https://bugs.linuxfoundation.org/show_bug.cgi?id=1334
Bug ID: 1334
Summary: Simplify grammar in Appendix IV?
Product: SPDX
Version: 2.0
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: Spec
Assignee: [email protected]
Reporter: [email protected]
Classification: Unclassified
>From David Wheeler on December 4, 2015
The current Appendix IV is also overly complex and confusing:
* There's no need to have "compound-expression" as separate from
"license-expression".
The "license-expression" is defined to be either simple or compound, but a
simple-expression is also a legal compound-expression, so the whole indirection
is unnecessary and confusing.
* In simple-expression, the "+" should just optionally follow license-id;
that's how anyone would parse it, and it's easier to explain too.
So I suggest replacing simple-expression, compound-expression (to be removed),
and license-expression with this simpler spec:
simple-expression = license-id ["+"] / license-ref
license-expression = simple-expression [ "WITH" license-exception-id ] /
license-expression "AND" license-expression /
license-expression "OR" license-expression /
"(" license-expression ")"
You could change simple-expression to be:
simple-expression = license-id ["+"][ "WITH" license-exception-id ] /
license-ref and omit the ["WITH...] in the following line, but I *like* the
idea of allowing a license-ref with a standard exception. Besides, that's
currently allowed, no reason to *remove* this functionality.
Both this and the original description are silent about left-to-right or
right-to-left; I don't think it matters, but if someone wants things to be
parsed identically, perhaps that should be mentioned.
I can imagine adding suffixes like "!" (I'm *sure* it's only this particular
version of the license) or "?" (I'm *not* sure that it's limited to this
particular version of the license), in addition to "+".
However, that's a separate discussion.
Also: is there any reason to *FORBID* the "+" suffix after a license-ref or
license-exception-id?
In particular, someone might use a license-ref while waiting for a license to
be added to the SPDX license list or exception list.
A way Would change my proposal grammar above to:
simple-expression = license-id / license-ref
license-expression = simple-expression ["+"] [ "WITH" license-exception-id
["+"] ] /
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