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";
  FLUCQ       = "flucQ";
  RNEMD       = "RNEMD";
  ENDBLOCK;
}


mdfile  : (statement)*
        ;

statement : assignment
    | componentblock
    | moleculeblock
    | zconstraintblock
    | restraintblock
    | flucqblock
    | rnemdblock
    ;

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);}
                  ;

flucqblock  : FLUCQ^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
    ;

rnemdblock  : RNEMD^ 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:	1731
Committed:	Thu May 31 12:25:30 2012 UTC (12 years, 11 months ago) by gezelter
File size:	10966 byte(s)
Log Message:	Reorganized source directories, added RNEMD and flucQ blocks for options parsing.
#	Content
1	header
2	{
3
4	#include "antlr/CharScanner.hpp"
5	#include "utils/StringUtils.hpp"
6	#include "mdParser/FilenameObserver.hpp"
7	}
8
9	options
10	{
11	language = "Cpp";
12	}
13
14	class MDParser extends Parser;
15
16	options
17	{
18	k = 3;
19	exportVocab = MD;
20	buildAST = true;
21	codeGenMakeSwitchThreshold = 2;
22	codeGenBitsetTestThreshold = 3;
23
24	}
25
26	tokens
27	{
28	COMPONENT = "component";
29	MOLECULE = "molecule";
30	ZCONSTRAINT = "zconstraint";
31	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	FLUCQ = "flucQ";
45	RNEMD = "RNEMD";
46	ENDBLOCK;
47	}
48
49
50	mdfile : (statement)*
51	;
52
53	statement : assignment
54	\| componentblock
55	\| moleculeblock
56	\| zconstraintblock
57	\| restraintblock
58	\| flucqblock
59	\| rnemdblock
60	;
61
62	assignment : ID ASSIGNEQUAL^ constant SEMICOLON!
63	;
64
65	constant : intConst
66	\| floatConst
67	\| ID
68	\| StringLiteral
69	;
70
71	componentblock : COMPONENT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
72	;
73
74	zconstraintblock : ZCONSTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
75	;
76
77	restraintblock : RESTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
78	;
79
80	flucqblock : FLUCQ^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
81	;
82
83	rnemdblock : RNEMD^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
84	;
85
86	moleculeblock : MOLECULE^ LCURLY! (moleculestatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
87	;
88
89	moleculestatement : assignment
90	\| atomblock
91	\| bondblock
92	\| bendblock
93	\| torsionblock
94	\| inversionblock
95	\| rigidbodyblock
96	\| cutoffgroupblock
97	\| fragmentblock
98	;
99
100	atomblock : ATOM^ LBRACKET! intConst RBRACKET! LCURLY! (atomstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
101	;
102
103	atomstatement : assignment
104	\| POSITION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
105	\| ORIENTATION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
106	;
107
108
109	bondblock : BOND^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(bondstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
110	;
111
112	bondstatement : assignment
113	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
114	;
115
116	bendblock : BEND^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (bendstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
117	;
118
119	bendstatement : assignment
120	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
121	;
122
123	torsionblock : TORSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(torsionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
124	;
125
126	torsionstatement : assignment
127	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
128	;
129
130	inversionblock : INVERSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(inversionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
131	;
132
133	inversionstatement : assignment
134	\| CENTER^ LPAREN! intConst RPAREN! SEMICOLON!
135	;
136
137	rigidbodyblock : RIGIDBODY^ LBRACKET! intConst RBRACKET! LCURLY!(rigidbodystatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
138	;
139
140	rigidbodystatement : assignment
141	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
142	;
143
144	cutoffgroupblock : CUTOFFGROUP^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (cutoffgroupstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
145	;
146
147	cutoffgroupstatement : assignment
148	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
149	;
150
151	fragmentblock : FRAGMENT^ LBRACKET! intConst RBRACKET! LCURLY! (fragmentstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
152	;
153
154	fragmentstatement : assignment
155	;
156
157
158
159	doubleNumberTuple : doubleNumber (COMMA! doubleNumber)*
160	;
161
162	inttuple : intConst (COMMA! intConst)*
163	;
164
165	protected
166	intConst
167	: NUM_INT \| NUM_LONG
168	;
169
170	protected
171	doubleNumber :
172	(intConst \| floatConst)
173	;
174
175	protected
176	floatConst
177	:
178	NUM_FLOAT \| NUM_DOUBLE
179	;
180
181
182
183	class MDLexer extends Lexer;
184
185	options
186	{
187	k = 3;
188	exportVocab = MD;
189	testLiterals = false;
190	}
191
192	tokens {
193	DOT;
194	}
195
196	{
197
198
199	int deferredLineCount;
200	FilenameObserver* observer;
201
202	public:
203	void setObserver(FilenameObserver* osv) {observer = osv;}
204	void initDeferredLineCount() { deferredLineCount = 0;}
205	void deferredNewline() {
206	deferredLineCount++;
207	}
208
209
210	virtual void newline() {
211	for (;deferredLineCount>0;deferredLineCount--) {
212	CharScanner::newline();
213	}
214	CharScanner::newline();
215	}
216
217	}
218
219
220	// Operators:
221
222	ASSIGNEQUAL : '=' ;
223	COLON : ':' ;
224	COMMA : ',' ;
225	QUESTIONMARK : '?' ;
226	SEMICOLON : ';' ;
227
228	LPAREN : '(' ;
229	RPAREN : ')' ;
230	LBRACKET : '[' ;
231	RBRACKET : ']' ;
232	LCURLY : '{' ;
233	RCURLY : '}' ;
234
235	Whitespace
236	:
237	( // whitespace ignored
238	(' ' \|'\t' \| '\f')
239	\| // handle newlines
240	( '\r' '\n' // MS
241	\| '\r' // Mac
242	\| '\n' // Unix
243	) { newline(); }
244	\| // handle continuation lines
245	( '\\' '\r' '\n' // MS
246	\| '\\' '\r' // Mac
247	\| '\\' '\n' // Unix
248	) {printf("CPP_parser.g continuation line detected\n");
249	deferredNewline();}
250	)
251	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
252	;
253
254	Comment
255	:
256	"/*"
257	( {LA(2) != '/'}? '*'
258	\| EndOfLine {deferredNewline();}
259	\| ~('*'\| '\r' \| '\n')
260	)*
261	"*/" {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
262	;
263
264	CPPComment
265	:
266	"//" (~('\n' \| '\r'))* EndOfLine
267	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
268	;
269
270	PREPROC_DIRECTIVE
271	options{paraphrase = "a line directive";}
272	:
273	'#' LineDirective
274	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
275	;
276
277	protected
278	LineDirective
279	:
280	{
281	deferredLineCount = 0;
282	}
283	("line")? // this would be for if the directive started "#line"
284	(Space)+
285	n:Decimal { setLine(OpenMD::lexi_cast<int>(n->getText()) - 1); }
286	(Space)+
287	(sl:StringLiteral) {std::string filename = sl->getText().substr(1,sl->getText().length()-2); observer->notify(filename);}
288	((Space)+ Decimal)* // To support cpp flags (GNU)
289	EndOfLine
290	;
291
292	protected
293	Space
294	:
295	(' '\|'\t'\|'\f')
296	;
297
298
299	// Literals:
300
301	/*
302	* Note that we do NOT handle tri-graphs nor multi-byte sequences.
303	*/
304
305	/*
306	* Note that we can't have empty character constants (even though we
307	* can have empty strings :-).
308	*/
309	CharLiteral
310	:
311	'\'' (Escape \| ~('\'')) '\''
312	;
313
314	/*
315	* Can't have raw imbedded newlines in string constants. Strict reading of
316	* the standard gives odd dichotomy between newlines & carriage returns.
317	* Go figure.
318	*/
319	StringLiteral
320	:
321	'"'
322	( Escape
323	\|
324	( "\\\r\n" // MS
325	\| "\\\r" // MAC
326	\| "\\\n" // Unix
327	) {deferredNewline();}
328	\|
329	~('"'\|'\r'\|'\n'\|'\\')
330	)*
331	'"'
332	;
333
334	protected
335	EndOfLine
336	:
337	( options{generateAmbigWarnings = false;}:
338	"\r\n" // MS
339	\| '\r' // Mac
340	\| '\n' // Unix
341	)
342	;
343
344	/*
345	* Handle the various escape sequences.
346	*
347	* Note carefully that these numeric escape sequences are not of the
348	* same form as the C language numeric constants.
349	*
350	* There is no such thing as a binary numeric escape sequence.
351	*
352	* Octal escape sequences are either 1, 2, or 3 octal digits exactly.
353	*
354	* There is no such thing as a decimal escape sequence.
355	*
356	* Hexadecimal escape sequences are begun with a leading \x and continue
357	* until a non-hexadecimal character is found.
358	*
359	* No real handling of tri-graph sequences, yet.
360	*/
361
362	protected
363	Escape
364	:
365	'\\'
366	( options{warnWhenFollowAmbig=false;}:
367	'a'
368	\| 'b'
369	\| 'f'
370	\| 'n'
371	\| 'r'
372	\| 't'
373	\| 'v'
374	\| '"'
375	\| '\''
376	\| '\\'
377	\| '?'
378	\| ('0'..'3') (options{warnWhenFollowAmbig=false;}: Digit (options{warnWhenFollowAmbig=false;}: Digit)? )?
379	\| ('4'..'7') (options{warnWhenFollowAmbig=false;}: Digit)?
380	\| 'x' (options{warnWhenFollowAmbig=false;}: Digit \| 'a'..'f' \| 'A'..'F')+
381	)
382	;
383
384
385	protected
386	Vocabulary
387	:
388	'\3'..'\377'
389	;
390
391
392	ID
393	options {testLiterals = true;}
394	:
395	('a'..'z'\|'A'..'Z'\|'_')
396	('a'..'z'\|'A'..'Z'\|'_'\|'0'..'9')*
397	;
398
399
400	protected
401	Digit
402	:
403	'0'..'9'
404	;
405
406	protected
407	Decimal
408	:
409	('0'..'9')+
410	;
411
412	// hexadecimal digit (again, note it's protected!)
413	protected
414	HEX_DIGIT
415	: ('0'..'9'\|'A'..'F'\|'a'..'f')
416	;
417
418
419	// a numeric literal
420	NUM_INT
421	{
422	bool isDecimal = false;
423	ANTLR_USE_NAMESPACE(antlr)RefToken t = ANTLR_USE_NAMESPACE(antlr)nullToken;
424	}
425	: ('+' \| '-')?
426	(
427	'.' {_ttype = DOT;}
428	( ('0'..'9')+ (EXPONENT)? (f1:FLOAT_SUFFIX {t=f1;})?
429	{
430	if ( t &&
431	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
432	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
433	_ttype = NUM_FLOAT;
434	}
435	else {
436	_ttype = NUM_DOUBLE; // assume double
437	}
438	}
439	)?
440
441	\| ( '0' {isDecimal = true;} // special case for just '0'
442	( ('x'\|'X')
443	( // hex
444	// the 'e'\|'E' and float suffix stuff look
445	// like hex digits, hence the (...)+ doesn't
446	// know when to stop: ambig. ANTLR resolves
447	// it correctly by matching immediately. It
448	// is therefor ok to hush warning.
449	options {
450	warnWhenFollowAmbig=false;
451	}
452	: HEX_DIGIT
453	)+
454	\| //float or double with leading zero
455	(('0'..'9')+ ('.'\|EXPONENT\|FLOAT_SUFFIX)) => ('0'..'9')+
456	\| ('0'..'7')+ // octal
457	)?
458	\| ('1'..'9') ('0'..'9')* {isDecimal=true;} // non-zero decimal
459	)
460	( ('l'\|'L') { _ttype = NUM_LONG; }
461
462	// only check to see if it's a float if looks like decimal so far
463	\| {isDecimal}?
464	( '.' ('0'..'9')* (EXPONENT)? (f2:FLOAT_SUFFIX {t=f2;})?
465	\| EXPONENT (f3:FLOAT_SUFFIX {t=f3;})?
466	\| f4:FLOAT_SUFFIX {t=f4;}
467	)
468	{
469	if ( t &&
470	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
471	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
472	_ttype = NUM_FLOAT;
473	}
474	else {
475	_ttype = NUM_DOUBLE; // assume double
476	}
477	}
478	)?
479	)
480	;
481
482	// a couple protected methods to assist in matching floating point numbers
483	protected
484	EXPONENT
485	: ('e'\|'E'\|'d'\|'D') ('+'\|'-')? ('0'..'9')+
486	;
487
488	protected
489	FLOAT_SUFFIX
490	: 'f'\|'F'\|'d'\|'D'
491	;