mirror of
https://github.com/qgis/QGIS.git
synced 2025-10-31 00:06:02 -04:00
189 lines
7.6 KiB
Python
189 lines
7.6 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
FieldPyculator.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 & NextGIS'
|
|
__date__ = 'August 2012'
|
|
__copyright__ = '(C) 2012, Victor Olaya & NextGIS'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
import sys
|
|
|
|
from qgis.PyQt.QtCore import QVariant
|
|
from qgis.core import (QgsProcessingException,
|
|
QgsField,
|
|
QgsFeatureSink,
|
|
QgsProcessingParameterFeatureSource,
|
|
QgsProcessingParameterString,
|
|
QgsProcessingParameterEnum,
|
|
QgsProcessingParameterNumber,
|
|
QgsProcessingParameterFeatureSink)
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
|
|
|
|
class FieldsPyculator(QgisAlgorithm):
|
|
|
|
INPUT = 'INPUT'
|
|
FIELD_NAME = 'FIELD_NAME'
|
|
FIELD_TYPE = 'FIELD_TYPE'
|
|
FIELD_LENGTH = 'FIELD_LENGTH'
|
|
FIELD_PRECISION = 'FIELD_PRECISION'
|
|
GLOBAL = 'GLOBAL'
|
|
FORMULA = 'FORMULA'
|
|
OUTPUT = 'OUTPUT'
|
|
RESULT_VAR_NAME = 'value'
|
|
|
|
TYPES = [QVariant.LongLong, QVariant.Double, QVariant.String]
|
|
|
|
def group(self):
|
|
return self.tr('Vector table')
|
|
|
|
def groupId(self):
|
|
return 'vectortable'
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
|
|
def initAlgorithm(self, config=None):
|
|
self.type_names = [self.tr('Integer'),
|
|
self.tr('Float'),
|
|
self.tr('String')]
|
|
|
|
self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT, self.tr('Input layer')))
|
|
self.addParameter(QgsProcessingParameterString(self.FIELD_NAME,
|
|
self.tr('Result field name'), defaultValue='NewField'))
|
|
self.addParameter(QgsProcessingParameterEnum(self.FIELD_TYPE,
|
|
self.tr('Field type'), options=self.type_names))
|
|
self.addParameter(QgsProcessingParameterNumber(self.FIELD_LENGTH,
|
|
self.tr('Field length'), minValue=1, maxValue=255, defaultValue=10))
|
|
self.addParameter(QgsProcessingParameterNumber(self.FIELD_PRECISION,
|
|
self.tr('Field precision'), minValue=0, maxValue=15, defaultValue=3))
|
|
self.addParameter(QgsProcessingParameterString(self.GLOBAL,
|
|
self.tr('Global expression'), multiLine=True, optional=True))
|
|
self.addParameter(QgsProcessingParameterString(self.FORMULA,
|
|
self.tr('Formula'), defaultValue='value = ', multiLine=True))
|
|
self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT,
|
|
self.tr('Calculated')))
|
|
|
|
def name(self):
|
|
return 'advancedpythonfieldcalculator'
|
|
|
|
def displayName(self):
|
|
return self.tr('Advanced Python field calculator')
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
source = self.parameterAsSource(parameters, self.INPUT, context)
|
|
field_name = self.parameterAsString(parameters, self.FIELD_NAME, context)
|
|
field_type = self.TYPES[self.parameterAsEnum(parameters, self.FIELD_TYPE, context)]
|
|
width = self.parameterAsInt(parameters, self.FIELD_LENGTH, context)
|
|
precision = self.parameterAsInt(parameters, self.FIELD_PRECISION, context)
|
|
code = self.parameterAsString(parameters, self.FORMULA, context)
|
|
globalExpression = self.parameterAsString(parameters, self.GLOBAL, context)
|
|
|
|
fields = source.fields()
|
|
field = QgsField(field_name, field_type, '', width, precision)
|
|
fields.append(field)
|
|
new_ns = {}
|
|
|
|
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
|
|
fields, source.wkbType(), source.sourceCrs())
|
|
|
|
# Run global code
|
|
if globalExpression.strip() != '':
|
|
try:
|
|
bytecode = compile(globalExpression, '<string>', 'exec')
|
|
exec(bytecode, new_ns)
|
|
except:
|
|
raise QgsProcessingException(
|
|
self.tr("FieldPyculator code execute error.Global code block can't be executed!\n{0}\n{1}").format(str(sys.exc_info()[0].__name__), str(sys.exc_info()[1])))
|
|
|
|
# Replace all fields tags
|
|
fields = source.fields()
|
|
num = 0
|
|
for field in fields:
|
|
field_name = str(field.name())
|
|
replval = '__attr[' + str(num) + ']'
|
|
code = code.replace('<' + field_name + '>', replval)
|
|
num += 1
|
|
|
|
# Replace all special vars
|
|
code = code.replace('$id', '__id')
|
|
code = code.replace('$geom', '__geom')
|
|
need_id = code.find('__id') != -1
|
|
need_geom = code.find('__geom') != -1
|
|
need_attrs = code.find('__attr') != -1
|
|
|
|
# Compile
|
|
try:
|
|
bytecode = compile(code, '<string>', 'exec')
|
|
except:
|
|
raise QgsProcessingException(
|
|
self.tr("FieldPyculator code execute error. Field code block can't be executed!\n{0}\n{1}").format(str(sys.exc_info()[0].__name__), str(sys.exc_info()[1])))
|
|
|
|
# Run
|
|
features = source.getFeatures()
|
|
total = 100.0 / source.featureCount() if source.featureCount() else 0
|
|
|
|
for current, feat in enumerate(features):
|
|
if feedback.isCanceled():
|
|
break
|
|
|
|
feedback.setProgress(int(current * total))
|
|
attrs = feat.attributes()
|
|
feat_id = feat.id()
|
|
|
|
# Add needed vars
|
|
if need_id:
|
|
new_ns['__id'] = feat_id
|
|
|
|
if need_geom:
|
|
geom = feat.geometry()
|
|
new_ns['__geom'] = geom
|
|
|
|
if need_attrs:
|
|
pyattrs = [a for a in attrs]
|
|
new_ns['__attr'] = pyattrs
|
|
|
|
# Clear old result
|
|
if self.RESULT_VAR_NAME in new_ns:
|
|
del new_ns[self.RESULT_VAR_NAME]
|
|
|
|
# Exec
|
|
exec(bytecode, new_ns)
|
|
|
|
# Check result
|
|
if self.RESULT_VAR_NAME not in new_ns:
|
|
raise QgsProcessingException(
|
|
self.tr("FieldPyculator code execute error\n"
|
|
"Field code block does not return '{0}' variable! "
|
|
"Please declare this variable in your code!").format(self.RESULT_VAR_NAME))
|
|
|
|
# Write feature
|
|
attrs.append(new_ns[self.RESULT_VAR_NAME])
|
|
feat.setAttributes(attrs)
|
|
sink.addFeature(feat, QgsFeatureSink.FastInsert)
|
|
|
|
return {self.OUTPUT: dest_id}
|
|
|
|
def checkParameterValues(self, parameters, context):
|
|
# TODO check that formula is correct and fields exist
|
|
return super(FieldsPyculator, self).checkParameterValues(parameters, context)
|