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lex.ll @ 62e782e

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsdeferred_resnenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprno_listpersistent-indexerpthread-emulationqualifiedEnum

Last change on this file since 62e782e was cc22003, checked in by Peter A. Buhr <pabuhr@…>, 6 years ago
second attempt to at extended for-ctrl
Property mode set to `100644`
File size: 18.5 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 8 17:23:17 2018
13	* Update Count : 685
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 "ParseNode.h"
42	#include "TypedefTable.h"
43
44	char *yyfilename;
45	string *strtext; // accumulate parts of character and string constant value
46
47	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
48	#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
49	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
50	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
51
52	#define WHITE_RETURN(x) // do nothing
53	#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
54	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
55	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
56	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
57	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
58	#define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword
59	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
60	#define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER )
61
62	void rm_underscore() {
63	// SKULLDUGGERY: remove underscores (ok to shorten?)
64	yyleng = 0;
65	for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string
66	if ( yytext[i] != '_' ) {
67	yytext[yyleng] = yytext[i];
68	yyleng += 1;
69	} // if
70	} // for
71	yytext[yyleng] = '\0';
72	} // rm_underscore
73
74	// Stop warning due to incorrectly generated flex code.
75	#pragma GCC diagnostic ignored "-Wsign-compare"
76	%}
77
78	binary [0-1]
79	octal [0-7]
80	nonzero [1-9]
81	decimal [0-9]
82	hex [0-9a-fA-F]
83	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
84
85	// identifier, GCC: $ in identifier
86	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
87
88	// attribute identifier, GCC: $ in identifier
89	attr_identifier "@"{identifier}
90
91	// numeric constants, CFA: '_' in constant
92	hex_quad {hex}("_"?{hex}){3}
93	size_opt (8\|16\|32\|64\|128)?
94	length ("ll"\|"LL"\|[lL]{size_opt})\|("hh"\|"HH"\|[hH])
95	integer_suffix_opt ("_"?(([uU]({length}?[iI]?)\|([iI]{length}))\|([iI]({length}?[uU]?)\|([uU]{length}))\|({length}([iI]?[uU]?)\|([uU][iI]))\|[zZ]))?
96
97	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
98	octal_prefix "0""_"?
99	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix_opt}
100
101	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
102	decimal_constant {nonzero_digits}{integer_suffix_opt}
103
104	binary_digits ({binary})\|({binary}({binary}\|"_")*{binary})
105	binary_prefix "0"[bB]"_"?
106	binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt}
107
108	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
109	hex_prefix "0"[xX]"_"?
110	hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
111
112	// GCC: D (double) and iI (imaginary) suffixes, and DL (long double)
113	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
114	floating_size 32\|64\|80\|128
115	floating_length ([fFdDlL]\|[lL]{floating_size})
116	floating_suffix ({floating_length}?[iI]?)\|([iI]{floating_length})
117	floating_suffix_opt ("_"?({floating_suffix}\|"DL"))?
118	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
119	floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
120	floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
121	floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})\|({decimal_digits}{floating_fraction})
122
123	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
124	hex_floating_suffix_opt ("_"?({floating_suffix}))?
125	hex_floating_fraction ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
126	hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})\|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
127
128	// character escape sequence, GCC: \e => esc character
129	simple_escape "\\"[abefnrtv'"?\\]
130	// ' stop editor highlighting
131	octal_escape "\\"{octal}("_"?{octal}){0,2}
132	hex_escape "\\""x""_"?{hex_digits}
133	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
134	cwide_prefix "L"\|"U"\|"u"
135	swide_prefix {cwide_prefix}\|"u8"
136
137	// display/white-space characters
138	h_tab [\011]
139	form_feed [\014]
140	v_tab [\013]
141	c_return [\015]
142	h_white [ ]\|{h_tab}
143
144	// overloadable operators
145	op_unary_only "~"\|"!"
146	op_unary_binary "+"\|"-"\|"*"
147	op_unary_pre_post "++"\|"--"
148	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
149
150	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
151	op_binary_over {op_unary_binary}\|{op_binary_only}
152	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
153	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
154
155	%x COMMENT
156	%x BKQUOTE
157	%x QUOTE
158	%x STRING
159
160	%%
161	/* line directives */
162	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
163	/* " stop editor highlighting */
164	static char filename[FILENAME_MAX]; // temporarily store current source-file name
165	char *end_num;
166	char begin_string, end_string;
167	long lineno, length;
168	lineno = strtol( yytext + 1, &end_num, 0 );
169	begin_string = strchr( end_num, '"' );
170	if ( begin_string ) { // file name ?
171	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
172	assert( end_string ); // closing quote ?
173	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
174	assert( length < FILENAME_MAX ); // room for sentinel ?
175	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
176	filename[ length ] = '\0'; // terminate string with sentinel
177	//cout << "file " << filename << " line " << lineno << endl;
178	yylineno = lineno;
179	yyfilename = filename;
180	} // if
181	}
182
183	/* preprocessor-style directives */
184	^{h_white}"#"[^\n]"\n" { RETURN_VAL( DIRECTIVE ); }
185
186	/* ignore C style comments (ALSO HANDLED BY CPP) */
187	"/*" { BEGIN COMMENT; }
188	<COMMENT>.\|\n ;
189	<COMMENT>"*/" { BEGIN 0; }
190
191	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
192	"//"[^\n]*"\n" ;
193
194	/* ignore whitespace */
195	{h_white}+ { WHITE_RETURN(' '); }
196	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
197	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
198
199	/* keywords */
200	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
201	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
202	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
203	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
204	asm { KEYWORD_RETURN(ASM); }
205	__asm { KEYWORD_RETURN(ASM); } // GCC
206	__asm__ { KEYWORD_RETURN(ASM); } // GCC
207	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
208	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
209	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
210	auto { KEYWORD_RETURN(AUTO); }
211	_Bool { KEYWORD_RETURN(BOOL); } // C99
212	break { KEYWORD_RETURN(BREAK); }
213	case { KEYWORD_RETURN(CASE); }
214	catch { KEYWORD_RETURN(CATCH); } // CFA
215	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
216	char { KEYWORD_RETURN(CHAR); }
217	choose { KEYWORD_RETURN(CHOOSE); } // CFA
218	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
219	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
220	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
221	const { KEYWORD_RETURN(CONST); }
222	__const { KEYWORD_RETURN(CONST); } // GCC
223	__const__ { KEYWORD_RETURN(CONST); } // GCC
224	continue { KEYWORD_RETURN(CONTINUE); }
225	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
226	default { KEYWORD_RETURN(DEFAULT); }
227	disable { KEYWORD_RETURN(DISABLE); } // CFA
228	do { KEYWORD_RETURN(DO); }
229	double { KEYWORD_RETURN(DOUBLE); }
230	dtype { KEYWORD_RETURN(DTYPE); } // CFA
231	else { KEYWORD_RETURN(ELSE); }
232	enable { KEYWORD_RETURN(ENABLE); } // CFA
233	enum { KEYWORD_RETURN(ENUM); }
234	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
235	exception { KEYWORD_RETURN(EXCEPTION); } // CFA
236	extern { KEYWORD_RETURN(EXTERN); }
237	fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
238	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
239	finally { KEYWORD_RETURN(FINALLY); } // CFA
240	float { KEYWORD_RETURN(FLOAT); }
241	_Float32 { KEYWORD_RETURN(FLOAT); } // GCC
242	_Float32x { KEYWORD_RETURN(FLOAT); } // GCC
243	_Float64 { KEYWORD_RETURN(DOUBLE); } // GCC
244	_Float64x { KEYWORD_RETURN(DOUBLE); } // GCC
245	__float80 { KEYWORD_RETURN(FLOAT80); } // GCC
246	float80 { KEYWORD_RETURN(FLOAT80); } // GCC
247	_Float128 { KEYWORD_RETURN(FLOAT128); } // GCC
248	_Float128x { KEYWORD_RETURN(FLOAT128); } // GCC
249	__float128 { KEYWORD_RETURN(FLOAT128); } // GCC
250	float128 { KEYWORD_RETURN(FLOAT128); } // GCC
251	for { KEYWORD_RETURN(FOR); }
252	forall { KEYWORD_RETURN(FORALL); } // CFA
253	fortran { KEYWORD_RETURN(FORTRAN); }
254	ftype { KEYWORD_RETURN(FTYPE); } // CFA
255	_Generic { KEYWORD_RETURN(GENERIC); } // C11
256	goto { KEYWORD_RETURN(GOTO); }
257	if { KEYWORD_RETURN(IF); }
258	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
259	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
260	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
261	inline { KEYWORD_RETURN(INLINE); } // C99
262	__inline { KEYWORD_RETURN(INLINE); } // GCC
263	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
264	int { KEYWORD_RETURN(INT); }
265	__int128 { KEYWORD_RETURN(INT128); } // GCC
266	int128 { KEYWORD_RETURN(INT128); } // GCC
267	__label__ { KEYWORD_RETURN(LABEL); } // GCC
268	long { KEYWORD_RETURN(LONG); }
269	monitor { KEYWORD_RETURN(MONITOR); } // CFA
270	mutex { KEYWORD_RETURN(MUTEX); } // CFA
271	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
272	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
273	one_t { NUMERIC_RETURN(ONE_T); } // CFA
274	or { QKEYWORD_RETURN(WOR); } // CFA
275	otype { KEYWORD_RETURN(OTYPE); } // CFA
276	register { KEYWORD_RETURN(REGISTER); }
277	restrict { KEYWORD_RETURN(RESTRICT); } // C99
278	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
279	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
280	return { KEYWORD_RETURN(RETURN); }
281	short { KEYWORD_RETURN(SHORT); }
282	signed { KEYWORD_RETURN(SIGNED); }
283	__signed { KEYWORD_RETURN(SIGNED); } // GCC
284	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
285	sizeof { KEYWORD_RETURN(SIZEOF); }
286	static { KEYWORD_RETURN(STATIC); }
287	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
288	struct { KEYWORD_RETURN(STRUCT); }
289	switch { KEYWORD_RETURN(SWITCH); }
290	thread { KEYWORD_RETURN(THREAD); } // C11
291	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
292	throw { KEYWORD_RETURN(THROW); } // CFA
293	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
294	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
295	trait { KEYWORD_RETURN(TRAIT); } // CFA
296	try { KEYWORD_RETURN(TRY); } // CFA
297	ttype { KEYWORD_RETURN(TTYPE); } // CFA
298	typedef { KEYWORD_RETURN(TYPEDEF); }
299	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
300	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
301	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
302	union { KEYWORD_RETURN(UNION); }
303	unsigned { KEYWORD_RETURN(UNSIGNED); }
304	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
305	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
306	void { KEYWORD_RETURN(VOID); }
307	volatile { KEYWORD_RETURN(VOLATILE); }
308	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
309	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
310	waitfor { KEYWORD_RETURN(WAITFOR); }
311	when { KEYWORD_RETURN(WHEN); }
312	while { KEYWORD_RETURN(WHILE); }
313	with { KEYWORD_RETURN(WITH); } // CFA
314	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
315
316	/* identifier */
317	{identifier} { IDENTIFIER_RETURN(); }
318	"`"{identifier}"`" { // CFA
319	yytext[yyleng - 1] = '\0'; yytext += 1; // SKULLDUGGERY: remove backquotes (ok to shorten?)
320	IDENTIFIER_RETURN();
321	}
322	{attr_identifier} { ATTRIBUTE_RETURN(); }
323
324	/* numeric constants */
325	{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
326	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
327	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
328	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
329	{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
330	{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
331	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
332	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
333
334	/* character constant, allows empty value */
335	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
336	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
337	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
338	/* ' stop editor highlighting */
339
340	/* string constant */
341	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
342	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
343	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
344	/* " stop editor highlighting */
345
346	/* common character/string constant */
347	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
348	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
349	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
350
351	/* punctuation */
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	"," { ASCIIOP_RETURN(); } // also operator
361	":" { ASCIIOP_RETURN(); }
362	";" { ASCIIOP_RETURN(); }
363	"." { ASCIIOP_RETURN(); } // also operator
364	"..." { NAMEDOP_RETURN(ELLIPSIS); }
365
366	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
367	"<:" { RETURN_VAL('['); }
368	":>" { RETURN_VAL(']'); }
369	"<%" { RETURN_VAL('{'); }
370	"%>" { RETURN_VAL('}'); }
371
372	/* operators */
373	"!" { ASCIIOP_RETURN(); }
374	"+" { ASCIIOP_RETURN(); }
375	"-" { ASCIIOP_RETURN(); }
376	"*" { ASCIIOP_RETURN(); }
377	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
378	"/" { ASCIIOP_RETURN(); }
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(); }
388
389	"++" { NAMEDOP_RETURN(ICR); }
390	"--" { NAMEDOP_RETURN(DECR); }
391	"==" { NAMEDOP_RETURN(EQ); }
392	"!=" { NAMEDOP_RETURN(NE); }
393	"<<" { NAMEDOP_RETURN(LS); }
394	">>" { NAMEDOP_RETURN(RS); }
395	"<=" { NAMEDOP_RETURN(LE); }
396	">=" { NAMEDOP_RETURN(GE); }
397	"&&" { NAMEDOP_RETURN(ANDAND); }
398	"\|\|" { NAMEDOP_RETURN(OROR); }
399	"->" { NAMEDOP_RETURN(ARROW); }
400	"+=" { NAMEDOP_RETURN(PLUSassign); }
401	"-=" { NAMEDOP_RETURN(MINUSassign); }
402	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
403	"*=" { NAMEDOP_RETURN(MULTassign); }
404	"/=" { NAMEDOP_RETURN(DIVassign); }
405	"%=" { NAMEDOP_RETURN(MODassign); }
406	"&=" { NAMEDOP_RETURN(ANDassign); }
407	"\|=" { NAMEDOP_RETURN(ORassign); }
408	"^=" { NAMEDOP_RETURN(ERassign); }
409	"<<=" { NAMEDOP_RETURN(LSassign); }
410	">>=" { NAMEDOP_RETURN(RSassign); }
411
412	"~=" { NAMEDOP_RETURN(Erange); } // CFA
413	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
414
415	/* CFA, operator identifier */
416	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
417	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
418	"^?{}" { IDENTIFIER_RETURN(); }
419	"?`"{identifier} { IDENTIFIER_RETURN(); } // postfix operator
420	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
421	/*
422	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
423	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
424	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
425	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
426	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
427	identifier to disambiguate this common case.
428
429	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
430	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
431	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
432	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
433	any meaningful program.
434
435	The remaining cases are with the increment/decrement operators and conditional expression:
436
437	i++? ...(...);
438	i?++ ...(...);
439
440	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
441	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
442	space:
443
444	i++ ? i : 0;
445	i? ++i : 0;
446	*/
447	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
448	// 1 or 2 character unary operator ?
449	int i = yytext[1] == '?' ? 1 : 2;
450	yyless( i ); // put back characters up to first '?'
451	if ( i > 1 ) {
452	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
453	} else {
454	ASCIIOP_RETURN();
455	} // if
456	}
457
458	/* unknown character */
459	. { yyerror( "unknown character" ); }
460
461	%%
462
463	// ----end of lexer----
464
465	void yyerror( const char * errmsg ) {
466	SemanticErrorThrow = true;
467	cerr << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
468	<< ": " << ErrorHelpers::error_str() << errmsg << " at token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
469	}
470
471	// Local Variables: //
472	// mode: c++ //
473	// tab-width: 4 //
474	// compile-command: "make install" //
475	// End: //

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