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Revised description of regex operators. Added section
on intersection and complement, which may not be familiar
to regex users.
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This turns out to be easy to do in NFA land.
The complement of an NFA has exactly the same number
and configuration of states and transitions, except
that the states have an inverted meaning; and furthermore,
failed character transitions are routed to an extra
state (which in this impelmentation is permanently
allocated and shared by all regexes). The regex &
is implemented trivially using DeMorgan's.
Also, bugfix: regular expressions like A|B|C are allowed
now by the syntax, rather than constituting syntax error.
Previously, this would have been entered as (A|B)|C.
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a system package instead of being hacked with the $ prefix.
Keyword symbols are provided. In the matcher, evaluation
is tightened up. Keywords, nil and t are not bindeable, and
errors are thrown if attempts are made to bind them.
Destructuring in dest_bind is strict in the number of items.
String streams are exploited to print bindings to objects
that are not strings or characters. Numerous bugfixes.
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Bumped version numbers, and cleaned up trailing whitespace from some files.
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Test suite exercises -c now.
txr.c (txr_main): If the script specified with -c is not terminated
by a newline, just add a newline. On the shell command line, it's a
nuisance to have to add the extra line before closing the quote.
It's also awkward in scripting, because the shell (or at
least Bash 3.0) does not produce a final terminating newline in command
substitution syntax like -c "$(cat file)". The last newline in
the file is trimmed, and has to be explicitly added in the script
itself, which is wrong in the case when the file is empty.
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Cleaned up some more issues related to extended characters.
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Added Introduction headings to some major sections.
Improved exception handling intro.
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Regexps can be bound to variables.
New freeform directive.
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and used for matching. This Just Works because of
the way match_line treats variables.
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Note: Version 016 ChangeLog message incorrect.
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