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lex.ll @ a506df4

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsdeferred_resndemanglerenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newwith_gc

Last change on this file since a506df4 was 76c62b2, checked in by Peter A. Buhr <pabuhr@…>, 7 years ago
first attempt at user-defined constants (units)
Property mode set to `100644`
File size: 17.6 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	*
[51b7345]	9	* Author : Peter A. Buhr
	10	* Created On : Sat Sep 22 08:58:10 2001
[926af74]	11	* Last Modified By : Peter A. Buhr
[76c62b2]	12	* Last Modified On : Thu Aug 31 21:30:10 2017
	13	* Update Count : 598
[51b7345]	14	*/
	15
	16	%option yylineno
[4e9c7c1]	17	%option noyywrap
[5f2f2d7]	18	%option nounput
[51b7345]	19
	20	%{
[9ed4f94]	21	// The lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive have been
[de62360d]	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.
[51b7345]	24
[8c17ab0]	25	//************************** Includes and Defines **************************
[51b7345]	26
[9ed4f94]	27	unsigned int column = 0; // position of the end of the last token parsed
	28	#define YY_USER_ACTION column += yyleng; // trigger before each matching rule's action
	29
[51b7345]	30	#include <string>
[f487962]	31	#include <cstdio> // FILENAME_MAX
[9ed4f94]	32	using namespace std;
[51b7345]	33
[984dce6]	34	#include "ParseNode.h"
	35	#include "TypedefTable.h"
[51b7345]	36
	37	char *yyfilename;
[9ed4f94]	38	string *strtext; // accumulate parts of character and string constant value
[51b7345]	39
[de62360d]	40	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
[9ed4f94]	41	#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
[926af74]	42	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
[de62360d]	43	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
[5f2f2d7]	44
[f487962]	45	#define WHITE_RETURN(x) // do nothing
[9ed4f94]	46	#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
[de62360d]	47	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
[f487962]	48	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
[de62360d]	49	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
	50	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
[5b2edbc]	51	#define QKEYWORD_RETURN(x) typedefTable.isKind( yytext ); RETURN_VAL(x); // quasi-keyword
[984dce6]	52	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
[de62360d]	53	#define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER )
[51b7345]	54
[3848e0e]	55	void rm_underscore() {
[e7aed49]	56	// Remove underscores in numeric constant by copying the non-underscore characters to the front of the string.
	57	yyleng = 0;
[b87a5ed]	58	for ( int i = 0; yytext[i] != '\0'; i += 1 ) {
[76c62b2]	59	if ( yytext[i] == '`' ) {
	60	// copy user suffix
	61	for ( ; yytext[i] != '\0'; i += 1 ) {
	62	yytext[yyleng] = yytext[i];
	63	yyleng += 1;
	64	} // for
	65	break;
	66	} // if
[b87a5ed]	67	if ( yytext[i] != '_' ) {
[e7aed49]	68	yytext[yyleng] = yytext[i];
	69	yyleng += 1;
[b87a5ed]	70	} // if
	71	} // for
	72	yytext[yyleng] = '\0';
[51b7345]	73	}
	74
[7812f1d1]	75	// Stop warning due to incorrectly generated flex code.
	76	#pragma GCC diagnostic ignored "-Wsign-compare"
[51b7345]	77	%}
	78
	79	octal [0-7]
	80	nonzero [1-9]
	81	decimal [0-9]
	82	hex [0-9a-fA-F]
[3848e0e]	83	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
[51b7345]	84
[b87a5ed]	85	// identifier, GCC: $ in identifier
[51b7345]	86	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
	87
[b87a5ed]	88	// attribute identifier, GCC: $ in identifier
[51b7345]	89	attr_identifier "@"{identifier}
	90
[76c62b2]	91	user_suffix_opt ("`"{identifier})?
	92
[b87a5ed]	93	// numeric constants, CFA: '_' in constant
[3848e0e]	94	hex_quad {hex}("_"?{hex}){3}
[76c62b2]	95	integer_suffix_opt ("_"?(([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]?))))?
[51b7345]	96
	97	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	98	octal_prefix "0""_"?
[76c62b2]	99	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix_opt}{user_suffix_opt}
[51b7345]	100
	101	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
[76c62b2]	102	decimal_constant {nonzero_digits}{integer_suffix_opt}{user_suffix_opt}
[51b7345]	103
	104	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	105	hex_prefix "0"[xX]"_"?
[76c62b2]	106	hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}{user_suffix_opt}
[51b7345]	107
[76c62b2]	108	// GCC: D (double) and iI (imaginary) suffixes, and DL (long double)
	109	floating_suffix_opt ("_"?([fFdDlL][iI]?\|[iI][lLfFdD]?\|"DL"))?
[51b7345]	110	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
[76c62b2]	111	real_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}{user_suffix_opt}
	112	real_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}{user_suffix_opt}
[0213af6]	113	real_constant {decimal_digits}{real_fraction}
[51b7345]	114	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[76c62b2]	115	floating_constant (({real_constant}{exponent}?)\|({decimal_digits}{exponent})){floating_suffix_opt}{user_suffix_opt}
[51b7345]	116
	117	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
	118	hex_fractional_constant ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
[76c62b2]	119	hex_floating_constant {hex_prefix}(({hex_fractional_constant}{binary_exponent})\|({hex_digits}{binary_exponent})){floating_suffix_opt}
[51b7345]	120
[b87a5ed]	121	// character escape sequence, GCC: \e => esc character
[51b7345]	122	simple_escape "\\"[abefnrtv'"?\\]
[b87a5ed]	123	// ' stop highlighting
[3848e0e]	124	octal_escape "\\"{octal}("_"?{octal}){0,2}
	125	hex_escape "\\""x""_"?{hex_digits}
[51b7345]	126	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	127	cwide_prefix "L"\|"U"\|"u"
	128	swide_prefix {cwide_prefix}\|"u8"
[51b7345]	129
[b87a5ed]	130	// display/white-space characters
[51b7345]	131	h_tab [\011]
	132	form_feed [\014]
	133	v_tab [\013]
	134	c_return [\015]
	135	h_white [ ]\|{h_tab}
	136
[e7aed49]	137	// overloadable operators
[51b7345]	138	op_unary_only "~"\|"!"
	139	op_unary_binary "+"\|"-"\|"*"
	140	op_unary_pre_post "++"\|"--"
	141	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	142
[994d080]	143	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
[51b7345]	144	op_binary_over {op_unary_binary}\|{op_binary_only}
[e7aed49]	145	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
	146	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
[51b7345]	147
	148	%x COMMENT
[3848e0e]	149	%x BKQUOTE
	150	%x QUOTE
	151	%x STRING
[51b7345]	152
	153	%%
[994d080]	154	/* line directives */
[4040425]	155	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
[8c17ab0]	156	/* " stop highlighting */
[c1c1112]	157	static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b7345]	158	char *end_num;
	159	char begin_string, end_string;
	160	long lineno, length;
	161	lineno = strtol( yytext + 1, &end_num, 0 );
	162	begin_string = strchr( end_num, '"' );
[f487962]	163	if ( begin_string ) { // file name ?
	164	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
	165	assert( end_string ); // closing quote ?
	166	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
	167	assert( length < FILENAME_MAX ); // room for sentinel ?
	168	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
	169	filename[ length ] = '\0'; // terminate string with sentinel
[9ed4f94]	170	//cout << "file " << filename << " line " << lineno << endl;
[f487962]	171	yylineno = lineno;
[c1c1112]	172	yyfilename = filename;
[b87a5ed]	173	} // if
[51b7345]	174	}
	175
[b87a5ed]	176	/* ignore preprocessor directives (for now) */
[51b7345]	177	^{h_white}"#"[^\n]"\n" ;
	178
[cd623a4]	179	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	180	"/*" { BEGIN COMMENT; }
[cd623a4]	181	<COMMENT>.\|\n ;
	182	<COMMENT>"*/" { BEGIN 0; }
[51b7345]	183
[cd623a4]	184	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	185	"//"[^\n]*"\n" ;
[51b7345]	186
[b87a5ed]	187	/* ignore whitespace */
[3848e0e]	188	{h_white}+ { WHITE_RETURN(' '); }
	189	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	190	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b7345]	191
[b87a5ed]	192	/* keywords */
	193	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	194	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	195	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	196	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	197	asm { KEYWORD_RETURN(ASM); }
	198	__asm { KEYWORD_RETURN(ASM); } // GCC
	199	__asm__ { KEYWORD_RETURN(ASM); } // GCC
[02e5ab6]	200	_At { KEYWORD_RETURN(AT); } // CFA
[b87a5ed]	201	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	202	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	203	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	204	auto { KEYWORD_RETURN(AUTO); }
[b87a5ed]	205	_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]	206	break { KEYWORD_RETURN(BREAK); }
	207	case { KEYWORD_RETURN(CASE); }
[b87a5ed]	208	catch { KEYWORD_RETURN(CATCH); } // CFA
[02e5ab6]	209	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
[3848e0e]	210	char { KEYWORD_RETURN(CHAR); }
[b87a5ed]	211	choose { KEYWORD_RETURN(CHOOSE); } // CFA
	212	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
	213	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
	214	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]	215	const { KEYWORD_RETURN(CONST); }
[b87a5ed]	216	__const { KEYWORD_RETURN(CONST); } // GCC
	217	__const__ { KEYWORD_RETURN(CONST); } // GCC
[3848e0e]	218	continue { KEYWORD_RETURN(CONTINUE); }
[e04b636]	219	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
[3848e0e]	220	default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]	221	disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]	222	do { KEYWORD_RETURN(DO); }
[3848e0e]	223	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	224	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	225	else { KEYWORD_RETURN(ELSE); }
[02e5ab6]	226	enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]	227	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	228	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[3848e0e]	229	extern { KEYWORD_RETURN(EXTERN); }
[08061589]	230	fallthrough { KEYWORD_RETURN(FALLTHRU); } // CFA
[b87a5ed]	231	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
	232	finally { KEYWORD_RETURN(FINALLY); } // CFA
[3848e0e]	233	float { KEYWORD_RETURN(FLOAT); }
[b87a5ed]	234	__float128 { KEYWORD_RETURN(FLOAT); } // GCC
	235	for { KEYWORD_RETURN(FOR); }
	236	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	237	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	238	ftype { KEYWORD_RETURN(FTYPE); } // CFA
	239	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	240	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	241	if { KEYWORD_RETURN(IF); }
	242	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	243	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	244	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	245	inline { KEYWORD_RETURN(INLINE); } // C99
	246	__inline { KEYWORD_RETURN(INLINE); } // GCC
	247	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	248	int { KEYWORD_RETURN(INT); }
	249	__int128 { KEYWORD_RETURN(INT); } // GCC
[b15f6cf]	250	__int128_t { KEYWORD_RETURN(INT); } // GCC
[b87a5ed]	251	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	252	long { KEYWORD_RETURN(LONG); }
[6016c87]	253	monitor { KEYWORD_RETURN(MONITOR); } // CFA
[a7c90d4]	254	mutex { KEYWORD_RETURN(MUTEX); } // CFA
[b87a5ed]	255	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]	256	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[3a2128f]	257	one_t { NUMERIC_RETURN(ONE_T); } // CFA
[4040425]	258	otype { KEYWORD_RETURN(OTYPE); } // CFA
[3848e0e]	259	register { KEYWORD_RETURN(REGISTER); }
[b87a5ed]	260	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	261	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	262	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	263	return { KEYWORD_RETURN(RETURN); }
	264	short { KEYWORD_RETURN(SHORT); }
	265	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	266	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	267	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	268	sizeof { KEYWORD_RETURN(SIZEOF); }
	269	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	270	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	271	struct { KEYWORD_RETURN(STRUCT); }
	272	switch { KEYWORD_RETURN(SWITCH); }
[bd4d011]	273	thread { KEYWORD_RETURN(THREAD); } // C11
[b87a5ed]	274	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	275	throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]	276	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[5b2edbc]	277	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
[4040425]	278	trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]	279	try { KEYWORD_RETURN(TRY); } // CFA
[8f60f0b]	280	ttype { KEYWORD_RETURN(TTYPE); } // CFA
[3848e0e]	281	typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]	282	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	283	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	284	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[b15f6cf]	285	__uint128_t { KEYWORD_RETURN(INT); } // GCC
[3848e0e]	286	union { KEYWORD_RETURN(UNION); }
	287	unsigned { KEYWORD_RETURN(UNSIGNED); }
[90c3b1c]	288	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
[72457b6]	289	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
[3848e0e]	290	void { KEYWORD_RETURN(VOID); }
	291	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	292	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	293	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[5b2edbc]	294	waitfor { KEYWORD_RETURN(WAITFOR); }
	295	or { QKEYWORD_RETURN(WOR); } // CFA
	296	when { KEYWORD_RETURN(WHEN); }
[3848e0e]	297	while { KEYWORD_RETURN(WHILE); }
[8b47e50]	298	with { KEYWORD_RETURN(WITH); } // CFA
[3a2128f]	299	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
[51b7345]	300
[b87a5ed]	301	/* identifier */
	302	{identifier} { IDENTIFIER_RETURN(); }
	303	{attr_identifier} { ATTRIBUTE_RETURN(); }
[c6b1105]	304	"`" { BEGIN BKQUOTE; }
[b87a5ed]	305	<BKQUOTE>{identifier} { IDENTIFIER_RETURN(); }
	306	<BKQUOTE>"`" { BEGIN 0; }
[51b7345]	307
[b87a5ed]	308	/* numeric constants */
[59db689]	309	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	310	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	311	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[1b29996]	312	{real_decimal} { NUMERIC_RETURN(REALDECIMALconstant); } // must appear before floating_constant
	313	{real_fraction} { NUMERIC_RETURN(REALFRACTIONconstant); } // must appear before floating_constant
[3848e0e]	314	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	315	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b7345]	316
[b87a5ed]	317	/* character constant, allows empty value */
[9ed4f94]	318	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	319	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
[76c62b2]	320	<QUOTE>['\n]{user_suffix_opt} { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[b87a5ed]	321	/* ' stop highlighting */
[51b7345]	322
[b87a5ed]	323	/* string constant */
[9ed4f94]	324	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	325	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
[76c62b2]	326	<STRING>["\n]{user_suffix_opt} { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[b87a5ed]	327	/* " stop highlighting */
[51b7345]	328
[59db689]	329	/* common character/string constant */
[c1c1112]	330	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]	331	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]	332	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]	333
[b87a5ed]	334	/* punctuation */
[615a096]	335	"@" { ASCIIOP_RETURN(); }
[b87a5ed]	336	"[" { ASCIIOP_RETURN(); }
	337	"]" { ASCIIOP_RETURN(); }
	338	"(" { ASCIIOP_RETURN(); }
	339	")" { ASCIIOP_RETURN(); }
	340	"{" { ASCIIOP_RETURN(); }
	341	"}" { ASCIIOP_RETURN(); }
	342	"," { ASCIIOP_RETURN(); } // also operator
	343	":" { ASCIIOP_RETURN(); }
	344	";" { ASCIIOP_RETURN(); }
	345	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	346	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	347
[b87a5ed]	348	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	349	"<:" { RETURN_VAL('['); }
	350	":>" { RETURN_VAL(']'); }
	351	"<%" { RETURN_VAL('{'); }
	352	"%>" { RETURN_VAL('}'); }
[51b7345]	353
[b87a5ed]	354	/* operators */
	355	"!" { ASCIIOP_RETURN(); }
	356	"+" { ASCIIOP_RETURN(); }
	357	"-" { ASCIIOP_RETURN(); }
	358	"*" { ASCIIOP_RETURN(); }
[e5f2a67]	359	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
[b87a5ed]	360	"/" { ASCIIOP_RETURN(); }
	361	"%" { ASCIIOP_RETURN(); }
	362	"^" { ASCIIOP_RETURN(); }
	363	"~" { ASCIIOP_RETURN(); }
	364	"&" { ASCIIOP_RETURN(); }
	365	"\|" { ASCIIOP_RETURN(); }
	366	"<" { ASCIIOP_RETURN(); }
	367	">" { ASCIIOP_RETURN(); }
	368	"=" { ASCIIOP_RETURN(); }
	369	"?" { ASCIIOP_RETURN(); }
[3848e0e]	370
	371	"++" { NAMEDOP_RETURN(ICR); }
	372	"--" { NAMEDOP_RETURN(DECR); }
	373	"==" { NAMEDOP_RETURN(EQ); }
	374	"!=" { NAMEDOP_RETURN(NE); }
	375	"<<" { NAMEDOP_RETURN(LS); }
	376	">>" { NAMEDOP_RETURN(RS); }
	377	"<=" { NAMEDOP_RETURN(LE); }
	378	">=" { NAMEDOP_RETURN(GE); }
	379	"&&" { NAMEDOP_RETURN(ANDAND); }
	380	"\|\|" { NAMEDOP_RETURN(OROR); }
	381	"->" { NAMEDOP_RETURN(ARROW); }
	382	"+=" { NAMEDOP_RETURN(PLUSassign); }
	383	"-=" { NAMEDOP_RETURN(MINUSassign); }
[e5f2a67]	384	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
[3848e0e]	385	"*=" { NAMEDOP_RETURN(MULTassign); }
	386	"/=" { NAMEDOP_RETURN(DIVassign); }
	387	"%=" { NAMEDOP_RETURN(MODassign); }
	388	"&=" { NAMEDOP_RETURN(ANDassign); }
	389	"\|=" { NAMEDOP_RETURN(ORassign); }
	390	"^=" { NAMEDOP_RETURN(ERassign); }
	391	"<<=" { NAMEDOP_RETURN(LSassign); }
	392	">>=" { NAMEDOP_RETURN(RSassign); }
[51b7345]	393
[08061589]	394	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[097e2b0]	395
[b87a5ed]	396	/* CFA, operator identifier */
	397	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	398	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[76c62b2]	399	"^?{}" { IDENTIFIER_RETURN(); }
	400	"?`"{identifier} { IDENTIFIER_RETURN(); } // unit operator
[b87a5ed]	401	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b7345]	402	/*
[daf9671]	403	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
	404	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
	405	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
	406	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
	407	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
	408	identifier to disambiguate this common case.
	409
	410	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
	411	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
	412	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
	413	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
	414	any meaningful program.
	415
	416	The remaining cases are with the increment/decrement operators and conditional expression:
	417
	418	i++? ...(...);
	419	i?++ ...(...);
	420
	421	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
	422	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
	423	space:
	424
	425	i++ ? i : 0;
	426	i? ++i : 0;
[51b7345]	427	*/
[daf9671]	428	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
[b87a5ed]	429	// 1 or 2 character unary operator ?
	430	int i = yytext[1] == '?' ? 1 : 2;
	431	yyless( i ); // put back characters up to first '?'
	432	if ( i > 1 ) {
	433	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	434	} else {
	435	ASCIIOP_RETURN();
	436	} // if
	437	}
	438
[9ed4f94]	439	/* unknown character */
	440	. { yyerror( "unknown character" ); }
[51b7345]	441
	442	%%
[9ed4f94]	443	// ----end of lexer----
	444
	445	void yyerror( const char * errmsg ) {
	446	cout << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
[ad28abb]	447	<< ": " << SemanticError::error_str() << errmsg << " at token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
[9ed4f94]	448	}
[51b7345]	449
[b87a5ed]	450	// Local Variables: //
	451	// mode: c++ //
[de62360d]	452	// tab-width: 4 //
[b87a5ed]	453	// compile-command: "make install" //
	454	// End: //

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