361 lines
13 KiB
Python
361 lines
13 KiB
Python
from __future__ import unicode_literals
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from __future__ import absolute_import
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from . import util
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from . import odict
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from . import inlinepatterns
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def build_treeprocessors(md_instance, **kwargs):
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""" Build the default treeprocessors for Markdown. """
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treeprocessors = odict.OrderedDict()
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treeprocessors["inline"] = InlineProcessor(md_instance)
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treeprocessors["prettify"] = PrettifyTreeprocessor(md_instance)
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return treeprocessors
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def isString(s):
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""" Check if it's string """
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if not isinstance(s, util.AtomicString):
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return isinstance(s, util.string_type)
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return False
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class Treeprocessor(util.Processor):
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"""
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Treeprocessors are run on the ElementTree object before serialization.
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Each Treeprocessor implements a "run" method that takes a pointer to an
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ElementTree, modifies it as necessary and returns an ElementTree
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object.
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Treeprocessors must extend markdown.Treeprocessor.
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"""
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def run(self, root):
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"""
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Subclasses of Treeprocessor should implement a `run` method, which
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takes a root ElementTree. This method can return another ElementTree
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object, and the existing root ElementTree will be replaced, or it can
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modify the current tree and return None.
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"""
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pass
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class InlineProcessor(Treeprocessor):
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"""
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A Treeprocessor that traverses a tree, applying inline patterns.
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"""
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def __init__(self, md):
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self.__placeholder_prefix = util.INLINE_PLACEHOLDER_PREFIX
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self.__placeholder_suffix = util.ETX
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self.__placeholder_length = 4 + len(self.__placeholder_prefix) \
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+ len(self.__placeholder_suffix)
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self.__placeholder_re = util.INLINE_PLACEHOLDER_RE
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self.markdown = md
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def __makePlaceholder(self, type):
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""" Generate a placeholder """
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id = "%04d" % len(self.stashed_nodes)
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hash = util.INLINE_PLACEHOLDER % id
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return hash, id
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def __findPlaceholder(self, data, index):
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"""
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Extract id from data string, start from index
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Keyword arguments:
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* data: string
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* index: index, from which we start search
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Returns: placeholder id and string index, after the found placeholder.
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"""
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m = self.__placeholder_re.search(data, index)
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if m:
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return m.group(1), m.end()
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else:
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return None, index + 1
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def __stashNode(self, node, type):
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""" Add node to stash """
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placeholder, id = self.__makePlaceholder(type)
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self.stashed_nodes[id] = node
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return placeholder
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def __handleInline(self, data, patternIndex=0):
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"""
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Process string with inline patterns and replace it
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with placeholders
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Keyword arguments:
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* data: A line of Markdown text
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* patternIndex: The index of the inlinePattern to start with
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Returns: String with placeholders.
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"""
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if not isinstance(data, util.AtomicString):
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startIndex = 0
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while patternIndex < len(self.markdown.inlinePatterns):
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data, matched, startIndex = self.__applyPattern(
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self.markdown.inlinePatterns.value_for_index(patternIndex),
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data, patternIndex, startIndex)
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if not matched:
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patternIndex += 1
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return data
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def __processElementText(self, node, subnode, isText=True):
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"""
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Process placeholders in Element.text or Element.tail
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of Elements popped from self.stashed_nodes.
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Keywords arguments:
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* node: parent node
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* subnode: processing node
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* isText: bool variable, True - it's text, False - it's tail
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Returns: None
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"""
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if isText:
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text = subnode.text
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subnode.text = None
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else:
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text = subnode.tail
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subnode.tail = None
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childResult = self.__processPlaceholders(text, subnode)
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if not isText and node is not subnode:
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pos = node.getchildren().index(subnode)
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node.remove(subnode)
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else:
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pos = 0
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childResult.reverse()
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for newChild in childResult:
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node.insert(pos, newChild)
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def __processPlaceholders(self, data, parent):
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"""
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Process string with placeholders and generate ElementTree tree.
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Keyword arguments:
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* data: string with placeholders instead of ElementTree elements.
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* parent: Element, which contains processing inline data
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Returns: list with ElementTree elements with applied inline patterns.
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"""
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def linkText(text):
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if text:
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if result:
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if result[-1].tail:
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result[-1].tail += text
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else:
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result[-1].tail = text
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else:
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if parent.text:
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parent.text += text
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else:
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parent.text = text
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result = []
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strartIndex = 0
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while data:
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index = data.find(self.__placeholder_prefix, strartIndex)
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if index != -1:
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id, phEndIndex = self.__findPlaceholder(data, index)
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if id in self.stashed_nodes:
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node = self.stashed_nodes.get(id)
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if index > 0:
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text = data[strartIndex:index]
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linkText(text)
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if not isString(node): # it's Element
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for child in [node] + node.getchildren():
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if child.tail:
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if child.tail.strip():
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self.__processElementText(node, child,False)
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if child.text:
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if child.text.strip():
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self.__processElementText(child, child)
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else: # it's just a string
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linkText(node)
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strartIndex = phEndIndex
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continue
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strartIndex = phEndIndex
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result.append(node)
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else: # wrong placeholder
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end = index + len(self.__placeholder_prefix)
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linkText(data[strartIndex:end])
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strartIndex = end
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else:
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text = data[strartIndex:]
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if isinstance(data, util.AtomicString):
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# We don't want to loose the AtomicString
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text = util.AtomicString(text)
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linkText(text)
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data = ""
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return result
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def __applyPattern(self, pattern, data, patternIndex, startIndex=0):
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"""
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Check if the line fits the pattern, create the necessary
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elements, add it to stashed_nodes.
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Keyword arguments:
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* data: the text to be processed
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* pattern: the pattern to be checked
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* patternIndex: index of current pattern
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* startIndex: string index, from which we start searching
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Returns: String with placeholders instead of ElementTree elements.
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"""
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match = pattern.getCompiledRegExp().match(data[startIndex:])
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leftData = data[:startIndex]
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if not match:
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return data, False, 0
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node = pattern.handleMatch(match)
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if node is None:
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return data, True, len(leftData)+match.span(len(match.groups()))[0]
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if not isString(node):
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if not isinstance(node.text, util.AtomicString):
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# We need to process current node too
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for child in [node] + node.getchildren():
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if not isString(node):
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if child.text:
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child.text = self.__handleInline(child.text,
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patternIndex + 1)
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if child.tail:
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child.tail = self.__handleInline(child.tail,
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patternIndex)
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placeholder = self.__stashNode(node, pattern.type())
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return "%s%s%s%s" % (leftData,
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match.group(1),
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placeholder, match.groups()[-1]), True, 0
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def run(self, tree):
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"""Apply inline patterns to a parsed Markdown tree.
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Iterate over ElementTree, find elements with inline tag, apply inline
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patterns and append newly created Elements to tree. If you don't
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want to process your data with inline paterns, instead of normal string,
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use subclass AtomicString:
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node.text = markdown.AtomicString("This will not be processed.")
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Arguments:
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* tree: ElementTree object, representing Markdown tree.
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Returns: ElementTree object with applied inline patterns.
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"""
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self.stashed_nodes = {}
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stack = [tree]
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while stack:
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currElement = stack.pop()
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insertQueue = []
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for child in currElement.getchildren():
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if child.text and not isinstance(child.text, util.AtomicString):
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text = child.text
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child.text = None
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lst = self.__processPlaceholders(self.__handleInline(
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text), child)
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stack += lst
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insertQueue.append((child, lst))
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if child.tail:
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tail = self.__handleInline(child.tail)
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dumby = util.etree.Element('d')
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tailResult = self.__processPlaceholders(tail, dumby)
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if dumby.text:
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child.tail = dumby.text
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else:
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child.tail = None
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pos = currElement.getchildren().index(child) + 1
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tailResult.reverse()
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for newChild in tailResult:
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currElement.insert(pos, newChild)
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if child.getchildren():
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stack.append(child)
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for element, lst in insertQueue:
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if self.markdown.enable_attributes:
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if element.text and isString(element.text):
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element.text = \
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inlinepatterns.handleAttributes(element.text,
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element)
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i = 0
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for newChild in lst:
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if self.markdown.enable_attributes:
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# Processing attributes
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if newChild.tail and isString(newChild.tail):
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newChild.tail = \
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inlinepatterns.handleAttributes(newChild.tail,
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element)
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if newChild.text and isString(newChild.text):
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newChild.text = \
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inlinepatterns.handleAttributes(newChild.text,
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newChild)
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element.insert(i, newChild)
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i += 1
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return tree
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class PrettifyTreeprocessor(Treeprocessor):
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""" Add linebreaks to the html document. """
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def _prettifyETree(self, elem):
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""" Recursively add linebreaks to ElementTree children. """
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i = "\n"
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if util.isBlockLevel(elem.tag) and elem.tag not in ['code', 'pre']:
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if (not elem.text or not elem.text.strip()) \
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and len(elem) and util.isBlockLevel(elem[0].tag):
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elem.text = i
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for e in elem:
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if util.isBlockLevel(e.tag):
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self._prettifyETree(e)
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if not elem.tail or not elem.tail.strip():
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elem.tail = i
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if not elem.tail or not elem.tail.strip():
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elem.tail = i
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def run(self, root):
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""" Add linebreaks to ElementTree root object. """
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self._prettifyETree(root)
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# Do <br />'s seperately as they are often in the middle of
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# inline content and missed by _prettifyETree.
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brs = root.getiterator('br')
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for br in brs:
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if not br.tail or not br.tail.strip():
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br.tail = '\n'
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else:
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br.tail = '\n%s' % br.tail
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# Clean up extra empty lines at end of code blocks.
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pres = root.getiterator('pre')
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for pre in pres:
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if len(pre) and pre[0].tag == 'code':
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pre[0].text = pre[0].text.rstrip() + '\n'
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