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Last change on this file since c3acf0aa was 4e9c7c1, checked in by Thierry Delisle <tdelisle@…>, 8 years ago
Update lex.ll to no longer require libflex.so, since it has name mangling issues on certain machines (e.g. my laptop)
Property mode set to `100644`
File size: 16.5 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
[a2e0687]	12	* Last Modified On : Thu Jul 27 21:46:06 2017
	13	* Update Count : 550
[51b73452]	14	*/
	15
	16	%option yylineno
[4e9c7c1]	17	%option noyywrap
[5f2f2d7]	18	%option nounput
[51b73452]	19
	20	%{
[de62360d]	21	// This 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.
[51b73452]	24
[8c17ab0]	25	//************************** Includes and Defines **************************
[51b73452]	26
	27	#include <string>
[f487962]	28	#include <cstdio> // FILENAME_MAX
[51b73452]	29
[984dce6]	30	#include "ParseNode.h"
	31	#include "TypedefTable.h"
[51b73452]	32
	33	char *yyfilename;
[b87a5ed]	34	std::string *strtext; // accumulate parts of character and string constant value
[51b73452]	35
[de62360d]	36	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
	37	#define RETURN_VAL(x) yylval.tok.str = new std::string( yytext ); RETURN_LOCN( x )
[926af74]	38	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
[de62360d]	39	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
[5f2f2d7]	40
[f487962]	41	#define WHITE_RETURN(x) // do nothing
[de62360d]	42	#define NEWLINE_RETURN() WHITE_RETURN( '\n' )
	43	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
[f487962]	44	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
[de62360d]	45	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
	46	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
[984dce6]	47	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
[de62360d]	48	#define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER )
[51b73452]	49
[3848e0e]	50	void rm_underscore() {
[e7aed49]	51	// Remove underscores in numeric constant by copying the non-underscore characters to the front of the string.
	52	yyleng = 0;
[b87a5ed]	53	for ( int i = 0; yytext[i] != '\0'; i += 1 ) {
	54	if ( yytext[i] != '_' ) {
[e7aed49]	55	yytext[yyleng] = yytext[i];
	56	yyleng += 1;
[b87a5ed]	57	} // if
	58	} // for
	59	yytext[yyleng] = '\0';
[51b73452]	60	}
	61
[7812f1d1]	62	// Stop warning due to incorrectly generated flex code.
	63	#pragma GCC diagnostic ignored "-Wsign-compare"
[51b73452]	64	%}
	65
	66	octal [0-7]
	67	nonzero [1-9]
	68	decimal [0-9]
	69	hex [0-9a-fA-F]
[3848e0e]	70	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
[51b73452]	71
[b87a5ed]	72	// identifier, GCC: $ in identifier
[51b73452]	73	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
	74
[b87a5ed]	75	// attribute identifier, GCC: $ in identifier
[51b73452]	76	attr_identifier "@"{identifier}
	77
[b87a5ed]	78	// numeric constants, CFA: '_' in constant
[3848e0e]	79	hex_quad {hex}("_"?{hex}){3}
[ba2356b]	80	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]	81
	82	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	83	octal_prefix "0""_"?
	84	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix}?
	85
	86	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
	87	decimal_constant {nonzero_digits}{integer_suffix}?
	88
	89	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	90	hex_prefix "0"[xX]"_"?
	91	hex_constant {hex_prefix}{hex_digits}{integer_suffix}?
	92
	93	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
[0213af6]	94	real_decimal {decimal_digits}"."{exponent}?{floating_suffix}?
	95	real_fraction "."{decimal_digits}{exponent}?{floating_suffix}?
	96	real_constant {decimal_digits}{real_fraction}
[51b73452]	97	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[ba2356b]	98	// GCC: D (double) and iI (imaginary) suffixes, and DL (long double)
	99	floating_suffix "_"?([fFdDlL][iI]?\|[iI][lLfFdD]?\|"DL")
[1b29996]	100	floating_constant (({real_constant}{exponent}?)\|({decimal_digits}{exponent})){floating_suffix}?
[51b73452]	101
	102	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
	103	hex_fractional_constant ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
	104	hex_floating_constant {hex_prefix}(({hex_fractional_constant}{binary_exponent})\|({hex_digits}{binary_exponent})){floating_suffix}?
	105
[b87a5ed]	106	// character escape sequence, GCC: \e => esc character
[51b73452]	107	simple_escape "\\"[abefnrtv'"?\\]
[b87a5ed]	108	// ' stop highlighting
[3848e0e]	109	octal_escape "\\"{octal}("_"?{octal}){0,2}
	110	hex_escape "\\""x""_"?{hex_digits}
[51b73452]	111	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	112	cwide_prefix "L"\|"U"\|"u"
	113	swide_prefix {cwide_prefix}\|"u8"
[51b73452]	114
[b87a5ed]	115	// display/white-space characters
[51b73452]	116	h_tab [\011]
	117	form_feed [\014]
	118	v_tab [\013]
	119	c_return [\015]
	120	h_white [ ]\|{h_tab}
	121
[e7aed49]	122	// overloadable operators
[51b73452]	123	op_unary_only "~"\|"!"
	124	op_unary_binary "+"\|"-"\|"*"
	125	op_unary_pre_post "++"\|"--"
	126	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	127
[994d080]	128	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
[51b73452]	129	op_binary_over {op_unary_binary}\|{op_binary_only}
[e7aed49]	130	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
	131	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
[51b73452]	132
	133	%x COMMENT
[3848e0e]	134	%x BKQUOTE
	135	%x QUOTE
	136	%x STRING
[51b73452]	137
	138	%%
[994d080]	139	/* line directives */
[4040425]	140	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
[8c17ab0]	141	/* " stop highlighting */
[c1c1112]	142	static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b73452]	143	char *end_num;
	144	char begin_string, end_string;
	145	long lineno, length;
	146	lineno = strtol( yytext + 1, &end_num, 0 );
	147	begin_string = strchr( end_num, '"' );
[f487962]	148	if ( begin_string ) { // file name ?
	149	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
	150	assert( end_string ); // closing quote ?
	151	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
	152	assert( length < FILENAME_MAX ); // room for sentinel ?
	153	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
	154	filename[ length ] = '\0'; // terminate string with sentinel
	155	//std::cout << "file " << filename << " line " << lineno << std::endl;
	156	yylineno = lineno;
[c1c1112]	157	yyfilename = filename;
[b87a5ed]	158	} // if
[51b73452]	159	}
	160
[b87a5ed]	161	/* ignore preprocessor directives (for now) */
[51b73452]	162	^{h_white}"#"[^\n]"\n" ;
	163
[cd623a4]	164	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	165	"/*" { BEGIN COMMENT; }
[cd623a4]	166	<COMMENT>.\|\n ;
	167	<COMMENT>"*/" { BEGIN 0; }
[51b73452]	168
[cd623a4]	169	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	170	"//"[^\n]*"\n" ;
[51b73452]	171
[b87a5ed]	172	/* ignore whitespace */
[3848e0e]	173	{h_white}+ { WHITE_RETURN(' '); }
	174	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	175	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b73452]	176
[b87a5ed]	177	/* keywords */
	178	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	179	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	180	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	181	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	182	asm { KEYWORD_RETURN(ASM); }
	183	__asm { KEYWORD_RETURN(ASM); } // GCC
	184	__asm__ { KEYWORD_RETURN(ASM); } // GCC
[02e5ab6]	185	_At { KEYWORD_RETURN(AT); } // CFA
[b87a5ed]	186	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	187	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	188	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	189	auto { KEYWORD_RETURN(AUTO); }
[b87a5ed]	190	_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]	191	break { KEYWORD_RETURN(BREAK); }
	192	case { KEYWORD_RETURN(CASE); }
[b87a5ed]	193	catch { KEYWORD_RETURN(CATCH); } // CFA
[02e5ab6]	194	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
[3848e0e]	195	char { KEYWORD_RETURN(CHAR); }
[b87a5ed]	196	choose { KEYWORD_RETURN(CHOOSE); } // CFA
	197	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
	198	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
	199	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]	200	const { KEYWORD_RETURN(CONST); }
[b87a5ed]	201	__const { KEYWORD_RETURN(CONST); } // GCC
	202	__const__ { KEYWORD_RETURN(CONST); } // GCC
[3848e0e]	203	continue { KEYWORD_RETURN(CONTINUE); }
[e04b636]	204	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
[3848e0e]	205	default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]	206	disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]	207	do { KEYWORD_RETURN(DO); }
[3848e0e]	208	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	209	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	210	else { KEYWORD_RETURN(ELSE); }
[02e5ab6]	211	enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]	212	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	213	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[3848e0e]	214	extern { KEYWORD_RETURN(EXTERN); }
[08061589]	215	fallthrough { KEYWORD_RETURN(FALLTHRU); } // CFA
[b87a5ed]	216	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
	217	finally { KEYWORD_RETURN(FINALLY); } // CFA
[3848e0e]	218	float { KEYWORD_RETURN(FLOAT); }
[b87a5ed]	219	__float128 { KEYWORD_RETURN(FLOAT); } // GCC
	220	for { KEYWORD_RETURN(FOR); }
	221	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	222	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	223	ftype { KEYWORD_RETURN(FTYPE); } // CFA
	224	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	225	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	226	if { KEYWORD_RETURN(IF); }
	227	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	228	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	229	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	230	inline { KEYWORD_RETURN(INLINE); } // C99
	231	__inline { KEYWORD_RETURN(INLINE); } // GCC
	232	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	233	int { KEYWORD_RETURN(INT); }
	234	__int128 { KEYWORD_RETURN(INT); } // GCC
[b15f6cf]	235	__int128_t { KEYWORD_RETURN(INT); } // GCC
[b87a5ed]	236	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	237	long { KEYWORD_RETURN(LONG); }
[b87a5ed]	238	lvalue { KEYWORD_RETURN(LVALUE); } // CFA
[6016c87]	239	monitor { KEYWORD_RETURN(MONITOR); } // CFA
[a7c90d4]	240	mutex { KEYWORD_RETURN(MUTEX); } // CFA
[b87a5ed]	241	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]	242	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[3a2128f]	243	one_t { NUMERIC_RETURN(ONE_T); } // CFA
[4040425]	244	otype { KEYWORD_RETURN(OTYPE); } // CFA
[3848e0e]	245	register { KEYWORD_RETURN(REGISTER); }
[b87a5ed]	246	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	247	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	248	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	249	return { KEYWORD_RETURN(RETURN); }
	250	short { KEYWORD_RETURN(SHORT); }
	251	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	252	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	253	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	254	sizeof { KEYWORD_RETURN(SIZEOF); }
	255	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	256	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	257	struct { KEYWORD_RETURN(STRUCT); }
	258	switch { KEYWORD_RETURN(SWITCH); }
[bd4d011]	259	thread { KEYWORD_RETURN(THREAD); } // C11
[b87a5ed]	260	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	261	throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]	262	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[4040425]	263	trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]	264	try { KEYWORD_RETURN(TRY); } // CFA
[8f60f0b]	265	ttype { KEYWORD_RETURN(TTYPE); } // CFA
[3848e0e]	266	typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]	267	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	268	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	269	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[b15f6cf]	270	__uint128_t { KEYWORD_RETURN(INT); } // GCC
[3848e0e]	271	union { KEYWORD_RETURN(UNION); }
	272	unsigned { KEYWORD_RETURN(UNSIGNED); }
[90c3b1c]	273	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
[72457b6]	274	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
[3848e0e]	275	void { KEYWORD_RETURN(VOID); }
	276	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	277	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	278	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[3848e0e]	279	while { KEYWORD_RETURN(WHILE); }
[8b47e50]	280	with { KEYWORD_RETURN(WITH); } // CFA
[3a2128f]	281	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
[51b73452]	282
[b87a5ed]	283	/* identifier */
	284	{identifier} { IDENTIFIER_RETURN(); }
	285	{attr_identifier} { ATTRIBUTE_RETURN(); }
[c6b1105]	286	"`" { BEGIN BKQUOTE; }
[b87a5ed]	287	<BKQUOTE>{identifier} { IDENTIFIER_RETURN(); }
	288	<BKQUOTE>"`" { BEGIN 0; }
[51b73452]	289
[b87a5ed]	290	/* numeric constants */
[59db689]	291	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	292	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	293	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[1b29996]	294	{real_decimal} { NUMERIC_RETURN(REALDECIMALconstant); } // must appear before floating_constant
	295	{real_fraction} { NUMERIC_RETURN(REALFRACTIONconstant); } // must appear before floating_constant
[3848e0e]	296	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	297	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b73452]	298
[b87a5ed]	299	/* character constant, allows empty value */
[c1c1112]	300	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new std::string( yytext, yyleng ); }
	301	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
	302	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[b87a5ed]	303	/* ' stop highlighting */
[51b73452]	304
[b87a5ed]	305	/* string constant */
[c1c1112]	306	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new std::string( yytext, yyleng ); }
	307	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
	308	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[b87a5ed]	309	/* " stop highlighting */
[51b73452]	310
[59db689]	311	/* common character/string constant */
[c1c1112]	312	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]	313	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]	314	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]	315
[b87a5ed]	316	/* punctuation */
[615a096]	317	"@" { ASCIIOP_RETURN(); }
[b87a5ed]	318	"[" { ASCIIOP_RETURN(); }
	319	"]" { ASCIIOP_RETURN(); }
	320	"(" { ASCIIOP_RETURN(); }
	321	")" { ASCIIOP_RETURN(); }
	322	"{" { ASCIIOP_RETURN(); }
	323	"}" { ASCIIOP_RETURN(); }
	324	"," { ASCIIOP_RETURN(); } // also operator
	325	":" { ASCIIOP_RETURN(); }
	326	";" { ASCIIOP_RETURN(); }
	327	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	328	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	329
[b87a5ed]	330	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	331	"<:" { RETURN_VAL('['); }
	332	":>" { RETURN_VAL(']'); }
	333	"<%" { RETURN_VAL('{'); }
	334	"%>" { RETURN_VAL('}'); }
[51b73452]	335
[b87a5ed]	336	/* operators */
	337	"!" { ASCIIOP_RETURN(); }
	338	"+" { ASCIIOP_RETURN(); }
	339	"-" { ASCIIOP_RETURN(); }
	340	"*" { ASCIIOP_RETURN(); }
[e5f2a67]	341	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
[b87a5ed]	342	"/" { ASCIIOP_RETURN(); }
	343	"%" { ASCIIOP_RETURN(); }
	344	"^" { ASCIIOP_RETURN(); }
	345	"~" { ASCIIOP_RETURN(); }
	346	"&" { ASCIIOP_RETURN(); }
	347	"\|" { ASCIIOP_RETURN(); }
	348	"<" { ASCIIOP_RETURN(); }
	349	">" { ASCIIOP_RETURN(); }
	350	"=" { ASCIIOP_RETURN(); }
	351	"?" { ASCIIOP_RETURN(); }
[3848e0e]	352
	353	"++" { NAMEDOP_RETURN(ICR); }
	354	"--" { NAMEDOP_RETURN(DECR); }
	355	"==" { NAMEDOP_RETURN(EQ); }
	356	"!=" { NAMEDOP_RETURN(NE); }
	357	"<<" { NAMEDOP_RETURN(LS); }
	358	">>" { NAMEDOP_RETURN(RS); }
	359	"<=" { NAMEDOP_RETURN(LE); }
	360	">=" { NAMEDOP_RETURN(GE); }
	361	"&&" { NAMEDOP_RETURN(ANDAND); }
	362	"\|\|" { NAMEDOP_RETURN(OROR); }
	363	"->" { NAMEDOP_RETURN(ARROW); }
	364	"+=" { NAMEDOP_RETURN(PLUSassign); }
	365	"-=" { NAMEDOP_RETURN(MINUSassign); }
[e5f2a67]	366	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
[3848e0e]	367	"*=" { NAMEDOP_RETURN(MULTassign); }
	368	"/=" { NAMEDOP_RETURN(DIVassign); }
	369	"%=" { NAMEDOP_RETURN(MODassign); }
	370	"&=" { NAMEDOP_RETURN(ANDassign); }
	371	"\|=" { NAMEDOP_RETURN(ORassign); }
	372	"^=" { NAMEDOP_RETURN(ERassign); }
	373	"<<=" { NAMEDOP_RETURN(LSassign); }
	374	">>=" { NAMEDOP_RETURN(RSassign); }
[51b73452]	375
[08061589]	376	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[097e2b0]	377
[b87a5ed]	378	/* CFA, operator identifier */
	379	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	380	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[02e5ab6]	381	"^?{}" { IDENTIFIER_RETURN(); }
[b87a5ed]	382	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b73452]	383	/*
[daf9671]	384	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
	385	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
	386	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
	387	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
	388	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
	389	identifier to disambiguate this common case.
	390
	391	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
	392	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
	393	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
	394	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
	395	any meaningful program.
	396
	397	The remaining cases are with the increment/decrement operators and conditional expression:
	398
	399	i++? ...(...);
	400	i?++ ...(...);
	401
	402	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
	403	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
	404	space:
	405
	406	i++ ? i : 0;
	407	i? ++i : 0;
[51b73452]	408	*/
[daf9671]	409	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
[b87a5ed]	410	// 1 or 2 character unary operator ?
	411	int i = yytext[1] == '?' ? 1 : 2;
	412	yyless( i ); // put back characters up to first '?'
	413	if ( i > 1 ) {
	414	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	415	} else {
	416	ASCIIOP_RETURN();
	417	} // if
	418	}
	419
	420	/* unknown characters */
[a2e0687]	421	. { printf("unknown character(s):\"%s\" on line %d\n", yytext, yylineno); }
[51b73452]	422
	423	%%
	424
[b87a5ed]	425	// Local Variables: //
	426	// mode: c++ //
[de62360d]	427	// tab-width: 4 //
[b87a5ed]	428	// compile-command: "make install" //
	429	// End: //

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