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lex.ll @ 60f4919

Last change on this file since 60f4919 was 01fac29, checked in by Peter A. Buhr <pabuhr@…>, 17 months ago
lex _static_assert from C23
Property mode set to `100644`
File size: 20.7 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 : Fri Jun 9 10:04:00 2023
13	* Update Count : 770
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 "DeclarationNode.h" // for DeclarationNode
47	#include "ExpressionNode.h" // for LabelNode
48	#include "InitializerNode.h" // for InitializerNode
49	#include "ParseNode.h"
50	#include "ParserTypes.h" // for Token
51	#include "StatementNode.h" // for CondCtl, ForCtrl
52	#include "TypedefTable.h"
53	// This (generated) header must come late as it is missing includes.
54	#include "parser.hh" // generated info
55
56	string * build_postfix_name( string * name );
57
58	char *yyfilename;
59	string *strtext; // accumulate parts of character and string constant value
60
61	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
62	#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
63	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
64	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
65
66	#define WHITE_RETURN(x) // do nothing
67	#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
68	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
69	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
70	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
71	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
72	#define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword
73	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
74
75	#ifdef HAVE_KEYWORDS_FLOATXX // GCC >= 7 => keyword, otherwise typedef
76	#define FLOATXX(v) KEYWORD_RETURN(v);
77	#else
78	#define FLOATXX(v) IDENTIFIER_RETURN();
79	#endif // HAVE_KEYWORDS_FLOATXX
80
81	void rm_underscore() {
82	// SKULLDUGGERY: remove underscores (ok to shorten?)
83	yyleng = 0;
84	for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string
85	if ( yytext[i] != '_' ) {
86	yytext[yyleng] = yytext[i];
87	yyleng += 1;
88	} // if
89	} // for
90	yytext[yyleng] = '\0';
91	} // rm_underscore
92
93	// Stop warning due to incorrectly generated flex code.
94	#pragma GCC diagnostic ignored "-Wsign-compare"
95	%}
96
97	binary [0-1]
98	octal [0-7]
99	nonzero [1-9]
100	decimal [0-9]
101	hex [0-9a-fA-F]
102	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
103
104	// identifier, GCC: $ in identifier
105	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
106
107	// numeric constants, CFA: '_' in constant
108	hex_quad {hex}("_"?{hex}){3}
109	size_opt (8\|16\|32\|64\|128)?
110	// CFA: explicit l8/l16/l32/l64/l128, char 'hh', short 'h', int 'n'
111	length ("ll"\|"LL"\|[lL]{size_opt})\|("hh"\|"HH"\|[hHnN])
112	// CFA: size_t 'z', pointer 'p', which define a sign and length
113	integer_suffix_opt ("_"?(([uU]({length}?[iI]?)\|([iI]{length}))\|([iI]({length}?[uU]?)\|([uU]{length}))\|({length}([iI]?[uU]?)\|([uU][iI]))\|[zZ]\|[pP]))?
114
115	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
116	octal_prefix "0""_"?
117	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix_opt}
118
119	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
120	decimal_constant {nonzero_digits}{integer_suffix_opt}
121
122	binary_digits ({binary})\|({binary}({binary}\|"_")*{binary})
123	binary_prefix "0"[bB]"_"?
124	binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt}
125
126	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
127	hex_prefix "0"[xX]"_"?
128	hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
129
130	// GCC: floating D (double), imaginary iI, and decimal floating DF, DD, DL
131	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
132	floating_size 16\|32\|32x\|64\|64x\|80\|128\|128x
133	floating_length ([fFdDlLwWqQ]\|[fF]{floating_size})
134	floating_suffix ({floating_length}?[iI]?)\|([iI]{floating_length})
135	decimal_floating_suffix [dD][fFdDlL]
136	floating_suffix_opt ("_"?({floating_suffix}\|{decimal_floating_suffix}))?
137	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
138	floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
139	floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
140	floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})\|({decimal_digits}{floating_fraction})
141
142	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
143	hex_floating_suffix_opt ("_"?({floating_suffix}))?
144	hex_floating_fraction ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
145	hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})\|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
146
147	// character escape sequence, GCC: \e => esc character
148	simple_escape "\\"[abefnrtv'"?\\]
149	// ' stop editor highlighting
150	octal_escape "\\"{octal}("_"?{octal}){0,2}
151	hex_escape "\\""x""_"?{hex_digits}
152	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
153	cwide_prefix "L"\|"U"\|"u"
154	swide_prefix {cwide_prefix}\|"u8"
155
156	// display/white-space characters
157	h_tab [\011]
158	form_feed [\014]
159	v_tab [\013]
160	c_return [\015]
161	h_white [ ]\|{h_tab}
162
163	// overloadable operators
164	op_unary_only "~"\|"!"
165	op_unary_binary "+"\|"-"\|"*"
166	op_unary_pre_post "++"\|"--"
167	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
168
169	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
170	op_binary_over {op_unary_binary}\|{op_binary_only}
171	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
172	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
173
174	%x COMMENT
175	%x BKQUOTE
176	%x QUOTE
177	%x STRING
178
179	%%
180	/* line directives */
181	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
182	/* " stop editor highlighting */
183	static char filename[FILENAME_MAX]; // temporarily store current source-file name
184	char *end_num;
185	char begin_string, end_string;
186	long lineno, length;
187	lineno = strtol( yytext + 1, &end_num, 0 );
188	begin_string = strchr( end_num, '"' );
189	if ( begin_string ) { // file name ?
190	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
191	assert( end_string ); // closing quote ?
192	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
193	assert( length < FILENAME_MAX ); // room for sentinel ?
194	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
195	filename[ length ] = '\0'; // terminate string with sentinel
196	//cout << "file " << filename << " line " << lineno << endl;
197	yylineno = lineno;
198	yyfilename = filename;
199	} // if
200	}
201
202	/* preprocessor-style directives */
203	^{h_white}"#"[^\n]"\n" { RETURN_VAL( DIRECTIVE ); }
204
205	/* ignore C style comments (ALSO HANDLED BY CPP) */
206	"/*" { BEGIN COMMENT; }
207	<COMMENT>.\|\n ;
208	<COMMENT>"*/" { BEGIN 0; }
209
210	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
211	"//"[^\n]*"\n" ;
212
213	/* ignore whitespace */
214	{h_white}+ { WHITE_RETURN(' '); }
215	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
216	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
217
218	/* keywords */
219	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
220	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
221	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
222	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
223	and { QKEYWORD_RETURN(WAND); } // CFA
224	asm { KEYWORD_RETURN(ASM); }
225	__asm { KEYWORD_RETURN(ASM); } // GCC
226	__asm__ { KEYWORD_RETURN(ASM); } // GCC
227	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
228	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
229	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
230	auto { KEYWORD_RETURN(AUTO); }
231	__auto_type { KEYWORD_RETURN(AUTO_TYPE); }
232	basetypeof { KEYWORD_RETURN(BASETYPEOF); } // CFA
233	_Bool { KEYWORD_RETURN(BOOL); } // C99
234	break { KEYWORD_RETURN(BREAK); }
235	case { KEYWORD_RETURN(CASE); }
236	catch { QKEYWORD_RETURN(CATCH); } // CFA
237	catchResume { QKEYWORD_RETURN(CATCHRESUME); } // CFA
238	char { KEYWORD_RETURN(CHAR); }
239	choose { KEYWORD_RETURN(CHOOSE); } // CFA
240	coerce { KEYWORD_RETURN(COERCE); } // CFA
241	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
242	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
243	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
244	const { KEYWORD_RETURN(CONST); }
245	__const { KEYWORD_RETURN(CONST); } // GCC
246	__const__ { KEYWORD_RETURN(CONST); } // GCC
247	continue { KEYWORD_RETURN(CONTINUE); }
248	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
249	_Decimal32 { KEYWORD_RETURN(DECIMAL32); } // GCC
250	_Decimal64 { KEYWORD_RETURN(DECIMAL64); } // GCC
251	_Decimal128 { KEYWORD_RETURN(DECIMAL128); } // GCC
252	default { KEYWORD_RETURN(DEFAULT); }
253	disable { KEYWORD_RETURN(DISABLE); } // CFA
254	do { KEYWORD_RETURN(DO); }
255	double { KEYWORD_RETURN(DOUBLE); }
256	dtype { KEYWORD_RETURN(DTYPE); } // CFA
257	else { KEYWORD_RETURN(ELSE); }
258	enable { KEYWORD_RETURN(ENABLE); } // CFA
259	enum { KEYWORD_RETURN(ENUM); }
260	exception { KEYWORD_RETURN(EXCEPTION); } // CFA
261	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
262	extern { KEYWORD_RETURN(EXTERN); }
263	fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
264	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
265	finally { QKEYWORD_RETURN(FINALLY); } // CFA
266	fixup { QKEYWORD_RETURN(FIXUP); } // CFA
267	float { KEYWORD_RETURN(FLOAT); }
268	__float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
269	float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
270	__float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
271	float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
272	_Float16 { FLOATXX(uFLOAT16); } // GCC
273	_Float32 { FLOATXX(uFLOAT32); } // GCC
274	_Float32x { FLOATXX(uFLOAT32X); } // GCC
275	_Float64 { FLOATXX(uFLOAT64); } // GCC
276	_Float64x { FLOATXX(uFLOAT64X); } // GCC
277	_Float128 { FLOATXX(uFLOAT128); } // GCC
278	_Float128x { FLOATXX(uFLOAT128); } // GCC
279	for { KEYWORD_RETURN(FOR); }
280	forall { KEYWORD_RETURN(FORALL); } // CFA
281	fortran { KEYWORD_RETURN(FORTRAN); }
282	ftype { KEYWORD_RETURN(FTYPE); } // CFA
283	generator { KEYWORD_RETURN(GENERATOR); } // CFA
284	_Generic { KEYWORD_RETURN(GENERIC); } // C11
285	goto { KEYWORD_RETURN(GOTO); }
286	if { KEYWORD_RETURN(IF); }
287	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
288	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
289	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
290	inline { KEYWORD_RETURN(INLINE); } // C99
291	__inline { KEYWORD_RETURN(INLINE); } // GCC
292	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
293	int { KEYWORD_RETURN(INT); }
294	int128 { KEYWORD_RETURN(INT128); } // CFA
295	__int128 { KEYWORD_RETURN(INT128); } // GCC
296	__int128_t { KEYWORD_RETURN(INT128); } // GCC
297	__label__ { KEYWORD_RETURN(LABEL); } // GCC
298	long { KEYWORD_RETURN(LONG); }
299	monitor { KEYWORD_RETURN(MONITOR); } // CFA
300	mutex { KEYWORD_RETURN(MUTEX); } // CFA
301	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
302	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
303	one_t { NUMERIC_RETURN(ONE_T); } // CFA
304	or { QKEYWORD_RETURN(WOR); } // CFA
305	otype { KEYWORD_RETURN(OTYPE); } // CFA
306	recover { QKEYWORD_RETURN(RECOVER); } // CFA
307	register { KEYWORD_RETURN(REGISTER); }
308	report { KEYWORD_RETURN(THROWRESUME); } // CFA
309	restrict { KEYWORD_RETURN(RESTRICT); } // C99
310	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
311	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
312	return { KEYWORD_RETURN(RETURN); }
313	/* resume { KEYWORD_RETURN(RESUME); } // CFA */
314	short { KEYWORD_RETURN(SHORT); }
315	signed { KEYWORD_RETURN(SIGNED); }
316	__signed { KEYWORD_RETURN(SIGNED); } // GCC
317	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
318	sizeof { KEYWORD_RETURN(SIZEOF); }
319	static { KEYWORD_RETURN(STATIC); }
320	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
321	_static_assert { KEYWORD_RETURN(STATICASSERT); } // C23
322	struct { KEYWORD_RETURN(STRUCT); }
323	suspend { KEYWORD_RETURN(SUSPEND); } // CFA
324	switch { KEYWORD_RETURN(SWITCH); }
325	thread { KEYWORD_RETURN(THREAD); } // C11
326	__thread { KEYWORD_RETURN(THREADLOCALGCC); } // GCC
327	_Thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C11
328	throw { KEYWORD_RETURN(THROW); } // CFA
329	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
330	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
331	trait { KEYWORD_RETURN(TRAIT); } // CFA
332	try { KEYWORD_RETURN(TRY); } // CFA
333	ttype { KEYWORD_RETURN(TTYPE); } // CFA
334	typedef { KEYWORD_RETURN(TYPEDEF); }
335	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
336	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
337	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
338	typeid { KEYWORD_RETURN(TYPEID); } // GCC
339	union { KEYWORD_RETURN(UNION); }
340	__uint128_t { KEYWORD_RETURN(UINT128); } // GCC
341	unsigned { KEYWORD_RETURN(UNSIGNED); }
342	__builtin_va_arg { KEYWORD_RETURN(VA_ARG); } // GCC
343	__builtin_va_list { KEYWORD_RETURN(VA_LIST); } // GCC
344	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
345	void { KEYWORD_RETURN(VOID); }
346	volatile { KEYWORD_RETURN(VOLATILE); }
347	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
348	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
349	vtable { KEYWORD_RETURN(VTABLE); } // CFA
350	waitfor { KEYWORD_RETURN(WAITFOR); } // CFA
351	waituntil { KEYWORD_RETURN(WAITUNTIL); } // CFA
352	when { KEYWORD_RETURN(WHEN); } // CFA
353	while { KEYWORD_RETURN(WHILE); }
354	with { KEYWORD_RETURN(WITH); } // CFA
355	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
356
357	/* identifier */
358	{identifier} { IDENTIFIER_RETURN(); }
359	"``"{identifier} { // CFA
360	yytext[yyleng] = '\0'; yytext += 2; // SKULLDUGGERY: remove backquotes (ok to shorten?)
361	IDENTIFIER_RETURN();
362	}
363
364	/* numeric constants */
365	{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
366	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
367	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
368	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
369	{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
370	{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
371	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
372	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
373
374	/* character constant, allows empty value */
375	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
376	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
377	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
378	/* ' stop editor highlighting */
379
380	/* string constant */
381	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
382	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
383	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
384	/* " stop editor highlighting */
385
386	/* common character/string constant */
387	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
388	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
389	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
390
391	/* punctuation */
392	"@" { ASCIIOP_RETURN(); }
393	"`" { ASCIIOP_RETURN(); }
394	"[" { ASCIIOP_RETURN(); }
395	"]" { ASCIIOP_RETURN(); }
396	"(" { ASCIIOP_RETURN(); }
397	")" { ASCIIOP_RETURN(); }
398	"{" { ASCIIOP_RETURN(); }
399	"}" { ASCIIOP_RETURN(); }
400	"," { ASCIIOP_RETURN(); } // also operator
401	":" { ASCIIOP_RETURN(); }
402	";" { ASCIIOP_RETURN(); }
403	"." { ASCIIOP_RETURN(); } // also operator
404	"..." { NAMEDOP_RETURN(ELLIPSIS); }
405
406	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
407	"<:" { RETURN_VAL('['); }
408	":>" { RETURN_VAL(']'); }
409	"<%" { RETURN_VAL('{'); }
410	"%>" { RETURN_VAL('}'); }
411
412	/* operators */
413	"!" { ASCIIOP_RETURN(); }
414	"+" { ASCIIOP_RETURN(); }
415	"-" { ASCIIOP_RETURN(); }
416	"*" { ASCIIOP_RETURN(); }
417	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
418	"/" { ASCIIOP_RETURN(); }
419	"%" { ASCIIOP_RETURN(); }
420	"^" { ASCIIOP_RETURN(); }
421	"~" { ASCIIOP_RETURN(); }
422	"&" { ASCIIOP_RETURN(); }
423	"\|" { ASCIIOP_RETURN(); }
424	"<" { ASCIIOP_RETURN(); }
425	">" { ASCIIOP_RETURN(); }
426	"=" { ASCIIOP_RETURN(); }
427	"?" { ASCIIOP_RETURN(); }
428
429	"++" { NAMEDOP_RETURN(ICR); }
430	"--" { NAMEDOP_RETURN(DECR); }
431	"==" { NAMEDOP_RETURN(EQ); }
432	"!=" { NAMEDOP_RETURN(NE); }
433	"<<" { NAMEDOP_RETURN(LS); }
434	">>" { NAMEDOP_RETURN(RS); }
435	"<=" { NAMEDOP_RETURN(LE); }
436	">=" { NAMEDOP_RETURN(GE); }
437	"&&" { NAMEDOP_RETURN(ANDAND); }
438	"\|\|" { NAMEDOP_RETURN(OROR); }
439	"->" { NAMEDOP_RETURN(ARROW); }
440	"+=" { NAMEDOP_RETURN(PLUSassign); }
441	"-=" { NAMEDOP_RETURN(MINUSassign); }
442	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
443	"*=" { NAMEDOP_RETURN(MULTassign); }
444	"/=" { NAMEDOP_RETURN(DIVassign); }
445	"%=" { NAMEDOP_RETURN(MODassign); }
446	"&=" { NAMEDOP_RETURN(ANDassign); }
447	"\|=" { NAMEDOP_RETURN(ORassign); }
448	"^=" { NAMEDOP_RETURN(ERassign); }
449	"<<=" { NAMEDOP_RETURN(LSassign); }
450	">>=" { NAMEDOP_RETURN(RSassign); }
451
452	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
453	"~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
454	"-~" { NAMEDOP_RETURN(ErangeDown); } // CFA
455	"-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA
456
457	/* CFA, operator identifier */
458	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
459	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
460	"^?{}" { IDENTIFIER_RETURN(); }
461	"?`"{identifier} { // postfix operator
462	yylval.tok.str = new string( &yytext[2] ); // remove ?`
463	yylval.tok.str = build_postfix_name( yylval.tok.str ); // add prefix
464	RETURN_LOCN( typedefTable.isKind( *yylval.tok.str ) );
465	}
466	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
467	/*
468	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
469	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
470	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
471	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
472	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
473	identifier to disambiguate this common case.
474
475	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
476	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
477	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
478	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
479	any meaningful program.
480
481	The remaining cases are with the increment/decrement operators and conditional expression:
482
483	i++? ...(...);
484	i?++ ...(...);
485
486	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
487	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
488	space:
489
490	i++ ? i : 0;
491	i? ++i : 0;
492	*/
493	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
494	// 1 or 2 character unary operator ?
495	int i = yytext[1] == '?' ? 1 : 2;
496	yyless( i ); // put back characters up to first '?'
497	if ( i > 1 ) {
498	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
499	} else {
500	ASCIIOP_RETURN();
501	} // if
502	}
503
504	/* unknown character */
505	. { yyerror( "unknown character" ); }
506
507	%%
508
509	// ----end of lexer----
510
511	void yyerror( const char * errmsg ) {
512	SemanticErrorThrow = true;
513	cerr << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
514	<< ": " << ErrorHelpers::error_str() << errmsg << " before token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
515	}
516
517	// Local Variables: //
518	// mode: c++ //
519	// tab-width: 4 //
520	// compile-command: "make install" //
521	// End: //

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