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import dataclasses
from collections import abc
import typing
type GemElement = PreformattingToggleLine | PreformattedTextLine | LinkLine | ListItem | QuoteLine | HeadingLine | TextLine
def _test(gemtext: str):
return list(parse(gemtext.lstrip()))
def parse(gemtext: str) -> abc.Generator[GemElement]:
"""
>>> _test('''
... This is a test.
... ''')
[TextLine(text='This is a test.')]
>>> _test('''
... This is a test.
...
... => https://www.example.com/ Link
... ''')
[TextLine(text='This is a test.'), TextLine(text=''), LinkLine(url='https://www.example.com/', link_name='Link')]
>>> _test('''
... This is a test
...
... ```foo
... bar
... ```
... ''')
[TextLine(text='This is a test'), TextLine(text=''), PreformattingToggleLine(alt_text='foo'), PreformattedTextLine(text='bar'), PreformattingToggleLine(alt_text=None)]
>>> _test('''
... # Welcome
...
... Something.
... ''')
[HeadingLine(level=1, heading_text='Welcome'), TextLine(text=''), TextLine(text='Something.')]
>>> _test('''
... This is a test.
...
... * Item 1
... * Item 2
... ''')
[TextLine(text='This is a test.'), TextLine(text=''), ListItem(text='Item 1'), ListItem(text='Item 2')]
>>> _test('''
... This is a test.
...
... > Line 1
... > Line 2
... ''')
[TextLine(text='This is a test.'), TextLine(text=''), QuoteLine(text='Line 1'), QuoteLine(text='Line 2')]
"""
current_preformatting_toggle_line = None
for line in gemtext.splitlines():
preformatting_toggle_line = PreformattingToggleLine.parse(line)
if current_preformatting_toggle_line:
if preformatting_toggle_line:
assert not preformatting_toggle_line.alt_text, 'closing preformatting toggle line with alt text {preformatting_toggle_line.alt_text}'
current_preformatting_toggle_line = None
yield preformatting_toggle_line
continue
else:
yield PreformattedTextLine(line)
continue
if preformatting_toggle_line:
current_preformatting_toggle_line = preformatting_toggle_line
yield preformatting_toggle_line
continue
elif current_preformatting_toggle_line and not preformatting_toggle_line:
current_preformatting_toggle_line = None
link_line = LinkLine.parse(line)
if link_line:
yield link_line
continue
list_item = ListItem.parse(line)
if list_item:
yield list_item
continue
quote_line = QuoteLine.parse(line)
if quote_line:
yield quote_line
continue
heading_line = HeadingLine.parse(line)
if heading_line:
yield heading_line
continue
yield TextLine(line)
@dataclasses.dataclass
class TextLine:
text: str
@dataclasses.dataclass
class PreformattedTextLine(TextLine):
pass
@dataclasses.dataclass
class LinkLine:
url: str
link_name: typing.Optional[str] = None
@staticmethod
def parse(line: str):
"""
>>> LinkLine.parse('Not a link line')
>>> LinkLine.parse('=>foo')
LinkLine(url='foo', link_name=None)
>>> LinkLine.parse('=> foo')
LinkLine(url='foo', link_name=None)
>>> LinkLine.parse('=> foo bar')
LinkLine(url='foo', link_name='bar')
"""
if not line.startswith('=>'):
return None
line = line.removeprefix('=>')
line = line.lstrip()
parts = line.split(maxsplit=1)
assert len(parts) in (1,2)
if len(parts) == 1:
return LinkLine(parts[0])
return LinkLine(parts[0], parts[1])
@dataclasses.dataclass
class PreformattingToggleLine:
alt_text: typing.Optional[str]
@staticmethod
def parse(line: str):
"""
>>> PreformattingToggleLine.parse('Not a preformatting toggle line')
>>> PreformattingToggleLine.parse('```')
PreformattingToggleLine(alt_text=None)
>>> PreformattingToggleLine.parse('```alt')
PreformattingToggleLine(alt_text='alt')
"""
if not line.startswith('```'):
return None
line = line.removeprefix('```')
line: typing.Optional[str] = line if line else None
return PreformattingToggleLine(line)
@dataclasses.dataclass
class HeadingLine:
level: int
heading_text: str
@staticmethod
def parse(line: str):
"""
>>> HeadingLine.parse('Not a heading line')
>>> HeadingLine.parse('# Foo')
HeadingLine(level=1, heading_text='Foo')
"""
parts = line.split(maxsplit=1)
if len(parts) < 2:
return None
if not parts[0] in ('#', '##', '###'):
return None
return HeadingLine(len(parts[0]), parts[1])
@dataclasses.dataclass
class ListItem:
text: str
@staticmethod
def parse(line: str):
"""
>>> ListItem.parse('Not a list item')
>>> ListItem.parse('* Foo')
ListItem(text='Foo')
"""
if not line.startswith("* "):
return None
return ListItem(line.removeprefix("* "))
@dataclasses.dataclass
class QuoteLine:
text: str
@staticmethod
def parse(line: str):
"""
>>> QuoteLine.parse('Not a quote line')
>>> QuoteLine.parse('> Foo')
QuoteLine(text='Foo')
"""
if not line.startswith("> "):
return None
return QuoteLine(line.removeprefix("> "))
def cli_parse():
import json, sys
def dataclass_json(obj):
assert dataclasses.is_dataclass(obj)
d = dataclasses.asdict(obj)
d["type"] = type(obj).__name__
return d
input_ = sys.stdin.read()
gemtext = parse(input_)
as_json = json.dumps(list(gemtext), default=dataclass_json)
print(as_json)
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