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225 lines
8.9 KiB
Python
225 lines
8.9 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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TinInterpolation.py
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---------------------
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Date : October 2016
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Copyright : (C) 2016 by Alexander Bruy
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Email : alexander dot bruy at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Alexander Bruy'
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__date__ = 'October 2016'
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__copyright__ = '(C) 2016, Alexander Bruy'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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import os
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from qgis.PyQt.QtGui import QIcon
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from qgis.core import QgsRectangle
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from qgis.analysis import (QgsInterpolator,
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QgsTINInterpolator,
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QgsGridFileWriter
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)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import (Parameter,
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ParameterNumber,
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ParameterExtent,
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ParameterSelection,
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_splitParameterOptions,
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_createDescriptiveName
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)
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from processing.core.outputs import (OutputRaster,
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OutputVector
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)
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from processing.tools import dataobjects
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class TinInterpolation(GeoAlgorithm):
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INTERPOLATION_DATA = 'INTERPOLATION_DATA'
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METHOD = 'METHOD'
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COLUMNS = 'COLUMNS'
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ROWS = 'ROWS'
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CELLSIZE_X = 'CELLSIZE_X'
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CELLSIZE_Y = 'CELLSIZE_Y'
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EXTENT = 'EXTENT'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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TRIANULATION_FILE = 'TRIANULATION_FILE'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'interpolation.png'))
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def group(self):
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return self.tr('Interpolation')
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def name(self):
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return 'tininterpolation'
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def displayName(self):
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return self.tr('TIN interpolation')
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def defineCharacteristics(self):
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self.METHODS = [self.tr('Linear'),
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self.tr('Clough-Toucher (cubic)')
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]
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class ParameterInterpolationData(Parameter):
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default_metadata = {
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'widget_wrapper': 'processing.algs.qgis.ui.InterpolationDataWidget.InterpolationDataWidgetWrapper'
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}
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def __init__(self, name='', description=''):
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Parameter.__init__(self, name, description)
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def setValue(self, value):
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if value is None:
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if not self.optional:
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return False
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self.value = None
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return True
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if value == '':
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if not self.optional:
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return False
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if isinstance(value, str):
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self.value = value if value != '' else None
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else:
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self.value = ParameterInterpolationData.dataToString(value)
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return True
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def getValueAsCommandLineParameter(self):
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return '"{}"'.format(self.value)
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def getAsScriptCode(self):
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param_type = ''
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param_type += 'interpolation data '
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return '##' + self.name + '=' + param_type
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@classmethod
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def fromScriptCode(self, line):
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isOptional, name, definition = _splitParameterOptions(line)
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descName = _createDescriptiveName(name)
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parent = definition.lower().strip()[len('interpolation data') + 1:]
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return ParameterInterpolationData(name, descName, parent)
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@staticmethod
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def dataToString(data):
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s = ''
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for c in data:
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s += '{}, {}, {:d}, {:d};'.format(c[0],
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c[1],
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c[2],
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c[3])
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return s[:-1]
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self.addParameter(ParameterInterpolationData(self.INTERPOLATION_DATA,
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self.tr('Input layer(s)')))
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self.addParameter(ParameterSelection(self.METHOD,
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self.tr('Interpolation method'),
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self.METHODS,
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0))
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self.addParameter(ParameterNumber(self.COLUMNS,
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self.tr('Number of columns'),
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0, 10000000, 300))
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self.addParameter(ParameterNumber(self.ROWS,
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self.tr('Number of rows'),
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0, 10000000, 300))
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self.addParameter(ParameterNumber(self.CELLSIZE_X,
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self.tr('Cell size X'),
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0.0, 999999.000000, 0.0))
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self.addParameter(ParameterNumber(self.CELLSIZE_Y,
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self.tr('Cell size Y'),
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0.0, 999999.000000, 0.0))
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self.addParameter(ParameterExtent(self.EXTENT,
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self.tr('Extent'),
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optional=False))
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self.addOutput(OutputRaster(self.OUTPUT_LAYER,
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self.tr('Interpolated')))
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self.addOutput(OutputVector(self.TRIANULATION_FILE,
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self.tr('Triangulation'),
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)) # datatype=dataobjects.TYPE_VECTOR_LINE))
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def processAlgorithm(self, context, feedback):
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interpolationData = self.getParameterValue(self.INTERPOLATION_DATA)
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method = self.getParameterValue(self.METHOD)
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columns = self.getParameterValue(self.COLUMNS)
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rows = self.getParameterValue(self.ROWS)
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cellsizeX = self.getParameterValue(self.CELLSIZE_X)
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cellsizeY = self.getParameterValue(self.CELLSIZE_Y)
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extent = self.getParameterValue(self.EXTENT).split(',')
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output = self.getOutputValue(self.OUTPUT_LAYER)
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triangulation = self.getOutputValue(self.TRIANULATION_FILE)
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if interpolationData is None:
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raise GeoAlgorithmExecutionException(
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self.tr('You need to specify at least one input layer.'))
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if cellsizeX == 0.0 or cellsizeY == 0.0:
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raise GeoAlgorithmExecutionException(
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self.tr('Cellsize should be greater than 0.'))
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xMin = float(extent[0])
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xMax = float(extent[1])
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yMin = float(extent[2])
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yMax = float(extent[3])
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bbox = QgsRectangle(xMin, yMin, xMax, yMax)
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layerData = []
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layers = []
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for row in interpolationData.split(';'):
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v = row.split(',')
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data = QgsInterpolator.LayerData()
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# need to keep a reference until interpolation is complete
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layer = dataobjects.getLayerFromString(v[0])
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data.vectorLayer = layer
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layers.append(layer)
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data.zCoordInterpolation = bool(v[1])
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data.interpolationAttribute = int(v[2])
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if v[3] == '0':
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data.mInputType = QgsInterpolator.POINTS
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elif v[3] == '1':
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data.mInputType = QgsInterpolator.STRUCTURE_LINES
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else:
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data.mInputType = QgsInterpolator.BREAK_LINES
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layerData.append(data)
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if method == 0:
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interpolationMethod = QgsTINInterpolator.Linear
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else:
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interpolationMethod = QgsTINInterpolator.CloughTocher
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interpolator = QgsTINInterpolator(layerData, interpolationMethod)
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interpolator.setExportTriangulationToFile(True)
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interpolator.setTriangulationFilePath(triangulation)
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writer = QgsGridFileWriter(interpolator,
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output,
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bbox,
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columns,
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rows,
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cellsizeX,
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cellsizeY)
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writer.writeFile()
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