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    arguments:
    root - the canonical root of the tree you're matching against
    cwd - the current working directory, if relevant
    patterns - patterns to find
    include - patterns to include (unless they are excluded)
    exclude - patterns to exclude (even if they are included)
    default - if a pattern in patterns has no explicit type, assume this one
    auditor - optional path auditor
    ctx - optional changecontext
    listsubrepos - if True, recurse into subrepositories
    warn - optional function used for printing warnings
    badfn - optional bad() callback for this matcher instead of the default
    icasefs - make a matcher for wdir on case insensitive filesystems, which
        normalizes the given patterns to the case in the filesystem

    a pattern is one of:
    'glob:<glob>' - a glob relative to cwd
    're:<regexp>' - a regular expression
    'path:<path>' - a path relative to repository root, which is matched
                    recursively
    'rootfilesin:<path>' - a path relative to repository root, which is
                    matched non-recursively (will not match subdirectories)
    'relglob:<glob>' - an unrooted glob (*.c matches C files in all dirs)
    'relpath:<path>' - a path relative to cwd
    'relre:<regexp>' - a regexp that needn't match the start of a name
    'set:<fileset>' - a fileset expression
    'include:<path>' - a file of patterns to read and include
    'subinclude:<path>' - a file of patterns to match against files under
                          the same directory
    '<something>' - a pattern of the specified default type

    >>> def _match(root, *args, **kwargs):
    ...     return match(util.localpath(root), *args, **kwargs)

    Usually a patternmatcher is returned:
    >>> _match(b'/foo', b'.', [b're:.*\.c$', b'path:foo/a', b'*.py'])
    <patternmatcher patterns='.*\\.c$|foo/a(?:/|$)|[^/]*\\.py$'>

    Combining 'patterns' with 'include' (resp. 'exclude') gives an
    intersectionmatcher (resp. a differencematcher):
    >>> type(_match(b'/foo', b'.', [b're:.*\.c$'], include=[b'path:lib']))
    <class 'mercurial.match.intersectionmatcher'>
    >>> type(_match(b'/foo', b'.', [b're:.*\.c$'], exclude=[b'path:build']))
    <class 'mercurial.match.differencematcher'>

    Notice that, if 'patterns' is empty, an alwaysmatcher is returned:
    >>> _match(b'/foo', b'.', [])
    <alwaysmatcher>

    The 'default' argument determines which kind of pattern is assumed if a
    pattern has no prefix:
    >>> _match(b'/foo', b'.', [b'.*\.c$'], default=b're')
    <patternmatcher patterns='.*\\.c$'>
    >>> _match(b'/foo', b'.', [b'main.py'], default=b'relpath')
    <patternmatcher patterns='main\\.py(?:/|$)'>
    >>> _match(b'/foo', b'.', [b'main.py'], default=b're')
    <patternmatcher patterns='main.py'>

    The primary use of matchers is to check whether a value (usually a file
    name) matches againset one of the patterns given at initialization. There
    are two ways of doing this check.

    >>> m = _match(b'/foo', b'', [b're:.*\.c$', b'relpath:a'])

    1. Calling the matcher with a file name returns True if any pattern
    matches that file name:
    >>> m(b'a')
    True
    >>> m(b'main.c')
    True
    >>> m(b'test.py')
    False

    2. Using the exact() method only returns True if the file name matches one
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        patterns.

        This function is very similar to 'visitdir', and the following mapping
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             visitdir | visitchildrenlist
            ----------+-------------------
             False    | set()
             'all'    | 'all'
             True     | 'this' OR non-empty set of subdirs -or files- to visit

        Example:
          Assume matchers ['path:foo/bar', 'rootfilesin:qux'], we would return
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          '' -> {'foo', 'qux'}
          'baz' -> set()
          'foo' -> {'bar'}
          # Ideally this would be 'all', but since the prefix nature of matchers
          # is applied to the entire matcher, we have to downgrade this to
          # 'this' due to the non-prefix 'rootfilesin'-kind matcher being mixed
          # in.
          'foo/bar' -> 'this'
          'qux' -> 'this'

        Important:
          Most matchers do not know if they're representing files or
          directories. They see ['path:dir/f'] and don't know whether 'f' is a
          file or a directory, so visitchildrenset('dir') for most matchers will
          return {'f'}, but if the matcher knows it's a file (like exactmatcher
          does), it may return 'this'. Do not rely on the return being a set
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    ...     (b'path', b'foo/a', b''),
    ...     (b'relpath', b'b', b''),
    ...     (b'glob', b'*.h', b''),
    ... ]
    >>> m = patternmatcher(b'foo', kindpats)
    >>> m(b'main.c')  # matches re:.*\.c$
    True
    >>> m(b'b.txt')
    False
    >>> m(b'foo/a')  # matches path:foo/a
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    >>> m(b'a')  # does not match path:b, since 'root' is 'foo'
    False
    >>> m(b'b')  # matches relpath:b, since 'root' is 'foo'
    True
    >>> m(b'lib.h')  # matches glob:*.h
    True

    >>> m.files()
    ['', 'foo/a', 'b', '']
    >>> m.exact(b'foo/a')
    True
    >>> m.exact(b'b')
    True
    >>> m.exact(b'lib.h')  # exact matches are for (rel)path kinds
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    True
    >>> m(b'b.txt')
    False

    Input files that would be matched are exactly those returned by .files()
    >>> m.files()
    ['a.txt', 're:.*\\.c$']

    So pattern 're:.*\.c$' is not considered as a regex, but as a file name
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