mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-27 00:33:48 -05:00
956c155e8f
pep8 --ignore=E111,E128,E201,E202,E203,E211,E221,E222,E225,E226,E227,E231,E241,E261,E265,E272,E302,E303,E501,E701 \
--exclude="ui_*.py,debian/*,python/ext-libs/*" \
.
81 lines
3.2 KiB
Python
81 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
SelectByExpression.py
|
|
---------------------
|
|
Date : July 2014
|
|
Copyright : (C) 2014 by Michaël Douchin
|
|
***************************************************************************
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License as published by *
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
|
* (at your option) any later version. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
|
|
__author__ = 'Michael Douchin'
|
|
__date__ = 'July 2014'
|
|
__copyright__ = '(C) 2014, Michael Douchin'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
import processing
|
|
from qgis.core import QgsExpression, QgsFeatureRequest
|
|
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.parameters import ParameterSelection
|
|
from processing.core.outputs import OutputVector
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.parameters import ParameterString
|
|
|
|
class SelectByExpression(GeoAlgorithm):
|
|
|
|
LAYERNAME = 'LAYERNAME'
|
|
EXPRESSION= 'EXPRESSION'
|
|
RESULT = 'RESULT'
|
|
METHOD = 'METHOD'
|
|
METHODS = ['creating new selection', 'adding to current selection',
|
|
'removing from current selection']
|
|
|
|
def defineCharacteristics(self):
|
|
self.name = 'Select by expression'
|
|
self.group = 'Vector selection tools'
|
|
|
|
self.addParameter(ParameterVector(self.LAYERNAME,
|
|
self.tr('Input Layer'), [ParameterVector.VECTOR_TYPE_ANY]))
|
|
self.addParameter(ParameterString(self.EXPRESSION,
|
|
self.tr("Expression")))
|
|
self.addParameter(ParameterSelection(self.METHOD,
|
|
self.tr('Modify current selection by'), self.METHODS, 0))
|
|
self.addOutput(OutputVector(self.RESULT, self.tr('Output'), True))
|
|
|
|
def processAlgorithm(self, progress):
|
|
filename = self.getParameterValue(self.LAYERNAME)
|
|
layer = processing.getObject(filename)
|
|
oldSelection = set(layer.selectedFeaturesIds())
|
|
method = self.getParameterValue(self.METHOD)
|
|
|
|
# Build QGIS request with expression
|
|
expression = self.getParameterValue(self.EXPRESSION)
|
|
qExp = QgsExpression(expression)
|
|
if not qExp.hasParserError():
|
|
qReq = QgsFeatureRequest(qExp)
|
|
else:
|
|
raise GeoAlgorithmExecutionException(qExp.parserErrorString())
|
|
selected = [f.id() for f in layer.getFeatures(qReq)]
|
|
|
|
if method == 1:
|
|
selected = list(oldSelection.union(selected))
|
|
elif method == 2:
|
|
selected = list(oldSelection.difference(selected))
|
|
|
|
# Set the selection
|
|
layer.setSelectedFeatures(selected)
|
|
|
|
self.setOutputValue(self.RESULT, filename)
|