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lex.ll @ cd623a4

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsctordeferred_resndemanglerenumforall-pointer-decaygc_noraiijacob/cs343-translationjenkins-sandboxmemorynew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newstringwith_gc

Last change on this file since cd623a4 was cd623a4, checked in by Peter A. Buhr <pabuhr@…>, 9 years ago
constant types, second attempt
Property mode set to `100644`
File size: 15.0 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.
[51b7345]	6	*
	7	* lex.l --
	8	*
	9	* Author : Peter A. Buhr
	10	* Created On : Sat Sep 22 08:58:10 2001
	11	* Last Modified By : Peter A. Buhr
[cd623a4]	12	* Last Modified On : Sun Jun 7 07:14:16 2015
	13	* Update Count : 374
[51b7345]	14	*/
	15
	16	%option yylineno
	17
	18	%{
[b87a5ed]	19	// This lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive
	20	// have been performed and removed from the source. The only exceptions are preprocessor directives passed to
	21	// the compiler (e.g., line-number directives) and C/C++ style comments, which are ignored.
[51b7345]	22
[8c17ab0]	23	//************************** Includes and Defines **************************
[51b7345]	24
	25	#include <string>
	26
	27	#include "lex.h"
	28	#include "ParseNode.h"
[59db689]	29	#include "parser.h" // YACC generated definitions based on C++ grammar
[51b7345]	30
	31	char *yyfilename;
[b87a5ed]	32	std::string *strtext; // accumulate parts of character and string constant value
[51b7345]	33
[b87a5ed]	34	#define WHITE_RETURN(x) // do nothing
[51b7345]	35	#define NEWLINE_RETURN() WHITE_RETURN('\n')
[59db689]	36	#define RETURN_VAL(x) yylval.tok.str = new std::string( yytext ); \
[b87a5ed]	37	yylval.tok.loc.file = yyfilename; \
	38	yylval.tok.loc.line = yylineno; \
	39	return(x)
[3848e0e]	40	#define RETURN_STR(x) yylval.tok.str = strtext; \
[b87a5ed]	41	yylval.tok.loc.file = yyfilename; \
	42	yylval.tok.loc.line = yylineno; \
	43	return(x)
[51b7345]	44
[b87a5ed]	45	#define KEYWORD_RETURN(x) RETURN_VAL(x) // keyword
[51b7345]	46	#define IDENTIFIER_RETURN() RETURN_VAL((typedefTable.isIdentifier(yytext) ? IDENTIFIER : typedefTable.isTypedef(yytext) ? TYPEDEFname : TYPEGENname))
[8c17ab0]	47	//#define ATTRIBUTE_RETURN() RETURN_VAL((typedefTable.isIdentifier(yytext) ? ATTR_IDENTIFIER : typedefTable.isTypedef(yytext) ? ATTR_TYPEDEFname : ATTR_TYPEGENname))
	48	#define ATTRIBUTE_RETURN() RETURN_VAL(ATTR_IDENTIFIER)
[51b7345]	49
[b87a5ed]	50	#define ASCIIOP_RETURN() RETURN_VAL((int)yytext[0]) // single character operator
	51	#define NAMEDOP_RETURN(x) RETURN_VAL(x) // multichar operator, with a name
[51b7345]	52
[8c17ab0]	53	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL(x) // numeric constant
[51b7345]	54
[3848e0e]	55	void rm_underscore() {
[b87a5ed]	56	// remove underscores in numeric constant
	57	int j = 0;
	58	for ( int i = 0; yytext[i] != '\0'; i += 1 ) {
	59	if ( yytext[i] != '_' ) {
	60	yytext[j] = yytext[i];
	61	j += 1;
	62	} // if
	63	} // for
	64	yyleng = j;
	65	yytext[yyleng] = '\0';
[51b7345]	66	}
	67
	68	%}
	69
	70	octal [0-7]
	71	nonzero [1-9]
	72	decimal [0-9]
	73	hex [0-9a-fA-F]
[3848e0e]	74	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
[51b7345]	75
[b87a5ed]	76	// identifier, GCC: $ in identifier
[51b7345]	77	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
	78
[b87a5ed]	79	// quoted identifier
[8c17ab0]	80	quoted_identifier "`"{identifier}"`"
	81
[b87a5ed]	82	// attribute identifier, GCC: $ in identifier
[51b7345]	83	attr_identifier "@"{identifier}
	84
[b87a5ed]	85	// numeric constants, CFA: '_' in constant
[3848e0e]	86	hex_quad {hex}("_"?{hex}){3}
[51b7345]	87	integer_suffix "_"?(([uU][lL]?)\|([uU]("ll"\|"LL")?)\|([lL][uU]?)\|("ll"\|"LL")[uU]?)
	88
	89	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	90	octal_prefix "0""_"?
	91	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix}?
	92
	93	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
	94	decimal_constant {nonzero_digits}{integer_suffix}?
	95
	96	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	97	hex_prefix "0"[xX]"_"?
	98	hex_constant {hex_prefix}{hex_digits}{integer_suffix}?
	99
	100	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
	101	fractional_constant ({decimal_digits}?"."{decimal_digits})\|({decimal_digits}".")
	102	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
	103	floating_suffix "_"?[flFL]
	104	floating_constant (({fractional_constant}{exponent}?)\|({decimal_digits}{exponent})){floating_suffix}?
	105
	106	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
	107	hex_fractional_constant ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
	108	hex_floating_constant {hex_prefix}(({hex_fractional_constant}{binary_exponent})\|({hex_digits}{binary_exponent})){floating_suffix}?
	109
[b87a5ed]	110	// character escape sequence, GCC: \e => esc character
[51b7345]	111	simple_escape "\\"[abefnrtv'"?\\]
[b87a5ed]	112	// ' stop highlighting
[3848e0e]	113	octal_escape "\\"{octal}("_"?{octal}){0,2}
	114	hex_escape "\\""x""_"?{hex_digits}
[51b7345]	115	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	116	cwide_prefix "L"\|"U"\|"u"
	117	swide_prefix {cwide_prefix}\|"u8"
[51b7345]	118
[b87a5ed]	119	// display/white-space characters
[51b7345]	120	h_tab [\011]
	121	form_feed [\014]
	122	v_tab [\013]
	123	c_return [\015]
	124	h_white [ ]\|{h_tab}
	125
[b87a5ed]	126	// operators
[51b7345]	127	op_unary_only "~"\|"!"
	128	op_unary_binary "+"\|"-"\|"*"
	129	op_unary_pre_post "++"\|"--"
	130	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	131
	132	op_binary_only "/"\|"%"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"&="\|"\|="\|"^="\|"<<="\|">>="
	133	op_binary_over {op_unary_binary}\|{op_binary_only}
	134	op_binary_not_over "?"\|"->"\|"&&"\|"\|\|"
	135	operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
	136
	137	%x COMMENT
[3848e0e]	138	%x BKQUOTE
	139	%x QUOTE
	140	%x STRING
[51b7345]	141
	142	%%
[b87a5ed]	143	/* line directives */
[51b7345]	144	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["][^\n]"\n" {
[8c17ab0]	145	/* " stop highlighting */
[51b7345]	146	char *end_num;
	147	char begin_string, end_string;
	148	char *filename;
	149	long lineno, length;
	150	lineno = strtol( yytext + 1, &end_num, 0 );
	151	begin_string = strchr( end_num, '"' );
[3848e0e]	152	if ( begin_string ) {
[b87a5ed]	153	end_string = strchr( begin_string + 1, '"' );
	154	if ( end_string ) {
	155	length = end_string - begin_string - 1;
	156	filename = new char[ length + 1 ];
	157	memcpy( filename, begin_string + 1, length );
	158	filename[ length ] = '\0';
	159	//std::cout << "file " << filename << " line " << lineno << std::endl;
	160	yylineno = lineno;
	161	yyfilename = filename;
	162	} // if
	163	} // if
[51b7345]	164	}
	165
[b87a5ed]	166	/* ignore preprocessor directives (for now) */
[51b7345]	167	^{h_white}"#"[^\n]"\n" ;
	168
[cd623a4]	169	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	170	"/*" { BEGIN COMMENT; }
[cd623a4]	171	<COMMENT>.\|\n ;
	172	<COMMENT>"*/" { BEGIN 0; }
[51b7345]	173
[cd623a4]	174	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	175	"//"[^\n]*"\n" ;
[51b7345]	176
[b87a5ed]	177	/* ignore whitespace */
[3848e0e]	178	{h_white}+ { WHITE_RETURN(' '); }
	179	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	180	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b7345]	181
[b87a5ed]	182	/* keywords */
	183	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	184	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	185	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	186	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	187	asm { KEYWORD_RETURN(ASM); }
	188	__asm { KEYWORD_RETURN(ASM); } // GCC
	189	__asm__ { KEYWORD_RETURN(ASM); } // GCC
	190	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	191	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	192	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	193	auto { KEYWORD_RETURN(AUTO); }
[b87a5ed]	194	_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]	195	break { KEYWORD_RETURN(BREAK); }
	196	case { KEYWORD_RETURN(CASE); }
[b87a5ed]	197	catch { KEYWORD_RETURN(CATCH); } // CFA
[3848e0e]	198	char { KEYWORD_RETURN(CHAR); }
[b87a5ed]	199	choose { KEYWORD_RETURN(CHOOSE); } // CFA
	200	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
	201	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
	202	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]	203	const { KEYWORD_RETURN(CONST); }
[b87a5ed]	204	__const { KEYWORD_RETURN(CONST); } // GCC
	205	__const__ { KEYWORD_RETURN(CONST); } // GCC
	206	context { KEYWORD_RETURN(CONTEXT); } // CFA
[3848e0e]	207	continue { KEYWORD_RETURN(CONTINUE); }
	208	default { KEYWORD_RETURN(DEFAULT); }
[b87a5ed]	209	do { KEYWORD_RETURN(DO); }
[3848e0e]	210	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	211	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	212	else { KEYWORD_RETURN(ELSE); }
	213	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	214	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[3848e0e]	215	extern { KEYWORD_RETURN(EXTERN); }
[b87a5ed]	216	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
	217	finally { KEYWORD_RETURN(FINALLY); } // CFA
[3848e0e]	218	float { KEYWORD_RETURN(FLOAT); }
[b87a5ed]	219	__float128 { KEYWORD_RETURN(FLOAT); } // GCC
	220	for { KEYWORD_RETURN(FOR); }
	221	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	222	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	223	ftype { KEYWORD_RETURN(FTYPE); } // CFA
	224	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	225	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	226	if { KEYWORD_RETURN(IF); }
	227	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	228	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	229	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	230	inline { KEYWORD_RETURN(INLINE); } // C99
	231	__inline { KEYWORD_RETURN(INLINE); } // GCC
	232	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	233	int { KEYWORD_RETURN(INT); }
	234	__int128 { KEYWORD_RETURN(INT); } // GCC
	235	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	236	long { KEYWORD_RETURN(LONG); }
[b87a5ed]	237	lvalue { KEYWORD_RETURN(LVALUE); } // CFA
	238	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[3848e0e]	239	register { KEYWORD_RETURN(REGISTER); }
[b87a5ed]	240	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	241	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	242	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	243	return { KEYWORD_RETURN(RETURN); }
	244	short { KEYWORD_RETURN(SHORT); }
	245	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	246	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	247	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	248	sizeof { KEYWORD_RETURN(SIZEOF); }
	249	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	250	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	251	struct { KEYWORD_RETURN(STRUCT); }
	252	switch { KEYWORD_RETURN(SWITCH); }
[b87a5ed]	253	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	254	throw { KEYWORD_RETURN(THROW); } // CFA
	255	try { KEYWORD_RETURN(TRY); } // CFA
	256	type { KEYWORD_RETURN(TYPE); } // 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); }
	263	void { KEYWORD_RETURN(VOID); }
	264	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	265	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	266	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[3848e0e]	267	while { KEYWORD_RETURN(WHILE); }
[51b7345]	268
[b87a5ed]	269	/* identifier */
	270	{identifier} { IDENTIFIER_RETURN(); }
	271	{attr_identifier} { ATTRIBUTE_RETURN(); }
[3848e0e]	272	"`" { BEGIN BKQUOTE; }
[b87a5ed]	273	<BKQUOTE>{identifier} { IDENTIFIER_RETURN(); }
	274	<BKQUOTE>"`" { BEGIN 0; }
[51b7345]	275
[b87a5ed]	276	/* numeric constants */
	277	"0" { NUMERIC_RETURN(ZERO); } // CFA
	278	"1" { NUMERIC_RETURN(ONE); } // CFA
[59db689]	279	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	280	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
	281	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[3848e0e]	282	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	283	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b7345]	284
[b87a5ed]	285	/* character constant, allows empty value */
[59db689]	286	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new std::string; *strtext += std::string( yytext ); }
[b87a5ed]	287	<QUOTE>[^'\\\n]* { *strtext += std::string( yytext ); }
	288	<QUOTE>['\n] { BEGIN 0; *strtext += std::string( yytext); RETURN_STR(CHARACTERconstant); }
	289	/* ' stop highlighting */
[51b7345]	290
[b87a5ed]	291	/* string constant */
[59db689]	292	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new std::string; *strtext += std::string( yytext ); }
[b87a5ed]	293	<STRING>[^"\\\n]* { *strtext += std::string( yytext ); }
[59db689]	294	<STRING>["\n] { BEGIN 0; *strtext += std::string( yytext ); RETURN_STR(STRINGliteral); }
[b87a5ed]	295	/* " stop highlighting */
[51b7345]	296
[59db689]	297	/* common character/string constant */
[3848e0e]	298	<QUOTE,STRING>{escape_seq} { rm_underscore(); *strtext += std::string( yytext ); }
[cd623a4]	299	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[59db689]	300	<QUOTE,STRING>"\\" { *strtext += std::string( yytext ); } // unknown escape character
[3848e0e]	301
[b87a5ed]	302	/* punctuation */
	303	"[" { ASCIIOP_RETURN(); }
	304	"]" { ASCIIOP_RETURN(); }
	305	"(" { ASCIIOP_RETURN(); }
	306	")" { ASCIIOP_RETURN(); }
	307	"{" { ASCIIOP_RETURN(); }
	308	"}" { ASCIIOP_RETURN(); }
	309	"," { ASCIIOP_RETURN(); } // also operator
	310	":" { ASCIIOP_RETURN(); }
	311	";" { ASCIIOP_RETURN(); }
	312	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	313	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	314
[b87a5ed]	315	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	316	"<:" { RETURN_VAL('['); }
	317	":>" { RETURN_VAL(']'); }
	318	"<%" { RETURN_VAL('{'); }
	319	"%>" { RETURN_VAL('}'); }
[51b7345]	320
[b87a5ed]	321	/* operators */
	322	"!" { ASCIIOP_RETURN(); }
	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(); }
[3848e0e]	336
	337	"++" { NAMEDOP_RETURN(ICR); }
	338	"--" { NAMEDOP_RETURN(DECR); }
	339	"==" { NAMEDOP_RETURN(EQ); }
	340	"!=" { NAMEDOP_RETURN(NE); }
	341	"<<" { NAMEDOP_RETURN(LS); }
	342	">>" { NAMEDOP_RETURN(RS); }
	343	"<=" { NAMEDOP_RETURN(LE); }
	344	">=" { NAMEDOP_RETURN(GE); }
	345	"&&" { NAMEDOP_RETURN(ANDAND); }
	346	"\|\|" { NAMEDOP_RETURN(OROR); }
	347	"->" { NAMEDOP_RETURN(ARROW); }
	348	"+=" { NAMEDOP_RETURN(PLUSassign); }
	349	"-=" { NAMEDOP_RETURN(MINUSassign); }
	350	"*=" { NAMEDOP_RETURN(MULTassign); }
	351	"/=" { NAMEDOP_RETURN(DIVassign); }
	352	"%=" { NAMEDOP_RETURN(MODassign); }
	353	"&=" { NAMEDOP_RETURN(ANDassign); }
	354	"\|=" { NAMEDOP_RETURN(ORassign); }
	355	"^=" { NAMEDOP_RETURN(ERassign); }
	356	"<<=" { NAMEDOP_RETURN(LSassign); }
	357	">>=" { NAMEDOP_RETURN(RSassign); }
[51b7345]	358
[b87a5ed]	359	/* CFA, operator identifier */
	360	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	361	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[b87a5ed]	362	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b7345]	363	/*
[b87a5ed]	364	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??"
	365	can be lexed as ""/"??" or "?"/"?". Since it is common practise to put a unary operator juxtaposed
	366	to an identifier, e.g., "*i", users will be annoyed if they cannot do this with respect to operator
	367	identifiers. Even with this special hack, there are 5 general cases that cannot be handled. The first
	368	case is for the function-call identifier "?()":
[51b7345]	369
	370	int * ?()(); // declaration: space required after '*'
	371	* ?()(); // expression: space required after '*'
	372
[b87a5ed]	373	Without the space, the string "*?()" is ambiguous without N character look ahead; it requires scanning
	374	ahead to determine if there is a '(', which is the start of an argument/parameter list.
[51b7345]	375
	376	The 4 remaining cases occur in expressions:
	377
	378	i++?i:0; // space required before '?'
	379	i--?i:0; // space required before '?'
	380	i?++i:0; // space required after '?'
	381	i?--i:0; // space required after '?'
	382
[b87a5ed]	383	In the first two cases, the string "i++?" is ambiguous, where this string can be lexed as "i"/"++?" or
	384	"i++"/"?"; it requires scanning ahead to determine if there is a '(', which is the start of an argument
	385	list. In the second two cases, the string "?++x" is ambiguous, where this string can be lexed as
	386	"?++"/"x" or "?"/"++x"; it requires scanning ahead to determine if there is a '(', which is the start of
	387	an argument list.
[51b7345]	388	*/
	389	{op_unary}"?"(({op_unary_pre_post}\|"[?]")\|({op_binary_over}"?")) {
[b87a5ed]	390	// 1 or 2 character unary operator ?
	391	int i = yytext[1] == '?' ? 1 : 2;
	392	yyless( i ); // put back characters up to first '?'
	393	if ( i > 1 ) {
	394	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	395	} else {
	396	ASCIIOP_RETURN();
	397	} // if
	398	}
	399
	400	/* unknown characters */
[3848e0e]	401	. { printf("unknown character(s):\"%s\" on line %d\n", yytext, yylineno); }
[51b7345]	402
	403	%%
	404
[b87a5ed]	405	// Local Variables: //
	406	// fill-column: 110 //
	407	// tab-width: 4 //
	408	// mode: c++ //
	409	// compile-command: "make install" //
	410	// End: //

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