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https://issues.apache.org/jira/browse/JENA-632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15950875#comment-15950875
]
ASF GitHub Bot commented on JENA-632:
-------------------------------------
Github user kinow commented on a diff in the pull request:
https://github.com/apache/jena/pull/114#discussion_r109143318
--- Diff: jena-arq/Grammar/master.jj ---
@@ -327,6 +359,35 @@ void AskQuery() : {}
SolutionModifier()
}
+void JsonQuery() : {}
+{
+ JsonClause()
+ ( DatasetClause() )*
+ WhereClause()
+ SolutionModifier()
+}
+
+void JsonClause() : { Object o ; String s ; }
+{
+ <JSON> { getQuery().setQueryJsonType() ; }
+ <LBRACE>
+ s = String() < PNAME_NS >
+ (
--- End diff --
Replying to my previous comment. The reason why we are not using COLON, is
that we get this error:
```
[2017-04-01 00:44:24] Fuseki INFO [1] Query = JSON { "name" : ?name }
WHERE { ?name ?a ?b } LIMIT 2
[2017-04-01 00:44:24] Fuseki INFO [1] 400 Parse error:
JSON { "name" : ?name } WHERE { ?name ?a ?b } LIMIT 2
Encountered " <PNAME_NS> ": "" at line 1, column 15.
Was expecting:
":" ...
(27 ms)
```
The PNAME_NS (which is <PNAME_NS: (<PN_PREFIX>)? ":" >) matches the colon,
probably for the default namespace declaration. And probably because PNAME_NS
is declared before COLON.
Maybe moving COLON before PNAME_NS, and using COLON in the PNAME_NS rule
declaration? Not sure if that could introduce other unwanted bugs.
For the time being going with Andy's suggestion to indicate when we were
expecting a COLON, and actually have something matching PNAME_NS.
> Generate JSON from SPARQL directly.
> -----------------------------------
>
> Key: JENA-632
> URL: https://issues.apache.org/jira/browse/JENA-632
> Project: Apache Jena
> Issue Type: Improvement
> Components: ARQ, Fuseki
> Reporter: Andy Seaborne
> Assignee: Bruno P. Kinoshita
> Priority: Minor
> Labels: java, javacc
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> The capability to generate JSON directly from a SPARQL (or extended SPARQL)
> query would enable the creation of JSON data API over published linked data.
> This project would cover:
> # Design and publication of a design.
> # Refinement of design based on community feed
> # Implementation, including testing.
> # Refinement of implementation based on community feed
> Skills required: Java, some parser work, design and discussion with the user
> community, basic understanding of HTTP and content negotiation.
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