[C] *.txt Files durchsuchen

parse_expression() {
 d1 = parse_dimension();
 d2 = parse_dimension();
 expect_token('\n');
 left = parse_matrix(d1, d2);
 op = parse_operator();

 // hier ggf je nach `op` noch anpassungen an `d1` und `d2` vornehmen
 right = parse_matrix(d1, d2);

 ex = expression(left, op, right);
 return ex;
}

parse_dimension() {
 expect_token('<')
 d = parse_integer();
 expect_token('>');
 return d;
}

parse_matrix(d1, d2) {
 mx = matrix(d1, d2);
 
 for (i1 = from 0 to d1) {
 for (i2 = from 0 to d2) {
 mx[i1][i2] = parse_integer();
 }
 expect_token('\n');
 }

 return mx;
}

parse_operator() {
 expect_token('<');
 op = 0;
 switch (lookahead) {
 case '+':
 case '*':
 // ...
 op = lookahead;
 next_token();
 break;
 default:
 error();
 } 
 expect_token('>');
 expect_token('\n');
 return op;
}

parse_integer() {
 // ... ;-)
}

main() {
 e = parse_expression();
 evaluate(e);
}

 <+>
 / \ 
matrix matrix