def parse_expr(txt: str, version: Optional[str] = None) -> E.Base:
try:
return _ExprTransformer(txt).transform(parse(txt, "expr", version))
except lark.exceptions.UnexpectedInput as exn:
pos = SourcePosition(
filename="(buffer)",
line=getattr(exn, "line", "?"),
column=getattr(exn, "column", "?"),
end_line=getattr(exn, "line", "?"),
end_column=getattr(exn, "column", "?"),
)
raise Err.SyntaxError(pos, str(exn)) from None
except lark.exceptions.VisitError as exn:
raise exn.__context__
def parse_document(txt: str,
version: Optional[str] = None,
uri: str = "") -> D.Document:
if version is None:
# for now assume the version is 1.0 if the first line is "version <number>"
# otherwise draft-2
version = "draft-2"
for line in txt.split("\n"):
line = line.strip()
if line and line[0] != "#":
if line.startswith("version ") and line[8].isdigit():
version = "1.0"
break
if not txt.strip():
return D.Document(
SourcePosition(filename=uri,
line=0,
column=0,
end_line=0,
end_column=0),
[],
{},
[],
None,
)
try:
return _DocTransformer(uri).transform(parse(txt, "document", version))
except lark.exceptions.UnexpectedInput as exn:
pos = SourcePosition(
filename=(uri if uri != "" else "(buffer)"),
line=getattr(exn, "line", "?"),
column=getattr(exn, "column", "?"),
end_line=getattr(exn, "line", "?"),
end_column=getattr(exn, "column", "?"),
)
raise Err.SyntaxError(pos, str(exn)) from None
except lark.exceptions.VisitError as exn:
raise exn.__context__
def _check_keyword(pos, name):
if name in _keywords:
raise Err.SyntaxError(pos, "unexpected keyword {}".format(name))
