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QGIS/python/plugins/processing/core/Processing.py

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# -*- coding: utf-8 -*-
"""
***************************************************************************
Processing.py
---------------------
Date : August 2012
Copyright : (C) 2012 by Victor Olaya
Email : volayaf at gmail dot com
***************************************************************************
* *
* 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. *
* *
***************************************************************************
"""
from __future__ import print_function
from builtins import str
from builtins import object
__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import os
import traceback
from qgis.PyQt.QtCore import Qt, QCoreApplication
from qgis.PyQt.QtWidgets import QApplication
from qgis.PyQt.QtGui import QCursor
from qgis.utils import iface
from qgis.core import (QgsMessageLog,
QgsApplication,
QgsProcessingProvider)
import processing
from processing.script.ScriptUtils import ScriptUtils
from processing.core.ProcessingConfig import ProcessingConfig
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.ProcessingLog import ProcessingLog
from processing.gui.MessageBarProgress import MessageBarProgress
from processing.gui.RenderingStyles import RenderingStyles
from processing.gui.Postprocessing import handleAlgorithmResults
from processing.gui.AlgorithmExecutor import execute
from processing.tools import dataobjects, general
from processing.modeler.ModelerAlgorithmProvider import ModelerAlgorithmProvider # NOQA
from processing.algs.qgis.QGISAlgorithmProvider import QGISAlgorithmProvider # NOQA
from processing.algs.grass7.Grass7AlgorithmProvider import Grass7AlgorithmProvider # NOQA
from processing.algs.gdal.GdalAlgorithmProvider import GdalAlgorithmProvider # NOQA
from processing.algs.r.RAlgorithmProvider import RAlgorithmProvider # NOQA
from processing.algs.saga.SagaAlgorithmProvider import SagaAlgorithmProvider # NOQA
from processing.script.ScriptAlgorithmProvider import ScriptAlgorithmProvider # NOQA
from processing.preconfigured.PreconfiguredAlgorithmProvider import PreconfiguredAlgorithmProvider # NOQA
class Processing(object):
BASIC_PROVIDERS = []
@staticmethod
def activateProvider(providerOrName, activate=True):
provider_id = providerOrName.id() if isinstance(providerOrName, QgsProcessingProvider) else providerOrName
provider = QgsApplication.processingRegistry().providerById(provider_id)
try:
provider.setActive(True)
provider.refreshAlgorithms()
except:
# provider could not be activated
QgsMessageLog.logMessage(Processing.tr('Error: Provider {0} could not be activated\n').format(provider_id),
Processing.tr("Processing"))
@staticmethod
def initialize():
if "model" in [p.id() for p in QgsApplication.processingRegistry().providers()]:
return
# Add the basic providers
for c in QgsProcessingProvider.__subclasses__():
p = c()
Processing.BASIC_PROVIDERS.append(p)
QgsApplication.processingRegistry().addProvider(p)
# And initialize
ProcessingConfig.initialize()
ProcessingConfig.readSettings()
RenderingStyles.loadStyles()
@staticmethod
def deinitialize():
for p in Processing.BASIC_PROVIDERS:
QgsApplication.processingRegistry().removeProvider(p)
Processing.BASIC_PROVIDERS = []
@staticmethod
def addScripts(folder):
Processing.initialize()
provider = QgsApplication.processingRegistry().providerById("qgis")
scripts = ScriptUtils.loadFromFolder(folder)
# fix_print_with_import
print(scripts)
for script in scripts:
script.allowEdit = False
script._icon = provider._icon
provider.externalAlgs.extend(scripts)
provider.refreshAlgorithms()
@staticmethod
def removeScripts(folder):
provider = QgsApplication.processingRegistry().providerById("qgis")
for alg in provider.externalAlgs[::-1]:
path = os.path.dirname(alg.descriptionFile)
if path == folder:
provider.externalAlgs.remove(alg)
provider.refreshAlgorithms()
@staticmethod
def runAlgorithm(algOrName, onFinish, *args, **kwargs):
if isinstance(algOrName, GeoAlgorithm):
alg = algOrName
else:
alg = QgsApplication.processingRegistry().algorithmById(algOrName)
if alg is None:
# fix_print_with_import
print('Error: Algorithm not found\n')
QgsMessageLog.logMessage(Processing.tr('Error: Algorithm {0} not found\n').format(algOrName),
Processing.tr("Processing"))
return
alg = alg.getCopy()
if len(args) == 1 and isinstance(args[0], dict):
# Set params by name and try to run the alg even if not all parameter values are provided,
# by using the default values instead.
setParams = []
for (name, value) in list(args[0].items()):
param = alg.getParameterFromName(name)
if param and param.setValue(value):
setParams.append(name)
continue
output = alg.getOutputFromName(name)
if output and output.setValue(value):
continue
# fix_print_with_import
print('Error: Wrong parameter value %s for parameter %s.' % (value, name))
QgsMessageLog.logMessage(
Processing.tr('Error: Wrong parameter value {0} for parameter {1}.').format(value, name),
Processing.tr("Processing"))
ProcessingLog.addToLog(
ProcessingLog.LOG_ERROR,
Processing.tr('Error in {0}. Wrong parameter value {1} for parameter {2}.').format(
alg.name(), value, name
)
)
return
# fill any missing parameters with default values if allowed
for param in alg.parameters:
if param.name not in setParams:
if not param.setDefaultValue():
# fix_print_with_import
print('Error: Missing parameter value for parameter %s.' % param.name)
QgsMessageLog.logMessage(
Processing.tr('Error: Missing parameter value for parameter {0}.').format(param.name),
Processing.tr("Processing"))
ProcessingLog.addToLog(
ProcessingLog.LOG_ERROR,
Processing.tr('Error in {0}. Missing parameter value for parameter {1}.').format(
alg.name(), param.name)
)
return
else:
if len(args) != alg.getVisibleParametersCount() + alg.getVisibleOutputsCount():
# fix_print_with_import
print('Error: Wrong number of parameters')
QgsMessageLog.logMessage(Processing.tr('Error: Wrong number of parameters'),
Processing.tr("Processing"))
processing.algorithmHelp(algOrName)
return
i = 0
for param in alg.parameters:
if not param.hidden:
if not param.setValue(args[i]):
# fix_print_with_import
print('Error: Wrong parameter value: ' + str(args[i]))
QgsMessageLog.logMessage(Processing.tr('Error: Wrong parameter value: ') + str(args[i]),
Processing.tr("Processing"))
return
i = i + 1
for output in alg.outputs:
if not output.hidden:
if not output.setValue(args[i]):
# fix_print_with_import
print('Error: Wrong output value: ' + str(args[i]))
QgsMessageLog.logMessage(Processing.tr('Error: Wrong output value: ') + str(args[i]),
Processing.tr("Processing"))
return
i = i + 1
msg = alg._checkParameterValuesBeforeExecuting()
if msg:
# fix_print_with_import
print('Unable to execute algorithm\n' + str(msg))
QgsMessageLog.logMessage(Processing.tr('Unable to execute algorithm\n{0}').format(msg),
Processing.tr("Processing"))
return
if not alg.checkInputCRS():
print('Warning: Not all input layers use the same CRS.\n' +
'This can cause unexpected results.')
QgsMessageLog.logMessage(
Processing.tr('Warning: Not all input layers use the same CRS.\nThis can cause unexpected results.'),
Processing.tr("Processing"))
# Don't set the wait cursor twice, because then when you
# restore it, it will still be a wait cursor.
overrideCursor = False
if iface is not None:
cursor = QApplication.overrideCursor()
if cursor is None or cursor == 0:
QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
overrideCursor = True
elif cursor.shape() != Qt.WaitCursor:
QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
overrideCursor = True
feedback = None
if kwargs is not None and "feedback" in list(kwargs.keys()):
feedback = kwargs["feedback"]
elif iface is not None:
feedback = MessageBarProgress(alg.displayName())
context = general.createContext()
ret = execute(alg, context, feedback)
if ret:
if onFinish is not None:
onFinish(alg, feedback)
else:
QgsMessageLog.logMessage(Processing.tr("There were errors executing the algorithm."),
Processing.tr("Processing"))
if overrideCursor:
QApplication.restoreOverrideCursor()
if isinstance(feedback, MessageBarProgress):
feedback.close()
return alg
@staticmethod
def tr(string, context=''):
if context == '':
context = 'Processing'
return QCoreApplication.translate(context, string)
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