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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6 | * |
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7 | * lex.ll -- |
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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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12 | * Last Modified On : Sat Jul 15 08:31:47 2017 |
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13 | * Update Count : 541 |
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14 | */ |
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15 | |
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16 | %option yylineno |
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17 | %option nounput |
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18 | |
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19 | %{ |
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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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23 | |
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24 | //**************************** Includes and Defines **************************** |
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25 | |
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26 | #include <string> |
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27 | #include <cstdio> // FILENAME_MAX |
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28 | |
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29 | #include "ParseNode.h" |
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30 | #include "TypedefTable.h" |
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31 | |
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32 | char *yyfilename; |
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33 | std::string *strtext; // accumulate parts of character and string constant value |
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34 | |
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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 = nullptr; RETURN_LOCN( x ) |
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38 | #define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x ) |
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39 | |
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40 | #define WHITE_RETURN(x) // do nothing |
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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_CHAR( 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.isKind( yytext ) ) |
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47 | #define ATTRIBUTE_RETURN() RETURN_VAL( ATTR_IDENTIFIER ) |
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48 | |
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49 | void rm_underscore() { |
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50 | // Remove underscores in numeric constant by copying the non-underscore characters to the front of the string. |
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51 | yyleng = 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[yyleng] = yytext[i]; |
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55 | yyleng += 1; |
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56 | } // if |
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57 | } // for |
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58 | yytext[yyleng] = '\0'; |
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59 | } |
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60 | |
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61 | // Stop warning due to incorrectly generated flex code. |
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62 | #pragma GCC diagnostic ignored "-Wsign-compare" |
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63 | %} |
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64 | |
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65 | octal [0-7] |
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66 | nonzero [1-9] |
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67 | decimal [0-9] |
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68 | hex [0-9a-fA-F] |
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69 | universal_char "\\"((u"_"?{hex_quad})|(U"_"?{hex_quad}{2})) |
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70 | |
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71 | // identifier, GCC: $ in identifier |
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72 | identifier ([a-zA-Z_$]|{universal_char})([0-9a-zA-Z_$]|{universal_char})* |
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73 | |
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74 | // attribute identifier, GCC: $ in identifier |
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75 | attr_identifier "@"{identifier} |
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76 | |
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77 | // numeric constants, CFA: '_' in constant |
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78 | hex_quad {hex}("_"?{hex}){3} |
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79 | 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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80 | |
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81 | octal_digits ({octal})|({octal}({octal}|"_")*{octal}) |
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82 | octal_prefix "0""_"? |
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83 | octal_constant (("0")|({octal_prefix}{octal_digits})){integer_suffix}? |
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84 | |
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85 | nonzero_digits ({nonzero})|({nonzero}({decimal}|"_")*{decimal}) |
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86 | decimal_constant {nonzero_digits}{integer_suffix}? |
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87 | |
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88 | hex_digits ({hex})|({hex}({hex}|"_")*{hex}) |
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89 | hex_prefix "0"[xX]"_"? |
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90 | hex_constant {hex_prefix}{hex_digits}{integer_suffix}? |
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91 | |
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92 | decimal_digits ({decimal})|({decimal}({decimal}|"_")*{decimal}) |
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93 | real_decimal {decimal_digits}"."{exponent}?{floating_suffix}? |
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94 | real_fraction "."{decimal_digits}{exponent}?{floating_suffix}? |
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95 | real_constant {decimal_digits}{real_fraction} |
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96 | exponent "_"?[eE]"_"?[+-]?{decimal_digits} |
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97 | // GCC: D (double) and iI (imaginary) suffixes, and DL (long double) |
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98 | floating_suffix "_"?([fFdDlL][iI]?|[iI][lLfFdD]?|"DL") |
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99 | floating_constant (({real_constant}{exponent}?)|({decimal_digits}{exponent})){floating_suffix}? |
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100 | |
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101 | binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits} |
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102 | hex_fractional_constant ({hex_digits}?"."{hex_digits})|({hex_digits}".") |
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103 | hex_floating_constant {hex_prefix}(({hex_fractional_constant}{binary_exponent})|({hex_digits}{binary_exponent})){floating_suffix}? |
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104 | |
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105 | // character escape sequence, GCC: \e => esc character |
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106 | simple_escape "\\"[abefnrtv'"?\\] |
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107 | // ' stop highlighting |
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108 | octal_escape "\\"{octal}("_"?{octal}){0,2} |
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109 | hex_escape "\\""x""_"?{hex_digits} |
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110 | escape_seq {simple_escape}|{octal_escape}|{hex_escape}|{universal_char} |
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111 | cwide_prefix "L"|"U"|"u" |
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112 | swide_prefix {cwide_prefix}|"u8" |
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113 | |
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114 | // display/white-space characters |
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115 | h_tab [\011] |
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116 | form_feed [\014] |
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117 | v_tab [\013] |
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118 | c_return [\015] |
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119 | h_white [ ]|{h_tab} |
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120 | |
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121 | // overloadable operators |
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122 | op_unary_only "~"|"!" |
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123 | op_unary_binary "+"|"-"|"*" |
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124 | op_unary_pre_post "++"|"--" |
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125 | op_unary {op_unary_only}|{op_unary_binary}|{op_unary_pre_post} |
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126 | |
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127 | op_binary_only "/"|"%"|"\\"|"^"|"&"|"|"|"<"|">"|"="|"=="|"!="|"<<"|">>"|"<="|">="|"+="|"-="|"*="|"/="|"%="|"\\="|"&="|"|="|"^="|"<<="|">>=" |
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128 | op_binary_over {op_unary_binary}|{op_binary_only} |
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129 | // op_binary_not_over "?"|"->"|"."|"&&"|"||"|"@=" |
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130 | // operator {op_unary_pre_post}|{op_binary_over}|{op_binary_not_over} |
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131 | |
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132 | %x COMMENT |
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133 | %x BKQUOTE |
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134 | %x QUOTE |
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135 | %x STRING |
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136 | |
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137 | %% |
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138 | /* line directives */ |
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139 | ^{h_white}*"#"{h_white}*[0-9]+{h_white}*["][^"\n]+["].*"\n" { |
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140 | /* " stop highlighting */ |
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141 | static char filename[FILENAME_MAX]; // temporarily store current source-file name |
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142 | char *end_num; |
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143 | char *begin_string, *end_string; |
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144 | long lineno, length; |
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145 | lineno = strtol( yytext + 1, &end_num, 0 ); |
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146 | begin_string = strchr( end_num, '"' ); |
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147 | if ( begin_string ) { // file name ? |
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148 | end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter |
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149 | assert( end_string ); // closing quote ? |
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150 | length = end_string - begin_string - 1; // file-name length without quotes or sentinel |
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151 | assert( length < FILENAME_MAX ); // room for sentinel ? |
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152 | memcpy( &filename, begin_string + 1, length ); // copy file name from yytext |
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153 | filename[ length ] = '\0'; // terminate string with sentinel |
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154 | //std::cout << "file " << filename << " line " << lineno << std::endl; |
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155 | yylineno = lineno; |
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156 | yyfilename = filename; |
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157 | } // if |
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158 | } |
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159 | |
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160 | /* ignore preprocessor directives (for now) */ |
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161 | ^{h_white}*"#"[^\n]*"\n" ; |
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162 | |
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163 | /* ignore C style comments (ALSO HANDLED BY CPP) */ |
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164 | "/*" { BEGIN COMMENT; } |
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165 | <COMMENT>.|\n ; |
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166 | <COMMENT>"*/" { BEGIN 0; } |
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167 | |
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168 | /* ignore C++ style comments (ALSO HANDLED BY CPP) */ |
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169 | "//"[^\n]*"\n" ; |
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170 | |
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171 | /* ignore whitespace */ |
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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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175 | |
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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 | _At { KEYWORD_RETURN(AT); } // CFA |
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185 | _Atomic { KEYWORD_RETURN(ATOMIC); } // C11 |
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186 | __attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC |
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187 | __attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC |
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188 | auto { KEYWORD_RETURN(AUTO); } |
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189 | _Bool { KEYWORD_RETURN(BOOL); } // C99 |
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190 | break { KEYWORD_RETURN(BREAK); } |
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191 | case { KEYWORD_RETURN(CASE); } |
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192 | catch { KEYWORD_RETURN(CATCH); } // CFA |
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193 | catchResume { KEYWORD_RETURN(CATCHRESUME); } // CFA |
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194 | char { KEYWORD_RETURN(CHAR); } |
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195 | choose { KEYWORD_RETURN(CHOOSE); } // CFA |
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196 | _Complex { KEYWORD_RETURN(COMPLEX); } // C99 |
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197 | __complex { KEYWORD_RETURN(COMPLEX); } // GCC |
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198 | __complex__ { KEYWORD_RETURN(COMPLEX); } // GCC |
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199 | const { KEYWORD_RETURN(CONST); } |
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200 | __const { KEYWORD_RETURN(CONST); } // GCC |
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201 | __const__ { KEYWORD_RETURN(CONST); } // GCC |
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202 | continue { KEYWORD_RETURN(CONTINUE); } |
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203 | coroutine { KEYWORD_RETURN(COROUTINE); } // CFA |
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204 | default { KEYWORD_RETURN(DEFAULT); } |
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205 | disable { KEYWORD_RETURN(DISABLE); } // CFA |
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206 | do { KEYWORD_RETURN(DO); } |
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207 | double { KEYWORD_RETURN(DOUBLE); } |
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208 | dtype { KEYWORD_RETURN(DTYPE); } // CFA |
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209 | else { KEYWORD_RETURN(ELSE); } |
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210 | enable { KEYWORD_RETURN(ENABLE); } // CFA |
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211 | enum { KEYWORD_RETURN(ENUM); } |
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212 | __extension__ { KEYWORD_RETURN(EXTENSION); } // GCC |
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213 | extern { KEYWORD_RETURN(EXTERN); } |
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214 | fallthrough { KEYWORD_RETURN(FALLTHRU); } // CFA |
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215 | fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA |
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216 | finally { KEYWORD_RETURN(FINALLY); } // CFA |
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217 | float { KEYWORD_RETURN(FLOAT); } |
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218 | __float128 { KEYWORD_RETURN(FLOAT); } // GCC |
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219 | for { KEYWORD_RETURN(FOR); } |
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220 | forall { KEYWORD_RETURN(FORALL); } // CFA |
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221 | fortran { KEYWORD_RETURN(FORTRAN); } |
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222 | ftype { KEYWORD_RETURN(FTYPE); } // CFA |
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223 | _Generic { KEYWORD_RETURN(GENERIC); } // C11 |
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224 | goto { KEYWORD_RETURN(GOTO); } |
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225 | if { KEYWORD_RETURN(IF); } |
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226 | _Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99 |
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227 | __imag { KEYWORD_RETURN(IMAGINARY); } // GCC |
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228 | __imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC |
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229 | inline { KEYWORD_RETURN(INLINE); } // C99 |
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230 | __inline { KEYWORD_RETURN(INLINE); } // GCC |
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231 | __inline__ { KEYWORD_RETURN(INLINE); } // GCC |
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232 | int { KEYWORD_RETURN(INT); } |
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233 | __int128 { KEYWORD_RETURN(INT); } // GCC |
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234 | __label__ { KEYWORD_RETURN(LABEL); } // GCC |
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235 | long { KEYWORD_RETURN(LONG); } |
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236 | lvalue { KEYWORD_RETURN(LVALUE); } // CFA |
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237 | monitor { KEYWORD_RETURN(MONITOR); } // CFA |
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238 | mutex { KEYWORD_RETURN(MUTEX); } // CFA |
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239 | _Noreturn { KEYWORD_RETURN(NORETURN); } // C11 |
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240 | __builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC |
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241 | one_t { NUMERIC_RETURN(ONE_T); } // CFA |
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242 | otype { KEYWORD_RETURN(OTYPE); } // CFA |
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243 | register { KEYWORD_RETURN(REGISTER); } |
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244 | restrict { KEYWORD_RETURN(RESTRICT); } // C99 |
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245 | __restrict { KEYWORD_RETURN(RESTRICT); } // GCC |
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246 | __restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC |
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247 | return { KEYWORD_RETURN(RETURN); } |
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248 | short { KEYWORD_RETURN(SHORT); } |
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249 | signed { KEYWORD_RETURN(SIGNED); } |
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250 | __signed { KEYWORD_RETURN(SIGNED); } // GCC |
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251 | __signed__ { KEYWORD_RETURN(SIGNED); } // GCC |
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252 | sizeof { KEYWORD_RETURN(SIZEOF); } |
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253 | static { KEYWORD_RETURN(STATIC); } |
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254 | _Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11 |
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255 | struct { KEYWORD_RETURN(STRUCT); } |
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256 | switch { KEYWORD_RETURN(SWITCH); } |
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257 | thread { KEYWORD_RETURN(THREAD); } // C11 |
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258 | _Thread_local { KEYWORD_RETURN(THREADLOCAL); } // C11 |
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259 | throw { KEYWORD_RETURN(THROW); } // CFA |
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260 | throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA |
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261 | trait { KEYWORD_RETURN(TRAIT); } // CFA |
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262 | try { KEYWORD_RETURN(TRY); } // CFA |
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263 | ttype { KEYWORD_RETURN(TTYPE); } // CFA |
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264 | typedef { KEYWORD_RETURN(TYPEDEF); } |
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265 | typeof { KEYWORD_RETURN(TYPEOF); } // GCC |
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266 | __typeof { KEYWORD_RETURN(TYPEOF); } // GCC |
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267 | __typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC |
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268 | union { KEYWORD_RETURN(UNION); } |
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269 | unsigned { KEYWORD_RETURN(UNSIGNED); } |
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270 | __builtin_va_list { KEYWORD_RETURN(VALIST); } // GCC |
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271 | void { KEYWORD_RETURN(VOID); } |
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272 | volatile { KEYWORD_RETURN(VOLATILE); } |
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273 | __volatile { KEYWORD_RETURN(VOLATILE); } // GCC |
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274 | __volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC |
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275 | while { KEYWORD_RETURN(WHILE); } |
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276 | with { KEYWORD_RETURN(WITH); } // CFA |
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277 | zero_t { NUMERIC_RETURN(ZERO_T); } // CFA |
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278 | |
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279 | /* identifier */ |
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280 | {identifier} { IDENTIFIER_RETURN(); } |
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281 | {attr_identifier} { ATTRIBUTE_RETURN(); } |
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282 | "`" { BEGIN BKQUOTE; } |
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283 | <BKQUOTE>{identifier} { IDENTIFIER_RETURN(); } |
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284 | <BKQUOTE>"`" { BEGIN 0; } |
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285 | |
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286 | /* numeric constants */ |
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287 | "0" { NUMERIC_RETURN(ZERO); } // CFA |
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288 | "1" { NUMERIC_RETURN(ONE); } // CFA |
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289 | {decimal_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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290 | {octal_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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291 | {hex_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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292 | {real_decimal} { NUMERIC_RETURN(REALDECIMALconstant); } // must appear before floating_constant |
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293 | {real_fraction} { NUMERIC_RETURN(REALFRACTIONconstant); } // must appear before floating_constant |
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294 | {floating_constant} { NUMERIC_RETURN(FLOATINGconstant); } |
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295 | {hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); } |
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296 | |
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297 | /* character constant, allows empty value */ |
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298 | ({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new std::string( yytext, yyleng ); } |
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299 | <QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); } |
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300 | <QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); } |
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301 | /* ' stop highlighting */ |
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302 | |
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303 | /* string constant */ |
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304 | ({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new std::string( yytext, yyleng ); } |
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305 | <STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); } |
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306 | <STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); } |
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307 | /* " stop highlighting */ |
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308 | |
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309 | /* common character/string constant */ |
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310 | <QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); } |
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311 | <QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP) |
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312 | <QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character |
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313 | |
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314 | /* punctuation */ |
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315 | "@" { ASCIIOP_RETURN(); } |
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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(); } // also operator |
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323 | ":" { ASCIIOP_RETURN(); } |
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324 | ";" { ASCIIOP_RETURN(); } |
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325 | "." { ASCIIOP_RETURN(); } // also operator |
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326 | "..." { NAMEDOP_RETURN(ELLIPSIS); } |
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327 | |
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328 | /* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */ |
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329 | "<:" { RETURN_VAL('['); } |
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330 | ":>" { RETURN_VAL(']'); } |
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331 | "<%" { RETURN_VAL('{'); } |
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332 | "%>" { RETURN_VAL('}'); } |
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333 | |
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334 | /* operators */ |
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335 | "!" { ASCIIOP_RETURN(); } |
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336 | "+" { ASCIIOP_RETURN(); } |
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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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341 | "\\" { ASCIIOP_RETURN(); } // CFA, exponentiation |
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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 | |
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351 | "++" { NAMEDOP_RETURN(ICR); } |
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352 | "--" { NAMEDOP_RETURN(DECR); } |
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353 | "==" { NAMEDOP_RETURN(EQ); } |
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354 | "!=" { NAMEDOP_RETURN(NE); } |
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355 | "<<" { NAMEDOP_RETURN(LS); } |
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356 | ">>" { NAMEDOP_RETURN(RS); } |
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357 | "<=" { NAMEDOP_RETURN(LE); } |
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358 | ">=" { NAMEDOP_RETURN(GE); } |
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359 | "&&" { NAMEDOP_RETURN(ANDAND); } |
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360 | "||" { NAMEDOP_RETURN(OROR); } |
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361 | "->" { NAMEDOP_RETURN(ARROW); } |
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362 | "+=" { NAMEDOP_RETURN(PLUSassign); } |
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363 | "-=" { NAMEDOP_RETURN(MINUSassign); } |
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364 | "*=" { NAMEDOP_RETURN(MULTassign); } |
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365 | "/=" { NAMEDOP_RETURN(DIVassign); } |
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366 | "%=" { NAMEDOP_RETURN(MODassign); } |
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367 | "\\=" { NAMEDOP_RETURN(MODassign); } // CFA, exponentiation |
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368 | "&=" { NAMEDOP_RETURN(ANDassign); } |
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369 | "|=" { NAMEDOP_RETURN(ORassign); } |
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370 | "^=" { NAMEDOP_RETURN(ERassign); } |
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371 | "<<=" { NAMEDOP_RETURN(LSassign); } |
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372 | ">>=" { NAMEDOP_RETURN(RSassign); } |
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373 | |
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374 | "@=" { NAMEDOP_RETURN(ATassign); } // CFA |
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375 | |
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376 | /* CFA, operator identifier */ |
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377 | {op_unary}"?" { IDENTIFIER_RETURN(); } // unary |
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378 | "?"({op_unary_pre_post}|"()"|"[?]"|"{}") { IDENTIFIER_RETURN(); } |
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379 | "^?{}" { IDENTIFIER_RETURN(); } |
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380 | "?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary |
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381 | /* |
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382 | This rule handles ambiguous cases with operator identifiers, e.g., "int *?*?()", where the string "*?*?" can be |
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383 | lexed as "*?"/"*?" or "*"/"?*?". Since it is common practise to put a unary operator juxtaposed to an identifier, |
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384 | e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is |
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385 | a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then |
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386 | reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator |
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387 | identifier to disambiguate this common case. |
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388 | |
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389 | A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity |
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390 | occurs when the deference operator has no parameters, *?() and *?()(...), requiring arbitrary whitespace |
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391 | look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a |
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392 | parameter/argument to dereference *?(...). Hence, always interpreting the string *?() as * ?() does not preclude |
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393 | any meaningful program. |
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394 | |
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395 | The remaining cases are with the increment/decrement operators and conditional expression: |
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396 | |
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397 | i++? ...(...); |
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398 | i?++ ...(...); |
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399 | |
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400 | requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an |
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401 | incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a |
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402 | space: |
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403 | |
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404 | i++ ? i : 0; |
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405 | i? ++i : 0; |
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406 | */ |
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407 | {op_unary}"?"({op_unary_pre_post}|"()"|"[?]"|{op_binary_over}"?") { |
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408 | // 1 or 2 character unary operator ? |
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409 | int i = yytext[1] == '?' ? 1 : 2; |
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410 | yyless( i ); // put back characters up to first '?' |
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411 | if ( i > 1 ) { |
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412 | NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR ); |
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413 | } else { |
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414 | ASCIIOP_RETURN(); |
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415 | } // if |
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416 | } |
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417 | |
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418 | /* unknown characters */ |
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419 | . { printf("unknown character(s):\"%s\" on line %d\n", yytext, yylineno); } |
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420 | |
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421 | %% |
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422 | |
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423 | // Local Variables: // |
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424 | // mode: c++ // |
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425 | // tab-width: 4 // |
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426 | // compile-command: "make install" // |
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427 | // End: // |
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