9578053 Jan 22 2022 distfiles.gentoo.org/distfiles/gajim-1.3.3-2.tar.gz

gajim/common/regex.py

@@ -0,0 +1,88 @@
+import re
+
+def _get_link_pattern():
+    # regexp meta characters are:  . ^ $ * + ? { } [ ] \ | ( )
+    # one escapes the metachars with \
+    # \S matches anything but ' ' '\t' '\n' '\r' '\f' and '\v'
+    # \s matches any whitespace character
+    # \w any alphanumeric character
+    # \W any non-alphanumeric character
+    # \b means word boundary. This is a zero-width assertion that
+    #    matches only at the beginning or end of a word.
+    # ^ matches at the beginning of lines
+    #
+    # * means 0 or more times
+    # + means 1 or more times
+    # ? means 0 or 1 time
+    # | means or
+    # [^*] anything but '*' (inside [] you don't have to escape metachars)
+    # [^\s*] anything but whitespaces and '*'
+    # (?<!\S) is a one char lookbehind assertion and asks for any leading
+    #         whitespace
+    # and matches beginning of lines so we have correct formatting detection
+    # even if the text is just '*foo*'
+    # (?!\S) is the same thing but it's a lookahead assertion
+    # \S*[^\s\W] --> in the matching string don't match ? or ) etc.. if at
+    #                the end
+    # so http://be) will match http://be and http://be)be) will match
+    # http://be)be
+
+    legacy_prefixes = r"((?<=\()(www|ftp)\.([A-Za-z0-9\.\-_~:/\?#\[\]@!\$"\
+        r"&'\(\)\*\+,;=]|%[A-Fa-f0-9]{2})+(?=\)))"\
+        r"|((www|ftp)\.([A-Za-z0-9\.\-_~:/\?#\[\]@!\$&'\(\)\*\+,;=]"\
+        r"|%[A-Fa-f0-9]{2})+"\
+        r"\.([A-Za-z0-9\.\-_~:/\?#\[\]@!\$&'\(\)\*\+,;=]|%[A-Fa-f0-9]{2})+)"
+    # NOTE: it's ok to catch www.gr such stuff exist!
+
+    # FIXME: recognize xmpp: and treat it specially
+    links = r"((?<=\()[A-Za-z][A-Za-z0-9\+\.\-]*:"\
+        r"([\w\.\-_~:/\?#\[\]@!\$&'\(\)\*\+,;=]|%[A-Fa-f0-9]{2})+"\
+        r"(?=\)))|(\w[\w\+\.\-]*:([^<>\s]|%[A-Fa-f0-9]{2})+)"
+
+    # 2nd one: at_least_one_char@at_least_one_char.at_least_one_char
+    mail = r'\bmailto:\S*[^\s\W]|' r'\b\S+@\S+\.\S*[^\s\W]'
+
+    link_pattern = links + '|' + mail + '|' + legacy_prefixes
+    return link_pattern
+
+def _get_basic_pattern():
+    basic_pattern = _get_link_pattern()
+    # detects eg. *b* *bold* *bold bold* test *bold* *bold*! (*bold*)
+    # doesn't detect (it's a feature :P) * bold* *bold * * bold * test*bold*
+    formatting = r'|(?<!\w)' r'\*[^\s*]' r'([^*]*[^\s*])?' r'\*(?!\w)|'\
+        r'(?<!\S)' r'~[^\s~]' r'([^~]*[^\s~])?' r'~(?!\S)|'\
+        r'(?<!\w)' r'_[^\s_]' r'([^_]*[^\s_])?' r'_(?!\w)'
+    return basic_pattern + formatting
+
+def _get_emot_and_basic_pattern(use_ascii_formatting=True):
+    from gajim.gui.emoji_data import emoji_data
+    # because emoticons match later (in the string) they need to be after
+    # basic matches that may occur earlier
+    emoticons = emoji_data.get_regex()
+
+    if use_ascii_formatting:
+        pattern = _get_basic_pattern()
+    else:
+        pattern = _get_link_pattern()
+
+    return '%s|%s' % (pattern, emoticons)
+
+LINK_REGEX = re.compile(_get_link_pattern(), re.I | re.U)
+
+# link pattern + ASCII formatting
+BASIC_REGEX = re.compile(_get_basic_pattern(), re.IGNORECASE)
+
+# emoticons + link pattern
+EMOT_AND_LINK_REGEX = re.compile(_get_emot_and_basic_pattern(False),
+                                          re.IGNORECASE)
+
+# emoticons + link pattern + ASCII formatting
+EMOT_AND_BASIC_REGEX = re.compile(_get_emot_and_basic_pattern(True),
+                                          re.IGNORECASE)
+
+INVALID_XML_CHARS_REGEX = re.compile(
+    '[\x00-\x08]|[\x0b-\x0c]|[\x0e-\x1f]|[\ud800-\udfff]|[\ufffe-\uffff]')
+
+# at least one character in 3 parts (before @, after @, after .)
+STH_AT_STH_DOT_STH_REGEX = re.compile(
+    r'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$')