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Posted to commits@daffodil.apache.org by "Steve Lawrence (Jira)" <ji...@apache.org> on 2021/08/09 14:58:00 UTC
[jira] [Created] (DAFFODIL-2553) dfdl:occursCountKind aborts with
invalid path expression to array
Steve Lawrence created DAFFODIL-2553:
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Summary: dfdl:occursCountKind aborts with invalid path expression to array
Key: DAFFODIL-2553
URL: https://issues.apache.org/jira/browse/DAFFODIL-2553
Project: Daffodil
Issue Type: Bug
Components: Front End
Affects Versions: 2.4.0
Reporter: Steve Lawrence
This invalid schema causes an abort when trying to compile:
{code:xml}
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:dfdl="http://www.ogf.org/dfdl/dfdl-1.0/">
<xs:include schemaLocation="org/apache/daffodil/xsd/DFDLGeneralFormat.dfdl.xsd"/>
<xs:annotation>
<xs:appinfo source="http://www.ogf.org/dfdl/">
<dfdl:format ref="GeneralFormat" lengthKind="delimited" />
</xs:appinfo>
</xs:annotation>
<xs:element name="root">
<xs:complexType>
<xs:sequence>
<xs:element name="arr1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="field1" type="xs:string" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="arr2" type="xs:string" maxOccurs="unbounded"
dfdl:occursCountKind="expression"
dfdl:occursCount="{ xs:unsignedLong(../arr1[DNE]/field1) }" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
{code}
The dfdl:occursCount expression has an invalid path--the DNE index step does not exist. But instead of getting a helpful error message, we get this abort when compiling:
{code}
org.apache.daffodil.exceptions.Abort: Invariant broken: RelativePathExpression.this.steps2.apply(0).isInstanceOf[org.apache.daffodil.dpath.Up]
org.apache.daffodil.exceptions.Assert$.abort(Assert.scala:137)
org.apache.daffodil.dpath.RelativePathExpression.adjustedSteps$lzycompute(Expression.scala:820)
org.apache.daffodil.dpath.RelativePathExpression.adjustedSteps(Expression.scala:813)
org.apache.daffodil.dpath.RelativePathExpression.compiledDPath$lzycompute(Expression.scala:827)
at org.apache.daffodil.exceptions.Assert$.abort(Assert.scala:137)
at org.apache.daffodil.dpath.RelativePathExpression.adjustedSteps$lzycompute(Expression.scala:820)
at org.apache.daffodil.dpath.RelativePathExpression.adjustedSteps(Expression.scala:813)
at org.apache.daffodil.dpath.RelativePathExpression.compiledDPath$lzycompute(Expression.scala:827)
at org.apache.daffodil.dpath.RelativePathExpression.compiledDPath(Expression.scala:826)
at org.apache.daffodil.dpath.PredicateExpression.compiledDPath$lzycompute(Expression.scala:1294)
at org.apache.daffodil.dpath.PredicateExpression.compiledDPath(Expression.scala:1294)
at org.apache.daffodil.dpath.NamedStep.downwardStep$lzycompute(Expression.scala:1181)
at org.apache.daffodil.dpath.NamedStep.downwardStep(Expression.scala:1176)
at org.apache.daffodil.dpath.NamedStep.compiledDPath$lzycompute(Expression.scala:1167)
at org.apache.daffodil.dpath.NamedStep.compiledDPath(Expression.scala:1166)
at org.apache.daffodil.dpath.RelativePathExpression.$anonfun$compiledDPath$3(Expression.scala:828)
...
{code}
This seems to be specific to the {{dfdl:occursCount}} expression. We should get an error about invalid path step "DNE".
I've tested this same bad expression with dfdl:inputValueCalc and dfdl:length, and get an appropriate error message. Changing {{DNE}} to {{1}} also allows the schema compile.
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