Source code for mwparserfromhell.nodes.html_entity

# -*- coding: utf-8  -*-
#
# Copyright (C) 2012-2013 Ben Kurtovic <ben.kurtovic@verizon.net>
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from __future__ import unicode_literals

from . import Node
from ..compat import htmlentities, py3k, str

__all__ = ["HTMLEntity"]

[docs]class HTMLEntity(Node): """Represents an HTML entity, like ``&nbsp;``, either named or unnamed.""" def __init__(self, value, named=None, hexadecimal=False, hex_char="x"): super(HTMLEntity, self).__init__() self._value = value if named is None: # Try to guess whether or not the entity is named try: int(value) self._named = False self._hexadecimal = False except ValueError: try: int(value, 16) self._named = False self._hexadecimal = True except ValueError: self._named = True self._hexadecimal = False else: self._named = named self._hexadecimal = hexadecimal self._hex_char = hex_char def __unicode__(self): if self.named: return "&{0};".format(self.value) if self.hexadecimal: return "&#{0}{1};".format(self.hex_char, self.value) return "&#{0};".format(self.value) def __strip__(self, normalize, collapse): if normalize: return self.normalize() return self if not py3k: @staticmethod def _unichr(value): """Implement builtin unichr() with support for non-BMP code points. On wide Python builds, this functions like the normal unichr(). On narrow builds, this returns the value's encoded surrogate pair. """ try: return unichr(value) except ValueError: # Test whether we're on the wide or narrow Python build. Check # the length of a non-BMP code point # (U+1F64A, SPEAK-NO-EVIL MONKEY): if len("\U0001F64A") == 2: # Ensure this is within the range we can encode: if value > 0x10FFFF: raise ValueError("unichr() arg not in range(0x110000)") code = value - 0x10000 if value < 0: # Invalid code point raise lead = 0xD800 + (code >> 10) trail = 0xDC00 + (code % (1 << 10)) return unichr(lead) + unichr(trail) raise @property def value(self): """The string value of the HTML entity.""" return self._value @property def named(self): """Whether the entity is a string name for a codepoint or an integer. For example, ``&Sigma;``, ``&#931;``, and ``&#x3a3;`` refer to the same character, but only the first is "named", while the others are integer representations of the codepoint. """ return self._named @property def hexadecimal(self): """If unnamed, this is whether the value is hexadecimal or decimal.""" return self._hexadecimal @property def hex_char(self): """If the value is hexadecimal, this is the letter denoting that. For example, the hex_char of ``"&#x1234;"`` is ``"x"``, whereas the hex_char of ``"&#X1234;"`` is ``"X"``. Lowercase and uppercase ``x`` are the only values supported. """ return self._hex_char @value.setter
[docs] def value(self, newval): newval = str(newval) try: int(newval) except ValueError: try: int(newval, 16) except ValueError: if newval not in htmlentities.entitydefs: raise ValueError("entity value is not a valid name") self._named = True self._hexadecimal = False else: if int(newval, 16) < 0 or int(newval, 16) > 0x10FFFF: raise ValueError("entity value is not in range(0x110000)") self._named = False self._hexadecimal = True else: test = int(newval, 16 if self.hexadecimal else 10) if test < 0 or test > 0x10FFFF: raise ValueError("entity value is not in range(0x110000)") self._named = False self._value = newval
@named.setter
[docs] def named(self, newval): newval = bool(newval) if newval and self.value not in htmlentities.entitydefs: raise ValueError("entity value is not a valid name") if not newval: try: int(self.value, 16) except ValueError: err = "current entity value is not a valid Unicode codepoint" raise ValueError(err) self._named = newval
@hexadecimal.setter
[docs] def hexadecimal(self, newval): newval = bool(newval) if newval and self.named: raise ValueError("a named entity cannot be hexadecimal") self._hexadecimal = newval
@hex_char.setter
[docs] def hex_char(self, newval): newval = str(newval) if newval not in ("x", "X"): raise ValueError(newval) self._hex_char = newval
[docs] def normalize(self): """Return the unicode character represented by the HTML entity.""" chrfunc = chr if py3k else HTMLEntity._unichr if self.named: return chrfunc(htmlentities.name2codepoint[self.value]) if self.hexadecimal: return chrfunc(int(self.value, 16)) return chrfunc(int(self.value))

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