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from __future__ import absolute_import, unicode_literals |
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import re |
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from importlib import import_module |
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from CommonMark import common |
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from CommonMark.common import unescape_string |
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from CommonMark.inlines import InlineParser |
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from CommonMark.node import Node |
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from CommonMark.utils import to_camel_case |
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CODE_INDENT = 4 |
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reHtmlBlockOpen = [ |
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re.compile(r'.'), # dummy for 0 |
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re.compile(r'^<(?:script|pre|style)(?:\s|>|$)', re.IGNORECASE), |
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re.compile(r'^<!--'), |
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re.compile(r'^<[?]'), |
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re.compile(r'^<![A-Z]'), |
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re.compile(r'^<!\[CDATA\['), |
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re.compile( |
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r'^<[/]?(?:address|article|aside|base|basefont|blockquote|body|' |
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r'caption|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|' |
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r'fieldset|figcaption|figure|footer|form|frame|frameset|h1|head|' |
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r'header|hr|html|iframe|legend|li|link|main|menu|menuitem|meta|' |
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r'nav|noframes|ol|optgroup|option|p|param|section|source|title|' |
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r'summary|table|tbody|td|tfoot|th|thead|title|tr|track|ul)' |
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r'(?:\s|[/]?[>]|$)', |
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re.IGNORECASE), |
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re.compile( |
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'^(?:' + common.OPENTAG + '|' + common.CLOSETAG + ')\\s*$', |
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re.IGNORECASE), |
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] |
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reHtmlBlockClose = [ |
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re.compile(r'.'), # dummy for 0 |
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re.compile(r'<\/(?:script|pre|style)>', re.IGNORECASE), |
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re.compile(r'-->'), |
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re.compile(r'\?>'), |
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re.compile(r'>'), |
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re.compile(r'\]\]>'), |
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] |
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reThematicBreak = re.compile( |
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r'^(?:(?:\*[ \t]*){3,}|(?:_[ \t]*){3,}|(?:-[ \t]*){3,})[ \t]*$') |
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reMaybeSpecial = re.compile(r'^[#`~*+_=<>0-9-]') |
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reNonSpace = re.compile(r'[^ \t\f\v\r\n]') |
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reBulletListMarker = re.compile(r'^[*+-]') |
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reOrderedListMarker = re.compile(r'^(\d{1,9})([.)])') |
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reATXHeadingMarker = re.compile(r'^#{1,6}(?:[ \t]+|$)') |
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reCodeFence = re.compile(r'^`{3,}(?!.*`)|^~{3,}(?!.*~)') |
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reClosingCodeFence = re.compile(r'^(?:`{3,}|~{3,})(?= *$)') |
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reSetextHeadingLine = re.compile(r'^(?:=+|-+)[ \t]*$') |
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reLineEnding = re.compile(r'\r\n|\n|\r') |
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def is_blank(s): |
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"""Returns True if string contains only space characters.""" |
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return re.search(reNonSpace, s) is None |
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def is_space_or_tab(s): |
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return s == ' ' or s == '\t' |
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def peek(ln, pos): |
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if pos < len(ln): |
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return ln[pos] |
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else: |
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return None |
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def ends_with_blank_line(block): |
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""" Returns true if block ends with a blank line, |
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descending if needed into lists and sublists.""" |
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while block: |
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if block.last_line_blank: |
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return True |
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if (block.t == 'list' or block.t == 'item'): |
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block = block.last_child |
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else: |
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break |
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return False |
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def parse_list_marker(parser, container): |
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""" Parse a list marker and return data on the marker (type, |
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start, delimiter, bullet character, padding) or None.""" |
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rest = parser.current_line[parser.next_nonspace:] |
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data = { |
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'type': None, |
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'tight': True, # lists are tight by default |
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'bullet_char': None, |
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'start': None, |
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'delimiter': None, |
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'padding': None, |
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'marker_offset': parser.indent, |
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} |
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m = re.search(reBulletListMarker, rest) |
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m2 = re.search(reOrderedListMarker, rest) |
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if m: |
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data['type'] = 'bullet' |
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data['bullet_char'] = m.group()[0] |
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elif m2 and (container.t != 'paragraph' or m2.group(1) == '1'): |
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m = m2 |
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data['type'] = 'ordered' |
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data['start'] = int(m.group(1)) |
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data['delimiter'] = m.group(2) |
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else: |
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return None |
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# make sure we have spaces after |
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nextc = peek(parser.current_line, parser.next_nonspace + len(m.group())) |
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if not (nextc is None or nextc == '\t' or nextc == ' '): |
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return None |
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# if it interrupts paragraph, make sure first line isn't blank |
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if container.t == 'paragraph' and \ |
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not re.search( |
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reNonSpace, |
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parser.current_line[parser.next_nonspace + len(m.group()):]): |
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return None |
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# we've got a match! advance offset and calculate padding |
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parser.advance_next_nonspace() # to start of marker |
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parser.advance_offset(len(m.group()), True) # to end of marker |
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spaces_start_col = parser.column |
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spaces_start_offset = parser.offset |
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while True: |
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parser.advance_offset(1, True) |
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nextc = peek(parser.current_line, parser.offset) |
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if parser.column - spaces_start_col < 5 and \ |
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is_space_or_tab(nextc): |
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pass |
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else: |
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break |
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blank_item = peek(parser.current_line, parser.offset) is None |
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spaces_after_marker = parser.column - spaces_start_col |
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if spaces_after_marker >= 5 or \ |
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spaces_after_marker < 1 or \ |
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blank_item: |
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data['padding'] = len(m.group()) + 1 |
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parser.column = spaces_start_col |
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parser.offset = spaces_start_offset |
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if is_space_or_tab(peek(parser.current_line, parser.offset)): |
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parser.advance_offset(1, True) |
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else: |
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data['padding'] = len(m.group()) + spaces_after_marker |
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return data |
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def lists_match(list_data, item_data): |
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""" |
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Returns True if the two list items are of the same type, |
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with the same delimiter and bullet character. This is used |
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in agglomerating list items into lists. |
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""" |
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return list_data.get('type') == item_data.get('type') and \ |
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list_data.get('delimiter') == item_data.get('delimiter') and \ |
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list_data.get('bullet_char') == item_data.get('bullet_char') |
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class Block(object): |
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accepts_lines = None |
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@staticmethod |
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def continue_(parser=None, container=None): |
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return |
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@staticmethod |
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def finalize(parser=None, block=None): |
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return |
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@staticmethod |
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def can_contain(t): |
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return |
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class Document(Block): |
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accepts_lines = False |
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@staticmethod |
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def continue_(parser=None, container=None): |
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return 0 |
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@staticmethod |
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def finalize(parser=None, block=None): |
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return |
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@staticmethod |
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def can_contain(t): |
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return t != 'item' |
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class List(Block): |
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accepts_lines = False |
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@staticmethod |
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def continue_(parser=None, container=None): |
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return 0 |
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@staticmethod |
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def finalize(parser=None, block=None): |
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item = block.first_child |
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while item: |
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# check for non-final list item ending with blank line: |
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if ends_with_blank_line(item) and item.nxt: |
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block.list_data['tight'] = False |
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break |
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# recurse into children of list item, to see if there are |
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# spaces between any of them: |
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subitem = item.first_child |
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while subitem: |
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if ends_with_blank_line(subitem) and \ |
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(item.nxt or subitem.nxt): |
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block.list_data['tight'] = False |
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break |
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subitem = subitem.nxt |
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item = item.nxt |
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@staticmethod |
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def can_contain(t): |
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return t == 'item' |
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224
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225
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class BlockQuote(Block): |
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accepts_lines = False |
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@staticmethod |
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def continue_(parser=None, container=None): |
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ln = parser.current_line |
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if not parser.indented and peek(ln, parser.next_nonspace) == '>': |
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parser.advance_next_nonspace() |
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parser.advance_offset(1, False) |
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if is_space_or_tab(peek(ln, parser.offset)): |
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parser.advance_offset(1, True) |
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else: |
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return 1 |
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return 0 |
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@staticmethod |
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def finalize(parser=None, block=None): |
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return |
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@staticmethod |
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def can_contain(t): |
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return t != 'item' |
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class Item(Block): |
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accepts_lines = False |
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@staticmethod |
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def continue_(parser=None, container=None): |
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if parser.blank: |
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if container.first_child is None: |
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# Blank line after empty list item |
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return 1 |
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else: |
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parser.advance_next_nonspace() |
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elif parser.indent >= (container.list_data['marker_offset'] + |
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container.list_data['padding']): |
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parser.advance_offset( |
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container.list_data['marker_offset'] + |
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container.list_data['padding'], True) |
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else: |
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return 1 |
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return 0 |
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269
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@staticmethod |
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def finalize(parser=None, block=None): |
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return |
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273
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@staticmethod |
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def can_contain(t): |
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return t != 'item' |
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276
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277
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278
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class Heading(Block): |
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accepts_lines = False |
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281
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@staticmethod |
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def continue_(parser=None, container=None): |
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# A heading can never container > 1 line, so fail to match: |
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return 1 |
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285
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286
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@staticmethod |
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287
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def finalize(parser=None, block=None): |
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288
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return |
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289
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290
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@staticmethod |
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291
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def can_contain(t): |
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292
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return False |
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293
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294
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295
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class ThematicBreak(Block): |
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296
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accepts_lines = False |
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297
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298
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@staticmethod |
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299
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def continue_(parser=None, container=None): |
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300
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# A thematic break can never container > 1 line, so fail to match: |
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301
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return 1 |
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302
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303
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@staticmethod |
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304
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def finalize(parser=None, block=None): |
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return |
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306
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307
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@staticmethod |
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308
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def can_contain(t): |
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return False |
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310
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311
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312
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class CodeBlock(Block): |
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313
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accepts_lines = True |
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314
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315
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@staticmethod |
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316
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def continue_(parser=None, container=None): |
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317
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ln = parser.current_line |
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318
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indent = parser.indent |
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319
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if container.is_fenced: |
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320
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match = indent <= 3 and \ |
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321
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len(ln) >= parser.next_nonspace + 1 and \ |
|
322
|
|
|
ln[parser.next_nonspace] == container.fence_char and \ |
|
323
|
|
|
re.search(reClosingCodeFence, ln[parser.next_nonspace:]) |
|
324
|
|
|
if match and len(match.group()) >= container.fence_length: |
|
325
|
|
|
# closing fence - we're at end of line, so we can return |
|
326
|
|
|
parser.finalize(container, parser.line_number) |
|
327
|
|
|
return 2 |
|
328
|
|
|
else: |
|
329
|
|
|
# skip optional spaces of fence offset |
|
330
|
|
|
i = container.fence_offset |
|
331
|
|
|
while i > 0 and is_space_or_tab(peek(ln, parser.offset)): |
|
332
|
|
|
parser.advance_offset(1, True) |
|
333
|
|
|
i -= 1 |
|
334
|
|
|
else: |
|
335
|
|
|
# indented |
|
336
|
|
|
if indent >= CODE_INDENT: |
|
337
|
|
|
parser.advance_offset(CODE_INDENT, True) |
|
338
|
|
|
elif parser.blank: |
|
339
|
|
|
parser.advance_next_nonspace() |
|
340
|
|
|
else: |
|
341
|
|
|
return 1 |
|
342
|
|
|
return 0 |
|
343
|
|
|
|
|
344
|
|
|
@staticmethod |
|
345
|
|
|
def finalize(parser=None, block=None): |
|
346
|
|
|
if block.is_fenced: |
|
347
|
|
|
# first line becomes info string |
|
348
|
|
|
content = block.string_content |
|
349
|
|
|
newline_pos = content.index('\n') |
|
350
|
|
|
first_line = content[0:newline_pos] |
|
351
|
|
|
rest = content[newline_pos + 1:] |
|
352
|
|
|
block.info = unescape_string(first_line.strip()) |
|
353
|
|
|
block.literal = rest |
|
354
|
|
|
else: |
|
355
|
|
|
# indented |
|
356
|
|
|
block.literal = re.sub(r'(\n *)+$', '\n', block.string_content) |
|
357
|
|
|
|
|
358
|
|
|
block.string_content = None |
|
359
|
|
|
|
|
360
|
|
|
@staticmethod |
|
361
|
|
|
def can_contain(t): |
|
362
|
|
|
return False |
|
363
|
|
|
|
|
364
|
|
|
|
|
365
|
|
|
class HtmlBlock(Block): |
|
366
|
|
|
accepts_lines = True |
|
367
|
|
|
|
|
368
|
|
|
@staticmethod |
|
369
|
|
|
def continue_(parser=None, container=None): |
|
370
|
|
|
if parser.blank and (container.html_block_type == 6 or |
|
371
|
|
|
container.html_block_type == 7): |
|
372
|
|
|
return 1 |
|
373
|
|
|
else: |
|
374
|
|
|
return 0 |
|
375
|
|
|
|
|
376
|
|
|
@staticmethod |
|
377
|
|
|
def finalize(parser=None, block=None): |
|
378
|
|
|
block.literal = re.sub(r'(\n *)+$', '', block.string_content) |
|
379
|
|
|
# allow GC |
|
380
|
|
|
block.string_content = None |
|
381
|
|
|
|
|
382
|
|
|
@staticmethod |
|
383
|
|
|
def can_contain(t): |
|
384
|
|
|
return False |
|
385
|
|
|
|
|
386
|
|
|
|
|
387
|
|
|
class Paragraph(Block): |
|
388
|
|
|
accepts_lines = True |
|
389
|
|
|
|
|
390
|
|
|
@staticmethod |
|
391
|
|
|
def continue_(parser=None, container=None): |
|
392
|
|
|
return 1 if parser.blank else 0 |
|
393
|
|
|
|
|
394
|
|
|
@staticmethod |
|
395
|
|
|
def finalize(parser=None, block=None): |
|
396
|
|
|
has_reference_defs = False |
|
397
|
|
|
|
|
398
|
|
|
# try parsing the beginning as link reference definitions: |
|
399
|
|
|
while peek(block.string_content, 0) == '[': |
|
400
|
|
|
pos = parser.inline_parser.parseReference( |
|
401
|
|
|
block.string_content, parser.refmap) |
|
402
|
|
|
if not pos: |
|
403
|
|
|
break |
|
404
|
|
|
block.string_content = block.string_content[pos:] |
|
405
|
|
|
has_reference_defs = True |
|
406
|
|
|
if has_reference_defs and is_blank(block.string_content): |
|
407
|
|
|
block.unlink() |
|
408
|
|
|
|
|
409
|
|
|
@staticmethod |
|
410
|
|
|
def can_contain(t): |
|
411
|
|
|
return False |
|
412
|
|
|
|
|
413
|
|
|
|
|
414
|
|
|
class BlockStarts(object): |
|
415
|
|
|
"""Block start functions. |
|
416
|
|
|
|
|
417
|
|
|
Return values: |
|
418
|
|
|
0 = no match |
|
419
|
|
|
1 = matched container, keep going |
|
420
|
|
|
2 = matched leaf, no more block starts |
|
421
|
|
|
""" |
|
422
|
|
|
METHODS = [ |
|
423
|
|
|
'block_quote', |
|
424
|
|
|
'atx_heading', |
|
425
|
|
|
'fenced_code_block', |
|
426
|
|
|
'html_block', |
|
427
|
|
|
'setext_heading', |
|
428
|
|
|
'thematic_break', |
|
429
|
|
|
'list_item', |
|
430
|
|
|
'indented_code_block', |
|
431
|
|
|
] |
|
432
|
|
|
|
|
433
|
|
|
@staticmethod |
|
434
|
|
|
def block_quote(parser, container=None): |
|
435
|
|
|
if not parser.indented and \ |
|
436
|
|
|
peek(parser.current_line, parser.next_nonspace) == '>': |
|
437
|
|
|
parser.advance_next_nonspace() |
|
438
|
|
|
parser.advance_offset(1, False) |
|
439
|
|
|
# optional following space |
|
440
|
|
|
if is_space_or_tab(peek(parser.current_line, parser.offset)): |
|
441
|
|
|
parser.advance_offset(1, True) |
|
442
|
|
|
parser.close_unmatched_blocks() |
|
443
|
|
|
parser.add_child('block_quote', parser.next_nonspace) |
|
444
|
|
|
return 1 |
|
445
|
|
|
|
|
446
|
|
|
return 0 |
|
447
|
|
|
|
|
448
|
|
|
@staticmethod |
|
449
|
|
|
def atx_heading(parser, container=None): |
|
450
|
|
|
if not parser.indented: |
|
451
|
|
|
m = re.search(reATXHeadingMarker, |
|
452
|
|
|
parser.current_line[parser.next_nonspace:]) |
|
453
|
|
|
if m: |
|
454
|
|
|
parser.advance_next_nonspace() |
|
455
|
|
|
parser.advance_offset(len(m.group()), False) |
|
456
|
|
|
parser.close_unmatched_blocks() |
|
457
|
|
|
container = parser.add_child('heading', parser.next_nonspace) |
|
458
|
|
|
# number of #s |
|
459
|
|
|
container.level = len(m.group().strip()) |
|
460
|
|
|
# remove trailing ###s: |
|
461
|
|
|
container.string_content = re.sub( |
|
462
|
|
|
r'[ \t]+#+[ \t]*$', '', re.sub( |
|
463
|
|
|
r'^[ \t]*#+[ \t]*$', |
|
464
|
|
|
'', |
|
465
|
|
|
parser.current_line[parser.offset:])) |
|
466
|
|
|
parser.advance_offset( |
|
467
|
|
|
len(parser.current_line) - parser.offset, False) |
|
468
|
|
|
return 2 |
|
469
|
|
|
|
|
470
|
|
|
return 0 |
|
471
|
|
|
|
|
472
|
|
|
@staticmethod |
|
473
|
|
|
def fenced_code_block(parser, container=None): |
|
474
|
|
|
if not parser.indented: |
|
475
|
|
|
m = re.search( |
|
476
|
|
|
reCodeFence, |
|
477
|
|
|
parser.current_line[parser.next_nonspace:]) |
|
478
|
|
|
if m: |
|
479
|
|
|
fence_length = len(m.group()) |
|
480
|
|
|
parser.close_unmatched_blocks() |
|
481
|
|
|
container = parser.add_child( |
|
482
|
|
|
'code_block', parser.next_nonspace) |
|
483
|
|
|
container.is_fenced = True |
|
484
|
|
|
container.fence_length = fence_length |
|
485
|
|
|
container.fence_char = m.group()[0] |
|
486
|
|
|
container.fence_offset = parser.indent |
|
487
|
|
|
parser.advance_next_nonspace() |
|
488
|
|
|
parser.advance_offset(fence_length, False) |
|
489
|
|
|
return 2 |
|
490
|
|
|
|
|
491
|
|
|
return 0 |
|
492
|
|
|
|
|
493
|
|
|
@staticmethod |
|
494
|
|
|
def html_block(parser, container=None): |
|
495
|
|
|
if not parser.indented and \ |
|
496
|
|
|
peek(parser.current_line, parser.next_nonspace) == '<': |
|
497
|
|
|
s = parser.current_line[parser.next_nonspace:] |
|
498
|
|
|
|
|
499
|
|
|
for block_type in range(1, 8): |
|
500
|
|
|
if re.search(reHtmlBlockOpen[block_type], s) and \ |
|
501
|
|
|
(block_type < 7 or container.t != 'paragraph'): |
|
502
|
|
|
parser.close_unmatched_blocks() |
|
503
|
|
|
# We don't adjust parser.offset; |
|
504
|
|
|
# spaces are part of the HTML block: |
|
505
|
|
|
b = parser.add_child('html_block', parser.offset) |
|
506
|
|
|
b.html_block_type = block_type |
|
507
|
|
|
return 2 |
|
508
|
|
|
return 0 |
|
509
|
|
|
|
|
510
|
|
|
@staticmethod |
|
511
|
|
|
def setext_heading(parser, container=None): |
|
512
|
|
|
if not parser.indented and container.t == 'paragraph': |
|
513
|
|
|
m = re.search( |
|
514
|
|
|
reSetextHeadingLine, |
|
515
|
|
|
parser.current_line[parser.next_nonspace:]) |
|
516
|
|
|
if m: |
|
517
|
|
|
parser.close_unmatched_blocks() |
|
518
|
|
|
heading = Node('heading', container.sourcepos) |
|
519
|
|
|
heading.level = 1 if m.group()[0] == '=' else 2 |
|
520
|
|
|
heading.string_content = container.string_content |
|
521
|
|
|
container.insert_after(heading) |
|
522
|
|
|
container.unlink() |
|
523
|
|
|
parser.tip = heading |
|
524
|
|
|
parser.advance_offset( |
|
525
|
|
|
len(parser.current_line) - parser.offset, False) |
|
526
|
|
|
return 2 |
|
527
|
|
|
|
|
528
|
|
|
return 0 |
|
529
|
|
|
|
|
530
|
|
|
@staticmethod |
|
531
|
|
|
def thematic_break(parser, container=None): |
|
532
|
|
|
if not parser.indented and re.search( |
|
533
|
|
|
reThematicBreak, parser.current_line[parser.next_nonspace:]): |
|
534
|
|
|
parser.close_unmatched_blocks() |
|
535
|
|
|
parser.add_child('thematic_break', parser.next_nonspace) |
|
536
|
|
|
parser.advance_offset( |
|
537
|
|
|
len(parser.current_line) - parser.offset, False) |
|
538
|
|
|
return 2 |
|
539
|
|
|
return 0 |
|
540
|
|
|
|
|
541
|
|
|
@staticmethod |
|
542
|
|
|
def list_item(parser, container=None): |
|
543
|
|
|
if (not parser.indented or container.t == 'list'): |
|
544
|
|
|
data = parse_list_marker(parser, container) |
|
545
|
|
|
if data: |
|
546
|
|
|
parser.close_unmatched_blocks() |
|
547
|
|
|
|
|
548
|
|
|
# add the list if needed |
|
549
|
|
|
if parser.tip.t != 'list' or \ |
|
550
|
|
|
not lists_match(container.list_data, data): |
|
551
|
|
|
container = parser.add_child('list', parser.next_nonspace) |
|
552
|
|
|
container.list_data = data |
|
553
|
|
|
|
|
554
|
|
|
# add the list item |
|
555
|
|
|
container = parser.add_child('item', parser.next_nonspace) |
|
556
|
|
|
container.list_data = data |
|
557
|
|
|
return 1 |
|
558
|
|
|
|
|
559
|
|
|
return 0 |
|
560
|
|
|
|
|
561
|
|
|
@staticmethod |
|
562
|
|
|
def indented_code_block(parser, container=None): |
|
563
|
|
|
if parser.indented and \ |
|
564
|
|
|
parser.tip.t != 'paragraph' and \ |
|
565
|
|
|
not parser.blank: |
|
566
|
|
|
# indented code |
|
567
|
|
|
parser.advance_offset(CODE_INDENT, True) |
|
568
|
|
|
parser.close_unmatched_blocks() |
|
569
|
|
|
parser.add_child('code_block', parser.offset) |
|
570
|
|
|
return 2 |
|
571
|
|
|
|
|
572
|
|
|
return 0 |
|
573
|
|
|
|
|
574
|
|
|
|
|
575
|
|
|
class Parser(object): |
|
576
|
|
|
def __init__(self, options={}): |
|
577
|
|
|
self.doc = Node('document', [[1, 1], [0, 0]]) |
|
578
|
|
|
self.block_starts = BlockStarts() |
|
579
|
|
|
self.tip = self.doc |
|
580
|
|
|
self.oldtip = self.doc |
|
581
|
|
|
self.current_line = '' |
|
582
|
|
|
self.line_number = 0 |
|
583
|
|
|
self.offset = 0 |
|
584
|
|
|
self.column = 0 |
|
585
|
|
|
self.next_nonspace = 0 |
|
586
|
|
|
self.next_nonspace_column = 0 |
|
587
|
|
|
self.indent = 0 |
|
588
|
|
|
self.indented = False |
|
589
|
|
|
self.blank = False |
|
590
|
|
|
self.partially_consumed_tab = False |
|
591
|
|
|
self.all_closed = True |
|
592
|
|
|
self.last_matched_container = self.doc |
|
593
|
|
|
self.refmap = {} |
|
594
|
|
|
self.last_line_length = 0 |
|
595
|
|
|
self.inline_parser = InlineParser(options) |
|
596
|
|
|
self.options = options |
|
597
|
|
|
|
|
598
|
|
|
def add_line(self): |
|
599
|
|
|
""" Add a line to the block at the tip. We assume the tip |
|
600
|
|
|
can accept lines -- that check should be done before calling this.""" |
|
601
|
|
|
if self.partially_consumed_tab: |
|
602
|
|
|
# Skip over tab |
|
603
|
|
|
self.offset += 1 |
|
604
|
|
|
# Add space characters |
|
605
|
|
|
chars_to_tab = 4 - (self.column % 4) |
|
606
|
|
|
self.tip.string_content += (' ' * chars_to_tab) |
|
607
|
|
|
self.tip.string_content += (self.current_line[self.offset:] + '\n') |
|
608
|
|
|
|
|
609
|
|
|
def add_child(self, tag, offset): |
|
610
|
|
|
""" Add block of type tag as a child of the tip. If the tip can't |
|
611
|
|
|
accept children, close and finalize it and try its parent, |
|
612
|
|
|
and so on til we find a block that can accept children.""" |
|
613
|
|
|
block_class = getattr(import_module('CommonMark.blocks'), |
|
614
|
|
|
to_camel_case(self.tip.t)) |
|
615
|
|
|
while not block_class.can_contain(tag): |
|
616
|
|
|
self.finalize(self.tip, self.line_number - 1) |
|
617
|
|
|
block_class = getattr( |
|
618
|
|
|
import_module('CommonMark.blocks'), |
|
619
|
|
|
to_camel_case(self.tip.t)) |
|
620
|
|
|
|
|
621
|
|
|
column_number = offset + 1 |
|
622
|
|
|
new_block = Node(tag, [[self.line_number, column_number], [0, 0]]) |
|
623
|
|
|
new_block.string_content = '' |
|
624
|
|
|
self.tip.append_child(new_block) |
|
625
|
|
|
self.tip = new_block |
|
626
|
|
|
return new_block |
|
627
|
|
|
|
|
628
|
|
|
def close_unmatched_blocks(self): |
|
629
|
|
|
"""Finalize and close any unmatched blocks.""" |
|
630
|
|
|
if not self.all_closed: |
|
631
|
|
|
while self.oldtip != self.last_matched_container: |
|
632
|
|
|
parent = self.oldtip.parent |
|
633
|
|
|
self.finalize(self.oldtip, self.line_number - 1) |
|
634
|
|
|
self.oldtip = parent |
|
635
|
|
|
self.all_closed = True |
|
636
|
|
|
|
|
637
|
|
|
def find_next_nonspace(self): |
|
638
|
|
|
current_line = self.current_line |
|
639
|
|
|
i = self.offset |
|
640
|
|
|
cols = self.column |
|
641
|
|
|
|
|
642
|
|
|
try: |
|
643
|
|
|
c = current_line[i] |
|
644
|
|
|
except IndexError: |
|
645
|
|
|
c = '' |
|
646
|
|
|
while c != '': |
|
647
|
|
|
if c == ' ': |
|
648
|
|
|
i += 1 |
|
649
|
|
|
cols += 1 |
|
650
|
|
|
elif c == '\t': |
|
651
|
|
|
i += 1 |
|
652
|
|
|
cols += (4 - (cols % 4)) |
|
653
|
|
|
else: |
|
654
|
|
|
break |
|
655
|
|
|
|
|
656
|
|
|
try: |
|
657
|
|
|
c = current_line[i] |
|
658
|
|
|
except IndexError: |
|
659
|
|
|
c = '' |
|
660
|
|
|
|
|
661
|
|
|
self.blank = (c == '\n' or c == '\r' or c == '') |
|
662
|
|
|
self.next_nonspace = i |
|
663
|
|
|
self.next_nonspace_column = cols |
|
664
|
|
|
self.indent = self.next_nonspace_column - self.column |
|
665
|
|
|
self.indented = self.indent >= CODE_INDENT |
|
666
|
|
|
|
|
667
|
|
|
def advance_next_nonspace(self): |
|
668
|
|
|
self.offset = self.next_nonspace |
|
669
|
|
|
self.column = self.next_nonspace_column |
|
670
|
|
|
self.partially_consumed_tab = False |
|
671
|
|
|
|
|
672
|
|
|
def advance_offset(self, count, columns): |
|
673
|
|
|
current_line = self.current_line |
|
674
|
|
|
try: |
|
675
|
|
|
c = current_line[self.offset] |
|
676
|
|
|
except IndexError: |
|
677
|
|
|
c = None |
|
678
|
|
|
while count > 0 and c is not None: |
|
679
|
|
|
if c == '\t': |
|
680
|
|
|
chars_to_tab = 4 - (self.column % 4) |
|
681
|
|
|
if columns: |
|
682
|
|
|
self.partially_consumed_tab = chars_to_tab > count |
|
683
|
|
|
chars_to_advance = min(count, chars_to_tab) |
|
684
|
|
|
self.column += chars_to_advance |
|
685
|
|
|
self.offset += 0 if self.partially_consumed_tab else 1 |
|
686
|
|
|
count -= chars_to_advance |
|
687
|
|
|
else: |
|
688
|
|
|
self.partially_consumed_tab = False |
|
689
|
|
|
self.column += chars_to_tab |
|
690
|
|
|
self.offset += 1 |
|
691
|
|
|
count -= 1 |
|
692
|
|
|
else: |
|
693
|
|
|
self.partially_consumed_tab = False |
|
694
|
|
|
self.offset += 1 |
|
695
|
|
|
# assume ascii; block starts are ascii |
|
696
|
|
|
self.column += 1 |
|
697
|
|
|
count -= 1 |
|
698
|
|
|
try: |
|
699
|
|
|
c = current_line[self.offset] |
|
700
|
|
|
except IndexError: |
|
701
|
|
|
c = None |
|
702
|
|
|
|
|
703
|
|
|
def incorporate_line(self, ln): |
|
704
|
|
|
"""Analyze a line of text and update the document appropriately. |
|
705
|
|
|
|
|
706
|
|
|
We parse markdown text by calling this on each line of input, |
|
707
|
|
|
then finalizing the document. |
|
708
|
|
|
""" |
|
709
|
|
|
all_matched = True |
|
710
|
|
|
|
|
711
|
|
|
container = self.doc |
|
712
|
|
|
self.oldtip = self.tip |
|
713
|
|
|
self.offset = 0 |
|
714
|
|
|
self.column = 0 |
|
715
|
|
|
self.blank = False |
|
716
|
|
|
self.partially_consumed_tab = False |
|
717
|
|
|
self.line_number += 1 |
|
718
|
|
|
|
|
719
|
|
|
# replace NUL characters for security |
|
720
|
|
|
if re.search(r'\u0000', ln) is not None: |
|
721
|
|
|
ln = re.sub(r'\0', '\uFFFD', ln) |
|
722
|
|
|
|
|
723
|
|
|
self.current_line = ln |
|
724
|
|
|
|
|
725
|
|
|
# For each containing block, try to parse the associated line start. |
|
726
|
|
|
# Bail out on failure: container will point to the last matching block. |
|
727
|
|
|
# Set all_matched to false if not all containers match. |
|
728
|
|
|
last_child = container.last_child |
|
729
|
|
|
while last_child and last_child.is_open: |
|
730
|
|
|
container = last_child |
|
731
|
|
|
|
|
732
|
|
|
self.find_next_nonspace() |
|
733
|
|
|
block_class = getattr( |
|
734
|
|
|
import_module('CommonMark.blocks'), |
|
735
|
|
|
to_camel_case(container.t)) |
|
736
|
|
|
rv = block_class.continue_(self, container) |
|
737
|
|
|
if rv == 0: |
|
738
|
|
|
# we've matched, keep going |
|
739
|
|
|
pass |
|
740
|
|
|
elif rv == 1: |
|
741
|
|
|
# we've failed to match a block |
|
742
|
|
|
all_matched = False |
|
743
|
|
|
elif rv == 2: |
|
744
|
|
|
# we've hit end of line for fenced code close and can return |
|
745
|
|
|
self.last_line_length = len(ln) |
|
746
|
|
|
return |
|
747
|
|
|
else: |
|
748
|
|
|
raise ValueError('returned illegal value, must be 0, 1, or 2') |
|
749
|
|
|
|
|
750
|
|
|
if not all_matched: |
|
751
|
|
|
# back up to last matching block |
|
752
|
|
|
container = container.parent |
|
753
|
|
|
break |
|
754
|
|
|
|
|
755
|
|
|
last_child = container.last_child |
|
756
|
|
|
|
|
757
|
|
|
self.all_closed = (container == self.oldtip) |
|
758
|
|
|
self.last_matched_container = container |
|
759
|
|
|
|
|
760
|
|
|
block_class = getattr(import_module('CommonMark.blocks'), |
|
761
|
|
|
to_camel_case(container.t)) |
|
762
|
|
|
matched_leaf = container.t != 'paragraph' and block_class.accepts_lines |
|
763
|
|
|
starts = self.block_starts |
|
764
|
|
|
starts_len = len(starts.METHODS) |
|
765
|
|
|
# Unless last matched container is a code block, try new container |
|
766
|
|
|
# starts, adding children to the last matched container: |
|
767
|
|
|
while not matched_leaf: |
|
768
|
|
|
self.find_next_nonspace() |
|
769
|
|
|
|
|
770
|
|
|
# this is a little performance optimization: |
|
771
|
|
|
if not self.indented and \ |
|
772
|
|
|
not re.search(reMaybeSpecial, ln[self.next_nonspace:]): |
|
773
|
|
|
self.advance_next_nonspace() |
|
774
|
|
|
break |
|
775
|
|
|
|
|
776
|
|
|
i = 0 |
|
777
|
|
|
while i < starts_len: |
|
778
|
|
|
res = getattr(starts, starts.METHODS[i])(self, container) |
|
779
|
|
|
if res == 1: |
|
780
|
|
|
container = self.tip |
|
781
|
|
|
break |
|
782
|
|
|
elif res == 2: |
|
783
|
|
|
container = self.tip |
|
784
|
|
|
matched_leaf = True |
|
785
|
|
|
break |
|
786
|
|
|
else: |
|
787
|
|
|
i += 1 |
|
788
|
|
|
|
|
789
|
|
|
if i == starts_len: |
|
790
|
|
|
# nothing matched |
|
791
|
|
|
self.advance_next_nonspace() |
|
792
|
|
|
break |
|
793
|
|
|
|
|
794
|
|
|
# What remains at the offset is a text line. Add the text to the |
|
795
|
|
|
# appropriate container. |
|
796
|
|
|
if not self.all_closed and not self.blank and \ |
|
797
|
|
|
self.tip.t == 'paragraph': |
|
798
|
|
|
# lazy paragraph continuation |
|
799
|
|
|
self.add_line() |
|
800
|
|
|
else: |
|
801
|
|
|
# not a lazy continuation |
|
802
|
|
|
# finalize any blocks not matched |
|
803
|
|
|
self.close_unmatched_blocks() |
|
804
|
|
|
if self.blank and container.last_child: |
|
805
|
|
|
container.last_child.last_line_blank = True |
|
806
|
|
|
|
|
807
|
|
|
t = container.t |
|
808
|
|
|
|
|
809
|
|
|
# Block quote lines are never blank as they start with > |
|
810
|
|
|
# and we don't count blanks in fenced code for purposes of |
|
811
|
|
|
# tight/loose lists or breaking out of lists. We also |
|
812
|
|
|
# don't set last_line_blank on an empty list item, or if we |
|
813
|
|
|
# just closed a fenced block. |
|
814
|
|
|
last_line_blank = self.blank and \ |
|
815
|
|
|
not (t == 'block_quote' or |
|
816
|
|
|
(t == 'code_block' and container.is_fenced) or |
|
817
|
|
|
(t == 'item' and |
|
818
|
|
|
not container.first_child and |
|
819
|
|
|
container.sourcepos[0][0] == self.line_number)) |
|
820
|
|
|
|
|
821
|
|
|
# propagate last_line_blank up through parents: |
|
822
|
|
|
cont = container |
|
823
|
|
|
while cont: |
|
824
|
|
|
cont.last_line_blank = last_line_blank |
|
825
|
|
|
cont = cont.parent |
|
826
|
|
|
|
|
827
|
|
|
block_class = getattr(import_module('CommonMark.blocks'), |
|
828
|
|
|
to_camel_case(t)) |
|
829
|
|
|
if block_class.accepts_lines: |
|
830
|
|
|
self.add_line() |
|
831
|
|
|
# if HtmlBlock, check for end condition |
|
832
|
|
|
if t == 'html_block' and \ |
|
833
|
|
|
container.html_block_type >= 1 and \ |
|
834
|
|
|
container.html_block_type <= 5 and \ |
|
835
|
|
|
re.search( |
|
836
|
|
|
reHtmlBlockClose[container.html_block_type], |
|
837
|
|
|
self.current_line[self.offset:]): |
|
838
|
|
|
self.finalize(container, self.line_number) |
|
839
|
|
|
elif self.offset < len(ln) and not self.blank: |
|
840
|
|
|
# create a paragraph container for one line |
|
841
|
|
|
container = self.add_child('paragraph', self.offset) |
|
842
|
|
|
self.advance_next_nonspace() |
|
843
|
|
|
self.add_line() |
|
844
|
|
|
|
|
845
|
|
|
self.last_line_length = len(ln) |
|
846
|
|
|
|
|
847
|
|
|
def finalize(self, block, line_number): |
|
848
|
|
|
""" Finalize a block. Close it and do any necessary postprocessing, |
|
849
|
|
|
e.g. creating string_content from strings, setting the 'tight' |
|
850
|
|
|
or 'loose' status of a list, and parsing the beginnings |
|
851
|
|
|
of paragraphs for reference definitions. Reset the tip to the |
|
852
|
|
|
parent of the closed block.""" |
|
853
|
|
|
above = block.parent |
|
854
|
|
|
block.is_open = False |
|
855
|
|
|
block.sourcepos[1] = [line_number, self.last_line_length] |
|
856
|
|
|
block_class = getattr(import_module('CommonMark.blocks'), |
|
857
|
|
|
to_camel_case(block.t)) |
|
858
|
|
|
block_class.finalize(self, block) |
|
859
|
|
|
|
|
860
|
|
|
self.tip = above |
|
861
|
|
|
|
|
862
|
|
|
def process_inlines(self, block): |
|
863
|
|
|
""" |
|
864
|
|
|
Walk through a block & children recursively, parsing string content |
|
865
|
|
|
into inline content where appropriate. |
|
866
|
|
|
""" |
|
867
|
|
|
walker = block.walker() |
|
868
|
|
|
self.inline_parser.refmap = self.refmap |
|
869
|
|
|
self.inline_parser.options = self.options |
|
870
|
|
|
event = walker.nxt() |
|
871
|
|
|
while event is not None: |
|
872
|
|
|
node = event['node'] |
|
873
|
|
|
t = node.t |
|
874
|
|
|
if not event['entering'] and (t == 'paragraph' or t == 'heading'): |
|
875
|
|
|
self.inline_parser.parse(node) |
|
876
|
|
|
event = walker.nxt() |
|
877
|
|
|
|
|
878
|
|
|
def parse(self, my_input): |
|
879
|
|
|
""" The main parsing function. Returns a parsed document AST.""" |
|
880
|
|
|
self.doc = Node('document', [[1, 1], [0, 0]]) |
|
881
|
|
|
self.tip = self.doc |
|
882
|
|
|
self.refmap = {} |
|
883
|
|
|
self.line_number = 0 |
|
884
|
|
|
self.last_line_length = 0 |
|
885
|
|
|
self.offset = 0 |
|
886
|
|
|
self.column = 0 |
|
887
|
|
|
self.last_matched_container = self.doc |
|
888
|
|
|
self.current_line = '' |
|
889
|
|
|
lines = re.split(reLineEnding, my_input) |
|
890
|
|
|
length = len(lines) |
|
891
|
|
|
if len(my_input) > 0 and my_input[-1] == '\n': |
|
892
|
|
|
# ignore last blank line created by final newline |
|
893
|
|
|
length -= 1 |
|
894
|
|
|
for i in range(length): |
|
895
|
|
|
self.incorporate_line(lines[i]) |
|
896
|
|
|
while (self.tip): |
|
897
|
|
|
self.finalize(self.tip, length) |
|
898
|
|
|
self.process_inlines(self.doc) |
|
899
|
|
|
return self.doc |
|
900
|
|
|
|
MikeCoder /
markdown-preview.vim
