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# -*- coding: utf-8 -*-
"""
***************************************************************************
SagaAlgorithm.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. *
* *
***************************************************************************
"""
__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'
import os
import shutil
import importlib
from qgis.core import (Qgis,
QgsApplication,
QgsProcessingUtils,
QgsProcessingException,
QgsMessageLog,
QgsProcessing,
QgsProcessingAlgorithm,
QgsProcessingParameterRasterLayer,
QgsProcessingParameterFeatureSource,
QgsProcessingParameterBoolean,
QgsProcessingParameterNumber,
QgsProcessingParameterEnum,
QgsProcessingParameterMultipleLayers,
QgsProcessingParameterMatrix,
QgsProcessingParameterString,
QgsProcessingParameterField,
QgsProcessingParameterFile,
QgsProcessingParameterExtent,
QgsProcessingParameterRasterDestination,
QgsProcessingParameterVectorDestination)
from processing.core.ProcessingConfig import ProcessingConfig
from processing.algs.help import shortHelp
from processing.tools.system import getTempFilename
from processing.algs.saga.SagaNameDecorator import decoratedAlgorithmName, decoratedGroupName
from processing.algs.saga.SagaParameters import Parameters
from . import SagaUtils
from .SagaAlgorithmBase import SagaAlgorithmBase
pluginPath = os.path.normpath(os.path.join(
os.path.split(os.path.dirname(__file__))[0], os.pardir))
sessionExportedLayers = {}
class SagaAlgorithm(SagaAlgorithmBase):
OUTPUT_EXTENT = 'OUTPUT_EXTENT'
def __init__(self, descriptionfile):
super().__init__()
self.hardcoded_strings = []
self.allow_nonmatching_grid_extents = False
self.description_file = descriptionfile
self.undecorated_group = None
self._name = ''
self._display_name = ''
self._group = ''
self._groupId = ''
self.params = []
self.known_issues = False
self.defineCharacteristicsFromFile()
def createInstance(self):
return SagaAlgorithm(self.description_file)
def initAlgorithm(self, config=None):
for p in self.params:
self.addParameter(p)
def name(self):
return self._name
def displayName(self):
return self._display_name
def group(self):
return self._group
def groupId(self):
return self._groupId
def shortHelpString(self):
return shortHelp.get(self.id(), None)
def icon(self):
return QgsApplication.getThemeIcon("/providerSaga.svg")
def svgIconPath(self):
return QgsApplication.iconPath("providerSaga.svg")
def flags(self):
# TODO - maybe it's safe to background thread this?
f = super().flags() | QgsProcessingAlgorithm.FlagNoThreading
if self.known_issues:
f = f | QgsProcessingAlgorithm.FlagKnownIssues
return f
def defineCharacteristicsFromFile(self):
with open(self.description_file, encoding="utf-8") as lines:
line = lines.readline().strip('\n').strip()
self._name = line
if '|' in self._name:
tokens = self._name.split('|')
self._name = tokens[0]
# cmdname is the name of the algorithm in SAGA, that is, the name to use to call it in the console
self.cmdname = tokens[1]
else:
self.cmdname = self._name
self._display_name = self.tr(str(self._name))
self._name = decoratedAlgorithmName(self._name)
self._display_name = self.tr(str(self._name))
self._name = self._name.lower()
validChars = \
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789:'
self._name = ''.join(c for c in self._name if c in validChars)
line = lines.readline().strip('\n').strip()
if line == '##known_issues':
self.known_issues = True
line = lines.readline().strip('\n').strip()
self.undecorated_group = line
self._group = self.tr(decoratedGroupName(self.undecorated_group))
validChars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789:'
grpName = decoratedGroupName(self.undecorated_group).lower()
self._groupId = ''.join(c for c in grpName if c in validChars)
line = lines.readline().strip('\n').strip()
while line != '':
if line.startswith('Hardcoded'):
self.hardcoded_strings.append(line[len('Hardcoded|'):])
elif Parameters.is_parameter_line(line):
self.params.append(Parameters.create_parameter_from_line(line))
elif line.startswith('AllowUnmatching'):
self.allow_nonmatching_grid_extents = True
else:
pass # TODO
#self.addOutput(getOutputFromString(line))
line = lines.readline().strip('\n').strip()
def processAlgorithm(self, parameters, context, feedback):
commands = list()
self.exportedLayers = {}
self.preProcessInputs()
extent = None
crs = None
# 1: Export rasters to sgrd and vectors to shp
# Tables must be in dbf format. We check that.
for param in self.parameterDefinitions():
if isinstance(param, QgsProcessingParameterRasterLayer):
if param.name() not in parameters or parameters[param.name()] is None:
continue
if isinstance(parameters[param.name()], str):
if parameters[param.name()].lower().endswith('sdat'):
self.exportedLayers[param.name()] = parameters[param.name()][:-4] + 'sgrd'
elif parameters[param.name()].lower().endswith('sgrd'):
self.exportedLayers[param.name()] = parameters[param.name()]
else:
layer = self.parameterAsRasterLayer(parameters, param.name(), context)
exportCommand = self.exportRasterLayer(param.name(), layer)
if exportCommand is not None:
commands.append(exportCommand)
else:
if parameters[param.name()].source().lower().endswith('sdat'):
self.exportedLayers[param.name()] = parameters[param.name()].source()[:-4] + 'sgrd'
if parameters[param.name()].source().lower().endswith('sgrd'):
self.exportedLayers[param.name()] = parameters[param.name()].source()
else:
exportCommand = self.exportRasterLayer(param.name(), parameters[param.name()])
if exportCommand is not None:
commands.append(exportCommand)
elif isinstance(param, QgsProcessingParameterFeatureSource):
if param.name() not in parameters or parameters[param.name()] is None:
continue
if not crs:
source = self.parameterAsSource(parameters, param.name(), context)
if source is None:
raise QgsProcessingException(self.invalidSourceError(parameters, param.name()))
crs = source.sourceCrs()
layer_path = self.parameterAsCompatibleSourceLayerPath(parameters, param.name(), context, ['shp'], 'shp', feedback=feedback)
if layer_path:
self.exportedLayers[param.name()] = layer_path
else:
raise QgsProcessingException(
self.tr('Unsupported file format'))
elif isinstance(param, QgsProcessingParameterMultipleLayers):
if param.name() not in parameters or parameters[param.name()] is None:
continue
layers = self.parameterAsLayerList(parameters, param.name(), context)
if layers is None or len(layers) == 0:
continue
if param.layerType() == QgsProcessing.TypeRaster:
files = []
for i, layer in enumerate(layers):
if layer.source().lower().endswith('sdat'):
files.append(layer.source()[:-4] + 'sgrd')
elif layer.source().lower().endswith('sgrd'):
files.append(layer.source())
else:
exportCommand = self.exportRasterLayer(param.name(), layer)
files.append(self.exportedLayers[param.name()])
if exportCommand is not None:
commands.append(exportCommand)
self.exportedLayers[param.name()] = files
else:
for layer in layers:
temp_params = {}
temp_params[param.name()] = layer
if not crs:
source = self.parameterAsSource(temp_params, param.name(), context)
if source is None:
raise QgsProcessingException(self.invalidSourceError(parameters, param.name()))
crs = source.sourceCrs()
layer_path = self.parameterAsCompatibleSourceLayerPath(temp_params, param.name(), context, ['shp'], 'shp',
feedback=feedback)
if layer_path:
if param.name() in self.exportedLayers:
self.exportedLayers[param.name()].append(layer_path)
else:
self.exportedLayers[param.name()] = [layer_path]
else:
raise QgsProcessingException(
self.tr('Unsupported file format'))
# 2: Set parameters and outputs
command = self.undecorated_group + ' "' + self.cmdname + '"'
command += ' ' + ' '.join(self.hardcoded_strings)
for param in self.parameterDefinitions():
if not param.name() in parameters or parameters[param.name()] is None:
continue
if param.isDestination():
continue
if isinstance(param, (QgsProcessingParameterRasterLayer, QgsProcessingParameterFeatureSource)):
command += ' -{} "{}"'.format(param.name(), self.exportedLayers[param.name()])
elif isinstance(param, QgsProcessingParameterMultipleLayers):
if parameters[param.name()]: # parameter may have been an empty list
command += ' -{} "{}"'.format(param.name(), ';'.join(self.exportedLayers[param.name()]))
elif isinstance(param, QgsProcessingParameterBoolean):
if self.parameterAsBoolean(parameters, param.name(), context):
command += ' -{} true'.format(param.name().strip())
else:
command += ' -{} false'.format(param.name().strip())
elif isinstance(param, QgsProcessingParameterMatrix):
tempTableFile = getTempFilename('txt')
with open(tempTableFile, 'w') as f:
f.write('\t'.join([col for col in param.headers()]) + '\n')
values = self.parameterAsMatrix(parameters, param.name(), context)
for i in range(0, len(values), 3):
s = '{}\t{}\t{}\n'.format(values[i], values[i + 1], values[i + 2])
f.write(s)
command += ' -{} "{}"'.format(param.name(), tempTableFile)
elif isinstance(param, QgsProcessingParameterExtent):
# 'We have to substract/add half cell size, since SAGA is
# center based, not corner based
halfcell = self.getOutputCellsize(parameters, context) / 2
offset = [halfcell, -halfcell, halfcell, -halfcell]
rect = self.parameterAsExtent(parameters, param.name(), context)
values = []
values.append(rect.xMinimum())
values.append(rect.xMaximum())
values.append(rect.yMinimum())
values.append(rect.yMaximum())
for i in range(4):
command += ' -{} {}'.format(param.name().split(' ')[i], float(values[i]) + offset[i])
elif isinstance(param, QgsProcessingParameterNumber):
if param.dataType() == QgsProcessingParameterNumber.Integer:
command += ' -{} {}'.format(param.name(), self.parameterAsInt(parameters, param.name(), context))
else:
command += ' -{} {}'.format(param.name(), self.parameterAsDouble(parameters, param.name(), context))
elif isinstance(param, QgsProcessingParameterEnum):
command += ' -{} {}'.format(param.name(), self.parameterAsEnum(parameters, param.name(), context))
elif isinstance(param, (QgsProcessingParameterString, QgsProcessingParameterFile)):
command += ' -{} "{}"'.format(param.name(), self.parameterAsFile(parameters, param.name(), context))
elif isinstance(param, (QgsProcessingParameterString, QgsProcessingParameterField)):
command += ' -{} "{}"'.format(param.name(), self.parameterAsString(parameters, param.name(), context))
output_layers = []
output_files = {}
#If the user has entered an output file that has non-ascii chars, we use a different path with only ascii chars
output_files_nonascii = {}
for out in self.destinationParameterDefinitions():
filePath = self.parameterAsOutputLayer(parameters, out.name(), context)
if isinstance(out, (QgsProcessingParameterRasterDestination, QgsProcessingParameterVectorDestination)):
output_layers.append(filePath)
try:
filePath.encode('ascii')
except UnicodeEncodeError:
nonAsciiFilePath = filePath
filePath = QgsProcessingUtils.generateTempFilename(out.name() + os.path.splitext(filePath)[1])
output_files_nonascii[filePath] = nonAsciiFilePath
output_files[out.name()] = filePath
command += ' -{} "{}"'.format(out.name(), filePath)
commands.append(command)
# special treatment for RGB algorithm
# TODO: improve this and put this code somewhere else
for out in self.destinationParameterDefinitions():
if isinstance(out, QgsProcessingParameterRasterDestination):
filename = self.parameterAsOutputLayer(parameters, out.name(), context)
filename2 = os.path.splitext(filename)[0] + '.sgrd'
if self.cmdname == 'RGB Composite':
commands.append('io_grid_image 0 -COLOURING 4 -GRID:"{}" -FILE:"{}"'.format(filename2, filename))
# 3: Run SAGA
commands = self.editCommands(commands)
SagaUtils.createSagaBatchJobFileFromSagaCommands(commands)
loglines = []
loglines.append(self.tr('SAGA execution commands'))
for line in commands:
feedback.pushCommandInfo(line)
loglines.append(line)
if ProcessingConfig.getSetting(SagaUtils.SAGA_LOG_COMMANDS):
QgsMessageLog.logMessage('\n'.join(loglines), self.tr('Processing'), Qgis.Info)
SagaUtils.executeSaga(feedback)
if crs is not None:
for out in output_layers:
prjFile = os.path.splitext(out)[0] + '.prj'
with open(prjFile, 'w') as f:
f.write(crs.toWkt())
for old, new in output_files_nonascii.items():
oldFolder = os.path.dirname(old)
newFolder = os.path.dirname(new)
newName = os.path.splitext(os.path.basename(new))[0]
files = [f for f in os.listdir(oldFolder)]
for f in files:
ext = os.path.splitext(f)[1]
newPath = os.path.join(newFolder, newName + ext)
oldPath = os.path.join(oldFolder, f)
shutil.move(oldPath, newPath)
result = {}
for o in self.outputDefinitions():
if o.name() in output_files:
result[o.name()] = output_files[o.name()]
return result
def preProcessInputs(self):
name = self.name().replace('.', '_')
try:
module = importlib.import_module('processing.algs.saga.ext.' + name)
except ImportError:
return
if hasattr(module, 'preProcessInputs'):
func = getattr(module, 'preProcessInputs')
func(self)
def editCommands(self, commands):
try:
module = importlib.import_module('processing.algs.saga.ext.' + self.name())
except ImportError:
return commands
if hasattr(module, 'editCommands'):
func = getattr(module, 'editCommands')
return func(commands)
else:
return commands
def getOutputCellsize(self, parameters, context):
"""Tries to guess the cell size of the output, searching for
a parameter with an appropriate name for it.
:param parameters:
"""
cellsize = 0
for param in self.parameterDefinitions():
if param.name() in parameters and param.name() == 'USER_SIZE':
cellsize = self.parameterAsDouble(parameters, param.name(), context)
break
return cellsize
def exportRasterLayer(self, parameterName, layer):
global sessionExportedLayers
if layer.source() in sessionExportedLayers:
exportedLayer = sessionExportedLayers[layer.source()]
if os.path.exists(exportedLayer):
self.exportedLayers[parameterName] = exportedLayer
return None
else:
del sessionExportedLayers[layer.source()]
if layer:
filename = layer.name()
else:
filename = os.path.basename(layer.source())
validChars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789:'
filename = ''.join(c for c in filename if c in validChars)
if len(filename) == 0:
filename = 'layer'
destFilename = QgsProcessingUtils.generateTempFilename(filename + '.sgrd')
sessionExportedLayers[layer.source()] = destFilename
self.exportedLayers[parameterName] = destFilename
return 'io_gdal 0 -TRANSFORM 1 -RESAMPLING 3 -GRIDS "{}" -FILES "{}"'.format(destFilename, layer.source())
def checkParameterValues(self, parameters, context):
"""
We check that there are no multiband layers, which are not
supported by SAGA, and that raster layers have the same grid extent
"""
extent = None
raster_layer_params = []
for param in self.parameterDefinitions():
if param not in parameters or parameters[param.name()] is None:
continue
if isinstance(param, QgsProcessingParameterRasterLayer):
raster_layer_params.append(param.name())
elif (isinstance(param, QgsProcessingParameterMultipleLayers)
and param.layerType() == QgsProcessing.TypeRaster):
raster_layer_params.extend(param.name())
for layer_param in raster_layer_params:
layer = self.parameterAsRasterLayer(parameters, layer_param, context)
if layer is None:
continue
if layer.bandCount() > 1:
return False, self.tr('Input layer {0} has more than one band.\n'
'Multiband layers are not supported by SAGA').format(layer.name())
if not self.allow_nonmatching_grid_extents:
if extent is None:
extent = (layer.extent(), layer.height(), layer.width())
else:
extent2 = (layer.extent(), layer.height(), layer.width())
if extent != extent2:
return False, self.tr("Input layers do not have the same grid extent.")
return super(SagaAlgorithm, self).checkParameterValues(parameters, context)
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