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lex.ll@ 6cff9f3

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Last change on this file since 6cff9f3 was 6016c87, checked in by Peter A. Buhr <pabuhr@…>, 8 years ago
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[b87a5ed]	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.
[8f60f0b]	6	*
[6016c87]	7	* lex.ll --
[8f60f0b]	8	*
[51b73452]	9	* Author : Peter A. Buhr
	10	* Created On : Sat Sep 22 08:58:10 2001
[926af74]	11	* Last Modified By : Peter A. Buhr
[6016c87]	12	* Last Modified On : Tue May 30 22:00:48 2017
	13	* Update Count : 527
[51b73452]	14	*/
	15
	16	%option yylineno
[5f2f2d7]	17	%option nounput
[51b73452]	18
	19	%{
[de62360d]	20	// This lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive have been
	21	// performed and removed from the source. The only exceptions are preprocessor directives passed to the compiler (e.g.,
	22	// line-number directives) and C/C++ style comments, which are ignored.
[51b73452]	23
[8c17ab0]	24	//************************** Includes and Defines **************************
[51b73452]	25
	26	#include <string>
[f487962]	27	#include <cstdio> // FILENAME_MAX
[51b73452]	28
	29	#include "lex.h"
[59db689]	30	#include "parser.h" // YACC generated definitions based on C++ grammar
[984dce6]	31	#include "ParseNode.h"
	32	#include "TypedefTable.h"
[51b73452]	33
	34	char *yyfilename;
[b87a5ed]	35	std::string *strtext; // accumulate parts of character and string constant value
[51b73452]	36
[de62360d]	37	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
	38	#define RETURN_VAL(x) yylval.tok.str = new std::string( yytext ); RETURN_LOCN( x )
[926af74]	39	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
[de62360d]	40	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
[5f2f2d7]	41
[f487962]	42	#define WHITE_RETURN(x) // do nothing
[de62360d]	43	#define NEWLINE_RETURN() WHITE_RETURN( '\n' )
	44	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
[f487962]	45	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
[de62360d]	46	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
	47	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
[984dce6]	48	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
[de62360d]	49	#define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER )
[51b73452]	50
[3848e0e]	51	void rm_underscore() {
[e7aed49]	52	// Remove underscores in numeric constant by copying the non-underscore characters to the front of the string.
	53	yyleng = 0;
[b87a5ed]	54	for ( int i = 0; yytext[i] != '\0'; i += 1 ) {
	55	if ( yytext[i] != '_' ) {
[e7aed49]	56	yytext[yyleng] = yytext[i];
	57	yyleng += 1;
[b87a5ed]	58	} // if
	59	} // for
	60	yytext[yyleng] = '\0';
[51b73452]	61	}
	62
	63	%}
	64
	65	octal [0-7]
	66	nonzero [1-9]
	67	decimal [0-9]
	68	hex [0-9a-fA-F]
[3848e0e]	69	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
[51b73452]	70
[b87a5ed]	71	// identifier, GCC: $ in identifier
[51b73452]	72	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
	73
[b87a5ed]	74	// attribute identifier, GCC: $ in identifier
[51b73452]	75	attr_identifier "@"{identifier}
	76
[b87a5ed]	77	// numeric constants, CFA: '_' in constant
[3848e0e]	78	hex_quad {hex}("_"?{hex}){3}
[ba2356b]	79	integer_suffix "_"?(([uU](("ll"\|"LL"\|[lL])[iI]\|[iI]?("ll"\|"LL"\|[lL])?))\|([iI](("ll"\|"LL"\|[lL])[uU]\|[uU]?("ll"\|"LL"\|[lL])?))\|(("ll"\|"LL"\|[lL])([iI][uU]\|[uU]?[iI]?)))
[51b73452]	80
	81	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	82	octal_prefix "0""_"?
	83	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix}?
	84
	85	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
	86	decimal_constant {nonzero_digits}{integer_suffix}?
	87
	88	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	89	hex_prefix "0"[xX]"_"?
	90	hex_constant {hex_prefix}{hex_digits}{integer_suffix}?
	91
	92	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
[0213af6]	93	real_decimal {decimal_digits}"."{exponent}?{floating_suffix}?
	94	real_fraction "."{decimal_digits}{exponent}?{floating_suffix}?
	95	real_constant {decimal_digits}{real_fraction}
[51b73452]	96	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[ba2356b]	97	// GCC: D (double) and iI (imaginary) suffixes, and DL (long double)
	98	floating_suffix "_"?([fFdDlL][iI]?\|[iI][lLfFdD]?\|"DL")
[1b29996]	99	floating_constant (({real_constant}{exponent}?)\|({decimal_digits}{exponent})){floating_suffix}?
[51b73452]	100
	101	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
	102	hex_fractional_constant ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
	103	hex_floating_constant {hex_prefix}(({hex_fractional_constant}{binary_exponent})\|({hex_digits}{binary_exponent})){floating_suffix}?
	104
[b87a5ed]	105	// character escape sequence, GCC: \e => esc character
[51b73452]	106	simple_escape "\\"[abefnrtv'"?\\]
[b87a5ed]	107	// ' stop highlighting
[3848e0e]	108	octal_escape "\\"{octal}("_"?{octal}){0,2}
	109	hex_escape "\\""x""_"?{hex_digits}
[51b73452]	110	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	111	cwide_prefix "L"\|"U"\|"u"
	112	swide_prefix {cwide_prefix}\|"u8"
[51b73452]	113
[b87a5ed]	114	// display/white-space characters
[51b73452]	115	h_tab [\011]
	116	form_feed [\014]
	117	v_tab [\013]
	118	c_return [\015]
	119	h_white [ ]\|{h_tab}
	120
[e7aed49]	121	// overloadable operators
[51b73452]	122	op_unary_only "~"\|"!"
	123	op_unary_binary "+"\|"-"\|"*"
	124	op_unary_pre_post "++"\|"--"
	125	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	126
	127	op_binary_only "/"\|"%"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"&="\|"\|="\|"^="\|"<<="\|">>="
	128	op_binary_over {op_unary_binary}\|{op_binary_only}
[e7aed49]	129	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
	130	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
[51b73452]	131
	132	%x COMMENT
[3848e0e]	133	%x BKQUOTE
	134	%x QUOTE
	135	%x STRING
[51b73452]	136
	137	%%
[b87a5ed]	138	/* line directives */
[4040425]	139	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
[8c17ab0]	140	/* " stop highlighting */
[c1c1112]	141	static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b73452]	142	char *end_num;
	143	char begin_string, end_string;
	144	long lineno, length;
	145	lineno = strtol( yytext + 1, &end_num, 0 );
	146	begin_string = strchr( end_num, '"' );
[f487962]	147	if ( begin_string ) { // file name ?
	148	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
	149	assert( end_string ); // closing quote ?
	150	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
	151	assert( length < FILENAME_MAX ); // room for sentinel ?
	152	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
	153	filename[ length ] = '\0'; // terminate string with sentinel
	154	//std::cout << "file " << filename << " line " << lineno << std::endl;
	155	yylineno = lineno;
[c1c1112]	156	yyfilename = filename;
[b87a5ed]	157	} // if
[51b73452]	158	}
	159
[b87a5ed]	160	/* ignore preprocessor directives (for now) */
[51b73452]	161	^{h_white}"#"[^\n]"\n" ;
	162
[cd623a4]	163	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	164	"/*" { BEGIN COMMENT; }
[cd623a4]	165	<COMMENT>.\|\n ;
	166	<COMMENT>"*/" { BEGIN 0; }
[51b73452]	167
[cd623a4]	168	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	169	"//"[^\n]*"\n" ;
[51b73452]	170
[b87a5ed]	171	/* ignore whitespace */
[3848e0e]	172	{h_white}+ { WHITE_RETURN(' '); }
	173	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	174	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b73452]	175
[b87a5ed]	176	/* keywords */
	177	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	178	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	179	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	180	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	181	asm { KEYWORD_RETURN(ASM); }
	182	__asm { KEYWORD_RETURN(ASM); } // GCC
	183	__asm__ { KEYWORD_RETURN(ASM); } // GCC
[02e5ab6]	184	_At { KEYWORD_RETURN(AT); } // CFA
[b87a5ed]	185	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	186	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	187	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	188	auto { KEYWORD_RETURN(AUTO); }
[b87a5ed]	189	_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]	190	break { KEYWORD_RETURN(BREAK); }
	191	case { KEYWORD_RETURN(CASE); }
[b87a5ed]	192	catch { KEYWORD_RETURN(CATCH); } // CFA
[02e5ab6]	193	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
[3848e0e]	194	char { KEYWORD_RETURN(CHAR); }
[b87a5ed]	195	choose { KEYWORD_RETURN(CHOOSE); } // CFA
	196	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
	197	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
	198	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]	199	const { KEYWORD_RETURN(CONST); }
[b87a5ed]	200	__const { KEYWORD_RETURN(CONST); } // GCC
	201	__const__ { KEYWORD_RETURN(CONST); } // GCC
[3848e0e]	202	continue { KEYWORD_RETURN(CONTINUE); }
[e04b636]	203	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
[3848e0e]	204	default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]	205	disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]	206	do { KEYWORD_RETURN(DO); }
[3848e0e]	207	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	208	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	209	else { KEYWORD_RETURN(ELSE); }
[02e5ab6]	210	enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]	211	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	212	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[3848e0e]	213	extern { KEYWORD_RETURN(EXTERN); }
[08061589]	214	fallthrough { KEYWORD_RETURN(FALLTHRU); } // CFA
[b87a5ed]	215	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
	216	finally { KEYWORD_RETURN(FINALLY); } // CFA
[3848e0e]	217	float { KEYWORD_RETURN(FLOAT); }
[b87a5ed]	218	__float128 { KEYWORD_RETURN(FLOAT); } // GCC
	219	for { KEYWORD_RETURN(FOR); }
	220	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	221	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	222	ftype { KEYWORD_RETURN(FTYPE); } // CFA
	223	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	224	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	225	if { KEYWORD_RETURN(IF); }
	226	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	227	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	228	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	229	inline { KEYWORD_RETURN(INLINE); } // C99
	230	__inline { KEYWORD_RETURN(INLINE); } // GCC
	231	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	232	int { KEYWORD_RETURN(INT); }
	233	__int128 { KEYWORD_RETURN(INT); } // GCC
	234	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	235	long { KEYWORD_RETURN(LONG); }
[b87a5ed]	236	lvalue { KEYWORD_RETURN(LVALUE); } // CFA
[6016c87]	237	monitor { KEYWORD_RETURN(MONITOR); } // CFA
[a7c90d4]	238	mutex { KEYWORD_RETURN(MUTEX); } // CFA
[b87a5ed]	239	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]	240	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[3a2128f]	241	one_t { NUMERIC_RETURN(ONE_T); } // CFA
[4040425]	242	otype { KEYWORD_RETURN(OTYPE); } // CFA
[3848e0e]	243	register { KEYWORD_RETURN(REGISTER); }
[b87a5ed]	244	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	245	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	246	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	247	return { KEYWORD_RETURN(RETURN); }
	248	short { KEYWORD_RETURN(SHORT); }
	249	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	250	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	251	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	252	sizeof { KEYWORD_RETURN(SIZEOF); }
	253	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	254	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	255	struct { KEYWORD_RETURN(STRUCT); }
	256	switch { KEYWORD_RETURN(SWITCH); }
[bd4d011]	257	thread { KEYWORD_RETURN(THREAD); } // C11
[b87a5ed]	258	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	259	throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]	260	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[4040425]	261	trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]	262	try { KEYWORD_RETURN(TRY); } // CFA
[8f60f0b]	263	ttype { KEYWORD_RETURN(TTYPE); } // CFA
[3848e0e]	264	typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]	265	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	266	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	267	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[3848e0e]	268	union { KEYWORD_RETURN(UNION); }
	269	unsigned { KEYWORD_RETURN(UNSIGNED); }
[90c3b1c]	270	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
[3848e0e]	271	void { KEYWORD_RETURN(VOID); }
	272	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	273	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	274	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[3848e0e]	275	while { KEYWORD_RETURN(WHILE); }
[3a2128f]	276	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
[51b73452]	277
[b87a5ed]	278	/* identifier */
	279	{identifier} { IDENTIFIER_RETURN(); }
	280	{attr_identifier} { ATTRIBUTE_RETURN(); }
[c6b1105]	281	"`" { BEGIN BKQUOTE; }
[b87a5ed]	282	<BKQUOTE>{identifier} { IDENTIFIER_RETURN(); }
	283	<BKQUOTE>"`" { BEGIN 0; }
[51b73452]	284
[b87a5ed]	285	/* numeric constants */
	286	"0" { NUMERIC_RETURN(ZERO); } // CFA
	287	"1" { NUMERIC_RETURN(ONE); } // CFA
[59db689]	288	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	289	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	290	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[1b29996]	291	{real_decimal} { NUMERIC_RETURN(REALDECIMALconstant); } // must appear before floating_constant
	292	{real_fraction} { NUMERIC_RETURN(REALFRACTIONconstant); } // must appear before floating_constant
[3848e0e]	293	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	294	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b73452]	295
[b87a5ed]	296	/* character constant, allows empty value */
[c1c1112]	297	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new std::string( yytext, yyleng ); }
	298	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
	299	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[b87a5ed]	300	/* ' stop highlighting */
[51b73452]	301
[b87a5ed]	302	/* string constant */
[c1c1112]	303	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new std::string( yytext, yyleng ); }
	304	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
	305	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[b87a5ed]	306	/* " stop highlighting */
[51b73452]	307
[59db689]	308	/* common character/string constant */
[c1c1112]	309	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]	310	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]	311	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]	312
[b87a5ed]	313	/* punctuation */
[615a096]	314	"@" { ASCIIOP_RETURN(); }
[b87a5ed]	315	"[" { ASCIIOP_RETURN(); }
	316	"]" { ASCIIOP_RETURN(); }
	317	"(" { ASCIIOP_RETURN(); }
	318	")" { ASCIIOP_RETURN(); }
	319	"{" { ASCIIOP_RETURN(); }
	320	"}" { ASCIIOP_RETURN(); }
	321	"," { ASCIIOP_RETURN(); } // also operator
	322	":" { ASCIIOP_RETURN(); }
	323	";" { ASCIIOP_RETURN(); }
	324	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	325	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	326
[b87a5ed]	327	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	328	"<:" { RETURN_VAL('['); }
	329	":>" { RETURN_VAL(']'); }
	330	"<%" { RETURN_VAL('{'); }
	331	"%>" { RETURN_VAL('}'); }
[51b73452]	332
[b87a5ed]	333	/* operators */
	334	"!" { ASCIIOP_RETURN(); }
	335	"+" { ASCIIOP_RETURN(); }
	336	"-" { ASCIIOP_RETURN(); }
	337	"*" { ASCIIOP_RETURN(); }
	338	"/" { ASCIIOP_RETURN(); }
	339	"%" { ASCIIOP_RETURN(); }
	340	"^" { ASCIIOP_RETURN(); }
	341	"~" { ASCIIOP_RETURN(); }
	342	"&" { ASCIIOP_RETURN(); }
	343	"\|" { ASCIIOP_RETURN(); }
	344	"<" { ASCIIOP_RETURN(); }
	345	">" { ASCIIOP_RETURN(); }
	346	"=" { ASCIIOP_RETURN(); }
	347	"?" { ASCIIOP_RETURN(); }
[3848e0e]	348
	349	"++" { NAMEDOP_RETURN(ICR); }
	350	"--" { NAMEDOP_RETURN(DECR); }
	351	"==" { NAMEDOP_RETURN(EQ); }
	352	"!=" { NAMEDOP_RETURN(NE); }
	353	"<<" { NAMEDOP_RETURN(LS); }
	354	">>" { NAMEDOP_RETURN(RS); }
	355	"<=" { NAMEDOP_RETURN(LE); }
	356	">=" { NAMEDOP_RETURN(GE); }
	357	"&&" { NAMEDOP_RETURN(ANDAND); }
	358	"\|\|" { NAMEDOP_RETURN(OROR); }
	359	"->" { NAMEDOP_RETURN(ARROW); }
	360	"+=" { NAMEDOP_RETURN(PLUSassign); }
	361	"-=" { NAMEDOP_RETURN(MINUSassign); }
	362	"*=" { NAMEDOP_RETURN(MULTassign); }
	363	"/=" { NAMEDOP_RETURN(DIVassign); }
	364	"%=" { NAMEDOP_RETURN(MODassign); }
	365	"&=" { NAMEDOP_RETURN(ANDassign); }
	366	"\|=" { NAMEDOP_RETURN(ORassign); }
	367	"^=" { NAMEDOP_RETURN(ERassign); }
	368	"<<=" { NAMEDOP_RETURN(LSassign); }
	369	">>=" { NAMEDOP_RETURN(RSassign); }
[51b73452]	370
[08061589]	371	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[097e2b0]	372
[b87a5ed]	373	/* CFA, operator identifier */
	374	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	375	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[02e5ab6]	376	"^?{}" { IDENTIFIER_RETURN(); }
[b87a5ed]	377	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b73452]	378	/*
[daf9671]	379	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
	380	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
	381	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
	382	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
	383	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
	384	identifier to disambiguate this common case.
	385
	386	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
	387	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
	388	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
	389	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
	390	any meaningful program.
	391
	392	The remaining cases are with the increment/decrement operators and conditional expression:
	393
	394	i++? ...(...);
	395	i?++ ...(...);
	396
	397	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
	398	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
	399	space:
	400
	401	i++ ? i : 0;
	402	i? ++i : 0;
[51b73452]	403	*/
[daf9671]	404	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
[b87a5ed]	405	// 1 or 2 character unary operator ?
	406	int i = yytext[1] == '?' ? 1 : 2;
	407	yyless( i ); // put back characters up to first '?'
	408	if ( i > 1 ) {
	409	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	410	} else {
	411	ASCIIOP_RETURN();
	412	} // if
	413	}
	414
	415	/* unknown characters */
[3848e0e]	416	. { printf("unknown character(s):\"%s\" on line %d\n", yytext, yylineno); }
[51b73452]	417
	418	%%
	419
[b87a5ed]	420	// Local Variables: //
	421	// mode: c++ //
[de62360d]	422	// tab-width: 4 //
[b87a5ed]	423	// compile-command: "make install" //
	424	// End: //

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