def _format_value(self, context, element, value) -> "str or None":
"""Format value in FDS notation for me. On error raise BFException."""
# Expected output:
# ID='example' or PI=3.14 or COLOR=3,4,5
# Free parameters (no self.fds_label) needs special treatment in fds.props or fds.props_geometry
if value is None: return None
# If value is not an iterable, then put it in a tuple
if not isiterable(value): values = tuple((value,))
else: values = value
# Check first element of the iterable and choose formatting
if isinstance(values[0], bool): value = ",".join(value and ".TRUE." or ".FALSE." for value in values)
elif isinstance(values[0], int): value = ",".join(str(value) for value in values)
elif isinstance(values[0], float): value = ",".join("{:.{}f}".format(value, self.precision) for value in values)
else: value = ",".join("'{}'".format(value) for value in values)
return "=".join((self.fds_label, value))
def _format(self, context, element, my_res, children_res) -> "str or None":
"""Format to FDS notation. On error raise BFException."""
# Expected output:
# ! OBST: Message < my_res.labels
# ! OBST: ID: Message + children labels (from self.bf_props)
# ! OBST: XB: Message
# &OBST ID='example' XB=... /\n < body < c_multivalue[0] + c_value
# &OBST ID='example' XB=... /\n c_multivalue[1] + c_value
# &XXXX P1=... /\n < my_res.value
# Append children messages to my messages (children are self.bf_props)
my_res.msgs.extend(label for child_res in children_res for label in child_res.labels)
# Search and extract the first (and should be only) multivalue from children values
child_multivalues = None
for child_res in children_res:
if isiterable(child_res.value):
# Set the multivalue and remove multivalue child_res from single value children_res
child_multivalues = child_res.value
children_res.remove(child_res)
# Each multivalue contains its multi ID, then remove ordinary single ID sent by "bf_id"
children_res.remove(children_res["bf_id"])
break
# Set fds_label: use self.fds_label or last children_res value, that should be bf_free
# When using last children value, remove child from BFList
if self.fds_label: fds_label = self.fds_label
else: fds_label = children_res.pop().value
# Join children values
children_value = " ".join(child_res.value for child_res in children_res if child_res.value)
# Build body: When multivalue exists, ID is embedded into each child_multivalue;
# else ID is embedded into children_value
if child_multivalues: body = "".join("&{} {} {} /\n".format(
fds_label, child_multivalue, children_value,
) for child_multivalue in child_multivalues
)
else: body = "&{} {} /\n".format(fds_label, children_value)
# Return
return "".join((
fds_format.to_comment(my_res.labels),
body,
my_res.value or str(), # my_res.value could be None
))
