source: src/Parser/lex.ll@ fbe3f03

Last change on this file since fbe3f03 was 647e2ea, checked in by Peter A. Buhr <pabuhr@…>, 19 months ago

try @@(...) for attributes, rename and reorder grammar rules, remove apparently unnecessary push/pop rules, first attempt at [] => [void] return type
  • Property mode set to 100644
File size: 21.0 KB
RevLine 
[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
[647e2ea]12 * Last Modified On : Sat Feb 24 11:47:24 2024
13 * Update Count : 777
[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
[bb7422a]25// *************************** Includes and Defines ****************************
[51b73452]26
[0bd46fd]27#ifdef __clang__
28#pragma GCC diagnostic ignored "-Wnull-conversion"
29#endif
30
[4439008]31// trigger before each matching rule's action
32#define YY_USER_ACTION \
33 yylloc.first_line = yylineno; \
34 yylloc.first_column = column; \
35 column += yyleng; \
36 yylloc.last_column = column; \
37 yylloc.last_line = yylineno; \
38 yylloc.filename = yyfilename ? yyfilename : "";
[9ed4f94]39unsigned int column = 0; // position of the end of the last token parsed
40
[51b73452]41#include <string>
[f487962]42#include <cstdio> // FILENAME_MAX
[9ed4f94]43using namespace std;
[51b73452]44
[ba01b14]45#include "config.h" // configure info
[c468150]46#include "DeclarationNode.h" // for DeclarationNode
47#include "ExpressionNode.h" // for LabelNode
48#include "InitializerNode.h" // for InitializerNode
[984dce6]49#include "ParseNode.h"
[c468150]50#include "ParserTypes.h" // for Token
51#include "StatementNode.h" // for CondCtl, ForCtrl
[984dce6]52#include "TypedefTable.h"
[c468150]53// This (generated) header must come late as it is missing includes.
54#include "parser.hh" // generated info
[51b73452]55
[60a8062]56string * build_postfix_name( string * name );
57
[51b73452]58char *yyfilename;
[9ed4f94]59string *strtext; // accumulate parts of character and string constant value
[51b73452]60
[de62360d]61#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
[9ed4f94]62#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
[926af74]63#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
[de62360d]64#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
[5f2f2d7]65
[f487962]66#define WHITE_RETURN(x) // do nothing
[9ed4f94]67#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
[de62360d]68#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
[f487962]69#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
[de62360d]70#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
71#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
[4439008]72#define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword
[984dce6]73#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
[51b73452]74
[25744d2]75#ifdef HAVE_KEYWORDS_FLOATXX // GCC >= 7 => keyword, otherwise typedef
[ba01b14]76#define FLOATXX(v) KEYWORD_RETURN(v);
77#else
[37cdd97]78#define FLOATXX(v) IDENTIFIER_RETURN();
[ba01b14]79#endif // HAVE_KEYWORDS_FLOATXX
80
[3848e0e]81void rm_underscore() {
[7e419e7]82 // SKULLDUGGERY: remove underscores (ok to shorten?)
[e7aed49]83 yyleng = 0;
[7e419e7]84 for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string
[b87a5ed]85 if ( yytext[i] != '_' ) {
[e7aed49]86 yytext[yyleng] = yytext[i];
87 yyleng += 1;
[b87a5ed]88 } // if
89 } // for
90 yytext[yyleng] = '\0';
[7e419e7]91} // rm_underscore
[51b73452]92
[7812f1d1]93// Stop warning due to incorrectly generated flex code.
94#pragma GCC diagnostic ignored "-Wsign-compare"
[51b73452]95%}
96
[0a2168f]97binary [0-1]
[51b73452]98octal [0-7]
99nonzero [1-9]
100decimal [0-9]
101hex [0-9a-fA-F]
[3848e0e]102universal_char "\\"((u"_"?{hex_quad})|(U"_"?{hex_quad}{2}))
[51b73452]103
[b87a5ed]104 // identifier, GCC: $ in identifier
[51b73452]105identifier ([a-zA-Z_$]|{universal_char})([0-9a-zA-Z_$]|{universal_char})*
106
[b87a5ed]107 // numeric constants, CFA: '_' in constant
[3848e0e]108hex_quad {hex}("_"?{hex}){3}
[201aeb9]109size_opt (8|16|32|64|128)?
[0a616e0]110 // CFA: explicit l8/l16/l32/l64/l128, char 'hh', short 'h', int 'n'
[f56c32e]111length ("ll"|"LL"|[lL]{size_opt})|("hh"|"HH"|[hHnN])
[0a616e0]112 // CFA: size_t 'z', pointer 'p', which define a sign and length
113integer_suffix_opt ("_"?(([uU]({length}?[iI]?)|([iI]{length}))|([iI]({length}?[uU]?)|([uU]{length}))|({length}([iI]?[uU]?)|([uU][iI]))|[zZ]|[pP]))?
[51b73452]114
115octal_digits ({octal})|({octal}({octal}|"_")*{octal})
116octal_prefix "0""_"?
[930f69e]117octal_constant (("0")|({octal_prefix}{octal_digits})){integer_suffix_opt}
[51b73452]118
119nonzero_digits ({nonzero})|({nonzero}({decimal}|"_")*{decimal})
[930f69e]120decimal_constant {nonzero_digits}{integer_suffix_opt}
[51b73452]121
[0a2168f]122binary_digits ({binary})|({binary}({binary}|"_")*{binary})
123binary_prefix "0"[bB]"_"?
124binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt}
125
[51b73452]126hex_digits ({hex})|({hex}({hex}|"_")*{hex})
127hex_prefix "0"[xX]"_"?
[930f69e]128hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
[51b73452]129
[d3b5a14]130 // GCC: floating D (double), imaginary iI, and decimal floating DF, DD, DL
[51b73452]131exponent "_"?[eE]"_"?[+-]?{decimal_digits}
[ba01b14]132floating_size 16|32|32x|64|64x|80|128|128x
133floating_length ([fFdDlLwWqQ]|[fF]{floating_size})
[201aeb9]134floating_suffix ({floating_length}?[iI]?)|([iI]{floating_length})
[d3b5a14]135decimal_floating_suffix [dD][fFdDlL]
136floating_suffix_opt ("_"?({floating_suffix}|{decimal_floating_suffix}))?
[f4b77f2]137decimal_digits ({decimal})|({decimal}({decimal}|"_")*{decimal})
[930f69e]138floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
139floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
140floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})|({decimal_digits}{floating_fraction})
[51b73452]141
142binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
[dc7db63]143hex_floating_suffix_opt ("_"?({floating_suffix}))?
[930f69e]144hex_floating_fraction ({hex_digits}?"."{hex_digits})|({hex_digits}".")
[f4b77f2]145hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
[51b73452]146
[b87a5ed]147 // character escape sequence, GCC: \e => esc character
[51b73452]148simple_escape "\\"[abefnrtv'"?\\]
[930f69e]149 // ' stop editor highlighting
[3848e0e]150octal_escape "\\"{octal}("_"?{octal}){0,2}
151hex_escape "\\""x""_"?{hex_digits}
[51b73452]152escape_seq {simple_escape}|{octal_escape}|{hex_escape}|{universal_char}
[59db689]153cwide_prefix "L"|"U"|"u"
154swide_prefix {cwide_prefix}|"u8"
[51b73452]155
[b87a5ed]156 // display/white-space characters
[51b73452]157h_tab [\011]
158form_feed [\014]
159v_tab [\013]
160c_return [\015]
161h_white [ ]|{h_tab}
162
[e7aed49]163 // overloadable operators
[51b73452]164op_unary_only "~"|"!"
165op_unary_binary "+"|"-"|"*"
166op_unary_pre_post "++"|"--"
167op_unary {op_unary_only}|{op_unary_binary}|{op_unary_pre_post}
168
[994d080]169op_binary_only "/"|"%"|"\\"|"^"|"&"|"|"|"<"|">"|"="|"=="|"!="|"<<"|">>"|"<="|">="|"+="|"-="|"*="|"/="|"%="|"\\="|"&="|"|="|"^="|"<<="|">>="
[51b73452]170op_binary_over {op_unary_binary}|{op_binary_only}
[e7aed49]171 // op_binary_not_over "?"|"->"|"."|"&&"|"||"|"@="
172 // operator {op_unary_pre_post}|{op_binary_over}|{op_binary_not_over}
[51b73452]173
174%x COMMENT
[3848e0e]175%x BKQUOTE
176%x QUOTE
177%x STRING
[51b73452]178
179%%
[994d080]180 /* line directives */
[4040425]181^{h_white}*"#"{h_white}*[0-9]+{h_white}*["][^"\n]+["].*"\n" {
[930f69e]182 /* " stop editor highlighting */
[c1c1112]183 static char filename[FILENAME_MAX]; // temporarily store current source-file name
[51b73452]184 char *end_num;
185 char *begin_string, *end_string;
186 long lineno, length;
187 lineno = strtol( yytext + 1, &end_num, 0 );
188 begin_string = strchr( end_num, '"' );
[f487962]189 if ( begin_string ) { // file name ?
190 end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
191 assert( end_string ); // closing quote ?
192 length = end_string - begin_string - 1; // file-name length without quotes or sentinel
193 assert( length < FILENAME_MAX ); // room for sentinel ?
194 memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
195 filename[ length ] = '\0'; // terminate string with sentinel
[9ed4f94]196 //cout << "file " << filename << " line " << lineno << endl;
[f487962]197 yylineno = lineno;
[c1c1112]198 yyfilename = filename;
[b87a5ed]199 } // if
[51b73452]200}
201
[637dd9c]202 /* preprocessor-style directives */
[61fc4f6]203^{h_white}*"#"[^\n]*"\n" { RETURN_VAL( DIRECTIVE ); }
[51b73452]204
[cd623a4]205 /* ignore C style comments (ALSO HANDLED BY CPP) */
[3848e0e]206"/*" { BEGIN COMMENT; }
[cd623a4]207<COMMENT>.|\n ;
208<COMMENT>"*/" { BEGIN 0; }
[51b73452]209
[cd623a4]210 /* ignore C++ style comments (ALSO HANDLED BY CPP) */
211"//"[^\n]*"\n" ;
[51b73452]212
[b87a5ed]213 /* ignore whitespace */
[3848e0e]214{h_white}+ { WHITE_RETURN(' '); }
215({v_tab}|{c_return}|{form_feed})+ { WHITE_RETURN(' '); }
216({h_white}|{v_tab}|{c_return}|{form_feed})*"\n" { NEWLINE_RETURN(); }
[51b73452]217
[b87a5ed]218 /* keywords */
[46f9f02]219alignas { KEYWORD_RETURN(ALIGNAS); } // CFA
[b87a5ed]220_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
[46f9f02]221alignof { KEYWORD_RETURN(ALIGNOF); } // CFA
[b87a5ed]222_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
223__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
224__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
[9fd9d015]225and { QKEYWORD_RETURN(WAND); } // CFA
[b87a5ed]226asm { KEYWORD_RETURN(ASM); }
227__asm { KEYWORD_RETURN(ASM); } // GCC
228__asm__ { KEYWORD_RETURN(ASM); } // GCC
229_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
230__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
231__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
[3848e0e]232auto { KEYWORD_RETURN(AUTO); }
[f673c13c]233__auto_type { KEYWORD_RETURN(AUTO_TYPE); }
[b6ad601]234basetypeof { KEYWORD_RETURN(BASETYPEOF); } // CFA
[b87a5ed]235_Bool { KEYWORD_RETURN(BOOL); } // C99
[3848e0e]236break { KEYWORD_RETURN(BREAK); }
237case { KEYWORD_RETURN(CASE); }
[9fb1367]238catch { QKEYWORD_RETURN(CATCH); } // CFA
239catchResume { QKEYWORD_RETURN(CATCHRESUME); } // CFA
[3848e0e]240char { KEYWORD_RETURN(CHAR); }
[b87a5ed]241choose { KEYWORD_RETURN(CHOOSE); } // CFA
[1528a2c]242coerce { KEYWORD_RETURN(COERCE); } // CFA
[11ab0b4a]243corun { KEYWORD_RETURN(CORUN); } // CFA
244cofor { KEYWORD_RETURN(COFOR); } // CFA
[b87a5ed]245_Complex { KEYWORD_RETURN(COMPLEX); } // C99
246__complex { KEYWORD_RETURN(COMPLEX); } // GCC
247__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
[3848e0e]248const { KEYWORD_RETURN(CONST); }
[b87a5ed]249__const { KEYWORD_RETURN(CONST); } // GCC
250__const__ { KEYWORD_RETURN(CONST); } // GCC
[3848e0e]251continue { KEYWORD_RETURN(CONTINUE); }
[e04b636]252coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
[15f769c]253_Decimal32 { KEYWORD_RETURN(DECIMAL32); } // GCC
254_Decimal64 { KEYWORD_RETURN(DECIMAL64); } // GCC
255_Decimal128 { KEYWORD_RETURN(DECIMAL128); } // GCC
[3848e0e]256default { KEYWORD_RETURN(DEFAULT); }
[02e5ab6]257disable { KEYWORD_RETURN(DISABLE); } // CFA
[b87a5ed]258do { KEYWORD_RETURN(DO); }
[3848e0e]259double { KEYWORD_RETURN(DOUBLE); }
[b87a5ed]260dtype { KEYWORD_RETURN(DTYPE); } // CFA
[3848e0e]261else { KEYWORD_RETURN(ELSE); }
[02e5ab6]262enable { KEYWORD_RETURN(ENABLE); } // CFA
[3848e0e]263enum { KEYWORD_RETURN(ENUM); }
[c27fb59]264exception { KEYWORD_RETURN(EXCEPTION); } // CFA
[8c25760]265__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
[3848e0e]266extern { KEYWORD_RETURN(EXTERN); }
[bd7f401]267fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
[35f730f]268fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
[9fb1367]269finally { QKEYWORD_RETURN(FINALLY); } // CFA
270fixup { QKEYWORD_RETURN(FIXUP); } // CFA
[3848e0e]271float { KEYWORD_RETURN(FLOAT); }
[e15853c]272__float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
273float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
274__float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
275float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
276_Float16 { FLOATXX(uFLOAT16); } // GCC
277_Float32 { FLOATXX(uFLOAT32); } // GCC
278_Float32x { FLOATXX(uFLOAT32X); } // GCC
279_Float64 { FLOATXX(uFLOAT64); } // GCC
280_Float64x { FLOATXX(uFLOAT64X); } // GCC
281_Float128 { FLOATXX(uFLOAT128); } // GCC
282_Float128x { FLOATXX(uFLOAT128); } // GCC
[b87a5ed]283for { KEYWORD_RETURN(FOR); }
284forall { KEYWORD_RETURN(FORALL); } // CFA
[3848e0e]285fortran { KEYWORD_RETURN(FORTRAN); }
[b87a5ed]286ftype { KEYWORD_RETURN(FTYPE); } // CFA
[553772b]287generator { KEYWORD_RETURN(GENERATOR); } // CFA
[b87a5ed]288_Generic { KEYWORD_RETURN(GENERIC); } // C11
[3848e0e]289goto { KEYWORD_RETURN(GOTO); }
[b87a5ed]290if { KEYWORD_RETURN(IF); }
291_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
292__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
293__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
294inline { KEYWORD_RETURN(INLINE); } // C99
295__inline { KEYWORD_RETURN(INLINE); } // GCC
296__inline__ { KEYWORD_RETURN(INLINE); } // GCC
297int { KEYWORD_RETURN(INT); }
[f1da02c]298int128 { KEYWORD_RETURN(INT128); } // CFA
[201aeb9]299__int128 { KEYWORD_RETURN(INT128); } // GCC
[f1da02c]300__int128_t { KEYWORD_RETURN(INT128); } // GCC
[b87a5ed]301__label__ { KEYWORD_RETURN(LABEL); } // GCC
[3848e0e]302long { KEYWORD_RETURN(LONG); }
[6016c87]303monitor { KEYWORD_RETURN(MONITOR); } // CFA
[a7c90d4]304mutex { KEYWORD_RETURN(MUTEX); } // CFA
[b87a5ed]305_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
[5721a6d]306__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
[3a2128f]307one_t { NUMERIC_RETURN(ONE_T); } // CFA
[ce28c7b]308or { QKEYWORD_RETURN(WOR); } // CFA
[4040425]309otype { KEYWORD_RETURN(OTYPE); } // CFA
[9fb1367]310recover { QKEYWORD_RETURN(RECOVER); } // CFA
[3848e0e]311register { KEYWORD_RETURN(REGISTER); }
[9fb1367]312report { KEYWORD_RETURN(THROWRESUME); } // CFA
[b87a5ed]313restrict { KEYWORD_RETURN(RESTRICT); } // C99
314__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
315__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
[3848e0e]316return { KEYWORD_RETURN(RETURN); }
[25744d2]317 /* resume { KEYWORD_RETURN(RESUME); } // CFA */
[3848e0e]318short { KEYWORD_RETURN(SHORT); }
319signed { KEYWORD_RETURN(SIGNED); }
[b87a5ed]320__signed { KEYWORD_RETURN(SIGNED); } // GCC
321__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
[3848e0e]322sizeof { KEYWORD_RETURN(SIZEOF); }
323static { KEYWORD_RETURN(STATIC); }
[b87a5ed]324_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
[46f9f02]325static_assert { KEYWORD_RETURN(STATICASSERT); } // C23
[3848e0e]326struct { KEYWORD_RETURN(STRUCT); }
[37cdd97]327suspend { KEYWORD_RETURN(SUSPEND); } // CFA
[3848e0e]328switch { KEYWORD_RETURN(SWITCH); }
[bd4d011]329thread { KEYWORD_RETURN(THREAD); } // C11
[ed9a1ae]330__thread { KEYWORD_RETURN(THREADLOCALGCC); } // GCC
331_Thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C11
[46f9f02]332thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C23
[b87a5ed]333throw { KEYWORD_RETURN(THROW); } // CFA
[02e5ab6]334throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
[5b2edbc]335timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
[4040425]336trait { KEYWORD_RETURN(TRAIT); } // CFA
[b87a5ed]337try { KEYWORD_RETURN(TRY); } // CFA
[8f60f0b]338ttype { KEYWORD_RETURN(TTYPE); } // CFA
[3848e0e]339typedef { KEYWORD_RETURN(TYPEDEF); }
[b87a5ed]340typeof { KEYWORD_RETURN(TYPEOF); } // GCC
341__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
342__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
[1f652a7]343typeid { KEYWORD_RETURN(TYPEID); } // GCC
[3848e0e]344union { KEYWORD_RETURN(UNION); }
[f1da02c]345__uint128_t { KEYWORD_RETURN(UINT128); } // GCC
[3848e0e]346unsigned { KEYWORD_RETURN(UNSIGNED); }
[59c7e3e]347__builtin_va_arg { KEYWORD_RETURN(VA_ARG); } // GCC
348__builtin_va_list { KEYWORD_RETURN(VA_LIST); } // GCC
[72457b6]349virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
[3848e0e]350void { KEYWORD_RETURN(VOID); }
351volatile { KEYWORD_RETURN(VOLATILE); }
[b87a5ed]352__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
353__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
[1f652a7]354vtable { KEYWORD_RETURN(VTABLE); } // CFA
[9fb1367]355waitfor { KEYWORD_RETURN(WAITFOR); } // CFA
[466787a]356waituntil { KEYWORD_RETURN(WAITUNTIL); } // CFA
[9fb1367]357when { KEYWORD_RETURN(WHEN); } // CFA
[3848e0e]358while { KEYWORD_RETURN(WHILE); }
[8b47e50]359with { KEYWORD_RETURN(WITH); } // CFA
[3a2128f]360zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
[51b73452]361
[b87a5ed]362 /* identifier */
363{identifier} { IDENTIFIER_RETURN(); }
[095ac99]364"``"{identifier} { // CFA
365 yytext[yyleng] = '\0'; yytext += 2; // SKULLDUGGERY: remove backquotes (ok to shorten?)
[dc7db63]366 IDENTIFIER_RETURN();
367}
[51b73452]368
[b87a5ed]369 /* numeric constants */
[0a2168f]370{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
[59db689]371{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
[0a2168f]372{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
[59db689]373{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
[930f69e]374{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
375{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
[3848e0e]376{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
377{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
[51b73452]378
[b87a5ed]379 /* character constant, allows empty value */
[9ed4f94]380({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]381<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
[dc7db63]382<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
[930f69e]383 /* ' stop editor highlighting */
[51b73452]384
[b87a5ed]385 /* string constant */
[9ed4f94]386({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
[c1c1112]387<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
[dc7db63]388<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
[930f69e]389 /* " stop editor highlighting */
[51b73452]390
[59db689]391 /* common character/string constant */
[c1c1112]392<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
[cd623a4]393<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
[c1c1112]394<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
[3848e0e]395
[b87a5ed]396 /* punctuation */
[615a096]397"@" { ASCIIOP_RETURN(); }
[dc7db63]398"`" { ASCIIOP_RETURN(); }
[b87a5ed]399"[" { ASCIIOP_RETURN(); }
400"]" { ASCIIOP_RETURN(); }
401"(" { ASCIIOP_RETURN(); }
402")" { ASCIIOP_RETURN(); }
403"{" { ASCIIOP_RETURN(); }
404"}" { ASCIIOP_RETURN(); }
405"," { ASCIIOP_RETURN(); } // also operator
406":" { ASCIIOP_RETURN(); }
407";" { ASCIIOP_RETURN(); }
408"." { ASCIIOP_RETURN(); } // also operator
[647e2ea]409"@@" { NAMEDOP_RETURN(ATTR); } // CFA, attribute shorthand
[3848e0e]410"..." { NAMEDOP_RETURN(ELLIPSIS); }
411
[b87a5ed]412 /* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
[3848e0e]413"<:" { RETURN_VAL('['); }
414":>" { RETURN_VAL(']'); }
415"<%" { RETURN_VAL('{'); }
416"%>" { RETURN_VAL('}'); }
[51b73452]417
[b87a5ed]418 /* operators */
419"!" { ASCIIOP_RETURN(); }
420"+" { ASCIIOP_RETURN(); }
421"-" { ASCIIOP_RETURN(); }
422"*" { ASCIIOP_RETURN(); }
[e5f2a67]423"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
[b87a5ed]424"/" { ASCIIOP_RETURN(); }
425"%" { ASCIIOP_RETURN(); }
426"^" { ASCIIOP_RETURN(); }
427"~" { ASCIIOP_RETURN(); }
428"&" { ASCIIOP_RETURN(); }
429"|" { ASCIIOP_RETURN(); }
430"<" { ASCIIOP_RETURN(); }
431">" { ASCIIOP_RETURN(); }
432"=" { ASCIIOP_RETURN(); }
433"?" { ASCIIOP_RETURN(); }
[3848e0e]434
435"++" { NAMEDOP_RETURN(ICR); }
436"--" { NAMEDOP_RETURN(DECR); }
437"==" { NAMEDOP_RETURN(EQ); }
438"!=" { NAMEDOP_RETURN(NE); }
439"<<" { NAMEDOP_RETURN(LS); }
440">>" { NAMEDOP_RETURN(RS); }
441"<=" { NAMEDOP_RETURN(LE); }
442">=" { NAMEDOP_RETURN(GE); }
443"&&" { NAMEDOP_RETURN(ANDAND); }
444"||" { NAMEDOP_RETURN(OROR); }
445"->" { NAMEDOP_RETURN(ARROW); }
446"+=" { NAMEDOP_RETURN(PLUSassign); }
447"-=" { NAMEDOP_RETURN(MINUSassign); }
[e5f2a67]448"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
[3848e0e]449"*=" { NAMEDOP_RETURN(MULTassign); }
450"/=" { NAMEDOP_RETURN(DIVassign); }
451"%=" { NAMEDOP_RETURN(MODassign); }
452"&=" { NAMEDOP_RETURN(ANDassign); }
453"|=" { NAMEDOP_RETURN(ORassign); }
454"^=" { NAMEDOP_RETURN(ERassign); }
455"<<=" { NAMEDOP_RETURN(LSassign); }
456">>=" { NAMEDOP_RETURN(RSassign); }
[51b73452]457
[08061589]458"@=" { NAMEDOP_RETURN(ATassign); } // CFA
[d69f4bb4]459"~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
460"-~" { NAMEDOP_RETURN(ErangeDown); } // CFA
461"-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA
[097e2b0]462
[b87a5ed]463 /* CFA, operator identifier */
464{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
[a61fea9a]465"?"({op_unary_pre_post}|"()"|"[?]"|"{}") { IDENTIFIER_RETURN(); }
[76c62b2]466"^?{}" { IDENTIFIER_RETURN(); }
[60a8062]467"?`"{identifier} { // postfix operator
468 yylval.tok.str = new string( &yytext[2] ); // remove ?`
469 yylval.tok.str = build_postfix_name( yylval.tok.str ); // add prefix
470 RETURN_LOCN( typedefTable.isKind( *yylval.tok.str ) );
471}
[b87a5ed]472"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
[51b73452]473 /*
[daf9671]474 This rule handles ambiguous cases with operator identifiers, e.g., "int *?*?()", where the string "*?*?" can be
475 lexed as "*?"/"*?" or "*"/"?*?". Since it is common practise to put a unary operator juxtaposed to an identifier,
476 e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
477 a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
478 reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
479 identifier to disambiguate this common case.
480
481 A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
482 occurs when the deference operator has no parameters, *?() and *?()(...), requiring arbitrary whitespace
483 look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
484 parameter/argument to dereference *?(...). Hence, always interpreting the string *?() as * ?() does not preclude
485 any meaningful program.
486
487 The remaining cases are with the increment/decrement operators and conditional expression:
488
489 i++? ...(...);
490 i?++ ...(...);
491
492 requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
493 incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
494 space:
495
496 i++ ? i : 0;
497 i? ++i : 0;
[51b73452]498 */
[daf9671]499{op_unary}"?"({op_unary_pre_post}|"()"|"[?]"|{op_binary_over}"?") {
[b87a5ed]500 // 1 or 2 character unary operator ?
501 int i = yytext[1] == '?' ? 1 : 2;
502 yyless( i ); // put back characters up to first '?'
503 if ( i > 1 ) {
504 NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
505 } else {
506 ASCIIOP_RETURN();
507 } // if
508}
509
[9ed4f94]510 /* unknown character */
511. { yyerror( "unknown character" ); }
[51b73452]512
513%%
[8551b859]514
[9ed4f94]515// ----end of lexer----
516
517void yyerror( const char * errmsg ) {
[8551b859]518 SemanticErrorThrow = true;
[a8615fd1]519 cerr << (yyfilename ? yyfilename : "*unknown file*") << ':' << yylineno << ':' << column - yyleng + 1
[79a6b17]520 << ": " << ErrorHelpers::error_str() << errmsg << " before token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
[9ed4f94]521}
[51b73452]522
[b87a5ed]523// Local Variables: //
524// mode: c++ //
[de62360d]525// tab-width: 4 //
[b87a5ed]526// compile-command: "make install" //
527// End: //
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