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cpp-libs
Actor Framework
Commits
4c894a79
Commit
4c894a79
authored
May 14, 2018
by
Dominik Charousset
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Add an FSM-based one-pass atom parser
parent
d5e439c5
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2
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2 changed files
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168 additions
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0 deletions
+168
-0
libcaf_core/caf/detail/parser/read_atom.hpp
libcaf_core/caf/detail/parser/read_atom.hpp
+79
-0
libcaf_core/test/read_atom.cpp
libcaf_core/test/read_atom.cpp
+89
-0
No files found.
libcaf_core/caf/detail/parser/read_atom.hpp
0 → 100644
View file @
4c894a79
/******************************************************************************
* ____ _ _____ *
* / ___| / \ | ___| C++ *
* | | / _ \ | |_ Actor *
* | |___ / ___ \| _| Framework *
* \____/_/ \_|_| *
* *
* Copyright 2011-2018 Dominik Charousset *
* *
* Distributed under the terms and conditions of the BSD 3-Clause License or *
* (at your option) under the terms and conditions of the Boost Software *
* License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE. *
* *
* If you did not receive a copy of the license files, see *
* http://opensource.org/licenses/BSD-3-Clause and *
* http://www.boost.org/LICENSE_1_0.txt. *
******************************************************************************/
#pragma once
#include <cstdint>
#include <ctype.h>
#include <string>
#include "caf/atom.hpp"
#include "caf/detail/scope_guard.hpp"
#include "caf/detail/parser/ec.hpp"
#include "caf/detail/parser/fsm.hpp"
#include "caf/detail/parser/is_char.hpp"
#include "caf/detail/parser/state.hpp"
namespace
caf
{
namespace
detail
{
namespace
parser
{
/// Reads a number, i.e., on success produces either an `int64_t` or a
/// `double`.
template
<
class
Iterator
,
class
Sentinel
,
class
Consumer
>
void
read_atom
(
state
<
Iterator
,
Sentinel
>&
ps
,
Consumer
&
consumer
)
{
size_t
pos
=
0
;
char
buf
[
11
];
memset
(
buf
,
0
,
sizeof
(
buf
));
auto
is_legal
=
[](
char
c
)
{
return
isalnum
(
c
)
||
c
==
'_'
||
c
==
' '
;
};
auto
append
=
[
&
](
char
c
)
{
if
(
pos
==
sizeof
(
buf
)
-
1
)
return
false
;
buf
[
pos
++
]
=
c
;
return
true
;
};
auto
g
=
caf
::
detail
::
make_scope_guard
([
&
]
{
if
(
ps
.
code
<=
ec
::
trailing_character
)
consumer
.
value
(
atom
(
buf
));
});
start
();
state
(
init
)
{
input
(
is_char
<
' '
>
,
init
)
input
(
is_char
<
'\t'
>
,
init
)
input
(
is_char
<
'\''
>
,
read_chars
)
}
state
(
read_chars
)
{
input
(
is_char
<
'\''
>
,
done
)
checked_action
(
is_legal
,
read_chars
,
append
(
ch
),
ec
::
too_many_characters
)
invalid_input
(
is_char
<
'\n'
>
,
ec
::
unexpected_newline
)
}
term_state
(
done
)
{
input
(
is_char
<
' '
>
,
done
)
input
(
is_char
<
'\t'
>
,
done
)
}
fin
();
}
}
// namespace parser
}
// namespace detail
}
// namespace caf
libcaf_core/test/read_atom.cpp
0 → 100644
View file @
4c894a79
/******************************************************************************
* ____ _ _____ *
* / ___| / \ | ___| C++ *
* | | / _ \ | |_ Actor *
* | |___ / ___ \| _| Framework *
* \____/_/ \_|_| *
* *
* Copyright 2011-2018 Dominik Charousset *
* *
* Distributed under the terms and conditions of the BSD 3-Clause License or *
* (at your option) under the terms and conditions of the Boost Software *
* License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE. *
* *
* If you did not receive a copy of the license files, see *
* http://opensource.org/licenses/BSD-3-Clause and *
* http://www.boost.org/LICENSE_1_0.txt. *
******************************************************************************/
#define CAF_SUITE read_atom
#include <string>
#include "caf/test/unit_test.hpp"
#include "caf/variant.hpp"
#include "caf/detail/parser/read_atom.hpp"
using
namespace
caf
;
using
detail
::
parser
::
ec
;
namespace
{
struct
atom_parser_consumer
{
atom_value
x
;
inline
void
value
(
atom_value
y
)
{
x
=
y
;
}
};
using
res_t
=
variant
<
ec
,
atom_value
>
;
struct
atom_parser
{
res_t
operator
()(
std
::
string
str
)
{
detail
::
parser
::
state
<
std
::
string
::
iterator
>
res
;
atom_parser_consumer
f
;
res
.
i
=
str
.
begin
();
res
.
e
=
str
.
end
();
detail
::
parser
::
read_atom
(
res
,
f
);
if
(
res
.
code
==
ec
::
success
)
return
f
.
x
;
return
res
.
code
;
}
};
struct
fixture
{
atom_parser
p
;
};
}
// namespace <anonymous>
CAF_TEST_FIXTURE_SCOPE
(
read_atom_tests
,
fixture
)
CAF_TEST
(
empty
atom
)
{
CAF_CHECK_EQUAL
(
p
(
"''"
),
atom
(
""
));
CAF_CHECK_EQUAL
(
p
(
" ''"
),
atom
(
""
));
CAF_CHECK_EQUAL
(
p
(
" ''"
),
atom
(
""
));
CAF_CHECK_EQUAL
(
p
(
"'' "
),
atom
(
""
));
CAF_CHECK_EQUAL
(
p
(
"'' "
),
atom
(
""
));
CAF_CHECK_EQUAL
(
p
(
" '' "
),
atom
(
""
));
CAF_CHECK_EQUAL
(
p
(
"
\t
''
\t\t\t
"
),
atom
(
""
));
}
CAF_TEST
(
non
-
empty
atom
)
{
CAF_CHECK_EQUAL
(
p
(
"'abc'"
),
atom
(
"abc"
));
CAF_CHECK_EQUAL
(
p
(
"'a b c'"
),
atom
(
"a b c"
));
CAF_CHECK_EQUAL
(
p
(
" 'abcdef' "
),
atom
(
"abcdef"
));
}
CAF_TEST
(
invalid
atoms
)
{
CAF_CHECK_EQUAL
(
p
(
"'abc"
),
ec
::
unexpected_eof
);
CAF_CHECK_EQUAL
(
p
(
"'ab
\n
c'"
),
ec
::
unexpected_newline
);
CAF_CHECK_EQUAL
(
p
(
"abc"
),
ec
::
unexpected_character
);
CAF_CHECK_EQUAL
(
p
(
"'abc' def"
),
ec
::
trailing_character
);
CAF_CHECK_EQUAL
(
p
(
"'12345678901'"
),
ec
::
too_many_characters
);
}
CAF_TEST_FIXTURE_SCOPE_END
()
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