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lex.ll@ c194661

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Last change on this file since c194661 was 8551b859, checked in by Peter A. Buhr <pabuhr@…>, 7 years ago
set SemanticErrorThrow for parse error
Property mode set to `100644`
File size: 18.4 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
[8551b859]	12	* Last Modified On : Thu Jun 7 08:27:40 2018
	13	* Update Count : 679
[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() {
[7e419e7]	56	// SKULLDUGGERY: remove underscores (ok to shorten?)
[e7aed49]	57	yyleng = 0;
[7e419e7]	58	for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string
[b87a5ed]	59	if ( yytext[i] != '_' ) {
[e7aed49]	60	yytext[yyleng] = yytext[i];
	61	yyleng += 1;
[b87a5ed]	62	} // if
	63	} // for
	64	yytext[yyleng] = '\0';
[7e419e7]	65	} // rm_underscore
[51b73452]	66
[7812f1d1]	67	// Stop warning due to incorrectly generated flex code.
	68	#pragma GCC diagnostic ignored "-Wsign-compare"
[51b73452]	69	%}
	70
[0a2168f]	71	binary [0-1]
[51b73452]	72	octal [0-7]
	73	nonzero [1-9]
	74	decimal [0-9]
	75	hex [0-9a-fA-F]
[3848e0e]	76	universal_char "\\"((u"_"?{hex_quad})\|(U"_"?{hex_quad}{2}))
[51b73452]	77
[b87a5ed]	78	// identifier, GCC: $ in identifier
[51b73452]	79	identifier ([a-zA-Z_$]\|{universal_char})([0-9a-zA-Z_$]\|{universal_char})*
	80
[b87a5ed]	81	// attribute identifier, GCC: $ in identifier
[51b73452]	82	attr_identifier "@"{identifier}
	83
[b87a5ed]	84	// numeric constants, CFA: '_' in constant
[3848e0e]	85	hex_quad {hex}("_"?{hex}){3}
[201aeb9]	86	size_opt (8\|16\|32\|64\|128)?
	87	length ("ll"\|"LL"\|[lL]{size_opt})\|("hh"\|"HH"\|[hH])
[dc7db63]	88	integer_suffix_opt ("_"?(([uU]({length}?[iI]?)\|([iI]{length}))\|([iI]({length}?[uU]?)\|([uU]{length}))\|({length}([iI]?[uU]?)\|([uU][iI]))\|[zZ]))?
[51b73452]	89
	90	octal_digits ({octal})\|({octal}({octal}\|"_")*{octal})
	91	octal_prefix "0""_"?
[930f69e]	92	octal_constant (("0")\|({octal_prefix}{octal_digits})){integer_suffix_opt}
[51b73452]	93
	94	nonzero_digits ({nonzero})\|({nonzero}({decimal}\|"_")*{decimal})
[930f69e]	95	decimal_constant {nonzero_digits}{integer_suffix_opt}
[51b73452]	96
[0a2168f]	97	binary_digits ({binary})\|({binary}({binary}\|"_")*{binary})
	98	binary_prefix "0"[bB]"_"?
	99	binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt}
	100
[51b73452]	101	hex_digits ({hex})\|({hex}({hex}\|"_")*{hex})
	102	hex_prefix "0"[xX]"_"?
[930f69e]	103	hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
[51b73452]	104
[76c62b2]	105	// GCC: D (double) and iI (imaginary) suffixes, and DL (long double)
[51b73452]	106	exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[201aeb9]	107	floating_size 32\|64\|80\|128
	108	floating_length ([fFdDlL]\|[lL]{floating_size})
	109	floating_suffix ({floating_length}?[iI]?)\|([iI]{floating_length})
[dc7db63]	110	floating_suffix_opt ("_"?({floating_suffix}\|"DL"))?
[f4b77f2]	111	decimal_digits ({decimal})\|({decimal}({decimal}\|"_")*{decimal})
[930f69e]	112	floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
	113	floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
	114	floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})\|({decimal_digits}{floating_fraction})
[51b73452]	115
	116	binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
[dc7db63]	117	hex_floating_suffix_opt ("_"?({floating_suffix}))?
[930f69e]	118	hex_floating_fraction ({hex_digits}?"."{hex_digits})\|({hex_digits}".")
[f4b77f2]	119	hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})\|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
[51b73452]	120
[b87a5ed]	121	// character escape sequence, GCC: \e => esc character
[51b73452]	122	simple_escape "\\"[abefnrtv'"?\\]
[930f69e]	123	// ' stop editor highlighting
[3848e0e]	124	octal_escape "\\"{octal}("_"?{octal}){0,2}
	125	hex_escape "\\""x""_"?{hex_digits}
[51b73452]	126	escape_seq {simple_escape}\|{octal_escape}\|{hex_escape}\|{universal_char}
[59db689]	127	cwide_prefix "L"\|"U"\|"u"
	128	swide_prefix {cwide_prefix}\|"u8"
[51b73452]	129
[b87a5ed]	130	// display/white-space characters
[51b73452]	131	h_tab [\011]
	132	form_feed [\014]
	133	v_tab [\013]
	134	c_return [\015]
	135	h_white [ ]\|{h_tab}
	136
[e7aed49]	137	// overloadable operators
[51b73452]	138	op_unary_only "~"\|"!"
	139	op_unary_binary "+"\|"-"\|"*"
	140	op_unary_pre_post "++"\|"--"
	141	op_unary {op_unary_only}\|{op_unary_binary}\|{op_unary_pre_post}
	142
[994d080]	143	op_binary_only "/"\|"%"\|"\\"\|"^"\|"&"\|"\|"\|"<"\|">"\|"="\|"=="\|"!="\|"<<"\|">>"\|"<="\|">="\|"+="\|"-="\|"*="\|"/="\|"%="\|"\\="\|"&="\|"\|="\|"^="\|"<<="\|">>="
[51b73452]	144	op_binary_over {op_unary_binary}\|{op_binary_only}
[e7aed49]	145	// op_binary_not_over "?"\|"->"\|"."\|"&&"\|"\|\|"\|"@="
	146	// operator {op_unary_pre_post}\|{op_binary_over}\|{op_binary_not_over}
[51b73452]	147
	148	%x COMMENT
[3848e0e]	149	%x BKQUOTE
	150	%x QUOTE
	151	%x STRING
[51b73452]	152
	153	%%
[994d080]	154	/* line directives */
[4040425]	155	^{h_white}"#"{h_white}[0-9]+{h_white}["][^"\n]+["]."\n" {
[930f69e]	156	/* " stop editor highlighting */
[c1c1112]	157	static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b73452]	158	char *end_num;
	159	char begin_string, end_string;
	160	long lineno, length;
	161	lineno = strtol( yytext + 1, &end_num, 0 );
	162	begin_string = strchr( end_num, '"' );
[f487962]	163	if ( begin_string ) { // file name ?
	164	end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
	165	assert( end_string ); // closing quote ?
	166	length = end_string - begin_string - 1; // file-name length without quotes or sentinel
	167	assert( length < FILENAME_MAX ); // room for sentinel ?
	168	memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
	169	filename[ length ] = '\0'; // terminate string with sentinel
[9ed4f94]	170	//cout << "file " << filename << " line " << lineno << endl;
[f487962]	171	yylineno = lineno;
[c1c1112]	172	yyfilename = filename;
[b87a5ed]	173	} // if
[51b73452]	174	}
	175
[637dd9c]	176	/* preprocessor-style directives */
[61fc4f6]	177	^{h_white}"#"[^\n]"\n" { RETURN_VAL( DIRECTIVE ); }
[51b73452]	178
[cd623a4]	179	/* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]	180	"/*" { BEGIN COMMENT; }
[cd623a4]	181	<COMMENT>.\|\n ;
	182	<COMMENT>"*/" { BEGIN 0; }
[51b73452]	183
[cd623a4]	184	/* ignore C++ style comments (ALSO HANDLED BY CPP) */
	185	"//"[^\n]*"\n" ;
[51b73452]	186
[b87a5ed]	187	/* ignore whitespace */
[3848e0e]	188	{h_white}+ { WHITE_RETURN(' '); }
	189	({v_tab}\|{c_return}\|{form_feed})+ { WHITE_RETURN(' '); }
	190	({h_white}\|{v_tab}\|{c_return}\|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b73452]	191
[b87a5ed]	192	/* keywords */
	193	_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
	194	_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
	195	__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
	196	__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
	197	asm { KEYWORD_RETURN(ASM); }
	198	__asm { KEYWORD_RETURN(ASM); } // GCC
	199	__asm__ { KEYWORD_RETURN(ASM); } // GCC
	200	_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
	201	__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
	202	__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]	203	auto { KEYWORD_RETURN(AUTO); }
[b87a5ed]	204	_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]	205	break { KEYWORD_RETURN(BREAK); }
	206	case { KEYWORD_RETURN(CASE); }
[b87a5ed]	207	catch { KEYWORD_RETURN(CATCH); } // CFA
[02e5ab6]	208	catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA
[3848e0e]	209	char { KEYWORD_RETURN(CHAR); }
[b87a5ed]	210	choose { KEYWORD_RETURN(CHOOSE); } // CFA
	211	_Complex { KEYWORD_RETURN(COMPLEX); } // C99
	212	__complex { KEYWORD_RETURN(COMPLEX); } // GCC
	213	__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]	214	const { KEYWORD_RETURN(CONST); }
[b87a5ed]	215	__const { KEYWORD_RETURN(CONST); } // GCC
	216	__const__ { KEYWORD_RETURN(CONST); } // GCC
[3848e0e]	217	continue { KEYWORD_RETURN(CONTINUE); }
[e04b636]	218	coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
[3848e0e]	219	default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]	220	disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]	221	do { KEYWORD_RETURN(DO); }
[3848e0e]	222	double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]	223	dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]	224	else { KEYWORD_RETURN(ELSE); }
[02e5ab6]	225	enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]	226	enum { KEYWORD_RETURN(ENUM); }
[b87a5ed]	227	__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[c27fb59]	228	exception { KEYWORD_RETURN(EXCEPTION); } // CFA
[3848e0e]	229	extern { KEYWORD_RETURN(EXTERN); }
[bd7f401]	230	fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
[35f730f]	231	fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
[b87a5ed]	232	finally { KEYWORD_RETURN(FINALLY); } // CFA
[3848e0e]	233	float { KEYWORD_RETURN(FLOAT); }
[5c25eee]	234	_Float32 { KEYWORD_RETURN(FLOAT); } // GCC
	235	_Float32x { KEYWORD_RETURN(FLOAT); } // GCC
	236	_Float64 { KEYWORD_RETURN(DOUBLE); } // GCC
	237	_Float64x { KEYWORD_RETURN(DOUBLE); } // GCC
[201aeb9]	238	__float80 { KEYWORD_RETURN(FLOAT80); } // GCC
	239	float80 { KEYWORD_RETURN(FLOAT80); } // GCC
[5c25eee]	240	_Float128 { KEYWORD_RETURN(FLOAT128); } // GCC
	241	_Float128x { KEYWORD_RETURN(FLOAT128); } // GCC
[201aeb9]	242	__float128 { KEYWORD_RETURN(FLOAT128); } // GCC
	243	float128 { KEYWORD_RETURN(FLOAT128); } // GCC
[b87a5ed]	244	for { KEYWORD_RETURN(FOR); }
	245	forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]	246	fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]	247	ftype { KEYWORD_RETURN(FTYPE); } // CFA
	248	_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]	249	goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]	250	if { KEYWORD_RETURN(IF); }
	251	_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
	252	__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
	253	__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
	254	inline { KEYWORD_RETURN(INLINE); } // C99
	255	__inline { KEYWORD_RETURN(INLINE); } // GCC
	256	__inline__ { KEYWORD_RETURN(INLINE); } // GCC
	257	int { KEYWORD_RETURN(INT); }
[201aeb9]	258	__int128 { KEYWORD_RETURN(INT128); } // GCC
	259	int128 { KEYWORD_RETURN(INT128); } // GCC
[b87a5ed]	260	__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]	261	long { KEYWORD_RETURN(LONG); }
[6016c87]	262	monitor { KEYWORD_RETURN(MONITOR); } // CFA
[a7c90d4]	263	mutex { KEYWORD_RETURN(MUTEX); } // CFA
[b87a5ed]	264	_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]	265	__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[3a2128f]	266	one_t { NUMERIC_RETURN(ONE_T); } // CFA
[ce28c7b]	267	or { QKEYWORD_RETURN(WOR); } // CFA
[4040425]	268	otype { KEYWORD_RETURN(OTYPE); } // CFA
[3848e0e]	269	register { KEYWORD_RETURN(REGISTER); }
[b87a5ed]	270	restrict { KEYWORD_RETURN(RESTRICT); } // C99
	271	__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
	272	__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]	273	return { KEYWORD_RETURN(RETURN); }
	274	short { KEYWORD_RETURN(SHORT); }
	275	signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]	276	__signed { KEYWORD_RETURN(SIGNED); } // GCC
	277	__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]	278	sizeof { KEYWORD_RETURN(SIZEOF); }
	279	static { KEYWORD_RETURN(STATIC); }
[b87a5ed]	280	_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[3848e0e]	281	struct { KEYWORD_RETURN(STRUCT); }
	282	switch { KEYWORD_RETURN(SWITCH); }
[bd4d011]	283	thread { KEYWORD_RETURN(THREAD); } // C11
[b87a5ed]	284	_Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11
	285	throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]	286	throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[5b2edbc]	287	timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
[4040425]	288	trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]	289	try { KEYWORD_RETURN(TRY); } // CFA
[8f60f0b]	290	ttype { KEYWORD_RETURN(TTYPE); } // CFA
[3848e0e]	291	typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]	292	typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	293	__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
	294	__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[3848e0e]	295	union { KEYWORD_RETURN(UNION); }
	296	unsigned { KEYWORD_RETURN(UNSIGNED); }
[90c3b1c]	297	__builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC
[72457b6]	298	virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
[3848e0e]	299	void { KEYWORD_RETURN(VOID); }
	300	volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]	301	__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
	302	__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[5b2edbc]	303	waitfor { KEYWORD_RETURN(WAITFOR); }
	304	when { KEYWORD_RETURN(WHEN); }
[3848e0e]	305	while { KEYWORD_RETURN(WHILE); }
[8b47e50]	306	with { KEYWORD_RETURN(WITH); } // CFA
[3a2128f]	307	zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
[51b73452]	308
[b87a5ed]	309	/* identifier */
	310	{identifier} { IDENTIFIER_RETURN(); }
[7e419e7]	311	"`"{identifier}"`" { // CFA
	312	yytext[yyleng - 1] = '\0'; yytext += 1; // SKULLDUGGERY: remove backquotes (ok to shorten?)
[dc7db63]	313	IDENTIFIER_RETURN();
	314	}
[b87a5ed]	315	{attr_identifier} { ATTRIBUTE_RETURN(); }
[51b73452]	316
[b87a5ed]	317	/* numeric constants */
[0a2168f]	318	{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
[59db689]	319	{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
[0a2168f]	320	{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
[59db689]	321	{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[930f69e]	322	{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
	323	{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
[3848e0e]	324	{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
	325	{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b73452]	326
[b87a5ed]	327	/* character constant, allows empty value */
[9ed4f94]	328	({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	329	<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
[dc7db63]	330	<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[930f69e]	331	/* ' stop editor highlighting */
[51b73452]	332
[b87a5ed]	333	/* string constant */
[9ed4f94]	334	({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]	335	<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
[dc7db63]	336	<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[930f69e]	337	/* " stop editor highlighting */
[51b73452]	338
[59db689]	339	/* common character/string constant */
[c1c1112]	340	<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]	341	<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]	342	<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]	343
[b87a5ed]	344	/* punctuation */
[615a096]	345	"@" { ASCIIOP_RETURN(); }
[dc7db63]	346	"`" { ASCIIOP_RETURN(); }
[b87a5ed]	347	"[" { ASCIIOP_RETURN(); }
	348	"]" { ASCIIOP_RETURN(); }
	349	"(" { ASCIIOP_RETURN(); }
	350	")" { ASCIIOP_RETURN(); }
	351	"{" { ASCIIOP_RETURN(); }
	352	"}" { ASCIIOP_RETURN(); }
	353	"," { ASCIIOP_RETURN(); } // also operator
	354	":" { ASCIIOP_RETURN(); }
	355	";" { ASCIIOP_RETURN(); }
	356	"." { ASCIIOP_RETURN(); } // also operator
[3848e0e]	357	"..." { NAMEDOP_RETURN(ELLIPSIS); }
	358
[b87a5ed]	359	/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]	360	"<:" { RETURN_VAL('['); }
	361	":>" { RETURN_VAL(']'); }
	362	"<%" { RETURN_VAL('{'); }
	363	"%>" { RETURN_VAL('}'); }
[51b73452]	364
[b87a5ed]	365	/* operators */
	366	"!" { ASCIIOP_RETURN(); }
	367	"+" { ASCIIOP_RETURN(); }
	368	"-" { ASCIIOP_RETURN(); }
	369	"*" { ASCIIOP_RETURN(); }
[e5f2a67]	370	"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
[b87a5ed]	371	"/" { ASCIIOP_RETURN(); }
	372	"%" { ASCIIOP_RETURN(); }
	373	"^" { ASCIIOP_RETURN(); }
	374	"~" { ASCIIOP_RETURN(); }
	375	"&" { ASCIIOP_RETURN(); }
	376	"\|" { ASCIIOP_RETURN(); }
	377	"<" { ASCIIOP_RETURN(); }
	378	">" { ASCIIOP_RETURN(); }
	379	"=" { ASCIIOP_RETURN(); }
	380	"?" { ASCIIOP_RETURN(); }
[3848e0e]	381
	382	"++" { NAMEDOP_RETURN(ICR); }
	383	"--" { NAMEDOP_RETURN(DECR); }
	384	"==" { NAMEDOP_RETURN(EQ); }
	385	"!=" { NAMEDOP_RETURN(NE); }
	386	"<<" { NAMEDOP_RETURN(LS); }
	387	">>" { NAMEDOP_RETURN(RS); }
	388	"<=" { NAMEDOP_RETURN(LE); }
	389	">=" { NAMEDOP_RETURN(GE); }
	390	"&&" { NAMEDOP_RETURN(ANDAND); }
	391	"\|\|" { NAMEDOP_RETURN(OROR); }
	392	"->" { NAMEDOP_RETURN(ARROW); }
	393	"+=" { NAMEDOP_RETURN(PLUSassign); }
	394	"-=" { NAMEDOP_RETURN(MINUSassign); }
[e5f2a67]	395	"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
[3848e0e]	396	"*=" { NAMEDOP_RETURN(MULTassign); }
	397	"/=" { NAMEDOP_RETURN(DIVassign); }
	398	"%=" { NAMEDOP_RETURN(MODassign); }
	399	"&=" { NAMEDOP_RETURN(ANDassign); }
	400	"\|=" { NAMEDOP_RETURN(ORassign); }
	401	"^=" { NAMEDOP_RETURN(ERassign); }
	402	"<<=" { NAMEDOP_RETURN(LSassign); }
	403	">>=" { NAMEDOP_RETURN(RSassign); }
[51b73452]	404
[08061589]	405	"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[097e2b0]	406
[b87a5ed]	407	/* CFA, operator identifier */
	408	{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]	409	"?"({op_unary_pre_post}\|"()"\|"[?]"\|"{}") { IDENTIFIER_RETURN(); }
[76c62b2]	410	"^?{}" { IDENTIFIER_RETURN(); }
[7e419e7]	411	"?`"{identifier} { IDENTIFIER_RETURN(); } // postfix operator
[b87a5ed]	412	"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b73452]	413	/*
[daf9671]	414	This rule handles ambiguous cases with operator identifiers, e.g., "int ??()", where the string "??" can be
	415	lexed as "?"/"?" or ""/"??". Since it is common practise to put a unary operator juxtaposed to an identifier,
	416	e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
	417	a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
	418	reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
	419	identifier to disambiguate this common case.
	420
	421	A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
	422	occurs when the deference operator has no parameters, ?() and ?()(...), requiring arbitrary whitespace
	423	look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
	424	parameter/argument to dereference ?(...). Hence, always interpreting the string ?() as * ?() does not preclude
	425	any meaningful program.
	426
	427	The remaining cases are with the increment/decrement operators and conditional expression:
	428
	429	i++? ...(...);
	430	i?++ ...(...);
	431
	432	requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
	433	incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
	434	space:
	435
	436	i++ ? i : 0;
	437	i? ++i : 0;
[51b73452]	438	*/
[daf9671]	439	{op_unary}"?"({op_unary_pre_post}\|"()"\|"[?]"\|{op_binary_over}"?") {
[b87a5ed]	440	// 1 or 2 character unary operator ?
	441	int i = yytext[1] == '?' ? 1 : 2;
	442	yyless( i ); // put back characters up to first '?'
	443	if ( i > 1 ) {
	444	NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
	445	} else {
	446	ASCIIOP_RETURN();
	447	} // if
	448	}
	449
[9ed4f94]	450	/* unknown character */
	451	. { yyerror( "unknown character" ); }
[51b73452]	452
	453	%%
[8551b859]	454
[9ed4f94]	455	// ----end of lexer----
	456
	457	void yyerror( const char * errmsg ) {
[8551b859]	458	SemanticErrorThrow = true;
[9ed4f94]	459	cout << (yyfilename ? yyfilename : "unknown file") << ':' << yylineno << ':' << column - yyleng + 1
[a16764a6]	460	<< ": " << ErrorHelpers::error_str() << errmsg << " at token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
[9ed4f94]	461	}
[51b73452]	462
[b87a5ed]	463	// Local Variables: //
	464	// mode: c++ //
[de62360d]	465	// tab-width: 4 //
[b87a5ed]	466	// compile-command: "make install" //
	467	// End: //

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