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lex.ll@ 435e75f

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Last change on this file since 435e75f was a67b60e, checked in by Peter A. Buhr <pabuhr@…>, 8 years ago
rename files and adjust includes
Property mode set to `100644`
File size: 16.2 KB

Rev	Line
[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
[a67b60e]	12	* Last Modified On : Wed Jun 28 21:03:45 2017
	13	* Update Count : 529
[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
[984dce6]	29	#include "ParseNode.h"
	30	#include "TypedefTable.h"
[51b73452]	31
	32	char *yyfilename;
[b87a5ed]	33	std::string *strtext; // accumulate parts of character and string constant value
[51b73452]	34
[de62360d]	35	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
	36	#define RETURN_VAL(x) yylval.tok.str = new std::string( yytext ); RETURN_LOCN( x )
[926af74]	37	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
[de62360d]	38	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
[5f2f2d7]	39
[f487962]	40	#define WHITE_RETURN(x) // do nothing
[de62360d]	41	#define NEWLINE_RETURN() WHITE_RETURN( '\n' )
	42	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
[f487962]	43	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
[de62360d]	44	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
	45	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
[984dce6]	46	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
[de62360d]	47	#define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER )
[51b73452]	48
[3848e0e]	49	void rm_underscore() {
[e7aed49]	50	// Remove underscores in numeric constant by copying the non-underscore characters to the front of the string.
	51	yyleng = 0;
[b87a5ed]	52	for ( int i = 0; yytext[i] != '\0'; i += 1 ) {
	53	if ( yytext[i] != '_' ) {
[e7aed49]	54	yytext[yyleng] = yytext[i];
	55	yyleng += 1;
[b87a5ed]	56	} // if
	57	} // for
	58	yytext[yyleng] = '\0';
[51b73452]	59	}
	60
	61	%}
	62
	63	octal [0-7]
	64	nonzero [1-9]
	65	decimal [0-9]
	66	hex [0-9a-fA-F]
[3848e0e]	67	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
[51b73452]	68
[b87a5ed]	69	// identifier, GCC: $ in identifier
[51b73452]	70	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
	71
[b87a5ed]	72	// attribute identifier, GCC: $ in identifier
[51b73452]	73	attr_identifier "@"{identifier}
	74
[b87a5ed]	75	// numeric constants, CFA: '_' in constant
[3848e0e]	76	hex_quad {hex}("_"?{hex}){3}
[ba2356b]	77	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]	78
	79	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	80	octal_prefix "0""_"?
	81	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix}?
	82
	83	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
	84	decimal_constant {nonzero_digits}{integer_suffix}?
	85
	86	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	87	hex_prefix "0"[xX]"_"?
	88	hex_constant {hex_prefix}{hex_digits}{integer_suffix}?
	89
	90	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
[0213af6]	91	real_decimal {decimal_digits}"."{exponent}?{floating_suffix}?
	92	real_fraction "."{decimal_digits}{exponent}?{floating_suffix}?
	93	real_constant {decimal_digits}{real_fraction}
[51b73452]	94	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[ba2356b]	95	// GCC: D (double) and iI (imaginary) suffixes, and DL (long double)
	96	floating_suffix "_"?([fFdDlL][iI]?\|[iI][lLfFdD]?\|"DL")
[1b29996]	97	floating_constant (({real_constant}{exponent}?)\|({decimal_digits}{exponent})){floating_suffix}?
[51b73452]	98
	99	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
	100	hex_fractional_constant ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
	101	hex_floating_constant {hex_prefix}(({hex_fractional_constant}{binary_exponent})\|({hex_digits}{binary_exponent})){floating_suffix}?
	102
[b87a5ed]	103	// character escape sequence, GCC: \e => esc character
[51b73452]	104	simple_escape "\\"[abefnrtv'"?\\]
[b87a5ed]	105	// ' stop highlighting
[3848e0e]	106	octal_escape "\\"{octal}("_"?{octal}){0,2}
	107	hex_escape "\\""x""_"?{hex_digits}
[51b73452]	108	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	109	cwide_prefix "L"\|"U"\|"u"
	110	swide_prefix {cwide_prefix}\|"u8"
[51b73452]	111
[b87a5ed]	112	// display/white-space characters
[51b73452]	113	h_tab [\011]
	114	form_feed [\014]
	115	v_tab [\013]
	116	c_return [\015]
	117	h_white [ ]\|{h_tab}
	118
[e7aed49]	119	// overloadable operators
[51b73452]	120	op_unary_only "~"\|"!"
	121	op_unary_binary "+"\|"-"\|"*"
	122	op_unary_pre_post "++"\|"--"
	123	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	124
	125	op_binary_only "/"\|"%"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"&="\|"\|="\|"^="\|"<<="\|">>="
	126	op_binary_over {op_unary_binary}\|{op_binary_only}
[e7aed49]	127	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
	128	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
[51b73452]	129
	130	%x COMMENT
[3848e0e]	131	%x BKQUOTE
	132	%x QUOTE
	133	%x STRING
[51b73452]	134
	135	%%
[b87a5ed]	136	/* line directives */
[4040425]	137	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
[8c17ab0]	138	/* " stop highlighting */
[c1c1112]	139	static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b73452]	140	char *end_num;
	141	char begin_string, end_string;
	142	long lineno, length;
	143	lineno = strtol( yytext + 1, &end_num, 0 );
	144	begin_string = strchr( end_num, '"' );
[f487962]	145	if ( begin_string ) { // file name ?
	146	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
	147	assert( end_string ); // closing quote ?
	148	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
	149	assert( length < FILENAME_MAX ); // room for sentinel ?
	150	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
	151	filename[ length ] = '\0'; // terminate string with sentinel
	152	//std::cout << "file " << filename << " line " << lineno << std::endl;
	153	yylineno = lineno;
[c1c1112]	154	yyfilename = filename;
[b87a5ed]	155	} // if
[51b73452]	156	}
	157
[b87a5ed]	158	/* ignore preprocessor directives (for now) */
[51b73452]	159	^{h_white}"#"[^\n]"\n" ;
	160
[cd623a4]	161	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	162	"/*" { BEGIN COMMENT; }
[cd623a4]	163	<COMMENT>.\|\n ;
	164	<COMMENT>"*/" { BEGIN 0; }
[51b73452]	165
[cd623a4]	166	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	167	"//"[^\n]*"\n" ;
[51b73452]	168
[b87a5ed]	169	/* ignore whitespace */
[3848e0e]	170	{h_white}+ { WHITE_RETURN(' '); }
	171	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	172	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b73452]	173
[b87a5ed]	174	/* keywords */
	175	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	176	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	177	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	178	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	179	asm { KEYWORD_RETURN(ASM); }
	180	__asm { KEYWORD_RETURN(ASM); } // GCC
	181	__asm__ { KEYWORD_RETURN(ASM); } // GCC
[02e5ab6]	182	_At { KEYWORD_RETURN(AT); } // CFA
[b87a5ed]	183	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	184	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	185	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	186	auto { KEYWORD_RETURN(AUTO); }
[b87a5ed]	187	_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]	188	break { KEYWORD_RETURN(BREAK); }
	189	case { KEYWORD_RETURN(CASE); }
[b87a5ed]	190	catch { KEYWORD_RETURN(CATCH); } // CFA
[02e5ab6]	191	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
[3848e0e]	192	char { KEYWORD_RETURN(CHAR); }
[b87a5ed]	193	choose { KEYWORD_RETURN(CHOOSE); } // CFA
	194	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
	195	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
	196	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]	197	const { KEYWORD_RETURN(CONST); }
[b87a5ed]	198	__const { KEYWORD_RETURN(CONST); } // GCC
	199	__const__ { KEYWORD_RETURN(CONST); } // GCC
[3848e0e]	200	continue { KEYWORD_RETURN(CONTINUE); }
[e04b636]	201	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
[3848e0e]	202	default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]	203	disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]	204	do { KEYWORD_RETURN(DO); }
[3848e0e]	205	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	206	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	207	else { KEYWORD_RETURN(ELSE); }
[02e5ab6]	208	enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]	209	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	210	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[3848e0e]	211	extern { KEYWORD_RETURN(EXTERN); }
[08061589]	212	fallthrough { KEYWORD_RETURN(FALLTHRU); } // CFA
[b87a5ed]	213	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
	214	finally { KEYWORD_RETURN(FINALLY); } // CFA
[3848e0e]	215	float { KEYWORD_RETURN(FLOAT); }
[b87a5ed]	216	__float128 { KEYWORD_RETURN(FLOAT); } // GCC
	217	for { KEYWORD_RETURN(FOR); }
	218	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	219	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	220	ftype { KEYWORD_RETURN(FTYPE); } // CFA
	221	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	222	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	223	if { KEYWORD_RETURN(IF); }
	224	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	225	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	226	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	227	inline { KEYWORD_RETURN(INLINE); } // C99
	228	__inline { KEYWORD_RETURN(INLINE); } // GCC
	229	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	230	int { KEYWORD_RETURN(INT); }
	231	__int128 { KEYWORD_RETURN(INT); } // GCC
	232	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	233	long { KEYWORD_RETURN(LONG); }
[b87a5ed]	234	lvalue { KEYWORD_RETURN(LVALUE); } // CFA
[6016c87]	235	monitor { KEYWORD_RETURN(MONITOR); } // CFA
[a7c90d4]	236	mutex { KEYWORD_RETURN(MUTEX); } // CFA
[b87a5ed]	237	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]	238	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[3a2128f]	239	one_t { NUMERIC_RETURN(ONE_T); } // CFA
[4040425]	240	otype { KEYWORD_RETURN(OTYPE); } // CFA
[3848e0e]	241	register { KEYWORD_RETURN(REGISTER); }
[b87a5ed]	242	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	243	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	244	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	245	return { KEYWORD_RETURN(RETURN); }
	246	short { KEYWORD_RETURN(SHORT); }
	247	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	248	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	249	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	250	sizeof { KEYWORD_RETURN(SIZEOF); }
	251	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	252	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	253	struct { KEYWORD_RETURN(STRUCT); }
	254	switch { KEYWORD_RETURN(SWITCH); }
[bd4d011]	255	thread { KEYWORD_RETURN(THREAD); } // C11
[b87a5ed]	256	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	257	throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]	258	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[4040425]	259	trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]	260	try { KEYWORD_RETURN(TRY); } // CFA
[8f60f0b]	261	ttype { KEYWORD_RETURN(TTYPE); } // CFA
[3848e0e]	262	typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]	263	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	264	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	265	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[3848e0e]	266	union { KEYWORD_RETURN(UNION); }
	267	unsigned { KEYWORD_RETURN(UNSIGNED); }
[90c3b1c]	268	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
[3848e0e]	269	void { KEYWORD_RETURN(VOID); }
	270	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	271	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	272	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[3848e0e]	273	while { KEYWORD_RETURN(WHILE); }
[3a2128f]	274	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
[51b73452]	275
[b87a5ed]	276	/* identifier */
	277	{identifier} { IDENTIFIER_RETURN(); }
	278	{attr_identifier} { ATTRIBUTE_RETURN(); }
[c6b1105]	279	"`" { BEGIN BKQUOTE; }
[b87a5ed]	280	<BKQUOTE>{identifier} { IDENTIFIER_RETURN(); }
	281	<BKQUOTE>"`" { BEGIN 0; }
[51b73452]	282
[b87a5ed]	283	/* numeric constants */
	284	"0" { NUMERIC_RETURN(ZERO); } // CFA
	285	"1" { NUMERIC_RETURN(ONE); } // CFA
[59db689]	286	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	287	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	288	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[1b29996]	289	{real_decimal} { NUMERIC_RETURN(REALDECIMALconstant); } // must appear before floating_constant
	290	{real_fraction} { NUMERIC_RETURN(REALFRACTIONconstant); } // must appear before floating_constant
[3848e0e]	291	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	292	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b73452]	293
[b87a5ed]	294	/* character constant, allows empty value */
[c1c1112]	295	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new std::string( yytext, yyleng ); }
	296	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
	297	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[b87a5ed]	298	/* ' stop highlighting */
[51b73452]	299
[b87a5ed]	300	/* string constant */
[c1c1112]	301	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new std::string( yytext, yyleng ); }
	302	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
	303	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[b87a5ed]	304	/* " stop highlighting */
[51b73452]	305
[59db689]	306	/* common character/string constant */
[c1c1112]	307	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]	308	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]	309	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]	310
[b87a5ed]	311	/* punctuation */
[615a096]	312	"@" { ASCIIOP_RETURN(); }
[b87a5ed]	313	"[" { ASCIIOP_RETURN(); }
	314	"]" { ASCIIOP_RETURN(); }
	315	"(" { ASCIIOP_RETURN(); }
	316	")" { ASCIIOP_RETURN(); }
	317	"{" { ASCIIOP_RETURN(); }
	318	"}" { ASCIIOP_RETURN(); }
	319	"," { ASCIIOP_RETURN(); } // also operator
	320	":" { ASCIIOP_RETURN(); }
	321	";" { ASCIIOP_RETURN(); }
	322	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	323	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	324
[b87a5ed]	325	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	326	"<:" { RETURN_VAL('['); }
	327	":>" { RETURN_VAL(']'); }
	328	"<%" { RETURN_VAL('{'); }
	329	"%>" { RETURN_VAL('}'); }
[51b73452]	330
[b87a5ed]	331	/* operators */
	332	"!" { ASCIIOP_RETURN(); }
	333	"+" { ASCIIOP_RETURN(); }
	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(); }
[3848e0e]	346
	347	"++" { NAMEDOP_RETURN(ICR); }
	348	"--" { NAMEDOP_RETURN(DECR); }
	349	"==" { NAMEDOP_RETURN(EQ); }
	350	"!=" { NAMEDOP_RETURN(NE); }
	351	"<<" { NAMEDOP_RETURN(LS); }
	352	">>" { NAMEDOP_RETURN(RS); }
	353	"<=" { NAMEDOP_RETURN(LE); }
	354	">=" { NAMEDOP_RETURN(GE); }
	355	"&&" { NAMEDOP_RETURN(ANDAND); }
	356	"\|\|" { NAMEDOP_RETURN(OROR); }
	357	"->" { NAMEDOP_RETURN(ARROW); }
	358	"+=" { NAMEDOP_RETURN(PLUSassign); }
	359	"-=" { NAMEDOP_RETURN(MINUSassign); }
	360	"*=" { NAMEDOP_RETURN(MULTassign); }
	361	"/=" { NAMEDOP_RETURN(DIVassign); }
	362	"%=" { NAMEDOP_RETURN(MODassign); }
	363	"&=" { NAMEDOP_RETURN(ANDassign); }
	364	"\|=" { NAMEDOP_RETURN(ORassign); }
	365	"^=" { NAMEDOP_RETURN(ERassign); }
	366	"<<=" { NAMEDOP_RETURN(LSassign); }
	367	">>=" { NAMEDOP_RETURN(RSassign); }
[51b73452]	368
[08061589]	369	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[097e2b0]	370
[b87a5ed]	371	/* CFA, operator identifier */
	372	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	373	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[02e5ab6]	374	"^?{}" { IDENTIFIER_RETURN(); }
[b87a5ed]	375	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b73452]	376	/*
[daf9671]	377	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
	378	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
	379	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
	380	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
	381	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
	382	identifier to disambiguate this common case.
	383
	384	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
	385	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
	386	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
	387	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
	388	any meaningful program.
	389
	390	The remaining cases are with the increment/decrement operators and conditional expression:
	391
	392	i++? ...(...);
	393	i?++ ...(...);
	394
	395	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
	396	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
	397	space:
	398
	399	i++ ? i : 0;
	400	i? ++i : 0;
[51b73452]	401	*/
[daf9671]	402	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
[b87a5ed]	403	// 1 or 2 character unary operator ?
	404	int i = yytext[1] == '?' ? 1 : 2;
	405	yyless( i ); // put back characters up to first '?'
	406	if ( i > 1 ) {
	407	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	408	} else {
	409	ASCIIOP_RETURN();
	410	} // if
	411	}
	412
	413	/* unknown characters */
[3848e0e]	414	. { printf("unknown character(s):\"%s\" on line %d\n", yytext, yylineno); }
[51b73452]	415
	416	%%
	417
[b87a5ed]	418	// Local Variables: //
	419	// mode: c++ //
[de62360d]	420	// tab-width: 4 //
[b87a5ed]	421	// compile-command: "make install" //
	422	// End: //

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