def _set_link(self, link):
if link is not None:
if self._alwaysfrozen:
raise ParameterErr('frozennolink', self.fullname)
if not isinstance(link, Parameter):
raise ParameterErr('notlink')
# Short cycles produce error
# e.g. par = 2*par+3
if self in link:
raise ParameterErr('linkcycle')
# Correctly test for link cycles in long trees.
cycle = False
ll = link
while isinstance(ll, Parameter):
if ll == self or self in ll:
cycle = True
ll = ll.link
# Long cycles are overwritten BUG #12287
if cycle and isinstance(link, Parameter):
link.link = None
self._link = link
def _set_limit(self, val):
val = SherpaFloat(val)
# Ensure that we don't try to set any value that is outside
# the hard parameter limits.
if val < self._hard_min:
raise ParameterErr('edge', self.fullname,
'hard minimum', self._hard_min)
if val > self._hard_max:
raise ParameterErr('edge', self.fullname,
'hard maximum', self._hard_max)
# Ensure that we don't try to set a parameter range, such that
# the minimum will be greater than the current parameter value,
# or that the maximum will be less than the current parameter value.
# But we only want to do this check *after* parameter has been
# created and fully initialized; we are doing this check some time
# *later*, when the user is trying to reset a parameter range
# such that the new range will leave the current value
# *outside* the new range. We want to warn against and disallow that.
# Due to complaints about having to rewrite existing user scripts,
# downgrade the ParameterErr issued here to mere warnings. Also,
# set the value to the appropriate soft limit.
if hasattr(self, "_NoNewAttributesAfterInit__initialized") and \
self._NoNewAttributesAfterInit__initialized:
if name == "_min" and (val > self.val):
self.val = val
warning(('parameter %s less than new minimum; %s reset to %g') % (self.fullname, self.fullname, self.val))
if name == "_max" and (val < self.val):
self.val = val
warning(('parameter %s greater than new maximum; %s reset to %g') % (self.fullname, self.fullname, self.val))
setattr(self, name, val)
def _get_val(self):
if hasattr(self, 'eval'):
return self.eval()
if self.link is None:
return self._val
val = self.link.val
if val < self.min:
raise ParameterErr('edge', self.fullname, 'minimum', self.min)
if val > self.max:
raise ParameterErr('edge', self.fullname, 'maximum', self.max)
return val
def _set_default_val(self, default_val):
if isinstance(default_val, Parameter):
self.link = default_val
else:
# Reset link
self.link = None
# Validate new value
default_val = SherpaFloat(default_val)
if default_val < self.min:
raise ParameterErr('edge', self.fullname, 'minimum', self.min)
if default_val > self.max:
raise ParameterErr('edge', self.fullname, 'maximum', self.max)
self._default_val = default_val
def _set_frozen(self, val):
val = bool(val)
if self._alwaysfrozen and (not val):
raise ParameterErr('alwaysfrozen', self.fullname)
self._frozen = val