Re: [Vala] Starting with Vala, problems with strings
Hi again.
I am still having troubles with things that i should easily do in C.
Maybe because i have never programmed in C#, or mono or anything like
it.
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.
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
*
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.
Please note too the casting in: new Array(false, true,
(uint)sizeof(string));
Seems like the new array requires an ulong instead of uint which is
returned by sizeof. I dont know if this is the correct behavior or
not, but it seems strange.
private static Array* split_in_terms(string strmath)
{
int x = 0;
int parentesis=0;
Array list = new Array(false, true, (uint)sizeof(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.append_val( term.str );
print("%s\n",term.str);
term = new StringBuilder("");
p = x+1;
if ( str.len() >= p )
list.append_val( "+" );
}
}
else
{
term.append_unichar(c);
}
x++;
}
list.append_val( term.str );
if (parentesis != 0)
{
stdout.printf("SintaxERROR: Los parentesis no cierran
adecuadamente: %s\n", str);
return null;
}
return &list;
}
public void calculate ()
{
double mean, max, min;
string str = "holaaa+world";
print ("1");
Array* list = split_in_terms( str );
print ("2");
for (int i = 0; i < list->length; i++)
stdout.printf ("term%d = %s\n", i, list->index(i));
/*for (int i = 0; i < list->length(); i++)
stdout.printf ("term%d = %s\n", i, list->nth_data
(i)*/);*/
print ("3");
.
Cheers.
Diego
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Re: [Vala] [ANNOUNCE] Vala 0.7.1 - Compiler for the GObject type system
2009/4/20 Michael 'Mickey' Lauer : > It was discussed on this very list few days ago. > > http://mail.gnome.org/archives/vala-list/2009-April/msg00097.html /me is guilty of not reading all threads Thanks! -mt ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
Re: [Vala] [ANNOUNCE] Vala 0.7.1 - Compiler for the GObject type system
On Monday 20 April 2009 18:54:51 Michael Terry wrote: > 2009/4/20 Jürg Billeter : > > * Introduce new syntax to connect/disconnect signal handlers. > > Can you expound on that? I didn't see anything new in the wiki tutorial. It was discussed on this very list few days ago. http://mail.gnome.org/archives/vala-list/2009-April/msg00097.html :M: ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
Re: [Vala] [ANNOUNCE] Vala 0.7.1 - Compiler for the GObject type system
2009/4/20 Jan Niklas Hasse : > How can I let valac 0.7 create a .vapi file (like it is described here: You're trying to create a library used by other Vala code? You probably want the --library argument. -mt ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
Re: [Vala] [ANNOUNCE] Vala 0.7.1 - Compiler for the GObject type system
2009/4/20 Jürg Billeter : > * Introduce new syntax to connect/disconnect signal handlers. Can you expound on that? I didn't see anything new in the wiki tutorial. -mt ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
Re: [Vala] [ANNOUNCE] Vala 0.7.1 - Compiler for the GObject type system
I've got a question, sorry if it has already been answered or the answer is obvious: How can I let valac 0.7 create a .vapi file (like it is described here: http://live.gnome.org/Vala/Tutorial#head-4b087370837491f65c097e895868d22677bde803 ) ? ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
[Vala] [ANNOUNCE] Vala 0.7.1 - Compiler for the GObject type system
We are pleased to announce version 0.7.1 of Vala, a compiler for the GObject type system. Vala 0.7.1 is now available for download at: http://download.gnome.org/sources/vala/0.7/ Changes since 0.7.0 * Introduce new syntax to connect/disconnect signal handlers. * Add experimental support for fixed-length arrays. * Update Genie parser (Jamie McCracken). * Updates to the GLib, Cairo, GTK+, GStreamer, and POSIX bindings. * Many bug fixes. Vala is a new programming language that aims to bring modern programming language features to GNOME developers without imposing any additional runtime requirements and without using a different ABI compared to applications and libraries written in C. valac, the Vala compiler, is a self-hosting compiler that translates Vala source code into C source and header files. It uses the GObject type system to create classes and interfaces declared in the Vala source code. The syntax of Vala is similar to C#, modified to better fit the GObject type system. Vala supports modern language features as the following: * Interfaces * Properties * Signals * Foreach * Lambda expressions * Type inference for local variables * Generics * Non-null types * Assisted memory management * Exception handling Vala is designed to allow access to existing C libraries, especially GObject-based libraries, without the need for runtime bindings. All that is needed to use a library with Vala is an API file, containing the class and method declarations in Vala syntax. Vala currently comes with bindings for GLib and GTK+. It's planned to provide generated bindings for the full GNOME Platform at a later stage. Using classes and methods written in Vala from an application written in C is not difficult. The Vala library only has to install the generated header files and C applications may then access the GObject-based API of the Vala library as usual. It should also be easily possible to write a bindings generator for access to Vala libraries from applications written in e.g. C# as the Vala parser is written as a library, so that all compile-time information is available when generating a binding. More information about Vala is available at http://live.gnome.org/Vala The Vala Team Jürg Billeter and Raffaele Sandrini ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
Re: [Vala] Starting with Vala, problems with strings
On Sun, 2009-04-19 at 23:33 +0200, Frederik wrote: > Diego Jacobi wrote: > > Why isnt string = GString ? > > Also i am courius why is it called StringBuilder? It sound like "not a > > GString". > > In order to resemble C# and Java which both have [s|S]tring and > StringBuilder. > > string = char *(immutable) > StringBuilder = GString(mutable) > ...Although there are a few special functions on string that modify the string in-place. Also GString is not intended for text manipulation. It doesn't know more about utf8 other than append_unichar. > > Regards, > > Frederik > ___ > Vala-list mailing list > Vala-list@gnome.org > http://mail.gnome.org/mailman/listinfo/vala-list ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
