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java/src/main/java/com/jsoniter/IterImplString.java at master · structure/java · GitHub
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/
jsoniter
/
IterImplString.java
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/
jsoniter
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IterImplString.java
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/*
this implementations contains significant code from https://github.com/ngs-doo/dsl-json/blob/master/LICENSE
Copyright (c) 2015, Nova Generacija Softvera d.o.o.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of Nova Generacija Softvera d.o.o. nor the names of its
contributors may be used to endorse or promote products derived from this
software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package
com
.
jsoniter
;
import
java
.
io
.
IOException
;
class
IterImplString
{
final
static
int
[]
hexDigits
=
new
int
[
'f'
+
1
];
static
{
for
(
int
i
=
0
;
i
<
hexDigits
.
length
;
i
++) {
hexDigits
[
i
] = -
1
;
}
for
(
int
i
=
'0'
;
i
<=
'9'
; ++
i
) {
hexDigits
[
i
] = (
i
-
'0'
);
}
for
(
int
i
=
'a'
;
i
<=
'f'
; ++
i
) {
hexDigits
[
i
] = ((
i
-
'a'
) +
10
);
}
for
(
int
i
=
'A'
;
i
<=
'F'
; ++
i
) {
hexDigits
[
i
] = ((
i
-
'A'
) +
10
);
}
}
public
static
final
String
readString
(
JsonIterator
iter
)
throws
IOException
{
byte
c
=
IterImpl
.
nextToken
(
iter
);
if
(
c
!=
'"'
) {
if
(
c
==
'n'
) {
IterImpl
.
skipFixedBytes
(
iter
,
3
);
return
null
;
}
throw
iter
.
reportError
(
"readString"
,
"expect string or null, but "
+ (
char
)
c
);
}
int
j
=
parse
(
iter
);
return
new
String
(
iter
.
reusableChars
,
0
,
j
);
}
private
static
int
parse
(
JsonIterator
iter
)
throws
IOException
{
byte
c
;
// try fast path first
int
i
=
iter
.
head
;
// this code will trigger jvm hotspot pattern matching to highly optimized assembly
int
bound
=
iter
.
reusableChars
.
length
;
bound
=
IterImpl
.
updateStringCopyBound
(
iter
,
bound
);
for
(
int
j
=
0
;
j
<
bound
;
j
++) {
c
=
iter
.
buf
[
i
++];
if
(
c
==
'"'
) {
iter
.
head
=
i
;
return
j
;
}
// If we encounter a backslash, which is a beginning of an escape sequence
// or a high bit was set - indicating an UTF-8 encoded multibyte character,
// there is no chance that we can decode the string without instantiating
// a temporary buffer, so quit this loop
if
((
c
^
'\\'
) <
1
) {
break
;
}
iter
.
reusableChars
[
j
] = (
char
)
c
;
}
int
alreadyCopied
=
0
;
if
(
i
>
iter
.
head
) {
alreadyCopied
=
i
-
iter
.
head
-
1
;
iter
.
head
=
i
-
1
;
}
return
IterImpl
.
readStringSlowPath
(
iter
,
alreadyCopied
);
}
public
static
int
translateHex
(
final
byte
b
) {
int
val
=
hexDigits
[
b
];
if
(
val
== -
1
) {
throw
new
IndexOutOfBoundsException
(
b
+
" is not valid hex digit"
);
}
return
val
;
}
// slice does not allow escape
final
static
int
findSliceEnd
(
JsonIterator
iter
) {
for
(
int
i
=
iter
.
head
;
i
<
iter
.
tail
;
i
++) {
byte
c
=
iter
.
buf
[
i
];
if
(
c
==
'"'
) {
return
i
+
1
;
}
else
if
(
c
==
'\\'
) {
throw
iter
.
reportError
(
"findSliceEnd"
,
"slice does not support escape char"
);
}
}
return
-
1
;
}
}
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