source: src/Parser/lex.ll@ 044ae62

ADT
Last change on this file since 044ae62 was 044ae62, checked in by JiadaL <j82liang@…>, 2 years ago

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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.
6 *
7 * lex.ll --
8 *
9 * Author : Peter A. Buhr
10 * Created On : Sat Sep 22 08:58:10 2001
11 * Last Modified By : Peter A. Buhr
12 * Last Modified On : Tue May 2 08:45:21 2023
13 * Update Count : 769
14 */
15
16%option yylineno
17%option noyywrap
18%option nounput
19
20%{
21// The lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive have been
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.
24
25// *************************** Includes and Defines ****************************
26
27#ifdef __clang__
28#pragma GCC diagnostic ignored "-Wnull-conversion"
29#endif
30
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 : "";
39unsigned int column = 0; // position of the end of the last token parsed
40
41#include <string>
42#include <cstdio> // FILENAME_MAX
43using namespace std;
44
45#include "config.h" // configure info
46#include "DeclarationNode.h" // for DeclarationNode
47#include "ExpressionNode.h" // for LabelNode
48#include "InitializerNode.h" // for InitializerNode
49#include "ParseNode.h"
50#include "ParserTypes.h" // for Token
51#include "StatementNode.h" // for CondCtl, ForCtrl
52#include "TypedefTable.h"
53// This (generated) header must come late as it is missing includes.
54#include "parser.hh" // generated info
55
56string * build_postfix_name( string * name );
57
58char *yyfilename;
59string *strtext; // accumulate parts of character and string constant value
60
61#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
62#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
63#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
64#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
65
66#define WHITE_RETURN(x) // do nothing
67#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
68#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
69#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
70#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
71#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
72#define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword
73#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
74
75#ifdef HAVE_KEYWORDS_FLOATXX // GCC >= 7 => keyword, otherwise typedef
76#define FLOATXX(v) KEYWORD_RETURN(v);
77#else
78#define FLOATXX(v) IDENTIFIER_RETURN();
79#endif // HAVE_KEYWORDS_FLOATXX
80
81void rm_underscore() {
82 // SKULLDUGGERY: remove underscores (ok to shorten?)
83 yyleng = 0;
84 for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string
85 if ( yytext[i] != '_' ) {
86 yytext[yyleng] = yytext[i];
87 yyleng += 1;
88 } // if
89 } // for
90 yytext[yyleng] = '\0';
91} // rm_underscore
92
93// Stop warning due to incorrectly generated flex code.
94#pragma GCC diagnostic ignored "-Wsign-compare"
95%}
96
97binary [0-1]
98octal [0-7]
99nonzero [1-9]
100decimal [0-9]
101hex [0-9a-fA-F]
102universal_char "\\"((u"_"?{hex_quad})|(U"_"?{hex_quad}{2}))
103
104 // identifier, GCC: $ in identifier
105identifier ([a-zA-Z_$]|{universal_char})([0-9a-zA-Z_$]|{universal_char})*
106
107 // numeric constants, CFA: '_' in constant
108hex_quad {hex}("_"?{hex}){3}
109size_opt (8|16|32|64|128)?
110 // CFA: explicit l8/l16/l32/l64/l128, char 'hh', short 'h', int 'n'
111length ("ll"|"LL"|[lL]{size_opt})|("hh"|"HH"|[hHnN])
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]))?
114
115octal_digits ({octal})|({octal}({octal}|"_")*{octal})
116octal_prefix "0""_"?
117octal_constant (("0")|({octal_prefix}{octal_digits})){integer_suffix_opt}
118
119nonzero_digits ({nonzero})|({nonzero}({decimal}|"_")*{decimal})
120decimal_constant {nonzero_digits}{integer_suffix_opt}
121
122binary_digits ({binary})|({binary}({binary}|"_")*{binary})
123binary_prefix "0"[bB]"_"?
124binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt}
125
126hex_digits ({hex})|({hex}({hex}|"_")*{hex})
127hex_prefix "0"[xX]"_"?
128hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
129
130 // GCC: floating D (double), imaginary iI, and decimal floating DF, DD, DL
131exponent "_"?[eE]"_"?[+-]?{decimal_digits}
132floating_size 16|32|32x|64|64x|80|128|128x
133floating_length ([fFdDlLwWqQ]|[fF]{floating_size})
134floating_suffix ({floating_length}?[iI]?)|([iI]{floating_length})
135decimal_floating_suffix [dD][fFdDlL]
136floating_suffix_opt ("_"?({floating_suffix}|{decimal_floating_suffix}))?
137decimal_digits ({decimal})|({decimal}({decimal}|"_")*{decimal})
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})
141
142binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
143hex_floating_suffix_opt ("_"?({floating_suffix}))?
144hex_floating_fraction ({hex_digits}?"."{hex_digits})|({hex_digits}".")
145hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
146
147 // character escape sequence, GCC: \e => esc character
148simple_escape "\\"[abefnrtv'"?\\]
149 // ' stop editor highlighting
150octal_escape "\\"{octal}("_"?{octal}){0,2}
151hex_escape "\\""x""_"?{hex_digits}
152escape_seq {simple_escape}|{octal_escape}|{hex_escape}|{universal_char}
153cwide_prefix "L"|"U"|"u"
154swide_prefix {cwide_prefix}|"u8"
155
156 // display/white-space characters
157h_tab [\011]
158form_feed [\014]
159v_tab [\013]
160c_return [\015]
161h_white [ ]|{h_tab}
162
163 // overloadable operators
164op_unary_only "~"|"!"
165op_unary_binary "+"|"-"|"*"
166op_unary_pre_post "++"|"--"
167op_unary {op_unary_only}|{op_unary_binary}|{op_unary_pre_post}
168
169op_binary_only "/"|"%"|"\\"|"^"|"&"|"|"|"<"|">"|"="|"=="|"!="|"<<"|">>"|"<="|">="|"+="|"-="|"*="|"/="|"%="|"\\="|"&="|"|="|"^="|"<<="|">>="
170op_binary_over {op_unary_binary}|{op_binary_only}
171 // op_binary_not_over "?"|"->"|"."|"&&"|"||"|"@="
172 // operator {op_unary_pre_post}|{op_binary_over}|{op_binary_not_over}
173
174%x COMMENT
175%x BKQUOTE
176%x QUOTE
177%x STRING
178
179%%
180 /* line directives */
181^{h_white}*"#"{h_white}*[0-9]+{h_white}*["][^"\n]+["].*"\n" {
182 /* " stop editor highlighting */
183 static char filename[FILENAME_MAX]; // temporarily store current source-file name
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, '"' );
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
196 //cout << "file " << filename << " line " << lineno << endl;
197 yylineno = lineno;
198 yyfilename = filename;
199 } // if
200}
201
202 /* preprocessor-style directives */
203^{h_white}*"#"[^\n]*"\n" { RETURN_VAL( DIRECTIVE ); }
204
205 /* ignore C style comments (ALSO HANDLED BY CPP) */
206"/*" { BEGIN COMMENT; }
207<COMMENT>.|\n ;
208<COMMENT>"*/" { BEGIN 0; }
209
210 /* ignore C++ style comments (ALSO HANDLED BY CPP) */
211"//"[^\n]*"\n" ;
212
213 /* ignore whitespace */
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(); }
217
218 /* keywords */
219_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
220_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
221__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
222__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
223and { QKEYWORD_RETURN(WAND); } // CFA
224asm { KEYWORD_RETURN(ASM); }
225__asm { KEYWORD_RETURN(ASM); } // GCC
226__asm__ { KEYWORD_RETURN(ASM); } // GCC
227_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
228__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
229__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
230auto { KEYWORD_RETURN(AUTO); }
231__auto_type { KEYWORD_RETURN(AUTO_TYPE); }
232basetypeof { KEYWORD_RETURN(BASETYPEOF); } // CFA
233_Bool { KEYWORD_RETURN(BOOL); } // C99
234break { KEYWORD_RETURN(BREAK); }
235case { KEYWORD_RETURN(CASE); }
236catch { QKEYWORD_RETURN(CATCH); } // CFA
237catchResume { QKEYWORD_RETURN(CATCHRESUME); } // CFA
238char { KEYWORD_RETURN(CHAR); }
239choose { KEYWORD_RETURN(CHOOSE); } // CFA
240coerce { KEYWORD_RETURN(COERCE); } // CFA
241_Complex { KEYWORD_RETURN(COMPLEX); } // C99
242__complex { KEYWORD_RETURN(COMPLEX); } // GCC
243__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
244const { KEYWORD_RETURN(CONST); }
245__const { KEYWORD_RETURN(CONST); } // GCC
246__const__ { KEYWORD_RETURN(CONST); } // GCC
247continue { KEYWORD_RETURN(CONTINUE); }
248coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
249_Decimal32 { KEYWORD_RETURN(DECIMAL32); } // GCC
250_Decimal64 { KEYWORD_RETURN(DECIMAL64); } // GCC
251_Decimal128 { KEYWORD_RETURN(DECIMAL128); } // GCC
252default { KEYWORD_RETURN(DEFAULT); }
253disable { KEYWORD_RETURN(DISABLE); } // CFA
254do { KEYWORD_RETURN(DO); }
255double { KEYWORD_RETURN(DOUBLE); }
256dtype { KEYWORD_RETURN(DTYPE); } // CFA
257else { KEYWORD_RETURN(ELSE); }
258enable { KEYWORD_RETURN(ENABLE); } // CFA
259enum { KEYWORD_RETURN(ENUM); }
260exception { KEYWORD_RETURN(EXCEPTION); } // CFA
261__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
262extern { KEYWORD_RETURN(EXTERN); }
263fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
264fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
265finally { QKEYWORD_RETURN(FINALLY); } // CFA
266fixup { QKEYWORD_RETURN(FIXUP); } // CFA
267float { KEYWORD_RETURN(FLOAT); }
268__float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
269float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
270__float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
271float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
272_Float16 { FLOATXX(uFLOAT16); } // GCC
273_Float32 { FLOATXX(uFLOAT32); } // GCC
274_Float32x { FLOATXX(uFLOAT32X); } // GCC
275_Float64 { FLOATXX(uFLOAT64); } // GCC
276_Float64x { FLOATXX(uFLOAT64X); } // GCC
277_Float128 { FLOATXX(uFLOAT128); } // GCC
278_Float128x { FLOATXX(uFLOAT128); } // GCC
279for { KEYWORD_RETURN(FOR); }
280forall { KEYWORD_RETURN(FORALL); } // CFA
281fortran { KEYWORD_RETURN(FORTRAN); }
282ftype { KEYWORD_RETURN(FTYPE); } // CFA
283generator { KEYWORD_RETURN(GENERATOR); } // CFA
284_Generic { KEYWORD_RETURN(GENERIC); } // C11
285goto { KEYWORD_RETURN(GOTO); }
286if { KEYWORD_RETURN(IF); }
287_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
288__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
289__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
290inline { KEYWORD_RETURN(INLINE); } // C99
291__inline { KEYWORD_RETURN(INLINE); } // GCC
292__inline__ { KEYWORD_RETURN(INLINE); } // GCC
293int { KEYWORD_RETURN(INT); }
294int128 { KEYWORD_RETURN(INT128); } // CFA
295__int128 { KEYWORD_RETURN(INT128); } // GCC
296__int128_t { KEYWORD_RETURN(INT128); } // GCC
297__label__ { KEYWORD_RETURN(LABEL); } // GCC
298long { KEYWORD_RETURN(LONG); }
299monitor { KEYWORD_RETURN(MONITOR); } // CFA
300mutex { KEYWORD_RETURN(MUTEX); } // CFA
301_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
302__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
303one_t { NUMERIC_RETURN(ONE_T); } // CFA
304or { QKEYWORD_RETURN(WOR); } // CFA
305otype { KEYWORD_RETURN(OTYPE); } // CFA
306recover { QKEYWORD_RETURN(RECOVER); } // CFA
307register { KEYWORD_RETURN(REGISTER); }
308report { KEYWORD_RETURN(THROWRESUME); } // CFA
309restrict { KEYWORD_RETURN(RESTRICT); } // C99
310__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
311__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
312return { KEYWORD_RETURN(RETURN); }
313 /* resume { KEYWORD_RETURN(RESUME); } // CFA */
314short { KEYWORD_RETURN(SHORT); }
315signed { KEYWORD_RETURN(SIGNED); }
316__signed { KEYWORD_RETURN(SIGNED); } // GCC
317__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
318sizeof { KEYWORD_RETURN(SIZEOF); }
319static { KEYWORD_RETURN(STATIC); }
320_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
321struct { KEYWORD_RETURN(STRUCT); }
322suspend { KEYWORD_RETURN(SUSPEND); } // CFA
323switch { KEYWORD_RETURN(SWITCH); }
324thread { KEYWORD_RETURN(THREAD); } // C11
325__thread { KEYWORD_RETURN(THREADLOCALGCC); } // GCC
326_Thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C11
327throw { KEYWORD_RETURN(THROW); } // CFA
328throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
329timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
330trait { KEYWORD_RETURN(TRAIT); } // CFA
331try { KEYWORD_RETURN(TRY); } // CFA
332ttype { KEYWORD_RETURN(TTYPE); } // CFA
333typedef { KEYWORD_RETURN(TYPEDEF); }
334typeof { KEYWORD_RETURN(TYPEOF); } // GCC
335__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
336__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
337typeid { KEYWORD_RETURN(TYPEID); } // GCC
338union { KEYWORD_RETURN(UNION); }
339__uint128_t { KEYWORD_RETURN(UINT128); } // GCC
340unsigned { KEYWORD_RETURN(UNSIGNED); }
341__builtin_va_arg { KEYWORD_RETURN(VA_ARG); } // GCC
342__builtin_va_list { KEYWORD_RETURN(VA_LIST); } // GCC
343virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
344void { KEYWORD_RETURN(VOID); }
345volatile { KEYWORD_RETURN(VOLATILE); }
346__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
347__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
348vtable { KEYWORD_RETURN(VTABLE); } // CFA
349waitfor { KEYWORD_RETURN(WAITFOR); } // CFA
350waituntil { KEYWORD_RETURN(WAITUNTIL); } // CFA
351when { KEYWORD_RETURN(WHEN); } // CFA
352while { KEYWORD_RETURN(WHILE); }
353with { KEYWORD_RETURN(WITH); } // CFA
354zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
355_DATA_ { KEYWORD_RETURN(DATA); } // Experimental
356
357 /* identifier */
358{identifier} { IDENTIFIER_RETURN(); }
359"``"{identifier} { // CFA
360 yytext[yyleng] = '\0'; yytext += 2; // SKULLDUGGERY: remove backquotes (ok to shorten?)
361 IDENTIFIER_RETURN();
362}
363
364 /* numeric constants */
365{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
366{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
367{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
368{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
369{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
370{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
371{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
372{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
373
374 /* character constant, allows empty value */
375({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
376<QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); }
377<QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
378 /* ' stop editor highlighting */
379
380 /* string constant */
381({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
382<STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); }
383<STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
384 /* " stop editor highlighting */
385
386 /* common character/string constant */
387<QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
388<QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
389<QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
390
391 /* punctuation */
392"@" { ASCIIOP_RETURN(); }
393"`" { ASCIIOP_RETURN(); }
394"[" { ASCIIOP_RETURN(); }
395"]" { ASCIIOP_RETURN(); }
396"(" { ASCIIOP_RETURN(); }
397")" { ASCIIOP_RETURN(); }
398"{" { ASCIIOP_RETURN(); }
399"}" { ASCIIOP_RETURN(); }
400"," { ASCIIOP_RETURN(); } // also operator
401":" { ASCIIOP_RETURN(); }
402";" { ASCIIOP_RETURN(); }
403"." { ASCIIOP_RETURN(); } // also operator
404"..." { NAMEDOP_RETURN(ELLIPSIS); }
405
406 /* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
407"<:" { RETURN_VAL('['); }
408":>" { RETURN_VAL(']'); }
409"<%" { RETURN_VAL('{'); }
410"%>" { RETURN_VAL('}'); }
411
412 /* operators */
413"!" { ASCIIOP_RETURN(); }
414"+" { ASCIIOP_RETURN(); }
415"-" { ASCIIOP_RETURN(); }
416"*" { ASCIIOP_RETURN(); }
417"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
418"/" { ASCIIOP_RETURN(); }
419"%" { ASCIIOP_RETURN(); }
420"^" { ASCIIOP_RETURN(); }
421"~" { ASCIIOP_RETURN(); }
422"&" { ASCIIOP_RETURN(); }
423"|" { ASCIIOP_RETURN(); }
424"<" { ASCIIOP_RETURN(); }
425">" { ASCIIOP_RETURN(); }
426"=" { ASCIIOP_RETURN(); }
427"?" { ASCIIOP_RETURN(); }
428
429"++" { NAMEDOP_RETURN(ICR); }
430"--" { NAMEDOP_RETURN(DECR); }
431"==" { NAMEDOP_RETURN(EQ); }
432"!=" { NAMEDOP_RETURN(NE); }
433"<<" { NAMEDOP_RETURN(LS); }
434">>" { NAMEDOP_RETURN(RS); }
435"<=" { NAMEDOP_RETURN(LE); }
436">=" { NAMEDOP_RETURN(GE); }
437"&&" { NAMEDOP_RETURN(ANDAND); }
438"||" { NAMEDOP_RETURN(OROR); }
439"->" { NAMEDOP_RETURN(ARROW); }
440"+=" { NAMEDOP_RETURN(PLUSassign); }
441"-=" { NAMEDOP_RETURN(MINUSassign); }
442"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
443"*=" { NAMEDOP_RETURN(MULTassign); }
444"/=" { NAMEDOP_RETURN(DIVassign); }
445"%=" { NAMEDOP_RETURN(MODassign); }
446"&=" { NAMEDOP_RETURN(ANDassign); }
447"|=" { NAMEDOP_RETURN(ORassign); }
448"^=" { NAMEDOP_RETURN(ERassign); }
449"<<=" { NAMEDOP_RETURN(LSassign); }
450">>=" { NAMEDOP_RETURN(RSassign); }
451
452"@=" { NAMEDOP_RETURN(ATassign); } // CFA
453"~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
454"-~" { NAMEDOP_RETURN(ErangeDown); } // CFA
455"-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA
456
457 /* CFA, operator identifier */
458{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
459"?"({op_unary_pre_post}|"()"|"[?]"|"{}") { IDENTIFIER_RETURN(); }
460"^?{}" { IDENTIFIER_RETURN(); }
461"?`"{identifier} { // postfix operator
462 yylval.tok.str = new string( &yytext[2] ); // remove ?`
463 yylval.tok.str = build_postfix_name( yylval.tok.str ); // add prefix
464 RETURN_LOCN( typedefTable.isKind( *yylval.tok.str ) );
465}
466"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
467 /*
468 This rule handles ambiguous cases with operator identifiers, e.g., "int *?*?()", where the string "*?*?" can be
469 lexed as "*?"/"*?" or "*"/"?*?". Since it is common practise to put a unary operator juxtaposed to an identifier,
470 e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
471 a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
472 reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
473 identifier to disambiguate this common case.
474
475 A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
476 occurs when the deference operator has no parameters, *?() and *?()(...), requiring arbitrary whitespace
477 look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
478 parameter/argument to dereference *?(...). Hence, always interpreting the string *?() as * ?() does not preclude
479 any meaningful program.
480
481 The remaining cases are with the increment/decrement operators and conditional expression:
482
483 i++? ...(...);
484 i?++ ...(...);
485
486 requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
487 incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
488 space:
489
490 i++ ? i : 0;
491 i? ++i : 0;
492 */
493{op_unary}"?"({op_unary_pre_post}|"()"|"[?]"|{op_binary_over}"?") {
494 // 1 or 2 character unary operator ?
495 int i = yytext[1] == '?' ? 1 : 2;
496 yyless( i ); // put back characters up to first '?'
497 if ( i > 1 ) {
498 NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
499 } else {
500 ASCIIOP_RETURN();
501 } // if
502}
503
504 /* unknown character */
505. { yyerror( "unknown character" ); }
506
507%%
508
509// ----end of lexer----
510
511void yyerror( const char * errmsg ) {
512 SemanticErrorThrow = true;
513 cerr << (yyfilename ? yyfilename : "*unknown file*") << ':' << yylineno << ':' << column - yyleng + 1
514 << ": " << ErrorHelpers::error_str() << errmsg << " before token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
515}
516
517// Local Variables: //
518// mode: c++ //
519// tab-width: 4 //
520// compile-command: "make install" //
521// End: //
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