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lex.ll @ e3bc51c

ADTarm-ehast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-astnew-ast-unique-exprpthread-emulationqualifiedEnum

Last change on this file since e3bc51c was 37cdd97, checked in by Thierry Delisle <tdelisle@…>, 5 years ago
Added a ast node for suspend statements
Property mode set to `100644`
File size: 19.4 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 : Sat Feb 15 11:05:50 2020
13	* Update Count : 737
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: D (double) and iI (imaginary) suffixes, and DL (long double)
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	floating_suffix_opt ("_"?({floating_suffix}\|"DL"))?
125	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
126	floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
127	floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
128	floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})\|({decimal_digits}{floating_fraction})
129
130	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
131	hex_floating_suffix_opt ("_"?({floating_suffix}))?
132	hex_floating_fraction ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
133	hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})\|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
134
135	// character escape sequence, GCC: \e => esc character
136	simple_escape "\\"[abefnrtv'"?\\]
137	// ' stop editor highlighting
138	octal_escape "\\"{octal}("_"?{octal}){0,2}
139	hex_escape "\\""x""_"?{hex_digits}
140	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
141	cwide_prefix "L"\|"U"\|"u"
142	swide_prefix {cwide_prefix}\|"u8"
143
144	// display/white-space characters
145	h_tab [\011]
146	form_feed [\014]
147	v_tab [\013]
148	c_return [\015]
149	h_white [ ]\|{h_tab}
150
151	// overloadable operators
152	op_unary_only "~"\|"!"
153	op_unary_binary "+"\|"-"\|"*"
154	op_unary_pre_post "++"\|"--"
155	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
156
157	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
158	op_binary_over {op_unary_binary}\|{op_binary_only}
159	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
160	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
161
162	%x COMMENT
163	%x BKQUOTE
164	%x QUOTE
165	%x STRING
166
167	%%
168	/* line directives */
169	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
170	/* " stop editor highlighting */
171	static char filename[FILENAME_MAX]; // temporarily store current source-file name
172	char *end_num;
173	char begin_string, end_string;
174	long lineno, length;
175	lineno = strtol( yytext + 1, &end_num, 0 );
176	begin_string = strchr( end_num, '"' );
177	if ( begin_string ) { // file name ?
178	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
179	assert( end_string ); // closing quote ?
180	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
181	assert( length < FILENAME_MAX ); // room for sentinel ?
182	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
183	filename[ length ] = '\0'; // terminate string with sentinel
184	//cout << "file " << filename << " line " << lineno << endl;
185	yylineno = lineno;
186	yyfilename = filename;
187	} // if
188	}
189
190	/* preprocessor-style directives */
191	^{h_white}"#"[^\n]"\n" { RETURN_VAL( DIRECTIVE ); }
192
193	/* ignore C style comments (ALSO HANDLED BY CPP) */
194	"/*" { BEGIN COMMENT; }
195	<COMMENT>.\|\n ;
196	<COMMENT>"*/" { BEGIN 0; }
197
198	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
199	"//"[^\n]*"\n" ;
200
201	/* ignore whitespace */
202	{h_white}+ { WHITE_RETURN(' '); }
203	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
204	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
205
206	/* keywords */
207	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
208	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
209	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
210	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
211	asm { KEYWORD_RETURN(ASM); }
212	__asm { KEYWORD_RETURN(ASM); } // GCC
213	__asm__ { KEYWORD_RETURN(ASM); } // GCC
214	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
215	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
216	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
217	auto { KEYWORD_RETURN(AUTO); }
218	__auto_type { KEYWORD_RETURN(AUTO_TYPE); }
219	basetypeof { KEYWORD_RETURN(BASETYPEOF); } // CFA
220	_Bool { KEYWORD_RETURN(BOOL); } // C99
221	break { KEYWORD_RETURN(BREAK); }
222	case { KEYWORD_RETURN(CASE); }
223	catch { KEYWORD_RETURN(CATCH); } // CFA
224	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
225	char { KEYWORD_RETURN(CHAR); }
226	choose { KEYWORD_RETURN(CHOOSE); } // CFA
227	coerce { KEYWORD_RETURN(COERCE); } // CFA
228	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
229	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
230	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
231	const { KEYWORD_RETURN(CONST); }
232	__const { KEYWORD_RETURN(CONST); } // GCC
233	__const__ { KEYWORD_RETURN(CONST); } // GCC
234	continue { KEYWORD_RETURN(CONTINUE); }
235	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
236	default { KEYWORD_RETURN(DEFAULT); }
237	disable { KEYWORD_RETURN(DISABLE); } // CFA
238	do { KEYWORD_RETURN(DO); }
239	double { KEYWORD_RETURN(DOUBLE); }
240	dtype { KEYWORD_RETURN(DTYPE); } // CFA
241	else { KEYWORD_RETURN(ELSE); }
242	enable { KEYWORD_RETURN(ENABLE); } // CFA
243	enum { KEYWORD_RETURN(ENUM); }
244	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
245	exception { KEYWORD_RETURN(EXCEPTION); } // CFA
246	extern { KEYWORD_RETURN(EXTERN); }
247	fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
248	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
249	finally { KEYWORD_RETURN(FINALLY); } // CFA
250	float { KEYWORD_RETURN(FLOAT); }
251	__float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
252	float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
253	__float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
254	float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
255	_Float16 { FLOATXX(uFLOAT16); } // GCC
256	_Float32 { FLOATXX(uFLOAT32); } // GCC
257	_Float32x { FLOATXX(uFLOAT32X); } // GCC
258	_Float64 { FLOATXX(uFLOAT64); } // GCC
259	_Float64x { FLOATXX(uFLOAT64X); } // GCC
260	_Float128 { FLOATXX(uFLOAT128); } // GCC
261	_Float128x { FLOATXX(uFLOAT128); } // GCC
262	for { KEYWORD_RETURN(FOR); }
263	forall { KEYWORD_RETURN(FORALL); } // CFA
264	fortran { KEYWORD_RETURN(FORTRAN); }
265	ftype { KEYWORD_RETURN(FTYPE); } // CFA
266	generator { KEYWORD_RETURN(GENERATOR); } // CFA
267	_Generic { KEYWORD_RETURN(GENERIC); } // C11
268	goto { KEYWORD_RETURN(GOTO); }
269	if { KEYWORD_RETURN(IF); }
270	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
271	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
272	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
273	inline { KEYWORD_RETURN(INLINE); } // C99
274	__inline { KEYWORD_RETURN(INLINE); } // GCC
275	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
276	int { KEYWORD_RETURN(INT); }
277	int128 { KEYWORD_RETURN(INT128); } // CFA
278	__int128 { KEYWORD_RETURN(INT128); } // GCC
279	__int128_t { KEYWORD_RETURN(INT128); } // GCC
280	__label__ { KEYWORD_RETURN(LABEL); } // GCC
281	long { KEYWORD_RETURN(LONG); }
282	monitor { KEYWORD_RETURN(MONITOR); } // CFA
283	mutex { KEYWORD_RETURN(MUTEX); } // CFA
284	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
285	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
286	one_t { NUMERIC_RETURN(ONE_T); } // CFA
287	or { QKEYWORD_RETURN(WOR); } // CFA
288	otype { KEYWORD_RETURN(OTYPE); } // CFA
289	register { KEYWORD_RETURN(REGISTER); }
290	restrict { KEYWORD_RETURN(RESTRICT); } // C99
291	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
292	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
293	return { KEYWORD_RETURN(RETURN); }
294	/* resume { KEYWORD_RETURN(RESUME); } // CFA */
295	short { KEYWORD_RETURN(SHORT); }
296	signed { KEYWORD_RETURN(SIGNED); }
297	__signed { KEYWORD_RETURN(SIGNED); } // GCC
298	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
299	sizeof { KEYWORD_RETURN(SIZEOF); }
300	static { KEYWORD_RETURN(STATIC); }
301	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
302	struct { KEYWORD_RETURN(STRUCT); }
303	suspend { KEYWORD_RETURN(SUSPEND); } // CFA
304	switch { KEYWORD_RETURN(SWITCH); }
305	thread { KEYWORD_RETURN(THREAD); } // C11
306	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
307	throw { KEYWORD_RETURN(THROW); } // CFA
308	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
309	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
310	trait { KEYWORD_RETURN(TRAIT); } // CFA
311	try { KEYWORD_RETURN(TRY); } // CFA
312	ttype { KEYWORD_RETURN(TTYPE); } // CFA
313	typedef { KEYWORD_RETURN(TYPEDEF); }
314	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
315	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
316	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
317	union { KEYWORD_RETURN(UNION); }
318	__uint128_t { KEYWORD_RETURN(UINT128); } // GCC
319	unsigned { KEYWORD_RETURN(UNSIGNED); }
320	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
321	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
322	void { KEYWORD_RETURN(VOID); }
323	volatile { KEYWORD_RETURN(VOLATILE); }
324	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
325	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
326	waitfor { KEYWORD_RETURN(WAITFOR); }
327	when { KEYWORD_RETURN(WHEN); }
328	while { KEYWORD_RETURN(WHILE); }
329	with { KEYWORD_RETURN(WITH); } // CFA
330	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
331
332	/* identifier */
333	{identifier} { IDENTIFIER_RETURN(); }
334	"``"{identifier} { // CFA
335	yytext[yyleng] = '\0'; yytext += 2; // SKULLDUGGERY: remove backquotes (ok to shorten?)
336	IDENTIFIER_RETURN();
337	}
338
339	/* numeric constants */
340	{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
341	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
342	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
343	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
344	{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
345	{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
346	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
347	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
348
349	/* character constant, allows empty value */
350	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
351	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
352	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
353	/* ' stop editor highlighting */
354
355	/* string constant */
356	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
357	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
358	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
359	/* " stop editor highlighting */
360
361	/* common character/string constant */
362	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
363	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
364	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
365
366	/* punctuation */
367	"@" { ASCIIOP_RETURN(); }
368	"`" { ASCIIOP_RETURN(); }
369	"[" { ASCIIOP_RETURN(); }
370	"]" { ASCIIOP_RETURN(); }
371	"(" { ASCIIOP_RETURN(); }
372	")" { ASCIIOP_RETURN(); }
373	"{" { ASCIIOP_RETURN(); }
374	"}" { ASCIIOP_RETURN(); }
375	"," { ASCIIOP_RETURN(); } // also operator
376	":" { ASCIIOP_RETURN(); }
377	";" { ASCIIOP_RETURN(); }
378	"." { ASCIIOP_RETURN(); } // also operator
379	"..." { NAMEDOP_RETURN(ELLIPSIS); }
380
381	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
382	"<:" { RETURN_VAL('['); }
383	":>" { RETURN_VAL(']'); }
384	"<%" { RETURN_VAL('{'); }
385	"%>" { RETURN_VAL('}'); }
386
387	/* operators */
388	"!" { ASCIIOP_RETURN(); }
389	"+" { ASCIIOP_RETURN(); }
390	"-" { ASCIIOP_RETURN(); }
391	"*" { ASCIIOP_RETURN(); }
392	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
393	"/" { ASCIIOP_RETURN(); }
394	"%" { ASCIIOP_RETURN(); }
395	"^" { ASCIIOP_RETURN(); }
396	"~" { ASCIIOP_RETURN(); }
397	"&" { ASCIIOP_RETURN(); }
398	"\|" { ASCIIOP_RETURN(); }
399	"<" { ASCIIOP_RETURN(); }
400	">" { ASCIIOP_RETURN(); }
401	"=" { ASCIIOP_RETURN(); }
402	"?" { ASCIIOP_RETURN(); }
403
404	"++" { NAMEDOP_RETURN(ICR); }
405	"--" { NAMEDOP_RETURN(DECR); }
406	"==" { NAMEDOP_RETURN(EQ); }
407	"!=" { NAMEDOP_RETURN(NE); }
408	"<<" { NAMEDOP_RETURN(LS); }
409	">>" { NAMEDOP_RETURN(RS); }
410	"<=" { NAMEDOP_RETURN(LE); }
411	">=" { NAMEDOP_RETURN(GE); }
412	"&&" { NAMEDOP_RETURN(ANDAND); }
413	"\|\|" { NAMEDOP_RETURN(OROR); }
414	"->" { NAMEDOP_RETURN(ARROW); }
415	"+=" { NAMEDOP_RETURN(PLUSassign); }
416	"-=" { NAMEDOP_RETURN(MINUSassign); }
417	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
418	"*=" { NAMEDOP_RETURN(MULTassign); }
419	"/=" { NAMEDOP_RETURN(DIVassign); }
420	"%=" { NAMEDOP_RETURN(MODassign); }
421	"&=" { NAMEDOP_RETURN(ANDassign); }
422	"\|=" { NAMEDOP_RETURN(ORassign); }
423	"^=" { NAMEDOP_RETURN(ERassign); }
424	"<<=" { NAMEDOP_RETURN(LSassign); }
425	">>=" { NAMEDOP_RETURN(RSassign); }
426
427	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
428	"~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
429	"-~" { NAMEDOP_RETURN(ErangeDown); } // CFA
430	"-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA
431
432	/* CFA, operator identifier */
433	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
434	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
435	"^?{}" { IDENTIFIER_RETURN(); }
436	"?`"{identifier} { // postfix operator
437	yylval.tok.str = new string( &yytext[2] ); // remove ?`
438	yylval.tok.str = build_postfix_name( yylval.tok.str ); // add prefix
439	RETURN_LOCN( typedefTable.isKind( *yylval.tok.str ) );
440	}
441	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
442	/*
443	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
444	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
445	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
446	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
447	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
448	identifier to disambiguate this common case.
449
450	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
451	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
452	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
453	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
454	any meaningful program.
455
456	The remaining cases are with the increment/decrement operators and conditional expression:
457
458	i++? ...(...);
459	i?++ ...(...);
460
461	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
462	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
463	space:
464
465	i++ ? i : 0;
466	i? ++i : 0;
467	*/
468	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
469	// 1 or 2 character unary operator ?
470	int i = yytext[1] == '?' ? 1 : 2;
471	yyless( i ); // put back characters up to first '?'
472	if ( i > 1 ) {
473	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
474	} else {
475	ASCIIOP_RETURN();
476	} // if
477	}
478
479	/* unknown character */
480	. { yyerror( "unknown character" ); }
481
482	%%
483
484	// ----end of lexer----
485
486	void yyerror( const char * errmsg ) {
487	SemanticErrorThrow = true;
488	cerr << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
489	<< ": " << ErrorHelpers::error_str() << errmsg << " at token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
490	}
491
492	// Local Variables: //
493	// mode: c++ //
494	// tab-width: 4 //
495	// compile-command: "make install" //
496	// End: //

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