[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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[8f60f0b] | 6 | * |
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[6016c87] | 7 | * lex.ll -- |
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[8f60f0b] | 8 | * |
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[51b7345] | 9 | * Author : Peter A. Buhr |
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| 10 | * Created On : Sat Sep 22 08:58:10 2001 |
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[926af74] | 11 | * Last Modified By : Peter A. Buhr |
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[a2e0687] | 12 | * Last Modified On : Thu Jul 27 21:46:06 2017 |
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| 13 | * Update Count : 550 |
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[51b7345] | 14 | */ |
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| 15 | |
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| 16 | %option yylineno |
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[4e9c7c1] | 17 | %option noyywrap |
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[5f2f2d7] | 18 | %option nounput |
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[51b7345] | 19 | |
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| 20 | %{ |
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[de62360d] | 21 | // This lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive have been |
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| 22 | // performed and removed from the source. The only exceptions are preprocessor directives passed to the compiler (e.g., |
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| 23 | // line-number directives) and C/C++ style comments, which are ignored. |
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[51b7345] | 24 | |
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[8c17ab0] | 25 | //**************************** Includes and Defines **************************** |
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[51b7345] | 26 | |
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| 27 | #include <string> |
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[f487962] | 28 | #include <cstdio> // FILENAME_MAX |
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[51b7345] | 29 | |
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[984dce6] | 30 | #include "ParseNode.h" |
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| 31 | #include "TypedefTable.h" |
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[51b7345] | 32 | |
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| 33 | char *yyfilename; |
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[b87a5ed] | 34 | std::string *strtext; // accumulate parts of character and string constant value |
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[51b7345] | 35 | |
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[de62360d] | 36 | #define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x ) |
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| 37 | #define RETURN_VAL(x) yylval.tok.str = new std::string( yytext ); RETURN_LOCN( x ) |
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[926af74] | 38 | #define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x ) |
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[de62360d] | 39 | #define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x ) |
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[5f2f2d7] | 40 | |
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[f487962] | 41 | #define WHITE_RETURN(x) // do nothing |
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[de62360d] | 42 | #define NEWLINE_RETURN() WHITE_RETURN( '\n' ) |
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| 43 | #define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator |
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[f487962] | 44 | #define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name |
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[de62360d] | 45 | #define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant |
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| 46 | #define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword |
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[984dce6] | 47 | #define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) ) |
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[de62360d] | 48 | #define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER ) |
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[51b7345] | 49 | |
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[3848e0e] | 50 | void rm_underscore() { |
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[e7aed49] | 51 | // Remove underscores in numeric constant by copying the non-underscore characters to the front of the string. |
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| 52 | yyleng = 0; |
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[b87a5ed] | 53 | for ( int i = 0; yytext[i] != '\0'; i += 1 ) { |
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| 54 | if ( yytext[i] != '_' ) { |
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[e7aed49] | 55 | yytext[yyleng] = yytext[i]; |
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| 56 | yyleng += 1; |
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[b87a5ed] | 57 | } // if |
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| 58 | } // for |
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| 59 | yytext[yyleng] = '\0'; |
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[51b7345] | 60 | } |
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| 61 | |
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[7812f1d1] | 62 | // Stop warning due to incorrectly generated flex code. |
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| 63 | #pragma GCC diagnostic ignored "-Wsign-compare" |
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[51b7345] | 64 | %} |
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| 65 | |
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| 66 | octal [0-7] |
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| 67 | nonzero [1-9] |
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| 68 | decimal [0-9] |
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| 69 | hex [0-9a-fA-F] |
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[3848e0e] | 70 | universal_char "\\"((u"_"?{hex_quad})|(U"_"?{hex_quad}{2})) |
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[51b7345] | 71 | |
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[b87a5ed] | 72 | // identifier, GCC: $ in identifier |
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[51b7345] | 73 | identifier ([a-zA-Z_$]|{universal_char})([0-9a-zA-Z_$]|{universal_char})* |
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| 74 | |
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[b87a5ed] | 75 | // attribute identifier, GCC: $ in identifier |
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[51b7345] | 76 | attr_identifier "@"{identifier} |
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| 77 | |
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[b87a5ed] | 78 | // numeric constants, CFA: '_' in constant |
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[3848e0e] | 79 | hex_quad {hex}("_"?{hex}){3} |
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[ba2356b] | 80 | integer_suffix "_"?(([uU](("ll"|"LL"|[lL])[iI]|[iI]?("ll"|"LL"|[lL])?))|([iI](("ll"|"LL"|[lL])[uU]|[uU]?("ll"|"LL"|[lL])?))|(("ll"|"LL"|[lL])([iI][uU]|[uU]?[iI]?))) |
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[51b7345] | 81 | |
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| 82 | octal_digits ({octal})|({octal}({octal}|"_")*{octal}) |
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| 83 | octal_prefix "0""_"? |
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| 84 | octal_constant (("0")|({octal_prefix}{octal_digits})){integer_suffix}? |
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| 85 | |
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| 86 | nonzero_digits ({nonzero})|({nonzero}({decimal}|"_")*{decimal}) |
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| 87 | decimal_constant {nonzero_digits}{integer_suffix}? |
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| 88 | |
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| 89 | hex_digits ({hex})|({hex}({hex}|"_")*{hex}) |
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| 90 | hex_prefix "0"[xX]"_"? |
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| 91 | hex_constant {hex_prefix}{hex_digits}{integer_suffix}? |
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| 92 | |
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| 93 | decimal_digits ({decimal})|({decimal}({decimal}|"_")*{decimal}) |
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[0213af6] | 94 | real_decimal {decimal_digits}"."{exponent}?{floating_suffix}? |
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| 95 | real_fraction "."{decimal_digits}{exponent}?{floating_suffix}? |
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| 96 | real_constant {decimal_digits}{real_fraction} |
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[51b7345] | 97 | exponent "_"?[eE]"_"?[+-]?{decimal_digits} |
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[ba2356b] | 98 | // GCC: D (double) and iI (imaginary) suffixes, and DL (long double) |
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| 99 | floating_suffix "_"?([fFdDlL][iI]?|[iI][lLfFdD]?|"DL") |
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[1b29996] | 100 | floating_constant (({real_constant}{exponent}?)|({decimal_digits}{exponent})){floating_suffix}? |
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[51b7345] | 101 | |
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| 102 | binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits} |
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| 103 | hex_fractional_constant ({hex_digits}?"."{hex_digits})|({hex_digits}".") |
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| 104 | hex_floating_constant {hex_prefix}(({hex_fractional_constant}{binary_exponent})|({hex_digits}{binary_exponent})){floating_suffix}? |
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| 105 | |
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[b87a5ed] | 106 | // character escape sequence, GCC: \e => esc character |
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[51b7345] | 107 | simple_escape "\\"[abefnrtv'"?\\] |
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[b87a5ed] | 108 | // ' stop highlighting |
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[3848e0e] | 109 | octal_escape "\\"{octal}("_"?{octal}){0,2} |
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| 110 | hex_escape "\\""x""_"?{hex_digits} |
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[51b7345] | 111 | escape_seq {simple_escape}|{octal_escape}|{hex_escape}|{universal_char} |
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[59db689] | 112 | cwide_prefix "L"|"U"|"u" |
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| 113 | swide_prefix {cwide_prefix}|"u8" |
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[51b7345] | 114 | |
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[b87a5ed] | 115 | // display/white-space characters |
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[51b7345] | 116 | h_tab [\011] |
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| 117 | form_feed [\014] |
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| 118 | v_tab [\013] |
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| 119 | c_return [\015] |
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| 120 | h_white [ ]|{h_tab} |
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| 121 | |
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[e7aed49] | 122 | // overloadable operators |
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[51b7345] | 123 | op_unary_only "~"|"!" |
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| 124 | op_unary_binary "+"|"-"|"*" |
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| 125 | op_unary_pre_post "++"|"--" |
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| 126 | op_unary {op_unary_only}|{op_unary_binary}|{op_unary_pre_post} |
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| 127 | |
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[994d080] | 128 | op_binary_only "/"|"%"|"\\"|"^"|"&"|"|"|"<"|">"|"="|"=="|"!="|"<<"|">>"|"<="|">="|"+="|"-="|"*="|"/="|"%="|"\\="|"&="|"|="|"^="|"<<="|">>=" |
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[51b7345] | 129 | op_binary_over {op_unary_binary}|{op_binary_only} |
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[e7aed49] | 130 | // op_binary_not_over "?"|"->"|"."|"&&"|"||"|"@=" |
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| 131 | // operator {op_unary_pre_post}|{op_binary_over}|{op_binary_not_over} |
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[51b7345] | 132 | |
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| 133 | %x COMMENT |
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[3848e0e] | 134 | %x BKQUOTE |
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| 135 | %x QUOTE |
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| 136 | %x STRING |
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[51b7345] | 137 | |
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| 138 | %% |
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[994d080] | 139 | /* line directives */ |
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[4040425] | 140 | ^{h_white}*"#"{h_white}*[0-9]+{h_white}*["][^"\n]+["].*"\n" { |
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[8c17ab0] | 141 | /* " stop highlighting */ |
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[c1c1112] | 142 | static char filename[FILENAME_MAX]; // temporarily store current source-file name |
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[51b7345] | 143 | char *end_num; |
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| 144 | char *begin_string, *end_string; |
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| 145 | long lineno, length; |
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| 146 | lineno = strtol( yytext + 1, &end_num, 0 ); |
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| 147 | begin_string = strchr( end_num, '"' ); |
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[f487962] | 148 | if ( begin_string ) { // file name ? |
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| 149 | end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter |
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| 150 | assert( end_string ); // closing quote ? |
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| 151 | length = end_string - begin_string - 1; // file-name length without quotes or sentinel |
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| 152 | assert( length < FILENAME_MAX ); // room for sentinel ? |
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| 153 | memcpy( &filename, begin_string + 1, length ); // copy file name from yytext |
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| 154 | filename[ length ] = '\0'; // terminate string with sentinel |
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| 155 | //std::cout << "file " << filename << " line " << lineno << std::endl; |
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| 156 | yylineno = lineno; |
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[c1c1112] | 157 | yyfilename = filename; |
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[b87a5ed] | 158 | } // if |
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[51b7345] | 159 | } |
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| 160 | |
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[b87a5ed] | 161 | /* ignore preprocessor directives (for now) */ |
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[51b7345] | 162 | ^{h_white}*"#"[^\n]*"\n" ; |
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| 163 | |
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[cd623a4] | 164 | /* ignore C style comments (ALSO HANDLED BY CPP) */ |
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[3848e0e] | 165 | "/*" { BEGIN COMMENT; } |
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[cd623a4] | 166 | <COMMENT>.|\n ; |
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| 167 | <COMMENT>"*/" { BEGIN 0; } |
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[51b7345] | 168 | |
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[cd623a4] | 169 | /* ignore C++ style comments (ALSO HANDLED BY CPP) */ |
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| 170 | "//"[^\n]*"\n" ; |
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[51b7345] | 171 | |
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[b87a5ed] | 172 | /* ignore whitespace */ |
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[3848e0e] | 173 | {h_white}+ { WHITE_RETURN(' '); } |
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| 174 | ({v_tab}|{c_return}|{form_feed})+ { WHITE_RETURN(' '); } |
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| 175 | ({h_white}|{v_tab}|{c_return}|{form_feed})*"\n" { NEWLINE_RETURN(); } |
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[51b7345] | 176 | |
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[b87a5ed] | 177 | /* keywords */ |
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| 178 | _Alignas { KEYWORD_RETURN(ALIGNAS); } // C11 |
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| 179 | _Alignof { KEYWORD_RETURN(ALIGNOF); } // C11 |
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| 180 | __alignof { KEYWORD_RETURN(ALIGNOF); } // GCC |
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| 181 | __alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC |
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| 182 | asm { KEYWORD_RETURN(ASM); } |
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| 183 | __asm { KEYWORD_RETURN(ASM); } // GCC |
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| 184 | __asm__ { KEYWORD_RETURN(ASM); } // GCC |
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[02e5ab6] | 185 | _At { KEYWORD_RETURN(AT); } // CFA |
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[b87a5ed] | 186 | _Atomic { KEYWORD_RETURN(ATOMIC); } // C11 |
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| 187 | __attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC |
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| 188 | __attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC |
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[3848e0e] | 189 | auto { KEYWORD_RETURN(AUTO); } |
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[b87a5ed] | 190 | _Bool { KEYWORD_RETURN(BOOL); } // C99 |
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[3848e0e] | 191 | break { KEYWORD_RETURN(BREAK); } |
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| 192 | case { KEYWORD_RETURN(CASE); } |
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[b87a5ed] | 193 | catch { KEYWORD_RETURN(CATCH); } // CFA |
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[02e5ab6] | 194 | catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA |
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[3848e0e] | 195 | char { KEYWORD_RETURN(CHAR); } |
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[b87a5ed] | 196 | choose { KEYWORD_RETURN(CHOOSE); } // CFA |
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| 197 | _Complex { KEYWORD_RETURN(COMPLEX); } // C99 |
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| 198 | __complex { KEYWORD_RETURN(COMPLEX); } // GCC |
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| 199 | __complex__ { KEYWORD_RETURN(COMPLEX); } // GCC |
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[3848e0e] | 200 | const { KEYWORD_RETURN(CONST); } |
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[b87a5ed] | 201 | __const { KEYWORD_RETURN(CONST); } // GCC |
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| 202 | __const__ { KEYWORD_RETURN(CONST); } // GCC |
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[3848e0e] | 203 | continue { KEYWORD_RETURN(CONTINUE); } |
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[e04b636] | 204 | coroutine { KEYWORD_RETURN(COROUTINE); } // CFA |
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[3848e0e] | 205 | default { KEYWORD_RETURN(DEFAULT); } |
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[02e5ab6] | 206 | disable { KEYWORD_RETURN(DISABLE); } // CFA |
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[b87a5ed] | 207 | do { KEYWORD_RETURN(DO); } |
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[3848e0e] | 208 | double { KEYWORD_RETURN(DOUBLE); } |
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[b87a5ed] | 209 | dtype { KEYWORD_RETURN(DTYPE); } // CFA |
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[3848e0e] | 210 | else { KEYWORD_RETURN(ELSE); } |
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[02e5ab6] | 211 | enable { KEYWORD_RETURN(ENABLE); } // CFA |
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[3848e0e] | 212 | enum { KEYWORD_RETURN(ENUM); } |
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[b87a5ed] | 213 | __extension__ { KEYWORD_RETURN(EXTENSION); } // GCC |
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[3848e0e] | 214 | extern { KEYWORD_RETURN(EXTERN); } |
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[08061589] | 215 | fallthrough { KEYWORD_RETURN(FALLTHRU); } // CFA |
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[b87a5ed] | 216 | fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA |
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| 217 | finally { KEYWORD_RETURN(FINALLY); } // CFA |
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[3848e0e] | 218 | float { KEYWORD_RETURN(FLOAT); } |
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[b87a5ed] | 219 | __float128 { KEYWORD_RETURN(FLOAT); } // GCC |
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| 220 | for { KEYWORD_RETURN(FOR); } |
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| 221 | forall { KEYWORD_RETURN(FORALL); } // CFA |
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[3848e0e] | 222 | fortran { KEYWORD_RETURN(FORTRAN); } |
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[b87a5ed] | 223 | ftype { KEYWORD_RETURN(FTYPE); } // CFA |
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| 224 | _Generic { KEYWORD_RETURN(GENERIC); } // C11 |
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[3848e0e] | 225 | goto { KEYWORD_RETURN(GOTO); } |
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[b87a5ed] | 226 | if { KEYWORD_RETURN(IF); } |
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| 227 | _Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99 |
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| 228 | __imag { KEYWORD_RETURN(IMAGINARY); } // GCC |
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| 229 | __imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC |
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| 230 | inline { KEYWORD_RETURN(INLINE); } // C99 |
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| 231 | __inline { KEYWORD_RETURN(INLINE); } // GCC |
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| 232 | __inline__ { KEYWORD_RETURN(INLINE); } // GCC |
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| 233 | int { KEYWORD_RETURN(INT); } |
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| 234 | __int128 { KEYWORD_RETURN(INT); } // GCC |
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[b15f6cf] | 235 | __int128_t { KEYWORD_RETURN(INT); } // GCC |
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[b87a5ed] | 236 | __label__ { KEYWORD_RETURN(LABEL); } // GCC |
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[3848e0e] | 237 | long { KEYWORD_RETURN(LONG); } |
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[b87a5ed] | 238 | lvalue { KEYWORD_RETURN(LVALUE); } // CFA |
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[6016c87] | 239 | monitor { KEYWORD_RETURN(MONITOR); } // CFA |
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[a7c90d4] | 240 | mutex { KEYWORD_RETURN(MUTEX); } // CFA |
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[b87a5ed] | 241 | _Noreturn { KEYWORD_RETURN(NORETURN); } // C11 |
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[5721a6d] | 242 | __builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC |
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[3a2128f] | 243 | one_t { NUMERIC_RETURN(ONE_T); } // CFA |
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[4040425] | 244 | otype { KEYWORD_RETURN(OTYPE); } // CFA |
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[3848e0e] | 245 | register { KEYWORD_RETURN(REGISTER); } |
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[b87a5ed] | 246 | restrict { KEYWORD_RETURN(RESTRICT); } // C99 |
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| 247 | __restrict { KEYWORD_RETURN(RESTRICT); } // GCC |
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| 248 | __restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC |
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[3848e0e] | 249 | return { KEYWORD_RETURN(RETURN); } |
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| 250 | short { KEYWORD_RETURN(SHORT); } |
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| 251 | signed { KEYWORD_RETURN(SIGNED); } |
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[b87a5ed] | 252 | __signed { KEYWORD_RETURN(SIGNED); } // GCC |
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| 253 | __signed__ { KEYWORD_RETURN(SIGNED); } // GCC |
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[3848e0e] | 254 | sizeof { KEYWORD_RETURN(SIZEOF); } |
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| 255 | static { KEYWORD_RETURN(STATIC); } |
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[b87a5ed] | 256 | _Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11 |
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[3848e0e] | 257 | struct { KEYWORD_RETURN(STRUCT); } |
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| 258 | switch { KEYWORD_RETURN(SWITCH); } |
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[bd4d011] | 259 | thread { KEYWORD_RETURN(THREAD); } // C11 |
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[b87a5ed] | 260 | _Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11 |
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| 261 | throw { KEYWORD_RETURN(THROW); } // CFA |
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[02e5ab6] | 262 | throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA |
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[4040425] | 263 | trait { KEYWORD_RETURN(TRAIT); } // CFA |
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[b87a5ed] | 264 | try { KEYWORD_RETURN(TRY); } // CFA |
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[8f60f0b] | 265 | ttype { KEYWORD_RETURN(TTYPE); } // CFA |
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[3848e0e] | 266 | typedef { KEYWORD_RETURN(TYPEDEF); } |
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[b87a5ed] | 267 | typeof { KEYWORD_RETURN(TYPEOF); } // GCC |
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| 268 | __typeof { KEYWORD_RETURN(TYPEOF); } // GCC |
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| 269 | __typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC |
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[b15f6cf] | 270 | __uint128_t { KEYWORD_RETURN(INT); } // GCC |
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[3848e0e] | 271 | union { KEYWORD_RETURN(UNION); } |
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| 272 | unsigned { KEYWORD_RETURN(UNSIGNED); } |
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[90c3b1c] | 273 | __builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC |
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[72457b6] | 274 | virtual { KEYWORD_RETURN(VIRTUAL); } // CFA |
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[3848e0e] | 275 | void { KEYWORD_RETURN(VOID); } |
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| 276 | volatile { KEYWORD_RETURN(VOLATILE); } |
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[b87a5ed] | 277 | __volatile { KEYWORD_RETURN(VOLATILE); } // GCC |
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| 278 | __volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC |
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[3848e0e] | 279 | while { KEYWORD_RETURN(WHILE); } |
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[8b47e50] | 280 | with { KEYWORD_RETURN(WITH); } // CFA |
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[3a2128f] | 281 | zero_t { NUMERIC_RETURN(ZERO_T); } // CFA |
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[51b7345] | 282 | |
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[b87a5ed] | 283 | /* identifier */ |
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| 284 | {identifier} { IDENTIFIER_RETURN(); } |
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| 285 | {attr_identifier} { ATTRIBUTE_RETURN(); } |
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[c6b1105] | 286 | "`" { BEGIN BKQUOTE; } |
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[b87a5ed] | 287 | <BKQUOTE>{identifier} { IDENTIFIER_RETURN(); } |
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| 288 | <BKQUOTE>"`" { BEGIN 0; } |
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[51b7345] | 289 | |
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[b87a5ed] | 290 | /* numeric constants */ |
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[59db689] | 291 | {decimal_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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| 292 | {octal_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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| 293 | {hex_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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[1b29996] | 294 | {real_decimal} { NUMERIC_RETURN(REALDECIMALconstant); } // must appear before floating_constant |
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| 295 | {real_fraction} { NUMERIC_RETURN(REALFRACTIONconstant); } // must appear before floating_constant |
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[3848e0e] | 296 | {floating_constant} { NUMERIC_RETURN(FLOATINGconstant); } |
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| 297 | {hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); } |
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[51b7345] | 298 | |
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[b87a5ed] | 299 | /* character constant, allows empty value */ |
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[c1c1112] | 300 | ({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new std::string( yytext, yyleng ); } |
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| 301 | <QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); } |
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| 302 | <QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); } |
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[b87a5ed] | 303 | /* ' stop highlighting */ |
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[51b7345] | 304 | |
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[b87a5ed] | 305 | /* string constant */ |
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[c1c1112] | 306 | ({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new std::string( yytext, yyleng ); } |
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| 307 | <STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); } |
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| 308 | <STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); } |
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[b87a5ed] | 309 | /* " stop highlighting */ |
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[51b7345] | 310 | |
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[59db689] | 311 | /* common character/string constant */ |
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[c1c1112] | 312 | <QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); } |
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[cd623a4] | 313 | <QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP) |
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[c1c1112] | 314 | <QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character |
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[3848e0e] | 315 | |
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[b87a5ed] | 316 | /* punctuation */ |
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[615a096] | 317 | "@" { ASCIIOP_RETURN(); } |
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[b87a5ed] | 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(); } // also operator |
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| 325 | ":" { ASCIIOP_RETURN(); } |
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| 326 | ";" { ASCIIOP_RETURN(); } |
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| 327 | "." { ASCIIOP_RETURN(); } // also operator |
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[3848e0e] | 328 | "..." { NAMEDOP_RETURN(ELLIPSIS); } |
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| 329 | |
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[b87a5ed] | 330 | /* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */ |
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[3848e0e] | 331 | "<:" { RETURN_VAL('['); } |
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| 332 | ":>" { RETURN_VAL(']'); } |
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| 333 | "<%" { RETURN_VAL('{'); } |
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| 334 | "%>" { RETURN_VAL('}'); } |
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[51b7345] | 335 | |
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[b87a5ed] | 336 | /* operators */ |
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| 337 | "!" { ASCIIOP_RETURN(); } |
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| 338 | "+" { ASCIIOP_RETURN(); } |
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| 339 | "-" { ASCIIOP_RETURN(); } |
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| 340 | "*" { ASCIIOP_RETURN(); } |
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[e5f2a67] | 341 | "\\" { ASCIIOP_RETURN(); } // CFA, exponentiation |
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[b87a5ed] | 342 | "/" { ASCIIOP_RETURN(); } |
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| 343 | "%" { ASCIIOP_RETURN(); } |
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| 344 | "^" { ASCIIOP_RETURN(); } |
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| 345 | "~" { ASCIIOP_RETURN(); } |
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| 346 | "&" { ASCIIOP_RETURN(); } |
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| 347 | "|" { ASCIIOP_RETURN(); } |
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| 348 | "<" { ASCIIOP_RETURN(); } |
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| 349 | ">" { ASCIIOP_RETURN(); } |
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| 350 | "=" { ASCIIOP_RETURN(); } |
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| 351 | "?" { ASCIIOP_RETURN(); } |
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[3848e0e] | 352 | |
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| 353 | "++" { NAMEDOP_RETURN(ICR); } |
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| 354 | "--" { NAMEDOP_RETURN(DECR); } |
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| 355 | "==" { NAMEDOP_RETURN(EQ); } |
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| 356 | "!=" { NAMEDOP_RETURN(NE); } |
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| 357 | "<<" { NAMEDOP_RETURN(LS); } |
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| 358 | ">>" { NAMEDOP_RETURN(RS); } |
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| 359 | "<=" { NAMEDOP_RETURN(LE); } |
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| 360 | ">=" { NAMEDOP_RETURN(GE); } |
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| 361 | "&&" { NAMEDOP_RETURN(ANDAND); } |
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| 362 | "||" { NAMEDOP_RETURN(OROR); } |
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| 363 | "->" { NAMEDOP_RETURN(ARROW); } |
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| 364 | "+=" { NAMEDOP_RETURN(PLUSassign); } |
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| 365 | "-=" { NAMEDOP_RETURN(MINUSassign); } |
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[e5f2a67] | 366 | "\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation |
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[3848e0e] | 367 | "*=" { NAMEDOP_RETURN(MULTassign); } |
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| 368 | "/=" { NAMEDOP_RETURN(DIVassign); } |
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| 369 | "%=" { NAMEDOP_RETURN(MODassign); } |
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| 370 | "&=" { NAMEDOP_RETURN(ANDassign); } |
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| 371 | "|=" { NAMEDOP_RETURN(ORassign); } |
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| 372 | "^=" { NAMEDOP_RETURN(ERassign); } |
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| 373 | "<<=" { NAMEDOP_RETURN(LSassign); } |
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| 374 | ">>=" { NAMEDOP_RETURN(RSassign); } |
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[51b7345] | 375 | |
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[08061589] | 376 | "@=" { NAMEDOP_RETURN(ATassign); } // CFA |
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[097e2b0] | 377 | |
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[b87a5ed] | 378 | /* CFA, operator identifier */ |
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| 379 | {op_unary}"?" { IDENTIFIER_RETURN(); } // unary |
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[a61fea9a] | 380 | "?"({op_unary_pre_post}|"()"|"[?]"|"{}") { IDENTIFIER_RETURN(); } |
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[02e5ab6] | 381 | "^?{}" { IDENTIFIER_RETURN(); } |
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[b87a5ed] | 382 | "?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary |
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[51b7345] | 383 | /* |
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[daf9671] | 384 | This rule handles ambiguous cases with operator identifiers, e.g., "int *?*?()", where the string "*?*?" can be |
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| 385 | lexed as "*?"/"*?" or "*"/"?*?". Since it is common practise to put a unary operator juxtaposed to an identifier, |
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| 386 | e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is |
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| 387 | a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then |
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| 388 | reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator |
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| 389 | identifier to disambiguate this common case. |
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| 390 | |
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| 391 | A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity |
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| 392 | occurs when the deference operator has no parameters, *?() and *?()(...), requiring arbitrary whitespace |
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| 393 | look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a |
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| 394 | parameter/argument to dereference *?(...). Hence, always interpreting the string *?() as * ?() does not preclude |
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| 395 | any meaningful program. |
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| 396 | |
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| 397 | The remaining cases are with the increment/decrement operators and conditional expression: |
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| 398 | |
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| 399 | i++? ...(...); |
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| 400 | i?++ ...(...); |
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| 401 | |
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| 402 | requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an |
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| 403 | incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a |
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| 404 | space: |
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| 405 | |
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| 406 | i++ ? i : 0; |
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| 407 | i? ++i : 0; |
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[51b7345] | 408 | */ |
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[daf9671] | 409 | {op_unary}"?"({op_unary_pre_post}|"()"|"[?]"|{op_binary_over}"?") { |
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[b87a5ed] | 410 | // 1 or 2 character unary operator ? |
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| 411 | int i = yytext[1] == '?' ? 1 : 2; |
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| 412 | yyless( i ); // put back characters up to first '?' |
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| 413 | if ( i > 1 ) { |
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| 414 | NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR ); |
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| 415 | } else { |
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| 416 | ASCIIOP_RETURN(); |
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| 417 | } // if |
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| 418 | } |
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| 419 | |
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| 420 | /* unknown characters */ |
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[a2e0687] | 421 | . { printf("unknown character(s):\"%s\" on line %d\n", yytext, yylineno); } |
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[51b7345] | 422 | |
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| 423 | %% |
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| 424 | |
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[b87a5ed] | 425 | // Local Variables: // |
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| 426 | // mode: c++ // |
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[de62360d] | 427 | // tab-width: 4 // |
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[b87a5ed] | 428 | // compile-command: "make install" // |
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| 429 | // End: // |
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