def onAddCurveButtonClicked(self):
""" Emit a AddCurve signal with a rawdata dictionary as a parameter.
The rawdata dictionary is prepared from the from the GUI's selection."""
rawdata = {}
if self.xRangeRB.isChecked():
rawdata['x'] = numpy.arange(float(self.xFromLE.text()), float(
self.xToLE.text()), float(self.xStepLE.text()))
else:
sev = SafeEvaluator()
try:
rawdata['x'] = sev.eval(str(self.xValuesLE.text()))
except:
Qt.QMessageBox.warning(
self, 'Invalid x values' 'Cannot interpret the x values.\n Use Python expressions like "[1, 3 , 67]" or "arange(100)")')
return
rawdata['f(x)'] = str(self.f_xLE.text())
self.emit(Qt.SIGNAL("AddCurve"), rawdata)
def onAddCurveButtonClicked(self):
""" Emit a AddCurve signal with a rawdata dictionary as a parameter.
The rawdata dictionary is prepared from the from the GUI's selection."""
rawdata = {}
if self.xRangeRB.isChecked():
rawdata["x"] = numpy.arange(
float(self.xFromLE.text()), float(self.xToLE.text()), float(self.xStepLE.text())
)
else:
sev = SafeEvaluator()
try:
rawdata["x"] = sev.eval(str(self.xValuesLE.text()))
except:
Qt.QMessageBox.warning(
self,
"Invalid x values"
'Cannot interpret the x values.\n Use Python expressions like "[1, 3 , 67]" or "arange(100)")',
)
return
rawdata["f(x)"] = str(self.f_xLE.text())
self.AddCurve.emit(rawdata)
class TaurusQAttribute(Qt.QObject, TaurusBaseComponent):
'''A listener for taurus attributes.
It stores the value in a numpy array and emits a
dataChanged signal when the data has changed.
'''
pyVar_RegExp = re.compile(
"[a-zA-Z_][a-zA-Z0-9_]*") # regexp for a variable/method name (symbol)
# regexp for references to qAttrs in extended models
cref_RegExp = re.compile("\$\{(.+?)\}")
def __init__(self, xmodel=None, id=None):
Qt.QObject.__init__(self)
TaurusBaseComponent.__init__(self, self.__class__.__name__)
self._attrnamevalidator = ATTRNAMEVALIDATOR
self.id = id
self.sev = SafeEvaluator()
self._referencedQAttrs = []
self.value = None
self._setExtendedModel(xmodel)
def _setExtendedModel(self, xmodel):
self._xmodel = xmodel
if xmodel is None:
self.value = None
self._transformationString = None
self.setModel('')
return
xmodel = str(xmodel)
# for formulas
if xmodel.startswith('='):
trstring, ok = self.preProcessTransformation(xmodel[1:])
if ok:
self._transformationString = trstring
self.applyTransformation()
else:
print "!!!!!!!!!!!!!", self._transformationString
return
# for tango attributes
elif self._attrnamevalidator.isValid(xmodel):
self.setModel(xmodel)
self.fireEvent(None, None, None) # fake event to force a reading
else:
self.warning('Unsupported extended model "%s". Skipping', xmodel)
# #for nexus files
# m = re.match(NEXUS_src,model)
# if m is not None:
# host,path,nxpath,slice = m.group(4,5,9,10)
# #@todo:open file and check the data is accessible
# return model, nxpath, getThemeIcon('x-office-spreadsheet'), True
# #for ascii files
# m = re.match(ASCII_src,model)
# if m is not None:
# host,path, = m.group(4,5)
# #@todo: open and check the file
# #If nothing matches...
# return model, model, getThemeIcon('dialog-warning'), False
def preProcessTransformation(self, trstring):
"""
parses the transformation string and creates the necessary symbols for
the evaluator. It also connects any referenced qAttrs so that the
transformation gets re-evaluated if they change.
:param trstring: (str) a string to be pre-processed
:return: (tuple<str,bool>) a tuple containing the processed string
and a boolean indicating if the preprocessing was successful.
if ok==True, the string is ready to be evaluated
"""
# disconnect previously referenced qAttrs and clean the list
for c in self._referencedQAttrs:
self.disconnect(c, Qt.SIGNAL("dataChanged"),
self.applyTransformation)
self._referencedQAttrs = []
# reset symbols
self.sev.resetSafe()
# Find references in the string, create qAttrs if needed, connect to
# them and change the string to use the qAttr id
trstring = re.sub(self.cref_RegExp, self.__Match2Id, trstring)
safesymbols = self.sev.getSafe().keys()
# validate the expression (look for missing symbols)
for s in set(re.findall(self.pyVar_RegExp, trstring)):
if s not in safesymbols:
self.warning('Missing symbol "%s"' % s)
return trstring, False
return trstring, True
def __Match2Id(self, match):
"""
receives a re.match object for cref_RegExp. Returns the id of an
existing qAttr corresponding to the match. The qAttr is created
if it didn't previously exist.
"""
return self.__createReference(match.groups()[0]).id
def __createReference(self, ref):
'''creates a (or gets an existing)qAttr and connects to it and adds
its id to the safe evaluation symbols. It returns the qAttr.
'''
c = taurusQAttributeFactory.getQAttr(ref)
self.connect(c, Qt.SIGNAL("dataChanged"), self.applyTransformation)
self.sev.addSafe({c.id: c.value})
self._referencedQAttrs.append(c)
return c
def applyTransformation(self):
try:
sender = self.sender()
if isinstance(sender, TaurusQAttribute):
self.sev.addSafe({sender.id: sender.value})
self.value = self.sev.eval(self._transformationString)
self.emit(Qt.SIGNAL("dataChanged"))
except Exception, e:
self.warning(
"the function '%s' could not be evaluated. Reason: %s" %
(self._transformationString, repr(e)))