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* share/txr/stdlib/match.tl (compile-hash-match): Follow
rename of is-pattern function to non-triv-pat-p.
(is-pattern): Renamed to non-triv-pat-p, to follow terminology
in the reference manual. A bug is fixed here: we must
recognize cons patterns with operators and variables in the
dotted position as non-trivial.
* tests/011/patmatch.tl: New hash test case, from doc.
* txr.1: Documented hash pattern operator.
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This commit fixes the inadequacy that all variables occurring
in a pattern under @(all ...) or @(coll ...) are blindly
collated into lists, ignoring the fact that they may be
previously bound variables that must back-reference and not be
colleced into lists (just like in the TXR Pattern language!)
* share/txr/stdlib/match.tl (compile-loop-match): Calculate
the subset of variables in the pattern that have been freshly
bound. Only generate the collection gensyms for those
variables and only collect and nreverse those variables.
* tests/011/patmatch.tl: Some test cases that backreference
into an @(all).
* txr.1: Documented.
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* share/txr/stdlib/match.tl (compile-loop-match): Implement
coll semantics. coll fails if it collects nothing, which
uses common logic with all*. We just have to move the
flipping of the loop-iterated-var into the match, and not
do it unconditionally for every iteration.
(compile-match): Hook in the coll operator.
* tests/011/patmatch.tl: Test case copied from doc example.
* txr.1: Documented.
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* tests/011/patmatch.tl: Add test case matching with two
structures in circular relationship, and a loop around
match case for various cases involving backreference.
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* share/txr/stdlib/match.tl (compile-parallel-match): Just
like what was done in compile-loop-match in the prior commit,
we fix the situation here. guard1's guard-expr, in which the
matching logic actually happens, becomes the main test-expr.
Thus guard1 disappears and guard0 is renamed to the one and
only guard.
* tests/011/patmatch.tl: Added test case which is fixed
by this.
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This is caused by the way the loop match compiler moves the
matching logic into a guard, which causes a re-ordering of the
variable assignments which interferes with backreferencing
when @(some) is embedded into a @(let), and probably other
situations. The issues is that the backreferencing equal
tests can be reordered to occur before the assignment which
sets the intial value of the backreferenced variable:
cart before the horse kind of thing.
* share/txr/stdlib/match.tl (compile-loop-match): Do not add
the submatch into the guard sequence. Thus guard1's vars and
var-exprs, move into into the main compiled-match,
and guard1's guard-expr moves into guard0. Thus guard1
disappears, guard0 becomes guard.
* tests/011/patmatch.tl: New test case that is also fixed,
and which was not fixed by a different approach to the problem
that I scrapped.
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* tests/011/patmatch.tl: New test showing breakage whereby
a variable inside the @(some ...) operator is not able
to unify against a surrounding let variable.
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* tests/011/patmatch.tl: Breaking test case added. The @(some)
pattern match has the same vars misalignment problem.
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* tests/011/patmatch.tl: New weirdly failing test case. The
@(and @a @b) is important; if that term is replaced by a
simple @a, then the correct datum is bound to c.
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* tests/011/patmatch.tl: Add match-case test.
* txr.1: Document when-match, if-match and match-case.
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* tests/011/patmatch.tl: New file.
* tests/011/patmatch.expected: Likewise.
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