<s>
Lava	B-Application
is	O
an	O
experimental	O
,	O
visual	B-Language
object-oriented	B-Language
,	O
interpreter-based	O
programming	O
language	O
with	O
an	O
associated	O
programming	B-Application
environment	I-Application
(	O
Lava	B-Application
Programming	B-Application
Environment	I-Application
or	O
LavaPE	B-Application
)	O
that	O
uses	O
structure	O
editors	O
instead	O
of	O
text	B-Application
editors	I-Application
.	O
</s>
<s>
Declarations	O
are	O
represented	O
in	O
LavaPE	B-Application
as	O
tree	O
structures	O
whose	O
subtrees	O
may	O
be	O
collapsed	O
or	O
expanded	O
.	O
</s>
<s>
The	O
properties	O
of	O
the	O
declared	O
Lava	B-Application
entities	O
can	O
be	O
edited	O
through	O
pop-up	O
dialogs	O
.	O
</s>
<s>
Although	O
executable	O
code	O
has	O
a	O
traditional	O
text	O
representation	O
in	O
LavaPE	B-Application
,	O
it	O
can	O
be	O
edited	O
only	O
as	O
complete	O
syntactic	O
units	O
,	O
rather	O
than	O
character	O
by	O
character	O
.	O
</s>
<s>
LavaPE	B-Application
provides	O
a	O
tool	O
button	O
for	O
every	O
type	O
of	O
syntactic	O
construct	O
,	O
and	O
a	O
button	O
is	O
enabled	O
only	O
if	O
it	O
is	O
syntactically	O
correct	O
to	O
insert	O
the	O
associated	O
construct	O
at	O
the	O
selected	O
place	O
.	O
</s>
<s>
Further	O
characteristic	O
properties	O
of	O
Lava	B-Application
and	O
LavaPE	B-Application
include	O
the	O
following	O
:	O
</s>
<s>
It	O
provides	O
strict	O
syntactic	O
separation	O
of	O
interface	B-Application
(	O
public	O
)	O
and	O
implementation	O
(	O
private	O
)	O
sections	O
of	O
a	O
Lava	B-Application
class	O
.	O
</s>
<s>
It	O
uses	O
recursion	O
and	O
logical	B-Language
quantifiers	I-Language
instead	O
of	O
traditional	O
loop	O
constructs	O
.	O
</s>
<s>
It	O
supports	O
refactoring	O
extensively	O
via	O
the	O
LavaPE	B-Application
structure	O
editors	O
.	O
</s>
<s>
Since	O
release	O
0.9.0	O
,	O
LavaPE	B-Application
completely	O
prevents	O
inadvertent	O
access	O
to	O
uninitialized	B-Error_Name
variables	I-Error_Name
and	O
null	O
objects	O
already	O
at	O
programming	O
time	O
by	O
complete	O
static	O
initialization	O
checks	O
.	O
</s>
<s>
Lava	B-Application
is	O
open	B-Application
source	I-Application
software	I-Application
using	O
the	O
GPL	B-License
license	I-License
(	O
see	O
also	O
and	O
at	O
)	O
.	O
</s>
<s>
It	O
currently	O
runs	O
on	O
Microsoft	B-Application
Windows	I-Application
,	O
Linux	B-Application
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
platforms	O
.	O
</s>
