<s>
Pugs	B-Language
is	O
a	O
compiler	B-Language
and	O
interpreter	B-Application
for	O
the	O
Raku	B-Application
programming	O
language	O
,	O
started	O
on	O
February	O
1	O
,	O
2005	O
,	O
by	O
Audrey	O
Tang	O
.	O
</s>
<s>
(	O
At	O
the	O
time	O
,	O
Raku	B-Application
was	O
known	O
as	O
Perl	B-Application
6	I-Application
.	O
)	O
</s>
<s>
Pugs	B-Language
development	O
is	O
now	O
placed	O
on	O
hiatus	O
,	O
with	O
most	O
Raku	B-Application
implementation	O
efforts	O
now	O
taking	O
place	O
on	O
Rakudo	B-Language
.	O
</s>
<s>
The	O
Pugs	B-Language
project	O
aimed	O
to	O
bootstrap	B-Application
Perl	B-Application
6	I-Application
by	O
implementing	O
the	O
full	O
Perl	B-Application
6	I-Application
specification	O
,	O
as	O
detailed	O
in	O
the	O
.	O
</s>
<s>
It	O
is	O
written	O
in	O
Haskell	B-Language
,	O
specifically	O
targeting	O
the	B-Application
Glasgow	I-Application
Haskell	I-Application
Compiler	I-Application
.	O
</s>
<s>
Pugs	B-Language
includes	O
two	O
main	O
executables	O
:	O
</s>
<s>
Pugs	B-Language
is	O
the	O
interpreter	B-Application
with	O
an	O
interactive	O
shell	O
.	O
</s>
<s>
Pugscc	O
can	O
compile	B-Language
Perl	B-Application
6	I-Application
programs	O
into	O
Haskell	B-Language
code	O
,	O
Perl	O
5	O
,	O
JavaScript	B-Language
,	O
or	O
Parrot	B-Language
virtual	I-Language
machine	I-Language
's	O
PIR	B-Language
assembly	O
.	O
</s>
<s>
Pugs	B-Language
is	O
free	B-Application
software	I-Application
,	O
distributable	O
under	O
the	O
terms	O
of	O
either	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
or	O
the	O
Artistic	B-License
License	I-License
.	O
</s>
<s>
The	O
major/minor	O
version	O
numbers	O
of	O
Pugs	B-Language
converges	O
to	O
2π	O
(	O
being	O
reminiscent	O
of	O
TeX	B-Application
and	O
METAFONT	B-Operating_System
,	O
which	O
use	O
a	O
similar	O
scheme	O
)	O
;	O
each	O
significant	O
digit	O
in	O
the	O
minor	O
version	O
represents	O
a	O
successfully	O
completed	O
milestone	O
.	O
</s>
<s>
6.283185	O
:	O
Port	O
Pugs	B-Language
to	O
Perl	B-Application
6	I-Application
,	O
if	O
needed	O
.	O
</s>
<s>
As	O
of	O
version	O
6.2.6	O
,	O
Pugs	B-Language
also	O
has	O
the	O
ability	O
to	O
embed	O
Perl	O
5	O
and	O
use	O
CPAN	B-Language
modules	O
installed	O
on	O
the	O
system	O
.	O
</s>
<s>
The	O
example	O
below	O
demonstrates	O
the	O
use	O
of	O
the	O
popular	O
Perl	B-Language
DBI	I-Language
module	O
to	O
manage	O
a	O
database	O
:	O
</s>
<s>
Several	O
factors	O
have	O
been	O
suggested	O
as	O
reasons	O
for	O
Pugs	B-Language
's	O
progress	O
:	O
</s>
<s>
Haskell	B-Language
's	O
static	O
typing	O
can	O
make	O
it	O
easier	O
for	O
program	O
bugs	O
to	O
be	O
detected	O
at	O
compile	B-Language
time	O
.	O
</s>
<s>
Haskell	B-Language
code	O
is	O
also	O
often	O
thought	O
to	O
be	O
concise	O
.	O
</s>
<s>
The	O
Parsec	O
library	O
,	O
a	O
monadic	O
combinatorial	O
parser	O
written	O
entirely	O
in	O
Haskell	B-Language
,	O
simplifies	O
parsing	O
.	O
</s>
<s>
Because	O
Haskell	B-Language
is	O
a	O
purely	O
functional	O
language	O
,	O
making	O
the	O
functional	O
code	O
interact	O
with	O
the	O
real	O
world	O
(	O
inputs/outputs	O
and	O
time-driven	O
environment	O
)	O
requires	O
thought	O
.	O
</s>
<s>
To	O
achieve	O
this	O
,	O
Pugs	B-Language
makes	O
extensive	O
use	O
of	O
monads	O
.	O
</s>
<s>
Pugs	B-Language
's	O
use	O
of	O
test-driven	O
methodology	O
(	O
a	O
tenet	O
of	O
Extreme	O
Programming	O
)	O
.	O
</s>
<s>
Tang	O
's	O
liberal	O
granting	O
of	O
the	O
commit	B-General_Concept
bit	I-General_Concept
.	O
</s>
<s>
Pugs	B-Language
development	O
is	O
currently	O
based	O
around	O
a	O
Subversion	B-Application
repository	O
,	O
and	O
access	O
is	O
freely	O
given	O
-	O
especially	O
to	O
people	O
wishing	O
to	O
write	O
tests	O
.	O
</s>
<s>
Other	O
Perl	B-Application
6	I-Application
implementations	O
rely	O
on	O
many	O
tests	O
developed	O
for	O
Pugs	B-Language
as	O
an	O
executable	O
specification	O
for	O
Perl	B-Application
6	I-Application
.	O
</s>
<s>
Despite	O
these	O
factors	O
,	O
progress	O
on	O
the	O
Haskell	B-Language
implementation	O
stalled	O
in	O
late	O
2006	O
,	O
as	O
personal	O
issues	O
kept	O
Audrey	O
from	O
devoting	O
as	O
much	O
time	O
to	O
the	O
project	O
as	O
she	O
had	O
in	O
2005	O
.	O
</s>
<s>
Many	O
Pugs	B-Language
contributors	O
have	O
since	O
moved	O
on	O
to	O
implement	O
Perl6-inspired	O
systems	O
as	O
CPAN	B-Language
modules	O
on	O
Perl	O
5	O
,	O
such	O
as	O
the	O
Moose	B-Language
project	O
.	O
</s>
