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lex.ll@ 3eab0ef6

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ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc

Last change on this file since 3eab0ef6 was 5b2edbc, checked in by Peter A. Buhr <pabuhr@…>, 8 years ago
add waitfor statement
Property mode set to `100644`
File size: 16.8 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
[5b2edbc]	12	* Last Modified On : Tue Aug 22 22:43:39 2017
	13	* Update Count : 558
[51b73452]	14	*/
	15
	16	%option yylineno
[4e9c7c1]	17	%option noyywrap
[5f2f2d7]	18	%option nounput
[51b73452]	19
	20	%{
[de62360d]	21	// This lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive have been
	22	// performed and removed from the source. The only exceptions are preprocessor directives passed to the compiler (e.g.,
	23	// line-number directives) and C/C++ style comments, which are ignored.
[51b73452]	24
[8c17ab0]	25	//************************** Includes and Defines **************************
[51b73452]	26
	27	#include <string>
[f487962]	28	#include <cstdio> // FILENAME_MAX
[51b73452]	29
[984dce6]	30	#include "ParseNode.h"
	31	#include "TypedefTable.h"
[51b73452]	32
	33	char *yyfilename;
[b87a5ed]	34	std::string *strtext; // accumulate parts of character and string constant value
[51b73452]	35
[de62360d]	36	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
	37	#define RETURN_VAL(x) yylval.tok.str = new std::string( yytext ); RETURN_LOCN( x )
[926af74]	38	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
[de62360d]	39	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
[5f2f2d7]	40
[f487962]	41	#define WHITE_RETURN(x) // do nothing
[de62360d]	42	#define NEWLINE_RETURN() WHITE_RETURN( '\n' )
	43	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
[f487962]	44	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
[de62360d]	45	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
	46	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
[5b2edbc]	47	#define QKEYWORD_RETURN(x) typedefTable.isKind( yytext ); RETURN_VAL(x); // quasi-keyword
[984dce6]	48	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
[de62360d]	49	#define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER )
[51b73452]	50
[3848e0e]	51	void rm_underscore() {
[e7aed49]	52	// Remove underscores in numeric constant by copying the non-underscore characters to the front of the string.
	53	yyleng = 0;
[b87a5ed]	54	for ( int i = 0; yytext[i] != '\0'; i += 1 ) {
	55	if ( yytext[i] != '_' ) {
[e7aed49]	56	yytext[yyleng] = yytext[i];
	57	yyleng += 1;
[b87a5ed]	58	} // if
	59	} // for
	60	yytext[yyleng] = '\0';
[51b73452]	61	}
	62
[7812f1d1]	63	// Stop warning due to incorrectly generated flex code.
	64	#pragma GCC diagnostic ignored "-Wsign-compare"
[51b73452]	65	%}
	66
	67	octal [0-7]
	68	nonzero [1-9]
	69	decimal [0-9]
	70	hex [0-9a-fA-F]
[3848e0e]	71	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
[51b73452]	72
[b87a5ed]	73	// identifier, GCC: $ in identifier
[51b73452]	74	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
	75
[b87a5ed]	76	// attribute identifier, GCC: $ in identifier
[51b73452]	77	attr_identifier "@"{identifier}
	78
[b87a5ed]	79	// numeric constants, CFA: '_' in constant
[3848e0e]	80	hex_quad {hex}("_"?{hex}){3}
[ba2356b]	81	integer_suffix "_"?(([uU](("ll"\|"LL"\|[lL])[iI]\|[iI]?("ll"\|"LL"\|[lL])?))\|([iI](("ll"\|"LL"\|[lL])[uU]\|[uU]?("ll"\|"LL"\|[lL])?))\|(("ll"\|"LL"\|[lL])([iI][uU]\|[uU]?[iI]?)))
[51b73452]	82
	83	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	84	octal_prefix "0""_"?
	85	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix}?
	86
	87	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
	88	decimal_constant {nonzero_digits}{integer_suffix}?
	89
	90	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	91	hex_prefix "0"[xX]"_"?
	92	hex_constant {hex_prefix}{hex_digits}{integer_suffix}?
	93
	94	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
[0213af6]	95	real_decimal {decimal_digits}"."{exponent}?{floating_suffix}?
	96	real_fraction "."{decimal_digits}{exponent}?{floating_suffix}?
	97	real_constant {decimal_digits}{real_fraction}
[51b73452]	98	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[ba2356b]	99	// GCC: D (double) and iI (imaginary) suffixes, and DL (long double)
	100	floating_suffix "_"?([fFdDlL][iI]?\|[iI][lLfFdD]?\|"DL")
[1b29996]	101	floating_constant (({real_constant}{exponent}?)\|({decimal_digits}{exponent})){floating_suffix}?
[51b73452]	102
	103	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
	104	hex_fractional_constant ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
	105	hex_floating_constant {hex_prefix}(({hex_fractional_constant}{binary_exponent})\|({hex_digits}{binary_exponent})){floating_suffix}?
	106
[b87a5ed]	107	// character escape sequence, GCC: \e => esc character
[51b73452]	108	simple_escape "\\"[abefnrtv'"?\\]
[b87a5ed]	109	// ' stop highlighting
[3848e0e]	110	octal_escape "\\"{octal}("_"?{octal}){0,2}
	111	hex_escape "\\""x""_"?{hex_digits}
[51b73452]	112	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	113	cwide_prefix "L"\|"U"\|"u"
	114	swide_prefix {cwide_prefix}\|"u8"
[51b73452]	115
[b87a5ed]	116	// display/white-space characters
[51b73452]	117	h_tab [\011]
	118	form_feed [\014]
	119	v_tab [\013]
	120	c_return [\015]
	121	h_white [ ]\|{h_tab}
	122
[e7aed49]	123	// overloadable operators
[51b73452]	124	op_unary_only "~"\|"!"
	125	op_unary_binary "+"\|"-"\|"*"
	126	op_unary_pre_post "++"\|"--"
	127	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	128
[994d080]	129	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
[51b73452]	130	op_binary_over {op_unary_binary}\|{op_binary_only}
[e7aed49]	131	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
	132	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
[51b73452]	133
	134	%x COMMENT
[3848e0e]	135	%x BKQUOTE
	136	%x QUOTE
	137	%x STRING
[51b73452]	138
	139	%%
[994d080]	140	/* line directives */
[4040425]	141	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
[8c17ab0]	142	/* " stop highlighting */
[c1c1112]	143	static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b73452]	144	char *end_num;
	145	char begin_string, end_string;
	146	long lineno, length;
	147	lineno = strtol( yytext + 1, &end_num, 0 );
	148	begin_string = strchr( end_num, '"' );
[f487962]	149	if ( begin_string ) { // file name ?
	150	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
	151	assert( end_string ); // closing quote ?
	152	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
	153	assert( length < FILENAME_MAX ); // room for sentinel ?
	154	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
	155	filename[ length ] = '\0'; // terminate string with sentinel
	156	//std::cout << "file " << filename << " line " << lineno << std::endl;
	157	yylineno = lineno;
[c1c1112]	158	yyfilename = filename;
[b87a5ed]	159	} // if
[51b73452]	160	}
	161
[b87a5ed]	162	/* ignore preprocessor directives (for now) */
[51b73452]	163	^{h_white}"#"[^\n]"\n" ;
	164
[cd623a4]	165	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	166	"/*" { BEGIN COMMENT; }
[cd623a4]	167	<COMMENT>.\|\n ;
	168	<COMMENT>"*/" { BEGIN 0; }
[51b73452]	169
[cd623a4]	170	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	171	"//"[^\n]*"\n" ;
[51b73452]	172
[b87a5ed]	173	/* ignore whitespace */
[3848e0e]	174	{h_white}+ { WHITE_RETURN(' '); }
	175	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	176	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b73452]	177
[b87a5ed]	178	/* keywords */
	179	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	180	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	181	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	182	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	183	asm { KEYWORD_RETURN(ASM); }
	184	__asm { KEYWORD_RETURN(ASM); } // GCC
	185	__asm__ { KEYWORD_RETURN(ASM); } // GCC
[02e5ab6]	186	_At { KEYWORD_RETURN(AT); } // CFA
[b87a5ed]	187	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	188	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	189	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	190	auto { KEYWORD_RETURN(AUTO); }
[b87a5ed]	191	_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]	192	break { KEYWORD_RETURN(BREAK); }
	193	case { KEYWORD_RETURN(CASE); }
[b87a5ed]	194	catch { KEYWORD_RETURN(CATCH); } // CFA
[02e5ab6]	195	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
[3848e0e]	196	char { KEYWORD_RETURN(CHAR); }
[b87a5ed]	197	choose { KEYWORD_RETURN(CHOOSE); } // CFA
	198	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
	199	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
	200	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]	201	const { KEYWORD_RETURN(CONST); }
[b87a5ed]	202	__const { KEYWORD_RETURN(CONST); } // GCC
	203	__const__ { KEYWORD_RETURN(CONST); } // GCC
[3848e0e]	204	continue { KEYWORD_RETURN(CONTINUE); }
[e04b636]	205	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
[3848e0e]	206	default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]	207	disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]	208	do { KEYWORD_RETURN(DO); }
[3848e0e]	209	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	210	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	211	else { KEYWORD_RETURN(ELSE); }
[02e5ab6]	212	enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]	213	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	214	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[3848e0e]	215	extern { KEYWORD_RETURN(EXTERN); }
[08061589]	216	fallthrough { KEYWORD_RETURN(FALLTHRU); } // CFA
[b87a5ed]	217	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
	218	finally { KEYWORD_RETURN(FINALLY); } // CFA
[3848e0e]	219	float { KEYWORD_RETURN(FLOAT); }
[b87a5ed]	220	__float128 { KEYWORD_RETURN(FLOAT); } // GCC
	221	for { KEYWORD_RETURN(FOR); }
	222	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	223	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	224	ftype { KEYWORD_RETURN(FTYPE); } // CFA
	225	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	226	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	227	if { KEYWORD_RETURN(IF); }
	228	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	229	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	230	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	231	inline { KEYWORD_RETURN(INLINE); } // C99
	232	__inline { KEYWORD_RETURN(INLINE); } // GCC
	233	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	234	int { KEYWORD_RETURN(INT); }
	235	__int128 { KEYWORD_RETURN(INT); } // GCC
[b15f6cf]	236	__int128_t { KEYWORD_RETURN(INT); } // GCC
[b87a5ed]	237	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	238	long { KEYWORD_RETURN(LONG); }
[b87a5ed]	239	lvalue { KEYWORD_RETURN(LVALUE); } // CFA
[6016c87]	240	monitor { KEYWORD_RETURN(MONITOR); } // CFA
[a7c90d4]	241	mutex { KEYWORD_RETURN(MUTEX); } // CFA
[b87a5ed]	242	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]	243	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[3a2128f]	244	one_t { NUMERIC_RETURN(ONE_T); } // CFA
[4040425]	245	otype { KEYWORD_RETURN(OTYPE); } // CFA
[3848e0e]	246	register { KEYWORD_RETURN(REGISTER); }
[b87a5ed]	247	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	248	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	249	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	250	return { KEYWORD_RETURN(RETURN); }
	251	short { KEYWORD_RETURN(SHORT); }
	252	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	253	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	254	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	255	sizeof { KEYWORD_RETURN(SIZEOF); }
	256	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	257	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	258	struct { KEYWORD_RETURN(STRUCT); }
	259	switch { KEYWORD_RETURN(SWITCH); }
[bd4d011]	260	thread { KEYWORD_RETURN(THREAD); } // C11
[b87a5ed]	261	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	262	throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]	263	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[5b2edbc]	264	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
[4040425]	265	trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]	266	try { KEYWORD_RETURN(TRY); } // CFA
[8f60f0b]	267	ttype { KEYWORD_RETURN(TTYPE); } // CFA
[3848e0e]	268	typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]	269	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	270	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	271	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[b15f6cf]	272	__uint128_t { KEYWORD_RETURN(INT); } // GCC
[3848e0e]	273	union { KEYWORD_RETURN(UNION); }
	274	unsigned { KEYWORD_RETURN(UNSIGNED); }
[90c3b1c]	275	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
[72457b6]	276	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
[3848e0e]	277	void { KEYWORD_RETURN(VOID); }
	278	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	279	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	280	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[5b2edbc]	281	waitfor { KEYWORD_RETURN(WAITFOR); }
	282	or { QKEYWORD_RETURN(WOR); } // CFA
	283	when { KEYWORD_RETURN(WHEN); }
[3848e0e]	284	while { KEYWORD_RETURN(WHILE); }
[8b47e50]	285	with { KEYWORD_RETURN(WITH); } // CFA
[3a2128f]	286	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
[51b73452]	287
[b87a5ed]	288	/* identifier */
	289	{identifier} { IDENTIFIER_RETURN(); }
	290	{attr_identifier} { ATTRIBUTE_RETURN(); }
[c6b1105]	291	"`" { BEGIN BKQUOTE; }
[b87a5ed]	292	<BKQUOTE>{identifier} { IDENTIFIER_RETURN(); }
	293	<BKQUOTE>"`" { BEGIN 0; }
[51b73452]	294
[b87a5ed]	295	/* numeric constants */
[59db689]	296	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	297	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	298	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[1b29996]	299	{real_decimal} { NUMERIC_RETURN(REALDECIMALconstant); } // must appear before floating_constant
	300	{real_fraction} { NUMERIC_RETURN(REALFRACTIONconstant); } // must appear before floating_constant
[3848e0e]	301	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	302	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b73452]	303
[b87a5ed]	304	/* character constant, allows empty value */
[c1c1112]	305	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new std::string( yytext, yyleng ); }
	306	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
	307	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[b87a5ed]	308	/* ' stop highlighting */
[51b73452]	309
[b87a5ed]	310	/* string constant */
[c1c1112]	311	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new std::string( yytext, yyleng ); }
	312	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
	313	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[b87a5ed]	314	/* " stop highlighting */
[51b73452]	315
[59db689]	316	/* common character/string constant */
[c1c1112]	317	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]	318	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]	319	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]	320
[b87a5ed]	321	/* punctuation */
[615a096]	322	"@" { ASCIIOP_RETURN(); }
[b87a5ed]	323	"[" { ASCIIOP_RETURN(); }
	324	"]" { ASCIIOP_RETURN(); }
	325	"(" { ASCIIOP_RETURN(); }
	326	")" { ASCIIOP_RETURN(); }
	327	"{" { ASCIIOP_RETURN(); }
	328	"}" { ASCIIOP_RETURN(); }
	329	"," { ASCIIOP_RETURN(); } // also operator
	330	":" { ASCIIOP_RETURN(); }
	331	";" { ASCIIOP_RETURN(); }
	332	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	333	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	334
[b87a5ed]	335	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	336	"<:" { RETURN_VAL('['); }
	337	":>" { RETURN_VAL(']'); }
	338	"<%" { RETURN_VAL('{'); }
	339	"%>" { RETURN_VAL('}'); }
[51b73452]	340
[b87a5ed]	341	/* operators */
	342	"!" { ASCIIOP_RETURN(); }
	343	"+" { ASCIIOP_RETURN(); }
	344	"-" { ASCIIOP_RETURN(); }
	345	"*" { ASCIIOP_RETURN(); }
[e5f2a67]	346	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
[b87a5ed]	347	"/" { ASCIIOP_RETURN(); }
	348	"%" { ASCIIOP_RETURN(); }
	349	"^" { ASCIIOP_RETURN(); }
	350	"~" { ASCIIOP_RETURN(); }
	351	"&" { ASCIIOP_RETURN(); }
	352	"\|" { ASCIIOP_RETURN(); }
	353	"<" { ASCIIOP_RETURN(); }
	354	">" { ASCIIOP_RETURN(); }
	355	"=" { ASCIIOP_RETURN(); }
	356	"?" { ASCIIOP_RETURN(); }
[3848e0e]	357
	358	"++" { NAMEDOP_RETURN(ICR); }
	359	"--" { NAMEDOP_RETURN(DECR); }
	360	"==" { NAMEDOP_RETURN(EQ); }
	361	"!=" { NAMEDOP_RETURN(NE); }
	362	"<<" { NAMEDOP_RETURN(LS); }
	363	">>" { NAMEDOP_RETURN(RS); }
	364	"<=" { NAMEDOP_RETURN(LE); }
	365	">=" { NAMEDOP_RETURN(GE); }
	366	"&&" { NAMEDOP_RETURN(ANDAND); }
	367	"\|\|" { NAMEDOP_RETURN(OROR); }
	368	"->" { NAMEDOP_RETURN(ARROW); }
	369	"+=" { NAMEDOP_RETURN(PLUSassign); }
	370	"-=" { NAMEDOP_RETURN(MINUSassign); }
[e5f2a67]	371	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
[3848e0e]	372	"*=" { NAMEDOP_RETURN(MULTassign); }
	373	"/=" { NAMEDOP_RETURN(DIVassign); }
	374	"%=" { NAMEDOP_RETURN(MODassign); }
	375	"&=" { NAMEDOP_RETURN(ANDassign); }
	376	"\|=" { NAMEDOP_RETURN(ORassign); }
	377	"^=" { NAMEDOP_RETURN(ERassign); }
	378	"<<=" { NAMEDOP_RETURN(LSassign); }
	379	">>=" { NAMEDOP_RETURN(RSassign); }
[51b73452]	380
[08061589]	381	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[097e2b0]	382
[b87a5ed]	383	/* CFA, operator identifier */
	384	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	385	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[02e5ab6]	386	"^?{}" { IDENTIFIER_RETURN(); }
[b87a5ed]	387	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b73452]	388	/*
[daf9671]	389	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
	390	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
	391	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
	392	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
	393	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
	394	identifier to disambiguate this common case.
	395
	396	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
	397	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
	398	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
	399	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
	400	any meaningful program.
	401
	402	The remaining cases are with the increment/decrement operators and conditional expression:
	403
	404	i++? ...(...);
	405	i?++ ...(...);
	406
	407	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
	408	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
	409	space:
	410
	411	i++ ? i : 0;
	412	i? ++i : 0;
[51b73452]	413	*/
[daf9671]	414	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
[b87a5ed]	415	// 1 or 2 character unary operator ?
	416	int i = yytext[1] == '?' ? 1 : 2;
	417	yyless( i ); // put back characters up to first '?'
	418	if ( i > 1 ) {
	419	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	420	} else {
	421	ASCIIOP_RETURN();
	422	} // if
	423	}
	424
	425	/* unknown characters */
[a2e0687]	426	. { printf("unknown character(s):\"%s\" on line %d\n", yytext, yylineno); }
[51b73452]	427
	428	%%
	429
[b87a5ed]	430	// Local Variables: //
	431	// mode: c++ //
[de62360d]	432	// tab-width: 4 //
[b87a5ed]	433	// compile-command: "make install" //
	434	// End: //

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