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133 linhas
3.9 KiB
133 linhas
3.9 KiB
%{
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/* compile: leg -o calc.c calc.leg
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* cc -o calc calc.c
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*
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* run: ( echo a=2*3; echo b=3+4; echo c=a*b ) | ./calc
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*/
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#include "object.c"
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// this is the global scope
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oop globals;
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oop apply(oop function, oop parameters)
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{
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return get(function, Function, primitive)(parameters);
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}
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#define YYSTYPE oop
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YYSTYPE yylval;
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%}
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start = - e:exp { yylval = e }
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exp = l:IDENT EQUAL p:exp { $$ = map_set(globals, l, p) }
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| l:postfix DOT i:IDENT EQUAL p:exp { $$ = map_set(l, i, p) }
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| l:postfix LBRAC i:exp RBRAC EQUAL p:exp { $$ = map_set(l, i, p) }
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| s:sum { $$ = s }
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sum = l:prod
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( PLUS+ r:prod { get(l, Integer, value) += get(r, Integer, value) }
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| MINUS r:prod { get(l, Integer, value) -= get(r, Integer, value) }
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)* { $$ = l }
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prod = l:prefix
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( MULTI r:prefix { get(l, Integer, value) *= get(r, Integer, value) }
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| DIVIDE r:prefix { get(l, Integer, value) /= get(r, Integer, value) }
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| MODULO r:prefix { get(l, Integer, value) %= get(r, Integer, value) }
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)* { $$ = l }
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prefix = MINUS n:prefix { set(n, Integer, value, -get(n, Integer, value)); $$ = n }
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| PLUS n:prefix { $$ = n }
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| n:postfix { $$ = n }
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postfix = i:value ( DOT s:IDENT p:parameterList { map_set(p, intern("this"), i); i = apply(map_get(i, s), p) }
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| DOT s:IDENT !EQUAL { i = map_get(i, s) }
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| LBRAC p:exp RBRAC !EQUAL { i = map_get(i, p) }
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| p:parameterList { i = apply(i, p) }
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) * { $$ = i }
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parameterList = LPAREN m:makeMap
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( e:exp { map_append(m, e) }
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( COMMA e:exp { map_append(m, e) }
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) *
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) ?
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RPAREN { $$ = m }
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value = n:NUMBER { $$ = n }
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| s:string { $$ = s }
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| s:symbol { $$ = s }
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| m:map { $$ = m }
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| NULL { $$ = null }
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| i:IDENT { $$ = map_get(globals, i) }
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| LPAREN i:exp RPAREN { $$ = i }
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string = SQUOTE < (!SQUOTE .)* > SQUOTE { $$ = makeString(yytext) }
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| DQUOTE < (!DQUOTE .)* > DQUOTE { $$ = makeString(yytext) }
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symbol = HASH ( i:IDENT { $$ = i }
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| i:string { $$ = intern(get(i, String, value)) }
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)
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map = LCB m:makeMap
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( k:IDENT COLON v:exp { map_set(m, k, v) }
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( COMMA k:IDENT COLON v:exp { map_set(m, k, v) }
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) *
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) ?
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RCB { $$ = m }
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makeMap = { $$ = makeMap() }
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- = [ \t\n\r]*
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| "//" ( ![\n\r] . )*
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IDENT = < [a-zA-Z][a-zA-Z0-9_]* > - { $$ = intern(yytext) }
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NUMBER = < [0-9]+ > - { $$ = makeInteger(atoi(yytext)) }
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HASH = '#' -
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PLUS = '+' -
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MINUS = '-' -
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MULTI = '*' -
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DIVIDE = '/' -
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MODULO = '%' -
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EQUAL = '=' -
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NULL = 'null' -
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COLON = ':' -
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COMMA = ',' -
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DOT = '.' -
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LCB = '{' -
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RCB = '}' -
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LBRAC = '[' -
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RBRAC = ']' -
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LPAREN = '(' -
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RPAREN = ')' -
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DQUOTE = '"' -
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SQUOTE = "'" -
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%%
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;
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oop prim_exit(oop params)
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{
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printf("bye bye with params ");
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println(params);
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exit(0);
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}
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int main(int argc, char **argv)
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{
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symbol_table = makeMap();
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globals = makeMap();
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map_set(globals, intern("exit"), makeFunction(prim_exit));
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while (yyparse()) {
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println(yylval);
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}
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return 0;
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(void)yyAccept;
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}
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