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|
import dataclasses
import re
import typing
def parse(s):
"""
>>> parse('''# Header 1
...
... ## Header 2
...
... ### Header 3
...
... * List 1
... * List 2
...
... > First line quote.
... > Second line of quote.
...
... ```
... Fenced
... Lines
... ```
...
... Paragraph.
...
... Another paragraph.
... ''')
[Header(level=1, text='Header 1'),
Line(text=''),
Header(level=2, text='Header 2'),
Line(text=''),
Header(level=3, text='Header 3'),
Line(text=''),
List(items=[ListItem(text='List 1'),
ListItem(text='List 2')]),
Line(text=''),
BlockQuote(lines=[BlockQuoteLine(text='First line quote.'),
BlockQuoteLine(text='Second line of quote.')]),
Line(text=''),
Pre(content='Fenced\\nLines\\n'),
Line(text=''),
Line(text='Paragraph.'),
Line(text=''),
Line(text='Another paragraph.')]
"""
lines = s.splitlines()
i = 0
gem = []
while i < len(lines):
line = parse_line(lines[i])
if isinstance(line, Link):
gem.append(line)
i = i + 1
continue
if isinstance(line, Header):
gem.append(line)
i = i + 1
continue
if isinstance(line, ListItem):
items = []
while i < len(lines) and isinstance(parse_line(lines[i]), ListItem):
items.append(parse_line(lines[i]))
i = i + 1
gem.append(List(items))
continue
if isinstance(line, BlockQuoteLine):
quotes = []
while i < len(lines) and isinstance(parse_line(lines[i]), BlockQuoteLine):
quotes.append(parse_line(lines[i]))
i = i + 1
gem.append(BlockQuote(quotes))
continue
if isinstance(line, PreFence):
content = ""
i = i + 1
while i < len(lines) and not isinstance(parse_line(lines[i]), PreFence):
content += lines[i]
content += "\n"
i = i + 1
gem.append(Pre(content))
i = i + 1
continue
gem.append(line)
i = i + 1
return gem
def parse_line(l):
if Link.is_link(l):
return Link(l)
if Header.is_header(l):
return Header(l)
if ListItem.is_list_item(l):
return ListItem(l)
if BlockQuoteLine.is_block_quote_line(l):
return BlockQuoteLine(l)
if PreFence.is_pre_fence(l):
return PreFence()
return Line(l)
@dataclasses.dataclass
class Link:
"""
>>> Link("=> http://example.com")
Link(url='http://example.com', text=None)
>>> Link("=> http://example.com Example text")
Link(url='http://example.com', text='Example text')
"""
url: str
text: typing.Optional[str]
def __init__(self, line: str):
assert Link.is_link(line)
parts = line.split(None, 2)
self.url = parts[1]
self.text = parts[2] if len(parts) > 2 else None
@staticmethod
def is_link(line: str):
return line.startswith("=>")
@dataclasses.dataclass
class Header:
"""
>>> Header("# Level one")
Header(level=1, text='Level one')
>>> Header("## Level two")
Header(level=2, text='Level two')
>>> Header("### Level three")
Header(level=3, text='Level three')
"""
level: int
text: str
def __init__(self, line: str):
assert Header.is_header(line)
hashes, self.text = line.split(None, 1)
self.level = len(hashes)
@staticmethod
def is_header(line: str):
return re.match("#{1,3} .*", line)
@dataclasses.dataclass
class ListItem:
"""
>>> ListItem("* foo")
ListItem(text='foo')
"""
text: str
def __init__(self, line: str):
assert ListItem.is_list_item(line)
self.text = line[2:]
@staticmethod
def is_list_item(line: str):
return line.startswith("* ")
@dataclasses.dataclass
class BlockQuoteLine:
"""
>>> BlockQuoteLine("> foo")
BlockQuoteLine(text='foo')
>>> BlockQuoteLine(">foo")
BlockQuoteLine(text='foo')
"""
text: str
def __init__(self, line: str):
assert BlockQuoteLine.is_block_quote_line(line)
self.text = line[2:] if line.startswith("> ") else line[1:]
@staticmethod
def is_block_quote_line(line: str):
return line.startswith(">")
class PreFence:
@staticmethod
def is_pre_fence(line: str):
return line == "```"
@dataclasses.dataclass
class Line:
text: str
@dataclasses.dataclass
class List:
items: typing.List[ListItem]
@dataclasses.dataclass
class BlockQuote:
lines: typing.List[BlockQuoteLine]
@dataclasses.dataclass
class Pre:
content: str
|
