forked from anton/matekasse
82 lines
2.4 KiB
Python
82 lines
2.4 KiB
Python
from __future__ import annotations
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from .exceptions import ParseError
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from typing import NamedTuple
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COMMENTCHARS = "#;"
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class _ParsedLine(NamedTuple):
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lineno: int
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section: str | None
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name: str | None
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value: str | None
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def parse_lines(path: str, line_iter: list[str]) -> list[_ParsedLine]:
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result: list[_ParsedLine] = []
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section = None
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for lineno, line in enumerate(line_iter):
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name, data = _parseline(path, line, lineno)
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# new value
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if name is not None and data is not None:
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result.append(_ParsedLine(lineno, section, name, data))
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# new section
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elif name is not None and data is None:
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if not name:
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raise ParseError(path, lineno, "empty section name")
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section = name
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result.append(_ParsedLine(lineno, section, None, None))
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# continuation
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elif name is None and data is not None:
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if not result:
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raise ParseError(path, lineno, "unexpected value continuation")
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last = result.pop()
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if last.name is None:
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raise ParseError(path, lineno, "unexpected value continuation")
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if last.value:
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last = last._replace(value=f"{last.value}\n{data}")
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else:
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last = last._replace(value=data)
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result.append(last)
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return result
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def _parseline(path: str, line: str, lineno: int) -> tuple[str | None, str | None]:
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# blank lines
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if iscommentline(line):
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line = ""
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else:
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line = line.rstrip()
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if not line:
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return None, None
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# section
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if line[0] == "[":
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realline = line
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for c in COMMENTCHARS:
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line = line.split(c)[0].rstrip()
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if line[-1] == "]":
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return line[1:-1], None
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return None, realline.strip()
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# value
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elif not line[0].isspace():
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try:
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name, value = line.split("=", 1)
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if ":" in name:
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raise ValueError()
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except ValueError:
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try:
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name, value = line.split(":", 1)
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except ValueError:
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raise ParseError(path, lineno, "unexpected line: %r" % line)
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return name.strip(), value.strip()
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# continuation
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else:
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return None, line.strip()
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def iscommentline(line: str) -> bool:
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c = line.lstrip()[:1]
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return c in COMMENTCHARS
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