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";
  INVERSION   = "inversion";
  RIGIDBODY   = "rigidBody";
  CUTOFFGROUP = "cutoffGroup";
  FRAGMENT    = "fragment";
  MEMBERS     = "members";
  CENTER      = "center";
  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
                  | inversionblock
                  | 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!
              ;

inversionblock  : INVERSION^ (LBRACKET! intConst! RBRACKET!)?  LCURLY!(inversionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
          ;

inversionstatement  : assignment
              | CENTER^ LPAREN! intConst 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'|'d'|'D') ('+'|'-')? ('0'..'9')+
        ;

protected
FLOAT_SUFFIX
        :       'f'|'F'|'d'|'D'
        ;
Revision:	1277
Committed:	Mon Jul 14 12:35:58 2008 UTC (17 years, 3 months ago) by gezelter
File size:	10584 byte(s)
Log Message:	Changes for implementing Amber force field: Added Inversions and worked on BaseAtomTypes so that they'd function with the fortran side.
#	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	INVERSION = "inversion";
36	RIGIDBODY = "rigidBody";
37	CUTOFFGROUP = "cutoffGroup";
38	FRAGMENT = "fragment";
39	MEMBERS = "members";
40	CENTER = "center";
41	POSITION = "position";
42	ORIENTATION = "orientation";
43	ENDBLOCK;
44	}
45
46
47	mdfile : (statement)*
48	;
49
50	statement : assignment
51	\| componentblock
52	\| moleculeblock
53	\| zconstraintblock
54	;
55
56	assignment : ID ASSIGNEQUAL^ constant SEMICOLON!
57	;
58
59	constant : intConst
60	\| floatConst
61	\| ID
62	\| StringLiteral
63	;
64
65	componentblock : COMPONENT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
66	;
67
68	zconstraintblock : ZCONSTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
69	;
70
71	moleculeblock : MOLECULE^ LCURLY! (moleculestatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
72	;
73
74	moleculestatement : assignment
75	\| atomblock
76	\| bondblock
77	\| bendblock
78	\| torsionblock
79	\| inversionblock
80	\| rigidbodyblock
81	\| cutoffgroupblock
82	\| fragmentblock
83	;
84
85	atomblock : ATOM^ LBRACKET! intConst RBRACKET! LCURLY! (atomstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
86	;
87
88	atomstatement : assignment
89	\| POSITION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
90	\| ORIENTATION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
91	;
92
93
94	bondblock : BOND^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(bondstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
95	;
96
97	bondstatement : assignment
98	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
99	;
100
101	bendblock : BEND^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (bendstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
102	;
103
104	bendstatement : assignment
105	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
106	;
107
108	torsionblock : TORSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(torsionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
109	;
110
111	torsionstatement : assignment
112	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
113	;
114
115	inversionblock : INVERSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(inversionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
116	;
117
118	inversionstatement : assignment
119	\| CENTER^ LPAREN! intConst RPAREN! SEMICOLON!
120	;
121
122	rigidbodyblock : RIGIDBODY^ LBRACKET! intConst RBRACKET! LCURLY!(rigidbodystatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
123	;
124
125	rigidbodystatement : assignment
126	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
127	;
128
129	cutoffgroupblock : CUTOFFGROUP^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (cutoffgroupstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
130	;
131
132	cutoffgroupstatement : assignment
133	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
134	;
135
136	fragmentblock : FRAGMENT^ LBRACKET! intConst RBRACKET! LCURLY! (fragmentstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
137	;
138
139	fragmentstatement : assignment
140	;
141
142
143
144	doubleNumberTuple : doubleNumber (COMMA! doubleNumber)*
145	;
146
147	inttuple : intConst (COMMA! intConst)*
148	;
149
150	protected
151	intConst
152	: NUM_INT \| NUM_LONG
153	;
154
155	protected
156	doubleNumber :
157	(intConst \| floatConst)
158	;
159
160	protected
161	floatConst
162	:
163	NUM_FLOAT \| NUM_DOUBLE
164	;
165
166
167
168	class MDLexer extends Lexer;
169
170	options
171	{
172	k = 3;
173	exportVocab = MD;
174	testLiterals = false;
175	}
176
177	tokens {
178	DOT;
179	}
180
181	{
182
183
184	int deferredLineCount;
185	FilenameObserver* observer;
186
187	public:
188	void setObserver(FilenameObserver* osv) {observer = osv;}
189	void initDeferredLineCount() { deferredLineCount = 0;}
190	void deferredNewline() {
191	deferredLineCount++;
192	}
193
194
195	virtual void newline() {
196	for (;deferredLineCount>0;deferredLineCount--) {
197	CharScanner::newline();
198	}
199	CharScanner::newline();
200	}
201
202	}
203
204
205	// Operators:
206
207	ASSIGNEQUAL : '=' ;
208	COLON : ':' ;
209	COMMA : ',' ;
210	QUESTIONMARK : '?' ;
211	SEMICOLON : ';' ;
212
213	LPAREN : '(' ;
214	RPAREN : ')' ;
215	LBRACKET : '[' ;
216	RBRACKET : ']' ;
217	LCURLY : '{' ;
218	RCURLY : '}' ;
219
220	Whitespace
221	:
222	( // whitespace ignored
223	(' ' \|'\t' \| '\f')
224	\| // handle newlines
225	( '\r' '\n' // MS
226	\| '\r' // Mac
227	\| '\n' // Unix
228	) { newline(); }
229	\| // handle continuation lines
230	( '\\' '\r' '\n' // MS
231	\| '\\' '\r' // Mac
232	\| '\\' '\n' // Unix
233	) {printf("CPP_parser.g continuation line detected\n");
234	deferredNewline();}
235	)
236	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
237	;
238
239	Comment
240	:
241	"/*"
242	( {LA(2) != '/'}? '*'
243	\| EndOfLine {deferredNewline();}
244	\| ~('*'\| '\r' \| '\n')
245	)*
246	"*/" {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
247	;
248
249	CPPComment
250	:
251	"//" (~('\n' \| '\r'))* EndOfLine
252	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
253	;
254
255	PREPROC_DIRECTIVE
256	options{paraphrase = "a line directive";}
257	:
258	'#' LineDirective
259	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
260	;
261
262	protected
263	LineDirective
264	:
265	{
266	deferredLineCount = 0;
267	}
268	("line")? // this would be for if the directive started "#line"
269	(Space)+
270	n:Decimal { setLine(oopse::lexi_cast<int>(n->getText()) - 1); }
271	(Space)+
272	(sl:StringLiteral) {std::string filename = sl->getText().substr(1,sl->getText().length()-2); observer->notify(filename);}
273	((Space)+ Decimal)* // To support cpp flags (GNU)
274	EndOfLine
275	;
276
277	protected
278	Space
279	:
280	(' '\|'\t'\|'\f')
281	;
282
283
284	// Literals:
285
286	/*
287	* Note that we do NOT handle tri-graphs nor multi-byte sequences.
288	*/
289
290	/*
291	* Note that we can't have empty character constants (even though we
292	* can have empty strings :-).
293	*/
294	CharLiteral
295	:
296	'\'' (Escape \| ~('\'')) '\''
297	;
298
299	/*
300	* Can't have raw imbedded newlines in string constants. Strict reading of
301	* the standard gives odd dichotomy between newlines & carriage returns.
302	* Go figure.
303	*/
304	StringLiteral
305	:
306	'"'
307	( Escape
308	\|
309	( "\\\r\n" // MS
310	\| "\\\r" // MAC
311	\| "\\\n" // Unix
312	) {deferredNewline();}
313	\|
314	~('"'\|'\r'\|'\n'\|'\\')
315	)*
316	'"'
317	;
318
319	protected
320	EndOfLine
321	:
322	( options{generateAmbigWarnings = false;}:
323	"\r\n" // MS
324	\| '\r' // Mac
325	\| '\n' // Unix
326	)
327	;
328
329	/*
330	* Handle the various escape sequences.
331	*
332	* Note carefully that these numeric escape sequences are not of the
333	* same form as the C language numeric constants.
334	*
335	* There is no such thing as a binary numeric escape sequence.
336	*
337	* Octal escape sequences are either 1, 2, or 3 octal digits exactly.
338	*
339	* There is no such thing as a decimal escape sequence.
340	*
341	* Hexadecimal escape sequences are begun with a leading \x and continue
342	* until a non-hexadecimal character is found.
343	*
344	* No real handling of tri-graph sequences, yet.
345	*/
346
347	protected
348	Escape
349	:
350	'\\'
351	( options{warnWhenFollowAmbig=false;}:
352	'a'
353	\| 'b'
354	\| 'f'
355	\| 'n'
356	\| 'r'
357	\| 't'
358	\| 'v'
359	\| '"'
360	\| '\''
361	\| '\\'
362	\| '?'
363	\| ('0'..'3') (options{warnWhenFollowAmbig=false;}: Digit (options{warnWhenFollowAmbig=false;}: Digit)? )?
364	\| ('4'..'7') (options{warnWhenFollowAmbig=false;}: Digit)?
365	\| 'x' (options{warnWhenFollowAmbig=false;}: Digit \| 'a'..'f' \| 'A'..'F')+
366	)
367	;
368
369
370	protected
371	Vocabulary
372	:
373	'\3'..'\377'
374	;
375
376
377	ID
378	options {testLiterals = true;}
379	:
380	('a'..'z'\|'A'..'Z'\|'_')
381	('a'..'z'\|'A'..'Z'\|'_'\|'0'..'9')*
382	;
383
384
385	protected
386	Digit
387	:
388	'0'..'9'
389	;
390
391	protected
392	Decimal
393	:
394	('0'..'9')+
395	;
396
397	// hexadecimal digit (again, note it's protected!)
398	protected
399	HEX_DIGIT
400	: ('0'..'9'\|'A'..'F'\|'a'..'f')
401	;
402
403
404	// a numeric literal
405	NUM_INT
406	{
407	bool isDecimal = false;
408	ANTLR_USE_NAMESPACE(antlr)RefToken t = ANTLR_USE_NAMESPACE(antlr)nullToken;
409	}
410	: ('+' \| '-')?
411	(
412	'.' {_ttype = DOT;}
413	( ('0'..'9')+ (EXPONENT)? (f1:FLOAT_SUFFIX {t=f1;})?
414	{
415	if ( t &&
416	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
417	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
418	_ttype = NUM_FLOAT;
419	}
420	else {
421	_ttype = NUM_DOUBLE; // assume double
422	}
423	}
424	)?
425
426	\| ( '0' {isDecimal = true;} // special case for just '0'
427	( ('x'\|'X')
428	( // hex
429	// the 'e'\|'E' and float suffix stuff look
430	// like hex digits, hence the (...)+ doesn't
431	// know when to stop: ambig. ANTLR resolves
432	// it correctly by matching immediately. It
433	// is therefor ok to hush warning.
434	options {
435	warnWhenFollowAmbig=false;
436	}
437	: HEX_DIGIT
438	)+
439	\| //float or double with leading zero
440	(('0'..'9')+ ('.'\|EXPONENT\|FLOAT_SUFFIX)) => ('0'..'9')+
441	\| ('0'..'7')+ // octal
442	)?
443	\| ('1'..'9') ('0'..'9')* {isDecimal=true;} // non-zero decimal
444	)
445	( ('l'\|'L') { _ttype = NUM_LONG; }
446
447	// only check to see if it's a float if looks like decimal so far
448	\| {isDecimal}?
449	( '.' ('0'..'9')* (EXPONENT)? (f2:FLOAT_SUFFIX {t=f2;})?
450	\| EXPONENT (f3:FLOAT_SUFFIX {t=f3;})?
451	\| f4:FLOAT_SUFFIX {t=f4;}
452	)
453	{
454	if ( t &&
455	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
456	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
457	_ttype = NUM_FLOAT;
458	}
459	else {
460	_ttype = NUM_DOUBLE; // assume double
461	}
462	}
463	)?
464	)
465	;
466
467	// a couple protected methods to assist in matching floating point numbers
468	protected
469	EXPONENT
470	: ('e'\|'E'\|'d'\|'D') ('+'\|'-')? ('0'..'9')+
471	;
472
473	protected
474	FLOAT_SUFFIX
475	: 'f'\|'F'\|'d'\|'D'
476	;