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Last change on this file since efe4d730 was 9059213, checked in by Peter A. Buhr <pabuhr@…>, 9 years ago
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File size: 15.6 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.
[51b73452]	6	*
	7	* lex.l --
	8	*
	9	* Author : Peter A. Buhr
	10	* Created On : Sat Sep 22 08:58:10 2001
[926af74]	11	* Last Modified By : Peter A. Buhr
[9059213]	12	* Last Modified On : Tue Oct 18 22:19:37 2016
	13	* Update Count : 488
[51b73452]	14	*/
	15
	16	%option yylineno
[5f2f2d7]	17	%option nounput
[51b73452]	18
	19	%{
[de62360d]	20	// This lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive have been
	21	// performed and removed from the source. The only exceptions are preprocessor directives passed to the compiler (e.g.,
	22	// line-number directives) and C/C++ style comments, which are ignored.
[51b73452]	23
[8c17ab0]	24	//************************** Includes and Defines **************************
[51b73452]	25
	26	#include <string>
[f487962]	27	#include <cstdio> // FILENAME_MAX
[51b73452]	28
	29	#include "lex.h"
[59db689]	30	#include "parser.h" // YACC generated definitions based on C++ grammar
[984dce6]	31	#include "ParseNode.h"
	32	#include "TypedefTable.h"
[51b73452]	33
	34	char *yyfilename;
[b87a5ed]	35	std::string *strtext; // accumulate parts of character and string constant value
[51b73452]	36
[de62360d]	37	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
	38	#define RETURN_VAL(x) yylval.tok.str = new std::string( yytext ); RETURN_LOCN( x )
[926af74]	39	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
[de62360d]	40	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
[5f2f2d7]	41
[f487962]	42	#define WHITE_RETURN(x) // do nothing
[de62360d]	43	#define NEWLINE_RETURN() WHITE_RETURN( '\n' )
	44	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
[f487962]	45	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
[de62360d]	46	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
	47	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // 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
	63	%}
	64
	65	octal [0-7]
	66	nonzero [1-9]
	67	decimal [0-9]
	68	hex [0-9a-fA-F]
[3848e0e]	69	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
[51b73452]	70
[b87a5ed]	71	// identifier, GCC: $ in identifier
[51b73452]	72	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
	73
[b87a5ed]	74	// attribute identifier, GCC: $ in identifier
[51b73452]	75	attr_identifier "@"{identifier}
	76
[b87a5ed]	77	// numeric constants, CFA: '_' in constant
[3848e0e]	78	hex_quad {hex}("_"?{hex}){3}
[51b73452]	79	integer_suffix "_"?(([uU][lL]?)\|([uU]("ll"\|"LL")?)\|([lL][uU]?)\|("ll"\|"LL")[uU]?)
	80
	81	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	82	octal_prefix "0""_"?
	83	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix}?
	84
	85	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
	86	decimal_constant {nonzero_digits}{integer_suffix}?
	87
	88	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	89	hex_prefix "0"[xX]"_"?
	90	hex_constant {hex_prefix}{hex_digits}{integer_suffix}?
	91
	92	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
	93	fractional_constant ({decimal_digits}?"."{decimal_digits})\|({decimal_digits}".")
	94	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[984dce6]	95	// GCC: D (double), DL (long double) and iI (imaginary) suffixes
	96	floating_suffix "_"?([fFdDlL][iI]?\|"DL"\|[iI][lLfFdD]?)
	97	//floating_suffix "_"?([fFdD]\|[lL]\|[D][L])\|([iI][lLfFdD])\|([lLfFdD][iI]))
[51b73452]	98	floating_constant (({fractional_constant}{exponent}?)\|({decimal_digits}{exponent})){floating_suffix}?
	99
	100	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
	101	hex_fractional_constant ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
	102	hex_floating_constant {hex_prefix}(({hex_fractional_constant}{binary_exponent})\|({hex_digits}{binary_exponent})){floating_suffix}?
	103
[b87a5ed]	104	// character escape sequence, GCC: \e => esc character
[51b73452]	105	simple_escape "\\"[abefnrtv'"?\\]
[b87a5ed]	106	// ' stop highlighting
[3848e0e]	107	octal_escape "\\"{octal}("_"?{octal}){0,2}
	108	hex_escape "\\""x""_"?{hex_digits}
[51b73452]	109	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	110	cwide_prefix "L"\|"U"\|"u"
	111	swide_prefix {cwide_prefix}\|"u8"
[51b73452]	112
[b87a5ed]	113	// display/white-space characters
[51b73452]	114	h_tab [\011]
	115	form_feed [\014]
	116	v_tab [\013]
	117	c_return [\015]
	118	h_white [ ]\|{h_tab}
	119
[e7aed49]	120	// overloadable operators
[51b73452]	121	op_unary_only "~"\|"!"
	122	op_unary_binary "+"\|"-"\|"*"
	123	op_unary_pre_post "++"\|"--"
	124	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	125
	126	op_binary_only "/"\|"%"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"&="\|"\|="\|"^="\|"<<="\|">>="
	127	op_binary_over {op_unary_binary}\|{op_binary_only}
[e7aed49]	128	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
	129	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
[51b73452]	130
	131	%x COMMENT
[3848e0e]	132	%x BKQUOTE
	133	%x QUOTE
	134	%x STRING
[51b73452]	135
	136	%%
[b87a5ed]	137	/* line directives */
[4040425]	138	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
[8c17ab0]	139	/* " stop highlighting */
[c1c1112]	140	static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b73452]	141	char *end_num;
	142	char begin_string, end_string;
	143	long lineno, length;
	144	lineno = strtol( yytext + 1, &end_num, 0 );
	145	begin_string = strchr( end_num, '"' );
[f487962]	146	if ( begin_string ) { // file name ?
	147	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
	148	assert( end_string ); // closing quote ?
	149	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
	150	assert( length < FILENAME_MAX ); // room for sentinel ?
	151	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
	152	filename[ length ] = '\0'; // terminate string with sentinel
	153	//std::cout << "file " << filename << " line " << lineno << std::endl;
	154	yylineno = lineno;
[c1c1112]	155	yyfilename = filename;
[b87a5ed]	156	} // if
[51b73452]	157	}
	158
[b87a5ed]	159	/* ignore preprocessor directives (for now) */
[51b73452]	160	^{h_white}"#"[^\n]"\n" ;
	161
[cd623a4]	162	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	163	"/*" { BEGIN COMMENT; }
[cd623a4]	164	<COMMENT>.\|\n ;
	165	<COMMENT>"*/" { BEGIN 0; }
[51b73452]	166
[cd623a4]	167	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	168	"//"[^\n]*"\n" ;
[51b73452]	169
[b87a5ed]	170	/* ignore whitespace */
[3848e0e]	171	{h_white}+ { WHITE_RETURN(' '); }
	172	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	173	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b73452]	174
[b87a5ed]	175	/* keywords */
	176	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	177	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	178	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	179	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	180	asm { KEYWORD_RETURN(ASM); }
	181	__asm { KEYWORD_RETURN(ASM); } // GCC
	182	__asm__ { KEYWORD_RETURN(ASM); } // GCC
[02e5ab6]	183	_At { KEYWORD_RETURN(AT); } // CFA
[b87a5ed]	184	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	185	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	186	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	187	auto { KEYWORD_RETURN(AUTO); }
[b87a5ed]	188	_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]	189	break { KEYWORD_RETURN(BREAK); }
	190	case { KEYWORD_RETURN(CASE); }
[b87a5ed]	191	catch { KEYWORD_RETURN(CATCH); } // CFA
[02e5ab6]	192	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
[3848e0e]	193	char { KEYWORD_RETURN(CHAR); }
[b87a5ed]	194	choose { KEYWORD_RETURN(CHOOSE); } // CFA
	195	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
	196	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
	197	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]	198	const { KEYWORD_RETURN(CONST); }
[b87a5ed]	199	__const { KEYWORD_RETURN(CONST); } // GCC
	200	__const__ { KEYWORD_RETURN(CONST); } // GCC
[3848e0e]	201	continue { KEYWORD_RETURN(CONTINUE); }
	202	default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]	203	disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]	204	do { KEYWORD_RETURN(DO); }
[3848e0e]	205	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	206	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	207	else { KEYWORD_RETURN(ELSE); }
[02e5ab6]	208	enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]	209	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	210	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[3848e0e]	211	extern { KEYWORD_RETURN(EXTERN); }
[08061589]	212	fallthrough { KEYWORD_RETURN(FALLTHRU); } // CFA
[b87a5ed]	213	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
	214	finally { KEYWORD_RETURN(FINALLY); } // CFA
[3848e0e]	215	float { KEYWORD_RETURN(FLOAT); }
[b87a5ed]	216	__float128 { KEYWORD_RETURN(FLOAT); } // GCC
	217	for { KEYWORD_RETURN(FOR); }
	218	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	219	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	220	ftype { KEYWORD_RETURN(FTYPE); } // CFA
	221	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	222	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	223	if { KEYWORD_RETURN(IF); }
	224	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	225	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	226	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	227	inline { KEYWORD_RETURN(INLINE); } // C99
	228	__inline { KEYWORD_RETURN(INLINE); } // GCC
	229	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	230	int { KEYWORD_RETURN(INT); }
	231	__int128 { KEYWORD_RETURN(INT); } // GCC
	232	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	233	long { KEYWORD_RETURN(LONG); }
[b87a5ed]	234	lvalue { KEYWORD_RETURN(LVALUE); } // CFA
	235	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]	236	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[4040425]	237	otype { KEYWORD_RETURN(OTYPE); } // CFA
[3848e0e]	238	register { KEYWORD_RETURN(REGISTER); }
[b87a5ed]	239	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	240	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	241	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	242	return { KEYWORD_RETURN(RETURN); }
	243	short { KEYWORD_RETURN(SHORT); }
	244	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	245	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	246	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	247	sizeof { KEYWORD_RETURN(SIZEOF); }
	248	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	249	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	250	struct { KEYWORD_RETURN(STRUCT); }
	251	switch { KEYWORD_RETURN(SWITCH); }
[b87a5ed]	252	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	253	throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]	254	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[4040425]	255	trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]	256	try { KEYWORD_RETURN(TRY); } // CFA
[3848e0e]	257	typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]	258	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	259	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	260	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[3848e0e]	261	union { KEYWORD_RETURN(UNION); }
	262	unsigned { KEYWORD_RETURN(UNSIGNED); }
[90c3b1c]	263	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
[3848e0e]	264	void { KEYWORD_RETURN(VOID); }
	265	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	266	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	267	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[3848e0e]	268	while { KEYWORD_RETURN(WHILE); }
[51b73452]	269
[b87a5ed]	270	/* identifier */
	271	{identifier} { IDENTIFIER_RETURN(); }
	272	{attr_identifier} { ATTRIBUTE_RETURN(); }
[c6b1105]	273	"`" { BEGIN BKQUOTE; }
[b87a5ed]	274	<BKQUOTE>{identifier} { IDENTIFIER_RETURN(); }
	275	<BKQUOTE>"`" { BEGIN 0; }
[51b73452]	276
[b87a5ed]	277	/* numeric constants */
	278	"0" { NUMERIC_RETURN(ZERO); } // CFA
	279	"1" { NUMERIC_RETURN(ONE); } // CFA
[59db689]	280	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	281	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	282	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[3848e0e]	283	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	284	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b73452]	285
[b87a5ed]	286	/* character constant, allows empty value */
[c1c1112]	287	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new std::string( yytext, yyleng ); }
	288	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
	289	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[b87a5ed]	290	/* ' stop highlighting */
[51b73452]	291
[b87a5ed]	292	/* string constant */
[c1c1112]	293	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new std::string( yytext, yyleng ); }
	294	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
	295	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[b87a5ed]	296	/* " stop highlighting */
[51b73452]	297
[59db689]	298	/* common character/string constant */
[c1c1112]	299	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]	300	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]	301	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]	302
[b87a5ed]	303	/* punctuation */
	304	"[" { ASCIIOP_RETURN(); }
	305	"]" { ASCIIOP_RETURN(); }
	306	"(" { ASCIIOP_RETURN(); }
	307	")" { ASCIIOP_RETURN(); }
	308	"{" { ASCIIOP_RETURN(); }
	309	"}" { ASCIIOP_RETURN(); }
	310	"," { ASCIIOP_RETURN(); } // also operator
	311	":" { ASCIIOP_RETURN(); }
	312	";" { ASCIIOP_RETURN(); }
	313	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	314	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	315
[b87a5ed]	316	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	317	"<:" { RETURN_VAL('['); }
	318	":>" { RETURN_VAL(']'); }
	319	"<%" { RETURN_VAL('{'); }
	320	"%>" { RETURN_VAL('}'); }
[51b73452]	321
[b87a5ed]	322	/* operators */
	323	"!" { ASCIIOP_RETURN(); }
	324	"+" { ASCIIOP_RETURN(); }
	325	"-" { ASCIIOP_RETURN(); }
	326	"*" { ASCIIOP_RETURN(); }
	327	"/" { ASCIIOP_RETURN(); }
	328	"%" { ASCIIOP_RETURN(); }
	329	"^" { ASCIIOP_RETURN(); }
	330	"~" { ASCIIOP_RETURN(); }
	331	"&" { ASCIIOP_RETURN(); }
	332	"\|" { ASCIIOP_RETURN(); }
	333	"<" { ASCIIOP_RETURN(); }
	334	">" { ASCIIOP_RETURN(); }
	335	"=" { ASCIIOP_RETURN(); }
	336	"?" { ASCIIOP_RETURN(); }
[3848e0e]	337
	338	"++" { NAMEDOP_RETURN(ICR); }
	339	"--" { NAMEDOP_RETURN(DECR); }
	340	"==" { NAMEDOP_RETURN(EQ); }
	341	"!=" { NAMEDOP_RETURN(NE); }
	342	"<<" { NAMEDOP_RETURN(LS); }
	343	">>" { NAMEDOP_RETURN(RS); }
	344	"<=" { NAMEDOP_RETURN(LE); }
	345	">=" { NAMEDOP_RETURN(GE); }
	346	"&&" { NAMEDOP_RETURN(ANDAND); }
	347	"\|\|" { NAMEDOP_RETURN(OROR); }
	348	"->" { NAMEDOP_RETURN(ARROW); }
	349	"+=" { NAMEDOP_RETURN(PLUSassign); }
	350	"-=" { NAMEDOP_RETURN(MINUSassign); }
	351	"*=" { NAMEDOP_RETURN(MULTassign); }
	352	"/=" { NAMEDOP_RETURN(DIVassign); }
	353	"%=" { NAMEDOP_RETURN(MODassign); }
	354	"&=" { NAMEDOP_RETURN(ANDassign); }
	355	"\|=" { NAMEDOP_RETURN(ORassign); }
	356	"^=" { NAMEDOP_RETURN(ERassign); }
	357	"<<=" { NAMEDOP_RETURN(LSassign); }
	358	">>=" { NAMEDOP_RETURN(RSassign); }
[51b73452]	359
[08061589]	360	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[097e2b0]	361
[b87a5ed]	362	/* CFA, operator identifier */
	363	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	364	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[02e5ab6]	365	"^?{}" { IDENTIFIER_RETURN(); }
[b87a5ed]	366	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b73452]	367	/*
[b87a5ed]	368	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??"
	369	can be lexed as ""/"??" or "?"/"?". Since it is common practise to put a unary operator juxtaposed
	370	to an identifier, e.g., "*i", users will be annoyed if they cannot do this with respect to operator
	371	identifiers. Even with this special hack, there are 5 general cases that cannot be handled. The first
	372	case is for the function-call identifier "?()":
[51b73452]	373
	374	int * ?()(); // declaration: space required after '*'
	375	* ?()(); // expression: space required after '*'
	376
[b87a5ed]	377	Without the space, the string "*?()" is ambiguous without N character look ahead; it requires scanning
	378	ahead to determine if there is a '(', which is the start of an argument/parameter list.
[51b73452]	379
	380	The 4 remaining cases occur in expressions:
	381
	382	i++?i:0; // space required before '?'
	383	i--?i:0; // space required before '?'
	384	i?++i:0; // space required after '?'
	385	i?--i:0; // space required after '?'
	386
[b87a5ed]	387	In the first two cases, the string "i++?" is ambiguous, where this string can be lexed as "i"/"++?" or
	388	"i++"/"?"; it requires scanning ahead to determine if there is a '(', which is the start of an argument
	389	list. In the second two cases, the string "?++x" is ambiguous, where this string can be lexed as
	390	"?++"/"x" or "?"/"++x"; it requires scanning ahead to determine if there is a '(', which is the start of
	391	an argument list.
[51b73452]	392	*/
[02e5ab6]	393	{op_unary}"?"({op_unary_pre_post}\|"[?]"\|{op_binary_over}"?") {
[b87a5ed]	394	// 1 or 2 character unary operator ?
	395	int i = yytext[1] == '?' ? 1 : 2;
	396	yyless( i ); // put back characters up to first '?'
	397	if ( i > 1 ) {
	398	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	399	} else {
	400	ASCIIOP_RETURN();
	401	} // if
	402	}
	403
	404	/* unknown characters */
[3848e0e]	405	. { printf("unknown character(s):\"%s\" on line %d\n", yytext, yylineno); }
[51b73452]	406
	407	%%
	408
[b87a5ed]	409	// Local Variables: //
	410	// mode: c++ //
[de62360d]	411	// tab-width: 4 //
[b87a5ed]	412	// compile-command: "make install" //
	413	// End: //

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