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