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Libraries
json
Commits
2c720b26
Commit
2c720b26
authored
Feb 05, 2016
by
Niels
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added a constructor from an input stream
parent
104c4b52
Changes
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6 changed files
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176 additions
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+176
-0
doc/examples/basic_json__istream.cpp
doc/examples/basic_json__istream.cpp
+55
-0
doc/examples/basic_json__istream.link
doc/examples/basic_json__istream.link
+1
-0
doc/examples/basic_json__istream.output
doc/examples/basic_json__istream.output
+34
-0
src/json.hpp
src/json.hpp
+25
-0
src/json.hpp.re2c
src/json.hpp.re2c
+25
-0
test/unit.cpp
test/unit.cpp
+36
-0
No files found.
doc/examples/basic_json__istream.cpp
0 → 100644
View file @
2c720b26
#include <json.hpp>
using
json
=
nlohmann
::
json
;
int
main
()
{
// a JSON text
auto
text
=
R"(
{
"Image": {
"Width": 800,
"Height": 600,
"Title": "View from 15th Floor",
"Thumbnail": {
"Url": "http://www.example.com/image/481989943",
"Height": 125,
"Width": 100
},
"Animated" : false,
"IDs": [116, 943, 234, 38793]
}
}
)"
;
// fill a stream with JSON text
std
::
stringstream
ss
;
ss
<<
text
;
// create JSON from stream
json
j_complete
(
ss
);
std
::
cout
<<
std
::
setw
(
4
)
<<
j_complete
<<
"
\n\n
"
;
// define parser callback
json
::
parser_callback_t
cb
=
[](
int
depth
,
json
::
parse_event_t
event
,
json
&
parsed
)
{
// skip object elements with key "Thumbnail"
if
(
event
==
json
::
parse_event_t
::
key
and
parsed
==
json
(
"Thumbnail"
))
{
return
false
;
}
else
{
return
true
;
}
};
// fill a stream with JSON text
ss
.
clear
();
ss
<<
text
;
// create JSON from stream (with callback)
json
j_filtered
(
ss
,
cb
);
std
::
cout
<<
std
::
setw
(
4
)
<<
j_filtered
<<
'\n'
;
}
\ No newline at end of file
doc/examples/basic_json__istream.link
0 → 100644
View file @
2c720b26
<a target="_blank" href="http://melpon.org/wandbox/permlink/lUltfC5TlmxeUq5X"><b>online</b></a>
\ No newline at end of file
doc/examples/basic_json__istream.output
0 → 100644
View file @
2c720b26
{
"Image": {
"Animated": false,
"Height": 600,
"IDs": [
116,
943,
234,
38793
],
"Thumbnail": {
"Height": 125,
"Url": "http://www.example.com/image/481989943",
"Width": 100
},
"Title": "View from 15th Floor",
"Width": 800
}
}
{
"Image": {
"Animated": false,
"Height": 600,
"IDs": [
116,
943,
234,
38793
],
"Title": "View from 15th Floor",
"Width": 800
}
}
src/json.hpp
View file @
2c720b26
...
...
@@ -1806,6 +1806,31 @@ class basic_json
}
}
/*!
@brief construct a JSON value given an input stream
@param[in,out] i stream to read a serialized JSON value from
@param[in] cb a parser callback function of type @ref parser_callback_t
which is used to control the deserialization by filtering unwanted values
(optional)
@complexity Linear in the length of the input. The parser is a predictive
LL(1) parser. The complexity can be higher if the parser callback function
@a cb has a super-linear complexity.
@note A UTF-8 byte order mark is silently ignored.
@liveexample{The example below demonstrates constructing a JSON value from
a `std::stringstream` with and without callback
function.,basic_json__istream}
@since version 2.0.0
*/
basic_json
(
std
::
istream
&
i
,
parser_callback_t
cb
=
nullptr
)
{
*
this
=
parser
(
i
,
cb
).
parse
();
}
///////////////////////////////////////
// other constructors and destructor //
///////////////////////////////////////
...
...
src/json.hpp.re2c
View file @
2c720b26
...
...
@@ -1806,6 +1806,31 @@ class basic_json
}
}
/*!
@brief construct a JSON value given an input stream
@param[in,out] i stream to read a serialized JSON value from
@param[in] cb a parser callback function of type @ref parser_callback_t
which is used to control the deserialization by filtering unwanted values
(optional)
@complexity Linear in the length of the input. The parser is a predictive
LL(1) parser. The complexity can be higher if the parser callback function
@a cb has a super-linear complexity.
@note A UTF-8 byte order mark is silently ignored.
@liveexample{The example below demonstrates constructing a JSON value from
a `std::stringstream` with and without callback
function.,basic_json__istream}
@since version 2.0.0
*/
basic_json(std::istream& i, parser_callback_t cb = nullptr)
{
*this = parser(i, cb).parse();
}
///////////////////////////////////////
// other constructors and destructor //
///////////////////////////////////////
...
...
test/unit.cpp
View file @
2c720b26
...
...
@@ -1264,6 +1264,42 @@ TEST_CASE("constructors")
}
}
}
SECTION
(
"create a JSON value from an input stream"
)
{
SECTION
(
"sts::stringstream"
)
{
std
::
stringstream
ss
;
ss
<<
"[
\"
foo
\"
,1,2,3,false,{
\"
one
\"
:1}]"
;
json
j
(
ss
);
CHECK
(
j
==
json
({
"foo"
,
1
,
2
,
3
,
false
,
{{
"one"
,
1
}}}));
}
SECTION
(
"with callback function"
)
{
std
::
stringstream
ss
;
ss
<<
"[
\"
foo
\"
,1,2,3,false,{
\"
one
\"
:1}]"
;
json
j
(
ss
,
[](
int
,
json
::
parse_event_t
,
const
json
&
val
)
{
// filter all number(2) elements
if
(
val
==
json
(
2
))
{
return
false
;
}
else
{
return
true
;
}
});
CHECK
(
j
==
json
({
"foo"
,
1
,
3
,
false
,
{{
"one"
,
1
}}}));
}
SECTION
(
"std::ifstream"
)
{
std
::
ifstream
f
(
"test/json_tests/pass1.json"
);
json
j
(
f
);
}
}
}
TEST_CASE
(
"other constructors and destructor"
)
...
...
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