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:	2509
Committed:	Wed Dec 14 18:02:28 2005 UTC (18 years, 6 months ago) by tim
File size:	10735 byte(s)
Log Message:	fix a nasty negative integer parsing problem by refining the grammar
#	Content
1	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	signedNumber :
146	(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	:
444	('+'\|'-')?
445	(
446	( (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	)
479	;
480
481	ID
482	options {testLiterals = true;}
483	:
484	('a'..'z'\|'A'..'Z'\|'_')
485	('a'..'z'\|'A'..'Z'\|'_'\|'0'..'9')*
486	;