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lex.ll@ 058f549

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ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc

Last change on this file since 058f549 was ad28abb, checked in by Peter A. Buhr <pabuhr@…>, 8 years ago
add space to error message for consistency with other messages
Property mode set to `100644`
File size: 17.2 KB

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1	/*
2	* Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3	*
4	* The contents of this file are covered under the licence agreement in the
5	* file "LICENCE" distributed with Cforall.
6	*
7	* lex.ll --
8	*
9	* Author : Peter A. Buhr
10	* Created On : Sat Sep 22 08:58:10 2001
11	* Last Modified By : Peter A. Buhr
12	* Last Modified On : Wed Aug 30 17:35:21 2017
13	* Update Count : 584
14	*/
15
16	%option yylineno
17	%option noyywrap
18	%option nounput
19
20	%{
21	// The lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive have been
22	// performed and removed from the source. The only exceptions are preprocessor directives passed to the compiler (e.g.,
23	// line-number directives) and C/C++ style comments, which are ignored.
24
25	//************************** Includes and Defines **************************
26
27	unsigned int column = 0; // position of the end of the last token parsed
28	#define YY_USER_ACTION column += yyleng; // trigger before each matching rule's action
29
30	#include <string>
31	#include <cstdio> // FILENAME_MAX
32	using namespace std;
33
34	#include "ParseNode.h"
35	#include "TypedefTable.h"
36
37	char *yyfilename;
38	string *strtext; // accumulate parts of character and string constant value
39
40	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
41	#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
42	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
43	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
44
45	#define WHITE_RETURN(x) // do nothing
46	#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
47	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
48	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
49	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
50	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
51	#define QKEYWORD_RETURN(x) typedefTable.isKind( yytext ); RETURN_VAL(x); // quasi-keyword
52	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
53	#define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER )
54
55	void rm_underscore() {
56	// Remove underscores in numeric constant by copying the non-underscore characters to the front of the string.
57	yyleng = 0;
58	for ( int i = 0; yytext[i] != '\0'; i += 1 ) {
59	if ( yytext[i] != '_' ) {
60	yytext[yyleng] = yytext[i];
61	yyleng += 1;
62	} // if
63	} // for
64	yytext[yyleng] = '\0';
65	}
66
67	// Stop warning due to incorrectly generated flex code.
68	#pragma GCC diagnostic ignored "-Wsign-compare"
69	%}
70
71	octal [0-7]
72	nonzero [1-9]
73	decimal [0-9]
74	hex [0-9a-fA-F]
75	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
76
77	// identifier, GCC: $ in identifier
78	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
79
80	// attribute identifier, GCC: $ in identifier
81	attr_identifier "@"{identifier}
82
83	// numeric constants, CFA: '_' in constant
84	hex_quad {hex}("_"?{hex}){3}
85	integer_suffix "_"?(([uU](("ll"\|"LL"\|[lL])[iI]\|[iI]?("ll"\|"LL"\|[lL])?))\|([iI](("ll"\|"LL"\|[lL])[uU]\|[uU]?("ll"\|"LL"\|[lL])?))\|(("ll"\|"LL"\|[lL])([iI][uU]\|[uU]?[iI]?)))
86
87	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
88	octal_prefix "0""_"?
89	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix}?
90
91	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
92	decimal_constant {nonzero_digits}{integer_suffix}?
93
94	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
95	hex_prefix "0"[xX]"_"?
96	hex_constant {hex_prefix}{hex_digits}{integer_suffix}?
97
98	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
99	real_decimal {decimal_digits}"."{exponent}?{floating_suffix}?
100	real_fraction "."{decimal_digits}{exponent}?{floating_suffix}?
101	real_constant {decimal_digits}{real_fraction}
102	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
103	// GCC: D (double) and iI (imaginary) suffixes, and DL (long double)
104	floating_suffix "_"?([fFdDlL][iI]?\|[iI][lLfFdD]?\|"DL")
105	floating_constant (({real_constant}{exponent}?)\|({decimal_digits}{exponent})){floating_suffix}?
106
107	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
108	hex_fractional_constant ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
109	hex_floating_constant {hex_prefix}(({hex_fractional_constant}{binary_exponent})\|({hex_digits}{binary_exponent})){floating_suffix}?
110
111	// character escape sequence, GCC: \e => esc character
112	simple_escape "\\"[abefnrtv'"?\\]
113	// ' stop highlighting
114	octal_escape "\\"{octal}("_"?{octal}){0,2}
115	hex_escape "\\""x""_"?{hex_digits}
116	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
117	cwide_prefix "L"\|"U"\|"u"
118	swide_prefix {cwide_prefix}\|"u8"
119
120	// display/white-space characters
121	h_tab [\011]
122	form_feed [\014]
123	v_tab [\013]
124	c_return [\015]
125	h_white [ ]\|{h_tab}
126
127	// overloadable operators
128	op_unary_only "~"\|"!"
129	op_unary_binary "+"\|"-"\|"*"
130	op_unary_pre_post "++"\|"--"
131	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
132
133	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
134	op_binary_over {op_unary_binary}\|{op_binary_only}
135	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
136	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
137
138	%x COMMENT
139	%x BKQUOTE
140	%x QUOTE
141	%x STRING
142
143	%%
144	/* line directives */
145	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
146	/* " stop highlighting */
147	static char filename[FILENAME_MAX]; // temporarily store current source-file name
148	char *end_num;
149	char begin_string, end_string;
150	long lineno, length;
151	lineno = strtol( yytext + 1, &end_num, 0 );
152	begin_string = strchr( end_num, '"' );
153	if ( begin_string ) { // file name ?
154	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
155	assert( end_string ); // closing quote ?
156	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
157	assert( length < FILENAME_MAX ); // room for sentinel ?
158	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
159	filename[ length ] = '\0'; // terminate string with sentinel
160	//cout << "file " << filename << " line " << lineno << endl;
161	yylineno = lineno;
162	yyfilename = filename;
163	} // if
164	}
165
166	/* ignore preprocessor directives (for now) */
167	^{h_white}"#"[^\n]"\n" ;
168
169	/* ignore C style comments (ALSO HANDLED BY CPP) */
170	"/*" { BEGIN COMMENT; }
171	<COMMENT>.\|\n ;
172	<COMMENT>"*/" { BEGIN 0; }
173
174	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
175	"//"[^\n]*"\n" ;
176
177	/* ignore whitespace */
178	{h_white}+ { WHITE_RETURN(' '); }
179	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
180	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
181
182	/* keywords */
183	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
184	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
185	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
186	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
187	asm { KEYWORD_RETURN(ASM); }
188	__asm { KEYWORD_RETURN(ASM); } // GCC
189	__asm__ { KEYWORD_RETURN(ASM); } // GCC
190	_At { KEYWORD_RETURN(AT); } // CFA
191	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
192	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
193	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
194	auto { KEYWORD_RETURN(AUTO); }
195	_Bool { KEYWORD_RETURN(BOOL); } // C99
196	break { KEYWORD_RETURN(BREAK); }
197	case { KEYWORD_RETURN(CASE); }
198	catch { KEYWORD_RETURN(CATCH); } // CFA
199	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
200	char { KEYWORD_RETURN(CHAR); }
201	choose { KEYWORD_RETURN(CHOOSE); } // CFA
202	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
203	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
204	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
205	const { KEYWORD_RETURN(CONST); }
206	__const { KEYWORD_RETURN(CONST); } // GCC
207	__const__ { KEYWORD_RETURN(CONST); } // GCC
208	continue { KEYWORD_RETURN(CONTINUE); }
209	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
210	default { KEYWORD_RETURN(DEFAULT); }
211	disable { KEYWORD_RETURN(DISABLE); } // CFA
212	do { KEYWORD_RETURN(DO); }
213	double { KEYWORD_RETURN(DOUBLE); }
214	dtype { KEYWORD_RETURN(DTYPE); } // CFA
215	else { KEYWORD_RETURN(ELSE); }
216	enable { KEYWORD_RETURN(ENABLE); } // CFA
217	enum { KEYWORD_RETURN(ENUM); }
218	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
219	extern { KEYWORD_RETURN(EXTERN); }
220	fallthrough { KEYWORD_RETURN(FALLTHRU); } // CFA
221	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
222	finally { KEYWORD_RETURN(FINALLY); } // CFA
223	float { KEYWORD_RETURN(FLOAT); }
224	__float128 { KEYWORD_RETURN(FLOAT); } // GCC
225	for { KEYWORD_RETURN(FOR); }
226	forall { KEYWORD_RETURN(FORALL); } // CFA
227	fortran { KEYWORD_RETURN(FORTRAN); }
228	ftype { KEYWORD_RETURN(FTYPE); } // CFA
229	_Generic { KEYWORD_RETURN(GENERIC); } // C11
230	goto { KEYWORD_RETURN(GOTO); }
231	if { KEYWORD_RETURN(IF); }
232	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
233	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
234	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
235	inline { KEYWORD_RETURN(INLINE); } // C99
236	__inline { KEYWORD_RETURN(INLINE); } // GCC
237	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
238	int { KEYWORD_RETURN(INT); }
239	__int128 { KEYWORD_RETURN(INT); } // GCC
240	__int128_t { KEYWORD_RETURN(INT); } // GCC
241	__label__ { KEYWORD_RETURN(LABEL); } // GCC
242	long { KEYWORD_RETURN(LONG); }
243	monitor { KEYWORD_RETURN(MONITOR); } // CFA
244	mutex { KEYWORD_RETURN(MUTEX); } // CFA
245	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
246	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
247	one_t { NUMERIC_RETURN(ONE_T); } // CFA
248	otype { KEYWORD_RETURN(OTYPE); } // CFA
249	register { KEYWORD_RETURN(REGISTER); }
250	restrict { KEYWORD_RETURN(RESTRICT); } // C99
251	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
252	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
253	return { KEYWORD_RETURN(RETURN); }
254	short { KEYWORD_RETURN(SHORT); }
255	signed { KEYWORD_RETURN(SIGNED); }
256	__signed { KEYWORD_RETURN(SIGNED); } // GCC
257	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
258	sizeof { KEYWORD_RETURN(SIZEOF); }
259	static { KEYWORD_RETURN(STATIC); }
260	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
261	struct { KEYWORD_RETURN(STRUCT); }
262	switch { KEYWORD_RETURN(SWITCH); }
263	thread { KEYWORD_RETURN(THREAD); } // C11
264	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
265	throw { KEYWORD_RETURN(THROW); } // CFA
266	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
267	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
268	trait { KEYWORD_RETURN(TRAIT); } // CFA
269	try { KEYWORD_RETURN(TRY); } // CFA
270	ttype { KEYWORD_RETURN(TTYPE); } // CFA
271	typedef { KEYWORD_RETURN(TYPEDEF); }
272	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
273	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
274	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
275	__uint128_t { KEYWORD_RETURN(INT); } // GCC
276	union { KEYWORD_RETURN(UNION); }
277	unsigned { KEYWORD_RETURN(UNSIGNED); }
278	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
279	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
280	void { KEYWORD_RETURN(VOID); }
281	volatile { KEYWORD_RETURN(VOLATILE); }
282	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
283	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
284	waitfor { KEYWORD_RETURN(WAITFOR); }
285	or { QKEYWORD_RETURN(WOR); } // CFA
286	when { KEYWORD_RETURN(WHEN); }
287	while { KEYWORD_RETURN(WHILE); }
288	with { KEYWORD_RETURN(WITH); } // CFA
289	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
290
291	/* identifier */
292	{identifier} { IDENTIFIER_RETURN(); }
293	{attr_identifier} { ATTRIBUTE_RETURN(); }
294	"`" { BEGIN BKQUOTE; }
295	<BKQUOTE>{identifier} { IDENTIFIER_RETURN(); }
296	<BKQUOTE>"`" { BEGIN 0; }
297
298	/* numeric constants */
299	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
300	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
301	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
302	{real_decimal} { NUMERIC_RETURN(REALDECIMALconstant); } // must appear before floating_constant
303	{real_fraction} { NUMERIC_RETURN(REALFRACTIONconstant); } // must appear before floating_constant
304	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
305	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
306
307	/* character constant, allows empty value */
308	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
309	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
310	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
311	/* ' stop highlighting */
312
313	/* string constant */
314	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
315	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
316	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
317	/* " stop highlighting */
318
319	/* common character/string constant */
320	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
321	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
322	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
323
324	/* punctuation */
325	"@" { ASCIIOP_RETURN(); }
326	"[" { ASCIIOP_RETURN(); }
327	"]" { ASCIIOP_RETURN(); }
328	"(" { ASCIIOP_RETURN(); }
329	")" { ASCIIOP_RETURN(); }
330	"{" { ASCIIOP_RETURN(); }
331	"}" { ASCIIOP_RETURN(); }
332	"," { ASCIIOP_RETURN(); } // also operator
333	":" { ASCIIOP_RETURN(); }
334	";" { ASCIIOP_RETURN(); }
335	"." { ASCIIOP_RETURN(); } // also operator
336	"..." { NAMEDOP_RETURN(ELLIPSIS); }
337
338	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
339	"<:" { RETURN_VAL('['); }
340	":>" { RETURN_VAL(']'); }
341	"<%" { RETURN_VAL('{'); }
342	"%>" { RETURN_VAL('}'); }
343
344	/* operators */
345	"!" { ASCIIOP_RETURN(); }
346	"+" { ASCIIOP_RETURN(); }
347	"-" { ASCIIOP_RETURN(); }
348	"*" { ASCIIOP_RETURN(); }
349	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
350	"/" { ASCIIOP_RETURN(); }
351	"%" { ASCIIOP_RETURN(); }
352	"^" { ASCIIOP_RETURN(); }
353	"~" { ASCIIOP_RETURN(); }
354	"&" { ASCIIOP_RETURN(); }
355	"\|" { ASCIIOP_RETURN(); }
356	"<" { ASCIIOP_RETURN(); }
357	">" { ASCIIOP_RETURN(); }
358	"=" { ASCIIOP_RETURN(); }
359	"?" { ASCIIOP_RETURN(); }
360
361	"++" { NAMEDOP_RETURN(ICR); }
362	"--" { NAMEDOP_RETURN(DECR); }
363	"==" { NAMEDOP_RETURN(EQ); }
364	"!=" { NAMEDOP_RETURN(NE); }
365	"<<" { NAMEDOP_RETURN(LS); }
366	">>" { NAMEDOP_RETURN(RS); }
367	"<=" { NAMEDOP_RETURN(LE); }
368	">=" { NAMEDOP_RETURN(GE); }
369	"&&" { NAMEDOP_RETURN(ANDAND); }
370	"\|\|" { NAMEDOP_RETURN(OROR); }
371	"->" { NAMEDOP_RETURN(ARROW); }
372	"+=" { NAMEDOP_RETURN(PLUSassign); }
373	"-=" { NAMEDOP_RETURN(MINUSassign); }
374	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
375	"*=" { NAMEDOP_RETURN(MULTassign); }
376	"/=" { NAMEDOP_RETURN(DIVassign); }
377	"%=" { NAMEDOP_RETURN(MODassign); }
378	"&=" { NAMEDOP_RETURN(ANDassign); }
379	"\|=" { NAMEDOP_RETURN(ORassign); }
380	"^=" { NAMEDOP_RETURN(ERassign); }
381	"<<=" { NAMEDOP_RETURN(LSassign); }
382	">>=" { NAMEDOP_RETURN(RSassign); }
383
384	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
385
386	/* CFA, operator identifier */
387	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
388	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
389	"^?{}" { IDENTIFIER_RETURN(); }
390	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
391	/*
392	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
393	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
394	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
395	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
396	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
397	identifier to disambiguate this common case.
398
399	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
400	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
401	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
402	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
403	any meaningful program.
404
405	The remaining cases are with the increment/decrement operators and conditional expression:
406
407	i++? ...(...);
408	i?++ ...(...);
409
410	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
411	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
412	space:
413
414	i++ ? i : 0;
415	i? ++i : 0;
416	*/
417	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
418	// 1 or 2 character unary operator ?
419	int i = yytext[1] == '?' ? 1 : 2;
420	yyless( i ); // put back characters up to first '?'
421	if ( i > 1 ) {
422	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
423	} else {
424	ASCIIOP_RETURN();
425	} // if
426	}
427
428	/* unknown character */
429	. { yyerror( "unknown character" ); }
430
431	%%
432	// ----end of lexer----
433
434	void yyerror( const char * errmsg ) {
435	cout << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
436	<< ": " << SemanticError::error_str() << errmsg << " at token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
437	}
438
439	// Local Variables: //
440	// mode: c++ //
441	// tab-width: 4 //
442	// compile-command: "make install" //
443	// End: //

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