (~('\n' \| '\r'))* EndOfLine
281			{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
282			;
283
284			PREPROC_DIRECTIVE
285			options{paraphrase = "a line directive";}
286			:
287			'#' LineDirective
288			{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
289			;
290
291			protected
292			LineDirective
293			:
294			{
295			deferredLineCount = 0;
296			}
297			("line")? // this would be for if the directive started "#line"
298			(Space)+
299			n:Decimal { setLine(oopse::lexi_cast<int>(n->getText()) - 1); }
300			(Space)+
301			(sl:StringLiteral) {std::string filename = sl->getText().substr(1,sl->getText().length()-2); observer->notify(filename);}
302			((Space)+ Decimal)* // To support cpp flags (GNU)
303			EndOfLine
304			;
305
306			protected
307			Space
308			:
309			(' '\|'\t'\|'\f')
310			;
311
312
313			// Literals:
314
315			/*
316			* Note that we do NOT handle tri-graphs nor multi-byte sequences.
317			*/
318
319			/*
320			* Note that we can't have empty character constants (even though we
321			* can have empty strings :-).
322			*/
323			CharLiteral
324			:
325			'\'' (Escape \| ~('\'')) '\''
326			;
327
328			/*
329			* Can't have raw imbedded newlines in string constants. Strict reading of
330			* the standard gives odd dichotomy between newlines & carriage returns.
331			* Go figure.
332			*/
333			StringLiteral
334			:
335			'"'
336			( Escape
337			\|
338			( "\\\r\n" // MS
339			\| "\\\r" // MAC
340			\| "\\\n" // Unix
341			) {deferredNewline();}
342			\|
343			~('"'\|'\r'\|'\n'\|'\\')
344			)*
345			'"'
346			;
347
348			protected
349			EndOfLine
350			:
351			( options{generateAmbigWarnings = false;}:
352			"\r\n" // MS
353			\| '\r' // Mac
354			\| '\n' // Unix
355			)
356			;
357
358			/*
359			* Handle the various escape sequences.
360			*
361			* Note carefully that these numeric escape sequences are not of the
362			* same form as the C language numeric constants.
363			*
364			* There is no such thing as a binary numeric escape sequence.
365			*
366			* Octal escape sequences are either 1, 2, or 3 octal digits exactly.
367			*
368			* There is no such thing as a decimal escape sequence.
369			*
370			* Hexadecimal escape sequences are begun with a leading \x and continue
371			* until a non-hexadecimal character is found.
372			*
373			* No real handling of tri-graph sequences, yet.
374			*/
375
376			protected
377			Escape
378			:
379			'\\'
380			( options{warnWhenFollowAmbig=false;}:
381			'a'
382			\| 'b'
383			\| 'f'
384			\| 'n'
385			\| 'r'
386			\| 't'
387			\| 'v'
388			\| '"'
389			\| '\''
390			\| '\\'
391			\| '?'
392			\| ('0'..'3') (options{warnWhenFollowAmbig=false;}: Digit (options{warnWhenFollowAmbig=false;}: Digit)? )?
393			\| ('4'..'7') (options{warnWhenFollowAmbig=false;}: Digit)?
394			\| 'x' (options{warnWhenFollowAmbig=false;}: Digit \| 'a'..'f' \| 'A'..'F')+
395			)
396			;
397
398			// Numeric Constants:
399
400			protected
401			Digit
402			:
403			'0'..'9'
404			;
405
406			protected
407			Decimal
408			:
409			('0'..'9')+
410			;
411
412			protected
413			LongSuffix
414			: 'l'
415			\| 'L'
416			;
417
418			protected
419			UnsignedSuffix
420			: 'u'
421			\| 'U'
422			;
423
424			protected
425			FloatSuffix
426			: 'f'
427			\| 'F'
428			;
429
430			protected
431			Exponent
432			:
433			('e'\|'E'\|'d'\|'D') ('+'\|'-')? (Digit)+
434			;
435
436			protected
437			Vocabulary
438			:
439			'\3'..'\377'
440			;
441
442			Number
443	tim	810	:
444			('+'\|'-')?
445			(
446	tim	770	( (Digit)+ ('.' \| 'e' \| 'E' \| 'd' \| 'D' ) )=>
447			(Digit)+
448			( '.' (Digit)* (Exponent)? {_ttype = FLOATONE;} //Zuo 3/12/01
449			\| Exponent {_ttype = FLOATTWO;} //Zuo 3/12/01
450			) //{_ttype = DoubleDoubleConst;}
451			(FloatSuffix //{_ttype = FloatDoubleConst;}
452			\|LongSuffix //{_ttype = LongDoubleConst;}
453			)?
454			\|
455			'.' {_ttype = DOT;}
456			( (Digit)+ (Exponent)? {_ttype = FLOATONE;} //Zuo 3/12/01
457			//{_ttype = DoubleDoubleConst;}
458			(FloatSuffix //{_ttype = FloatDoubleConst;}
459			\|LongSuffix //{_ttype = LongDoubleConst;}
460			)?
461			)?
462			\|
463			'0' ('0'..'7')* //{_ttype = IntOctalConst;}
464			(LongSuffix //{_ttype = LongOctalConst;}
465			\|UnsignedSuffix //{_ttype = UnsignedOctalConst;}
466			)* {_ttype = OCTALINT;}
467			\|
468			'1'..'9' (Digit)* //{_ttype = IntIntConst;}
469			(LongSuffix //{_ttype = LongIntConst;}
470			\|UnsignedSuffix //{_ttype = UnsignedIntConst;}
471			)* {_ttype = DECIMALINT;}
472			\|
473			'0' ('x' \| 'X') ('a'..'f' \| 'A'..'F' \| Digit)+
474			//{_ttype = IntHexConst;}
475			(LongSuffix //{_ttype = LongHexConst;}
476			\|UnsignedSuffix //{_ttype = UnsignedHexConst;}
477			)* {_ttype = HEXADECIMALINT;}
478	tim	810	)
479	tim	770	;
480
481			ID
482			options {testLiterals = true;}
483			:
484			('a'..'z'\|'A'..'Z'\|'_')
485			('a'..'z'\|'A'..'Z'\|'_'\|'0'..'9')*
486			;