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https://issues.apache.org/jira/browse/CAMEL-24801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen reassigned CAMEL-24801:
-----------------------------------
Assignee: Claus Ibsen
> camel-sql - sql-stored: allow parentheses inside ${...} simple expressions in
> the template grammar
> --------------------------------------------------------------------------------------------------
>
> Key: CAMEL-24801
> URL: https://issues.apache.org/jira/browse/CAMEL-24801
> Project: Camel
> Issue Type: Improvement
> Components: camel-sql
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Priority: Major
>
> The sql-stored template grammar
> ({{components/camel-sql/src/main/java/org/apache/camel/component/sql/stored/template/grammar/sspt.jj}})
> rejects simple functions inside {{${...}}} parameters because the
> {{SIMPLE_EXP_TOKEN}} character set does not include parentheses:
> {code}
> <SIMPLE_EXP_TOKEN: "${"(<LETTER>|<DIGIT> | <SPECIAL> | " ")+ "}">
> <#SPECIAL: ([":","#","_","-","'",".","$","{","}","\"","[","]"])>
> {code}
> This works:
> {code}
> sql-stored:SCH_GetCalendarForPeriod( TIMESTAMP :#startDate, TIMESTAMP
> :#endDate, INTEGER ${header.notType})
> {code}
> This fails:
> {code}
> sql-stored:SCH_GetCalendarForPeriod( TIMESTAMP :#startDate, TIMESTAMP
> :#endDate, INTEGER ${val(1)})
> {code}
> with
> {noformat}
> org.apache.camel.component.sql.stored.template.ast.ParseRuntimeException:
> org.apache.camel.component.sql.stored.template.generated.ParseException:
> Encountered " <IDENTIFIER> "${val "" at line 1, column 83. Was expecting one
> of: <SIMPLE_EXP_TOKEN> ... <PARAMETER_POS_TOKEN> ... <PARAMETER_NAME> ...
> {noformat}
> Since {{$}} and {{{}} are in {{SPECIAL}}, the lexer falls back to matching
> {{${val}} as an {{IDENTIFIER}} and then chokes on {{(}}. The evaluation side
> is not the problem: {{InParameter}} / {{InOutParameter}} hand the whole token
> string to the simple language, so any function would work once it gets
> through the lexer.
> Proposal: add {{(}} and {{)}} to the {{SIMPLE_EXP_TOKEN}} character set. This
> is safe with JavaCC longest-match because the token must end with {{}}}, so
> {{${val(1)})}} stops at the {{}}} before the procedure's closing parenthesis.
> It enables single-argument built-in functions such as {{${val(1)}}},
> {{${bodyAs(String)}}}, and custom simple functions taking one argument.
> Scope: this is deliberately *not* full simple support. Commas cannot be added
> to the token (longest match would turn {{${a}, INTEGER ${b}}} into one
> token), so multi-argument functions like {{${replace(a,b)}}} and nested
> functions remain unsupported in the template. Users needing those should
> compute the value into a header first and reference it with {{${header.xxx}}}.
> Add test cases to {{ParserTest}} / {{TemplateParserLexicalErrorTest}} and
> document the supported subset in the sql-stored component docs.
> Reported by a user on Zulip.
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