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lex.ll @ cc7bbe6

ADTast-experimentalenumpthread-emulationqualifiedEnum

Last change on this file since cc7bbe6 was 15f769c, checked in by Peter A. Buhr <pabuhr@…>, 3 years ago
add _DecimalXX to lexer/parser, but mark as unimplemented
Property mode set to `100644`
File size: 19.9 KB

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

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