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 (16 years, 9 months ago) by gezelter
Original Path:	*trunk/src/mdParser/MDParser.g*
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.
#	User	Rev	Content
1	tim	770	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	cli2	1275	INVERSION = "inversion";
36	tim	770	RIGIDBODY = "rigidBody";
37			CUTOFFGROUP = "cutoffGroup";
38			FRAGMENT = "fragment";
39			MEMBERS = "members";
40	cli2	1275	CENTER = "center";
41	tim	770	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	tim	814	constant : intConst
60			\| floatConst
61	tim	770	\| 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	gezelter	1277	\| inversionblock
80	tim	770	\| 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	tim	814	\| POSITION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
90			\| ORIENTATION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
91	tim	770	;
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	cli2	1275	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	tim	770	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	tim	814	doubleNumberTuple : doubleNumber (COMMA! doubleNumber)*
145	tim	770	;
146
147			inttuple : intConst (COMMA! intConst)*
148			;
149
150			protected
151			intConst
152	tim	814	: NUM_INT \| NUM_LONG
153	tim	770	;
154
155			protected
156	tim	814	doubleNumber :
157	tim	770	(intConst \| floatConst)
158			;
159
160			protected
161			floatConst
162			:
163	tim	814	NUM_FLOAT \| NUM_DOUBLE
164	tim	770	;
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	tim	814	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	tim	770	Digit
387			:
388			'0'..'9'
389			;
390
391			protected
392			Decimal
393			:
394			('0'..'9')+
395			;
396
397	tim	814	// hexadecimal digit (again, note it's protected!)
398	tim	770	protected
399	tim	814	HEX_DIGIT
400			: ('0'..'9'\|'A'..'F'\|'a'..'f')
401			;
402	tim	770
403
404	tim	814	// 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	tim	770
426	tim	814	\| ( '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	tim	770	protected
469	tim	814	EXPONENT
470	gezelter	848	: ('e'\|'E'\|'d'\|'D') ('+'\|'-')? ('0'..'9')+
471	tim	814	;
472	tim	770
473			protected
474	tim	814	FLOAT_SUFFIX
475			: 'f'\|'F'\|'d'\|'D'
476			;