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author | Andrew M. Kuchling <amk@amk.ca> | 2004-06-02 17:40:14 (GMT) |
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committer | Andrew M. Kuchling <amk@amk.ca> | 2004-06-02 17:40:14 (GMT) |
commit | 4ad9723ed81ef8ff5b943df3cd7cd10323023200 (patch) | |
tree | 41410b40c3a83acc8227776d5dda70de4e9d5c9f /Lib | |
parent | 5629d0e616675b21b8dd92ebc40ab14edeccc014 (diff) | |
download | cpython-4ad9723ed81ef8ff5b943df3cd7cd10323023200.zip cpython-4ad9723ed81ef8ff5b943df3cd7cd10323023200.tar.gz cpython-4ad9723ed81ef8ff5b943df3cd7cd10323023200.tar.bz2 |
Remove pre module
Diffstat (limited to 'Lib')
-rw-r--r-- | Lib/pre.py | 662 | ||||
-rw-r--r-- | Lib/test/test_sundry.py | 3 |
2 files changed, 0 insertions, 665 deletions
diff --git a/Lib/pre.py b/Lib/pre.py deleted file mode 100644 index 60db913..0000000 --- a/Lib/pre.py +++ /dev/null @@ -1,662 +0,0 @@ -# module 're' -- A collection of regular expression operations - -r"""Support for regular expressions (RE). - -This module provides regular expression matching operations similar to -those found in Perl. It's 8-bit clean: the strings being processed may -contain both null bytes and characters whose high bit is set. Regular -expression pattern strings may not contain null bytes, but can specify -the null byte using the \\number notation. Characters with the high -bit set may be included. - -Regular expressions can contain both special and ordinary -characters. Most ordinary characters, like "A", "a", or "0", are the -simplest regular expressions; they simply match themselves. You can -concatenate ordinary characters, so last matches the string 'last'. - -The special characters are: - "." Matches any character except a newline. - "^" Matches the start of the string. - "$" Matches the end of the string. - "*" Matches 0 or more (greedy) repetitions of the preceding RE. - Greedy means that it will match as many repetitions as possible. - "+" Matches 1 or more (greedy) repetitions of the preceding RE. - "?" Matches 0 or 1 (greedy) of the preceding RE. - *?,+?,?? Non-greedy versions of the previous three special characters. - {m,n} Matches from m to n repetitions of the preceding RE. - {m,n}? Non-greedy version of the above. - "\\" Either escapes special characters or signals a special sequence. - [] Indicates a set of characters. - A "^" as the first character indicates a complementing set. - "|" A|B, creates an RE that will match either A or B. - (...) Matches the RE inside the parentheses. - The contents can be retrieved or matched later in the string. - (?iLmsx) Set the I, L, M, S, or X flag for the RE. - (?:...) Non-grouping version of regular parentheses. - (?P<name>...) The substring matched by the group is accessible by name. - (?P=name) Matches the text matched earlier by the group named name. - (?#...) A comment; ignored. - (?=...) Matches if ... matches next, but doesn't consume the string. - (?!...) Matches if ... doesn't match next. - -The special sequences consist of "\\" and a character from the list -below. If the ordinary character is not on the list, then the -resulting RE will match the second character. - \\number Matches the contents of the group of the same number. - \\A Matches only at the start of the string. - \\Z Matches only at the end of the string. - \\b Matches the empty string, but only at the start or end of a word. - \\B Matches the empty string, but not at the start or end of a word. - \\d Matches any decimal digit; equivalent to the set [0-9]. - \\D Matches any non-digit character; equivalent to the set [^0-9]. - \\s Matches any whitespace character; equivalent to [ \\t\\n\\r\\f\\v]. - \\S Matches any non-whitespace character; equiv. to [^ \\t\\n\\r\\f\\v]. - \\w Matches any alphanumeric character; equivalent to [a-zA-Z0-9_]. - With LOCALE, it will match the set [0-9_] plus characters defined - as letters for the current locale. - \\W Matches the complement of \\w. - \\\\ Matches a literal backslash. - -This module exports the following functions: - match Match a regular expression pattern to the beginning of a string. - search Search a string for the presence of a pattern. - sub Substitute occurrences of a pattern found in a string. - subn Same as sub, but also return the number of substitutions made. - split Split a string by the occurrences of a pattern. - findall Find all occurrences of a pattern in a string. - compile Compile a pattern into a RegexObject. - escape Backslash all non-alphanumerics in a string. - -This module exports the following classes: - RegexObject Holds a compiled regular expression pattern. - MatchObject Contains information about pattern matches. - -Some of the functions in this module takes flags as optional parameters: - I IGNORECASE Perform case-insensitive matching. - L LOCALE Make \w, \W, \b, \B, dependent on the current locale. - M MULTILINE "^" matches the beginning of lines as well as the string. - "$" matches the end of lines as well as the string. - S DOTALL "." matches any character at all, including the newline. - X VERBOSE Ignore whitespace and comments for nicer looking RE's. - -This module also defines an exception 'error'. - -""" - - -import sys -from pcre import * - -# XXX This module is deprecated as of Python 2.3, and should be removed -# in the version that follows 2.3. -import warnings as _warnings -_warnings.warn("Please use the 're' module, not the 'pre' module", - DeprecationWarning) - -__all__ = ["match","search","sub","subn","split","findall","escape","compile", - "I","L","M","S","X","IGNORECASE","LOCALE","MULTILINE","DOTALL", - "VERBOSE","error"] - -# -# First, the public part of the interface: -# - -# pcre.error and re.error should be the same, since exceptions can be -# raised from either module. - -# compilation flags - -I = IGNORECASE -L = LOCALE -M = MULTILINE -S = DOTALL -X = VERBOSE - - -# -# -# - -_cache = {} -_MAXCACHE = 20 - -def _cachecompile(pattern, flags=0): - key = (pattern, flags) - try: - return _cache[key] - except KeyError: - pass - value = compile(pattern, flags) - if len(_cache) >= _MAXCACHE: - _cache.clear() - _cache[key] = value - return value - -def match(pattern, string, flags=0): - """match (pattern, string[, flags]) -> MatchObject or None - - If zero or more characters at the beginning of string match the - regular expression pattern, return a corresponding MatchObject - instance. Return None if the string does not match the pattern; - note that this is different from a zero-length match. - - Note: If you want to locate a match anywhere in string, use - search() instead. - - """ - - return _cachecompile(pattern, flags).match(string) - -def search(pattern, string, flags=0): - """search (pattern, string[, flags]) -> MatchObject or None - - Scan through string looking for a location where the regular - expression pattern produces a match, and return a corresponding - MatchObject instance. Return None if no position in the string - matches the pattern; note that this is different from finding a - zero-length match at some point in the string. - - """ - return _cachecompile(pattern, flags).search(string) - -def sub(pattern, repl, string, count=0): - """sub(pattern, repl, string[, count=0]) -> string - - Return the string obtained by replacing the leftmost - non-overlapping occurrences of pattern in string by the - replacement repl. If the pattern isn't found, string is returned - unchanged. repl can be a string or a function; if a function, it - is called for every non-overlapping occurrence of pattern. The - function takes a single match object argument, and returns the - replacement string. - - The pattern may be a string or a regex object; if you need to - specify regular expression flags, you must use a regex object, or - use embedded modifiers in a pattern; e.g. - sub("(?i)b+", "x", "bbbb BBBB") returns 'x x'. - - The optional argument count is the maximum number of pattern - occurrences to be replaced; count must be a non-negative integer, - and the default value of 0 means to replace all occurrences. - - """ - if type(pattern) == type(''): - pattern = _cachecompile(pattern) - return pattern.sub(repl, string, count) - -def subn(pattern, repl, string, count=0): - """subn(pattern, repl, string[, count=0]) -> (string, num substitutions) - - Perform the same operation as sub(), but return a tuple - (new_string, number_of_subs_made). - - """ - if type(pattern) == type(''): - pattern = _cachecompile(pattern) - return pattern.subn(repl, string, count) - -def split(pattern, string, maxsplit=0): - """split(pattern, string[, maxsplit=0]) -> list of strings - - Split string by the occurrences of pattern. If capturing - parentheses are used in pattern, then the text of all groups in - the pattern are also returned as part of the resulting list. If - maxsplit is nonzero, at most maxsplit splits occur, and the - remainder of the string is returned as the final element of the - list. - - """ - if type(pattern) == type(''): - pattern = _cachecompile(pattern) - return pattern.split(string, maxsplit) - -def findall(pattern, string): - """findall(pattern, string) -> list - - Return a list of all non-overlapping matches of pattern in - string. If one or more groups are present in the pattern, return a - list of groups; this will be a list of tuples if the pattern has - more than one group. Empty matches are included in the result. - - """ - if type(pattern) == type(''): - pattern = _cachecompile(pattern) - return pattern.findall(string) - -def escape(pattern): - """escape(string) -> string - - Return string with all non-alphanumerics backslashed; this is - useful if you want to match an arbitrary literal string that may - have regular expression metacharacters in it. - - """ - result = list(pattern) - for i in range(len(pattern)): - char = pattern[i] - if not char.isalnum(): - if char=='\000': result[i] = '\\000' - else: result[i] = '\\'+char - return ''.join(result) - -def compile(pattern, flags=0): - """compile(pattern[, flags]) -> RegexObject - - Compile a regular expression pattern into a regular expression - object, which can be used for matching using its match() and - search() methods. - - """ - groupindex={} - code=pcre_compile(pattern, flags, groupindex) - return RegexObject(pattern, flags, code, groupindex) - - -# -# Class definitions -# - -class RegexObject: - """Holds a compiled regular expression pattern. - - Methods: - match Match the pattern to the beginning of a string. - search Search a string for the presence of the pattern. - sub Substitute occurrences of the pattern found in a string. - subn Same as sub, but also return the number of substitutions made. - split Split a string by the occurrences of the pattern. - findall Find all occurrences of the pattern in a string. - - """ - - def __init__(self, pattern, flags, code, groupindex): - self.code = code - self.flags = flags - self.pattern = pattern - self.groupindex = groupindex - - def search(self, string, pos=0, endpos=None): - """search(string[, pos][, endpos]) -> MatchObject or None - - Scan through string looking for a location where this regular - expression produces a match, and return a corresponding - MatchObject instance. Return None if no position in the string - matches the pattern; note that this is different from finding - a zero-length match at some point in the string. The optional - pos and endpos parameters have the same meaning as for the - match() method. - - """ - if endpos is None or endpos>len(string): - endpos=len(string) - if endpos<pos: endpos=pos - regs = self.code.match(string, pos, endpos, 0) - if regs is None: - return None - self._num_regs=len(regs) - - return MatchObject(self, - string, - pos, endpos, - regs) - - def match(self, string, pos=0, endpos=None): - """match(string[, pos][, endpos]) -> MatchObject or None - - If zero or more characters at the beginning of string match - this regular expression, return a corresponding MatchObject - instance. Return None if the string does not match the - pattern; note that this is different from a zero-length match. - - Note: If you want to locate a match anywhere in string, use - search() instead. - - The optional second parameter pos gives an index in the string - where the search is to start; it defaults to 0. This is not - completely equivalent to slicing the string; the '' pattern - character matches at the real beginning of the string and at - positions just after a newline, but not necessarily at the - index where the search is to start. - - The optional parameter endpos limits how far the string will - be searched; it will be as if the string is endpos characters - long, so only the characters from pos to endpos will be - searched for a match. - - """ - if endpos is None or endpos>len(string): - endpos=len(string) - if endpos<pos: endpos=pos - regs = self.code.match(string, pos, endpos, ANCHORED) - if regs is None: - return None - self._num_regs=len(regs) - return MatchObject(self, - string, - pos, endpos, - regs) - - def sub(self, repl, string, count=0): - """sub(repl, string[, count=0]) -> string - - Return the string obtained by replacing the leftmost - non-overlapping occurrences of the compiled pattern in string - by the replacement repl. If the pattern isn't found, string is - returned unchanged. - - Identical to the sub() function, using the compiled pattern. - - """ - return self.subn(repl, string, count)[0] - - def subn(self, repl, source, count=0): - """subn(repl, string[, count=0]) -> tuple - - Perform the same operation as sub(), but return a tuple - (new_string, number_of_subs_made). - - """ - if count < 0: - raise error, "negative substitution count" - if count == 0: - count = sys.maxint - n = 0 # Number of matches - pos = 0 # Where to start searching - lastmatch = -1 # End of last match - results = [] # Substrings making up the result - end = len(source) - - if type(repl) is type(''): - # See if repl contains group references (if it does, - # pcre_expand will attempt to call _Dummy.group, which - # results in a TypeError) - try: - repl = pcre_expand(_Dummy, repl) - except (error, TypeError): - m = MatchObject(self, source, 0, end, []) - repl = lambda m, repl=repl, expand=pcre_expand: expand(m, repl) - else: - m = None - else: - m = MatchObject(self, source, 0, end, []) - - match = self.code.match - append = results.append - while n < count and pos <= end: - regs = match(source, pos, end, 0) - if not regs: - break - self._num_regs = len(regs) - i, j = regs[0] - if i == j == lastmatch: - # Empty match adjacent to previous match - pos = pos + 1 - append(source[lastmatch:pos]) - continue - if pos < i: - append(source[pos:i]) - if m: - m.pos = pos - m.regs = regs - append(repl(m)) - else: - append(repl) - pos = lastmatch = j - if i == j: - # Last match was empty; don't try here again - pos = pos + 1 - append(source[lastmatch:pos]) - n = n + 1 - append(source[pos:]) - return (''.join(results), n) - - def split(self, source, maxsplit=0): - """split(source[, maxsplit=0]) -> list of strings - - Split string by the occurrences of the compiled pattern. If - capturing parentheses are used in the pattern, then the text - of all groups in the pattern are also returned as part of the - resulting list. If maxsplit is nonzero, at most maxsplit - splits occur, and the remainder of the string is returned as - the final element of the list. - - """ - if maxsplit < 0: - raise error, "negative split count" - if maxsplit == 0: - maxsplit = sys.maxint - n = 0 - pos = 0 - lastmatch = 0 - results = [] - end = len(source) - match = self.code.match - append = results.append - while n < maxsplit: - regs = match(source, pos, end, 0) - if not regs: - break - i, j = regs[0] - if i == j: - # Empty match - if pos >= end: - break - pos = pos+1 - continue - append(source[lastmatch:i]) - rest = regs[1:] - if rest: - for a, b in rest: - if a == -1 or b == -1: - group = None - else: - group = source[a:b] - append(group) - pos = lastmatch = j - n = n + 1 - append(source[lastmatch:]) - return results - - def findall(self, source): - """findall(source) -> list - - Return a list of all non-overlapping matches of the compiled - pattern in string. If one or more groups are present in the - pattern, return a list of groups; this will be a list of - tuples if the pattern has more than one group. Empty matches - are included in the result. - - """ - pos = 0 - end = len(source) - results = [] - match = self.code.match - append = results.append - while pos <= end: - regs = match(source, pos, end, 0) - if not regs: - break - i, j = regs[0] - rest = regs[1:] - if not rest: - gr = source[i:j] - elif len(rest) == 1: - a, b = rest[0] - gr = source[a:b] - else: - gr = [] - for (a, b) in rest: - gr.append(source[a:b]) - gr = tuple(gr) - append(gr) - pos = max(j, pos+1) - return results - - # The following 3 functions were contributed by Mike Fletcher, and - # allow pickling and unpickling of RegexObject instances. - def __getinitargs__(self): - return (None,None,None,None) # any 4 elements, to work around - # problems with the - # pickle/cPickle modules not yet - # ignoring the __init__ function - def __getstate__(self): - return self.pattern, self.flags, self.groupindex - def __setstate__(self, statetuple): - self.pattern = statetuple[0] - self.flags = statetuple[1] - self.groupindex = statetuple[2] - self.code = pcre_compile(*statetuple) - -class _Dummy: - # Dummy class used by _subn_string(). Has 'group' to avoid core dump. - group = None - -class MatchObject: - """Holds a compiled regular expression pattern. - - Methods: - start Return the index of the start of a matched substring. - end Return the index of the end of a matched substring. - span Return a tuple of (start, end) of a matched substring. - groups Return a tuple of all the subgroups of the match. - group Return one or more subgroups of the match. - groupdict Return a dictionary of all the named subgroups of the match. - - """ - - def __init__(self, re, string, pos, endpos, regs): - self.re = re - self.string = string - self.pos = pos - self.endpos = endpos - self.regs = regs - - def start(self, g = 0): - """start([group=0]) -> int or None - - Return the index of the start of the substring matched by - group; group defaults to zero (meaning the whole matched - substring). Return -1 if group exists but did not contribute - to the match. - - """ - if type(g) == type(''): - try: - g = self.re.groupindex[g] - except (KeyError, TypeError): - raise IndexError, 'group %r is undefined' % (g,) - return self.regs[g][0] - - def end(self, g = 0): - """end([group=0]) -> int or None - - Return the indices of the end of the substring matched by - group; group defaults to zero (meaning the whole matched - substring). Return -1 if group exists but did not contribute - to the match. - - """ - if type(g) == type(''): - try: - g = self.re.groupindex[g] - except (KeyError, TypeError): - raise IndexError, 'group %r is undefined' % (g,) - return self.regs[g][1] - - def span(self, g = 0): - """span([group=0]) -> tuple - - Return the 2-tuple (m.start(group), m.end(group)). Note that - if group did not contribute to the match, this is (-1, - -1). Group defaults to zero (meaning the whole matched - substring). - - """ - if type(g) == type(''): - try: - g = self.re.groupindex[g] - except (KeyError, TypeError): - raise IndexError, 'group %r is undefined' % (g,) - return self.regs[g] - - def groups(self, default=None): - """groups([default=None]) -> tuple - - Return a tuple containing all the subgroups of the match, from - 1 up to however many groups are in the pattern. The default - argument is used for groups that did not participate in the - match. - - """ - result = [] - for g in range(1, self.re._num_regs): - a, b = self.regs[g] - if a == -1 or b == -1: - result.append(default) - else: - result.append(self.string[a:b]) - return tuple(result) - - def group(self, *groups): - """group([group1, group2, ...]) -> string or tuple - - Return one or more subgroups of the match. If there is a - single argument, the result is a single string; if there are - multiple arguments, the result is a tuple with one item per - argument. Without arguments, group1 defaults to zero (i.e. the - whole match is returned). If a groupN argument is zero, the - corresponding return value is the entire matching string; if - it is in the inclusive range [1..99], it is the string - matching the corresponding parenthesized group. If a group - number is negative or larger than the number of groups defined - in the pattern, an IndexError exception is raised. If a group - is contained in a part of the pattern that did not match, the - corresponding result is None. If a group is contained in a - part of the pattern that matched multiple times, the last - match is returned. - - If the regular expression uses the (?P<name>...) syntax, the - groupN arguments may also be strings identifying groups by - their group name. If a string argument is not used as a group - name in the pattern, an IndexError exception is raised. - - """ - if len(groups) == 0: - groups = (0,) - result = [] - for g in groups: - if type(g) == type(''): - try: - g = self.re.groupindex[g] - except (KeyError, TypeError): - raise IndexError, 'group %r is undefined' % (g,) - if g >= len(self.regs): - raise IndexError, 'group %r is undefined' % (g,) - a, b = self.regs[g] - if a == -1 or b == -1: - result.append(None) - else: - result.append(self.string[a:b]) - if len(result) > 1: - return tuple(result) - elif len(result) == 1: - return result[0] - else: - return () - - def groupdict(self, default=None): - """groupdict([default=None]) -> dictionary - - Return a dictionary containing all the named subgroups of the - match, keyed by the subgroup name. The default argument is - used for groups that did not participate in the match. - - """ - dict = {} - for name, index in self.re.groupindex.items(): - a, b = self.regs[index] - if a == -1 or b == -1: - dict[name] = default - else: - dict[name] = self.string[a:b] - return dict diff --git a/Lib/test/test_sundry.py b/Lib/test/test_sundry.py index 07f4f8b..5112183 100644 --- a/Lib/test/test_sundry.py +++ b/Lib/test/test_sundry.py @@ -5,8 +5,6 @@ warnings.filterwarnings('ignore', r".*posixfile module", DeprecationWarning, 'posixfile$') warnings.filterwarnings('ignore', r".*statcache module", DeprecationWarning, 'statcache$') -warnings.filterwarnings('ignore', r".*'re' module", - DeprecationWarning, 'pre$') from test.test_support import verbose @@ -64,7 +62,6 @@ import pdb import pipes #import poplib import posixfile -import pre import profile import pstats import py_compile |