> In my test code i want to split a math sentence in terms, like the
> next string example:
> "(2+a)*d+(a*b-3)-4-q/2"
>
> My function split_in_terms, is a very bad implementation (i know) that
> should split the string into 4 terms, and if not possible, return
> NULL.
> For that i have tryed with a List, but when using nth_data it prints
> this string: "g_list_nth_data", only once. So i think that Lists are
> not yet fully implemented so i switched to Array.
> Where now i cant compile it.
> ERROR:arraylist.c:322:gee_array_list_real_get: assertion failed: (_tmp0)
>
> And i dont have any clue where the problem is.
I find that the Gee collections are the nicest to use with Vala. (See
attachment.)
http://live.gnome.org/Vala/Tutorial#head-2eb5f4c78cb61f38bd03db07f37abf55a9ec4c07
> Also i dont know when should i use pointers in Vala.
> I know from C that every object must be defined as a pointer, but the
> Vala bindings, doesnt defines them as pointer, so, why should i add an
> *
Pointers should probably be avoided whenever possible.
http://live.gnome.org/Vala/Tutorial#head-8712c308df0fc07f772bb1f8011373900d8a46ac
> If i dont add it, i cant change the value of the parameter.
> supouse a function like next:
> private static void split_in_terms(string strmath, string* term_left,
> string* term_right)
> This also gives a lot of warnings for term_left and right.
Vala supports the modifiers "out" and "ref" for passing arguments by reference.
http://live.gnome.org/Vala/Tutorial#head-64f47493a7181152df5d9db98a2f998ef6147163
--
http://homes.eff.org/~barlow/EconomyOfIdeas.html
http://www.dreamsongs.com/MobSoftware.html
http://www.gnu.org/philosophy/shouldbefree.html
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
_______________________________________________
Vala-list mailing list
[email protected]
http://mail.gnome.org/mailman/listinfo/vala-list
