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https://issues.apache.org/jira/browse/DAFFODIL-1443?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Beckerle updated DAFFODIL-1443:
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Priority: Minor (was: Blocker)
> escapeCharacter expression evaluated when lengthKind 'delimited' on complex
> element when there are no delimiters
> ----------------------------------------------------------------------------------------------------------------
>
> Key: DAFFODIL-1443
> URL: https://issues.apache.org/jira/browse/DAFFODIL-1443
> Project: Daffodil
> Issue Type: Bug
> Components: Compatibility, Front End, Performance
> Affects Versions: 1.1.0
> Reporter: Michael Beckerle
> Priority: Minor
> Labels: ForInteroperabilityTest
> Fix For: 2.4.0
>
>
> I'm trying to get EDIFACT working on Daffodil.
> This schema uses dfdl:escapeCharacter and dfdl:escapeEscapeCharacter as
> expressions. E.g., there is a top-level dfdl:defineVariable named
> "EscapeChar" which has a default value, and the expression for the
> dfdl:escapeCharacter property is { $ibmEdiFmt:EscapeChar }.
> The default format that is in effect for the root element 'Interchange' has
> dfdl:lengthKind='delimited'.
> When daffodil starts parsing the top level root/document element, it enters a
> parser that is for delimited elements with an escape-scheme in effect. First
> thing this parser does is get the escape scheme which evaluates the
> expressions for escapeCharacter and escapeEscapeCharacter. This picks up the
> default values for those variables and the variables are then set as "already
> evaluated", as DFDL specifies that once a variable's default value has been
> used, it cannot be subsequently set via dfdl:setVariable.
> Now, when the very first UNA is encountered, that reads the various
> delimiters/escapes from the data, and tries to set the variables.
> But the variables have already been evaluated, on the way into parsing the
> "delimited" top level element.
> So it fails with a runtime SDE - default value has already been used for
> EscapeChar variable.
> So this clearly a bug.
> The principle is that a complex-typed element of length kind delimited when
> there is no definition of terminator nor applicable separator, that this
> situation is treated like dfdl:lengthKind='implicit' and the escapeScheme is
> therefore not relevant and the expressions for the escapeScheme characters
> MUST NOT be evaluated.
> One could argue that the EDIFACT schema should have
> dfdl:lengthKind='implicit' on the 'Interchange' element and any other complex
> type element, but this is quite burdensome on the schema author, who
> after-all thinks of this entire format as "delimited stuff".
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