Bug #6346
closed
NPE with replace() on SaxonJS2.6 when exported under 4.0-support conditions
0%
Description
When exporting a stylesheet (either 3.0 or 4.0) for SaxonJS 2.6, using SaxonEE 12.4 running under --allowSyntaxExtensions:on,
a three-argument call on replace() (that is with the fourth $flags argument to default to the empty string), at runtime a null pointer expection is thrown when attempting to retrieve the flags:
const flags = args[3] ? args[3].next().toString() : "";
The next() returns a null.
Without allowSyntaxExtensions or with the fourth argument supplied, the function behaves as expected.
Sample stylesheet, compiled SEF and web page attached
Files
Updated by Debbie Lockett 9 months ago
Basically, SaxonJS 2 does not support 4.0 syntax, so exporting for -target:JS from 12.4 with --allowSyntaxExtensions:on is not supported.
As you have found, although the stylesheet may compile, it will not necessarily run. I think this is a Saxon 12 bug, rather than a SaxonJS bug. We should add something in the documentation to clarify this (i.e. you can't use 4.0 syntax and --allowSyntaxExtensions:on when exporting for SaxonJS 2). Also it would be better if this was clearer at compile time - i.e. the compile should fail, or at least produce a warning.
Updated by Debbie Lockett 6 months ago
- Category set to Documentation
- Status changed from New to Closed
- Assignee set to Debbie Lockett
The problem was belatedly raised as Saxon Bug #6433: Forbid enabling 4.0 and specifying an SEF target of JS2/3, which has been resolved on the saxon12 branch and will be fixed in the next maintenance release 12.5.
I've added a note in the SaxonJS documentation to state that 4.0 language extensions are not supported in SaxonJS (at https://www.saxonica.com/saxon-js/documentation2/index.html#!ixsl-extension/saxon-extensions).
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