mirror of https://github.com/vitalif/lime
32 lines
989 B
Plaintext
32 lines
989 B
Plaintext
%class calc
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%start stmt
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%token '+' "plus sign (+)"
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%token '/' "division (/)"
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%left '+' '-'
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%left '*' '/' '%'
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%right '^'
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%right T_INC
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stmt = exp { echo " -> "; echo $1[0] . ' = ' . $1[1]; echo "\n"; }
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| var/v '=' exp/e {
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echo "$v = $e\n";
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set_variable($v, $e);
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}
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.
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exp = num { $$ = array($1, $1); }
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| var { $$ = array($1, get_variable($1)); }
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| exp '+' exp { $$ = array('(' . $1[0] . ' + ' . $3[0] . ')', $1[1] + $3[1]); }
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| exp '-' exp { $$ = array('(' . $1[0] . ' - ' . $3[0] . ')', $1[1] - $3[1]); }
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| exp '*' exp { $$ = array('(' . $1[0] . ' * ' . $3[0] . ')', $1[1] * $3[1]); }
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| exp '/' exp { $$ = array('(' . $1[0] . ' / ' . $3[0] . ')', $1[1] / $3[1]); }
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| exp '^' exp { $$ = array('(' . $1[0] . ' ^ ' . $3[0] . ')', pow($1[1], $3[1])); }
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| exp '%' exp { $$ = array('(' . $1[0] . ' % ' . $3[0] . ')', $1[1] % $3[1]); }
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| '+' exp %prec T_INC { $$ = array('(+ ' . $2[0] . ')', +($2[1])); }
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| '-' exp %prec T_INC { $$ = array('(- ' . $2[0] . ')', -($2[1])); }
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| '(' exp/$ ')'
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.
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