/*
* Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
*
* The contents of this file are covered under the licence agreement in the
* file "LICENCE" distributed with Cforall.
*
* lex.ll --
*
* Author : Peter A. Buhr
* Created On : Sat Sep 22 08:58:10 2001
* Last Modified By : Peter A. Buhr
* Last Modified On : Thu Jun 27 14:38:27 2024
* Update Count : 780
*/
%option yylineno
%option noyywrap
%option nounput
%{
// The lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive have been
// performed and removed from the source. The only exceptions are preprocessor directives passed to the compiler (e.g.,
// line-number directives) and C/C++ style comments, which are ignored.
// *************************** Includes and Defines ****************************
#ifdef __clang__
#pragma GCC diagnostic ignored "-Wnull-conversion"
#endif
// trigger before each matching rule's action
#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 : "";
unsigned int column = 0; // position of the end of the last token parsed
#include
#include // FILENAME_MAX
using namespace std;
#include "config.h" // configure info
#include "DeclarationNode.hpp" // for DeclarationNode
#include "ExpressionNode.hpp" // for LabelNode
#include "InitializerNode.hpp" // for InitializerNode
#include "ParseNode.hpp"
#include "ParserTypes.hpp" // for Token
#include "StatementNode.hpp" // for CondCtl, ForCtrl
#include "TypedefTable.hpp"
// This (generated) header must come late as it is missing includes.
#include "parser.hh" // generated info
string * build_postfix_name( string * name );
char *yyfilename;
string *strtext; // accumulate parts of character and string constant value
#define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x )
#define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x )
#define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x )
#define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x )
#define WHITE_RETURN(x) // do nothing
#define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' )
#define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator
#define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name
#define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant
#define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword
#define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword
#define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) )
#ifdef HAVE_KEYWORDS_FLOATXX // GCC >= 7 => keyword, otherwise typedef
#define FLOATXX(v) KEYWORD_RETURN(v);
#else
#define FLOATXX(v) IDENTIFIER_RETURN();
#endif // HAVE_KEYWORDS_FLOATXX
void rm_underscore() {
// SKULLDUGGERY: remove underscores (ok to shorten?)
yyleng = 0;
for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string
if ( yytext[i] != '_' ) {
yytext[yyleng] = yytext[i];
yyleng += 1;
} // if
} // for
yytext[yyleng] = '\0';
} // rm_underscore
// Stop warning due to incorrectly generated flex code.
#pragma GCC diagnostic ignored "-Wsign-compare"
%}
binary [0-1]
octal [0-7]
nonzero [1-9]
decimal [0-9]
hex [0-9a-fA-F]
universal_char "\\"((u"_"?{hex_quad})|(U"_"?{hex_quad}{2}))
// identifier, GCC: $ in identifier
identifier ([a-zA-Z_$]|{universal_char})([0-9a-zA-Z_$]|{universal_char})*
// numeric constants, CFA: '_' in constant
hex_quad {hex}("_"?{hex}){3}
size_opt (8|16|32|64|128)?
// CFA: explicit l8/l16/l32/l64/l128, char 'hh', short 'h', int 'n'
length ("ll"|"LL"|[lL]{size_opt})|("hh"|"HH"|[hHnN])
// CFA: size_t 'z', pointer 'p', which define a sign and length
integer_suffix_opt ("_"?(([uU]({length}?[iI]?)|([iI]{length}))|([iI]({length}?[uU]?)|([uU]{length}))|({length}([iI]?[uU]?)|([uU][iI]))|[zZ]|[pP]))?
octal_digits ({octal})|({octal}({octal}|"_")*{octal})
octal_prefix "0""_"?
octal_constant (("0")|({octal_prefix}{octal_digits})){integer_suffix_opt}
nonzero_digits ({nonzero})|({nonzero}({decimal}|"_")*{decimal})
decimal_constant {nonzero_digits}{integer_suffix_opt}
binary_digits ({binary})|({binary}({binary}|"_")*{binary})
binary_prefix "0"[bB]"_"?
binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt}
hex_digits ({hex})|({hex}({hex}|"_")*{hex})
hex_prefix "0"[xX]"_"?
hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt}
// GCC: floating D (double), imaginary iI, and decimal floating DF, DD, DL
exponent "_"?[eE]"_"?[+-]?{decimal_digits}
floating_size 16|32|32x|64|64x|80|128|128x
floating_length ([fFdDlLwWqQ]|[fF]{floating_size})
floating_suffix ({floating_length}?[iI]?)|([iI]{floating_length})
decimal_floating_suffix [dD][fFdDlL]
floating_suffix_opt ("_"?({floating_suffix}|{decimal_floating_suffix}))?
decimal_digits ({decimal})|({decimal}({decimal}|"_")*{decimal})
floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt}
floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt}
floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})|({decimal_digits}{floating_fraction})
binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits}
hex_floating_suffix_opt ("_"?({floating_suffix}))?
hex_floating_fraction ({hex_digits}?"."{hex_digits})|({hex_digits}".")
hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})|({hex_digits}{binary_exponent})){hex_floating_suffix_opt}
// character escape sequence, GCC: \e => esc character
simple_escape "\\"[abefnrtv'"?\\]
// ' stop editor highlighting
octal_escape "\\"{octal}("_"?{octal}){0,2}
hex_escape "\\""x""_"?{hex_digits}
escape_seq {simple_escape}|{octal_escape}|{hex_escape}|{universal_char}
cwide_prefix "L"|"U"|"u"
swide_prefix {cwide_prefix}|"u8"
// display/white-space characters
h_tab [\011]
form_feed [\014]
v_tab [\013]
c_return [\015]
h_white [ ]|{h_tab}
// overloadable operators
op_unary_only "~"|"!"
op_unary_binary "+"|"-"|"*"
op_unary_pre_post "++"|"--"
op_unary {op_unary_only}|{op_unary_binary}|{op_unary_pre_post}
op_binary_only "/"|"%"|"\\"|"^"|"&"|"|"|"<"|">"|"="|"=="|"!="|"<<"|">>"|"<="|">="|"+="|"-="|"*="|"/="|"%="|"\\="|"&="|"|="|"^="|"<<="|">>="
op_binary_over {op_unary_binary}|{op_binary_only}
// op_binary_not_over "?"|"->"|"."|"&&"|"||"|"@="
// operator {op_unary_pre_post}|{op_binary_over}|{op_binary_not_over}
%x COMMENT
%x BKQUOTE
%x QUOTE
%x STRING
%%
/* line directives */
^{h_white}*"#"{h_white}*[0-9]+{h_white}*["][^"\n]+["].*"\n" {
/* " stop editor highlighting */
static char filename[FILENAME_MAX]; // temporarily store current source-file name
char *end_num;
char *begin_string, *end_string;
long lineno, length;
lineno = strtol( yytext + 1, &end_num, 0 );
begin_string = strchr( end_num, '"' );
if ( begin_string ) { // file name ?
end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter
assert( end_string ); // closing quote ?
length = end_string - begin_string - 1; // file-name length without quotes or sentinel
assert( length < FILENAME_MAX ); // room for sentinel ?
memcpy( &filename, begin_string + 1, length ); // copy file name from yytext
filename[ length ] = '\0'; // terminate string with sentinel
//cout << "file " << filename << " line " << lineno << endl;
yylineno = lineno;
yyfilename = filename;
} // if
}
/* preprocessor-style directives */
^{h_white}*"#"[^\n]*"\n" { RETURN_VAL( DIRECTIVE ); }
/* ignore C style comments (ALSO HANDLED BY CPP) */
"/*" { BEGIN COMMENT; }
.|\n ;
"*/" { BEGIN 0; }
/* ignore C++ style comments (ALSO HANDLED BY CPP) */
"//"[^\n]*"\n" ;
/* ignore whitespace */
{h_white}+ { WHITE_RETURN(' '); }
({v_tab}|{c_return}|{form_feed})+ { WHITE_RETURN(' '); }
({h_white}|{v_tab}|{c_return}|{form_feed})*"\n" { NEWLINE_RETURN(); }
/* keywords */
alignas { KEYWORD_RETURN(ALIGNAS); } // CFA
_Alignas { KEYWORD_RETURN(ALIGNAS); } // C11
alignof { KEYWORD_RETURN(ALIGNOF); } // CFA
_Alignof { KEYWORD_RETURN(ALIGNOF); } // C11
__alignof { KEYWORD_RETURN(ALIGNOF); } // GCC
__alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC
and { QKEYWORD_RETURN(WAND); } // CFA
asm { KEYWORD_RETURN(ASM); }
__asm { KEYWORD_RETURN(ASM); } // GCC
__asm__ { KEYWORD_RETURN(ASM); } // GCC
_Atomic { KEYWORD_RETURN(ATOMIC); } // C11
__attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC
__attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC
auto { KEYWORD_RETURN(AUTO); }
__auto_type { KEYWORD_RETURN(AUTO_TYPE); }
basetypeof { KEYWORD_RETURN(BASETYPEOF); } // CFA
_Bool { KEYWORD_RETURN(BOOL); } // C99
break { KEYWORD_RETURN(BREAK); }
case { KEYWORD_RETURN(CASE); }
catch { QKEYWORD_RETURN(CATCH); } // CFA
catchResume { QKEYWORD_RETURN(CATCHRESUME); } // CFA
char { KEYWORD_RETURN(CHAR); }
choose { KEYWORD_RETURN(CHOOSE); } // CFA
coerce { KEYWORD_RETURN(COERCE); } // CFA
corun { KEYWORD_RETURN(CORUN); } // CFA
cofor { KEYWORD_RETURN(COFOR); } // CFA
_Complex { KEYWORD_RETURN(COMPLEX); } // C99
__complex { KEYWORD_RETURN(COMPLEX); } // GCC
__complex__ { KEYWORD_RETURN(COMPLEX); } // GCC
const { KEYWORD_RETURN(CONST); }
__const { KEYWORD_RETURN(CONST); } // GCC
__const__ { KEYWORD_RETURN(CONST); } // GCC
continue { KEYWORD_RETURN(CONTINUE); }
coroutine { KEYWORD_RETURN(COROUTINE); } // CFA
_Decimal32 { KEYWORD_RETURN(DECIMAL32); } // GCC
_Decimal64 { KEYWORD_RETURN(DECIMAL64); } // GCC
_Decimal128 { KEYWORD_RETURN(DECIMAL128); } // GCC
default { KEYWORD_RETURN(DEFAULT); }
disable { KEYWORD_RETURN(DISABLE); } // CFA
do { KEYWORD_RETURN(DO); }
double { KEYWORD_RETURN(DOUBLE); }
dtype { KEYWORD_RETURN(DTYPE); } // CFA
else { KEYWORD_RETURN(ELSE); }
enable { KEYWORD_RETURN(ENABLE); } // CFA
enum { KEYWORD_RETURN(ENUM); }
exception { KEYWORD_RETURN(EXCEPTION); } // CFA
__extension__ { KEYWORD_RETURN(EXTENSION); } // GCC
extern { KEYWORD_RETURN(EXTERN); }
fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA
fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA
finally { QKEYWORD_RETURN(FINALLY); } // CFA
fixup { QKEYWORD_RETURN(FIXUP); } // CFA
float { KEYWORD_RETURN(FLOAT); }
__float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC
__float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC
_Float16 { FLOATXX(uFLOAT16); } // GCC
_Float32 { FLOATXX(uFLOAT32); } // GCC
_Float32x { FLOATXX(uFLOAT32X); } // GCC
_Float64 { FLOATXX(uFLOAT64); } // GCC
_Float64x { FLOATXX(uFLOAT64X); } // GCC
_Float128 { FLOATXX(uFLOAT128); } // GCC
_Float128x { FLOATXX(uFLOAT128); } // GCC
for { KEYWORD_RETURN(FOR); }
forall { KEYWORD_RETURN(FORALL); } // CFA
fortran { KEYWORD_RETURN(FORTRAN); }
ftype { KEYWORD_RETURN(FTYPE); } // CFA
generator { KEYWORD_RETURN(GENERATOR); } // CFA
_Generic { KEYWORD_RETURN(GENERIC); } // C11
goto { KEYWORD_RETURN(GOTO); }
if { KEYWORD_RETURN(IF); }
_Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99
__imag { KEYWORD_RETURN(IMAGINARY); } // GCC
__imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC
inline { KEYWORD_RETURN(INLINE); } // C99
__inline { KEYWORD_RETURN(INLINE); } // GCC
__inline__ { KEYWORD_RETURN(INLINE); } // GCC
int { KEYWORD_RETURN(INT); }
int128 { KEYWORD_RETURN(INT128); } // CFA
__int128 { KEYWORD_RETURN(INT128); } // GCC
__int128_t { KEYWORD_RETURN(INT128); } // GCC
__label__ { KEYWORD_RETURN(LABEL); } // GCC
long { KEYWORD_RETURN(LONG); }
monitor { KEYWORD_RETURN(MONITOR); } // CFA
mutex { KEYWORD_RETURN(MUTEX); } // CFA
_Noreturn { KEYWORD_RETURN(NORETURN); } // C11
__builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC
one_t { NUMERIC_RETURN(ONE_T); } // CFA
or { QKEYWORD_RETURN(WOR); } // CFA
otype { KEYWORD_RETURN(OTYPE); } // CFA
recover { QKEYWORD_RETURN(RECOVER); } // CFA
register { KEYWORD_RETURN(REGISTER); }
report { KEYWORD_RETURN(THROWRESUME); } // CFA
restrict { KEYWORD_RETURN(RESTRICT); } // C99
__restrict { KEYWORD_RETURN(RESTRICT); } // GCC
__restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC
return { KEYWORD_RETURN(RETURN); }
/* resume { KEYWORD_RETURN(RESUME); } // CFA */
short { KEYWORD_RETURN(SHORT); }
signed { KEYWORD_RETURN(SIGNED); }
__signed { KEYWORD_RETURN(SIGNED); } // GCC
__signed__ { KEYWORD_RETURN(SIGNED); } // GCC
sizeof { KEYWORD_RETURN(SIZEOF); }
countof { KEYWORD_RETURN(COUNTOF); } // GCC
static { KEYWORD_RETURN(STATIC); }
_Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11
static_assert { KEYWORD_RETURN(STATICASSERT); } // C23
struct { KEYWORD_RETURN(STRUCT); }
suspend { KEYWORD_RETURN(SUSPEND); } // CFA
switch { KEYWORD_RETURN(SWITCH); }
thread { KEYWORD_RETURN(THREAD); } // C11
__thread { KEYWORD_RETURN(THREADLOCALGCC); } // GCC
_Thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C11
thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C23
throw { KEYWORD_RETURN(THROW); } // CFA
throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA
timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA
trait { KEYWORD_RETURN(TRAIT); } // CFA
try { KEYWORD_RETURN(TRY); } // CFA
ttype { KEYWORD_RETURN(TTYPE); } // CFA
typedef { KEYWORD_RETURN(TYPEDEF); }
typeof { KEYWORD_RETURN(TYPEOF); } // GCC
__typeof { KEYWORD_RETURN(TYPEOF); } // GCC
__typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC
typeid { KEYWORD_RETURN(TYPEID); } // GCC
union { KEYWORD_RETURN(UNION); }
__uint128_t { KEYWORD_RETURN(UINT128); } // GCC
unsigned { KEYWORD_RETURN(UNSIGNED); }
__builtin_va_arg { KEYWORD_RETURN(VA_ARG); } // GCC
__builtin_va_list { KEYWORD_RETURN(VA_LIST); } // GCC
virtual { KEYWORD_RETURN(VIRTUAL); } // CFA
void { KEYWORD_RETURN(VOID); }
volatile { KEYWORD_RETURN(VOLATILE); }
__volatile { KEYWORD_RETURN(VOLATILE); } // GCC
__volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC
vtable { KEYWORD_RETURN(VTABLE); } // CFA
waitfor { KEYWORD_RETURN(WAITFOR); } // CFA
waituntil { KEYWORD_RETURN(WAITUNTIL); } // CFA
when { KEYWORD_RETURN(WHEN); } // CFA
while { KEYWORD_RETURN(WHILE); }
with { KEYWORD_RETURN(WITH); } // CFA
zero_t { NUMERIC_RETURN(ZERO_T); } // CFA
/* identifier */
{identifier} { IDENTIFIER_RETURN(); }
"``"{identifier} { // CFA
yytext[yyleng] = '\0'; yytext += 2; // SKULLDUGGERY: remove backquotes (ok to shorten?)
IDENTIFIER_RETURN();
}
/* numeric constants */
{binary_constant} { NUMERIC_RETURN(INTEGERconstant); }
{octal_constant} { NUMERIC_RETURN(INTEGERconstant); }
{decimal_constant} { NUMERIC_RETURN(INTEGERconstant); }
{hex_constant} { NUMERIC_RETURN(INTEGERconstant); }
{floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant
{floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant
{floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
{hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); }
/* character constant, allows empty value */
({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); }
[^'\\\n]* { strtext->append( yytext, yyleng ); }
['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); }
/* ' stop editor highlighting */
/* string constant */
({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); }
[^"\\\n]* { strtext->append( yytext, yyleng ); }
["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); }
/* " stop editor highlighting */
/* common character/string constant */
{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); }
"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP)
"\\" { strtext->append( yytext, yyleng ); } // unknown escape character
/* punctuation */
"@" { ASCIIOP_RETURN(); }
"`" { ASCIIOP_RETURN(); }
"[" { ASCIIOP_RETURN(); }
"]" { ASCIIOP_RETURN(); }
"(" { ASCIIOP_RETURN(); }
")" { ASCIIOP_RETURN(); }
"{" { ASCIIOP_RETURN(); }
"}" { ASCIIOP_RETURN(); }
"," { ASCIIOP_RETURN(); } // also operator
":" { ASCIIOP_RETURN(); }
";" { ASCIIOP_RETURN(); }
"." { ASCIIOP_RETURN(); } // also operator
"@@" { NAMEDOP_RETURN(ATTR); } // CFA, attribute shorthand
"..." { NAMEDOP_RETURN(ELLIPSIS); }
/* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */
"<:" { RETURN_VAL('['); }
":>" { RETURN_VAL(']'); }
"<%" { RETURN_VAL('{'); }
"%>" { RETURN_VAL('}'); }
/* operators */
"!" { ASCIIOP_RETURN(); }
"+" { ASCIIOP_RETURN(); }
"-" { ASCIIOP_RETURN(); }
"*" { ASCIIOP_RETURN(); }
"\\" { ASCIIOP_RETURN(); } // CFA, exponentiation
"/" { ASCIIOP_RETURN(); }
"%" { ASCIIOP_RETURN(); }
"^" { ASCIIOP_RETURN(); }
"~" { ASCIIOP_RETURN(); }
"&" { ASCIIOP_RETURN(); }
"|" { ASCIIOP_RETURN(); }
"<" { ASCIIOP_RETURN(); }
">" { ASCIIOP_RETURN(); }
"=" { ASCIIOP_RETURN(); }
"?" { ASCIIOP_RETURN(); }
"++" { NAMEDOP_RETURN(ICR); }
"--" { NAMEDOP_RETURN(DECR); }
"==" { NAMEDOP_RETURN(EQ); }
"!=" { NAMEDOP_RETURN(NE); }
"<<" { NAMEDOP_RETURN(LS); }
">>" { NAMEDOP_RETURN(RS); }
"<=" { NAMEDOP_RETURN(LE); }
">=" { NAMEDOP_RETURN(GE); }
"&&" { NAMEDOP_RETURN(ANDAND); }
"||" { NAMEDOP_RETURN(OROR); }
"->" { NAMEDOP_RETURN(ARROW); }
"+=" { NAMEDOP_RETURN(PLUSassign); }
"-=" { NAMEDOP_RETURN(MINUSassign); }
"\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation
"*=" { NAMEDOP_RETURN(MULTassign); }
"/=" { NAMEDOP_RETURN(DIVassign); }
"%=" { NAMEDOP_RETURN(MODassign); }
"&=" { NAMEDOP_RETURN(ANDassign); }
"|=" { NAMEDOP_RETURN(ORassign); }
"^=" { NAMEDOP_RETURN(ERassign); }
"<<=" { NAMEDOP_RETURN(LSassign); }
">>=" { NAMEDOP_RETURN(RSassign); }
"@=" { NAMEDOP_RETURN(ATassign); } // CFA
"+~" { NAMEDOP_RETURN(ErangeUp); } // CFA
"~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
"+~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA
"-~" { NAMEDOP_RETURN(ErangeDown); } // CFA
"-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA
/* CFA, operator identifier */
{op_unary}"?" { IDENTIFIER_RETURN(); } // unary
"?"({op_unary_pre_post}|"()"|"[?]"|"{}") { IDENTIFIER_RETURN(); }
"^?{}" { IDENTIFIER_RETURN(); }
"?`"{identifier} { // postfix operator
yylval.tok.str = new string( &yytext[2] ); // remove ?`
yylval.tok.str = build_postfix_name( yylval.tok.str ); // add prefix
RETURN_LOCN( typedefTable.isKind( *yylval.tok.str ) );
}
"?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary
/*
This rule handles ambiguous cases with operator identifiers, e.g., "int *?*?()", where the string "*?*?" can be
lexed as "*?"/"*?" or "*"/"?*?". Since it is common practise to put a unary operator juxtaposed to an identifier,
e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is
a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then
reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator
identifier to disambiguate this common case.
A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity
occurs when the deference operator has no parameters, *?() and *?()(...), requiring arbitrary whitespace
look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a
parameter/argument to dereference *?(...). Hence, always interpreting the string *?() as * ?() does not preclude
any meaningful program.
The remaining cases are with the increment/decrement operators and conditional expression:
i++? ...(...);
i?++ ...(...);
requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an
incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a
space:
i++ ? i : 0;
i? ++i : 0;
*/
{op_unary}"?"({op_unary_pre_post}|"()"|"[?]"|{op_binary_over}"?") {
// 1 or 2 character unary operator ?
int i = yytext[1] == '?' ? 1 : 2;
yyless( i ); // put back characters up to first '?'
if ( i > 1 ) {
NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR );
} else {
ASCIIOP_RETURN();
} // if
}
/* unknown character */
. { yyerror( "unknown character" ); }
%%
// ----end of lexer----
void yyerror( const char * errmsg ) {
SemanticErrorThrow = true;
cerr << (yyfilename ? yyfilename : "*unknown file*") << ':' << yylineno << ':' << column - yyleng + 1
<< ": " << ErrorHelpers::error_str() << errmsg << " before token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl;
}
// Local Variables: //
// mode: c++ //
// tab-width: 4 //
// compile-command: "make install" //
// End: //