Parsing JSON with groovy LAX parser gives wrong keys
I have some config files in JSON format, and I need to parse them in a program written in groovy. Since the files should be human readable, I'd like to use the LAX syntax (and parser) so that I do not need to wrap every key and value in quotation marks and also can use comments.
But somehow, when I parse a JSON file, I get wrong keys in the resulting map.
Here is an example.
The JSON file (I saved it as a.json) is
{
key1: aaa,
key2: bbb
}
The program to parse it is
package test.json;
import groovy.json.JsonParserType;
import groovy.json.JsonSlurper;
public class JsonParser {
static void main(String args) {
JsonSlurper slurper = new JsonSlurper().setType(JsonParserType.LAX)
def config = slurper.parse(new File('a.json'))
println "key1: ${config.key1}"
println "key2: ${config.key2}"
for (e in config) {
println "*** '${e.key}' (${e.key.class}) = '${e.value}' (${e.value.class})"
}
}
}
When I execute the program, I get the following output:
key1: aaa
key2: null
*** 'key1' (class java.lang.String) = 'aaa' (class java.lang.String)
*** '
key2' (class java.lang.String) = 'bbb
' (class java.lang.String)
You see that the second key is not parsed as 'key2' but includes spaces and a line break.
How can I make the parser to remove the spaces from the keys and values so that I get 'key2'='bbb' (as I'd expect for the file above)?
If I enclose each key and value in double quotation marks, everything is parsed as expected, i.e. I get 'key2'='bbb'. But I thought with the LAX parser I'd not need them.
json parsing groovy
asked Nov 21 '18 at 22:12
fml2fml2
465
add a comment |
I have some config files in JSON format, and I need to parse them in a program written in groovy. Since the files should be human readable, I'd like to use the LAX syntax (and parser) so that I do not need to wrap every key and value in quotation marks and also can use comments.
But somehow, when I parse a JSON file, I get wrong keys in the resulting map.
Here is an example.
The JSON file (I saved it as a.json) is
{
key1: aaa,
key2: bbb
}
The program to parse it is
package test.json;
import groovy.json.JsonParserType;
import groovy.json.JsonSlurper;
public class JsonParser {
static void main(String args) {
JsonSlurper slurper = new JsonSlurper().setType(JsonParserType.LAX)
def config = slurper.parse(new File('a.json'))
println "key1: ${config.key1}"
println "key2: ${config.key2}"
for (e in config) {
println "*** '${e.key}' (${e.key.class}) = '${e.value}' (${e.value.class})"
}
}
}
When I execute the program, I get the following output:
key1: aaa
key2: null
*** 'key1' (class java.lang.String) = 'aaa' (class java.lang.String)
*** '
key2' (class java.lang.String) = 'bbb
' (class java.lang.String)
You see that the second key is not parsed as 'key2' but includes spaces and a line break.
How can I make the parser to remove the spaces from the keys and values so that I get 'key2'='bbb' (as I'd expect for the file above)?
If I enclose each key and value in double quotation marks, everything is parsed as expected, i.e. I get 'key2'='bbb'. But I thought with the LAX parser I'd not need them.
json parsing groovy
asked Nov 21 '18 at 22:12
fml2fml2
465
I couldn't reproduce the problem you have shown in the question. I took the file content you have pasted and the code you added - Groovy 2.4, 2.5 and 3.0-alpha executed as expected. I would suggest checking the input file - maybe there is some character that breakskey2to the next line. Try the same sample but with JSON as a string variable passed toslurper.parseText(). And check the input file character encoding. LAX parser works as you described, it does not add any new line character. If you see it, it means it exists in the input file somehow.
– Szymon Stepniak
Nov 21 '18 at 23:07
Thank you for the suggestion. I tried it (parsing the text from a string variable) and it worked. Then I switched back to the file, but placed both values on the same line -- and it worked. So I assumed it should somehow depend on newlines. I changed the newline to UNIX style (LF only) -- and it works! I don't understand why it doesn't work with Windows style newlines (CR, LF). For the reference: I use groovy 2.4.15, and I'm on a Windows platform.
– fml2
Nov 22 '18 at 6:08
add a comment |
I have some config files in JSON format, and I need to parse them in a program written in groovy. Since the files should be human readable, I'd like to use the LAX syntax (and parser) so that I do not need to wrap every key and value in quotation marks and also can use comments.
But somehow, when I parse a JSON file, I get wrong keys in the resulting map.
Here is an example.
The JSON file (I saved it as a.json) is
{
key1: aaa,
key2: bbb
}
The program to parse it is
package test.json;
import groovy.json.JsonParserType;
import groovy.json.JsonSlurper;
public class JsonParser {
static void main(String args) {
JsonSlurper slurper = new JsonSlurper().setType(JsonParserType.LAX)
def config = slurper.parse(new File('a.json'))
println "key1: ${config.key1}"
println "key2: ${config.key2}"
for (e in config) {
println "*** '${e.key}' (${e.key.class}) = '${e.value}' (${e.value.class})"
}
}
}
When I execute the program, I get the following output:
key1: aaa
key2: null
*** 'key1' (class java.lang.String) = 'aaa' (class java.lang.String)
*** '
key2' (class java.lang.String) = 'bbb
' (class java.lang.String)
You see that the second key is not parsed as 'key2' but includes spaces and a line break.
How can I make the parser to remove the spaces from the keys and values so that I get 'key2'='bbb' (as I'd expect for the file above)?
If I enclose each key and value in double quotation marks, everything is parsed as expected, i.e. I get 'key2'='bbb'. But I thought with the LAX parser I'd not need them.
json parsing groovy
asked Nov 21 '18 at 22:12
fml2fml2
465
I have some config files in JSON format, and I need to parse them in a program written in groovy. Since the files should be human readable, I'd like to use the LAX syntax (and parser) so that I do not need to wrap every key and value in quotation marks and also can use comments.
But somehow, when I parse a JSON file, I get wrong keys in the resulting map.
Here is an example.
The JSON file (I saved it as a.json) is
{
key1: aaa,
key2: bbb
}
The program to parse it is
package test.json;
import groovy.json.JsonParserType;
import groovy.json.JsonSlurper;
public class JsonParser {
static void main(String args) {
JsonSlurper slurper = new JsonSlurper().setType(JsonParserType.LAX)
def config = slurper.parse(new File('a.json'))
println "key1: ${config.key1}"
println "key2: ${config.key2}"
for (e in config) {
println "*** '${e.key}' (${e.key.class}) = '${e.value}' (${e.value.class})"
}
}
}
When I execute the program, I get the following output:
key1: aaa
key2: null
*** 'key1' (class java.lang.String) = 'aaa' (class java.lang.String)
*** '
key2' (class java.lang.String) = 'bbb
' (class java.lang.String)
You see that the second key is not parsed as 'key2' but includes spaces and a line break.
How can I make the parser to remove the spaces from the keys and values so that I get 'key2'='bbb' (as I'd expect for the file above)?
If I enclose each key and value in double quotation marks, everything is parsed as expected, i.e. I get 'key2'='bbb'. But I thought with the LAX parser I'd not need them.
json parsing groovy
json parsing groovy
asked Nov 21 '18 at 22:12
fml2fml2
465
asked Nov 21 '18 at 22:12
fml2fml2
465
asked Nov 21 '18 at 22:12
fml2fml2
465
asked Nov 21 '18 at 22:12
fml2fml2
465
asked Nov 21 '18 at 22:12
fml2fml2
465
465
I couldn't reproduce the problem you have shown in the question. I took the file content you have pasted and the code you added - Groovy 2.4, 2.5 and 3.0-alpha executed as expected. I would suggest checking the input file - maybe there is some character that breakskey2to the next line. Try the same sample but with JSON as a string variable passed toslurper.parseText(). And check the input file character encoding. LAX parser works as you described, it does not add any new line character. If you see it, it means it exists in the input file somehow.
– Szymon Stepniak
Nov 21 '18 at 23:07
Thank you for the suggestion. I tried it (parsing the text from a string variable) and it worked. Then I switched back to the file, but placed both values on the same line -- and it worked. So I assumed it should somehow depend on newlines. I changed the newline to UNIX style (LF only) -- and it works! I don't understand why it doesn't work with Windows style newlines (CR, LF). For the reference: I use groovy 2.4.15, and I'm on a Windows platform.
– fml2
Nov 22 '18 at 6:08
add a comment |
I couldn't reproduce the problem you have shown in the question. I took the file content you have pasted and the code you added - Groovy 2.4, 2.5 and 3.0-alpha executed as expected. I would suggest checking the input file - maybe there is some character that breakskey2to the next line. Try the same sample but with JSON as a string variable passed toslurper.parseText(). And check the input file character encoding. LAX parser works as you described, it does not add any new line character. If you see it, it means it exists in the input file somehow.
– Szymon Stepniak
Nov 21 '18 at 23:07
Thank you for the suggestion. I tried it (parsing the text from a string variable) and it worked. Then I switched back to the file, but placed both values on the same line -- and it worked. So I assumed it should somehow depend on newlines. I changed the newline to UNIX style (LF only) -- and it works! I don't understand why it doesn't work with Windows style newlines (CR, LF). For the reference: I use groovy 2.4.15, and I'm on a Windows platform.
– fml2
Nov 22 '18 at 6:08
I couldn't reproduce the problem you have shown in the question. I took the file content you have pasted and the code you added - Groovy 2.4, 2.5 and 3.0-alpha executed as expected. I would suggest checking the input file - maybe there is some character that breaks
key2 to the next line. Try the same sample but with JSON as a string variable passed to slurper.parseText(). And check the input file character encoding. LAX parser works as you described, it does not add any new line character. If you see it, it means it exists in the input file somehow.– Szymon Stepniak
Nov 21 '18 at 23:07
I couldn't reproduce the problem you have shown in the question. I took the file content you have pasted and the code you added - Groovy 2.4, 2.5 and 3.0-alpha executed as expected. I would suggest checking the input file - maybe there is some character that breaks
key2 to the next line. Try the same sample but with JSON as a string variable passed to slurper.parseText(). And check the input file character encoding. LAX parser works as you described, it does not add any new line character. If you see it, it means it exists in the input file somehow.– Szymon Stepniak
Nov 21 '18 at 23:07
Thank you for the suggestion. I tried it (parsing the text from a string variable) and it worked. Then I switched back to the file, but placed both values on the same line -- and it worked. So I assumed it should somehow depend on newlines. I changed the newline to UNIX style (LF only) -- and it works! I don't understand why it doesn't work with Windows style newlines (CR, LF). For the reference: I use groovy 2.4.15, and I'm on a Windows platform.
– fml2
Nov 22 '18 at 6:08
Thank you for the suggestion. I tried it (parsing the text from a string variable) and it worked. Then I switched back to the file, but placed both values on the same line -- and it worked. So I assumed it should somehow depend on newlines. I changed the newline to UNIX style (LF only) -- and it works! I don't understand why it doesn't work with Windows style newlines (CR, LF). For the reference: I use groovy 2.4.15, and I'm on a Windows platform.
– fml2
Nov 22 '18 at 6:08
add a comment |
1 Answer
1
active
oldest
votes
This works for me now, the clue is to use the normalize() method:
def json = new File('a.json').text.normalize()
def config = slurper.parseText(json)
answered Nov 22 '18 at 20:25
fml2fml2
465
add a comment |
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1 Answer
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active
oldest
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oldest
votes
active
oldest
votes
This works for me now, the clue is to use the normalize() method:
def json = new File('a.json').text.normalize()
def config = slurper.parseText(json)
answered Nov 22 '18 at 20:25
fml2fml2
465
add a comment |
This works for me now, the clue is to use the normalize() method:
def json = new File('a.json').text.normalize()
def config = slurper.parseText(json)
answered Nov 22 '18 at 20:25
fml2fml2
465
add a comment |
This works for me now, the clue is to use the normalize() method:
def json = new File('a.json').text.normalize()
def config = slurper.parseText(json)
answered Nov 22 '18 at 20:25
fml2fml2
465
This works for me now, the clue is to use the normalize() method:
def json = new File('a.json').text.normalize()
def config = slurper.parseText(json)
answered Nov 22 '18 at 20:25
fml2fml2
465
answered Nov 22 '18 at 20:25
fml2fml2
465
answered Nov 22 '18 at 20:25
fml2fml2
465
answered Nov 22 '18 at 20:25
fml2fml2
465
465
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I couldn't reproduce the problem you have shown in the question. I took the file content you have pasted and the code you added - Groovy 2.4, 2.5 and 3.0-alpha executed as expected. I would suggest checking the input file - maybe there is some character that breaks
key2to the next line. Try the same sample but with JSON as a string variable passed toslurper.parseText(). And check the input file character encoding. LAX parser works as you described, it does not add any new line character. If you see it, it means it exists in the input file somehow.– Szymon Stepniak
Nov 21 '18 at 23:07
Thank you for the suggestion. I tried it (parsing the text from a string variable) and it worked. Then I switched back to the file, but placed both values on the same line -- and it worked. So I assumed it should somehow depend on newlines. I changed the newline to UNIX style (LF only) -- and it works! I don't understand why it doesn't work with Windows style newlines (CR, LF). For the reference: I use groovy 2.4.15, and I'm on a Windows platform.
– fml2
Nov 22 '18 at 6:08