using GLib;
using Gee;

// valac --pkg gee-1.0 -o blah blah.vala
public class Foo: Object {
	public static int main() {
		Gee.List<string>? terms = split_in_terms ("(2+a)*d+(a*b-3)-4-q/2");

		if(null == terms) {
			stdout.printf("Error parsing string!\n");
			return 1;
		}

		foreach (string term in terms) {
			stdout.printf("Got term \"%s\"\n", term);
		}

		return 0;
	}

	private static Gee.List<string>? split_in_terms(string strmath)
	{
		int x = 0;
		int parentesis=0;
		ArrayList<string> list = new ArrayList<string>();
		string str = strmath;
		StringBuilder term = new StringBuilder("");
		int p = 0;

		stdout.printf("str = %s\n", str);

		for(weak string s = str; s.get_char()!=0 ; s = s.next_char()) {
			unichar c = s.get_char();
			if ( c == '(') {
				parentesis++;
				term.append_unichar(c);
			} else if ( c == ')') {
				parentesis--;
				term.append_unichar(c);
			}
			else if ( c == '+') {
				if ( parentesis == 0) {
					list.add( term.str );

					print("%s\n",term.str);
					term = new StringBuilder("");
					p = x+1;
					if ( str.len() >= p )
						list.add( "+" );
				}
			} else {
				term.append_unichar(c);
			}
			x++;
		}
		list.add( term.str );

		if (parentesis != 0) {
			 stdout.printf("SintaxERROR: Los parentesis no cierran adecuadamente: %s\n", str);
			 return null;
		}
		return list;
	}
}// Foo