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
                  | 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:	1275
Committed:	Fri Jul 4 20:54:29 2008 UTC (16 years, 10 months ago) by cli2
Original Path:	*trunk/src/mdParser/MDParser.g*
File size:	10549 byte(s)
Log Message:	Changes required for Inversions and Base Atom types. This will break OOPSE badly for a few days or so...
#	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	\| rigidbodyblock
80	\| cutoffgroupblock
81	\| fragmentblock
82	;
83
84	atomblock : ATOM^ LBRACKET! intConst RBRACKET! LCURLY! (atomstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
85	;
86
87	atomstatement : assignment
88	\| POSITION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
89	\| ORIENTATION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
90	;
91
92
93	bondblock : BOND^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(bondstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
94	;
95
96	bondstatement : assignment
97	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
98	;
99
100	bendblock : BEND^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (bendstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
101	;
102
103	bendstatement : assignment
104	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
105	;
106
107	torsionblock : TORSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(torsionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
108	;
109
110	torsionstatement : assignment
111	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
112	;
113
114	inversionblock : INVERSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(inversionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
115	;
116
117	inversionstatement : assignment
118	\| CENTER^ LPAREN! intConst RPAREN! SEMICOLON!
119	;
120
121	rigidbodyblock : RIGIDBODY^ LBRACKET! intConst RBRACKET! LCURLY!(rigidbodystatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
122	;
123
124	rigidbodystatement : assignment
125	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
126	;
127
128	cutoffgroupblock : CUTOFFGROUP^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (cutoffgroupstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
129	;
130
131	cutoffgroupstatement : assignment
132	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
133	;
134
135	fragmentblock : FRAGMENT^ LBRACKET! intConst RBRACKET! LCURLY! (fragmentstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
136	;
137
138	fragmentstatement : assignment
139	;
140
141
142
143	doubleNumberTuple : doubleNumber (COMMA! doubleNumber)*
144	;
145
146	inttuple : intConst (COMMA! intConst)*
147	;
148
149	protected
150	intConst
151	: NUM_INT \| NUM_LONG
152	;
153
154	protected
155	doubleNumber :
156	(intConst \| floatConst)
157	;
158
159	protected
160	floatConst
161	:
162	NUM_FLOAT \| NUM_DOUBLE
163	;
164
165
166
167	class MDLexer extends Lexer;
168
169	options
170	{
171	k = 3;
172	exportVocab = MD;
173	testLiterals = false;
174	}
175
176	tokens {
177	DOT;
178	}
179
180	{
181
182
183	int deferredLineCount;
184	FilenameObserver* observer;
185
186	public:
187	void setObserver(FilenameObserver* osv) {observer = osv;}
188	void initDeferredLineCount() { deferredLineCount = 0;}
189	void deferredNewline() {
190	deferredLineCount++;
191	}
192
193
194	virtual void newline() {
195	for (;deferredLineCount>0;deferredLineCount--) {
196	CharScanner::newline();
197	}
198	CharScanner::newline();
199	}
200
201	}
202
203
204	// Operators:
205
206	ASSIGNEQUAL : '=' ;
207	COLON : ':' ;
208	COMMA : ',' ;
209	QUESTIONMARK : '?' ;
210	SEMICOLON : ';' ;
211
212	LPAREN : '(' ;
213	RPAREN : ')' ;
214	LBRACKET : '[' ;
215	RBRACKET : ']' ;
216	LCURLY : '{' ;
217	RCURLY : '}' ;
218
219	Whitespace
220	:
221	( // whitespace ignored
222	(' ' \|'\t' \| '\f')
223	\| // handle newlines
224	( '\r' '\n' // MS
225	\| '\r' // Mac
226	\| '\n' // Unix
227	) { newline(); }
228	\| // handle continuation lines
229	( '\\' '\r' '\n' // MS
230	\| '\\' '\r' // Mac
231	\| '\\' '\n' // Unix
232	) {printf("CPP_parser.g continuation line detected\n");
233	deferredNewline();}
234	)
235	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
236	;
237
238	Comment
239	:
240	"/*"
241	( {LA(2) != '/'}? '*'
242	\| EndOfLine {deferredNewline();}
243	\| ~('*'\| '\r' \| '\n')
244	)*
245	"*/" {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
246	;
247
248	CPPComment
249	:
250	"//" (~('\n' \| '\r'))* EndOfLine
251	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
252	;
253
254	PREPROC_DIRECTIVE
255	options{paraphrase = "a line directive";}
256	:
257	'#' LineDirective
258	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
259	;
260
261	protected
262	LineDirective
263	:
264	{
265	deferredLineCount = 0;
266	}
267	("line")? // this would be for if the directive started "#line"
268	(Space)+
269	n:Decimal { setLine(oopse::lexi_cast<int>(n->getText()) - 1); }
270	(Space)+
271	(sl:StringLiteral) {std::string filename = sl->getText().substr(1,sl->getText().length()-2); observer->notify(filename);}
272	((Space)+ Decimal)* // To support cpp flags (GNU)
273	EndOfLine
274	;
275
276	protected
277	Space
278	:
279	(' '\|'\t'\|'\f')
280	;
281
282
283	// Literals:
284
285	/*
286	* Note that we do NOT handle tri-graphs nor multi-byte sequences.
287	*/
288
289	/*
290	* Note that we can't have empty character constants (even though we
291	* can have empty strings :-).
292	*/
293	CharLiteral
294	:
295	'\'' (Escape \| ~('\'')) '\''
296	;
297
298	/*
299	* Can't have raw imbedded newlines in string constants. Strict reading of
300	* the standard gives odd dichotomy between newlines & carriage returns.
301	* Go figure.
302	*/
303	StringLiteral
304	:
305	'"'
306	( Escape
307	\|
308	( "\\\r\n" // MS
309	\| "\\\r" // MAC
310	\| "\\\n" // Unix
311	) {deferredNewline();}
312	\|
313	~('"'\|'\r'\|'\n'\|'\\')
314	)*
315	'"'
316	;
317
318	protected
319	EndOfLine
320	:
321	( options{generateAmbigWarnings = false;}:
322	"\r\n" // MS
323	\| '\r' // Mac
324	\| '\n' // Unix
325	)
326	;
327
328	/*
329	* Handle the various escape sequences.
330	*
331	* Note carefully that these numeric escape sequences are not of the
332	* same form as the C language numeric constants.
333	*
334	* There is no such thing as a binary numeric escape sequence.
335	*
336	* Octal escape sequences are either 1, 2, or 3 octal digits exactly.
337	*
338	* There is no such thing as a decimal escape sequence.
339	*
340	* Hexadecimal escape sequences are begun with a leading \x and continue
341	* until a non-hexadecimal character is found.
342	*
343	* No real handling of tri-graph sequences, yet.
344	*/
345
346	protected
347	Escape
348	:
349	'\\'
350	( options{warnWhenFollowAmbig=false;}:
351	'a'
352	\| 'b'
353	\| 'f'
354	\| 'n'
355	\| 'r'
356	\| 't'
357	\| 'v'
358	\| '"'
359	\| '\''
360	\| '\\'
361	\| '?'
362	\| ('0'..'3') (options{warnWhenFollowAmbig=false;}: Digit (options{warnWhenFollowAmbig=false;}: Digit)? )?
363	\| ('4'..'7') (options{warnWhenFollowAmbig=false;}: Digit)?
364	\| 'x' (options{warnWhenFollowAmbig=false;}: Digit \| 'a'..'f' \| 'A'..'F')+
365	)
366	;
367
368
369	protected
370	Vocabulary
371	:
372	'\3'..'\377'
373	;
374
375
376	ID
377	options {testLiterals = true;}
378	:
379	('a'..'z'\|'A'..'Z'\|'_')
380	('a'..'z'\|'A'..'Z'\|'_'\|'0'..'9')*
381	;
382
383
384	protected
385	Digit
386	:
387	'0'..'9'
388	;
389
390	protected
391	Decimal
392	:
393	('0'..'9')+
394	;
395
396	// hexadecimal digit (again, note it's protected!)
397	protected
398	HEX_DIGIT
399	: ('0'..'9'\|'A'..'F'\|'a'..'f')
400	;
401
402
403	// a numeric literal
404	NUM_INT
405	{
406	bool isDecimal = false;
407	ANTLR_USE_NAMESPACE(antlr)RefToken t = ANTLR_USE_NAMESPACE(antlr)nullToken;
408	}
409	: ('+' \| '-')?
410	(
411	'.' {_ttype = DOT;}
412	( ('0'..'9')+ (EXPONENT)? (f1:FLOAT_SUFFIX {t=f1;})?
413	{
414	if ( t &&
415	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
416	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
417	_ttype = NUM_FLOAT;
418	}
419	else {
420	_ttype = NUM_DOUBLE; // assume double
421	}
422	}
423	)?
424
425	\| ( '0' {isDecimal = true;} // special case for just '0'
426	( ('x'\|'X')
427	( // hex
428	// the 'e'\|'E' and float suffix stuff look
429	// like hex digits, hence the (...)+ doesn't
430	// know when to stop: ambig. ANTLR resolves
431	// it correctly by matching immediately. It
432	// is therefor ok to hush warning.
433	options {
434	warnWhenFollowAmbig=false;
435	}
436	: HEX_DIGIT
437	)+
438	\| //float or double with leading zero
439	(('0'..'9')+ ('.'\|EXPONENT\|FLOAT_SUFFIX)) => ('0'..'9')+
440	\| ('0'..'7')+ // octal
441	)?
442	\| ('1'..'9') ('0'..'9')* {isDecimal=true;} // non-zero decimal
443	)
444	( ('l'\|'L') { _ttype = NUM_LONG; }
445
446	// only check to see if it's a float if looks like decimal so far
447	\| {isDecimal}?
448	( '.' ('0'..'9')* (EXPONENT)? (f2:FLOAT_SUFFIX {t=f2;})?
449	\| EXPONENT (f3:FLOAT_SUFFIX {t=f3;})?
450	\| f4:FLOAT_SUFFIX {t=f4;}
451	)
452	{
453	if ( t &&
454	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
455	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
456	_ttype = NUM_FLOAT;
457	}
458	else {
459	_ttype = NUM_DOUBLE; // assume double
460	}
461	}
462	)?
463	)
464	;
465
466	// a couple protected methods to assist in matching floating point numbers
467	protected
468	EXPONENT
469	: ('e'\|'E'\|'d'\|'D') ('+'\|'-')? ('0'..'9')+
470	;
471
472	protected
473	FLOAT_SUFFIX
474	: 'f'\|'F'\|'d'\|'D'
475	;