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lex.ll@ 0809c4e

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ADT ast-experimental pthread-emulation qualifiedEnum

Last change on this file since 0809c4e was c5d5723, checked in by Thierry Delisle <tdelisle@…>, 3 years ago
Disabled null conversion warning in lexer.
Property mode set to `100644`
File size: 20.0 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 : Sun Jun 20 18:41:09 2021
13	* Update Count : 759
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	// trigger before each matching rule's action
28	#define YY_USER_ACTION \
29	yylloc.first_line = yylineno; \
30	yylloc.first_column = column; \
31	column += yyleng; \
32	yylloc.last_column = column; \
33	yylloc.last_line = yylineno; \
34	yylloc.filename = yyfilename ? yyfilename : "";
35	unsigned int column = 0; // position of the end of the last token parsed
36
37	#include <string>
38	#include <cstdio> // FILENAME_MAX
39	using namespace std;
40
41	#include "config.h" // configure info
42	#include "ParseNode.h"
43	#include "TypedefTable.h"
44
45	string * build_postfix_name( string * name );
46
47	char *yyfilename;
48	string *strtext; // accumulate parts of character and string constant value
49
50	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
51	#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
52	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
53	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
54
55	#define WHITE_RETURN(x) // do nothing
56	#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
57	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
58	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
59	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
60	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
61	#define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword
62	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
63
64	#ifdef HAVE_KEYWORDS_FLOATXX // GCC >= 7 => keyword, otherwise typedef
65	#define FLOATXX(v) KEYWORD_RETURN(v);
66	#else
67	#define FLOATXX(v) IDENTIFIER_RETURN();
68	#endif // HAVE_KEYWORDS_FLOATXX
69
70	void rm_underscore() {
71	// SKULLDUGGERY: remove underscores (ok to shorten?)
72	yyleng = 0;
73	for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string
74	if ( yytext[i] != '_' ) {
75	yytext[yyleng] = yytext[i];
76	yyleng += 1;
77	} // if
78	} // for
79	yytext[yyleng] = '\0';
80	} // rm_underscore
81
82	// Stop warning due to incorrectly generated flex code.
83	#pragma GCC diagnostic ignored "-Wsign-compare"
84
85	// lex uses __null in a boolean context, it's fine.
86	#pragma GCC diagnostic ignored "-Wnull-conversion"
87	%}
88
89	binary [0-1]
90	octal [0-7]
91	nonzero [1-9]
92	decimal [0-9]
93	hex [0-9a-fA-F]
94	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
95
96	// identifier, GCC: $ in identifier
97	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
98
99	// numeric constants, CFA: '_' in constant
100	hex_quad {hex}("_"?{hex}){3}
101	size_opt (8\|16\|32\|64\|128)?
102	// CFA: explicit l8/l16/l32/l64/l128, char 'hh', short 'h', int 'n'
103	length ("ll"\|"LL"\|[lL]{size_opt})\|("hh"\|"HH"\|[hHnN])
104	// CFA: size_t 'z', pointer 'p', which define a sign and length
105	integer_suffix_opt ("_"?(([uU]({length}?[iI]?)\|([iI]{length}))\|([iI]({length}?[uU]?)\|([uU]{length}))\|({length}([iI]?[uU]?)\|([uU][iI]))\|[zZ]\|[pP]))?
106
107	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
108	octal_prefix "0""_"?
109	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix_opt}
110
111	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
112	decimal_constant {nonzero_digits}{integer_suffix_opt}
113
114	binary_digits ({binary})\|({binary}({binary}\|"_")*{binary})
115	binary_prefix "0"[bB]"_"?
116	binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt}
117
118	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
119	hex_prefix "0"[xX]"_"?
120	hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
121
122	// GCC: floating D (double), imaginary iI, and decimal floating DF, DD, DL
123	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
124	floating_size 16\|32\|32x\|64\|64x\|80\|128\|128x
125	floating_length ([fFdDlLwWqQ]\|[fF]{floating_size})
126	floating_suffix ({floating_length}?[iI]?)\|([iI]{floating_length})
127	decimal_floating_suffix [dD][fFdDlL]
128	floating_suffix_opt ("_"?({floating_suffix}\|{decimal_floating_suffix}))?
129	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
130	floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
131	floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
132	floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})\|({decimal_digits}{floating_fraction})
133
134	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
135	hex_floating_suffix_opt ("_"?({floating_suffix}))?
136	hex_floating_fraction ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
137	hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})\|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
138
139	// character escape sequence, GCC: \e => esc character
140	simple_escape "\\"[abefnrtv'"?\\]
141	// ' stop editor highlighting
142	octal_escape "\\"{octal}("_"?{octal}){0,2}
143	hex_escape "\\""x""_"?{hex_digits}
144	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
145	cwide_prefix "L"\|"U"\|"u"
146	swide_prefix {cwide_prefix}\|"u8"
147
148	// display/white-space characters
149	h_tab [\011]
150	form_feed [\014]
151	v_tab [\013]
152	c_return [\015]
153	h_white [ ]\|{h_tab}
154
155	// overloadable operators
156	op_unary_only "~"\|"!"
157	op_unary_binary "+"\|"-"\|"*"
158	op_unary_pre_post "++"\|"--"
159	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
160
161	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
162	op_binary_over {op_unary_binary}\|{op_binary_only}
163	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
164	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
165
166	%x COMMENT
167	%x BKQUOTE
168	%x QUOTE
169	%x STRING
170
171	%%
172	/* line directives */
173	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
174	/* " stop editor highlighting */
175	static char filename[FILENAME_MAX]; // temporarily store current source-file name
176	char *end_num;
177	char begin_string, end_string;
178	long lineno, length;
179	lineno = strtol( yytext + 1, &end_num, 0 );
180	begin_string = strchr( end_num, '"' );
181	if ( begin_string ) { // file name ?
182	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
183	assert( end_string ); // closing quote ?
184	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
185	assert( length < FILENAME_MAX ); // room for sentinel ?
186	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
187	filename[ length ] = '\0'; // terminate string with sentinel
188	//cout << "file " << filename << " line " << lineno << endl;
189	yylineno = lineno;
190	yyfilename = filename;
191	} // if
192	}
193
194	/* preprocessor-style directives */
195	^{h_white}"#"[^\n]"\n" { RETURN_VAL( DIRECTIVE ); }
196
197	/* ignore C style comments (ALSO HANDLED BY CPP) */
198	"/*" { BEGIN COMMENT; }
199	<COMMENT>.\|\n ;
200	<COMMENT>"*/" { BEGIN 0; }
201
202	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
203	"//"[^\n]*"\n" ;
204
205	/* ignore whitespace */
206	{h_white}+ { WHITE_RETURN(' '); }
207	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
208	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
209
210	/* keywords */
211	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
212	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
213	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
214	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
215	asm { KEYWORD_RETURN(ASM); }
216	__asm { KEYWORD_RETURN(ASM); } // GCC
217	__asm__ { KEYWORD_RETURN(ASM); } // GCC
218	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
219	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
220	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
221	auto { KEYWORD_RETURN(AUTO); }
222	__auto_type { KEYWORD_RETURN(AUTO_TYPE); }
223	basetypeof { KEYWORD_RETURN(BASETYPEOF); } // CFA
224	_Bool { KEYWORD_RETURN(BOOL); } // C99
225	break { KEYWORD_RETURN(BREAK); }
226	case { KEYWORD_RETURN(CASE); }
227	catch { QKEYWORD_RETURN(CATCH); } // CFA
228	catchResume { QKEYWORD_RETURN(CATCHRESUME); } // CFA
229	char { KEYWORD_RETURN(CHAR); }
230	choose { KEYWORD_RETURN(CHOOSE); } // CFA
231	coerce { KEYWORD_RETURN(COERCE); } // CFA
232	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
233	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
234	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
235	const { KEYWORD_RETURN(CONST); }
236	__const { KEYWORD_RETURN(CONST); } // GCC
237	__const__ { KEYWORD_RETURN(CONST); } // GCC
238	continue { KEYWORD_RETURN(CONTINUE); }
239	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
240	_Decimal32 { KEYWORD_RETURN(DECIMAL32); } // GCC
241	_Decimal64 { KEYWORD_RETURN(DECIMAL64); } // GCC
242	_Decimal128 { KEYWORD_RETURN(DECIMAL128); } // GCC
243	default { KEYWORD_RETURN(DEFAULT); }
244	disable { KEYWORD_RETURN(DISABLE); } // CFA
245	do { KEYWORD_RETURN(DO); }
246	double { KEYWORD_RETURN(DOUBLE); }
247	dtype { KEYWORD_RETURN(DTYPE); } // CFA
248	else { KEYWORD_RETURN(ELSE); }
249	enable { KEYWORD_RETURN(ENABLE); } // CFA
250	enum { KEYWORD_RETURN(ENUM); }
251	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
252	exception { KEYWORD_RETURN(EXCEPTION); } // CFA
253	extern { KEYWORD_RETURN(EXTERN); }
254	fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
255	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
256	finally { QKEYWORD_RETURN(FINALLY); } // CFA
257	fixup { QKEYWORD_RETURN(FIXUP); } // CFA
258	float { KEYWORD_RETURN(FLOAT); }
259	__float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
260	float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
261	__float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
262	float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
263	_Float16 { FLOATXX(uFLOAT16); } // GCC
264	_Float32 { FLOATXX(uFLOAT32); } // GCC
265	_Float32x { FLOATXX(uFLOAT32X); } // GCC
266	_Float64 { FLOATXX(uFLOAT64); } // GCC
267	_Float64x { FLOATXX(uFLOAT64X); } // GCC
268	_Float128 { FLOATXX(uFLOAT128); } // GCC
269	_Float128x { FLOATXX(uFLOAT128); } // GCC
270	for { KEYWORD_RETURN(FOR); }
271	forall { KEYWORD_RETURN(FORALL); } // CFA
272	fortran { KEYWORD_RETURN(FORTRAN); }
273	ftype { KEYWORD_RETURN(FTYPE); } // CFA
274	generator { KEYWORD_RETURN(GENERATOR); } // CFA
275	_Generic { KEYWORD_RETURN(GENERIC); } // C11
276	goto { KEYWORD_RETURN(GOTO); }
277	if { KEYWORD_RETURN(IF); }
278	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
279	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
280	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
281	inline { KEYWORD_RETURN(INLINE); } // C99
282	__inline { KEYWORD_RETURN(INLINE); } // GCC
283	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
284	int { KEYWORD_RETURN(INT); }
285	int128 { KEYWORD_RETURN(INT128); } // CFA
286	__int128 { KEYWORD_RETURN(INT128); } // GCC
287	__int128_t { KEYWORD_RETURN(INT128); } // GCC
288	__label__ { KEYWORD_RETURN(LABEL); } // GCC
289	long { KEYWORD_RETURN(LONG); }
290	monitor { KEYWORD_RETURN(MONITOR); } // CFA
291	mutex { KEYWORD_RETURN(MUTEX); } // CFA
292	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
293	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
294	one_t { NUMERIC_RETURN(ONE_T); } // CFA
295	or { QKEYWORD_RETURN(WOR); } // CFA
296	otype { KEYWORD_RETURN(OTYPE); } // CFA
297	recover { QKEYWORD_RETURN(RECOVER); } // CFA
298	register { KEYWORD_RETURN(REGISTER); }
299	report { KEYWORD_RETURN(THROWRESUME); } // CFA
300	restrict { KEYWORD_RETURN(RESTRICT); } // C99
301	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
302	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
303	return { KEYWORD_RETURN(RETURN); }
304	/* resume { KEYWORD_RETURN(RESUME); } // CFA */
305	short { KEYWORD_RETURN(SHORT); }
306	signed { KEYWORD_RETURN(SIGNED); }
307	__signed { KEYWORD_RETURN(SIGNED); } // GCC
308	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
309	sizeof { KEYWORD_RETURN(SIZEOF); }
310	static { KEYWORD_RETURN(STATIC); }
311	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
312	struct { KEYWORD_RETURN(STRUCT); }
313	suspend { KEYWORD_RETURN(SUSPEND); } // CFA
314	switch { KEYWORD_RETURN(SWITCH); }
315	thread { KEYWORD_RETURN(THREAD); } // C11
316	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
317	throw { KEYWORD_RETURN(THROW); } // CFA
318	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
319	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
320	trait { KEYWORD_RETURN(TRAIT); } // CFA
321	try { KEYWORD_RETURN(TRY); } // CFA
322	ttype { KEYWORD_RETURN(TTYPE); } // CFA
323	typedef { KEYWORD_RETURN(TYPEDEF); }
324	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
325	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
326	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
327	typeid { KEYWORD_RETURN(TYPEID); } // GCC
328	union { KEYWORD_RETURN(UNION); }
329	__uint128_t { KEYWORD_RETURN(UINT128); } // GCC
330	unsigned { KEYWORD_RETURN(UNSIGNED); }
331	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
332	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
333	void { KEYWORD_RETURN(VOID); }
334	volatile { KEYWORD_RETURN(VOLATILE); }
335	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
336	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
337	vtable { KEYWORD_RETURN(VTABLE); } // CFA
338	waitfor { KEYWORD_RETURN(WAITFOR); } // CFA
339	when { KEYWORD_RETURN(WHEN); } // CFA
340	while { KEYWORD_RETURN(WHILE); }
341	with { KEYWORD_RETURN(WITH); } // CFA
342	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
343
344	/* identifier */
345	{identifier} { IDENTIFIER_RETURN(); }
346	"``"{identifier} { // CFA
347	yytext[yyleng] = '\0'; yytext += 2; // SKULLDUGGERY: remove backquotes (ok to shorten?)
348	IDENTIFIER_RETURN();
349	}
350
351	/* numeric constants */
352	{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
353	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
354	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
355	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
356	{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
357	{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
358	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
359	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
360
361	/* character constant, allows empty value */
362	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
363	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
364	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
365	/* ' stop editor highlighting */
366
367	/* string constant */
368	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
369	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
370	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
371	/* " stop editor highlighting */
372
373	/* common character/string constant */
374	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
375	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
376	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
377
378	/* punctuation */
379	"@" { ASCIIOP_RETURN(); }
380	"`" { ASCIIOP_RETURN(); }
381	"[" { ASCIIOP_RETURN(); }
382	"]" { ASCIIOP_RETURN(); }
383	"(" { ASCIIOP_RETURN(); }
384	")" { ASCIIOP_RETURN(); }
385	"{" { ASCIIOP_RETURN(); }
386	"}" { ASCIIOP_RETURN(); }
387	"," { ASCIIOP_RETURN(); } // also operator
388	":" { ASCIIOP_RETURN(); }
389	";" { ASCIIOP_RETURN(); }
390	"." { ASCIIOP_RETURN(); } // also operator
391	"..." { NAMEDOP_RETURN(ELLIPSIS); }
392
393	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
394	"<:" { RETURN_VAL('['); }
395	":>" { RETURN_VAL(']'); }
396	"<%" { RETURN_VAL('{'); }
397	"%>" { RETURN_VAL('}'); }
398
399	/* operators */
400	"!" { ASCIIOP_RETURN(); }
401	"+" { ASCIIOP_RETURN(); }
402	"-" { ASCIIOP_RETURN(); }
403	"*" { ASCIIOP_RETURN(); }
404	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
405	"/" { ASCIIOP_RETURN(); }
406	"%" { ASCIIOP_RETURN(); }
407	"^" { ASCIIOP_RETURN(); }
408	"~" { ASCIIOP_RETURN(); }
409	"&" { ASCIIOP_RETURN(); }
410	"\|" { ASCIIOP_RETURN(); }
411	"<" { ASCIIOP_RETURN(); }
412	">" { ASCIIOP_RETURN(); }
413	"=" { ASCIIOP_RETURN(); }
414	"?" { ASCIIOP_RETURN(); }
415
416	"++" { NAMEDOP_RETURN(ICR); }
417	"--" { NAMEDOP_RETURN(DECR); }
418	"==" { NAMEDOP_RETURN(EQ); }
419	"!=" { NAMEDOP_RETURN(NE); }
420	"<<" { NAMEDOP_RETURN(LS); }
421	">>" { NAMEDOP_RETURN(RS); }
422	"<=" { NAMEDOP_RETURN(LE); }
423	">=" { NAMEDOP_RETURN(GE); }
424	"&&" { NAMEDOP_RETURN(ANDAND); }
425	"\|\|" { NAMEDOP_RETURN(OROR); }
426	"->" { NAMEDOP_RETURN(ARROW); }
427	"+=" { NAMEDOP_RETURN(PLUSassign); }
428	"-=" { NAMEDOP_RETURN(MINUSassign); }
429	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
430	"*=" { NAMEDOP_RETURN(MULTassign); }
431	"/=" { NAMEDOP_RETURN(DIVassign); }
432	"%=" { NAMEDOP_RETURN(MODassign); }
433	"&=" { NAMEDOP_RETURN(ANDassign); }
434	"\|=" { NAMEDOP_RETURN(ORassign); }
435	"^=" { NAMEDOP_RETURN(ERassign); }
436	"<<=" { NAMEDOP_RETURN(LSassign); }
437	">>=" { NAMEDOP_RETURN(RSassign); }
438
439	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
440	"~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
441	"-~" { NAMEDOP_RETURN(ErangeDown); } // CFA
442	"-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA
443
444	/* CFA, operator identifier */
445	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
446	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
447	"^?{}" { IDENTIFIER_RETURN(); }
448	"?`"{identifier} { // postfix operator
449	yylval.tok.str = new string( &yytext[2] ); // remove ?`
450	yylval.tok.str = build_postfix_name( yylval.tok.str ); // add prefix
451	RETURN_LOCN( typedefTable.isKind( *yylval.tok.str ) );
452	}
453	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
454	/*
455	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
456	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
457	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
458	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
459	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
460	identifier to disambiguate this common case.
461
462	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
463	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
464	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
465	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
466	any meaningful program.
467
468	The remaining cases are with the increment/decrement operators and conditional expression:
469
470	i++? ...(...);
471	i?++ ...(...);
472
473	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
474	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
475	space:
476
477	i++ ? i : 0;
478	i? ++i : 0;
479	*/
480	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
481	// 1 or 2 character unary operator ?
482	int i = yytext[1] == '?' ? 1 : 2;
483	yyless( i ); // put back characters up to first '?'
484	if ( i > 1 ) {
485	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
486	} else {
487	ASCIIOP_RETURN();
488	} // if
489	}
490
491	/* unknown character */
492	. { yyerror( "unknown character" ); }
493
494	%%
495
496	// ----end of lexer----
497
498	void yyerror( const char * errmsg ) {
499	SemanticErrorThrow = true;
500	cerr << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
501	<< ": " << ErrorHelpers::error_str() << errmsg << " at token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
502	}
503
504	// Local Variables: //
505	// mode: c++ //
506	// tab-width: 4 //
507	// compile-command: "make install" //
508	// End: //

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