author | Markus Bröker <mbroeker@largo.dyndns.tv> |
Sat, 13 Dec 2008 17:57:57 +0100 | |
changeset 5 | d752cbe8208e |
child 9 | c3fecc82ade6 |
permissions | -rw-r--r-- |
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/* |
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* $Id$ |
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* $URL$ |
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*/ |
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%{ |
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#include <stdio.h> |
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#include <ctype.h> |
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int regs[26]; |
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int base; |
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int yyerror(); |
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int yylex(); |
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%} |
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|
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%start list |
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%token DIGIT LETTER |
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%left MINUS PLUS MUL DIV |
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%left UMINUS |
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%% |
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|
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list : /* empty */ |
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| list stat '\n' |
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| list error '\n' { yyerrok; }; |
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stat : |
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expr { (void) printf( "RESULT: %d\n", $1 ); } |
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| LETTER '=' expr { regs[$1] = $3; } |
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; |
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|
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expr : '(' expr ')' |
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{ |
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$$ = $2; |
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} |
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| expr PLUS expr |
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{ |
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$$ = $1 + $3; |
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} |
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| expr MINUS expr |
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{ |
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$$ = $1 - $3; |
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} |
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| expr MUL expr |
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{ |
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$$ = $1 * $3; |
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} |
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| expr DIV expr |
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{ |
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$$ = $1 / $3; |
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} |
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| MINUS expr %prec UMINUS |
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{ |
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$$ = -$2; |
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} |
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| LETTER |
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{ |
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$$ = regs[$1]; |
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} |
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| number |
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; |
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|
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number : DIGIT |
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{ |
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$$ = $1; base = ($1==0) ? 8 : 10; |
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} |
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| number DIGIT |
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{ |
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$$ = base * $1 + $2; |
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} |
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; |
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%% |
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int yyerror() |
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{ |
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printf("ERROR\n"); |
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return 0; |
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} |
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int yywrap() |
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{ |
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return 1; |
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} |