mirror of
https://github.com/RetroShare/RetroShare.git
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3be22536df
git-svn-id: http://svn.code.sf.net/p/retroshare/code/branches/v0.5-gxs-b1@5953 b45a01b8-16f6-495d-af2f-9b41ad6348cc
47 lines
800 B
Plaintext
47 lines
800 B
Plaintext
%{
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#include <stdio.h>
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int vars[26];
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%}
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Stmt = - e:Expr EOL { printf("%d\n", e); }
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| ( !EOL . )* EOL { printf("error\n"); }
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Expr = i:ID ASSIGN s:Sum { $$= vars[i]= s; }
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| s:Sum { $$= s; }
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Sum = l:Product
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( PLUS r:Product { l += r; }
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| MINUS r:Product { l -= r; }
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)* { $$= l; }
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Product = l:Value
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( TIMES r:Value { l *= r; }
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| DIVIDE r:Value { l /= r; }
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)* { $$= l; }
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Value = i:NUMBER { $$= atoi(yytext); }
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| i:ID !ASSIGN { $$= vars[i]; }
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| OPEN i:Expr CLOSE { $$= i; }
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NUMBER = < [0-9]+ > - { $$= atoi(yytext); }
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ID = < [a-z] > - { $$= yytext[0] - 'a'; }
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ASSIGN = '=' -
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PLUS = '+' -
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MINUS = '-' -
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TIMES = '*' -
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DIVIDE = '/' -
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OPEN = '(' -
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CLOSE = ')' -
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- = [ \t]*
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EOL = '\n' | '\r\n' | '\r' | ';'
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%%
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int main()
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{
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while (yyparse());
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return 0;
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}
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