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lex.ll @ dccc091

ADTarm-ehast-experimentalcleanup-dtorsenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprpthread-emulationqualifiedEnum

Last change on this file since dccc091 was 553772b, checked in by Peter A. Buhr <pabuhr@…>, 5 years ago
add new type constructor "generator" with temporary coroutine semantics
Property mode set to `100644`
File size: 19.1 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
[553772b]	12	* Last Modified On : Wed May 15 21:25:27 2019
	13	* Update Count : 708
[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
	45	char *yyfilename;
[9ed4f94]	46	string *strtext; // accumulate parts of character and string constant value
[51b7345]	47
[de62360d]	48	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
[9ed4f94]	49	#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
[926af74]	50	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
[de62360d]	51	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
[5f2f2d7]	52
[f487962]	53	#define WHITE_RETURN(x) // do nothing
[9ed4f94]	54	#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
[de62360d]	55	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
[f487962]	56	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
[de62360d]	57	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
	58	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
[4439008]	59	#define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword
[984dce6]	60	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
[de62360d]	61	#define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER )
[51b7345]	62
[ba01b14]	63	#ifdef HAVE_KEYWORDS_FLOATXX // GCC >= 7 => keyword, otherwise typedef
	64	#define FLOATXX(v) KEYWORD_RETURN(v);
	65	#else
	66	#define FLOATXX(v) IDENTIFIER_RETURN();
	67	#endif // HAVE_KEYWORDS_FLOATXX
	68
[3848e0e]	69	void rm_underscore() {
[7e419e7]	70	// SKULLDUGGERY: remove underscores (ok to shorten?)
[e7aed49]	71	yyleng = 0;
[7e419e7]	72	for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string
[b87a5ed]	73	if ( yytext[i] != '_' ) {
[e7aed49]	74	yytext[yyleng] = yytext[i];
	75	yyleng += 1;
[b87a5ed]	76	} // if
	77	} // for
	78	yytext[yyleng] = '\0';
[7e419e7]	79	} // rm_underscore
[51b7345]	80
[7812f1d1]	81	// Stop warning due to incorrectly generated flex code.
	82	#pragma GCC diagnostic ignored "-Wsign-compare"
[51b7345]	83	%}
	84
[0a2168f]	85	binary [0-1]
[51b7345]	86	octal [0-7]
	87	nonzero [1-9]
	88	decimal [0-9]
	89	hex [0-9a-fA-F]
[3848e0e]	90	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
[51b7345]	91
[b87a5ed]	92	// identifier, GCC: $ in identifier
[51b7345]	93	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
	94
[b87a5ed]	95	// attribute identifier, GCC: $ in identifier
[51b7345]	96	attr_identifier "@"{identifier}
	97
[b87a5ed]	98	// numeric constants, CFA: '_' in constant
[3848e0e]	99	hex_quad {hex}("_"?{hex}){3}
[201aeb9]	100	size_opt (8\|16\|32\|64\|128)?
[0a616e0]	101	// CFA: explicit l8/l16/l32/l64/l128, char 'hh', short 'h', int 'n'
[f56c32e]	102	length ("ll"\|"LL"\|[lL]{size_opt})\|("hh"\|"HH"\|[hHnN])
[0a616e0]	103	// CFA: size_t 'z', pointer 'p', which define a sign and length
	104	integer_suffix_opt ("_"?(([uU]({length}?[iI]?)\|([iI]{length}))\|([iI]({length}?[uU]?)\|([uU]{length}))\|({length}([iI]?[uU]?)\|([uU][iI]))\|[zZ]\|[pP]))?
[51b7345]	105
	106	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	107	octal_prefix "0""_"?
[930f69e]	108	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix_opt}
[51b7345]	109
	110	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
[930f69e]	111	decimal_constant {nonzero_digits}{integer_suffix_opt}
[51b7345]	112
[0a2168f]	113	binary_digits ({binary})\|({binary}({binary}\|"_")*{binary})
	114	binary_prefix "0"[bB]"_"?
	115	binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt}
	116
[51b7345]	117	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	118	hex_prefix "0"[xX]"_"?
[930f69e]	119	hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
[51b7345]	120
[76c62b2]	121	// GCC: D (double) and iI (imaginary) suffixes, and DL (long double)
[51b7345]	122	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[ba01b14]	123	floating_size 16\|32\|32x\|64\|64x\|80\|128\|128x
	124	floating_length ([fFdDlLwWqQ]\|[fF]{floating_size})
[201aeb9]	125	floating_suffix ({floating_length}?[iI]?)\|([iI]{floating_length})
[dc7db63]	126	floating_suffix_opt ("_"?({floating_suffix}\|"DL"))?
[f4b77f2]	127	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
[930f69e]	128	floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
	129	floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
	130	floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})\|({decimal_digits}{floating_fraction})
[51b7345]	131
	132	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
[dc7db63]	133	hex_floating_suffix_opt ("_"?({floating_suffix}))?
[930f69e]	134	hex_floating_fraction ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
[f4b77f2]	135	hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})\|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
[51b7345]	136
[b87a5ed]	137	// character escape sequence, GCC: \e => esc character
[51b7345]	138	simple_escape "\\"[abefnrtv'"?\\]
[930f69e]	139	// ' stop editor highlighting
[3848e0e]	140	octal_escape "\\"{octal}("_"?{octal}){0,2}
	141	hex_escape "\\""x""_"?{hex_digits}
[51b7345]	142	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	143	cwide_prefix "L"\|"U"\|"u"
	144	swide_prefix {cwide_prefix}\|"u8"
[51b7345]	145
[b87a5ed]	146	// display/white-space characters
[51b7345]	147	h_tab [\011]
	148	form_feed [\014]
	149	v_tab [\013]
	150	c_return [\015]
	151	h_white [ ]\|{h_tab}
	152
[e7aed49]	153	// overloadable operators
[51b7345]	154	op_unary_only "~"\|"!"
	155	op_unary_binary "+"\|"-"\|"*"
	156	op_unary_pre_post "++"\|"--"
	157	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	158
[994d080]	159	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
[51b7345]	160	op_binary_over {op_unary_binary}\|{op_binary_only}
[e7aed49]	161	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
	162	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
[51b7345]	163
	164	%x COMMENT
[3848e0e]	165	%x BKQUOTE
	166	%x QUOTE
	167	%x STRING
[51b7345]	168
	169	%%
[994d080]	170	/* line directives */
[4040425]	171	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
[930f69e]	172	/* " stop editor highlighting */
[c1c1112]	173	static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b7345]	174	char *end_num;
	175	char begin_string, end_string;
	176	long lineno, length;
	177	lineno = strtol( yytext + 1, &end_num, 0 );
	178	begin_string = strchr( end_num, '"' );
[f487962]	179	if ( begin_string ) { // file name ?
	180	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
	181	assert( end_string ); // closing quote ?
	182	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
	183	assert( length < FILENAME_MAX ); // room for sentinel ?
	184	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
	185	filename[ length ] = '\0'; // terminate string with sentinel
[9ed4f94]	186	//cout << "file " << filename << " line " << lineno << endl;
[f487962]	187	yylineno = lineno;
[c1c1112]	188	yyfilename = filename;
[b87a5ed]	189	} // if
[51b7345]	190	}
	191
[637dd9c]	192	/* preprocessor-style directives */
[61fc4f6]	193	^{h_white}"#"[^\n]"\n" { RETURN_VAL( DIRECTIVE ); }
[51b7345]	194
[cd623a4]	195	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	196	"/*" { BEGIN COMMENT; }
[cd623a4]	197	<COMMENT>.\|\n ;
	198	<COMMENT>"*/" { BEGIN 0; }
[51b7345]	199
[cd623a4]	200	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	201	"//"[^\n]*"\n" ;
[51b7345]	202
[b87a5ed]	203	/* ignore whitespace */
[3848e0e]	204	{h_white}+ { WHITE_RETURN(' '); }
	205	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	206	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b7345]	207
[b87a5ed]	208	/* keywords */
	209	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	210	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	211	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	212	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	213	asm { KEYWORD_RETURN(ASM); }
	214	__asm { KEYWORD_RETURN(ASM); } // GCC
	215	__asm__ { KEYWORD_RETURN(ASM); } // GCC
	216	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	217	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	218	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	219	auto { KEYWORD_RETURN(AUTO); }
[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); }
[b87a5ed]	224	catch { KEYWORD_RETURN(CATCH); } // CFA
[02e5ab6]	225	catchResume { KEYWORD_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
[3848e0e]	237	default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]	238	disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]	239	do { KEYWORD_RETURN(DO); }
[3848e0e]	240	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	241	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	242	else { KEYWORD_RETURN(ELSE); }
[02e5ab6]	243	enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]	244	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	245	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[c27fb59]	246	exception { KEYWORD_RETURN(EXCEPTION); } // CFA
[3848e0e]	247	extern { KEYWORD_RETURN(EXTERN); }
[bd7f401]	248	fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
[35f730f]	249	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
[b87a5ed]	250	finally { KEYWORD_RETURN(FINALLY); } // CFA
[3848e0e]	251	float { KEYWORD_RETURN(FLOAT); }
[e15853c]	252	__float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
	253	float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
	254	__float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
	255	float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
	256	_Float16 { FLOATXX(uFLOAT16); } // GCC
	257	_Float32 { FLOATXX(uFLOAT32); } // GCC
	258	_Float32x { FLOATXX(uFLOAT32X); } // GCC
	259	_Float64 { FLOATXX(uFLOAT64); } // GCC
	260	_Float64x { FLOATXX(uFLOAT64X); } // GCC
	261	_Float128 { FLOATXX(uFLOAT128); } // GCC
	262	_Float128x { FLOATXX(uFLOAT128); } // GCC
[b87a5ed]	263	for { KEYWORD_RETURN(FOR); }
	264	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	265	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	266	ftype { KEYWORD_RETURN(FTYPE); } // CFA
[553772b]	267	generator { KEYWORD_RETURN(GENERATOR); } // CFA
[b87a5ed]	268	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	269	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	270	if { KEYWORD_RETURN(IF); }
	271	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	272	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	273	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	274	inline { KEYWORD_RETURN(INLINE); } // C99
	275	__inline { KEYWORD_RETURN(INLINE); } // GCC
	276	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	277	int { KEYWORD_RETURN(INT); }
[201aeb9]	278	__int128 { KEYWORD_RETURN(INT128); } // GCC
	279	int128 { KEYWORD_RETURN(INT128); } // GCC
[b87a5ed]	280	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	281	long { KEYWORD_RETURN(LONG); }
[6016c87]	282	monitor { KEYWORD_RETURN(MONITOR); } // CFA
[a7c90d4]	283	mutex { KEYWORD_RETURN(MUTEX); } // CFA
[b87a5ed]	284	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]	285	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[3a2128f]	286	one_t { NUMERIC_RETURN(ONE_T); } // CFA
[ce28c7b]	287	or { QKEYWORD_RETURN(WOR); } // CFA
[4040425]	288	otype { KEYWORD_RETURN(OTYPE); } // CFA
[3848e0e]	289	register { KEYWORD_RETURN(REGISTER); }
[b87a5ed]	290	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	291	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	292	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	293	return { KEYWORD_RETURN(RETURN); }
	294	short { KEYWORD_RETURN(SHORT); }
	295	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	296	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	297	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	298	sizeof { KEYWORD_RETURN(SIZEOF); }
	299	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	300	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	301	struct { KEYWORD_RETURN(STRUCT); }
	302	switch { KEYWORD_RETURN(SWITCH); }
[bd4d011]	303	thread { KEYWORD_RETURN(THREAD); } // C11
[b87a5ed]	304	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	305	throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]	306	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[5b2edbc]	307	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
[4040425]	308	trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]	309	try { KEYWORD_RETURN(TRY); } // CFA
[8f60f0b]	310	ttype { KEYWORD_RETURN(TTYPE); } // CFA
[3848e0e]	311	typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]	312	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	313	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	314	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[3848e0e]	315	union { KEYWORD_RETURN(UNION); }
	316	unsigned { KEYWORD_RETURN(UNSIGNED); }
[90c3b1c]	317	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
[72457b6]	318	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
[3848e0e]	319	void { KEYWORD_RETURN(VOID); }
	320	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	321	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	322	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[5b2edbc]	323	waitfor { KEYWORD_RETURN(WAITFOR); }
	324	when { KEYWORD_RETURN(WHEN); }
[3848e0e]	325	while { KEYWORD_RETURN(WHILE); }
[8b47e50]	326	with { KEYWORD_RETURN(WITH); } // CFA
[3a2128f]	327	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
[51b7345]	328
[b87a5ed]	329	/* identifier */
	330	{identifier} { IDENTIFIER_RETURN(); }
[7e419e7]	331	"`"{identifier}"`" { // CFA
	332	yytext[yyleng - 1] = '\0'; yytext += 1; // SKULLDUGGERY: remove backquotes (ok to shorten?)
[dc7db63]	333	IDENTIFIER_RETURN();
	334	}
[b87a5ed]	335	{attr_identifier} { ATTRIBUTE_RETURN(); }
[51b7345]	336
[b87a5ed]	337	/* numeric constants */
[0a2168f]	338	{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
[59db689]	339	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
[0a2168f]	340	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
[59db689]	341	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[930f69e]	342	{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
	343	{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
[3848e0e]	344	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	345	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b7345]	346
[b87a5ed]	347	/* character constant, allows empty value */
[9ed4f94]	348	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	349	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
[dc7db63]	350	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[930f69e]	351	/* ' stop editor highlighting */
[51b7345]	352
[b87a5ed]	353	/* string constant */
[9ed4f94]	354	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	355	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
[dc7db63]	356	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[930f69e]	357	/* " stop editor highlighting */
[51b7345]	358
[59db689]	359	/* common character/string constant */
[c1c1112]	360	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]	361	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]	362	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]	363
[b87a5ed]	364	/* punctuation */
[615a096]	365	"@" { ASCIIOP_RETURN(); }
[dc7db63]	366	"`" { ASCIIOP_RETURN(); }
[b87a5ed]	367	"[" { ASCIIOP_RETURN(); }
	368	"]" { ASCIIOP_RETURN(); }
	369	"(" { ASCIIOP_RETURN(); }
	370	")" { ASCIIOP_RETURN(); }
	371	"{" { ASCIIOP_RETURN(); }
	372	"}" { ASCIIOP_RETURN(); }
	373	"," { ASCIIOP_RETURN(); } // also operator
	374	":" { ASCIIOP_RETURN(); }
	375	";" { ASCIIOP_RETURN(); }
	376	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	377	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	378
[b87a5ed]	379	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	380	"<:" { RETURN_VAL('['); }
	381	":>" { RETURN_VAL(']'); }
	382	"<%" { RETURN_VAL('{'); }
	383	"%>" { RETURN_VAL('}'); }
[51b7345]	384
[b87a5ed]	385	/* operators */
	386	"!" { ASCIIOP_RETURN(); }
	387	"+" { ASCIIOP_RETURN(); }
	388	"-" { ASCIIOP_RETURN(); }
	389	"*" { ASCIIOP_RETURN(); }
[e5f2a67]	390	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
[b87a5ed]	391	"/" { ASCIIOP_RETURN(); }
	392	"%" { ASCIIOP_RETURN(); }
	393	"^" { ASCIIOP_RETURN(); }
	394	"~" { ASCIIOP_RETURN(); }
	395	"&" { ASCIIOP_RETURN(); }
	396	"\|" { ASCIIOP_RETURN(); }
	397	"<" { ASCIIOP_RETURN(); }
	398	">" { ASCIIOP_RETURN(); }
	399	"=" { ASCIIOP_RETURN(); }
	400	"?" { ASCIIOP_RETURN(); }
[3848e0e]	401
	402	"++" { NAMEDOP_RETURN(ICR); }
	403	"--" { NAMEDOP_RETURN(DECR); }
	404	"==" { NAMEDOP_RETURN(EQ); }
	405	"!=" { NAMEDOP_RETURN(NE); }
	406	"<<" { NAMEDOP_RETURN(LS); }
	407	">>" { NAMEDOP_RETURN(RS); }
	408	"<=" { NAMEDOP_RETURN(LE); }
	409	">=" { NAMEDOP_RETURN(GE); }
	410	"&&" { NAMEDOP_RETURN(ANDAND); }
	411	"\|\|" { NAMEDOP_RETURN(OROR); }
	412	"->" { NAMEDOP_RETURN(ARROW); }
	413	"+=" { NAMEDOP_RETURN(PLUSassign); }
	414	"-=" { NAMEDOP_RETURN(MINUSassign); }
[e5f2a67]	415	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
[3848e0e]	416	"*=" { NAMEDOP_RETURN(MULTassign); }
	417	"/=" { NAMEDOP_RETURN(DIVassign); }
	418	"%=" { NAMEDOP_RETURN(MODassign); }
	419	"&=" { NAMEDOP_RETURN(ANDassign); }
	420	"\|=" { NAMEDOP_RETURN(ORassign); }
	421	"^=" { NAMEDOP_RETURN(ERassign); }
	422	"<<=" { NAMEDOP_RETURN(LSassign); }
	423	">>=" { NAMEDOP_RETURN(RSassign); }
[51b7345]	424
[08061589]	425	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[d69f4bb4]	426	"~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
	427	"-~" { NAMEDOP_RETURN(ErangeDown); } // CFA
	428	"-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA
[097e2b0]	429
[b87a5ed]	430	/* CFA, operator identifier */
	431	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	432	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[76c62b2]	433	"^?{}" { IDENTIFIER_RETURN(); }
[7e419e7]	434	"?`"{identifier} { IDENTIFIER_RETURN(); } // postfix operator
[b87a5ed]	435	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b7345]	436	/*
[daf9671]	437	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
	438	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
	439	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
	440	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
	441	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
	442	identifier to disambiguate this common case.
	443
	444	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
	445	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
	446	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
	447	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
	448	any meaningful program.
	449
	450	The remaining cases are with the increment/decrement operators and conditional expression:
	451
	452	i++? ...(...);
	453	i?++ ...(...);
	454
	455	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
	456	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
	457	space:
	458
	459	i++ ? i : 0;
	460	i? ++i : 0;
[51b7345]	461	*/
[daf9671]	462	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
[b87a5ed]	463	// 1 or 2 character unary operator ?
	464	int i = yytext[1] == '?' ? 1 : 2;
	465	yyless( i ); // put back characters up to first '?'
	466	if ( i > 1 ) {
	467	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	468	} else {
	469	ASCIIOP_RETURN();
	470	} // if
	471	}
	472
[9ed4f94]	473	/* unknown character */
	474	. { yyerror( "unknown character" ); }
[51b7345]	475
	476	%%
[8551b859]	477
[9ed4f94]	478	// ----end of lexer----
	479
	480	void yyerror( const char * errmsg ) {
[8551b859]	481	SemanticErrorThrow = true;
[a8615fd1]	482	cerr << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
[a16764a6]	483	<< ": " << ErrorHelpers::error_str() << errmsg << " at token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
[9ed4f94]	484	}
[51b7345]	485
[b87a5ed]	486	// Local Variables: //
	487	// mode: c++ //
[de62360d]	488	// tab-width: 4 //
[b87a5ed]	489	// compile-command: "make install" //
	490	// End: //

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