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lex.ll @ 747a7c1

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Last change on this file since 747a7c1 was 79a6b17, checked in by Peter A. Buhr <pabuhr@…>, 22 months ago
print better error message when semi-colon missing after aggregate
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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 : Mon Jan 30 19:03:34 2023
13	* Update Count : 767
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	#ifdef __clang__
28	#pragma GCC diagnostic ignored "-Wnull-conversion"
29	#endif
30
31	// trigger before each matching rule's action
32	#define YY_USER_ACTION \
33	yylloc.first_line = yylineno; \
34	yylloc.first_column = column; \
35	column += yyleng; \
36	yylloc.last_column = column; \
37	yylloc.last_line = yylineno; \
38	yylloc.filename = yyfilename ? yyfilename : "";
39	unsigned int column = 0; // position of the end of the last token parsed
40
41	#include <string>
42	#include <cstdio> // FILENAME_MAX
43	using namespace std;
44
45	#include "config.h" // configure info
46	#include "ParseNode.h"
47	#include "TypedefTable.h"
48
49	string * build_postfix_name( string * name );
50
51	char *yyfilename;
52	string *strtext; // accumulate parts of character and string constant value
53
54	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
55	#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
56	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
57	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
58
59	#define WHITE_RETURN(x) // do nothing
60	#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
61	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
62	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
63	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
64	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
65	#define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword
66	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
67
68	#ifdef HAVE_KEYWORDS_FLOATXX // GCC >= 7 => keyword, otherwise typedef
69	#define FLOATXX(v) KEYWORD_RETURN(v);
70	#else
71	#define FLOATXX(v) IDENTIFIER_RETURN();
72	#endif // HAVE_KEYWORDS_FLOATXX
73
74	void rm_underscore() {
75	// SKULLDUGGERY: remove underscores (ok to shorten?)
76	yyleng = 0;
77	for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string
78	if ( yytext[i] != '_' ) {
79	yytext[yyleng] = yytext[i];
80	yyleng += 1;
81	} // if
82	} // for
83	yytext[yyleng] = '\0';
84	} // rm_underscore
85
86	// Stop warning due to incorrectly generated flex code.
87	#pragma GCC diagnostic ignored "-Wsign-compare"
88	%}
89
90	binary [0-1]
91	octal [0-7]
92	nonzero [1-9]
93	decimal [0-9]
94	hex [0-9a-fA-F]
95	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
96
97	// identifier, GCC: $ in identifier
98	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
99
100	// numeric constants, CFA: '_' in constant
101	hex_quad {hex}("_"?{hex}){3}
102	size_opt (8\|16\|32\|64\|128)?
103	// CFA: explicit l8/l16/l32/l64/l128, char 'hh', short 'h', int 'n'
104	length ("ll"\|"LL"\|[lL]{size_opt})\|("hh"\|"HH"\|[hHnN])
105	// CFA: size_t 'z', pointer 'p', which define a sign and length
106	integer_suffix_opt ("_"?(([uU]({length}?[iI]?)\|([iI]{length}))\|([iI]({length}?[uU]?)\|([uU]{length}))\|({length}([iI]?[uU]?)\|([uU][iI]))\|[zZ]\|[pP]))?
107
108	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
109	octal_prefix "0""_"?
110	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix_opt}
111
112	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
113	decimal_constant {nonzero_digits}{integer_suffix_opt}
114
115	binary_digits ({binary})\|({binary}({binary}\|"_")*{binary})
116	binary_prefix "0"[bB]"_"?
117	binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt}
118
119	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
120	hex_prefix "0"[xX]"_"?
121	hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
122
123	// GCC: floating D (double), imaginary iI, and decimal floating DF, DD, DL
124	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
125	floating_size 16\|32\|32x\|64\|64x\|80\|128\|128x
126	floating_length ([fFdDlLwWqQ]\|[fF]{floating_size})
127	floating_suffix ({floating_length}?[iI]?)\|([iI]{floating_length})
128	decimal_floating_suffix [dD][fFdDlL]
129	floating_suffix_opt ("_"?({floating_suffix}\|{decimal_floating_suffix}))?
130	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
131	floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
132	floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
133	floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})\|({decimal_digits}{floating_fraction})
134
135	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
136	hex_floating_suffix_opt ("_"?({floating_suffix}))?
137	hex_floating_fraction ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
138	hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})\|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
139
140	// character escape sequence, GCC: \e => esc character
141	simple_escape "\\"[abefnrtv'"?\\]
142	// ' stop editor highlighting
143	octal_escape "\\"{octal}("_"?{octal}){0,2}
144	hex_escape "\\""x""_"?{hex_digits}
145	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
146	cwide_prefix "L"\|"U"\|"u"
147	swide_prefix {cwide_prefix}\|"u8"
148
149	// display/white-space characters
150	h_tab [\011]
151	form_feed [\014]
152	v_tab [\013]
153	c_return [\015]
154	h_white [ ]\|{h_tab}
155
156	// overloadable operators
157	op_unary_only "~"\|"!"
158	op_unary_binary "+"\|"-"\|"*"
159	op_unary_pre_post "++"\|"--"
160	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
161
162	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
163	op_binary_over {op_unary_binary}\|{op_binary_only}
164	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
165	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
166
167	%x COMMENT
168	%x BKQUOTE
169	%x QUOTE
170	%x STRING
171
172	%%
173	/* line directives */
174	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
175	/* " stop editor highlighting */
176	static char filename[FILENAME_MAX]; // temporarily store current source-file name
177	char *end_num;
178	char begin_string, end_string;
179	long lineno, length;
180	lineno = strtol( yytext + 1, &end_num, 0 );
181	begin_string = strchr( end_num, '"' );
182	if ( begin_string ) { // file name ?
183	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
184	assert( end_string ); // closing quote ?
185	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
186	assert( length < FILENAME_MAX ); // room for sentinel ?
187	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
188	filename[ length ] = '\0'; // terminate string with sentinel
189	//cout << "file " << filename << " line " << lineno << endl;
190	yylineno = lineno;
191	yyfilename = filename;
192	} // if
193	}
194
195	/* preprocessor-style directives */
196	^{h_white}"#"[^\n]"\n" { RETURN_VAL( DIRECTIVE ); }
197
198	/* ignore C style comments (ALSO HANDLED BY CPP) */
199	"/*" { BEGIN COMMENT; }
200	<COMMENT>.\|\n ;
201	<COMMENT>"*/" { BEGIN 0; }
202
203	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
204	"//"[^\n]*"\n" ;
205
206	/* ignore whitespace */
207	{h_white}+ { WHITE_RETURN(' '); }
208	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
209	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
210
211	/* keywords */
212	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
213	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
214	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
215	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
216	asm { KEYWORD_RETURN(ASM); }
217	__asm { KEYWORD_RETURN(ASM); } // GCC
218	__asm__ { KEYWORD_RETURN(ASM); } // GCC
219	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
220	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
221	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
222	auto { KEYWORD_RETURN(AUTO); }
223	__auto_type { KEYWORD_RETURN(AUTO_TYPE); }
224	basetypeof { KEYWORD_RETURN(BASETYPEOF); } // CFA
225	_Bool { KEYWORD_RETURN(BOOL); } // C99
226	break { KEYWORD_RETURN(BREAK); }
227	case { KEYWORD_RETURN(CASE); }
228	catch { QKEYWORD_RETURN(CATCH); } // CFA
229	catchResume { QKEYWORD_RETURN(CATCHRESUME); } // CFA
230	char { KEYWORD_RETURN(CHAR); }
231	choose { KEYWORD_RETURN(CHOOSE); } // CFA
232	coerce { KEYWORD_RETURN(COERCE); } // CFA
233	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
234	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
235	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
236	const { KEYWORD_RETURN(CONST); }
237	__const { KEYWORD_RETURN(CONST); } // GCC
238	__const__ { KEYWORD_RETURN(CONST); } // GCC
239	continue { KEYWORD_RETURN(CONTINUE); }
240	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
241	_Decimal32 { KEYWORD_RETURN(DECIMAL32); } // GCC
242	_Decimal64 { KEYWORD_RETURN(DECIMAL64); } // GCC
243	_Decimal128 { KEYWORD_RETURN(DECIMAL128); } // GCC
244	default { KEYWORD_RETURN(DEFAULT); }
245	disable { KEYWORD_RETURN(DISABLE); } // CFA
246	do { KEYWORD_RETURN(DO); }
247	double { KEYWORD_RETURN(DOUBLE); }
248	dtype { KEYWORD_RETURN(DTYPE); } // CFA
249	else { KEYWORD_RETURN(ELSE); }
250	enable { KEYWORD_RETURN(ENABLE); } // CFA
251	enum { KEYWORD_RETURN(ENUM); }
252	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
253	exception { KEYWORD_RETURN(EXCEPTION); } // CFA
254	extern { KEYWORD_RETURN(EXTERN); }
255	fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
256	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
257	finally { QKEYWORD_RETURN(FINALLY); } // CFA
258	fixup { QKEYWORD_RETURN(FIXUP); } // CFA
259	float { KEYWORD_RETURN(FLOAT); }
260	__float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
261	float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
262	__float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
263	float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
264	_Float16 { FLOATXX(uFLOAT16); } // GCC
265	_Float32 { FLOATXX(uFLOAT32); } // GCC
266	_Float32x { FLOATXX(uFLOAT32X); } // GCC
267	_Float64 { FLOATXX(uFLOAT64); } // GCC
268	_Float64x { FLOATXX(uFLOAT64X); } // GCC
269	_Float128 { FLOATXX(uFLOAT128); } // GCC
270	_Float128x { FLOATXX(uFLOAT128); } // GCC
271	for { KEYWORD_RETURN(FOR); }
272	forall { KEYWORD_RETURN(FORALL); } // CFA
273	fortran { KEYWORD_RETURN(FORTRAN); }
274	ftype { KEYWORD_RETURN(FTYPE); } // CFA
275	generator { KEYWORD_RETURN(GENERATOR); } // CFA
276	_Generic { KEYWORD_RETURN(GENERIC); } // C11
277	goto { KEYWORD_RETURN(GOTO); }
278	if { KEYWORD_RETURN(IF); }
279	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
280	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
281	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
282	inline { KEYWORD_RETURN(INLINE); } // C99
283	__inline { KEYWORD_RETURN(INLINE); } // GCC
284	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
285	int { KEYWORD_RETURN(INT); }
286	int128 { KEYWORD_RETURN(INT128); } // CFA
287	__int128 { KEYWORD_RETURN(INT128); } // GCC
288	__int128_t { KEYWORD_RETURN(INT128); } // GCC
289	__label__ { KEYWORD_RETURN(LABEL); } // GCC
290	long { KEYWORD_RETURN(LONG); }
291	monitor { KEYWORD_RETURN(MONITOR); } // CFA
292	mutex { KEYWORD_RETURN(MUTEX); } // CFA
293	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
294	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
295	one_t { NUMERIC_RETURN(ONE_T); } // CFA
296	or { QKEYWORD_RETURN(WOR); } // CFA
297	otype { KEYWORD_RETURN(OTYPE); } // CFA
298	recover { QKEYWORD_RETURN(RECOVER); } // CFA
299	register { KEYWORD_RETURN(REGISTER); }
300	report { KEYWORD_RETURN(THROWRESUME); } // CFA
301	restrict { KEYWORD_RETURN(RESTRICT); } // C99
302	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
303	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
304	return { KEYWORD_RETURN(RETURN); }
305	/* resume { KEYWORD_RETURN(RESUME); } // CFA */
306	short { KEYWORD_RETURN(SHORT); }
307	signed { KEYWORD_RETURN(SIGNED); }
308	__signed { KEYWORD_RETURN(SIGNED); } // GCC
309	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
310	sizeof { KEYWORD_RETURN(SIZEOF); }
311	static { KEYWORD_RETURN(STATIC); }
312	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
313	struct { KEYWORD_RETURN(STRUCT); }
314	suspend { KEYWORD_RETURN(SUSPEND); } // CFA
315	switch { KEYWORD_RETURN(SWITCH); }
316	thread { KEYWORD_RETURN(THREAD); } // C11
317	__thread { KEYWORD_RETURN(THREADLOCALGCC); } // GCC
318	_Thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C11
319	throw { KEYWORD_RETURN(THROW); } // CFA
320	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
321	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
322	trait { KEYWORD_RETURN(TRAIT); } // CFA
323	try { KEYWORD_RETURN(TRY); } // CFA
324	ttype { KEYWORD_RETURN(TTYPE); } // CFA
325	typedef { KEYWORD_RETURN(TYPEDEF); }
326	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
327	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
328	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
329	typeid { KEYWORD_RETURN(TYPEID); } // GCC
330	union { KEYWORD_RETURN(UNION); }
331	__uint128_t { KEYWORD_RETURN(UINT128); } // GCC
332	unsigned { KEYWORD_RETURN(UNSIGNED); }
333	__builtin_va_arg { KEYWORD_RETURN(VA_ARG); } // GCC
334	__builtin_va_list { KEYWORD_RETURN(VA_LIST); } // GCC
335	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
336	void { KEYWORD_RETURN(VOID); }
337	volatile { KEYWORD_RETURN(VOLATILE); }
338	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
339	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
340	vtable { KEYWORD_RETURN(VTABLE); } // CFA
341	waitfor { KEYWORD_RETURN(WAITFOR); } // CFA
342	waituntil { KEYWORD_RETURN(WAITUNTIL); } // CFA
343	when { KEYWORD_RETURN(WHEN); } // CFA
344	while { KEYWORD_RETURN(WHILE); }
345	with { KEYWORD_RETURN(WITH); } // CFA
346	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
347
348	/* identifier */
349	{identifier} { IDENTIFIER_RETURN(); }
350	"``"{identifier} { // CFA
351	yytext[yyleng] = '\0'; yytext += 2; // SKULLDUGGERY: remove backquotes (ok to shorten?)
352	IDENTIFIER_RETURN();
353	}
354
355	/* numeric constants */
356	{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
357	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
358	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
359	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
360	{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
361	{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
362	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
363	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
364
365	/* character constant, allows empty value */
366	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
367	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
368	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
369	/* ' stop editor highlighting */
370
371	/* string constant */
372	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
373	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
374	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
375	/* " stop editor highlighting */
376
377	/* common character/string constant */
378	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
379	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
380	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
381
382	/* punctuation */
383	"@" { ASCIIOP_RETURN(); }
384	"`" { ASCIIOP_RETURN(); }
385	"[" { ASCIIOP_RETURN(); }
386	"]" { ASCIIOP_RETURN(); }
387	"(" { ASCIIOP_RETURN(); }
388	")" { ASCIIOP_RETURN(); }
389	"{" { ASCIIOP_RETURN(); }
390	"}" { ASCIIOP_RETURN(); }
391	"," { ASCIIOP_RETURN(); } // also operator
392	":" { ASCIIOP_RETURN(); }
393	";" { ASCIIOP_RETURN(); }
394	"." { ASCIIOP_RETURN(); } // also operator
395	"..." { NAMEDOP_RETURN(ELLIPSIS); }
396
397	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
398	"<:" { RETURN_VAL('['); }
399	":>" { RETURN_VAL(']'); }
400	"<%" { RETURN_VAL('{'); }
401	"%>" { RETURN_VAL('}'); }
402
403	/* operators */
404	"!" { ASCIIOP_RETURN(); }
405	"+" { ASCIIOP_RETURN(); }
406	"-" { ASCIIOP_RETURN(); }
407	"*" { ASCIIOP_RETURN(); }
408	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
409	"/" { ASCIIOP_RETURN(); }
410	"%" { ASCIIOP_RETURN(); }
411	"^" { ASCIIOP_RETURN(); }
412	"~" { ASCIIOP_RETURN(); }
413	"&" { ASCIIOP_RETURN(); }
414	"\|" { ASCIIOP_RETURN(); }
415	"<" { ASCIIOP_RETURN(); }
416	">" { ASCIIOP_RETURN(); }
417	"=" { ASCIIOP_RETURN(); }
418	"?" { ASCIIOP_RETURN(); }
419
420	"++" { NAMEDOP_RETURN(ICR); }
421	"--" { NAMEDOP_RETURN(DECR); }
422	"==" { NAMEDOP_RETURN(EQ); }
423	"!=" { NAMEDOP_RETURN(NE); }
424	"<<" { NAMEDOP_RETURN(LS); }
425	">>" { NAMEDOP_RETURN(RS); }
426	"<=" { NAMEDOP_RETURN(LE); }
427	">=" { NAMEDOP_RETURN(GE); }
428	"&&" { NAMEDOP_RETURN(ANDAND); }
429	"\|\|" { NAMEDOP_RETURN(OROR); }
430	"->" { NAMEDOP_RETURN(ARROW); }
431	"+=" { NAMEDOP_RETURN(PLUSassign); }
432	"-=" { NAMEDOP_RETURN(MINUSassign); }
433	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
434	"*=" { NAMEDOP_RETURN(MULTassign); }
435	"/=" { NAMEDOP_RETURN(DIVassign); }
436	"%=" { NAMEDOP_RETURN(MODassign); }
437	"&=" { NAMEDOP_RETURN(ANDassign); }
438	"\|=" { NAMEDOP_RETURN(ORassign); }
439	"^=" { NAMEDOP_RETURN(ERassign); }
440	"<<=" { NAMEDOP_RETURN(LSassign); }
441	">>=" { NAMEDOP_RETURN(RSassign); }
442
443	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
444	"~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
445	"-~" { NAMEDOP_RETURN(ErangeDown); } // CFA
446	"-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA
447
448	/* CFA, operator identifier */
449	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
450	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
451	"^?{}" { IDENTIFIER_RETURN(); }
452	"?`"{identifier} { // postfix operator
453	yylval.tok.str = new string( &yytext[2] ); // remove ?`
454	yylval.tok.str = build_postfix_name( yylval.tok.str ); // add prefix
455	RETURN_LOCN( typedefTable.isKind( *yylval.tok.str ) );
456	}
457	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
458	/*
459	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
460	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
461	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
462	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
463	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
464	identifier to disambiguate this common case.
465
466	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
467	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
468	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
469	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
470	any meaningful program.
471
472	The remaining cases are with the increment/decrement operators and conditional expression:
473
474	i++? ...(...);
475	i?++ ...(...);
476
477	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
478	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
479	space:
480
481	i++ ? i : 0;
482	i? ++i : 0;
483	*/
484	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
485	// 1 or 2 character unary operator ?
486	int i = yytext[1] == '?' ? 1 : 2;
487	yyless( i ); // put back characters up to first '?'
488	if ( i > 1 ) {
489	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
490	} else {
491	ASCIIOP_RETURN();
492	} // if
493	}
494
495	/* unknown character */
496	. { yyerror( "unknown character" ); }
497
498	%%
499
500	// ----end of lexer----
501
502	void yyerror( const char * errmsg ) {
503	SemanticErrorThrow = true;
504	cerr << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
505	<< ": " << ErrorHelpers::error_str() << errmsg << " before token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
506	}
507
508	// Local Variables: //
509	// mode: c++ //
510	// tab-width: 4 //
511	// compile-command: "make install" //
512	// End: //

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