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
            | vectorConst
            | 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
        ;

protected
vectorConst
    : 
        LPAREN^ doubleNumber COMMA doubleNumber COMMA doubleNumber RPAREN
    ;

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:	1776
Committed:	Thu Aug 9 15:52:59 2012 UTC (12 years, 8 months ago) by gezelter
File size:	11242 byte(s)
Log Message:	Fixes to mdParser to handle vector assignments, fixes for VelocityVerletIntegrator deleting rnemd_ when it doesn't exist yet.
#	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	\| vectorConst
70	\| ID
71	\| StringLiteral
72	;
73
74	componentblock : COMPONENT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
75	;
76
77	zconstraintblock : ZCONSTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
78	;
79
80	restraintblock : RESTRAINT^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
81	;
82
83	flucqblock : FLUCQ^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
84	;
85
86	rnemdblock : RNEMD^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
87	;
88
89	minimizerblock : MINIMIZER^ LCURLY! (assignment)* RCURLY {#RCURLY->setType(ENDBLOCK);}
90	;
91
92	moleculeblock : MOLECULE^ LCURLY! (moleculestatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
93	;
94
95	moleculestatement : assignment
96	\| atomblock
97	\| bondblock
98	\| bendblock
99	\| torsionblock
100	\| inversionblock
101	\| rigidbodyblock
102	\| cutoffgroupblock
103	\| fragmentblock
104	;
105
106	atomblock : ATOM^ LBRACKET! intConst RBRACKET! LCURLY! (atomstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
107	;
108
109	atomstatement : assignment
110	\| POSITION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
111	\| ORIENTATION^ LPAREN! doubleNumberTuple RPAREN! SEMICOLON!
112	;
113
114
115	bondblock : BOND^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(bondstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
116	;
117
118	bondstatement : assignment
119	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
120	;
121
122	bendblock : BEND^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (bendstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
123	;
124
125	bendstatement : assignment
126	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
127	;
128
129	torsionblock : TORSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(torsionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
130	;
131
132	torsionstatement : assignment
133	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
134	;
135
136	inversionblock : INVERSION^ (LBRACKET! intConst! RBRACKET!)? LCURLY!(inversionstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
137	;
138
139	inversionstatement : assignment
140	\| CENTER^ LPAREN! intConst RPAREN! SEMICOLON!
141	;
142
143	rigidbodyblock : RIGIDBODY^ LBRACKET! intConst RBRACKET! LCURLY!(rigidbodystatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
144	;
145
146	rigidbodystatement : assignment
147	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
148	;
149
150	cutoffgroupblock : CUTOFFGROUP^ (LBRACKET! intConst! RBRACKET!)? LCURLY! (cutoffgroupstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
151	;
152
153	cutoffgroupstatement : assignment
154	\| MEMBERS^ LPAREN! inttuple RPAREN! SEMICOLON!
155	;
156
157	fragmentblock : FRAGMENT^ LBRACKET! intConst RBRACKET! LCURLY! (fragmentstatement)* RCURLY {#RCURLY->setType(ENDBLOCK);}
158	;
159
160	fragmentstatement : assignment
161	;
162
163
164
165	doubleNumberTuple : doubleNumber (COMMA! doubleNumber)*
166	;
167
168	inttuple : intConst (COMMA! intConst)*
169	;
170
171	protected
172	intConst
173	: NUM_INT \| NUM_LONG
174	;
175
176	protected
177	doubleNumber :
178	(intConst \| floatConst)
179	;
180
181	protected
182	floatConst
183	:
184	NUM_FLOAT \| NUM_DOUBLE
185	;
186
187	protected
188	vectorConst
189	:
190	LPAREN^ doubleNumber COMMA doubleNumber COMMA doubleNumber RPAREN
191	;
192
193	class MDLexer extends Lexer;
194
195	options
196	{
197	k = 3;
198	exportVocab = MD;
199	testLiterals = false;
200	}
201
202	tokens {
203	DOT;
204	}
205
206	{
207
208
209	int deferredLineCount;
210	FilenameObserver* observer;
211
212	public:
213	void setObserver(FilenameObserver* osv) {observer = osv;}
214	void initDeferredLineCount() { deferredLineCount = 0;}
215	void deferredNewline() {
216	deferredLineCount++;
217	}
218
219
220	virtual void newline() {
221	for (;deferredLineCount>0;deferredLineCount--) {
222	CharScanner::newline();
223	}
224	CharScanner::newline();
225	}
226
227	}
228
229
230	// Operators:
231
232	ASSIGNEQUAL : '=' ;
233	COLON : ':' ;
234	COMMA : ',' ;
235	QUESTIONMARK : '?' ;
236	SEMICOLON : ';' ;
237
238	LPAREN : '(' ;
239	RPAREN : ')' ;
240	LBRACKET : '[' ;
241	RBRACKET : ']' ;
242	LCURLY : '{' ;
243	RCURLY : '}' ;
244
245	Whitespace
246	:
247	( // whitespace ignored
248	(' ' \|'\t' \| '\f')
249	\| // handle newlines
250	( '\r' '\n' // MS
251	\| '\r' // Mac
252	\| '\n' // Unix
253	) { newline(); }
254	\| // handle continuation lines
255	( '\\' '\r' '\n' // MS
256	\| '\\' '\r' // Mac
257	\| '\\' '\n' // Unix
258	) {printf("CPP_parser.g continuation line detected\n");
259	deferredNewline();}
260	)
261	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
262	;
263
264	Comment
265	:
266	"/*"
267	( {LA(2) != '/'}? '*'
268	\| EndOfLine {deferredNewline();}
269	\| ~('*'\| '\r' \| '\n')
270	)*
271	"*/" {_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP;}
272	;
273
274	CPPComment
275	:
276	"//" (~('\n' \| '\r'))* EndOfLine
277	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
278	;
279
280	PREPROC_DIRECTIVE
281	options{paraphrase = "a line directive";}
282	:
283	'#' LineDirective
284	{_ttype = ANTLR_USE_NAMESPACE(antlr)Token::SKIP; newline();}
285	;
286
287	protected
288	LineDirective
289	:
290	{
291	deferredLineCount = 0;
292	}
293	("line")? // this would be for if the directive started "#line"
294	(Space)+
295	n:Decimal { setLine(OpenMD::lexi_cast<int>(n->getText()) - 1); }
296	(Space)+
297	(sl:StringLiteral) {std::string filename = sl->getText().substr(1,sl->getText().length()-2); observer->notify(filename);}
298	((Space)+ Decimal)* // To support cpp flags (GNU)
299	EndOfLine
300	;
301
302	protected
303	Space
304	:
305	(' '\|'\t'\|'\f')
306	;
307
308
309	// Literals:
310
311	/*
312	* Note that we do NOT handle tri-graphs nor multi-byte sequences.
313	*/
314
315	/*
316	* Note that we can't have empty character constants (even though we
317	* can have empty strings :-).
318	*/
319	CharLiteral
320	:
321	'\'' (Escape \| ~('\'')) '\''
322	;
323
324	/*
325	* Can't have raw imbedded newlines in string constants. Strict reading of
326	* the standard gives odd dichotomy between newlines & carriage returns.
327	* Go figure.
328	*/
329	StringLiteral
330	:
331	'"'
332	( Escape
333	\|
334	( "\\\r\n" // MS
335	\| "\\\r" // MAC
336	\| "\\\n" // Unix
337	) {deferredNewline();}
338	\|
339	~('"'\|'\r'\|'\n'\|'\\')
340	)*
341	'"'
342	;
343
344	protected
345	EndOfLine
346	:
347	( options{generateAmbigWarnings = false;}:
348	"\r\n" // MS
349	\| '\r' // Mac
350	\| '\n' // Unix
351	)
352	;
353
354	/*
355	* Handle the various escape sequences.
356	*
357	* Note carefully that these numeric escape sequences are not of the
358	* same form as the C language numeric constants.
359	*
360	* There is no such thing as a binary numeric escape sequence.
361	*
362	* Octal escape sequences are either 1, 2, or 3 octal digits exactly.
363	*
364	* There is no such thing as a decimal escape sequence.
365	*
366	* Hexadecimal escape sequences are begun with a leading \x and continue
367	* until a non-hexadecimal character is found.
368	*
369	* No real handling of tri-graph sequences, yet.
370	*/
371
372	protected
373	Escape
374	:
375	'\\'
376	( options{warnWhenFollowAmbig=false;}:
377	'a'
378	\| 'b'
379	\| 'f'
380	\| 'n'
381	\| 'r'
382	\| 't'
383	\| 'v'
384	\| '"'
385	\| '\''
386	\| '\\'
387	\| '?'
388	\| ('0'..'3') (options{warnWhenFollowAmbig=false;}: Digit (options{warnWhenFollowAmbig=false;}: Digit)? )?
389	\| ('4'..'7') (options{warnWhenFollowAmbig=false;}: Digit)?
390	\| 'x' (options{warnWhenFollowAmbig=false;}: Digit \| 'a'..'f' \| 'A'..'F')+
391	)
392	;
393
394
395	protected
396	Vocabulary
397	:
398	'\3'..'\377'
399	;
400
401
402	ID
403	options {testLiterals = true;}
404	:
405	('a'..'z'\|'A'..'Z'\|'_')
406	('a'..'z'\|'A'..'Z'\|'_'\|'0'..'9')*
407	;
408
409
410	protected
411	Digit
412	:
413	'0'..'9'
414	;
415
416	protected
417	Decimal
418	:
419	('0'..'9')+
420	;
421
422	// hexadecimal digit (again, note it's protected!)
423	protected
424	HEX_DIGIT
425	: ('0'..'9'\|'A'..'F'\|'a'..'f')
426	;
427
428
429	// a numeric literal
430	NUM_INT
431	{
432	bool isDecimal = false;
433	ANTLR_USE_NAMESPACE(antlr)RefToken t = ANTLR_USE_NAMESPACE(antlr)nullToken;
434	}
435	: ('+' \| '-')?
436	(
437	'.' {_ttype = DOT;}
438	( ('0'..'9')+ (EXPONENT)? (f1:FLOAT_SUFFIX {t=f1;})?
439	{
440	if ( t &&
441	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
442	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
443	_ttype = NUM_FLOAT;
444	}
445	else {
446	_ttype = NUM_DOUBLE; // assume double
447	}
448	}
449	)?
450
451	\| ( '0' {isDecimal = true;} // special case for just '0'
452	( ('x'\|'X')
453	( // hex
454	// the 'e'\|'E' and float suffix stuff look
455	// like hex digits, hence the (...)+ doesn't
456	// know when to stop: ambig. ANTLR resolves
457	// it correctly by matching immediately. It
458	// is therefor ok to hush warning.
459	options {
460	warnWhenFollowAmbig=false;
461	}
462	: HEX_DIGIT
463	)+
464	\| //float or double with leading zero
465	(('0'..'9')+ ('.'\|EXPONENT\|FLOAT_SUFFIX)) => ('0'..'9')+
466	\| ('0'..'7')+ // octal
467	)?
468	\| ('1'..'9') ('0'..'9')* {isDecimal=true;} // non-zero decimal
469	)
470	( ('l'\|'L') { _ttype = NUM_LONG; }
471
472	// only check to see if it's a float if looks like decimal so far
473	\| {isDecimal}?
474	( '.' ('0'..'9')* (EXPONENT)? (f2:FLOAT_SUFFIX {t=f2;})?
475	\| EXPONENT (f3:FLOAT_SUFFIX {t=f3;})?
476	\| f4:FLOAT_SUFFIX {t=f4;}
477	)
478	{
479	if ( t &&
480	(t->getText().find('f') != ANTLR_USE_NAMESPACE(std)string::npos \|\|
481	t->getText().find('F') != ANTLR_USE_NAMESPACE(std)string::npos ) ) {
482	_ttype = NUM_FLOAT;
483	}
484	else {
485	_ttype = NUM_DOUBLE; // assume double
486	}
487	}
488	)?
489	)
490	;
491
492	// a couple protected methods to assist in matching floating point numbers
493	protected
494	EXPONENT
495	: ('e'\|'E'\|'d'\|'D') ('+'\|'-')? ('0'..'9')+
496	;
497
498	protected
499	FLOAT_SUFFIX
500	: 'f'\|'F'\|'d'\|'D'
501	;