def _expressionValues(self, text):
strings = self.dialog.getAvailableValuesOfType(
[QgsProcessingParameterString, QgsProcessingParameterNumber], [])
model_params = [(self.dialog.resolveValueDescription(s), s) for s in strings]
variables = QgsExpression.referencedVariables(text)
# replace description by parameter's name (diverging after model save)
descriptions = QgsExpression.referencedVariables(text)
for k, v in model_params:
if k in descriptions:
text = text.replace('[% @{} %]'.format(k), '[% @{} %]'.format(v.parameterName()))
src = QgsProcessingModelChildParameterSource.fromExpressionText(text)
# add parameters currently used by the expression
expression_values = []
expression_values.append(src)
for k, v in model_params:
if k in variables:
expression_values.append(v)
return expression_values
def _expressionValues(self, text):
strings = self.dialog.getAvailableValuesOfType(
[QgsProcessingParameterString, QgsProcessingParameterNumber], [])
model_params = [(self.dialog.resolveValueDescription(s), s) for s in strings]
variables = QgsExpression.referencedVariables(text)
# replace description by parameter's name (diverging after model save)
descriptions = QgsExpression.referencedVariables(text)
for k, v in model_params:
if k in descriptions:
text = text.replace('[% @{} %]'.format(k), '[% @{} %]'.format(v.parameterName()))
src = QgsProcessingModelChildParameterSource.fromExpressionText(text)
# add parameters currently used by the expression
expression_values = []
expression_values.append(src)
for k, v in model_params:
if k in variables:
expression_values.append(v)
return expression_values
def setValue(self, value):
text = value
if self.dialogType == DIALOG_MODELER:
if isinstance(value, list):
for v in value:
if isinstance(v, QgsProcessingModelChildParameterSource) \
and v.source() == QgsProcessingModelChildParameterSource.ExpressionText:
text = v.expressionText()
# replace parameter's name by expression (diverging after model save)
names = QgsExpression.referencedVariables(text)
strings = self.dialog.getAvailableValuesOfType([
QgsProcessingParameterString,
QgsProcessingParameterNumber
], [])
model_params = [
(self.dialog.resolveValueDescription(s), s)
for s in strings
]
for k, v in model_params:
if v.parameterName() in names:
text = text.replace(
'[% @{} %]'.format(v.parameterName()),
'[% @{} %]'.format(k))
self.mText.setPlainText(text)
def getItemsFromParamValue(self, value, child_id, context):
items = []
if isinstance(value, list):
for v in value:
items.extend(self.getItemsFromParamValue(v, child_id, context))
elif isinstance(value, QgsProcessingModelChildParameterSource):
if value.source(
) == QgsProcessingModelChildParameterSource.ModelParameter:
items.append((self.paramItems[value.parameterName()], 0))
elif value.source(
) == QgsProcessingModelChildParameterSource.ChildOutput:
outputs = self.model.childAlgorithm(
value.outputChildId()).algorithm().outputDefinitions()
for i, out in enumerate(outputs):
if out.name() == value.outputName():
break
if value.outputChildId() in self.algItems:
items.append((self.algItems[value.outputChildId()], i))
elif value.source(
) == QgsProcessingModelChildParameterSource.Expression:
variables = self.model.variablesForChildAlgorithm(
child_id, context)
exp = QgsExpression(value.expression())
for v in exp.referencedVariables():
if v in variables:
items.extend(
self.getItemsFromParamValue(
variables[v].source, child_id, context))
return items
def _expressionValues(self, text):
strings = self.dialog.getAvailableValuesOfType(
[QgsProcessingParameterString, QgsProcessingParameterNumber], [])
model_params = [(self.dialog.resolveValueDescription(s), s) for s in strings]
variables = QgsExpression.referencedVariables(text)
expression_values = []
expression_values.append(QgsProcessingModelChildParameterSource.fromExpressionText(text))
for k, v in model_params:
if k in variables:
expression_values.append(v)
return expression_values
def _expressionValues(self, text):
strings = self.dialog.getAvailableValuesOfType(
[QgsProcessingParameterString, QgsProcessingParameterNumber], [])
model_params = [(self.dialog.resolveValueDescription(s), s) for s in strings]
variables = QgsExpression.referencedVariables(text)
expression_values = []
expression_values.append(QgsProcessingModelChildParameterSource.fromExpressionText(text))
for k, v in model_params:
if k in variables:
expression_values.append(v)
return expression_values
def getItemsFromParamValue(self, value, child_id, context):
items = []
if isinstance(value, list):
for v in value:
items.extend(self.getItemsFromParamValue(v, child_id, context))
elif isinstance(value, QgsProcessingModelChildParameterSource):
if value.source() == QgsProcessingModelChildParameterSource.ModelParameter:
items.append((self.paramItems[value.parameterName()], 0))
elif value.source() == QgsProcessingModelChildParameterSource.ChildOutput:
outputs = self.model.childAlgorithm(value.outputChildId()).algorithm().outputDefinitions()
for i, out in enumerate(outputs):
if out.name() == value.outputName():
break
if value.outputChildId() in self.algItems:
items.append((self.algItems[value.outputChildId()], i))
elif value.source() == QgsProcessingModelChildParameterSource.Expression:
variables = self.model.variablesForChildAlgorithm(child_id, context)
exp = QgsExpression(value.expression())
for v in exp.referencedVariables():
if v in variables:
items.extend(self.getItemsFromParamValue(variables[v].source, child_id, context))
return items
def setValue(self, value):
text = value
if self.dialogType == DIALOG_MODELER:
if isinstance(value, list):
for v in value:
if isinstance(v, QgsProcessingModelChildParameterSource) \
and v.source() == QgsProcessingModelChildParameterSource.ExpressionText:
text = v.expressionText()
# replace parameter's name by expression (diverging after model save)
names = QgsExpression.referencedVariables(text)
strings = self.dialog.getAvailableValuesOfType(
[QgsProcessingParameterString, QgsProcessingParameterNumber], [])
model_params = [(self.dialog.resolveValueDescription(s), s) for s in strings]
for k, v in model_params:
if v.parameterName() in names:
text = text.replace('[% @{} %]'.format(v.parameterName()), '[% @{} %]'.format(k))
self.mText.setPlainText(text)
def expression_eval(expression_text,
project_id=None,
qgs_layer_id=None,
form_data=None,
formatter=0):
"""Evaluates a QgsExpression and returns the result
:param expression_text: The QgsExpression text
:type expression_text: str
:param project_id: ID of the qdjango project, defaults to None
:type project_id: int, optional
:param qgs_layer_id: ID of the QGIS Layer, defaults to None
:type qgslayer_id: str, optional
:param form_data: A dictionary that maps to a GeoJSON representation of the feature currently edited in the form
:type form_data: dict, optional
:param formatter: Indicate if form_data values contains formatter values or original features value.
:type formatter: int, optional
"""
expression = QgsExpression(expression_text)
expression_context = QgsExpressionContext()
layer = None
for func_name in expression.referencedFunctions():
if func_name in FORBIDDEN_FUNCTIONS:
raise ExpressionForbiddenError(
_('Function "{}" is not allowed for security reasons!').format(
func_name))
for var_name in expression.referencedVariables():
if var_name in FORBIDDEN_VARIABLES:
raise ExpressionForbiddenError(
_('Variable "{}" is not allowed for security reasons!').format(
var_name))
if project_id is not None:
try:
project = Project.objects.get(pk=project_id)
if qgs_layer_id is not None:
try:
layer = project.layer_set.get(qgs_layer_id=qgs_layer_id)
except Layer.DoesNotExist:
raise ExpressionLayerError(
_('QGIS layer with id "{}" could not be found!').
format(qgs_layer_id))
expression_contex = QgsExpressionContextUtils.globalProjectLayerScopes(
layer.qgis_layer)
else:
expression_contex = QgsExpressionContextUtils.globalScope()
expression_context.appendScope(
QgsExpressionContextUtils.projectScope(
project.qgis_project))
except Project.DoesNotExist:
raise ExpressionProjectError(
_('QDjango project with id "{}" could not be found!').format(
project_id))
else:
expression_contex = QgsExpressionContextUtils.globalScope()
if form_data is not None:
if layer is None:
raise ExpressionLayerError(
_('A valid QGIS layer is required to process form data!'))
try:
# Case by formatter
# formatter == 1 : get featureid from layer, usually must be used with formatter form_data
# formatter == 0 : default behavior
if formatter == 0:
fields = layer.qgis_layer.fields()
form_feature = QgsJsonUtils.stringToFeatureList(
json.dumps(form_data), fields, None)[0]
# Set attributes manually because QgsJsonUtils does not respect order
for k, v in form_data['properties'].items():
form_feature.setAttribute(k, v)
else:
qgis_feature_request = QgsFeatureRequest()
exp = expression_from_server_fids(
[form_data['id']], layer.qgis_layer.dataProvider())
qgis_feature_request.combineFilterExpression(exp)
form_feature = get_qgis_features(layer.qgis_layer,
qgis_feature_request)[0]
expression_context.appendScope(
QgsExpressionContextUtils.formScope(form_feature))
expression_context.setFeature(form_feature)
except:
raise ExpressionFormDataError()
valid, errors = expression.checkExpression(expression_text,
expression_context)
if not valid:
raise ExpressionParseError(errors)
result = expression.evaluate(expression_context)
if expression.hasEvalError():
raise ExpressionEvalError(expression.evalErrorString())
return result
