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Last change on this file since 4cc9b13 was d48e529, checked in by Rob Schluntz <rschlunt@…>, 8 years ago
Begin to introduce support for yylloc in the parser and extend CodeLocation to include start column and end column/line number information
Property mode set to `100644`
File size: 17.8 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
[f4b77f2]	12	* Last Modified On : Sun Sep 10 22:29:15 2017
	13	* Update Count : 620
[51b73452]	14	*/
	15
	16	%option yylineno
[4e9c7c1]	17	%option noyywrap
[5f2f2d7]	18	%option nounput
[51b73452]	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.
[51b73452]	24
[8c17ab0]	25	//************************** Includes and Defines **************************
[51b73452]	26
[9ed4f94]	27	unsigned int column = 0; // position of the end of the last token parsed
[d48e529]	28	#define YY_USER_ACTION yylloc.first_line = yylineno; yylloc.first_column = column; column += yyleng; yylloc.last_column = column; yylloc.last_line = yylineno; yylloc.filename = yyfilename ? yyfilename : ""; // trigger before each matching rule's action
[9ed4f94]	29
[51b73452]	30	#include <string>
[f487962]	31	#include <cstdio> // FILENAME_MAX
[9ed4f94]	32	using namespace std;
[51b73452]	33
[984dce6]	34	#include "ParseNode.h"
	35	#include "TypedefTable.h"
[51b73452]	36
	37	char *yyfilename;
[9ed4f94]	38	string *strtext; // accumulate parts of character and string constant value
[51b73452]	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 )
[51b73452]	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';
[51b73452]	73	}
	74
[7812f1d1]	75	// Stop warning due to incorrectly generated flex code.
	76	#pragma GCC diagnostic ignored "-Wsign-compare"
[51b73452]	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}))
[51b73452]	84
[b87a5ed]	85	// identifier, GCC: $ in identifier
[51b73452]	86	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
	87
[b87a5ed]	88	// attribute identifier, GCC: $ in identifier
[51b73452]	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}
[930f69e]	95	length ("ll"\|"LL"\|[lL])\|("hh"\|"HH"\|[hH])
	96	integer_suffix_opt ("_"?(([uU]({length}?[iI]?)\|([iI]{length}))\|([iI]({length}?[uU]?)\|([uU]{length}))\|({length}([iI]?[uU]?)\|([uU][iI]))\|[zZ]))?{user_suffix_opt}
[51b73452]	97
	98	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	99	octal_prefix "0""_"?
[930f69e]	100	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix_opt}
[51b73452]	101
	102	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
[930f69e]	103	decimal_constant {nonzero_digits}{integer_suffix_opt}
[51b73452]	104
	105	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	106	hex_prefix "0"[xX]"_"?
[930f69e]	107	hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
[51b73452]	108
[76c62b2]	109	// GCC: D (double) and iI (imaginary) suffixes, and DL (long double)
[51b73452]	110	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[f4b77f2]	111	floating_suffix ([fFdDlL]?[iI]?)\|([iI][lLfFdD])
	112	floating_suffix_opt ("_"?({floating_suffix}\|"DL"))?{user_suffix_opt}
	113	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
[930f69e]	114	floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
	115	floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
	116	floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})\|({decimal_digits}{floating_fraction})
[51b73452]	117
	118	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
[f4b77f2]	119	hex_floating_suffix_opt ("_"?({floating_suffix}))?{user_suffix_opt}
[930f69e]	120	hex_floating_fraction ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
[f4b77f2]	121	hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})\|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
[51b73452]	122
[b87a5ed]	123	// character escape sequence, GCC: \e => esc character
[51b73452]	124	simple_escape "\\"[abefnrtv'"?\\]
[930f69e]	125	// ' stop editor highlighting
[3848e0e]	126	octal_escape "\\"{octal}("_"?{octal}){0,2}
	127	hex_escape "\\""x""_"?{hex_digits}
[51b73452]	128	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	129	cwide_prefix "L"\|"U"\|"u"
	130	swide_prefix {cwide_prefix}\|"u8"
[51b73452]	131
[b87a5ed]	132	// display/white-space characters
[51b73452]	133	h_tab [\011]
	134	form_feed [\014]
	135	v_tab [\013]
	136	c_return [\015]
	137	h_white [ ]\|{h_tab}
	138
[e7aed49]	139	// overloadable operators
[51b73452]	140	op_unary_only "~"\|"!"
	141	op_unary_binary "+"\|"-"\|"*"
	142	op_unary_pre_post "++"\|"--"
	143	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	144
[994d080]	145	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
[51b73452]	146	op_binary_over {op_unary_binary}\|{op_binary_only}
[e7aed49]	147	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
	148	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
[51b73452]	149
	150	%x COMMENT
[3848e0e]	151	%x BKQUOTE
	152	%x QUOTE
	153	%x STRING
[51b73452]	154
	155	%%
[994d080]	156	/* line directives */
[4040425]	157	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
[930f69e]	158	/* " stop editor highlighting */
[c1c1112]	159	static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b73452]	160	char *end_num;
	161	char begin_string, end_string;
	162	long lineno, length;
	163	lineno = strtol( yytext + 1, &end_num, 0 );
	164	begin_string = strchr( end_num, '"' );
[f487962]	165	if ( begin_string ) { // file name ?
	166	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
	167	assert( end_string ); // closing quote ?
	168	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
	169	assert( length < FILENAME_MAX ); // room for sentinel ?
	170	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
	171	filename[ length ] = '\0'; // terminate string with sentinel
[9ed4f94]	172	//cout << "file " << filename << " line " << lineno << endl;
[f487962]	173	yylineno = lineno;
[c1c1112]	174	yyfilename = filename;
[b87a5ed]	175	} // if
[51b73452]	176	}
	177
[b87a5ed]	178	/* ignore preprocessor directives (for now) */
[51b73452]	179	^{h_white}"#"[^\n]"\n" ;
	180
[cd623a4]	181	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	182	"/*" { BEGIN COMMENT; }
[cd623a4]	183	<COMMENT>.\|\n ;
	184	<COMMENT>"*/" { BEGIN 0; }
[51b73452]	185
[cd623a4]	186	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	187	"//"[^\n]*"\n" ;
[51b73452]	188
[b87a5ed]	189	/* ignore whitespace */
[3848e0e]	190	{h_white}+ { WHITE_RETURN(' '); }
	191	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	192	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b73452]	193
[b87a5ed]	194	/* keywords */
	195	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	196	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	197	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	198	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	199	asm { KEYWORD_RETURN(ASM); }
	200	__asm { KEYWORD_RETURN(ASM); } // GCC
	201	__asm__ { KEYWORD_RETURN(ASM); } // GCC
[02e5ab6]	202	_At { KEYWORD_RETURN(AT); } // CFA
[b87a5ed]	203	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	204	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	205	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	206	auto { KEYWORD_RETURN(AUTO); }
[b87a5ed]	207	_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]	208	break { KEYWORD_RETURN(BREAK); }
	209	case { KEYWORD_RETURN(CASE); }
[b87a5ed]	210	catch { KEYWORD_RETURN(CATCH); } // CFA
[02e5ab6]	211	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
[3848e0e]	212	char { KEYWORD_RETURN(CHAR); }
[b87a5ed]	213	choose { KEYWORD_RETURN(CHOOSE); } // CFA
	214	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
	215	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
	216	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]	217	const { KEYWORD_RETURN(CONST); }
[b87a5ed]	218	__const { KEYWORD_RETURN(CONST); } // GCC
	219	__const__ { KEYWORD_RETURN(CONST); } // GCC
[3848e0e]	220	continue { KEYWORD_RETURN(CONTINUE); }
[e04b636]	221	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
[3848e0e]	222	default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]	223	disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]	224	do { KEYWORD_RETURN(DO); }
[3848e0e]	225	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	226	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	227	else { KEYWORD_RETURN(ELSE); }
[02e5ab6]	228	enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]	229	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	230	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[3848e0e]	231	extern { KEYWORD_RETURN(EXTERN); }
[08061589]	232	fallthrough { KEYWORD_RETURN(FALLTHRU); } // CFA
[b87a5ed]	233	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
	234	finally { KEYWORD_RETURN(FINALLY); } // CFA
[3848e0e]	235	float { KEYWORD_RETURN(FLOAT); }
[b87a5ed]	236	__float128 { KEYWORD_RETURN(FLOAT); } // GCC
	237	for { KEYWORD_RETURN(FOR); }
	238	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	239	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	240	ftype { KEYWORD_RETURN(FTYPE); } // CFA
	241	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	242	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	243	if { KEYWORD_RETURN(IF); }
	244	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	245	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	246	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	247	inline { KEYWORD_RETURN(INLINE); } // C99
	248	__inline { KEYWORD_RETURN(INLINE); } // GCC
	249	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	250	int { KEYWORD_RETURN(INT); }
	251	__int128 { KEYWORD_RETURN(INT); } // GCC
[b15f6cf]	252	__int128_t { KEYWORD_RETURN(INT); } // GCC
[b87a5ed]	253	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	254	long { KEYWORD_RETURN(LONG); }
[6016c87]	255	monitor { KEYWORD_RETURN(MONITOR); } // CFA
[a7c90d4]	256	mutex { KEYWORD_RETURN(MUTEX); } // CFA
[b87a5ed]	257	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]	258	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[3a2128f]	259	one_t { NUMERIC_RETURN(ONE_T); } // CFA
[4040425]	260	otype { KEYWORD_RETURN(OTYPE); } // CFA
[3848e0e]	261	register { KEYWORD_RETURN(REGISTER); }
[b87a5ed]	262	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	263	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	264	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	265	return { KEYWORD_RETURN(RETURN); }
	266	short { KEYWORD_RETURN(SHORT); }
	267	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	268	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	269	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	270	sizeof { KEYWORD_RETURN(SIZEOF); }
	271	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	272	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	273	struct { KEYWORD_RETURN(STRUCT); }
	274	switch { KEYWORD_RETURN(SWITCH); }
[bd4d011]	275	thread { KEYWORD_RETURN(THREAD); } // C11
[b87a5ed]	276	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	277	throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]	278	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[5b2edbc]	279	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
[4040425]	280	trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]	281	try { KEYWORD_RETURN(TRY); } // CFA
[8f60f0b]	282	ttype { KEYWORD_RETURN(TTYPE); } // CFA
[3848e0e]	283	typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]	284	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	285	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	286	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[b15f6cf]	287	__uint128_t { KEYWORD_RETURN(INT); } // GCC
[3848e0e]	288	union { KEYWORD_RETURN(UNION); }
	289	unsigned { KEYWORD_RETURN(UNSIGNED); }
[90c3b1c]	290	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
[72457b6]	291	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
[3848e0e]	292	void { KEYWORD_RETURN(VOID); }
	293	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	294	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	295	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[5b2edbc]	296	waitfor { KEYWORD_RETURN(WAITFOR); }
	297	or { QKEYWORD_RETURN(WOR); } // CFA
	298	when { KEYWORD_RETURN(WHEN); }
[3848e0e]	299	while { KEYWORD_RETURN(WHILE); }
[8b47e50]	300	with { KEYWORD_RETURN(WITH); } // CFA
[3a2128f]	301	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
[51b73452]	302
[b87a5ed]	303	/* identifier */
	304	{identifier} { IDENTIFIER_RETURN(); }
	305	{attr_identifier} { ATTRIBUTE_RETURN(); }
[c6b1105]	306	"`" { BEGIN BKQUOTE; }
[b87a5ed]	307	<BKQUOTE>{identifier} { IDENTIFIER_RETURN(); }
	308	<BKQUOTE>"`" { BEGIN 0; }
[51b73452]	309
[b87a5ed]	310	/* numeric constants */
[59db689]	311	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	312	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	313	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[930f69e]	314	{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
	315	{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
[3848e0e]	316	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	317	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b73452]	318
[b87a5ed]	319	/* character constant, allows empty value */
[9ed4f94]	320	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	321	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
[76c62b2]	322	<QUOTE>['\n]{user_suffix_opt} { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[930f69e]	323	/* ' stop editor highlighting */
[51b73452]	324
[b87a5ed]	325	/* string constant */
[9ed4f94]	326	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	327	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
[76c62b2]	328	<STRING>["\n]{user_suffix_opt} { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[930f69e]	329	/* " stop editor highlighting */
[51b73452]	330
[59db689]	331	/* common character/string constant */
[c1c1112]	332	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]	333	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]	334	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]	335
[b87a5ed]	336	/* punctuation */
[615a096]	337	"@" { ASCIIOP_RETURN(); }
[b87a5ed]	338	"[" { ASCIIOP_RETURN(); }
	339	"]" { ASCIIOP_RETURN(); }
	340	"(" { ASCIIOP_RETURN(); }
	341	")" { ASCIIOP_RETURN(); }
	342	"{" { ASCIIOP_RETURN(); }
	343	"}" { ASCIIOP_RETURN(); }
	344	"," { ASCIIOP_RETURN(); } // also operator
	345	":" { ASCIIOP_RETURN(); }
	346	";" { ASCIIOP_RETURN(); }
	347	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	348	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	349
[b87a5ed]	350	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	351	"<:" { RETURN_VAL('['); }
	352	":>" { RETURN_VAL(']'); }
	353	"<%" { RETURN_VAL('{'); }
	354	"%>" { RETURN_VAL('}'); }
[51b73452]	355
[b87a5ed]	356	/* operators */
	357	"!" { ASCIIOP_RETURN(); }
	358	"+" { ASCIIOP_RETURN(); }
	359	"-" { ASCIIOP_RETURN(); }
	360	"*" { ASCIIOP_RETURN(); }
[e5f2a67]	361	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
[b87a5ed]	362	"/" { ASCIIOP_RETURN(); }
	363	"%" { ASCIIOP_RETURN(); }
	364	"^" { ASCIIOP_RETURN(); }
	365	"~" { ASCIIOP_RETURN(); }
	366	"&" { ASCIIOP_RETURN(); }
	367	"\|" { ASCIIOP_RETURN(); }
	368	"<" { ASCIIOP_RETURN(); }
	369	">" { ASCIIOP_RETURN(); }
	370	"=" { ASCIIOP_RETURN(); }
	371	"?" { ASCIIOP_RETURN(); }
[3848e0e]	372
	373	"++" { NAMEDOP_RETURN(ICR); }
	374	"--" { NAMEDOP_RETURN(DECR); }
	375	"==" { NAMEDOP_RETURN(EQ); }
	376	"!=" { NAMEDOP_RETURN(NE); }
	377	"<<" { NAMEDOP_RETURN(LS); }
	378	">>" { NAMEDOP_RETURN(RS); }
	379	"<=" { NAMEDOP_RETURN(LE); }
	380	">=" { NAMEDOP_RETURN(GE); }
	381	"&&" { NAMEDOP_RETURN(ANDAND); }
	382	"\|\|" { NAMEDOP_RETURN(OROR); }
	383	"->" { NAMEDOP_RETURN(ARROW); }
	384	"+=" { NAMEDOP_RETURN(PLUSassign); }
	385	"-=" { NAMEDOP_RETURN(MINUSassign); }
[e5f2a67]	386	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
[3848e0e]	387	"*=" { NAMEDOP_RETURN(MULTassign); }
	388	"/=" { NAMEDOP_RETURN(DIVassign); }
	389	"%=" { NAMEDOP_RETURN(MODassign); }
	390	"&=" { NAMEDOP_RETURN(ANDassign); }
	391	"\|=" { NAMEDOP_RETURN(ORassign); }
	392	"^=" { NAMEDOP_RETURN(ERassign); }
	393	"<<=" { NAMEDOP_RETURN(LSassign); }
	394	">>=" { NAMEDOP_RETURN(RSassign); }
[51b73452]	395
[08061589]	396	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[097e2b0]	397
[b87a5ed]	398	/* CFA, operator identifier */
	399	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	400	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[76c62b2]	401	"^?{}" { IDENTIFIER_RETURN(); }
	402	"?`"{identifier} { IDENTIFIER_RETURN(); } // unit operator
[b87a5ed]	403	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b73452]	404	/*
[daf9671]	405	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
	406	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
	407	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
	408	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
	409	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
	410	identifier to disambiguate this common case.
	411
	412	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
	413	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
	414	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
	415	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
	416	any meaningful program.
	417
	418	The remaining cases are with the increment/decrement operators and conditional expression:
	419
	420	i++? ...(...);
	421	i?++ ...(...);
	422
	423	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
	424	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
	425	space:
	426
	427	i++ ? i : 0;
	428	i? ++i : 0;
[51b73452]	429	*/
[daf9671]	430	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
[b87a5ed]	431	// 1 or 2 character unary operator ?
	432	int i = yytext[1] == '?' ? 1 : 2;
	433	yyless( i ); // put back characters up to first '?'
	434	if ( i > 1 ) {
	435	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	436	} else {
	437	ASCIIOP_RETURN();
	438	} // if
	439	}
	440
[9ed4f94]	441	/* unknown character */
	442	. { yyerror( "unknown character" ); }
[51b73452]	443
	444	%%
[9ed4f94]	445	// ----end of lexer----
	446
	447	void yyerror( const char * errmsg ) {
	448	cout << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
[ad28abb]	449	<< ": " << SemanticError::error_str() << errmsg << " at token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
[9ed4f94]	450	}
[51b73452]	451
[b87a5ed]	452	// Local Variables: //
	453	// mode: c++ //
[de62360d]	454	// tab-width: 4 //
[b87a5ed]	455	// compile-command: "make install" //
	456	// End: //

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