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lex.ll @ b93c544

Last change on this file since b93c544 was 647e2ea, checked in by Peter A. Buhr <pabuhr@…>, 3 months ago
try @@(...) for attributes, rename and reorder grammar rules, remove apparently unnecessary push/pop rules, first attempt at [] => [void] return type
Property mode set to `100644`
File size: 21.0 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 : Sat Feb 24 11:47:24 2024
13	* Update Count : 777
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); } // CFA
220	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
221	alignof { KEYWORD_RETURN(ALIGNOF); } // CFA
222	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
223	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
224	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
225	and { QKEYWORD_RETURN(WAND); } // CFA
226	asm { KEYWORD_RETURN(ASM); }
227	__asm { KEYWORD_RETURN(ASM); } // GCC
228	__asm__ { KEYWORD_RETURN(ASM); } // GCC
229	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
230	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
231	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
232	auto { KEYWORD_RETURN(AUTO); }
233	__auto_type { KEYWORD_RETURN(AUTO_TYPE); }
234	basetypeof { KEYWORD_RETURN(BASETYPEOF); } // CFA
235	_Bool { KEYWORD_RETURN(BOOL); } // C99
236	break { KEYWORD_RETURN(BREAK); }
237	case { KEYWORD_RETURN(CASE); }
238	catch { QKEYWORD_RETURN(CATCH); } // CFA
239	catchResume { QKEYWORD_RETURN(CATCHRESUME); } // CFA
240	char { KEYWORD_RETURN(CHAR); }
241	choose { KEYWORD_RETURN(CHOOSE); } // CFA
242	coerce { KEYWORD_RETURN(COERCE); } // CFA
243	corun { KEYWORD_RETURN(CORUN); } // CFA
244	cofor { KEYWORD_RETURN(COFOR); } // CFA
245	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
246	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
247	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
248	const { KEYWORD_RETURN(CONST); }
249	__const { KEYWORD_RETURN(CONST); } // GCC
250	__const__ { KEYWORD_RETURN(CONST); } // GCC
251	continue { KEYWORD_RETURN(CONTINUE); }
252	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
253	_Decimal32 { KEYWORD_RETURN(DECIMAL32); } // GCC
254	_Decimal64 { KEYWORD_RETURN(DECIMAL64); } // GCC
255	_Decimal128 { KEYWORD_RETURN(DECIMAL128); } // GCC
256	default { KEYWORD_RETURN(DEFAULT); }
257	disable { KEYWORD_RETURN(DISABLE); } // CFA
258	do { KEYWORD_RETURN(DO); }
259	double { KEYWORD_RETURN(DOUBLE); }
260	dtype { KEYWORD_RETURN(DTYPE); } // CFA
261	else { KEYWORD_RETURN(ELSE); }
262	enable { KEYWORD_RETURN(ENABLE); } // CFA
263	enum { KEYWORD_RETURN(ENUM); }
264	exception { KEYWORD_RETURN(EXCEPTION); } // CFA
265	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
266	extern { KEYWORD_RETURN(EXTERN); }
267	fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
268	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
269	finally { QKEYWORD_RETURN(FINALLY); } // CFA
270	fixup { QKEYWORD_RETURN(FIXUP); } // CFA
271	float { KEYWORD_RETURN(FLOAT); }
272	__float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
273	float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
274	__float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
275	float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
276	_Float16 { FLOATXX(uFLOAT16); } // GCC
277	_Float32 { FLOATXX(uFLOAT32); } // GCC
278	_Float32x { FLOATXX(uFLOAT32X); } // GCC
279	_Float64 { FLOATXX(uFLOAT64); } // GCC
280	_Float64x { FLOATXX(uFLOAT64X); } // GCC
281	_Float128 { FLOATXX(uFLOAT128); } // GCC
282	_Float128x { FLOATXX(uFLOAT128); } // GCC
283	for { KEYWORD_RETURN(FOR); }
284	forall { KEYWORD_RETURN(FORALL); } // CFA
285	fortran { KEYWORD_RETURN(FORTRAN); }
286	ftype { KEYWORD_RETURN(FTYPE); } // CFA
287	generator { KEYWORD_RETURN(GENERATOR); } // CFA
288	_Generic { KEYWORD_RETURN(GENERIC); } // C11
289	goto { KEYWORD_RETURN(GOTO); }
290	if { KEYWORD_RETURN(IF); }
291	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
292	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
293	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
294	inline { KEYWORD_RETURN(INLINE); } // C99
295	__inline { KEYWORD_RETURN(INLINE); } // GCC
296	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
297	int { KEYWORD_RETURN(INT); }
298	int128 { KEYWORD_RETURN(INT128); } // CFA
299	__int128 { KEYWORD_RETURN(INT128); } // GCC
300	__int128_t { KEYWORD_RETURN(INT128); } // GCC
301	__label__ { KEYWORD_RETURN(LABEL); } // GCC
302	long { KEYWORD_RETURN(LONG); }
303	monitor { KEYWORD_RETURN(MONITOR); } // CFA
304	mutex { KEYWORD_RETURN(MUTEX); } // CFA
305	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
306	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
307	one_t { NUMERIC_RETURN(ONE_T); } // CFA
308	or { QKEYWORD_RETURN(WOR); } // CFA
309	otype { KEYWORD_RETURN(OTYPE); } // CFA
310	recover { QKEYWORD_RETURN(RECOVER); } // CFA
311	register { KEYWORD_RETURN(REGISTER); }
312	report { KEYWORD_RETURN(THROWRESUME); } // CFA
313	restrict { KEYWORD_RETURN(RESTRICT); } // C99
314	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
315	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
316	return { KEYWORD_RETURN(RETURN); }
317	/* resume { KEYWORD_RETURN(RESUME); } // CFA */
318	short { KEYWORD_RETURN(SHORT); }
319	signed { KEYWORD_RETURN(SIGNED); }
320	__signed { KEYWORD_RETURN(SIGNED); } // GCC
321	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
322	sizeof { KEYWORD_RETURN(SIZEOF); }
323	static { KEYWORD_RETURN(STATIC); }
324	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
325	static_assert { KEYWORD_RETURN(STATICASSERT); } // C23
326	struct { KEYWORD_RETURN(STRUCT); }
327	suspend { KEYWORD_RETURN(SUSPEND); } // CFA
328	switch { KEYWORD_RETURN(SWITCH); }
329	thread { KEYWORD_RETURN(THREAD); } // C11
330	__thread { KEYWORD_RETURN(THREADLOCALGCC); } // GCC
331	_Thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C11
332	thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C23
333	throw { KEYWORD_RETURN(THROW); } // CFA
334	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
335	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
336	trait { KEYWORD_RETURN(TRAIT); } // CFA
337	try { KEYWORD_RETURN(TRY); } // CFA
338	ttype { KEYWORD_RETURN(TTYPE); } // CFA
339	typedef { KEYWORD_RETURN(TYPEDEF); }
340	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
341	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
342	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
343	typeid { KEYWORD_RETURN(TYPEID); } // GCC
344	union { KEYWORD_RETURN(UNION); }
345	__uint128_t { KEYWORD_RETURN(UINT128); } // GCC
346	unsigned { KEYWORD_RETURN(UNSIGNED); }
347	__builtin_va_arg { KEYWORD_RETURN(VA_ARG); } // GCC
348	__builtin_va_list { KEYWORD_RETURN(VA_LIST); } // GCC
349	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
350	void { KEYWORD_RETURN(VOID); }
351	volatile { KEYWORD_RETURN(VOLATILE); }
352	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
353	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
354	vtable { KEYWORD_RETURN(VTABLE); } // CFA
355	waitfor { KEYWORD_RETURN(WAITFOR); } // CFA
356	waituntil { KEYWORD_RETURN(WAITUNTIL); } // CFA
357	when { KEYWORD_RETURN(WHEN); } // CFA
358	while { KEYWORD_RETURN(WHILE); }
359	with { KEYWORD_RETURN(WITH); } // CFA
360	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
361
362	/* identifier */
363	{identifier} { IDENTIFIER_RETURN(); }
364	"``"{identifier} { // CFA
365	yytext[yyleng] = '\0'; yytext += 2; // SKULLDUGGERY: remove backquotes (ok to shorten?)
366	IDENTIFIER_RETURN();
367	}
368
369	/* numeric constants */
370	{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
371	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
372	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
373	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
374	{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
375	{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
376	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
377	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
378
379	/* character constant, allows empty value */
380	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
381	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
382	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
383	/* ' stop editor highlighting */
384
385	/* string constant */
386	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
387	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
388	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
389	/* " stop editor highlighting */
390
391	/* common character/string constant */
392	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
393	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
394	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
395
396	/* punctuation */
397	"@" { ASCIIOP_RETURN(); }
398	"`" { ASCIIOP_RETURN(); }
399	"[" { ASCIIOP_RETURN(); }
400	"]" { ASCIIOP_RETURN(); }
401	"(" { ASCIIOP_RETURN(); }
402	")" { ASCIIOP_RETURN(); }
403	"{" { ASCIIOP_RETURN(); }
404	"}" { ASCIIOP_RETURN(); }
405	"," { ASCIIOP_RETURN(); } // also operator
406	":" { ASCIIOP_RETURN(); }
407	";" { ASCIIOP_RETURN(); }
408	"." { ASCIIOP_RETURN(); } // also operator
409	"@@" { NAMEDOP_RETURN(ATTR); } // CFA, attribute shorthand
410	"..." { NAMEDOP_RETURN(ELLIPSIS); }
411
412	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
413	"<:" { RETURN_VAL('['); }
414	":>" { RETURN_VAL(']'); }
415	"<%" { RETURN_VAL('{'); }
416	"%>" { RETURN_VAL('}'); }
417
418	/* operators */
419	"!" { ASCIIOP_RETURN(); }
420	"+" { ASCIIOP_RETURN(); }
421	"-" { ASCIIOP_RETURN(); }
422	"*" { ASCIIOP_RETURN(); }
423	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
424	"/" { ASCIIOP_RETURN(); }
425	"%" { ASCIIOP_RETURN(); }
426	"^" { ASCIIOP_RETURN(); }
427	"~" { ASCIIOP_RETURN(); }
428	"&" { ASCIIOP_RETURN(); }
429	"\|" { ASCIIOP_RETURN(); }
430	"<" { ASCIIOP_RETURN(); }
431	">" { ASCIIOP_RETURN(); }
432	"=" { ASCIIOP_RETURN(); }
433	"?" { ASCIIOP_RETURN(); }
434
435	"++" { NAMEDOP_RETURN(ICR); }
436	"--" { NAMEDOP_RETURN(DECR); }
437	"==" { NAMEDOP_RETURN(EQ); }
438	"!=" { NAMEDOP_RETURN(NE); }
439	"<<" { NAMEDOP_RETURN(LS); }
440	">>" { NAMEDOP_RETURN(RS); }
441	"<=" { NAMEDOP_RETURN(LE); }
442	">=" { NAMEDOP_RETURN(GE); }
443	"&&" { NAMEDOP_RETURN(ANDAND); }
444	"\|\|" { NAMEDOP_RETURN(OROR); }
445	"->" { NAMEDOP_RETURN(ARROW); }
446	"+=" { NAMEDOP_RETURN(PLUSassign); }
447	"-=" { NAMEDOP_RETURN(MINUSassign); }
448	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
449	"*=" { NAMEDOP_RETURN(MULTassign); }
450	"/=" { NAMEDOP_RETURN(DIVassign); }
451	"%=" { NAMEDOP_RETURN(MODassign); }
452	"&=" { NAMEDOP_RETURN(ANDassign); }
453	"\|=" { NAMEDOP_RETURN(ORassign); }
454	"^=" { NAMEDOP_RETURN(ERassign); }
455	"<<=" { NAMEDOP_RETURN(LSassign); }
456	">>=" { NAMEDOP_RETURN(RSassign); }
457
458	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
459	"~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
460	"-~" { NAMEDOP_RETURN(ErangeDown); } // CFA
461	"-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA
462
463	/* CFA, operator identifier */
464	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
465	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
466	"^?{}" { IDENTIFIER_RETURN(); }
467	"?`"{identifier} { // postfix operator
468	yylval.tok.str = new string( &yytext[2] ); // remove ?`
469	yylval.tok.str = build_postfix_name( yylval.tok.str ); // add prefix
470	RETURN_LOCN( typedefTable.isKind( *yylval.tok.str ) );
471	}
472	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
473	/*
474	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
475	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
476	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
477	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
478	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
479	identifier to disambiguate this common case.
480
481	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
482	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
483	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
484	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
485	any meaningful program.
486
487	The remaining cases are with the increment/decrement operators and conditional expression:
488
489	i++? ...(...);
490	i?++ ...(...);
491
492	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
493	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
494	space:
495
496	i++ ? i : 0;
497	i? ++i : 0;
498	*/
499	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
500	// 1 or 2 character unary operator ?
501	int i = yytext[1] == '?' ? 1 : 2;
502	yyless( i ); // put back characters up to first '?'
503	if ( i > 1 ) {
504	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
505	} else {
506	ASCIIOP_RETURN();
507	} // if
508	}
509
510	/* unknown character */
511	. { yyerror( "unknown character" ); }
512
513	%%
514
515	// ----end of lexer----
516
517	void yyerror( const char * errmsg ) {
518	SemanticErrorThrow = true;
519	cerr << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
520	<< ": " << ErrorHelpers::error_str() << errmsg << " before token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
521	}
522
523	// Local Variables: //
524	// mode: c++ //
525	// tab-width: 4 //
526	// compile-command: "make install" //
527	// End: //

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