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import re
_LINE_END = re.compile(r'\n|$')
class BlockState:
"""The state to save block parser's cursor and tokens."""
def __init__(self, parent=None):
self.src = ''
self.tokens = []
# current cursor position
self.cursor = 0
self.cursor_max = 0
# for list and block quote chain
self.list_tight = True
self.parent = parent
# for saving def references
if parent:
self.env = parent.env
else:
self.env = {'ref_links': {}}
def child_state(self, src):
child = self.__class__(self)
child.process(src)
return child
def process(self, src):
self.src = src
self.cursor_max = len(src)
def find_line_end(self):
m = _LINE_END.search(self.src, self.cursor)
return m.end()
def get_text(self, end_pos):
return self.src[self.cursor:end_pos]
def last_token(self):
if self.tokens:
return self.tokens[-1]
def prepend_token(self, token):
"""Insert token before the last token."""
self.tokens.insert(len(self.tokens) - 1, token)
def append_token(self, token):
"""Add token to the end of token list."""
self.tokens.append(token)
def add_paragraph(self, text):
last_token = self.last_token()
if last_token and last_token['type'] == 'paragraph':
last_token['text'] += text
else:
self.tokens.append({'type': 'paragraph', 'text': text})
def append_paragraph(self):
last_token = self.last_token()
if last_token and last_token['type'] == 'paragraph':
pos = self.find_line_end()
last_token['text'] += self.get_text(pos)
return pos
def depth(self):
d = 0
parent = self.parent
while parent:
d += 1
parent = parent.parent
return d
class InlineState:
"""The state to save inline parser's tokens."""
def __init__(self, env):
self.env = env
self.src = ''
self.tokens = []
self.in_image = False
self.in_link = False
self.in_emphasis = False
self.in_strong = False
def prepend_token(self, token):
"""Insert token before the last token."""
self.tokens.insert(len(self.tokens) - 1, token)
def append_token(self, token):
"""Add token to the end of token list."""
self.tokens.append(token)
def copy(self):
"""Create a copy of current state."""
state = self.__class__(self.env)
state.in_image = self.in_image
state.in_link = self.in_link
state.in_emphasis = self.in_emphasis
state.in_strong = self.in_strong
return state
class Parser:
sc_flag = re.M
state_cls = BlockState
SPECIFICATION = {}
DEFAULT_RULES = []
def __init__(self):
self.specification = self.SPECIFICATION.copy()
self.rules = list(self.DEFAULT_RULES)
self._methods = {}
self.__sc = {}
def compile_sc(self, rules=None):
if rules is None:
key = '$'
rules = self.rules
else:
key = '|'.join(rules)
sc = self.__sc.get(key)
if sc:
return sc
regex = '|'.join(r'(?P<%s>%s)' % (k, self.specification[k]) for k in rules)
sc = re.compile(regex, self.sc_flag)
self.__sc[key] = sc
return sc
def register(self, name, pattern, func, before=None):
"""Register a new rule to parse the token. This method is usually used to
create a new plugin.
:param name: name of the new grammar
:param pattern: regex pattern in string
:param func: the parsing function
:param before: insert this rule before a built-in rule
"""
self._methods[name] = lambda m, state: func(self, m, state)
if pattern:
self.specification[name] = pattern
if name not in self.rules:
self.insert_rule(self.rules, name, before=before)
def register_rule(self, name, pattern, func):
raise DeprecationWarning('This plugin is not compatible with mistune v3.')
@staticmethod
def insert_rule(rules, name, before=None):
if before:
try:
index = rules.index(before)
rules.insert(index, name)
except ValueError:
rules.append(name)
else:
rules.append(name)
def parse_method(self, m, state):
func = self._methods[m.lastgroup]
return func(m, state)
class BaseRenderer(object):
NAME = 'base'
def __init__(self):
self.__methods = {}
def register(self, name, method):
"""Register a render method for the named token. For example::
def render_wiki(renderer, key, title):
return f'<a href="/wiki/{key}">{title}</a>'
renderer.register('wiki', render_wiki)
"""
# bind self into renderer method
self.__methods[name] = lambda *arg, **kwargs: method(self, *arg, **kwargs)
def _get_method(self, name):
try:
return object.__getattribute__(self, name)
except AttributeError:
method = self.__methods.get(name)
if not method:
raise AttributeError('No renderer "{!r}"'.format(name))
return method
def render_token(self, token, state):
func = self._get_method(token['type'])
return func(token, state)
def iter_tokens(self, tokens, state):
for tok in tokens:
yield self.render_token(tok, state)
def render_tokens(self, tokens, state):
return ''.join(self.iter_tokens(tokens, state))
def __call__(self, tokens, state):
return self.render_tokens(tokens, state)
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