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package
org
.
json
;
/*
Copyright (c) 2002 JSON.org
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
The Software shall be used for Good, not Evil.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
/**
* This provides static methods to convert comma delimited text into a
* JSONArray, and to convert a JSONArray into comma delimited text. Comma
* delimited text is a very popular format for data interchange. It is
* understood by most database, spreadsheet, and organizer programs.
* <p>
* Each row of text represents a row in a table or a data record. Each row
* ends with a NEWLINE character. Each row contains one or more values.
* Values are separated by commas. A value can contain any character except
* for comma, unless is is wrapped in single quotes or double quotes.
* <p>
* The first row usually contains the names of the columns.
* <p>
* A comma delimited list can be converted into a JSONArray of JSONObjects.
* The names for the elements in the JSONObjects can be taken from the names
* in the first row.
* @author JSON.org
* @version 2016-05-01
*/
public
class
CDL
{
/**
* Get the next value. The value can be wrapped in quotes. The value can
* be empty.
* @param x A JSONTokener of the source text.
* @return The value string, or null if empty.
* @throws JSONException if the quoted string is badly formed.
*/
private
static
String
getValue
(
JSONTokener
x
)
throws
JSONException
{
char
c
;
char
q
;
StringBuffer
sb
;
do
{
c
=
x
.
next
();
}
while
(
c
==
' '
||
c
==
'\t'
);
switch
(
c
) {
case
0
:
return
null
;
case
'"'
:
case
'\''
:
q
=
c
;
sb
=
new
StringBuffer
();
for
(;;) {
c
=
x
.
next
();
if
(
c
==
q
) {
//Handle escaped double-quote
char
nextC
=
x
.
next
();
if
(
nextC
!=
'\"'
) {
// if our quote was the end of the file, don't step
if
(
nextC
>
0
) {
x
.
back
();
}
break
;
}
}
if
(
c
==
0
||
c
==
'\n'
||
c
==
'\r'
) {
throw
x
.
syntaxError
(
"Missing close quote '"
+
q
+
"'."
);
}
sb
.
append
(
c
);
}
return
sb
.
toString
();
case
','
:
x
.
back
();
return
""
;
default
:
x
.
back
();
return
x
.
nextTo
(
','
);
}
}
/**
* Produce a JSONArray of strings from a row of comma delimited values.
* @param x A JSONTokener of the source text.
* @return A JSONArray of strings.
* @throws JSONException
*/
public
static
JSONArray
rowToJSONArray
(
JSONTokener
x
)
throws
JSONException
{
JSONArray
ja
=
new
JSONArray
();
for
(;;) {
String
value
=
getValue
(
x
);
char
c
=
x
.
next
();
if
(
value
==
null
||
(
ja
.
length
() ==
0
&&
value
.
length
() ==
0
&&
c
!=
','
)) {
return
null
;
}
ja
.
put
(
value
);
for
(;;) {
if
(
c
==
','
) {
break
;
}
if
(
c
!=
' '
) {
if
(
c
==
'\n'
||
c
==
'\r'
||
c
==
0
) {
return
ja
;
}
throw
x
.
syntaxError
(
"Bad character '"
+
c
+
"' ("
+
(
int
)
c
+
")."
);
}
c
=
x
.
next
();
}
}
}
/**
* Produce a JSONObject from a row of comma delimited text, using a
* parallel JSONArray of strings to provides the names of the elements.
* @param names A JSONArray of names. This is commonly obtained from the
* first row of a comma delimited text file using the rowToJSONArray
* method.
* @param x A JSONTokener of the source text.
* @return A JSONObject combining the names and values.
* @throws JSONException
*/
public
static
JSONObject
rowToJSONObject
(
JSONArray
names
,
JSONTokener
x
)
throws
JSONException
{
JSONArray
ja
=
rowToJSONArray
(
x
);
return
ja
!=
null
?
ja
.
toJSONObject
(
names
) :
null
;
}
/**
* Produce a comma delimited text row from a JSONArray. Values containing
* the comma character will be quoted. Troublesome characters may be
* removed.
* @param ja A JSONArray of strings.
* @return A string ending in NEWLINE.
*/
public
static
String
rowToString
(
JSONArray
ja
) {
StringBuilder
sb
=
new
StringBuilder
();
for
(
int
i
=
0
;
i
<
ja
.
length
();
i
+=
1
) {
if
(
i
>
0
) {
sb
.
append
(
','
);
}
Object
object
=
ja
.
opt
(
i
);
if
(
object
!=
null
) {
String
string
=
object
.
toString
();
if
(
string
.
length
() >
0
&& (
string
.
indexOf
(
','
) >=
0
||
string
.
indexOf
(
'\n'
) >=
0
||
string
.
indexOf
(
'\r'
) >=
0
||
string
.
indexOf
(
0
) >=
0
||
string
.
charAt
(
0
) ==
'"'
)) {
sb
.
append
(
'"'
);
int
length
=
string
.
length
();
for
(
int
j
=
0
;
j
<
length
;
j
+=
1
) {
char
c
=
string
.
charAt
(
j
);
if
(
c
>=
' '
&&
c
!=
'"'
) {
sb
.
append
(
c
);
}
}
sb
.
append
(
'"'
);
}
else
{
sb
.
append
(
string
);
}
}
}
sb
.
append
(
'\n'
);
return
sb
.
toString
();
}
/**
* Produce a JSONArray of JSONObjects from a comma delimited text string,
* using the first row as a source of names.
* @param string The comma delimited text.
* @return A JSONArray of JSONObjects.
* @throws JSONException
*/
public
static
JSONArray
toJSONArray
(
String
string
)
throws
JSONException
{
return
toJSONArray
(
new
JSONTokener
(
string
));
}
/**
* Produce a JSONArray of JSONObjects from a comma delimited text string,
* using the first row as a source of names.
* @param x The JSONTokener containing the comma delimited text.
* @return A JSONArray of JSONObjects.
* @throws JSONException
*/
public
static
JSONArray
toJSONArray
(
JSONTokener
x
)
throws
JSONException
{
return
toJSONArray
(
rowToJSONArray
(
x
),
x
);
}
/**
* Produce a JSONArray of JSONObjects from a comma delimited text string
* using a supplied JSONArray as the source of element names.
* @param names A JSONArray of strings.
* @param string The comma delimited text.
* @return A JSONArray of JSONObjects.
* @throws JSONException
*/
public
static
JSONArray
toJSONArray
(
JSONArray
names
,
String
string
)
throws
JSONException
{
return
toJSONArray
(
names
,
new
JSONTokener
(
string
));
}
/**
* Produce a JSONArray of JSONObjects from a comma delimited text string
* using a supplied JSONArray as the source of element names.
* @param names A JSONArray of strings.
* @param x A JSONTokener of the source text.
* @return A JSONArray of JSONObjects.
* @throws JSONException
*/
public
static
JSONArray
toJSONArray
(
JSONArray
names
,
JSONTokener
x
)
throws
JSONException
{
if
(
names
==
null
||
names
.
length
() ==
0
) {
return
null
;
}
JSONArray
ja
=
new
JSONArray
();
for
(;;) {
JSONObject
jo
=
rowToJSONObject
(
names
,
x
);
if
(
jo
==
null
) {
break
;
}
ja
.
put
(
jo
);
}
if
(
ja
.
length
() ==
0
) {
return
null
;
}
return
ja
;
}
/**
* Produce a comma delimited text from a JSONArray of JSONObjects. The
* first row will be a list of names obtained by inspecting the first
* JSONObject.
* @param ja A JSONArray of JSONObjects.
* @return A comma delimited text.
* @throws JSONException
*/
public
static
String
toString
(
JSONArray
ja
)
throws
JSONException
{
JSONObject
jo
=
ja
.
optJSONObject
(
0
);
if
(
jo
!=
null
) {
JSONArray
names
=
jo
.
names
();
if
(
names
!=
null
) {
return
rowToString
(
names
) +
toString
(
names
,
ja
);
}
}
return
null
;
}
/**
* Produce a comma delimited text from a JSONArray of JSONObjects using
* a provided list of names. The list of names is not included in the
* output.
* @param names A JSONArray of strings.
* @param ja A JSONArray of JSONObjects.
* @return A comma delimited text.
* @throws JSONException
*/
public
static
String
toString
(
JSONArray
names
,
JSONArray
ja
)
throws
JSONException
{
if
(
names
==
null
||
names
.
length
() ==
0
) {
return
null
;
}
StringBuffer
sb
=
new
StringBuffer
();
for
(
int
i
=
0
;
i
<
ja
.
length
();
i
+=
1
) {
JSONObject
jo
=
ja
.
optJSONObject
(
i
);
if
(
jo
!=
null
) {
sb
.
append
(
rowToString
(
jo
.
toJSONArray
(
names
)));
}
}
return
sb
.
toString
();
}
}
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