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";
  MINIMIZER   = "minimizer";
  ENDBLOCK;
}


mdfile  : (statement)*
        ;

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

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);}
    ;

minimizerblock  : MINIMIZER^ 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:	1746
Committed:	Wed Jun 6 02:18:54 2012 UTC (12 years, 11 months ago) by gezelter
File size:	11111 byte(s)
Log Message:	added a minimizer parsing block
#	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	MINIMIZER = "minimizer";
47	ENDBLOCK;
48	}
49
50
51	mdfile : (statement)*
52	;
53
54	statement : assignment
55	\| componentblock
56	\| moleculeblock
57	\| zconstraintblock
58	\| restraintblock
59	\| flucqblock
60	\| rnemdblock
61	\| minimizerblock
62	;
63
64	assignment : ID ASSIGNEQUAL^ constant SEMICOLON!
65	;
66
67	constant : intConst
68	\| floatConst
69	\| ID
70	\| StringLiteral
71	;
72
73	componentblock : COMPONENT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
74	;
75
76	zconstraintblock : ZCONSTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
77	;
78
79	restraintblock : RESTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
80	;
81
82	flucqblock : FLUCQ^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
83	;
84
85	rnemdblock : RNEMD^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
86	;
87
88	minimizerblock : MINIMIZER^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
89	;
90
91	moleculeblock : MOLECULE^ LCURLY! (moleculestatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
92	;
93
94	moleculestatement : assignment
95	\| atomblock
96	\| bondblock
97	\| bendblock
98	\| torsionblock
99	\| inversionblock
100	\| rigidbodyblock
101	\| cutoffgroupblock
102	\| fragmentblock
103	;
104
105	atomblock : ATOM^ LBRACKET! intConst RBRACKET! LCURLY! (atomstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
106	;
107
108	atomstatement : assignment
109	\| POSITION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
110	\| ORIENTATION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
111	;
112
113
114	bondblock : BOND^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(bondstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
115	;
116
117	bondstatement : assignment
118	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
119	;
120
121	bendblock : BEND^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (bendstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
122	;
123
124	bendstatement : assignment
125	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
126	;
127
128	torsionblock : TORSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(torsionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
129	;
130
131	torsionstatement : assignment
132	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
133	;
134
135	inversionblock : INVERSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(inversionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
136	;
137
138	inversionstatement : assignment
139	\| CENTER^ LPAREN! intConst RPAREN! SEMICOLON!
140	;
141
142	rigidbodyblock : RIGIDBODY^ LBRACKET! intConst RBRACKET! LCURLY!(rigidbodystatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
143	;
144
145	rigidbodystatement : assignment
146	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
147	;
148
149	cutoffgroupblock : CUTOFFGROUP^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (cutoffgroupstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
150	;
151
152	cutoffgroupstatement : assignment
153	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
154	;
155
156	fragmentblock : FRAGMENT^ LBRACKET! intConst RBRACKET! LCURLY! (fragmentstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
157	;
158
159	fragmentstatement : assignment
160	;
161
162
163
164	doubleNumberTuple : doubleNumber (COMMA! doubleNumber)*
165	;
166
167	inttuple : intConst (COMMA! intConst)*
168	;
169
170	protected
171	intConst
172	: NUM_INT \| NUM_LONG
173	;
174
175	protected
176	doubleNumber :
177	(intConst \| floatConst)
178	;
179
180	protected
181	floatConst
182	:
183	NUM_FLOAT \| NUM_DOUBLE
184	;
185
186
187
188	class MDLexer extends Lexer;
189
190	options
191	{
192	k = 3;
193	exportVocab = MD;
194	testLiterals = false;
195	}
196
197	tokens {
198	DOT;
199	}
200
201	{
202
203
204	int deferredLineCount;
205	FilenameObserver* observer;
206
207	public:
208	void setObserver(FilenameObserver* osv) {observer = osv;}
209	void initDeferredLineCount() { deferredLineCount = 0;}
210	void deferredNewline() {
211	deferredLineCount++;
212	}
213
214
215	virtual void newline() {
216	for (;deferredLineCount>0;deferredLineCount--) {
217	CharScanner::newline();
218	}
219	CharScanner::newline();
220	}
221
222	}
223
224
225	// Operators:
226
227	ASSIGNEQUAL : '=' ;
228	COLON : ':' ;
229	COMMA : ',' ;
230	QUESTIONMARK : '?' ;
231	SEMICOLON : ';' ;
232
233	LPAREN : '(' ;
234	RPAREN : ')' ;
235	LBRACKET : '[' ;
236	RBRACKET : ']' ;
237	LCURLY : '{' ;
238	RCURLY : '}' ;
239
240	Whitespace
241	:
242	( // whitespace ignored
243	(' ' \|'\t' \| '\f')
244	\| // handle newlines
245	( '\r' '\n' // MS
246	\| '\r' // Mac
247	\| '\n' // Unix
248	) { newline(); }
249	\| // handle continuation lines
250	( '\\' '\r' '\n' // MS
251	\| '\\' '\r' // Mac
252	\| '\\' '\n' // Unix
253	) {printf("CPP_parser.g continuation line detected\n");
254	deferredNewline();}
255	)
256	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
257	;
258
259	Comment
260	:
261	"/*"
262	( {LA(2) != '/'}? '*'
263	\| EndOfLine {deferredNewline();}
264	\| ~('*'\| '\r' \| '\n')
265	)*
266	"*/" {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
267	;
268
269	CPPComment
270	:
271	"//" (~('\n' \| '\r'))* EndOfLine
272	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
273	;
274
275	PREPROC_DIRECTIVE
276	options{paraphrase = "a line directive";}
277	:
278	'#' LineDirective
279	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
280	;
281
282	protected
283	LineDirective
284	:
285	{
286	deferredLineCount = 0;
287	}
288	("line")? // this would be for if the directive started "#line"
289	(Space)+
290	n:Decimal { setLine(OpenMD::lexi_cast<int>(n->getText()) - 1); }
291	(Space)+
292	(sl:StringLiteral) {std::string filename = sl->getText().substr(1,sl->getText().length()-2); observer->notify(filename);}
293	((Space)+ Decimal)* // To support cpp flags (GNU)
294	EndOfLine
295	;
296
297	protected
298	Space
299	:
300	(' '\|'\t'\|'\f')
301	;
302
303
304	// Literals:
305
306	/*
307	* Note that we do NOT handle tri-graphs nor multi-byte sequences.
308	*/
309
310	/*
311	* Note that we can't have empty character constants (even though we
312	* can have empty strings :-).
313	*/
314	CharLiteral
315	:
316	'\'' (Escape \| ~('\'')) '\''
317	;
318
319	/*
320	* Can't have raw imbedded newlines in string constants. Strict reading of
321	* the standard gives odd dichotomy between newlines & carriage returns.
322	* Go figure.
323	*/
324	StringLiteral
325	:
326	'"'
327	( Escape
328	\|
329	( "\\\r\n" // MS
330	\| "\\\r" // MAC
331	\| "\\\n" // Unix
332	) {deferredNewline();}
333	\|
334	~('"'\|'\r'\|'\n'\|'\\')
335	)*
336	'"'
337	;
338
339	protected
340	EndOfLine
341	:
342	( options{generateAmbigWarnings = false;}:
343	"\r\n" // MS
344	\| '\r' // Mac
345	\| '\n' // Unix
346	)
347	;
348
349	/*
350	* Handle the various escape sequences.
351	*
352	* Note carefully that these numeric escape sequences are not of the
353	* same form as the C language numeric constants.
354	*
355	* There is no such thing as a binary numeric escape sequence.
356	*
357	* Octal escape sequences are either 1, 2, or 3 octal digits exactly.
358	*
359	* There is no such thing as a decimal escape sequence.
360	*
361	* Hexadecimal escape sequences are begun with a leading \x and continue
362	* until a non-hexadecimal character is found.
363	*
364	* No real handling of tri-graph sequences, yet.
365	*/
366
367	protected
368	Escape
369	:
370	'\\'
371	( options{warnWhenFollowAmbig=false;}:
372	'a'
373	\| 'b'
374	\| 'f'
375	\| 'n'
376	\| 'r'
377	\| 't'
378	\| 'v'
379	\| '"'
380	\| '\''
381	\| '\\'
382	\| '?'
383	\| ('0'..'3') (options{warnWhenFollowAmbig=false;}: Digit (options{warnWhenFollowAmbig=false;}: Digit)? )?
384	\| ('4'..'7') (options{warnWhenFollowAmbig=false;}: Digit)?
385	\| 'x' (options{warnWhenFollowAmbig=false;}: Digit \| 'a'..'f' \| 'A'..'F')+
386	)
387	;
388
389
390	protected
391	Vocabulary
392	:
393	'\3'..'\377'
394	;
395
396
397	ID
398	options {testLiterals = true;}
399	:
400	('a'..'z'\|'A'..'Z'\|'_')
401	('a'..'z'\|'A'..'Z'\|'_'\|'0'..'9')*
402	;
403
404
405	protected
406	Digit
407	:
408	'0'..'9'
409	;
410
411	protected
412	Decimal
413	:
414	('0'..'9')+
415	;
416
417	// hexadecimal digit (again, note it's protected!)
418	protected
419	HEX_DIGIT
420	: ('0'..'9'\|'A'..'F'\|'a'..'f')
421	;
422
423
424	// a numeric literal
425	NUM_INT
426	{
427	bool isDecimal = false;
428	ANTLR_USE_NAMESPACE(antlr)RefToken t = ANTLR_USE_NAMESPACE(antlr)nullToken;
429	}
430	: ('+' \| '-')?
431	(
432	'.' {_ttype = DOT;}
433	( ('0'..'9')+ (EXPONENT)? (f1:FLOAT_SUFFIX {t=f1;})?
434	{
435	if ( t &&
436	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
437	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
438	_ttype = NUM_FLOAT;
439	}
440	else {
441	_ttype = NUM_DOUBLE; // assume double
442	}
443	}
444	)?
445
446	\| ( '0' {isDecimal = true;} // special case for just '0'
447	( ('x'\|'X')
448	( // hex
449	// the 'e'\|'E' and float suffix stuff look
450	// like hex digits, hence the (...)+ doesn't
451	// know when to stop: ambig. ANTLR resolves
452	// it correctly by matching immediately. It
453	// is therefor ok to hush warning.
454	options {
455	warnWhenFollowAmbig=false;
456	}
457	: HEX_DIGIT
458	)+
459	\| //float or double with leading zero
460	(('0'..'9')+ ('.'\|EXPONENT\|FLOAT_SUFFIX)) => ('0'..'9')+
461	\| ('0'..'7')+ // octal
462	)?
463	\| ('1'..'9') ('0'..'9')* {isDecimal=true;} // non-zero decimal
464	)
465	( ('l'\|'L') { _ttype = NUM_LONG; }
466
467	// only check to see if it's a float if looks like decimal so far
468	\| {isDecimal}?
469	( '.' ('0'..'9')* (EXPONENT)? (f2:FLOAT_SUFFIX {t=f2;})?
470	\| EXPONENT (f3:FLOAT_SUFFIX {t=f3;})?
471	\| f4:FLOAT_SUFFIX {t=f4;}
472	)
473	{
474	if ( t &&
475	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
476	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
477	_ttype = NUM_FLOAT;
478	}
479	else {
480	_ttype = NUM_DOUBLE; // assume double
481	}
482	}
483	)?
484	)
485	;
486
487	// a couple protected methods to assist in matching floating point numbers
488	protected
489	EXPONENT
490	: ('e'\|'E'\|'d'\|'D') ('+'\|'-')? ('0'..'9')+
491	;
492
493	protected
494	FLOAT_SUFFIX
495	: 'f'\|'F'\|'d'\|'D'
496	;