[b87a5ed] | 1 | /* |
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| 2 | * Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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| 3 | * |
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| 4 | * The contents of this file are covered under the licence agreement in the |
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| 5 | * file "LICENCE" distributed with Cforall. |
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[51b7345] | 6 | * |
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| 7 | * lex.l -- |
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| 8 | * |
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| 9 | * Author : Peter A. Buhr |
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| 10 | * Created On : Sat Sep 22 08:58:10 2001 |
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| 11 | * Last Modified By : Peter A. Buhr |
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[de62360d] | 12 | * Last Modified On : Fri Jun 19 11:10:14 2015 |
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| 13 | * Update Count : 392 |
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[51b7345] | 14 | */ |
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| 15 | |
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| 16 | %option yylineno |
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[5f2f2d7] | 17 | %option nounput |
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[51b7345] | 18 | |
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| 19 | %{ |
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[de62360d] | 20 | // This lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive have been |
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| 21 | // performed and removed from the source. The only exceptions are preprocessor directives passed to the compiler (e.g., |
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| 22 | // line-number directives) and C/C++ style comments, which are ignored. |
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[51b7345] | 23 | |
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[8c17ab0] | 24 | //**************************** Includes and Defines **************************** |
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[51b7345] | 25 | |
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| 26 | #include <string> |
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| 27 | |
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| 28 | #include "lex.h" |
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| 29 | #include "ParseNode.h" |
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[59db689] | 30 | #include "parser.h" // YACC generated definitions based on C++ grammar |
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[51b7345] | 31 | |
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| 32 | char *yyfilename; |
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[b87a5ed] | 33 | std::string *strtext; // accumulate parts of character and string constant value |
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[51b7345] | 34 | |
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[de62360d] | 35 | #define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x ) |
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| 36 | #define RETURN_VAL(x) yylval.tok.str = new std::string( yytext ); RETURN_LOCN( x ) |
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| 37 | #define RETURN_CHAR(x) yylval.tok.str = NULL; RETURN_LOCN( x ) |
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| 38 | #define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x ) |
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[5f2f2d7] | 39 | |
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[b87a5ed] | 40 | #define WHITE_RETURN(x) // do nothing |
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[de62360d] | 41 | #define NEWLINE_RETURN() WHITE_RETURN( '\n' ) |
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| 42 | #define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator |
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| 43 | #define NAMEDOP_RETURN(x) RETURN_VAL( x ) // multichar operator, with a name |
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| 44 | #define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant |
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| 45 | #define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword |
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| 46 | #define IDENTIFIER_RETURN() RETURN_VAL( (typedefTable.isIdentifier( yytext ) ? IDENTIFIER : typedefTable.isTypedef( yytext ) ? TYPEDEFname : TYPEGENname ) ) |
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| 47 | #define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER ) |
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[51b7345] | 48 | |
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[3848e0e] | 49 | void rm_underscore() { |
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[b87a5ed] | 50 | // remove underscores in numeric constant |
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| 51 | int j = 0; |
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| 52 | for ( int i = 0; yytext[i] != '\0'; i += 1 ) { |
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| 53 | if ( yytext[i] != '_' ) { |
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| 54 | yytext[j] = yytext[i]; |
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| 55 | j += 1; |
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| 56 | } // if |
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| 57 | } // for |
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| 58 | yyleng = j; |
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| 59 | yytext[yyleng] = '\0'; |
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[51b7345] | 60 | } |
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| 61 | |
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| 62 | %} |
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| 63 | |
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| 64 | octal [0-7] |
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| 65 | nonzero [1-9] |
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| 66 | decimal [0-9] |
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| 67 | hex [0-9a-fA-F] |
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[3848e0e] | 68 | universal_char "\\"((u"_"?{hex_quad})|(U"_"?{hex_quad}{2})) |
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[51b7345] | 69 | |
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[b87a5ed] | 70 | // identifier, GCC: $ in identifier |
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[51b7345] | 71 | identifier ([a-zA-Z_$]|{universal_char})([0-9a-zA-Z_$]|{universal_char})* |
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| 72 | |
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[b87a5ed] | 73 | // quoted identifier |
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[8c17ab0] | 74 | quoted_identifier "`"{identifier}"`" |
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| 75 | |
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[b87a5ed] | 76 | // attribute identifier, GCC: $ in identifier |
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[51b7345] | 77 | attr_identifier "@"{identifier} |
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| 78 | |
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[b87a5ed] | 79 | // numeric constants, CFA: '_' in constant |
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[3848e0e] | 80 | hex_quad {hex}("_"?{hex}){3} |
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[51b7345] | 81 | integer_suffix "_"?(([uU][lL]?)|([uU]("ll"|"LL")?)|([lL][uU]?)|("ll"|"LL")[uU]?) |
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| 82 | |
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| 83 | octal_digits ({octal})|({octal}({octal}|"_")*{octal}) |
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| 84 | octal_prefix "0""_"? |
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| 85 | octal_constant (("0")|({octal_prefix}{octal_digits})){integer_suffix}? |
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| 86 | |
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| 87 | nonzero_digits ({nonzero})|({nonzero}({decimal}|"_")*{decimal}) |
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| 88 | decimal_constant {nonzero_digits}{integer_suffix}? |
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| 89 | |
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| 90 | hex_digits ({hex})|({hex}({hex}|"_")*{hex}) |
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| 91 | hex_prefix "0"[xX]"_"? |
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| 92 | hex_constant {hex_prefix}{hex_digits}{integer_suffix}? |
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| 93 | |
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| 94 | decimal_digits ({decimal})|({decimal}({decimal}|"_")*{decimal}) |
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| 95 | fractional_constant ({decimal_digits}?"."{decimal_digits})|({decimal_digits}".") |
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| 96 | exponent "_"?[eE]"_"?[+-]?{decimal_digits} |
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| 97 | floating_suffix "_"?[flFL] |
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| 98 | floating_constant (({fractional_constant}{exponent}?)|({decimal_digits}{exponent})){floating_suffix}? |
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| 99 | |
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| 100 | binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits} |
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| 101 | hex_fractional_constant ({hex_digits}?"."{hex_digits})|({hex_digits}".") |
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| 102 | hex_floating_constant {hex_prefix}(({hex_fractional_constant}{binary_exponent})|({hex_digits}{binary_exponent})){floating_suffix}? |
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| 103 | |
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[b87a5ed] | 104 | // character escape sequence, GCC: \e => esc character |
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[51b7345] | 105 | simple_escape "\\"[abefnrtv'"?\\] |
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[b87a5ed] | 106 | // ' stop highlighting |
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[3848e0e] | 107 | octal_escape "\\"{octal}("_"?{octal}){0,2} |
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| 108 | hex_escape "\\""x""_"?{hex_digits} |
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[51b7345] | 109 | escape_seq {simple_escape}|{octal_escape}|{hex_escape}|{universal_char} |
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[59db689] | 110 | cwide_prefix "L"|"U"|"u" |
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| 111 | swide_prefix {cwide_prefix}|"u8" |
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[51b7345] | 112 | |
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[b87a5ed] | 113 | // display/white-space characters |
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[51b7345] | 114 | h_tab [\011] |
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| 115 | form_feed [\014] |
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| 116 | v_tab [\013] |
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| 117 | c_return [\015] |
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| 118 | h_white [ ]|{h_tab} |
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| 119 | |
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[b87a5ed] | 120 | // operators |
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[51b7345] | 121 | op_unary_only "~"|"!" |
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| 122 | op_unary_binary "+"|"-"|"*" |
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| 123 | op_unary_pre_post "++"|"--" |
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| 124 | op_unary {op_unary_only}|{op_unary_binary}|{op_unary_pre_post} |
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| 125 | |
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| 126 | op_binary_only "/"|"%"|"^"|"&"|"|"|"<"|">"|"="|"=="|"!="|"<<"|">>"|"<="|">="|"+="|"-="|"*="|"/="|"%="|"&="|"|="|"^="|"<<="|">>=" |
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| 127 | op_binary_over {op_unary_binary}|{op_binary_only} |
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| 128 | op_binary_not_over "?"|"->"|"&&"|"||" |
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| 129 | operator {op_unary_pre_post}|{op_binary_over}|{op_binary_not_over} |
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| 130 | |
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| 131 | %x COMMENT |
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[3848e0e] | 132 | %x BKQUOTE |
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| 133 | %x QUOTE |
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| 134 | %x STRING |
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[51b7345] | 135 | |
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| 136 | %% |
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[b87a5ed] | 137 | /* line directives */ |
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[51b7345] | 138 | ^{h_white}*"#"{h_white}*[0-9]+{h_white}*["][^"\n]+["][^\n]*"\n" { |
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[8c17ab0] | 139 | /* " stop highlighting */ |
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[51b7345] | 140 | char *end_num; |
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| 141 | char *begin_string, *end_string; |
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| 142 | char *filename; |
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| 143 | long lineno, length; |
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| 144 | lineno = strtol( yytext + 1, &end_num, 0 ); |
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| 145 | begin_string = strchr( end_num, '"' ); |
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[3848e0e] | 146 | if ( begin_string ) { |
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[b87a5ed] | 147 | end_string = strchr( begin_string + 1, '"' ); |
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| 148 | if ( end_string ) { |
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| 149 | length = end_string - begin_string - 1; |
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| 150 | filename = new char[ length + 1 ]; |
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| 151 | memcpy( filename, begin_string + 1, length ); |
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| 152 | filename[ length ] = '\0'; |
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| 153 | //std::cout << "file " << filename << " line " << lineno << std::endl; |
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| 154 | yylineno = lineno; |
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| 155 | yyfilename = filename; |
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| 156 | } // if |
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| 157 | } // if |
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[51b7345] | 158 | } |
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| 159 | |
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[b87a5ed] | 160 | /* ignore preprocessor directives (for now) */ |
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[51b7345] | 161 | ^{h_white}*"#"[^\n]*"\n" ; |
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| 162 | |
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[cd623a4] | 163 | /* ignore C style comments (ALSO HANDLED BY CPP) */ |
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[3848e0e] | 164 | "/*" { BEGIN COMMENT; } |
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[cd623a4] | 165 | <COMMENT>.|\n ; |
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| 166 | <COMMENT>"*/" { BEGIN 0; } |
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[51b7345] | 167 | |
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[cd623a4] | 168 | /* ignore C++ style comments (ALSO HANDLED BY CPP) */ |
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| 169 | "//"[^\n]*"\n" ; |
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[51b7345] | 170 | |
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[b87a5ed] | 171 | /* ignore whitespace */ |
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[3848e0e] | 172 | {h_white}+ { WHITE_RETURN(' '); } |
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| 173 | ({v_tab}|{c_return}|{form_feed})+ { WHITE_RETURN(' '); } |
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| 174 | ({h_white}|{v_tab}|{c_return}|{form_feed})*"\n" { NEWLINE_RETURN(); } |
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[51b7345] | 175 | |
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[b87a5ed] | 176 | /* keywords */ |
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| 177 | _Alignas { KEYWORD_RETURN(ALIGNAS); } // C11 |
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| 178 | _Alignof { KEYWORD_RETURN(ALIGNOF); } // C11 |
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| 179 | __alignof { KEYWORD_RETURN(ALIGNOF); } // GCC |
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| 180 | __alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC |
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| 181 | asm { KEYWORD_RETURN(ASM); } |
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| 182 | __asm { KEYWORD_RETURN(ASM); } // GCC |
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| 183 | __asm__ { KEYWORD_RETURN(ASM); } // GCC |
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| 184 | _Atomic { KEYWORD_RETURN(ATOMIC); } // C11 |
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| 185 | __attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC |
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| 186 | __attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC |
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[3848e0e] | 187 | auto { KEYWORD_RETURN(AUTO); } |
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[b87a5ed] | 188 | _Bool { KEYWORD_RETURN(BOOL); } // C99 |
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[3848e0e] | 189 | break { KEYWORD_RETURN(BREAK); } |
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| 190 | case { KEYWORD_RETURN(CASE); } |
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[b87a5ed] | 191 | catch { KEYWORD_RETURN(CATCH); } // CFA |
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[3848e0e] | 192 | char { KEYWORD_RETURN(CHAR); } |
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[b87a5ed] | 193 | choose { KEYWORD_RETURN(CHOOSE); } // CFA |
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| 194 | _Complex { KEYWORD_RETURN(COMPLEX); } // C99 |
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| 195 | __complex { KEYWORD_RETURN(COMPLEX); } // GCC |
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| 196 | __complex__ { KEYWORD_RETURN(COMPLEX); } // GCC |
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[3848e0e] | 197 | const { KEYWORD_RETURN(CONST); } |
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[b87a5ed] | 198 | __const { KEYWORD_RETURN(CONST); } // GCC |
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| 199 | __const__ { KEYWORD_RETURN(CONST); } // GCC |
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| 200 | context { KEYWORD_RETURN(CONTEXT); } // CFA |
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[3848e0e] | 201 | continue { KEYWORD_RETURN(CONTINUE); } |
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| 202 | default { KEYWORD_RETURN(DEFAULT); } |
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[b87a5ed] | 203 | do { KEYWORD_RETURN(DO); } |
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[3848e0e] | 204 | double { KEYWORD_RETURN(DOUBLE); } |
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[b87a5ed] | 205 | dtype { KEYWORD_RETURN(DTYPE); } // CFA |
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[3848e0e] | 206 | else { KEYWORD_RETURN(ELSE); } |
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| 207 | enum { KEYWORD_RETURN(ENUM); } |
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[b87a5ed] | 208 | __extension__ { KEYWORD_RETURN(EXTENSION); } // GCC |
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[3848e0e] | 209 | extern { KEYWORD_RETURN(EXTERN); } |
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[b87a5ed] | 210 | fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA |
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| 211 | finally { KEYWORD_RETURN(FINALLY); } // CFA |
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[3848e0e] | 212 | float { KEYWORD_RETURN(FLOAT); } |
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[b87a5ed] | 213 | __float128 { KEYWORD_RETURN(FLOAT); } // GCC |
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| 214 | for { KEYWORD_RETURN(FOR); } |
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| 215 | forall { KEYWORD_RETURN(FORALL); } // CFA |
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[3848e0e] | 216 | fortran { KEYWORD_RETURN(FORTRAN); } |
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[b87a5ed] | 217 | ftype { KEYWORD_RETURN(FTYPE); } // CFA |
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| 218 | _Generic { KEYWORD_RETURN(GENERIC); } // C11 |
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[3848e0e] | 219 | goto { KEYWORD_RETURN(GOTO); } |
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[b87a5ed] | 220 | if { KEYWORD_RETURN(IF); } |
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| 221 | _Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99 |
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| 222 | __imag { KEYWORD_RETURN(IMAGINARY); } // GCC |
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| 223 | __imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC |
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| 224 | inline { KEYWORD_RETURN(INLINE); } // C99 |
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| 225 | __inline { KEYWORD_RETURN(INLINE); } // GCC |
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| 226 | __inline__ { KEYWORD_RETURN(INLINE); } // GCC |
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| 227 | int { KEYWORD_RETURN(INT); } |
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| 228 | __int128 { KEYWORD_RETURN(INT); } // GCC |
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| 229 | __label__ { KEYWORD_RETURN(LABEL); } // GCC |
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[3848e0e] | 230 | long { KEYWORD_RETURN(LONG); } |
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[b87a5ed] | 231 | lvalue { KEYWORD_RETURN(LVALUE); } // CFA |
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| 232 | _Noreturn { KEYWORD_RETURN(NORETURN); } // C11 |
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[3848e0e] | 233 | register { KEYWORD_RETURN(REGISTER); } |
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[b87a5ed] | 234 | restrict { KEYWORD_RETURN(RESTRICT); } // C99 |
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| 235 | __restrict { KEYWORD_RETURN(RESTRICT); } // GCC |
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| 236 | __restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC |
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[3848e0e] | 237 | return { KEYWORD_RETURN(RETURN); } |
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| 238 | short { KEYWORD_RETURN(SHORT); } |
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| 239 | signed { KEYWORD_RETURN(SIGNED); } |
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[b87a5ed] | 240 | __signed { KEYWORD_RETURN(SIGNED); } // GCC |
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| 241 | __signed__ { KEYWORD_RETURN(SIGNED); } // GCC |
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[3848e0e] | 242 | sizeof { KEYWORD_RETURN(SIZEOF); } |
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| 243 | static { KEYWORD_RETURN(STATIC); } |
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[b87a5ed] | 244 | _Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11 |
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[3848e0e] | 245 | struct { KEYWORD_RETURN(STRUCT); } |
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| 246 | switch { KEYWORD_RETURN(SWITCH); } |
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[b87a5ed] | 247 | _Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11 |
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| 248 | throw { KEYWORD_RETURN(THROW); } // CFA |
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| 249 | try { KEYWORD_RETURN(TRY); } // CFA |
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| 250 | type { KEYWORD_RETURN(TYPE); } // CFA |
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[3848e0e] | 251 | typedef { KEYWORD_RETURN(TYPEDEF); } |
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[b87a5ed] | 252 | typeof { KEYWORD_RETURN(TYPEOF); } // GCC |
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| 253 | __typeof { KEYWORD_RETURN(TYPEOF); } // GCC |
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| 254 | __typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC |
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[3848e0e] | 255 | union { KEYWORD_RETURN(UNION); } |
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| 256 | unsigned { KEYWORD_RETURN(UNSIGNED); } |
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| 257 | void { KEYWORD_RETURN(VOID); } |
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| 258 | volatile { KEYWORD_RETURN(VOLATILE); } |
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[b87a5ed] | 259 | __volatile { KEYWORD_RETURN(VOLATILE); } // GCC |
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| 260 | __volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC |
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[3848e0e] | 261 | while { KEYWORD_RETURN(WHILE); } |
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[51b7345] | 262 | |
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[b87a5ed] | 263 | /* identifier */ |
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| 264 | {identifier} { IDENTIFIER_RETURN(); } |
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| 265 | {attr_identifier} { ATTRIBUTE_RETURN(); } |
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[3848e0e] | 266 | "`" { BEGIN BKQUOTE; } |
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[b87a5ed] | 267 | <BKQUOTE>{identifier} { IDENTIFIER_RETURN(); } |
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| 268 | <BKQUOTE>"`" { BEGIN 0; } |
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[51b7345] | 269 | |
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[b87a5ed] | 270 | /* numeric constants */ |
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| 271 | "0" { NUMERIC_RETURN(ZERO); } // CFA |
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| 272 | "1" { NUMERIC_RETURN(ONE); } // CFA |
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[59db689] | 273 | {decimal_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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| 274 | {octal_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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| 275 | {hex_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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[3848e0e] | 276 | {floating_constant} { NUMERIC_RETURN(FLOATINGconstant); } |
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| 277 | {hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); } |
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[51b7345] | 278 | |
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[b87a5ed] | 279 | /* character constant, allows empty value */ |
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[59db689] | 280 | ({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new std::string; *strtext += std::string( yytext ); } |
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[b87a5ed] | 281 | <QUOTE>[^'\\\n]* { *strtext += std::string( yytext ); } |
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| 282 | <QUOTE>['\n] { BEGIN 0; *strtext += std::string( yytext); RETURN_STR(CHARACTERconstant); } |
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| 283 | /* ' stop highlighting */ |
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[51b7345] | 284 | |
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[b87a5ed] | 285 | /* string constant */ |
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[59db689] | 286 | ({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new std::string; *strtext += std::string( yytext ); } |
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[b87a5ed] | 287 | <STRING>[^"\\\n]* { *strtext += std::string( yytext ); } |
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[59db689] | 288 | <STRING>["\n] { BEGIN 0; *strtext += std::string( yytext ); RETURN_STR(STRINGliteral); } |
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[b87a5ed] | 289 | /* " stop highlighting */ |
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[51b7345] | 290 | |
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[59db689] | 291 | /* common character/string constant */ |
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[3848e0e] | 292 | <QUOTE,STRING>{escape_seq} { rm_underscore(); *strtext += std::string( yytext ); } |
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[cd623a4] | 293 | <QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP) |
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[59db689] | 294 | <QUOTE,STRING>"\\" { *strtext += std::string( yytext ); } // unknown escape character |
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[3848e0e] | 295 | |
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[b87a5ed] | 296 | /* punctuation */ |
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| 297 | "[" { ASCIIOP_RETURN(); } |
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| 298 | "]" { ASCIIOP_RETURN(); } |
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| 299 | "(" { ASCIIOP_RETURN(); } |
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| 300 | ")" { ASCIIOP_RETURN(); } |
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| 301 | "{" { ASCIIOP_RETURN(); } |
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| 302 | "}" { ASCIIOP_RETURN(); } |
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| 303 | "," { ASCIIOP_RETURN(); } // also operator |
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| 304 | ":" { ASCIIOP_RETURN(); } |
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| 305 | ";" { ASCIIOP_RETURN(); } |
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| 306 | "." { ASCIIOP_RETURN(); } // also operator |
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[3848e0e] | 307 | "..." { NAMEDOP_RETURN(ELLIPSIS); } |
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| 308 | |
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[b87a5ed] | 309 | /* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */ |
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[3848e0e] | 310 | "<:" { RETURN_VAL('['); } |
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| 311 | ":>" { RETURN_VAL(']'); } |
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| 312 | "<%" { RETURN_VAL('{'); } |
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| 313 | "%>" { RETURN_VAL('}'); } |
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[51b7345] | 314 | |
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[b87a5ed] | 315 | /* operators */ |
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| 316 | "!" { ASCIIOP_RETURN(); } |
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| 317 | "+" { ASCIIOP_RETURN(); } |
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| 318 | "-" { ASCIIOP_RETURN(); } |
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| 319 | "*" { ASCIIOP_RETURN(); } |
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| 320 | "/" { ASCIIOP_RETURN(); } |
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| 321 | "%" { ASCIIOP_RETURN(); } |
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| 322 | "^" { ASCIIOP_RETURN(); } |
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| 323 | "~" { ASCIIOP_RETURN(); } |
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| 324 | "&" { ASCIIOP_RETURN(); } |
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| 325 | "|" { ASCIIOP_RETURN(); } |
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| 326 | "<" { ASCIIOP_RETURN(); } |
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| 327 | ">" { ASCIIOP_RETURN(); } |
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| 328 | "=" { ASCIIOP_RETURN(); } |
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| 329 | "?" { ASCIIOP_RETURN(); } |
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[3848e0e] | 330 | |
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| 331 | "++" { NAMEDOP_RETURN(ICR); } |
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| 332 | "--" { NAMEDOP_RETURN(DECR); } |
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| 333 | "==" { NAMEDOP_RETURN(EQ); } |
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| 334 | "!=" { NAMEDOP_RETURN(NE); } |
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| 335 | "<<" { NAMEDOP_RETURN(LS); } |
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| 336 | ">>" { NAMEDOP_RETURN(RS); } |
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| 337 | "<=" { NAMEDOP_RETURN(LE); } |
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| 338 | ">=" { NAMEDOP_RETURN(GE); } |
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| 339 | "&&" { NAMEDOP_RETURN(ANDAND); } |
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| 340 | "||" { NAMEDOP_RETURN(OROR); } |
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| 341 | "->" { NAMEDOP_RETURN(ARROW); } |
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| 342 | "+=" { NAMEDOP_RETURN(PLUSassign); } |
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| 343 | "-=" { NAMEDOP_RETURN(MINUSassign); } |
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| 344 | "*=" { NAMEDOP_RETURN(MULTassign); } |
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| 345 | "/=" { NAMEDOP_RETURN(DIVassign); } |
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| 346 | "%=" { NAMEDOP_RETURN(MODassign); } |
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| 347 | "&=" { NAMEDOP_RETURN(ANDassign); } |
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| 348 | "|=" { NAMEDOP_RETURN(ORassign); } |
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| 349 | "^=" { NAMEDOP_RETURN(ERassign); } |
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| 350 | "<<=" { NAMEDOP_RETURN(LSassign); } |
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| 351 | ">>=" { NAMEDOP_RETURN(RSassign); } |
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[51b7345] | 352 | |
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[b87a5ed] | 353 | /* CFA, operator identifier */ |
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| 354 | {op_unary}"?" { IDENTIFIER_RETURN(); } // unary |
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[a61fea9a] | 355 | "?"({op_unary_pre_post}|"()"|"[?]"|"{}") { IDENTIFIER_RETURN(); } |
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[b87a5ed] | 356 | "?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary |
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[51b7345] | 357 | /* |
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[b87a5ed] | 358 | This rule handles ambiguous cases with operator identifiers, e.g., "int *?*?()", where the string "*?*?" |
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| 359 | can be lexed as "*"/"?*?" or "*?"/"*?". Since it is common practise to put a unary operator juxtaposed |
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| 360 | to an identifier, e.g., "*i", users will be annoyed if they cannot do this with respect to operator |
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| 361 | identifiers. Even with this special hack, there are 5 general cases that cannot be handled. The first |
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| 362 | case is for the function-call identifier "?()": |
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[51b7345] | 363 | |
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| 364 | int * ?()(); // declaration: space required after '*' |
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| 365 | * ?()(); // expression: space required after '*' |
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| 366 | |
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[b87a5ed] | 367 | Without the space, the string "*?()" is ambiguous without N character look ahead; it requires scanning |
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| 368 | ahead to determine if there is a '(', which is the start of an argument/parameter list. |
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[51b7345] | 369 | |
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| 370 | The 4 remaining cases occur in expressions: |
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| 371 | |
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| 372 | i++?i:0; // space required before '?' |
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| 373 | i--?i:0; // space required before '?' |
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| 374 | i?++i:0; // space required after '?' |
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| 375 | i?--i:0; // space required after '?' |
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| 376 | |
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[b87a5ed] | 377 | In the first two cases, the string "i++?" is ambiguous, where this string can be lexed as "i"/"++?" or |
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| 378 | "i++"/"?"; it requires scanning ahead to determine if there is a '(', which is the start of an argument |
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| 379 | list. In the second two cases, the string "?++x" is ambiguous, where this string can be lexed as |
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| 380 | "?++"/"x" or "?"/"++x"; it requires scanning ahead to determine if there is a '(', which is the start of |
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| 381 | an argument list. |
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[51b7345] | 382 | */ |
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| 383 | {op_unary}"?"(({op_unary_pre_post}|"[?]")|({op_binary_over}"?")) { |
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[b87a5ed] | 384 | // 1 or 2 character unary operator ? |
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| 385 | int i = yytext[1] == '?' ? 1 : 2; |
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| 386 | yyless( i ); // put back characters up to first '?' |
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| 387 | if ( i > 1 ) { |
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| 388 | NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR ); |
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| 389 | } else { |
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| 390 | ASCIIOP_RETURN(); |
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| 391 | } // if |
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| 392 | } |
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| 393 | |
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| 394 | /* unknown characters */ |
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[3848e0e] | 395 | . { printf("unknown character(s):\"%s\" on line %d\n", yytext, yylineno); } |
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[51b7345] | 396 | |
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| 397 | %% |
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| 398 | |
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[b87a5ed] | 399 | // Local Variables: // |
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| 400 | // mode: c++ // |
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[de62360d] | 401 | // tab-width: 4 // |
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[b87a5ed] | 402 | // compile-command: "make install" // |
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| 403 | // End: // |
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