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lex.ll @ 3249dd8b

ADTast-experimentalenumforall-pointer-decaypthread-emulationqualifiedEnum

Last change on this file since 3249dd8b was 15f769c, checked in by Peter A. Buhr <pabuhr@…>, 3 years ago
add _DecimalXX to lexer/parser, but mark as unimplemented
Property mode set to `100644`
File size: 19.9 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
[15f769c]	12	* Last Modified On : Sun Jun 20 18:41:09 2021
	13	* Update Count : 759
[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
[4439008]	27	// trigger before each matching rule's action
	28	#define YY_USER_ACTION \
	29	yylloc.first_line = yylineno; \
	30	yylloc.first_column = column; \
	31	column += yyleng; \
	32	yylloc.last_column = column; \
	33	yylloc.last_line = yylineno; \
	34	yylloc.filename = yyfilename ? yyfilename : "";
[9ed4f94]	35	unsigned int column = 0; // position of the end of the last token parsed
	36
[51b7345]	37	#include <string>
[f487962]	38	#include <cstdio> // FILENAME_MAX
[9ed4f94]	39	using namespace std;
[51b7345]	40
[ba01b14]	41	#include "config.h" // configure info
[984dce6]	42	#include "ParseNode.h"
	43	#include "TypedefTable.h"
[51b7345]	44
[60a8062]	45	string * build_postfix_name( string * name );
	46
[51b7345]	47	char *yyfilename;
[9ed4f94]	48	string *strtext; // accumulate parts of character and string constant value
[51b7345]	49
[de62360d]	50	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
[9ed4f94]	51	#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
[926af74]	52	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
[de62360d]	53	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
[5f2f2d7]	54
[f487962]	55	#define WHITE_RETURN(x) // do nothing
[9ed4f94]	56	#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
[de62360d]	57	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
[f487962]	58	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
[de62360d]	59	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
	60	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
[4439008]	61	#define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword
[984dce6]	62	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
[51b7345]	63
[25744d2]	64	#ifdef HAVE_KEYWORDS_FLOATXX // GCC >= 7 => keyword, otherwise typedef
[ba01b14]	65	#define FLOATXX(v) KEYWORD_RETURN(v);
	66	#else
[37cdd97]	67	#define FLOATXX(v) IDENTIFIER_RETURN();
[ba01b14]	68	#endif // HAVE_KEYWORDS_FLOATXX
	69
[3848e0e]	70	void rm_underscore() {
[7e419e7]	71	// SKULLDUGGERY: remove underscores (ok to shorten?)
[e7aed49]	72	yyleng = 0;
[7e419e7]	73	for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string
[b87a5ed]	74	if ( yytext[i] != '_' ) {
[e7aed49]	75	yytext[yyleng] = yytext[i];
	76	yyleng += 1;
[b87a5ed]	77	} // if
	78	} // for
	79	yytext[yyleng] = '\0';
[7e419e7]	80	} // rm_underscore
[51b7345]	81
[7812f1d1]	82	// Stop warning due to incorrectly generated flex code.
	83	#pragma GCC diagnostic ignored "-Wsign-compare"
[51b7345]	84	%}
	85
[0a2168f]	86	binary [0-1]
[51b7345]	87	octal [0-7]
	88	nonzero [1-9]
	89	decimal [0-9]
	90	hex [0-9a-fA-F]
[3848e0e]	91	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
[51b7345]	92
[b87a5ed]	93	// identifier, GCC: $ in identifier
[51b7345]	94	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
	95
[b87a5ed]	96	// numeric constants, CFA: '_' in constant
[3848e0e]	97	hex_quad {hex}("_"?{hex}){3}
[201aeb9]	98	size_opt (8\|16\|32\|64\|128)?
[0a616e0]	99	// CFA: explicit l8/l16/l32/l64/l128, char 'hh', short 'h', int 'n'
[f56c32e]	100	length ("ll"\|"LL"\|[lL]{size_opt})\|("hh"\|"HH"\|[hHnN])
[0a616e0]	101	// CFA: size_t 'z', pointer 'p', which define a sign and length
	102	integer_suffix_opt ("_"?(([uU]({length}?[iI]?)\|([iI]{length}))\|([iI]({length}?[uU]?)\|([uU]{length}))\|({length}([iI]?[uU]?)\|([uU][iI]))\|[zZ]\|[pP]))?
[51b7345]	103
	104	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	105	octal_prefix "0""_"?
[930f69e]	106	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix_opt}
[51b7345]	107
	108	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
[930f69e]	109	decimal_constant {nonzero_digits}{integer_suffix_opt}
[51b7345]	110
[0a2168f]	111	binary_digits ({binary})\|({binary}({binary}\|"_")*{binary})
	112	binary_prefix "0"[bB]"_"?
	113	binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt}
	114
[51b7345]	115	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	116	hex_prefix "0"[xX]"_"?
[930f69e]	117	hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
[51b7345]	118
[d3b5a14]	119	// GCC: floating D (double), imaginary iI, and decimal floating DF, DD, DL
[51b7345]	120	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[ba01b14]	121	floating_size 16\|32\|32x\|64\|64x\|80\|128\|128x
	122	floating_length ([fFdDlLwWqQ]\|[fF]{floating_size})
[201aeb9]	123	floating_suffix ({floating_length}?[iI]?)\|([iI]{floating_length})
[d3b5a14]	124	decimal_floating_suffix [dD][fFdDlL]
	125	floating_suffix_opt ("_"?({floating_suffix}\|{decimal_floating_suffix}))?
[f4b77f2]	126	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
[930f69e]	127	floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
	128	floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
	129	floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})\|({decimal_digits}{floating_fraction})
[51b7345]	130
	131	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
[dc7db63]	132	hex_floating_suffix_opt ("_"?({floating_suffix}))?
[930f69e]	133	hex_floating_fraction ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
[f4b77f2]	134	hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})\|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
[51b7345]	135
[b87a5ed]	136	// character escape sequence, GCC: \e => esc character
[51b7345]	137	simple_escape "\\"[abefnrtv'"?\\]
[930f69e]	138	// ' stop editor highlighting
[3848e0e]	139	octal_escape "\\"{octal}("_"?{octal}){0,2}
	140	hex_escape "\\""x""_"?{hex_digits}
[51b7345]	141	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	142	cwide_prefix "L"\|"U"\|"u"
	143	swide_prefix {cwide_prefix}\|"u8"
[51b7345]	144
[b87a5ed]	145	// display/white-space characters
[51b7345]	146	h_tab [\011]
	147	form_feed [\014]
	148	v_tab [\013]
	149	c_return [\015]
	150	h_white [ ]\|{h_tab}
	151
[e7aed49]	152	// overloadable operators
[51b7345]	153	op_unary_only "~"\|"!"
	154	op_unary_binary "+"\|"-"\|"*"
	155	op_unary_pre_post "++"\|"--"
	156	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	157
[994d080]	158	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
[51b7345]	159	op_binary_over {op_unary_binary}\|{op_binary_only}
[e7aed49]	160	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
	161	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
[51b7345]	162
	163	%x COMMENT
[3848e0e]	164	%x BKQUOTE
	165	%x QUOTE
	166	%x STRING
[51b7345]	167
	168	%%
[994d080]	169	/* line directives */
[4040425]	170	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
[930f69e]	171	/* " stop editor highlighting */
[c1c1112]	172	static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b7345]	173	char *end_num;
	174	char begin_string, end_string;
	175	long lineno, length;
	176	lineno = strtol( yytext + 1, &end_num, 0 );
	177	begin_string = strchr( end_num, '"' );
[f487962]	178	if ( begin_string ) { // file name ?
	179	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
	180	assert( end_string ); // closing quote ?
	181	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
	182	assert( length < FILENAME_MAX ); // room for sentinel ?
	183	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
	184	filename[ length ] = '\0'; // terminate string with sentinel
[9ed4f94]	185	//cout << "file " << filename << " line " << lineno << endl;
[f487962]	186	yylineno = lineno;
[c1c1112]	187	yyfilename = filename;
[b87a5ed]	188	} // if
[51b7345]	189	}
	190
[637dd9c]	191	/* preprocessor-style directives */
[61fc4f6]	192	^{h_white}"#"[^\n]"\n" { RETURN_VAL( DIRECTIVE ); }
[51b7345]	193
[cd623a4]	194	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	195	"/*" { BEGIN COMMENT; }
[cd623a4]	196	<COMMENT>.\|\n ;
	197	<COMMENT>"*/" { BEGIN 0; }
[51b7345]	198
[cd623a4]	199	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	200	"//"[^\n]*"\n" ;
[51b7345]	201
[b87a5ed]	202	/* ignore whitespace */
[3848e0e]	203	{h_white}+ { WHITE_RETURN(' '); }
	204	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	205	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b7345]	206
[b87a5ed]	207	/* keywords */
	208	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	209	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	210	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	211	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	212	asm { KEYWORD_RETURN(ASM); }
	213	__asm { KEYWORD_RETURN(ASM); } // GCC
	214	__asm__ { KEYWORD_RETURN(ASM); } // GCC
	215	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	216	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	217	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	218	auto { KEYWORD_RETURN(AUTO); }
[f673c13c]	219	__auto_type { KEYWORD_RETURN(AUTO_TYPE); }
[b6ad601]	220	basetypeof { KEYWORD_RETURN(BASETYPEOF); } // CFA
[b87a5ed]	221	_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]	222	break { KEYWORD_RETURN(BREAK); }
	223	case { KEYWORD_RETURN(CASE); }
[9fb1367]	224	catch { QKEYWORD_RETURN(CATCH); } // CFA
	225	catchResume { QKEYWORD_RETURN(CATCHRESUME); } // CFA
[3848e0e]	226	char { KEYWORD_RETURN(CHAR); }
[b87a5ed]	227	choose { KEYWORD_RETURN(CHOOSE); } // CFA
[1528a2c]	228	coerce { KEYWORD_RETURN(COERCE); } // CFA
[b87a5ed]	229	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
	230	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
	231	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]	232	const { KEYWORD_RETURN(CONST); }
[b87a5ed]	233	__const { KEYWORD_RETURN(CONST); } // GCC
	234	__const__ { KEYWORD_RETURN(CONST); } // GCC
[3848e0e]	235	continue { KEYWORD_RETURN(CONTINUE); }
[e04b636]	236	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
[15f769c]	237	_Decimal32 { KEYWORD_RETURN(DECIMAL32); } // GCC
	238	_Decimal64 { KEYWORD_RETURN(DECIMAL64); } // GCC
	239	_Decimal128 { KEYWORD_RETURN(DECIMAL128); } // GCC
[3848e0e]	240	default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]	241	disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]	242	do { KEYWORD_RETURN(DO); }
[3848e0e]	243	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	244	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	245	else { KEYWORD_RETURN(ELSE); }
[02e5ab6]	246	enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]	247	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	248	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[c27fb59]	249	exception { KEYWORD_RETURN(EXCEPTION); } // CFA
[3848e0e]	250	extern { KEYWORD_RETURN(EXTERN); }
[bd7f401]	251	fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
[35f730f]	252	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
[9fb1367]	253	finally { QKEYWORD_RETURN(FINALLY); } // CFA
	254	fixup { QKEYWORD_RETURN(FIXUP); } // CFA
[3848e0e]	255	float { KEYWORD_RETURN(FLOAT); }
[e15853c]	256	__float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
	257	float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
	258	__float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
	259	float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
	260	_Float16 { FLOATXX(uFLOAT16); } // GCC
	261	_Float32 { FLOATXX(uFLOAT32); } // GCC
	262	_Float32x { FLOATXX(uFLOAT32X); } // GCC
	263	_Float64 { FLOATXX(uFLOAT64); } // GCC
	264	_Float64x { FLOATXX(uFLOAT64X); } // GCC
	265	_Float128 { FLOATXX(uFLOAT128); } // GCC
	266	_Float128x { FLOATXX(uFLOAT128); } // GCC
[b87a5ed]	267	for { KEYWORD_RETURN(FOR); }
	268	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	269	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	270	ftype { KEYWORD_RETURN(FTYPE); } // CFA
[553772b]	271	generator { KEYWORD_RETURN(GENERATOR); } // CFA
[b87a5ed]	272	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	273	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	274	if { KEYWORD_RETURN(IF); }
	275	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	276	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	277	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	278	inline { KEYWORD_RETURN(INLINE); } // C99
	279	__inline { KEYWORD_RETURN(INLINE); } // GCC
	280	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	281	int { KEYWORD_RETURN(INT); }
[f1da02c]	282	int128 { KEYWORD_RETURN(INT128); } // CFA
[201aeb9]	283	__int128 { KEYWORD_RETURN(INT128); } // GCC
[f1da02c]	284	__int128_t { KEYWORD_RETURN(INT128); } // GCC
[b87a5ed]	285	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	286	long { KEYWORD_RETURN(LONG); }
[6016c87]	287	monitor { KEYWORD_RETURN(MONITOR); } // CFA
[a7c90d4]	288	mutex { KEYWORD_RETURN(MUTEX); } // CFA
[b87a5ed]	289	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]	290	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[3a2128f]	291	one_t { NUMERIC_RETURN(ONE_T); } // CFA
[ce28c7b]	292	or { QKEYWORD_RETURN(WOR); } // CFA
[4040425]	293	otype { KEYWORD_RETURN(OTYPE); } // CFA
[9fb1367]	294	recover { QKEYWORD_RETURN(RECOVER); } // CFA
[3848e0e]	295	register { KEYWORD_RETURN(REGISTER); }
[9fb1367]	296	report { KEYWORD_RETURN(THROWRESUME); } // CFA
[b87a5ed]	297	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	298	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	299	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	300	return { KEYWORD_RETURN(RETURN); }
[25744d2]	301	/* resume { KEYWORD_RETURN(RESUME); } // CFA */
[3848e0e]	302	short { KEYWORD_RETURN(SHORT); }
	303	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	304	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	305	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	306	sizeof { KEYWORD_RETURN(SIZEOF); }
	307	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	308	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	309	struct { KEYWORD_RETURN(STRUCT); }
[37cdd97]	310	suspend { KEYWORD_RETURN(SUSPEND); } // CFA
[3848e0e]	311	switch { KEYWORD_RETURN(SWITCH); }
[bd4d011]	312	thread { KEYWORD_RETURN(THREAD); } // C11
[b87a5ed]	313	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	314	throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]	315	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[5b2edbc]	316	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
[4040425]	317	trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]	318	try { KEYWORD_RETURN(TRY); } // CFA
[8f60f0b]	319	ttype { KEYWORD_RETURN(TTYPE); } // CFA
[3848e0e]	320	typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]	321	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	322	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	323	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[1f652a7]	324	typeid { KEYWORD_RETURN(TYPEID); } // GCC
[3848e0e]	325	union { KEYWORD_RETURN(UNION); }
[f1da02c]	326	__uint128_t { KEYWORD_RETURN(UINT128); } // GCC
[3848e0e]	327	unsigned { KEYWORD_RETURN(UNSIGNED); }
[90c3b1c]	328	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
[72457b6]	329	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
[3848e0e]	330	void { KEYWORD_RETURN(VOID); }
	331	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	332	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	333	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[1f652a7]	334	vtable { KEYWORD_RETURN(VTABLE); } // CFA
[9fb1367]	335	waitfor { KEYWORD_RETURN(WAITFOR); } // CFA
	336	when { KEYWORD_RETURN(WHEN); } // CFA
[3848e0e]	337	while { KEYWORD_RETURN(WHILE); }
[8b47e50]	338	with { KEYWORD_RETURN(WITH); } // CFA
[3a2128f]	339	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
[51b7345]	340
[b87a5ed]	341	/* identifier */
	342	{identifier} { IDENTIFIER_RETURN(); }
[095ac99]	343	"``"{identifier} { // CFA
	344	yytext[yyleng] = '\0'; yytext += 2; // SKULLDUGGERY: remove backquotes (ok to shorten?)
[dc7db63]	345	IDENTIFIER_RETURN();
	346	}
[51b7345]	347
[b87a5ed]	348	/* numeric constants */
[0a2168f]	349	{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
[59db689]	350	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
[0a2168f]	351	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
[59db689]	352	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[930f69e]	353	{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
	354	{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
[3848e0e]	355	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	356	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b7345]	357
[b87a5ed]	358	/* character constant, allows empty value */
[9ed4f94]	359	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	360	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
[dc7db63]	361	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[930f69e]	362	/* ' stop editor highlighting */
[51b7345]	363
[b87a5ed]	364	/* string constant */
[9ed4f94]	365	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	366	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
[dc7db63]	367	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[930f69e]	368	/* " stop editor highlighting */
[51b7345]	369
[59db689]	370	/* common character/string constant */
[c1c1112]	371	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]	372	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]	373	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]	374
[b87a5ed]	375	/* punctuation */
[615a096]	376	"@" { ASCIIOP_RETURN(); }
[dc7db63]	377	"`" { ASCIIOP_RETURN(); }
[b87a5ed]	378	"[" { ASCIIOP_RETURN(); }
	379	"]" { ASCIIOP_RETURN(); }
	380	"(" { ASCIIOP_RETURN(); }
	381	")" { ASCIIOP_RETURN(); }
	382	"{" { ASCIIOP_RETURN(); }
	383	"}" { ASCIIOP_RETURN(); }
	384	"," { ASCIIOP_RETURN(); } // also operator
	385	":" { ASCIIOP_RETURN(); }
	386	";" { ASCIIOP_RETURN(); }
	387	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	388	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	389
[b87a5ed]	390	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	391	"<:" { RETURN_VAL('['); }
	392	":>" { RETURN_VAL(']'); }
	393	"<%" { RETURN_VAL('{'); }
	394	"%>" { RETURN_VAL('}'); }
[51b7345]	395
[b87a5ed]	396	/* operators */
	397	"!" { ASCIIOP_RETURN(); }
	398	"+" { ASCIIOP_RETURN(); }
	399	"-" { ASCIIOP_RETURN(); }
	400	"*" { ASCIIOP_RETURN(); }
[e5f2a67]	401	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
[b87a5ed]	402	"/" { ASCIIOP_RETURN(); }
	403	"%" { ASCIIOP_RETURN(); }
	404	"^" { ASCIIOP_RETURN(); }
	405	"~" { ASCIIOP_RETURN(); }
	406	"&" { ASCIIOP_RETURN(); }
	407	"\|" { ASCIIOP_RETURN(); }
	408	"<" { ASCIIOP_RETURN(); }
	409	">" { ASCIIOP_RETURN(); }
	410	"=" { ASCIIOP_RETURN(); }
	411	"?" { ASCIIOP_RETURN(); }
[3848e0e]	412
	413	"++" { NAMEDOP_RETURN(ICR); }
	414	"--" { NAMEDOP_RETURN(DECR); }
	415	"==" { NAMEDOP_RETURN(EQ); }
	416	"!=" { NAMEDOP_RETURN(NE); }
	417	"<<" { NAMEDOP_RETURN(LS); }
	418	">>" { NAMEDOP_RETURN(RS); }
	419	"<=" { NAMEDOP_RETURN(LE); }
	420	">=" { NAMEDOP_RETURN(GE); }
	421	"&&" { NAMEDOP_RETURN(ANDAND); }
	422	"\|\|" { NAMEDOP_RETURN(OROR); }
	423	"->" { NAMEDOP_RETURN(ARROW); }
	424	"+=" { NAMEDOP_RETURN(PLUSassign); }
	425	"-=" { NAMEDOP_RETURN(MINUSassign); }
[e5f2a67]	426	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
[3848e0e]	427	"*=" { NAMEDOP_RETURN(MULTassign); }
	428	"/=" { NAMEDOP_RETURN(DIVassign); }
	429	"%=" { NAMEDOP_RETURN(MODassign); }
	430	"&=" { NAMEDOP_RETURN(ANDassign); }
	431	"\|=" { NAMEDOP_RETURN(ORassign); }
	432	"^=" { NAMEDOP_RETURN(ERassign); }
	433	"<<=" { NAMEDOP_RETURN(LSassign); }
	434	">>=" { NAMEDOP_RETURN(RSassign); }
[51b7345]	435
[08061589]	436	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[d69f4bb4]	437	"~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
	438	"-~" { NAMEDOP_RETURN(ErangeDown); } // CFA
	439	"-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA
[097e2b0]	440
[b87a5ed]	441	/* CFA, operator identifier */
	442	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	443	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[76c62b2]	444	"^?{}" { IDENTIFIER_RETURN(); }
[60a8062]	445	"?`"{identifier} { // postfix operator
	446	yylval.tok.str = new string( &yytext[2] ); // remove ?`
	447	yylval.tok.str = build_postfix_name( yylval.tok.str ); // add prefix
	448	RETURN_LOCN( typedefTable.isKind( *yylval.tok.str ) );
	449	}
[b87a5ed]	450	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b7345]	451	/*
[daf9671]	452	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
	453	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
	454	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
	455	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
	456	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
	457	identifier to disambiguate this common case.
	458
	459	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
	460	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
	461	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
	462	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
	463	any meaningful program.
	464
	465	The remaining cases are with the increment/decrement operators and conditional expression:
	466
	467	i++? ...(...);
	468	i?++ ...(...);
	469
	470	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
	471	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
	472	space:
	473
	474	i++ ? i : 0;
	475	i? ++i : 0;
[51b7345]	476	*/
[daf9671]	477	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
[b87a5ed]	478	// 1 or 2 character unary operator ?
	479	int i = yytext[1] == '?' ? 1 : 2;
	480	yyless( i ); // put back characters up to first '?'
	481	if ( i > 1 ) {
	482	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	483	} else {
	484	ASCIIOP_RETURN();
	485	} // if
	486	}
	487
[9ed4f94]	488	/* unknown character */
	489	. { yyerror( "unknown character" ); }
[51b7345]	490
	491	%%
[8551b859]	492
[9ed4f94]	493	// ----end of lexer----
	494
	495	void yyerror( const char * errmsg ) {
[8551b859]	496	SemanticErrorThrow = true;
[a8615fd1]	497	cerr << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
[a16764a6]	498	<< ": " << ErrorHelpers::error_str() << errmsg << " at token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
[9ed4f94]	499	}
[51b7345]	500
[b87a5ed]	501	// Local Variables: //
	502	// mode: c++ //
[de62360d]	503	// tab-width: 4 //
[b87a5ed]	504	// compile-command: "make install" //
	505	// End: //

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