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99 lines
2.2 KiB
99 lines
2.2 KiB
"""Gemtext parser.
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To allow a flexible rendering of the content, the parser produces a list of
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"elements", each being an instance of one of the dataclasses defined in this
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module. A renderer can then completely abstract the original document.
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"""
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import re
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import typing
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from dataclasses import dataclass
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@dataclass
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class Paragraph:
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text: str
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@dataclass
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class Title:
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level: int
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text: str
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RE = re.compile(r"(#{1,3})\s+(.+)")
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@dataclass
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class Link:
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url: str
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text: str
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RE = re.compile(r"=>\s*(?P<url>\S+)(\s+(?P<text>.+))?")
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@dataclass
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class Preformatted:
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lines: typing.List[str]
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FENCE = "```"
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@dataclass
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class Blockquote:
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text: str
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RE = re.compile(r">\s*(.*)")
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@dataclass
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class ListItem:
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text: str
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RE = re.compile(r"\*\s(.*)")
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def parse_gemtext(data):
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"""Parse UTF-8 encoded Gemtext as a list of elements."""
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text = data.decode(encoding="utf8", errors="ignore")
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elements = []
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preformatted = None
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for line in text.splitlines():
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line = line.rstrip()
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if not line:
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continue
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match = Title.RE.match(line)
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if match:
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hashtags, text = match.groups()
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elements.append(Title(hashtags.count("#"), text))
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continue
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match = Link.RE.match(line)
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if match:
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match_dict = match.groupdict()
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url, text = match_dict["url"], match_dict.get("text", "")
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elements.append(Link(url, text))
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continue
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if line.startswith(Preformatted.FENCE):
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if preformatted:
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elements.append(preformatted)
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preformatted = None
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else:
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preformatted = Preformatted([])
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continue
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match = Blockquote.RE.match(line)
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if match:
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text = match.groups()[0]
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elements.append(Blockquote(text))
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continue
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match = ListItem.RE.match(line)
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if match:
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text = match.groups()[0]
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elements.append(ListItem(text))
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continue
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if preformatted:
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preformatted.lines.append(line)
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else:
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elements.append(Paragraph(line))
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return elements
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