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";
  RESTRAINT   = "restraint";
  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
          | restraintblock
          ;
            
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);}
                  ;

restraintblock  : RESTRAINT^ 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(OpenMD::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:	1465
Committed:	Fri Jul 9 23:08:25 2010 UTC (14 years, 10 months ago) by chuckv
File size:	10750 byte(s)
Log Message:	Creating busticated version of OpenMD
#	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	RESTRAINT = "restraint";
32	ATOM = "atom";
33	BOND = "bond";
34	BEND = "bend";
35	TORSION = "torsion";
36	INVERSION = "inversion";
37	RIGIDBODY = "rigidBody";
38	CUTOFFGROUP = "cutoffGroup";
39	FRAGMENT = "fragment";
40	MEMBERS = "members";
41	CENTER = "center";
42	POSITION = "position";
43	ORIENTATION = "orientation";
44	ENDBLOCK;
45	}
46
47
48	mdfile : (statement)*
49	;
50
51	statement : assignment
52	\| componentblock
53	\| moleculeblock
54	\| zconstraintblock
55	\| restraintblock
56	;
57
58	assignment : ID ASSIGNEQUAL^ constant SEMICOLON!
59	;
60
61	constant : intConst
62	\| floatConst
63	\| ID
64	\| StringLiteral
65	;
66
67	componentblock : COMPONENT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
68	;
69
70	zconstraintblock : ZCONSTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
71	;
72
73	restraintblock : RESTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
74	;
75
76	moleculeblock : MOLECULE^ LCURLY! (moleculestatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
77	;
78
79	moleculestatement : assignment
80	\| atomblock
81	\| bondblock
82	\| bendblock
83	\| torsionblock
84	\| inversionblock
85	\| rigidbodyblock
86	\| cutoffgroupblock
87	\| fragmentblock
88	;
89
90	atomblock : ATOM^ LBRACKET! intConst RBRACKET! LCURLY! (atomstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
91	;
92
93	atomstatement : assignment
94	\| POSITION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
95	\| ORIENTATION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
96	;
97
98
99	bondblock : BOND^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(bondstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
100	;
101
102	bondstatement : assignment
103	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
104	;
105
106	bendblock : BEND^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (bendstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
107	;
108
109	bendstatement : assignment
110	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
111	;
112
113	torsionblock : TORSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(torsionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
114	;
115
116	torsionstatement : assignment
117	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
118	;
119
120	inversionblock : INVERSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(inversionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
121	;
122
123	inversionstatement : assignment
124	\| CENTER^ LPAREN! intConst RPAREN! SEMICOLON!
125	;
126
127	rigidbodyblock : RIGIDBODY^ LBRACKET! intConst RBRACKET! LCURLY!(rigidbodystatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
128	;
129
130	rigidbodystatement : assignment
131	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
132	;
133
134	cutoffgroupblock : CUTOFFGROUP^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (cutoffgroupstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
135	;
136
137	cutoffgroupstatement : assignment
138	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
139	;
140
141	fragmentblock : FRAGMENT^ LBRACKET! intConst RBRACKET! LCURLY! (fragmentstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
142	;
143
144	fragmentstatement : assignment
145	;
146
147
148
149	doubleNumberTuple : doubleNumber (COMMA! doubleNumber)*
150	;
151
152	inttuple : intConst (COMMA! intConst)*
153	;
154
155	protected
156	intConst
157	: NUM_INT \| NUM_LONG
158	;
159
160	protected
161	doubleNumber :
162	(intConst \| floatConst)
163	;
164
165	protected
166	floatConst
167	:
168	NUM_FLOAT \| NUM_DOUBLE
169	;
170
171
172
173	class MDLexer extends Lexer;
174
175	options
176	{
177	k = 3;
178	exportVocab = MD;
179	testLiterals = false;
180	}
181
182	tokens {
183	DOT;
184	}
185
186	{
187
188
189	int deferredLineCount;
190	FilenameObserver* observer;
191
192	public:
193	void setObserver(FilenameObserver* osv) {observer = osv;}
194	void initDeferredLineCount() { deferredLineCount = 0;}
195	void deferredNewline() {
196	deferredLineCount++;
197	}
198
199
200	virtual void newline() {
201	for (;deferredLineCount>0;deferredLineCount--) {
202	CharScanner::newline();
203	}
204	CharScanner::newline();
205	}
206
207	}
208
209
210	// Operators:
211
212	ASSIGNEQUAL : '=' ;
213	COLON : ':' ;
214	COMMA : ',' ;
215	QUESTIONMARK : '?' ;
216	SEMICOLON : ';' ;
217
218	LPAREN : '(' ;
219	RPAREN : ')' ;
220	LBRACKET : '[' ;
221	RBRACKET : ']' ;
222	LCURLY : '{' ;
223	RCURLY : '}' ;
224
225	Whitespace
226	:
227	( // whitespace ignored
228	(' ' \|'\t' \| '\f')
229	\| // handle newlines
230	( '\r' '\n' // MS
231	\| '\r' // Mac
232	\| '\n' // Unix
233	) { newline(); }
234	\| // handle continuation lines
235	( '\\' '\r' '\n' // MS
236	\| '\\' '\r' // Mac
237	\| '\\' '\n' // Unix
238	) {printf("CPP_parser.g continuation line detected\n");
239	deferredNewline();}
240	)
241	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
242	;
243
244	Comment
245	:
246	"/*"
247	( {LA(2) != '/'}? '*'
248	\| EndOfLine {deferredNewline();}
249	\| ~('*'\| '\r' \| '\n')
250	)*
251	"*/" {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
252	;
253
254	CPPComment
255	:
256	"//" (~('\n' \| '\r'))* EndOfLine
257	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
258	;
259
260	PREPROC_DIRECTIVE
261	options{paraphrase = "a line directive";}
262	:
263	'#' LineDirective
264	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
265	;
266
267	protected
268	LineDirective
269	:
270	{
271	deferredLineCount = 0;
272	}
273	("line")? // this would be for if the directive started "#line"
274	(Space)+
275	n:Decimal { setLine(OpenMD::lexi_cast<int>(n->getText()) - 1); }
276	(Space)+
277	(sl:StringLiteral) {std::string filename = sl->getText().substr(1,sl->getText().length()-2); observer->notify(filename);}
278	((Space)+ Decimal)* // To support cpp flags (GNU)
279	EndOfLine
280	;
281
282	protected
283	Space
284	:
285	(' '\|'\t'\|'\f')
286	;
287
288
289	// Literals:
290
291	/*
292	* Note that we do NOT handle tri-graphs nor multi-byte sequences.
293	*/
294
295	/*
296	* Note that we can't have empty character constants (even though we
297	* can have empty strings :-).
298	*/
299	CharLiteral
300	:
301	'\'' (Escape \| ~('\'')) '\''
302	;
303
304	/*
305	* Can't have raw imbedded newlines in string constants. Strict reading of
306	* the standard gives odd dichotomy between newlines & carriage returns.
307	* Go figure.
308	*/
309	StringLiteral
310	:
311	'"'
312	( Escape
313	\|
314	( "\\\r\n" // MS
315	\| "\\\r" // MAC
316	\| "\\\n" // Unix
317	) {deferredNewline();}
318	\|
319	~('"'\|'\r'\|'\n'\|'\\')
320	)*
321	'"'
322	;
323
324	protected
325	EndOfLine
326	:
327	( options{generateAmbigWarnings = false;}:
328	"\r\n" // MS
329	\| '\r' // Mac
330	\| '\n' // Unix
331	)
332	;
333
334	/*
335	* Handle the various escape sequences.
336	*
337	* Note carefully that these numeric escape sequences are not of the
338	* same form as the C language numeric constants.
339	*
340	* There is no such thing as a binary numeric escape sequence.
341	*
342	* Octal escape sequences are either 1, 2, or 3 octal digits exactly.
343	*
344	* There is no such thing as a decimal escape sequence.
345	*
346	* Hexadecimal escape sequences are begun with a leading \x and continue
347	* until a non-hexadecimal character is found.
348	*
349	* No real handling of tri-graph sequences, yet.
350	*/
351
352	protected
353	Escape
354	:
355	'\\'
356	( options{warnWhenFollowAmbig=false;}:
357	'a'
358	\| 'b'
359	\| 'f'
360	\| 'n'
361	\| 'r'
362	\| 't'
363	\| 'v'
364	\| '"'
365	\| '\''
366	\| '\\'
367	\| '?'
368	\| ('0'..'3') (options{warnWhenFollowAmbig=false;}: Digit (options{warnWhenFollowAmbig=false;}: Digit)? )?
369	\| ('4'..'7') (options{warnWhenFollowAmbig=false;}: Digit)?
370	\| 'x' (options{warnWhenFollowAmbig=false;}: Digit \| 'a'..'f' \| 'A'..'F')+
371	)
372	;
373
374
375	protected
376	Vocabulary
377	:
378	'\3'..'\377'
379	;
380
381
382	ID
383	options {testLiterals = true;}
384	:
385	('a'..'z'\|'A'..'Z'\|'_')
386	('a'..'z'\|'A'..'Z'\|'_'\|'0'..'9')*
387	;
388
389
390	protected
391	Digit
392	:
393	'0'..'9'
394	;
395
396	protected
397	Decimal
398	:
399	('0'..'9')+
400	;
401
402	// hexadecimal digit (again, note it's protected!)
403	protected
404	HEX_DIGIT
405	: ('0'..'9'\|'A'..'F'\|'a'..'f')
406	;
407
408
409	// a numeric literal
410	NUM_INT
411	{
412	bool isDecimal = false;
413	ANTLR_USE_NAMESPACE(antlr)RefToken t = ANTLR_USE_NAMESPACE(antlr)nullToken;
414	}
415	: ('+' \| '-')?
416	(
417	'.' {_ttype = DOT;}
418	( ('0'..'9')+ (EXPONENT)? (f1:FLOAT_SUFFIX {t=f1;})?
419	{
420	if ( t &&
421	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
422	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
423	_ttype = NUM_FLOAT;
424	}
425	else {
426	_ttype = NUM_DOUBLE; // assume double
427	}
428	}
429	)?
430
431	\| ( '0' {isDecimal = true;} // special case for just '0'
432	( ('x'\|'X')
433	( // hex
434	// the 'e'\|'E' and float suffix stuff look
435	// like hex digits, hence the (...)+ doesn't
436	// know when to stop: ambig. ANTLR resolves
437	// it correctly by matching immediately. It
438	// is therefor ok to hush warning.
439	options {
440	warnWhenFollowAmbig=false;
441	}
442	: HEX_DIGIT
443	)+
444	\| //float or double with leading zero
445	(('0'..'9')+ ('.'\|EXPONENT\|FLOAT_SUFFIX)) => ('0'..'9')+
446	\| ('0'..'7')+ // octal
447	)?
448	\| ('1'..'9') ('0'..'9')* {isDecimal=true;} // non-zero decimal
449	)
450	( ('l'\|'L') { _ttype = NUM_LONG; }
451
452	// only check to see if it's a float if looks like decimal so far
453	\| {isDecimal}?
454	( '.' ('0'..'9')* (EXPONENT)? (f2:FLOAT_SUFFIX {t=f2;})?
455	\| EXPONENT (f3:FLOAT_SUFFIX {t=f3;})?
456	\| f4:FLOAT_SUFFIX {t=f4;}
457	)
458	{
459	if ( t &&
460	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
461	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
462	_ttype = NUM_FLOAT;
463	}
464	else {
465	_ttype = NUM_DOUBLE; // assume double
466	}
467	}
468	)?
469	)
470	;
471
472	// a couple protected methods to assist in matching floating point numbers
473	protected
474	EXPONENT
475	: ('e'\|'E'\|'d'\|'D') ('+'\|'-')? ('0'..'9')+
476	;
477
478	protected
479	FLOAT_SUFFIX
480	: 'f'\|'F'\|'d'\|'D'
481	;