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* share/txr/stdlib/awk.tl (sys:awk%--rng, sys:awk%--rng-,
sys:awk%rng+, sys:awk%-rng+, sys:awk%--rng+): New functions.
(sys:awk-mac-let): Rewritten range expander. The four basic
ranges rng, rng-, -rng and -rng- are handled with in-line
expansion, because by doing that we avoid unnecessarily
evaluating the from-expression. The remaining cases expand
to function calls to the new functions, which receive the
flag vector, the index position in that vector and the values
of the from and to expressions. The behavior change is that
that the -- forms now do the right thing: they hide all
leading records that satisfy the from-expression, right to the
last record of the range if necessary.
* tests/015/awk-rng.expected: Updated.
* txr.1: Revise semantic description the -- range types, plus
minor fixes.
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* tests/015/awk-rng.tl: More rows of data.
* tests/015/awk-rng.expected: Updated.
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* share/txr/stdlib/awk.tl (sys;awk-mac-let): Provide the
implementation for the local macros --rng, --rng-,
rng+, -rng+ and --rng+.
* tests/015/awk-rng.tl: New file.
* tests/015/awk-rng.expected: New file.
* txr.1: Documented.
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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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