<s>
The	O
Spirit	B-General_Concept
Parser	I-General_Concept
Framework	I-General_Concept
is	O
an	O
object	B-Language
oriented	I-Language
recursive	B-Application
descent	I-Application
parser	I-Application
generator	O
framework	O
implemented	O
using	O
template	O
metaprogramming	B-Application
techniques	O
.	O
</s>
<s>
Expression	B-Application
templates	I-Application
allow	O
users	O
to	O
approximate	O
the	O
syntax	O
of	O
extended	O
Backus	O
–	O
Naur	O
form	O
(	O
EBNF	O
)	O
completely	O
in	O
C++	B-Language
.	O
</s>
<s>
Spirit	O
can	O
be	O
used	O
for	O
both	O
lexing	B-Application
and	O
parsing	O
,	O
together	O
or	O
separately	O
.	O
</s>
<s>
Because	O
of	O
limitations	O
of	O
the	O
C++	B-Language
language	I-Language
,	O
the	O
syntax	O
of	O
Spirit	O
has	O
been	O
designed	O
around	O
the	O
operator	O
precedences	O
of	O
C++	B-Language
,	O
while	O
bearing	O
resemblance	O
to	O
both	O
EBNF	O
and	O
regular	B-Language
expressions	I-Language
.	O
</s>
<s>
This	O
represents	O
the	O
Kleene	O
star	O
;	O
C++	B-Language
lacks	O
an	O
unary	O
postfix	O
operator	O
*	O
.	O
</s>
