0.047		2016-01-29	T. R. Wyant
  No changes since 0.046_01.

0.046_01	2016-01-22	T. R. Wyant
  Recognize \b{lb}, introduced in 5.23.7. If this is retracted before
    5.24, it will be removed outright.

0.046		2016-01-08	T. R. Wyant
  Add GitHub repository to mmetadata.

0.045		2015-12-31	T. R. Wyant
  No external changes since 0.044_01.

0.044_01	2015-12-23	T. R. Wyant

  Deprecate tokenizer method prior() in favor of
    prior_significant_token(). This is not part of the public interface,
    so I suppose I could have just slam-dunked it, but ...

  Add ability to parse strings as well as regexes
    The new functionality is controlled by the new new() argument
    'parse', whose permitted values are 'regex' (the default), 'string',
    or 'guess'.  String parsing, and the 'string' and 'guess' values of
    'parse', are experimental.

0.044		2015-12-08	T. R. Wyant
  No changes since 0.043_03.

0.043_03	2015-12-01	T. R. Wyant
  Allow nesting of \Q with \U, \L, and \F
    The perlop docs say these nest with each other. Playing with Perl
    suggests that \U, \L and \F supersede each other, but thet they as a
    group nest with \Q in either order, so that if you specify \Q and
    one of the \U, \L, \F group you need two \Es to turn them all back
    off.

0.043_02	2015-11-28	T. R. Wyant
  Restrict recognition of back references in replacement strings to
    \number form, since Perl itself does not recognize \g{...} or
    \k{...} there.

0.043_01	2015-11-25	T. R. Wyant
  Recognize postfix dereference if desired. This is controlled by the
    Boolean argument 'postderef' passed to PPIx::Regexp->new(). The
    default is false, but will become true if postfix dereference
    becomes mainstream Perl 5.
  Add explain() and supporting methods main_structure() and
    in_regex_set(). The explain() method returns a brief explanation of
    what the element does.

0.043		2015-11-18	T. R. Wyant
  No changes since 0.042_05.

0.042_05	2015-11-11	T. R. Wyant
  Do not end regex set prematurely on finding '])'
    The problem is that '])' can occur within an extended bracketed
    character class if it contains grouping parentheses and the last
    item in a group is a regular bracketed character class and there is
    no white space between the end of the character class and the end of
    the group.
  Record parse failure if switch condition is unknown
    The structure was being reblessed to
    PPIx::Regexp::Structure::Unknown, but the number of parse failures
    was not being incremented.

0.042_04	2015-11-10	T. R. Wyant
  Parse \U and friends as meta-characters inside \Q...\E
    This turns out to be what Perl itself does, as shown by
    $ perl -E 'say qr{\Q\Ufoo}'

0.042_03	2015-11-05	T. R. Wyant
  Clear error when lexer identifies unknown token. Those who peruse the
    changes in this release will see that a bunch of refactoring was
    done as part of this.

0.042_02	2015-10-31	T. R. Wyant
  Parse white space inside bracketed character classes inside extended
    bracketed character classes (whew!) as literals, except for the
    space character itself and the horizontal tab. This tracks the
    corresponding change in Perl 5.23.4. This will be reverted if the
    corresponding Perl change does not make it into 5.24.0.

0.042_01	2015-10-29	T. R. Wyant
  Beginning with version 0.035, PPIx::Regexp was incorrectly reporting
    the sense of modifiers when the same token both asserted and negated
    modifiers (e.g. '(?x-i:...)'). This release should correct the
    problem.
  Document policy when Perl changes in such a way that the proper parse
    for a regular expression changes. In this case the more modern parse
    is preferred.

0.042		2015-10-09	T. R. Wyant
  No changes since 0.041_03.

0.041_03	2015-10-01	T. R. Wyant
  Report error rather than failing when parsing a string consisting
    wholly of white space.

0.041_02	2015-09-29	T. R. Wyant
  Group types were not being recognized if they contained the delimiter
    character for the regexp (e.g. in qr<(?\<foo)> the look-behind
    assertion was not recognized as such).
  Correct mis-parse of ' s///'. Leading white space is supposed to be
    acceptable, but the leading whitespace token caused
    PPIx::Regexp::Lexer not to recognize the substitution as such.
  Tokenizer was failing when the string to be parsed was so bad it was
    trying to return the whole thing as a single
    PPIx::Regexp::Token::Unknown.
  PPIx::Regexp::Dumper now displays a message if a structure is missing
    its end delimiter.

0.041_01	2015-09-28	T. R. Wyant
  RT 107331 Produce parse error in the presence of trailing cruft.
    Thanks to Klaus Rindfrey for catching this.
    The tokenizer now does a preliminary scan for delimiting brackets
    and modifiers. Anything after the modifiers except for white space
    is now made into a PPIx::Regexp::Token::Unknown, resulting in a
    parse failure being reported. The previous implementation simply
    assumed a valid expression, and in the case of the expression in the
    ticket blithely mismatched the delimiters and returned a parse
    without failures, but which was manifestly bogus.
  Tweak documentation in PPIx::Regexp.

0.041		2015-07-02	T. R. Wyant
  No changes since 0.041_02.

0.040_02	2015-06-25	T. R. Wyant
  Report \C (match octet) as removed in 5.23.0.

0.040_01	2015-06-20	T. R. Wyant
  Accept non-ASCII whitespace under /x. The Whitespace object can be
    multiple characters; the perl_version_introduced() becomes
    '5.021001' if any of them is a code point above 127.
  The perl_version_removed() method now returns '5.021001' when called
    on a PPIx::Regexp object produced by parsing '?foo?' (match once
    without explicit 'm'). The object produced by parsing 'm?foo?' still
    returns the minimum Perl version.

0.040		2015-05-31	T. R. Wyant
  No changes since 0.039_02.

0.039_02	2015-05-24	T. R. Wyant
  Do not parse unadorned parentheses as capture groups when /n is in
    effect. Instead, they are parsed as PPIx::Regexp::Structure. Named
    captures appear to be unaffected by /n.
  Made a verbose dump a little more so. Specifically, dump
    max_capture_group where relevant, and display dumped values a bit
    more informatively.

0.039_01	2015-05-23	T. R. Wyant
  Report /n (no captures) as having been added in 5.21.8.

0.039		2015-04-02	T. R. Wyant
  No changes since 0.038_01.

0.038_01	2015-03-26	T. R. Wyant
  Recognize nested subscripts in interpolation.
    Thanks to Andy Lester for finding this, which actually manifested in
    Perl-Critic-Policy-Variables-ProhibitUnusedVarsStricter. The problem is
    that the actual heuristics for finding the end of an interpolation are
    undocumented, and I missed this rather-obvious case.
  Add \b{g} (= \b{gcb})

0.038		2015-03-09	T. R. Wyant
  No changes since 0.037_01.

0.037_02	2015-03-01	T. R. Wyant
  Make \b{foo} into an unknown token (and therefore an error. This
    applies to \b{anything}, where 'anything' is anything bur 'gcb',
    'wb', or 'sb'.

0.037_01	2015-02-25	T. R. Wyant
  Handle the boundary assertions introduced in Perl 5.21.9: '\b{gcb}'
    (grapheme cluster boundary), '\b{wb}' (word boundary), '\b{sb}'
    (sentence boundary), and the corresponding '\B{...}' constructions.
    Similar-looking things like '\b{foo}' are not recognized as
    assertions, and end up being literals.  This is less general than I
    usually make things, but was done against the possibility that
    (e.g.) '\b{foo}' might be introduced later, requiring
    perl_version_released() to return a different number. Any of these
    retracted prior to Perl 5.22.0 will simply be removed from
    PPIx::Regexp.

0.037		2014-11-12	T. R. Wyant
  Have PPIx::Regexp::Structure::RegexSet POD recognize that the Perl
    docs (specifically perlrecharclass) now call this construction
    Extended Bracketed Character Classes, not sets.

0.036_01	2014-11-04	T. R. Wyant
  Correctly mark the replacement portion of s///ee as code. Prior to
    this release it was parsed as though no /e were present.
  Make available the number of times a given modifier is asserted
    (except for the match semantics modifiers which get handled
    differently). See PPIx::Regexp::Token::Modifier->asserted() and
    PPIx::Regexp::Tokenizer->modifier() for details.

0.036		2014-01-04	T. R. Wyant
  Retract the "Allow non-ASCII white space under /x" change introduced
    in version 0.033. I misread perl5170delta, and implemented early.
  Change to explicit character class to recognize white space under /x.
    I was previously using \s, which matched too much.
  Thanks to Nobuo Kumagai for finding and reporting this.

0.035		2013-11-15	T. R. Wyant
  Properly handle multi-character modifiers like /ee. We now handle /eie
    as being the same as /eei. Thanks to Anonymous Monk for finding
    this.
  Properly handle \g and \k back references that do not correspond to an
    actual capture group. They are now reblessed into the unknown token,
    and counted as errors. Thanks to Anonymous Monk for finding this.
  Add method error() to PPIx::Regexp::Element. This should return an
    error message when the element is in error -- normally when it has
    been blessed into the unknown token or structure.
  Add method modifier_asserted() to PPIx::Regexp::Element. This walks
    the parse tree backward to determine if the given modifier is in
    effect for the element.

0.034		2013-05-11	T. R. Wyant
  No changes since 0.033_01

0.033_01	2013-05-05	T. R. Wyant
  Correct spelling and grammar errors in POD and comments. RT #85050.
    Thanks David Steinbrunner for catching these.

0.033		2013-02-22	T. R. Wyant
  Allow interpolation in regex sets. It implies Perl 5.17.9 or higher.
  Allow non-ASCII white space under /x. It implies Perl 5.17.9 or
    higher.

0.032		2013-02-06	T. R. Wyant
  Fix problems with Regex Set functionality under Perl 5.6.2. CPAN
    testers RULE!

0.031		2013-01-31	T. R. Wyant
  Have PPIx::Regexp::Token::Code (and offspring) become
    PPIx::Regexp::Token::Unknown inside a regex set.

0.030		2013-01-22	T. R. Wyant
  Add Regex Sets, which were added to Perl as an experimental feature in
    5.17.8. This is experimental in Perl, therefore the parse may
    change.
  Ditch PPIx::Regexp::Token::GroupType method __expect_after_match() in
    favor of the more general __match_setup(). This is done without
    deprecation because __expect_after_match() was documeted as
    package-private, but noted in the change log because it _was_
    documented.

0.029		2013-01-14	T. R. Wyant
  No changes from 0.028_02.

0.028_02	2012-12-31	T. R. Wyant
  Add method unescaped_content() to PPIx::Regexp::Element().
  Rewrite the tokenizing code in PPIx::Regexp::Token::GroupType and
    offspring to use regular expressions specific to the regexp
    delimiter, and escaping only that delimiter. Thanks again to
    Alexandr Ciornii for finding more of these.

0.028_01	2012-12-20	T. R. Wyant
  Fix mis-parse of /(\?|I)/ as a branch reset (it's really an
    alternation). There may be more of these lurking. Thanks to Alexandr
    Ciornii for finding this one.
  Add options -files and -objectify to eg/predump.

0.028		2012-06-06	T. R. Wyant
  Replace all uses of YAML::Any with YAML, since they come in the same
    distro, and YAML does not suffer from deprecation warnings.

0.027		2012-05-28	T. R. Wyant
  Eliminate unescaped literal "{" characters in regexps in
    PPIx::Regexp::Token::Backreference and
    PPIx::Regexp::Token::CharClass::Simple. These are deprecated in 5.17.0.

0.026		2012-02-24	T. R. Wyant
  Add support for \F (fold case), added in 5.15.8.

0.025		2012-01-04	T. R. Wyant
  Tolerate leading and trailing white space around the regular
    expression.  These are still round-trip safe, since the white space
    is tokenized.
  Make Changes file conform to CPAN::Changes, and add
    xt/author/changes.t to ensure continued compliance.

0.024		2011-12-17	T. R. Wyant
  Reinstate author test xt/author/manifest.t, which was clobbered
    shortly before the release of 0.021_10.

0.023		2011-12-08	T. R. Wyant
  Correct address of FSF in the version of the GPL distributed in
    LICENSES/Copying. Thanks to Petr Pisar for picking this up.

0.022		2011-11-24	T. R. Wyant
  Correct various documentation errors.
  The default-modifier functionality is no longer considered
    experimental.
  No code changes since 0.021_11.

0.021_11	2011-11-15	T. R. Wyant
  Don't initialize effective modifiers with '^', since that wrongly
    asserts that /d has been seen somewhere along the line.
  Implement negation of match-semantic modifiers (e.g. 'no re /u;') by
    setting the relevant datum to undef.
  THE DEFAULT-MODIFIER FUNCTIONALITY IS EXPERIMENTAL, AND MAY BE CHANGED
    WITHOUT NOTICE until the next production release.

0.021_10	2011-11-14	T. R. Wyant
  Support for default modifiers. This includes:
    * default_modifiers argument to new() in PPIx::Regexp,
      PPIx::Regexp::Tokenizer, and PPIx::Regexp::Dumper
    * Public method modifier_asserted() on PPIx::Regexp, to return
      whether a given modifier is actually in effect. The results of the
      modifier() method are unchanged.
    THIS FUNCTIONALITY IS EXPERIMENTAL, AND MAY BE CHANGED OR REVOKED
    WITHOUT WARNING.
  Require Test::More 0.88 for installation. Eliminate all the 'eval
    { require ... }' logic in favor of 'use Test::More 0.88'.
  Have Makefile.PL make use of {BUILD_REQUIRES} if it is available.
  Fix PPIx::Regexp::Token::Whitespace->can_be_quantified() to return
    false.

0.021		2011-07-22	T. R. Wyant
  Modified tokenizer to correctly handle a back slash used as a
    delimiter. I believe.
  PPIx::Regexp::Dumper now dumps the results of ppi() if that method is
    present and -verbose is asserted.

0.020		2011-04-02	T. R. Wyant
  Corrected perl_version_introduced():
    \R is now 5.009005 (was 5.000).

0.019		2011-03-01	T. R. Wyant
  Various corrections to perl_version_introduced():
    \X is now 5.006 (was 5.000);
    \N{name} is now 5.006001 (was 5.006);
    \N{U+xxxx} is now 5.008 (was 5.006).
  The \C is now parsed as a PPIx::Regexp::Token::CharClass::Simple. It
    was previously considered a PPIx::Regexp::Token::Literal.
  Ensure that \N{$foo} parses as a Unicode literal, not a quantified \N.
    The ordinal() method returns undef for this.
  Understand the /aa modifier, introduced with 5.13.10.
  Report perl_version_introduced() of 5.013010 for the new semantic
    modifiers when modifying the entire expression.
  Correct handling of interpolations like ${^foo} and $#{foo}.

0.018		2011-02-16	T. R. Wyant
  No changes (other than version) since 0.017_02.

0.017_02	2011-01-31	T. R. Wyant
  Override ppi() in PPIx::Regexp::Token::Interpolation to provide the
    proper PPI when variable names are bracketed.
  Properly parse bracketed variable names (I hope!), which may not be
    subscripted.

0.017_01	2011-01-28	T. R. Wyant
  Take account of possible '$' or '@' casts before a symbol in an
    interpolation (e.g. $$foo{bar}, which is equivalent to $foo->{bar}).

0.017		2011-01-26	T. R. Wyant
  Add the /a modifier to PPI::Regexp::Token::Modifiers, legal only in
    the (?:...) construction. This was introduced in Perl 5.13.9.
  When parsing an interpolation from a replacement string (rather than a
    regular expression), take subscripts at face value rather than
    trying to disambiguate them from quantifiers and character classes,
    which they can't be in this context.

0.016		2011-01-05	T. R. Wyant
  The PPIx::Regexp::Token::Code perl_version_introduced() method now
    returns the minimum Perl version (currently set to 5.000) if it is
    used to represent the substitution portion of s///e.
  Update copyright to 2011.

0.015		2010-10-25	T. R. Wyant
  Documented intent to revoke support for features introduced in a
    development Perl which do not make it to a production release. This
    is necessary because in this case the syntax could be reused with
    different semantics.
  Added support for Perl 5.13.6 (?^...) construction.
  Added support for Perl 5.13.6 d, l, and u modifiers.
  Fixed inconsistency in perl_version_introduced() results between
    PPIx::Regexp::Token::Modifier and
    PPIx::Regexp::Token::GroupType::Modifier.
  Corrected PPIx::Regexp::Constant RE_CAPTURE_NAME docs, somehow missed
    back at 0.010_01.

0.014		2010-10-14	T. R. Wyant
  Recognize \o{...} as a PPIx::Regexp::Token::Literal, with
    perl_version_introduced() of 5.0013003.
  Terminate \0.. through \7.. after three characters, as Perl does.
    These two were brought to my attention by Brian D.  Foy's "The
    Effective Perler" for October 11 2010,
    http://www.effectiveperlprogramming.com/blog/697
  Correct the PPIx::Regexp::Token::Literal ordinal() method for '\b'. As
    a literal, this is a back space.

0.013		2010-10-10	T. R. Wyant
  Declare a parse failure if characters are found between the '}' and
    the ')' of (?{...}) and (??{...}), and rebless the tokens to
    ::Unknown. Perl does not accept anything here, so I think I should
    not either.
  Whitespace tweak in the PPIx::Regexp::Dumper test output for the
    failures test.
  Replace the PPI logic in PPIx::Regexp::Token::Code with a call to
    $tokenizer->find_matching_delimiter(). This is actually the way Perl
    works, as a look at toke.c and regcomp.c makes clear.
  Push the perl_version_introduced() back to 5.0 at the request of
    Alexandr Ciornii, for the potential benefit of Perl::MinimumVersion.
    This was done mostly by reading the various perlre, perldelta, and
    perlop documents, so these should be taken with a HUGE grain of
    salt.

0.012		2010-09-26	T. R. Wyant
  Track all the features reported as introduced (or removed) in Perl
    5.010 back to Perl 5.009005, and report them as such.
  Report modifier /r as having been introduced in Perl 5.013002, rather
    than the default of 5.006.

0.011		2010-09-16	T. R. Wyant
  No changes from 0.010_01.

0.010_01	2010-09-11	T. R. Wyant
  Remove dependencies on Params::Util and Readonly. The latter was
    requested by ADAMK for the benefit of Padre. It involved changing
    the symbols exported from PPIx::Regexp::Constant, but these were
    documented as private, so ...
  Parse POSIX character classes [=a=] and [.a.] as
    PPIx::Regexp::Token::CharClass::POSIX::Unknown, which counts as a
    parse failure since these are not supported by Perl.
  Make the PPI::Document created by PPIx::Regexp::Token::Code->ppi() be
    read only. This means we need PPI 1.116. Cache the document, and
    ensure the cached result is returned on subsequent calls.

0.010		2010-08-06	T. R. Wyant
  Fix fatal error in PPIx::Regexp::Token::Code->ppi().
  Move author tests from xt/ to xt/author/.

0.009		2010-08-03	T. R. Wyant
  Recognize s/.../.../ee as being different from s/.../.../e. In
    particular, the replacement portion of the former is _not_ a Perl
    expression: it's an interpolatble string, which later gets
    eval{}'ed.

0.008		2010-07-01	T. R. Wyant
  Promote methods can_be_quantified() and is_quantifier() from
    PPIx::Regexp::Token to PPIx::Regexp::Element, so all classes inherit
    them. They still return true and false respectively.
  Override can_be_quantified() to return false on PPIx::Regexp,
    PPIx::Regexp::Structure::Quantifier,
    PPIx::Regexp::Structure::Regexp, and
    PPIx::Regexp::Structure::Replacement.
  Override is_quantifier() to return true on
    PPIx::Regexp::Structure::Quantifier.
  Modify PPIx::Regexp::Dumper to be able to display can_be_quantified
    and is_quantifier for PPIx::Regexp::Node objects when dumping
    verbosely.
  Convert internal data to Readonly in PPIx::Regexp::Lexer,
    PPIx::Regexp::Token::CharClass::Simple,
    PPIx::Regexp::Token::Structure, and PPIx::Regexp::Tokenizer.
  Remove leftover boilerplate in PPIx::Regexp::Token::CharClass::Simple.

0.007_01	2010-06-28	T. R. Wyant
  Explicitly require a minimum Perl of 5.006.
  Centralized dependencies in inc/PPIx/Regexp/Meta.pm.
  Removed claim that PPIx::Regexp is alpha code. Docs still say that the
    interface can be changed, but now it will go through a deprecation
    cycle.

0.007		2010-04-28	T. R. Wyant
  PPIx::Regexp::Lexer no longer fails when encountering expressions like
    m{)}. Instead, it marks the right parenthesis as an unmatched
    delimiter.

0.006_01	2010-04-23	T. R. Wyant
  Fixed RT 56864 - PPIx::Regexp::Lexer fails in Perl::Critic under Perl
    5.13.0. This was due to the value of a returned $+[0] getting
    transmogrified before the caller saw it. I never did isolate what
    triggered the bug.
  You can now get a tokenizer trace by setting environment value
    PPIX_REGEXP_TOKENIZER_TRACE to a non-zero numeric value. This is
    unsupported, though.

0.006		2010-02-26	T. R. Wyant
  Update copyright from 2009 to 2009-2010.
  Parse \N{...} in accordance with perl5115delta. The curlys must
    contain an alpha followed by alphanumerics, spaces, parens, colons,
    or dashes. \N{ without a matching } is a character class (if legal)
    followed by a literal '{'.
  Parse \N inside a character class as PPI::Regexp::Token::Unknown,
    since Perl 5.11.5 considers this a compile error. A \N{...} inside a
    character class is still OK.
  Add method match() to PPIx::Regexp::Tokenizer. This is analogous to
    capture(), but returns the entire matched string.

0.005		2009-12-26	T. R. Wyant
  Recognize \N (without curlys), back-ported from Perl 6 into 5.11.
  Recognize unicode characters as \N{[[:alpha:]] ... rather than
    \N{[\w\s:] ... This is per the 5.11 documentation, but I think Perl
    always worked this way.
  Recognize loose matching of Unicode character classes, and allow '='
    in lieu of a single ':' in a Unicode character class (this from Perl
    5.11.3).
  PPIx::Regexp::Dumper now produces the proper output when called with
    perl_version => 1, test => 1.
  Describe the typical content of the object in the documentation for
    PPIx::Regexp::Structure::NamedCapture and
    PPIx::Regexp::Token::GroupType::NamedCapture.

0.004		2009-11-09	T. R. Wyant
  Have PPIx::Regexp::Token::Literal correctly recognize when
    charnames::vianame() is unavailable, and decouple this from the
    handling of \N{U+hhhh}.
  Add dependency on Task::Weaken, since depending on Scalar::Util
    appears not to cut it.
  Correct the assignment of the license type in Makefile.PL.

0.003		2009-11-05	T. R. Wyant
  Have PPIx::Regexp::Token::Literal recognize \N{U+hhhh} (where hhhh
    represents hex digits), and provide its ordinal (hhhh). Remove
    recognition of \N. (. = any character), which Perl does not do.
  Fix $re->flush_cache() so that it actually removes $re and only
    $re from the cache.
  Add delimiters() method to PPIx::Regexp::Main and PPIx::Regexp.
    Support this in eg/prenav.
  Increase test coverage and remove dead code.
  Count tests in t/parse.t and t/unit.t

0.002		2009-10-28	T. R. Wyant
  In verbose mode, have PPIx::Regexp::Dumper dump the absolute capture
    number referred to by a numbered reference.
  Have eg/preslurp pass its -verbose option to PPIx::Regexp::Dumper
  Don't use Test::More::isa_ok for the t/basic.t class heritage tests,
    since some versions of Test::More require a reference for the first
    argument of isa_ok().

0.001		2009-10-21	T. R. Wyant
  Initial release.

# ex: set textwidth=72 autoindent :
