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    : intConst
                                                | floatConst
            | 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! doubleNumberTuple RPAREN! SEMICOLON!
              | ORIENTATION^  LPAREN! doubleNumberTuple 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
              ;


doubleNumberTuple   : doubleNumber (COMMA! doubleNumber)* 
              ;
                          
inttuple      : intConst (COMMA! intConst)*
              ;
              
protected
intConst
        :  NUM_INT | NUM_LONG
        ;

protected
doubleNumber  :  
                (intConst | floatConst)
              ;
              
protected
floatConst
        : 
          NUM_FLOAT | NUM_DOUBLE
        ;


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          : '}' ;

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')+
    )
  ;


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


ID
  options {testLiterals = true;}
  : 
    ('a'..'z'|'A'..'Z'|'_')
    ('a'..'z'|'A'..'Z'|'_'|'0'..'9')*
  ;


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

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

// hexadecimal digit (again, note it's protected!)
protected
HEX_DIGIT
        :       ('0'..'9'|'A'..'F'|'a'..'f')
        ;


// a numeric literal
NUM_INT
        {
                bool isDecimal = false;
                ANTLR_USE_NAMESPACE(antlr)RefToken t = ANTLR_USE_NAMESPACE(antlr)nullToken;
        }
    : ('+' | '-')?
    (
      '.' {_ttype = DOT;}
            (   ('0'..'9')+ (EXPONENT)? (f1:FLOAT_SUFFIX {t=f1;})?
            {
                                        if ( t &&
                                                  (t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos ||
                                                        t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
                                                _ttype = NUM_FLOAT;
                                        }
                                        else {
                                                _ttype = NUM_DOUBLE; // assume double
                                        }
                                }
            )?

        |       (       '0' {isDecimal = true;} // special case for just '0'
                        (       ('x'|'X')
                                (                                                                                       // hex
                                        // the 'e'|'E' and float suffix stuff look
                                        // like hex digits, hence the (...)+ doesn't
                                        // know when to stop: ambig.  ANTLR resolves
                                        // it correctly by matching immediately.  It
                                        // is therefor ok to hush warning.
                                        options {
                                                warnWhenFollowAmbig=false;
                                        }
                                :       HEX_DIGIT
                                )+
                        |       //float or double with leading zero
                                (('0'..'9')+ ('.'|EXPONENT|FLOAT_SUFFIX)) => ('0'..'9')+
                        |       ('0'..'7')+                                                                     // octal
                        )?
                |       ('1'..'9') ('0'..'9')*  {isDecimal=true;}               // non-zero decimal
                )
                (       ('l'|'L') { _ttype = NUM_LONG; }

                // only check to see if it's a float if looks like decimal so far
                |       {isDecimal}?
            (   '.' ('0'..'9')* (EXPONENT)? (f2:FLOAT_SUFFIX {t=f2;})?
            |   EXPONENT (f3:FLOAT_SUFFIX {t=f3;})?
            |   f4:FLOAT_SUFFIX {t=f4;}
            )
            {
                                        if ( t &&
                                                  (t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos ||
                                                        t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
                                                _ttype = NUM_FLOAT;
                                        }
                                        else {
                                                _ttype = NUM_DOUBLE; // assume double
                                        }
                                }
        )?
  )
        ;

// a couple protected methods to assist in matching floating point numbers
protected
EXPONENT
        :       ('e'|'E') ('+'|'-')? ('0'..'9')+
        ;

protected
FLOAT_SUFFIX
        :       'f'|'F'|'d'|'D'
        ;
Revision:	814
Committed:	Fri Dec 16 02:57:00 2005 UTC (19 years, 4 months ago) by tim
File size:	10234 byte(s)
Log Message:	replace grammar for numerical parsing
#	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 : intConst
58	\| floatConst
59	\| ID
60	\| StringLiteral
61	;
62
63	componentblock : COMPONENT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
64	;
65
66	zconstraintblock : ZCONSTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
67	;
68
69	moleculeblock : MOLECULE^ LCURLY! (moleculestatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
70	;
71
72	moleculestatement : assignment
73	\| atomblock
74	\| bondblock
75	\| bendblock
76	\| torsionblock
77	\| rigidbodyblock
78	\| cutoffgroupblock
79	\| fragmentblock
80	;
81
82	atomblock : ATOM^ LBRACKET! intConst RBRACKET! LCURLY! (atomstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
83	;
84
85	atomstatement : assignment
86	\| POSITION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
87	\| ORIENTATION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
88	;
89
90
91	bondblock : BOND^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(bondstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
92	;
93
94	bondstatement : assignment
95	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
96	;
97
98	bendblock : BEND^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (bendstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
99	;
100
101	bendstatement : assignment
102	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
103	;
104
105	torsionblock : TORSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(torsionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
106	;
107
108	torsionstatement : assignment
109	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
110	;
111
112	rigidbodyblock : RIGIDBODY^ LBRACKET! intConst RBRACKET! LCURLY!(rigidbodystatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
113	;
114
115	rigidbodystatement : assignment
116	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
117	;
118
119	cutoffgroupblock : CUTOFFGROUP^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (cutoffgroupstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
120	;
121
122	cutoffgroupstatement : assignment
123	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
124	;
125
126	fragmentblock : FRAGMENT^ LBRACKET! intConst RBRACKET! LCURLY! (fragmentstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
127	;
128
129	fragmentstatement : assignment
130	;
131
132
133
134	doubleNumberTuple : doubleNumber (COMMA! doubleNumber)*
135	;
136
137	inttuple : intConst (COMMA! intConst)*
138	;
139
140	protected
141	intConst
142	: NUM_INT \| NUM_LONG
143	;
144
145	protected
146	doubleNumber :
147	(intConst \| floatConst)
148	;
149
150	protected
151	floatConst
152	:
153	NUM_FLOAT \| NUM_DOUBLE
154	;
155
156
157
158	class MDLexer extends Lexer;
159
160	options
161	{
162	k = 3;
163	exportVocab = MD;
164	testLiterals = false;
165	}
166
167	tokens {
168	DOT;
169	}
170
171	{
172
173
174	int deferredLineCount;
175	FilenameObserver* observer;
176
177	public:
178	void setObserver(FilenameObserver* osv) {observer = osv;}
179	void initDeferredLineCount() { deferredLineCount = 0;}
180	void deferredNewline() {
181	deferredLineCount++;
182	}
183
184
185	virtual void newline() {
186	for (;deferredLineCount>0;deferredLineCount--) {
187	CharScanner::newline();
188	}
189	CharScanner::newline();
190	}
191
192	}
193
194
195	// Operators:
196
197	ASSIGNEQUAL : '=' ;
198	COLON : ':' ;
199	COMMA : ',' ;
200	QUESTIONMARK : '?' ;
201	SEMICOLON : ';' ;
202
203	LPAREN : '(' ;
204	RPAREN : ')' ;
205	LBRACKET : '[' ;
206	RBRACKET : ']' ;
207	LCURLY : '{' ;
208	RCURLY : '}' ;
209
210	Whitespace
211	:
212	( // whitespace ignored
213	(' ' \|'\t' \| '\f')
214	\| // handle newlines
215	( '\r' '\n' // MS
216	\| '\r' // Mac
217	\| '\n' // Unix
218	) { newline(); }
219	\| // handle continuation lines
220	( '\\' '\r' '\n' // MS
221	\| '\\' '\r' // Mac
222	\| '\\' '\n' // Unix
223	) {printf("CPP_parser.g continuation line detected\n");
224	deferredNewline();}
225	)
226	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
227	;
228
229	Comment
230	:
231	"/*"
232	( {LA(2) != '/'}? '*'
233	\| EndOfLine {deferredNewline();}
234	\| ~('*'\| '\r' \| '\n')
235	)*
236	"*/" {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
237	;
238
239	CPPComment
240	:
241	"//" (~('\n' \| '\r'))* EndOfLine
242	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
243	;
244
245	PREPROC_DIRECTIVE
246	options{paraphrase = "a line directive";}
247	:
248	'#' LineDirective
249	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
250	;
251
252	protected
253	LineDirective
254	:
255	{
256	deferredLineCount = 0;
257	}
258	("line")? // this would be for if the directive started "#line"
259	(Space)+
260	n:Decimal { setLine(oopse::lexi_cast<int>(n->getText()) - 1); }
261	(Space)+
262	(sl:StringLiteral) {std::string filename = sl->getText().substr(1,sl->getText().length()-2); observer->notify(filename);}
263	((Space)+ Decimal)* // To support cpp flags (GNU)
264	EndOfLine
265	;
266
267	protected
268	Space
269	:
270	(' '\|'\t'\|'\f')
271	;
272
273
274	// Literals:
275
276	/*
277	* Note that we do NOT handle tri-graphs nor multi-byte sequences.
278	*/
279
280	/*
281	* Note that we can't have empty character constants (even though we
282	* can have empty strings :-).
283	*/
284	CharLiteral
285	:
286	'\'' (Escape \| ~('\'')) '\''
287	;
288
289	/*
290	* Can't have raw imbedded newlines in string constants. Strict reading of
291	* the standard gives odd dichotomy between newlines & carriage returns.
292	* Go figure.
293	*/
294	StringLiteral
295	:
296	'"'
297	( Escape
298	\|
299	( "\\\r\n" // MS
300	\| "\\\r" // MAC
301	\| "\\\n" // Unix
302	) {deferredNewline();}
303	\|
304	~('"'\|'\r'\|'\n'\|'\\')
305	)*
306	'"'
307	;
308
309	protected
310	EndOfLine
311	:
312	( options{generateAmbigWarnings = false;}:
313	"\r\n" // MS
314	\| '\r' // Mac
315	\| '\n' // Unix
316	)
317	;
318
319	/*
320	* Handle the various escape sequences.
321	*
322	* Note carefully that these numeric escape sequences are not of the
323	* same form as the C language numeric constants.
324	*
325	* There is no such thing as a binary numeric escape sequence.
326	*
327	* Octal escape sequences are either 1, 2, or 3 octal digits exactly.
328	*
329	* There is no such thing as a decimal escape sequence.
330	*
331	* Hexadecimal escape sequences are begun with a leading \x and continue
332	* until a non-hexadecimal character is found.
333	*
334	* No real handling of tri-graph sequences, yet.
335	*/
336
337	protected
338	Escape
339	:
340	'\\'
341	( options{warnWhenFollowAmbig=false;}:
342	'a'
343	\| 'b'
344	\| 'f'
345	\| 'n'
346	\| 'r'
347	\| 't'
348	\| 'v'
349	\| '"'
350	\| '\''
351	\| '\\'
352	\| '?'
353	\| ('0'..'3') (options{warnWhenFollowAmbig=false;}: Digit (options{warnWhenFollowAmbig=false;}: Digit)? )?
354	\| ('4'..'7') (options{warnWhenFollowAmbig=false;}: Digit)?
355	\| 'x' (options{warnWhenFollowAmbig=false;}: Digit \| 'a'..'f' \| 'A'..'F')+
356	)
357	;
358
359
360	protected
361	Vocabulary
362	:
363	'\3'..'\377'
364	;
365
366
367	ID
368	options {testLiterals = true;}
369	:
370	('a'..'z'\|'A'..'Z'\|'_')
371	('a'..'z'\|'A'..'Z'\|'_'\|'0'..'9')*
372	;
373
374
375	protected
376	Digit
377	:
378	'0'..'9'
379	;
380
381	protected
382	Decimal
383	:
384	('0'..'9')+
385	;
386
387	// hexadecimal digit (again, note it's protected!)
388	protected
389	HEX_DIGIT
390	: ('0'..'9'\|'A'..'F'\|'a'..'f')
391	;
392
393
394	// a numeric literal
395	NUM_INT
396	{
397	bool isDecimal = false;
398	ANTLR_USE_NAMESPACE(antlr)RefToken t = ANTLR_USE_NAMESPACE(antlr)nullToken;
399	}
400	: ('+' \| '-')?
401	(
402	'.' {_ttype = DOT;}
403	( ('0'..'9')+ (EXPONENT)? (f1:FLOAT_SUFFIX {t=f1;})?
404	{
405	if ( t &&
406	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
407	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
408	_ttype = NUM_FLOAT;
409	}
410	else {
411	_ttype = NUM_DOUBLE; // assume double
412	}
413	}
414	)?
415
416	\| ( '0' {isDecimal = true;} // special case for just '0'
417	( ('x'\|'X')
418	( // hex
419	// the 'e'\|'E' and float suffix stuff look
420	// like hex digits, hence the (...)+ doesn't
421	// know when to stop: ambig. ANTLR resolves
422	// it correctly by matching immediately. It
423	// is therefor ok to hush warning.
424	options {
425	warnWhenFollowAmbig=false;
426	}
427	: HEX_DIGIT
428	)+
429	\| //float or double with leading zero
430	(('0'..'9')+ ('.'\|EXPONENT\|FLOAT_SUFFIX)) => ('0'..'9')+
431	\| ('0'..'7')+ // octal
432	)?
433	\| ('1'..'9') ('0'..'9')* {isDecimal=true;} // non-zero decimal
434	)
435	( ('l'\|'L') { _ttype = NUM_LONG; }
436
437	// only check to see if it's a float if looks like decimal so far
438	\| {isDecimal}?
439	( '.' ('0'..'9')* (EXPONENT)? (f2:FLOAT_SUFFIX {t=f2;})?
440	\| EXPONENT (f3:FLOAT_SUFFIX {t=f3;})?
441	\| f4:FLOAT_SUFFIX {t=f4;}
442	)
443	{
444	if ( t &&
445	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
446	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
447	_ttype = NUM_FLOAT;
448	}
449	else {
450	_ttype = NUM_DOUBLE; // assume double
451	}
452	}
453	)?
454	)
455	;
456
457	// a couple protected methods to assist in matching floating point numbers
458	protected
459	EXPONENT
460	: ('e'\|'E') ('+'\|'-')? ('0'..'9')+
461	;
462
463	protected
464	FLOAT_SUFFIX
465	: 'f'\|'F'\|'d'\|'D'
466	;