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* eval.c (eval_init): Fix up registration of split-str to
account for new parameter.
* lib.c (split_str_keep): Implement new optional count
argument.
(spl): Pass nil value to split_str_keep for new argument.
I'd like this function to benefit from this argument also,
but the design isn't settled.
(split_str): Pass nil argument to split_str_keep.
* lib.h (split_str_keep): Declaration updated.
* tests/015/split.tl: New tests.
* txr.1: Documented.
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* lib.c (join_with): Pass the correct onech array down to
cat_str_init, rather than a null pointer.
* tests/015/split.tl: New tests covering join and join-with.
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The problem is that when the regular expression
is capable of matching empty strings, tok-str
will extract an empty token immediately following
a non-empty token. For instance (tok-str "a,b" /[^,]*/)
extracts ("a" "" "b") instead of just ("a" "b").
This is a poor behavior and the way to fix it is to
impose a rule that an empty token must not be extracted
immediately at the ending position of a previous token.
Only a non-empty token can be consecutive to a token.
* lib.c (tok_str): Rewrite the logic of the loop,
using the prev_empty flag to suppress empty tokens
which immediately follow non-empty tokens. The
addition of 1 to the position when the token is empty
to skip a character is done at the bottom of the loop
and a new last_end variable keeps track of the end position
of the last extracted token for the purposes of extracting
the keep-between area if keep_sep is true. The old loop
is preserved intact and enabled by compatibility.
* tests/015/split.tl: Multiple empty-regex test cases for
tok-str updated.
* txr.1: Updated tok-str documentation and also added
a note between the conditions under which split-str and
tok-str, invoked with keep-sep true, produce equivalent
output. Added compatibility notes.
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* tests/015/split.tl: New cases added.
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* Makefile (TXR_DBG_OPTS): Disable for tst/tests/015.
* tests/common.tl (mtest): New macro.
* tests/015/split.tl: New file.
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