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Last change on this file since ff5caaf was d69f4bb4, checked in by Peter A. Buhr <pabuhr@…>, 7 years ago
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[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
[d69f4bb4]	12	* Last Modified On : Wed Aug 29 15:02:41 2018
	13	* Update Count : 686
[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
[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
[51b73452]	37	#include <string>
[f487962]	38	#include <cstdio> // FILENAME_MAX
[9ed4f94]	39	using namespace std;
[51b73452]	40
[984dce6]	41	#include "ParseNode.h"
	42	#include "TypedefTable.h"
[51b73452]	43
	44	char *yyfilename;
[9ed4f94]	45	string *strtext; // accumulate parts of character and string constant value
[51b73452]	46
[de62360d]	47	#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
[9ed4f94]	48	#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
[926af74]	49	#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
[de62360d]	50	#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
[5f2f2d7]	51
[f487962]	52	#define WHITE_RETURN(x) // do nothing
[9ed4f94]	53	#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
[de62360d]	54	#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
[f487962]	55	#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
[de62360d]	56	#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
	57	#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
[4439008]	58	#define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword
[984dce6]	59	#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
[de62360d]	60	#define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER )
[51b73452]	61
[3848e0e]	62	void rm_underscore() {
[7e419e7]	63	// SKULLDUGGERY: remove underscores (ok to shorten?)
[e7aed49]	64	yyleng = 0;
[7e419e7]	65	for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string
[b87a5ed]	66	if ( yytext[i] != '_' ) {
[e7aed49]	67	yytext[yyleng] = yytext[i];
	68	yyleng += 1;
[b87a5ed]	69	} // if
	70	} // for
	71	yytext[yyleng] = '\0';
[7e419e7]	72	} // rm_underscore
[51b73452]	73
[7812f1d1]	74	// Stop warning due to incorrectly generated flex code.
	75	#pragma GCC diagnostic ignored "-Wsign-compare"
[51b73452]	76	%}
	77
[0a2168f]	78	binary [0-1]
[51b73452]	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
[b87a5ed]	91	// numeric constants, CFA: '_' in constant
[3848e0e]	92	hex_quad {hex}("_"?{hex}){3}
[201aeb9]	93	size_opt (8\|16\|32\|64\|128)?
	94	length ("ll"\|"LL"\|[lL]{size_opt})\|("hh"\|"HH"\|[hH])
[dc7db63]	95	integer_suffix_opt ("_"?(([uU]({length}?[iI]?)\|([iI]{length}))\|([iI]({length}?[uU]?)\|([uU]{length}))\|({length}([iI]?[uU]?)\|([uU][iI]))\|[zZ]))?
[51b73452]	96
	97	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	98	octal_prefix "0""_"?
[930f69e]	99	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix_opt}
[51b73452]	100
	101	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
[930f69e]	102	decimal_constant {nonzero_digits}{integer_suffix_opt}
[51b73452]	103
[0a2168f]	104	binary_digits ({binary})\|({binary}({binary}\|"_")*{binary})
	105	binary_prefix "0"[bB]"_"?
	106	binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt}
	107
[51b73452]	108	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	109	hex_prefix "0"[xX]"_"?
[930f69e]	110	hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
[51b73452]	111
[76c62b2]	112	// GCC: D (double) and iI (imaginary) suffixes, and DL (long double)
[51b73452]	113	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[201aeb9]	114	floating_size 32\|64\|80\|128
	115	floating_length ([fFdDlL]\|[lL]{floating_size})
	116	floating_suffix ({floating_length}?[iI]?)\|([iI]{floating_length})
[dc7db63]	117	floating_suffix_opt ("_"?({floating_suffix}\|"DL"))?
[f4b77f2]	118	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
[930f69e]	119	floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
	120	floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
	121	floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})\|({decimal_digits}{floating_fraction})
[51b73452]	122
	123	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
[dc7db63]	124	hex_floating_suffix_opt ("_"?({floating_suffix}))?
[930f69e]	125	hex_floating_fraction ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
[f4b77f2]	126	hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})\|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
[51b73452]	127
[b87a5ed]	128	// character escape sequence, GCC: \e => esc character
[51b73452]	129	simple_escape "\\"[abefnrtv'"?\\]
[930f69e]	130	// ' stop editor highlighting
[3848e0e]	131	octal_escape "\\"{octal}("_"?{octal}){0,2}
	132	hex_escape "\\""x""_"?{hex_digits}
[51b73452]	133	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	134	cwide_prefix "L"\|"U"\|"u"
	135	swide_prefix {cwide_prefix}\|"u8"
[51b73452]	136
[b87a5ed]	137	// display/white-space characters
[51b73452]	138	h_tab [\011]
	139	form_feed [\014]
	140	v_tab [\013]
	141	c_return [\015]
	142	h_white [ ]\|{h_tab}
	143
[e7aed49]	144	// overloadable operators
[51b73452]	145	op_unary_only "~"\|"!"
	146	op_unary_binary "+"\|"-"\|"*"
	147	op_unary_pre_post "++"\|"--"
	148	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	149
[994d080]	150	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
[51b73452]	151	op_binary_over {op_unary_binary}\|{op_binary_only}
[e7aed49]	152	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
	153	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
[51b73452]	154
	155	%x COMMENT
[3848e0e]	156	%x BKQUOTE
	157	%x QUOTE
	158	%x STRING
[51b73452]	159
	160	%%
[994d080]	161	/* line directives */
[4040425]	162	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
[930f69e]	163	/* " stop editor highlighting */
[c1c1112]	164	static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b73452]	165	char *end_num;
	166	char begin_string, end_string;
	167	long lineno, length;
	168	lineno = strtol( yytext + 1, &end_num, 0 );
	169	begin_string = strchr( end_num, '"' );
[f487962]	170	if ( begin_string ) { // file name ?
	171	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
	172	assert( end_string ); // closing quote ?
	173	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
	174	assert( length < FILENAME_MAX ); // room for sentinel ?
	175	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
	176	filename[ length ] = '\0'; // terminate string with sentinel
[9ed4f94]	177	//cout << "file " << filename << " line " << lineno << endl;
[f487962]	178	yylineno = lineno;
[c1c1112]	179	yyfilename = filename;
[b87a5ed]	180	} // if
[51b73452]	181	}
	182
[637dd9c]	183	/* preprocessor-style directives */
[61fc4f6]	184	^{h_white}"#"[^\n]"\n" { RETURN_VAL( DIRECTIVE ); }
[51b73452]	185
[cd623a4]	186	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	187	"/*" { BEGIN COMMENT; }
[cd623a4]	188	<COMMENT>.\|\n ;
	189	<COMMENT>"*/" { BEGIN 0; }
[51b73452]	190
[cd623a4]	191	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	192	"//"[^\n]*"\n" ;
[51b73452]	193
[b87a5ed]	194	/* ignore whitespace */
[3848e0e]	195	{h_white}+ { WHITE_RETURN(' '); }
	196	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	197	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b73452]	198
[b87a5ed]	199	/* keywords */
	200	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	201	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	202	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	203	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	204	asm { KEYWORD_RETURN(ASM); }
	205	__asm { KEYWORD_RETURN(ASM); } // GCC
	206	__asm__ { KEYWORD_RETURN(ASM); } // GCC
	207	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	208	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	209	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	210	auto { KEYWORD_RETURN(AUTO); }
[b87a5ed]	211	_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]	212	break { KEYWORD_RETURN(BREAK); }
	213	case { KEYWORD_RETURN(CASE); }
[b87a5ed]	214	catch { KEYWORD_RETURN(CATCH); } // CFA
[02e5ab6]	215	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
[3848e0e]	216	char { KEYWORD_RETURN(CHAR); }
[b87a5ed]	217	choose { KEYWORD_RETURN(CHOOSE); } // CFA
	218	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
	219	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
	220	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]	221	const { KEYWORD_RETURN(CONST); }
[b87a5ed]	222	__const { KEYWORD_RETURN(CONST); } // GCC
	223	__const__ { KEYWORD_RETURN(CONST); } // GCC
[3848e0e]	224	continue { KEYWORD_RETURN(CONTINUE); }
[e04b636]	225	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
[3848e0e]	226	default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]	227	disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]	228	do { KEYWORD_RETURN(DO); }
[3848e0e]	229	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	230	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	231	else { KEYWORD_RETURN(ELSE); }
[02e5ab6]	232	enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]	233	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	234	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[c27fb59]	235	exception { KEYWORD_RETURN(EXCEPTION); } // CFA
[3848e0e]	236	extern { KEYWORD_RETURN(EXTERN); }
[bd7f401]	237	fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
[35f730f]	238	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
[b87a5ed]	239	finally { KEYWORD_RETURN(FINALLY); } // CFA
[3848e0e]	240	float { KEYWORD_RETURN(FLOAT); }
[5c25eee]	241	_Float32 { KEYWORD_RETURN(FLOAT); } // GCC
	242	_Float32x { KEYWORD_RETURN(FLOAT); } // GCC
	243	_Float64 { KEYWORD_RETURN(DOUBLE); } // GCC
	244	_Float64x { KEYWORD_RETURN(DOUBLE); } // GCC
[201aeb9]	245	__float80 { KEYWORD_RETURN(FLOAT80); } // GCC
	246	float80 { KEYWORD_RETURN(FLOAT80); } // GCC
[5c25eee]	247	_Float128 { KEYWORD_RETURN(FLOAT128); } // GCC
	248	_Float128x { KEYWORD_RETURN(FLOAT128); } // GCC
[201aeb9]	249	__float128 { KEYWORD_RETURN(FLOAT128); } // GCC
	250	float128 { KEYWORD_RETURN(FLOAT128); } // GCC
[b87a5ed]	251	for { KEYWORD_RETURN(FOR); }
	252	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	253	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	254	ftype { KEYWORD_RETURN(FTYPE); } // CFA
	255	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	256	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	257	if { KEYWORD_RETURN(IF); }
	258	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	259	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	260	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	261	inline { KEYWORD_RETURN(INLINE); } // C99
	262	__inline { KEYWORD_RETURN(INLINE); } // GCC
	263	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	264	int { KEYWORD_RETURN(INT); }
[201aeb9]	265	__int128 { KEYWORD_RETURN(INT128); } // GCC
	266	int128 { KEYWORD_RETURN(INT128); } // GCC
[b87a5ed]	267	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	268	long { KEYWORD_RETURN(LONG); }
[6016c87]	269	monitor { KEYWORD_RETURN(MONITOR); } // CFA
[a7c90d4]	270	mutex { KEYWORD_RETURN(MUTEX); } // CFA
[b87a5ed]	271	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]	272	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[3a2128f]	273	one_t { NUMERIC_RETURN(ONE_T); } // CFA
[ce28c7b]	274	or { QKEYWORD_RETURN(WOR); } // CFA
[4040425]	275	otype { KEYWORD_RETURN(OTYPE); } // CFA
[3848e0e]	276	register { KEYWORD_RETURN(REGISTER); }
[b87a5ed]	277	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	278	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	279	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	280	return { KEYWORD_RETURN(RETURN); }
	281	short { KEYWORD_RETURN(SHORT); }
	282	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	283	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	284	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	285	sizeof { KEYWORD_RETURN(SIZEOF); }
	286	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	287	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	288	struct { KEYWORD_RETURN(STRUCT); }
	289	switch { KEYWORD_RETURN(SWITCH); }
[bd4d011]	290	thread { KEYWORD_RETURN(THREAD); } // C11
[b87a5ed]	291	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	292	throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]	293	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[5b2edbc]	294	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
[4040425]	295	trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]	296	try { KEYWORD_RETURN(TRY); } // CFA
[8f60f0b]	297	ttype { KEYWORD_RETURN(TTYPE); } // CFA
[3848e0e]	298	typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]	299	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	300	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	301	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[3848e0e]	302	union { KEYWORD_RETURN(UNION); }
	303	unsigned { KEYWORD_RETURN(UNSIGNED); }
[90c3b1c]	304	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
[72457b6]	305	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
[3848e0e]	306	void { KEYWORD_RETURN(VOID); }
	307	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	308	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	309	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[5b2edbc]	310	waitfor { KEYWORD_RETURN(WAITFOR); }
	311	when { KEYWORD_RETURN(WHEN); }
[3848e0e]	312	while { KEYWORD_RETURN(WHILE); }
[8b47e50]	313	with { KEYWORD_RETURN(WITH); } // CFA
[3a2128f]	314	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
[51b73452]	315
[b87a5ed]	316	/* identifier */
	317	{identifier} { IDENTIFIER_RETURN(); }
[7e419e7]	318	"`"{identifier}"`" { // CFA
	319	yytext[yyleng - 1] = '\0'; yytext += 1; // SKULLDUGGERY: remove backquotes (ok to shorten?)
[dc7db63]	320	IDENTIFIER_RETURN();
	321	}
[b87a5ed]	322	{attr_identifier} { ATTRIBUTE_RETURN(); }
[51b73452]	323
[b87a5ed]	324	/* numeric constants */
[0a2168f]	325	{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
[59db689]	326	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
[0a2168f]	327	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
[59db689]	328	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[930f69e]	329	{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
	330	{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
[3848e0e]	331	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	332	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b73452]	333
[b87a5ed]	334	/* character constant, allows empty value */
[9ed4f94]	335	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	336	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
[dc7db63]	337	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[930f69e]	338	/* ' stop editor highlighting */
[51b73452]	339
[b87a5ed]	340	/* string constant */
[9ed4f94]	341	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	342	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
[dc7db63]	343	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[930f69e]	344	/* " stop editor highlighting */
[51b73452]	345
[59db689]	346	/* common character/string constant */
[c1c1112]	347	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]	348	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]	349	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]	350
[b87a5ed]	351	/* punctuation */
[615a096]	352	"@" { ASCIIOP_RETURN(); }
[dc7db63]	353	"`" { ASCIIOP_RETURN(); }
[b87a5ed]	354	"[" { ASCIIOP_RETURN(); }
	355	"]" { ASCIIOP_RETURN(); }
	356	"(" { ASCIIOP_RETURN(); }
	357	")" { ASCIIOP_RETURN(); }
	358	"{" { ASCIIOP_RETURN(); }
	359	"}" { ASCIIOP_RETURN(); }
	360	"," { ASCIIOP_RETURN(); } // also operator
	361	":" { ASCIIOP_RETURN(); }
	362	";" { ASCIIOP_RETURN(); }
	363	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	364	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	365
[b87a5ed]	366	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	367	"<:" { RETURN_VAL('['); }
	368	":>" { RETURN_VAL(']'); }
	369	"<%" { RETURN_VAL('{'); }
	370	"%>" { RETURN_VAL('}'); }
[51b73452]	371
[b87a5ed]	372	/* operators */
	373	"!" { ASCIIOP_RETURN(); }
	374	"+" { ASCIIOP_RETURN(); }
	375	"-" { ASCIIOP_RETURN(); }
	376	"*" { ASCIIOP_RETURN(); }
[e5f2a67]	377	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
[b87a5ed]	378	"/" { ASCIIOP_RETURN(); }
	379	"%" { ASCIIOP_RETURN(); }
	380	"^" { ASCIIOP_RETURN(); }
	381	"~" { ASCIIOP_RETURN(); }
	382	"&" { ASCIIOP_RETURN(); }
	383	"\|" { ASCIIOP_RETURN(); }
	384	"<" { ASCIIOP_RETURN(); }
	385	">" { ASCIIOP_RETURN(); }
	386	"=" { ASCIIOP_RETURN(); }
	387	"?" { ASCIIOP_RETURN(); }
[3848e0e]	388
	389	"++" { NAMEDOP_RETURN(ICR); }
	390	"--" { NAMEDOP_RETURN(DECR); }
	391	"==" { NAMEDOP_RETURN(EQ); }
	392	"!=" { NAMEDOP_RETURN(NE); }
	393	"<<" { NAMEDOP_RETURN(LS); }
	394	">>" { NAMEDOP_RETURN(RS); }
	395	"<=" { NAMEDOP_RETURN(LE); }
	396	">=" { NAMEDOP_RETURN(GE); }
	397	"&&" { NAMEDOP_RETURN(ANDAND); }
	398	"\|\|" { NAMEDOP_RETURN(OROR); }
	399	"->" { NAMEDOP_RETURN(ARROW); }
	400	"+=" { NAMEDOP_RETURN(PLUSassign); }
	401	"-=" { NAMEDOP_RETURN(MINUSassign); }
[e5f2a67]	402	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
[3848e0e]	403	"*=" { NAMEDOP_RETURN(MULTassign); }
	404	"/=" { NAMEDOP_RETURN(DIVassign); }
	405	"%=" { NAMEDOP_RETURN(MODassign); }
	406	"&=" { NAMEDOP_RETURN(ANDassign); }
	407	"\|=" { NAMEDOP_RETURN(ORassign); }
	408	"^=" { NAMEDOP_RETURN(ERassign); }
	409	"<<=" { NAMEDOP_RETURN(LSassign); }
	410	">>=" { NAMEDOP_RETURN(RSassign); }
[51b73452]	411
[08061589]	412	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[d69f4bb4]	413	"~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
	414	"-~" { NAMEDOP_RETURN(ErangeDown); } // CFA
	415	"-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA
[097e2b0]	416
[b87a5ed]	417	/* CFA, operator identifier */
	418	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	419	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[76c62b2]	420	"^?{}" { IDENTIFIER_RETURN(); }
[7e419e7]	421	"?`"{identifier} { IDENTIFIER_RETURN(); } // postfix operator
[b87a5ed]	422	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b73452]	423	/*
[daf9671]	424	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
	425	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
	426	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
	427	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
	428	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
	429	identifier to disambiguate this common case.
	430
	431	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
	432	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
	433	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
	434	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
	435	any meaningful program.
	436
	437	The remaining cases are with the increment/decrement operators and conditional expression:
	438
	439	i++? ...(...);
	440	i?++ ...(...);
	441
	442	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
	443	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
	444	space:
	445
	446	i++ ? i : 0;
	447	i? ++i : 0;
[51b73452]	448	*/
[daf9671]	449	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
[b87a5ed]	450	// 1 or 2 character unary operator ?
	451	int i = yytext[1] == '?' ? 1 : 2;
	452	yyless( i ); // put back characters up to first '?'
	453	if ( i > 1 ) {
	454	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	455	} else {
	456	ASCIIOP_RETURN();
	457	} // if
	458	}
	459
[9ed4f94]	460	/* unknown character */
	461	. { yyerror( "unknown character" ); }
[51b73452]	462
	463	%%
[8551b859]	464
[9ed4f94]	465	// ----end of lexer----
	466
	467	void yyerror( const char * errmsg ) {
[8551b859]	468	SemanticErrorThrow = true;
[a8615fd1]	469	cerr << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
[a16764a6]	470	<< ": " << ErrorHelpers::error_str() << errmsg << " at token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
[9ed4f94]	471	}
[51b73452]	472
[b87a5ed]	473	// Local Variables: //
	474	// mode: c++ //
[de62360d]	475	// tab-width: 4 //
[b87a5ed]	476	// compile-command: "make install" //
	477	// End: //

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