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# -*- coding: utf-8 -*-
from __future__ import unicode_literals
import re
import sys
"""
Python 3 Stuff
=============================================================================
"""
PY3 = sys.version_info[0] == 3
if PY3: # pragma: no cover
string_type = str
text_type = str
int2str = chr
else: # pragma: no cover
string_type = basestring # noqa
text_type = unicode # noqa
int2str = unichr # noqa
"""
Constants you might want to modify
-----------------------------------------------------------------------------
"""
BLOCK_LEVEL_ELEMENTS = re.compile(
"^(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul"
"|script|noscript|form|fieldset|iframe|math"
"|hr|hr/|style|li|dt|dd|thead|tbody"
"|tr|th|td|section|footer|header|group|figure"
"|figcaption|aside|article|canvas|output"
"|progress|video|nav|main)$",
re.IGNORECASE
)
# Placeholders
STX = '\u0002' # Use STX ("Start of text") for start-of-placeholder
ETX = '\u0003' # Use ETX ("End of text") for end-of-placeholder
INLINE_PLACEHOLDER_PREFIX = STX+"klzzwxh:"
INLINE_PLACEHOLDER = INLINE_PLACEHOLDER_PREFIX + "%s" + ETX
INLINE_PLACEHOLDER_RE = re.compile(INLINE_PLACEHOLDER % r'([0-9]+)')
AMP_SUBSTITUTE = STX+"amp"+ETX
HTML_PLACEHOLDER = STX + "wzxhzdk:%s" + ETX
HTML_PLACEHOLDER_RE = re.compile(HTML_PLACEHOLDER % r'([0-9]+)')
TAG_PLACEHOLDER = STX + "hzzhzkh:%s" + ETX
"""
Constants you probably do not need to change
-----------------------------------------------------------------------------
"""
RTL_BIDI_RANGES = (
('\u0590', '\u07FF'),
# Hebrew (0590-05FF), Arabic (0600-06FF),
# Syriac (0700-074F), Arabic supplement (0750-077F),
# Thaana (0780-07BF), Nko (07C0-07FF).
('\u2D30', '\u2D7F') # Tifinagh
)
# Extensions should use "markdown.util.etree" instead of "etree" (or do `from
# markdown.util import etree`). Do not import it by yourself.
try: # pragma: no cover
# Is the C implementation of ElementTree available?
import xml.etree.cElementTree as etree
from xml.etree.ElementTree import Comment
# Serializers (including ours) test with non-c Comment
etree.test_comment = Comment
if etree.VERSION < "1.0.5":
raise RuntimeError("cElementTree version 1.0.5 or higher is required.")
except (ImportError, RuntimeError): # pragma: no cover
# Use the Python implementation of ElementTree?
import xml.etree.ElementTree as etree
if etree.VERSION < "1.1":
raise RuntimeError("ElementTree version 1.1 or higher is required")
"""
AUXILIARY GLOBAL FUNCTIONS
=============================================================================
"""
def isBlockLevel(tag):
"""Check if the tag is a block level HTML tag."""
if isinstance(tag, string_type):
return BLOCK_LEVEL_ELEMENTS.match(tag)
# Some ElementTree tags are not strings, so return False.
return False
def parseBoolValue(value, fail_on_errors=True, preserve_none=False):
"""Parses a string representing bool value. If parsing was successful,
returns True or False. If preserve_none=True, returns True, False,
or None. If parsing was not successful, raises ValueError, or, if
fail_on_errors=False, returns None."""
if not isinstance(value, string_type):
if preserve_none and value is None:
return value
return bool(value)
elif preserve_none and value.lower() == 'none':
return None
elif value.lower() in ('true', 'yes', 'y', 'on', '1'):
return True
elif value.lower() in ('false', 'no', 'n', 'off', '0', 'none'):
return False
elif fail_on_errors:
raise ValueError('Cannot parse bool value: %r' % value)
"""
MISC AUXILIARY CLASSES
=============================================================================
"""
class AtomicString(text_type):
"""A string which should not be further processed."""
pass
class Processor(object):
def __init__(self, markdown_instance=None):
if markdown_instance:
self.markdown = markdown_instance
class HtmlStash(object):
"""
This class is used for stashing HTML objects that we extract
in the beginning and replace with place-holders.
"""
def __init__(self):
""" Create a HtmlStash. """
self.html_counter = 0 # for counting inline html segments
self.rawHtmlBlocks = []
self.tag_counter = 0
self.tag_data = [] # list of dictionaries in the order tags appear
def store(self, html, safe=False):
"""
Saves an HTML segment for later reinsertion. Returns a
placeholder string that needs to be inserted into the
document.
Keyword arguments:
* html: an html segment
* safe: label an html segment as safe for safemode
Returns : a placeholder string
"""
self.rawHtmlBlocks.append((html, safe))
placeholder = self.get_placeholder(self.html_counter)
self.html_counter += 1
return placeholder
def reset(self):
self.html_counter = 0
self.rawHtmlBlocks = []
def get_placeholder(self, key):
return HTML_PLACEHOLDER % key
def store_tag(self, tag, attrs, left_index, right_index):
"""Store tag data and return a placeholder."""
self.tag_data.append({'tag': tag, 'attrs': attrs,
'left_index': left_index,
'right_index': right_index})
placeholder = TAG_PLACEHOLDER % str(self.tag_counter)
self.tag_counter += 1 # equal to the tag's index in self.tag_data
return placeholder
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