<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
SYNTAX	B-Application
is	O
a	O
system	O
used	O
to	O
generate	O
lexical	B-Application
and	O
syntactic	O
analyzers	O
(	O
parsers	B-Language
)	O
(	O
both	O
deterministic	O
and	O
non-deterministic	O
)	O
for	O
all	O
kinds	O
of	O
context-free	O
grammars	O
(	O
CFGs	O
)	O
as	O
well	O
as	O
some	O
classes	O
of	O
contextual	O
grammars	O
.	O
</s>
<s>
It	O
has	O
been	O
developed	O
at	O
INRIA	O
in	O
France	O
for	O
several	O
decades	O
,	O
mostly	O
by	O
Pierre	O
Boullier	O
,	O
but	O
has	O
become	O
free	B-Application
software	I-Application
since	O
2007	O
only	O
.	O
</s>
<s>
SYNTAX	B-Application
is	O
distributed	O
under	O
the	O
CeCILL	B-License
license	I-License
.	O
</s>
<s>
SYNTAX	B-Application
handles	O
most	O
classes	O
of	O
deterministic	O
(	O
unambiguous	O
)	O
grammars	O
(	O
LR	B-Application
,	O
LALR	B-Application
,	O
RLR	O
as	O
well	O
as	O
general	O
context-free	O
grammars	O
.	O
</s>
<s>
The	O
deterministic	O
version	O
has	O
been	O
used	O
in	O
operational	O
contexts	O
(	O
e.g.	O
,	O
Ada	B-Language
)	O
,	O
and	O
is	O
currently	O
used	O
both	O
in	O
the	O
domain	O
of	O
compilation	B-Language
.	O
</s>
<s>
The	O
non-deterministic	O
features	O
include	O
an	O
Earley	O
parser	B-Language
generator	O
used	O
for	O
natural	B-Language
language	I-Language
processing	I-Language
.	O
</s>
<s>
Parsers	B-Language
generated	O
by	O
SYNTAX	B-Application
include	O
powerful	O
error	O
recovery	O
mechanisms	O
,	O
and	O
allow	O
the	O
execution	O
of	O
semantic	O
actions	O
and	O
attribute	O
evaluation	O
on	O
the	O
abstract	O
tree	O
or	O
on	O
the	O
shared	O
parse	O
forest	O
.	O
</s>
<s>
The	O
current	O
version	O
of	O
SYNTAX	B-Application
(	O
version	O
6.0	O
beta	O
)	O
includes	O
also	O
parser	B-Language
generators	O
for	O
other	O
formalisms	O
,	O
used	O
for	O
natural	B-Language
language	I-Language
processing	I-Language
as	O
well	O
as	O
bio-informatics	O
.	O
</s>
<s>
These	O
formalisms	O
are	O
context-sensitive	O
formalisms	O
(	O
TAG	O
,	O
RCG	O
or	O
formalisms	O
that	O
rely	O
on	O
context-free	O
grammars	O
and	O
are	O
extended	O
thanks	O
to	O
attribute	O
evaluation	O
,	O
in	O
particular	O
for	O
natural	B-Language
language	I-Language
processing	I-Language
(	O
LFG	O
)	O
.	O
</s>
<s>
A	O
nice	O
feature	O
of	O
SYNTAX	B-Application
(	O
compared	O
to	O
Lex/Yacc	O
)	O
is	O
its	O
built-in	O
algorithm	O
for	O
automatically	O
recovering	O
from	O
lexical	B-Application
and	O
syntactic	O
errors	O
,	O
by	O
deleting	O
extra	O
characters	O
or	O
tokens	O
,	O
inserting	O
missing	O
characters	O
or	O
tokens	O
,	O
permuting	O
characters	O
or	O
tokens	O
,	O
etc	O
.	O
</s>
<s>
This	O
algorithm	O
has	O
a	O
default	O
behaviour	O
that	O
can	O
be	O
modified	O
by	O
providing	O
a	O
custom	O
set	O
of	O
recovery	O
rules	O
adapted	O
to	O
the	O
language	O
for	O
which	O
the	O
lexer	B-Application
and	O
parser	B-Language
are	O
built	O
.	O
</s>
