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""" babel.util ~~~~~~~~~~ Various utility classes and functions. :copyright: (c) 2013-2022 by the Babel Team. :license: BSD, see LICENSE for more details. """ import codecs import collections from datetime import timedelta, tzinfo import os import re import textwrap import pytz as _pytz from babel import localtime missing = object() def distinct(iterable): """Yield all items in an iterable collection that are distinct. Unlike when using sets for a similar effect, the original ordering of the items in the collection is preserved by this function. >>> print(list(distinct([1, 2, 1, 3, 4, 4]))) [1, 2, 3, 4] >>> print(list(distinct('foobar'))) ['f', 'o', 'b', 'a', 'r'] :param iterable: the iterable collection providing the data """ seen = set() for item in iter(iterable): if item not in seen: yield item seen.add(item) # Regexp to match python magic encoding line PYTHON_MAGIC_COMMENT_re = re.compile( br'[ \t\f]* \# .* coding[=:][ \t]*([-\w.]+)', re.VERBOSE) def parse_encoding(fp): """Deduce the encoding of a source file from magic comment. It does this in the same way as the `Python interpreter`__ .. __: https://docs.python.org/3.4/reference/lexical_analysis.html#encoding-declarations The ``fp`` argument should be a seekable file object. (From Jeff Dairiki) """ pos = fp.tell() fp.seek(0) try: line1 = fp.readline() has_bom = line1.startswith(codecs.BOM_UTF8) if has_bom: line1 = line1[len(codecs.BOM_UTF8):] m = PYTHON_MAGIC_COMMENT_re.match(line1) if not m: try: import ast ast.parse(line1.decode('latin-1')) except (ImportError, SyntaxError, UnicodeEncodeError): # Either it's a real syntax error, in which case the source is # not valid python source, or line2 is a continuation of line1, # in which case we don't want to scan line2 for a magic # comment. pass else: line2 = fp.readline() m = PYTHON_MAGIC_COMMENT_re.match(line2) if has_bom: if m: magic_comment_encoding = m.group(1).decode('latin-1') if magic_comment_encoding != 'utf-8': raise SyntaxError( 'encoding problem: {0} with BOM'.format( magic_comment_encoding)) return 'utf-8' elif m: return m.group(1).decode('latin-1') else: return None finally: fp.seek(pos) PYTHON_FUTURE_IMPORT_re = re.compile( r'from\s+__future__\s+import\s+$*(.+)$*') def parse_future_flags(fp, encoding='latin-1'): """Parse the compiler flags by :mod:`__future__` from the given Python code. """ import __future__ pos = fp.tell() fp.seek(0) flags = 0 try: body = fp.read().decode(encoding) # Fix up the source to be (hopefully) parsable by regexpen. # This will likely do untoward things if the source code itself is broken. # (1) Fix `import (\n...` to be `import (...`. body = re.sub(r'import\s*\([\r\n]+', 'import (', body) # (2) Join line-ending commas with the next line. body = re.sub(r',\s*[\r\n]+', ', ', body) # (3) Remove backslash line continuations. body = re.sub(r'\\\s*[\r\n]+', ' ', body) for m in PYTHON_FUTURE_IMPORT_re.finditer(body): names = [x.strip().strip('()') for x in m.group(1).split(',')] for name in names: feature = getattr(__future__, name, None) if feature: flags |= feature.compiler_flag finally: fp.seek(pos) return flags def pathmatch(pattern, filename): """Extended pathname pattern matching. This function is similar to what is provided by the ``fnmatch`` module in the Python standard library, but: * can match complete (relative or absolute) path names, and not just file names, and * also supports a convenience pattern ("**") to match files at any directory level. Examples: >>> pathmatch('**.py', 'bar.py') True >>> pathmatch('**.py', 'foo/bar/baz.py') True >>> pathmatch('**.py', 'templates/index.html') False >>> pathmatch('./foo/**.py', 'foo/bar/baz.py') True >>> pathmatch('./foo/**.py', 'bar/baz.py') False >>> pathmatch('^foo/**.py', 'foo/bar/baz.py') True >>> pathmatch('^foo/**.py', 'bar/baz.py') False >>> pathmatch('**/templates/*.html', 'templates/index.html') True >>> pathmatch('**/templates/*.html', 'templates/foo/bar.html') False :param pattern: the glob pattern :param filename: the path name of the file to match against """ symbols = { '?': '[^/]', '?/': '[^/]/', '*': '[^/]+', '*/': '[^/]+/', '**/': '(?:.+/)*?', '**': '(?:.+/)*?[^/]+', } if pattern.startswith('^'): buf = ['^'] pattern = pattern[1:] elif pattern.startswith('./'): buf = ['^'] pattern = pattern[2:] else: buf = [] for idx, part in enumerate(re.split('([?*]+/?)', pattern)): if idx % 2: buf.append(symbols[part]) elif part: buf.append(re.escape(part)) match = re.match(''.join(buf) + '$', filename.replace(os.sep, '/')) return match is not None class TextWrapper(textwrap.TextWrapper): wordsep_re = re.compile( r'(\s+|' # any whitespace r'(?<=[\w\!\"\'\&\.\,\?])-{2,}(?=\w))' # em-dash ) def wraptext(text, width=70, initial_indent='', subsequent_indent=''): """Simple wrapper around the ``textwrap.wrap`` function in the standard library. This version does not wrap lines on hyphens in words. :param text: the text to wrap :param width: the maximum line width :param initial_indent: string that will be prepended to the first line of wrapped output :param subsequent_indent: string that will be prepended to all lines save the first of wrapped output """ wrapper = TextWrapper(width=width, initial_indent=initial_indent, subsequent_indent=subsequent_indent, break_long_words=False) return wrapper.wrap(text) # TODO (Babel 3.x): Remove this re-export odict = collections.OrderedDict class FixedOffsetTimezone(tzinfo): """Fixed offset in minutes east from UTC.""" def __init__(self, offset, name=None): self._offset = timedelta(minutes=offset) if name is None: name = 'Etc/GMT%+d' % offset self.zone = name def __str__(self): return self.zone def __repr__(self): return '<FixedOffset "%s" %s>' % (self.zone, self._offset) def utcoffset(self, dt): return self._offset def tzname(self, dt): return self.zone def dst(self, dt): return ZERO # Export the localtime functionality here because that's # where it was in the past. UTC = _pytz.utc LOCALTZ = localtime.LOCALTZ get_localzone = localtime.get_localzone STDOFFSET = localtime.STDOFFSET DSTOFFSET = localtime.DSTOFFSET DSTDIFF = localtime.DSTDIFF ZERO = localtime.ZERO def _cmp(a, b): return (a > b) - (a < b)