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"""
Base document tree emitter
~~~~~~~~~~~~~~~~~~~~~~~~~~
:copyleft: 2008-2020 by python-creole team, see AUTHORS for more details.
:license: GNU GPL v3 or above, see LICENSE for more details.
"""
from creole.html_tools.deentity import Deentity
from creole.parser.html_parser_config import BLOCK_TAGS
from creole.shared.markup_table import MarkupTable
from creole.shared.unknown_tags import transparent_unknown_nodes
class BaseEmitter:
"""
Build from a document_tree (html2creole.parser.HtmlParser instance) a
creole markup text.
"""
def __init__(self, document_tree, unknown_emit=None, debug=False):
self.root = document_tree
if unknown_emit is None:
self._unknown_emit = transparent_unknown_nodes
else:
self._unknown_emit = unknown_emit
self.last = None
self.debugging = debug
self.deentity = Deentity() # for replacing html entities
self._inner_list = ""
self._mask_linebreak = False
# --------------------------------------------------------------------------
def blockdata_pass_emit(self, node):
return f"{node.content}\n\n"
return node.content
# --------------------------------------------------------------------------
def data_emit(self, node):
# node.debug()
return node.content
def entityref_emit(self, node):
"""
emit a named html entity
"""
entity = node.content
try:
return self.deentity.replace_named(entity)
except KeyError:
if self.debugging:
print(f"unknown html entity found: {entity!r}")
return f"&{entity}" # FIXME
except UnicodeDecodeError as err:
raise UnicodeError(
f"Error handling entity {entity!r}: {err}"
)
def charref_emit(self, node):
"""
emit a not named html entity
"""
entity = node.content
if entity.startswith("x"):
# entity in hex
hex_no = entity[1:]
return self.deentity.replace_hex(hex_no)
else:
# entity as a unicode number
return self.deentity.replace_number(entity)
# --------------------------------------------------------------------------
def p_emit(self, node):
return "%s\n\n" % self.emit_children(node)
def br_emit(self, node):
if self._inner_list != "":
return "\\\\"
else:
return "\n"
# --------------------------------------------------------------------------
def _typeface(self, node, key):
return key + self.emit_children(node) + key
# --------------------------------------------------------------------------
def li_emit(self, node):
content = self.emit_children(node)
return f"\n{self._inner_list} {content}"
def _list_emit(self, node, list_type):
start_newline = False
if self.last and self.last.kind not in BLOCK_TAGS:
if not self.last.content or not self.last.content.endswith("\n"):
start_newline = True
if self._inner_list == "": # Start a new list
self._inner_list = list_type
else:
self._inner_list += list_type
content = "%s" % self.emit_children(node)
self._inner_list = self._inner_list[:-1]
if self._inner_list == "": # Start a new list
if start_newline:
return "\n" + content + "\n\n"
else:
return content.strip() + "\n\n"
else:
return content
# --------------------------------------------------------------------------
def table_emit(self, node):
self._table = MarkupTable(
head_prefix=self.table_head_prefix,
auto_width=self.table_auto_width,
debug_msg=self.debug_msg
)
self.emit_children(node)
content = self._table.get_table_markup()
return f"{content}\n"
def tr_emit(self, node):
self._table.add_tr()
self.emit_children(node)
return ""
def _escape_linebreaks(self, text):
text = text.strip()
text = text.split("\n")
lines = [line.strip() for line in text]
lines = [line for line in lines if line]
content = "\\\\".join(lines)
content = content.strip("\\")
return content
def th_emit(self, node):
content = self.emit_children(node)
content = self._escape_linebreaks(content)
self._table.add_th(content)
return ""
def td_emit(self, node):
content = self.emit_children(node)
content = self._escape_linebreaks(content)
self._table.add_td(content)
return ""
# --------------------------------------------------------------------------
def _emit_content(self, node):
content = self.emit_children(node)
content = self._escape_linebreaks(content)
if node.kind in BLOCK_TAGS:
content = f"{content}\n\n"
return content
def div_emit(self, node):
return self._emit_content(node)
def span_emit(self, node):
return self._emit_content(node)
# --------------------------------------------------------------------------
def document_emit(self, node):
self.last = node
return self.emit_children(node)
def emit_children(self, node):
"""Emit all the children of a node."""
return "".join(self.emit_children_list(node))
def emit_children_list(self, node):
"""Emit all the children of a node."""
self.last = node
result = []
for child in node.children:
content = self.emit_node(child)
assert isinstance(content, str)
result.append(content)
return result
def emit_node(self, node):
"""Emit a single node."""
def unicode_error(method_name, method, node, content):
node.debug()
raise AssertionError(
f"Method '{method_name}' ({method}) returns no unicode - returns: {repr(content)} ({type(content)})"
)
if node.level:
self.debug_msg("emit_node", f"{node.kind} (level: {node.level:d}): {node.content!r}")
else:
self.debug_msg("emit_node", f"{node.kind}: {node.content!r}")
method_name = f"{node.kind}_emit"
emit_method = getattr(self, method_name, None)
if emit_method:
content = emit_method(node)
if not isinstance(content, str):
unicode_error(method_name, emit_method, node, content)
else:
content = self._unknown_emit(self, node)
if not isinstance(content, str):
unicode_error(method_name, self._unknown_emit, node, content)
self.last = node
return content
# def emit(self):
# """Emit the document represented by self.root DOM tree."""
# result = self.emit_node(self.root)
# return result.strip() # FIXME
# return result.rstrip() # FIXME
# -------------------------------------------------------------------------
def debug_msg(self, method, txt):
if not self.debugging:
return
print(f"{method:>13}: {txt}")
|
