[processing] port QGIS native field calculator

python/plugins/processing/algs/CMakeLists.txt

@@ -2,5 +2,6 @@ FILE(GLOB PY_FILES *.py)
 
 ADD_SUBDIRECTORY(mmqgisx)
 ADD_SUBDIRECTORY(ftools)
+ADD_SUBDIRECTORY(ui)
 
 PLUGIN_INSTALL(processing ./algs ${PY_FILES})

python/plugins/processing/algs/FieldsCalculator.py

@@ -27,18 +27,24 @@ __revision__ = '$Format:%H$'
 
 from PyQt4.QtCore import *
 from qgis.core import *
+from processing import interface
 from processing.core.GeoAlgorithm import GeoAlgorithm
+from processing.core.GeoAlgorithmExecutionException import \
+        GeoAlgorithmExecutionException
 from processing.parameters.ParameterVector import ParameterVector
 from processing.parameters.ParameterString import ParameterString
 from processing.parameters.ParameterNumber import ParameterNumber
+from processing.parameters.ParameterBoolean import ParameterBoolean
 from processing.parameters.ParameterSelection import ParameterSelection
 from processing.outputs.OutputVector import OutputVector
 from processing.tools import dataobjects, vector
 
+from processing.algs.ui.FieldsCalculatorDialog import FieldsCalculatorDialog
 
 class FieldsCalculator(GeoAlgorithm):
 
     INPUT_LAYER = 'INPUT_LAYER'
+    NEW_FIELD = 'NEW_FIELD'
     FIELD_NAME = 'FIELD_NAME'
     FIELD_TYPE = 'FIELD_TYPE'
     FIELD_LENGTH = 'FIELD_LENGTH'
@@ -46,8 +52,8 @@ class FieldsCalculator(GeoAlgorithm):
     FORMULA = 'FORMULA'
     OUTPUT_LAYER = 'OUTPUT_LAYER'
 
-    TYPE_NAMES = ['Float', 'Integer', 'String']
-    TYPES = [QVariant.Double, QVariant.Int, QVariant.String]
+    TYPE_NAMES = ['Float', 'Integer', 'String', 'Date']
+    TYPES = [QVariant.Double, QVariant.Int, QVariant.String, QVariant.Date]
 
     def defineCharacteristics(self):
         self.name = 'Field calculator'
@@ -61,58 +67,95 @@ class FieldsCalculator(GeoAlgorithm):
         self.addParameter(ParameterNumber(self.FIELD_LENGTH, 'Field length',
                           1, 255, 10))
         self.addParameter(ParameterNumber(self.FIELD_PRECISION,
-                          'Field precision', 0, 10, 5))
+                          'Field precision', 0, 15, 3))
+        self.addParameter(ParameterBoolean(self.NEW_FIELD,
+                          'Create new field', True))
         self.addParameter(ParameterString(self.FORMULA, 'Formula'))
         self.addOutput(OutputVector(self.OUTPUT_LAYER, 'Output layer'))
 
     def processAlgorithm(self, progress):
-        fieldName = self.getParameterValue(self.FIELD_NAME)
-        fieldType = self.getParameterValue(self.FIELD_TYPE)
-        fieldLength = self.getParameterValue(self.FIELD_LENGTH)
-        fieldPrecision = self.getParameterValue(self.FIELD_PRECISION)
-        formula = self.getParameterValue(self.FORMULA)
-        output = self.getOutputFromName(self.OUTPUT_LAYER)
-
         layer = dataobjects.getObjectFromUri(
                 self.getParameterValue(self.INPUT_LAYER))
+        fieldName = self.getParameterValue(self.FIELD_NAME)
+        fieldType = self.TYPES[self.getParameterValue(self.FIELD_TYPE)]
+        width = self.getParameterValue(self.FIELD_LENGTH)
+        precision = self.getParameterValue(self.FIELD_PRECISION)
+        newField = self.getParameterValue(self.NEW_FIELD)
+        formula = self.getParameterValue(self.FORMULA)
+
+        output = self.getOutputFromName(self.OUTPUT_LAYER)
+
         provider = layer.dataProvider()
-        fields = provider.fields()
-        fields.append(QgsField(fieldName, self.TYPES[fieldType], '',
-                      fieldLength, fieldPrecision))
+        fields = layer.pendingFields()
+        if newField:
+            fields.append(QgsField(fieldName, fieldType, '', width, precision))
+
         writer = output.getVectorWriter(fields, provider.geometryType(),
-                layer.crs())
+                                        layer.crs())
 
-        outFeat = QgsFeature()
-        inGeom = QgsGeometry()
-        nFeat = provider.featureCount()
-        nElement = 0
+        exp = QgsExpression(formula)
+
+        da = QgsDistanceArea()
+        da.setSourceCrs(layer.crs().srsid())
+        canvas = interface.iface.mapCanvas()
+        da.setEllipsoidalMode(canvas.mapRenderer().hasCrsTransformEnabled())
+        da.setEllipsoid(QgsProject.instance().readEntry('Measure',
+                                                        '/Ellipsoid',
+                                                        GEO_NONE)[0])
+        exp.setGeomCalculator(da)
+
+        if not exp.prepare(layer.pendingFields()):
+            raise GeoAlgorithmExecutionException(
+                'Evaluation error: ' + exp.evalErrorString())
+
+        outFeature = QgsFeature()
+        outFeature.initAttributes(len(fields))
+        outFeature.setFields(fields)
+
+        error = ''
+        calculationSuccess = True
+
+        current = 0
         features = vector.features(layer)
+        total = 100.0 / len(features)
 
-        fieldnames = [field.name() for field in provider.fields()]
-        fieldnames.sort(key=len, reverse=False)
-        fieldidx = [fieldnames.index(field.name()) for field in
-                    provider.fields()]
-        print fieldidx
-        for inFeat in features:
-            progress.setPercentage(int(100 * nElement / nFeat))
-            attrs = inFeat.attributes()
-            expression = formula
-            for idx in fieldidx:
-                expression = expression.replace(unicode(fields[idx].name()),
-                        unicode(attrs[idx]))
-            try:
-                result = eval(expression)
-            except Exception:
-                result = None
-            nElement += 1
-            inGeom = inFeat.geometry()
-            outFeat.setGeometry(inGeom)
-            attrs = inFeat.attributes()
-            attrs.append(result)
-            outFeat.setAttributes(attrs)
-            writer.addFeature(outFeat)
+        rownum = 1
+        for f in features:
+            exp.setCurrentRowNumber(rownum)
+            value = exp.evaluate(f)
+            if exp.hasEvalError():
+                calculationSuccess = False
+                error = exp.evalErrorString()
+                break
+            else:
+                outFeature.setGeometry(f.geometry())
+                for fld in f.fields():
+                    outFeature[fld.name()] = f[fld.name()]
+                outFeature[fieldName] = value
+                writer.addFeature(outFeature)
+
+            current += 1
+            progress.setPercentage(int(current * total))
         del writer
 
+        if not calculationSuccess:
+            raise GeoAlgorithmExecutionException(
+                'An error occured while evaluating the calculation '
+                'string:\n' + error)
+
+
     def checkParameterValuesBeforeExecuting(self):
-        # TODO check that formula is correct and fields exist
-        pass
+        newField = self.getParameterValue(self.NEW_FIELD)
+        fieldName = self.getParameterValue(self.FIELD_NAME)
+        if newField and len(fieldName) == 0:
+            raise GeoAlgorithmExecutionException('Field name is not set. '
+                                                 'Please enter a field name')
+
+        outputName = self.getOutputValue(self.OUTPUT_LAYER)
+        if outputName == '':
+            raise GeoAlgorithmExecutionException('Output is not set. '
+                'Please specify valid filename')
+
+
+    def getCustomParametersDialog(self):
+        return FieldsCalculatorDialog(self)

python/plugins/processing/algs/ui/CMakeLists.txt

@@ -0,0 +1,6 @@
+FILE(GLOB PY_FILES *.py)
+
+FILE(GLOB UI_FILES *.ui)
+PYQT4_WRAP_UI(PYUI_FILES ${UI_FILES})
+
+PLUGIN_INSTALL(processing ./algs/ui ${PY_FILES} ${PYUI_FILES})

python/plugins/processing/algs/ui/DlgFieldsCalculator.ui

@@ -0,0 +1,270 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>FieldsCalculator</class>
+ <widget class="QDialog" name="FieldsCalculator">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>681</width>
+    <height>681</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Field calculator</string>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="2" column="0">
+    <widget class="QGroupBox" name="mNewFieldGroupBox">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="title">
+      <string>Create a new field</string>
+     </property>
+     <property name="flat">
+      <bool>true</bool>
+     </property>
+     <property name="checkable">
+      <bool>true</bool>
+     </property>
+     <property name="checked">
+      <bool>true</bool>
+     </property>
+     <layout class="QGridLayout">
+      <property name="sizeConstraint">
+       <enum>QLayout::SetMinimumSize</enum>
+      </property>
+      <property name="leftMargin">
+       <number>3</number>
+      </property>
+      <property name="topMargin">
+       <number>3</number>
+      </property>
+      <property name="rightMargin">
+       <number>3</number>
+      </property>
+      <property name="bottomMargin">
+       <number>0</number>
+      </property>
+      <property name="verticalSpacing">
+       <number>3</number>
+      </property>
+      <item row="0" column="0">
+       <widget class="QLabel" name="mFieldNameLabel">
+        <property name="text">
+         <string>Output field name</string>
+        </property>
+        <property name="buddy">
+         <cstring>mOutputFieldNameLineEdit</cstring>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="1" colspan="3">
+       <widget class="QLineEdit" name="mOutputFieldNameLineEdit"/>
+      </item>
+      <item row="1" column="0">
+       <widget class="QLabel" name="mOutputFieldTypeLabel">
+        <property name="text">
+         <string>Output field type</string>
+        </property>
+        <property name="buddy">
+         <cstring>mOutputFieldTypeComboBox</cstring>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1" colspan="3">
+       <widget class="QComboBox" name="mOutputFieldTypeComboBox"/>
+      </item>
+      <item row="2" column="0">
+       <widget class="QLabel" name="mOutputFieldWidthLabel">
+        <property name="text">
+         <string>Output field width</string>
+        </property>
+        <property name="buddy">
+         <cstring>mOutputFieldWidthSpinBox</cstring>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="1">
+       <widget class="QSpinBox" name="mOutputFieldWidthSpinBox">
+        <property name="toolTip">
+         <string>Width of complete output. For example 123,456 means 6 as field width.</string>
+        </property>
+        <property name="minimum">
+         <number>0</number>
+        </property>
+        <property name="value">
+         <number>15</number>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="2">
+       <widget class="QLabel" name="mOutputFieldPrecisionLabel">
+        <property name="text">
+         <string>Precision</string>
+        </property>
+        <property name="buddy">
+         <cstring>mOutputFieldPrecisionSpinBox</cstring>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="3">
+       <widget class="QSpinBox" name="mOutputFieldPrecisionSpinBox">
+        <property name="value">
+         <number>2</number>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item row="5" column="0" colspan="2">
+    <widget class="QDialogButtonBox" name="mButtonBox">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+       <horstretch>3</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="0" colspan="2">
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>Input layer</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QComboBox" name="cmbInputLayer">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="2" column="1">
+    <widget class="QGroupBox" name="mUpdateExistingGroupBox">
+     <property name="title">
+      <string>Update existing field</string>
+     </property>
+     <property name="flat">
+      <bool>true</bool>
+     </property>
+     <property name="checkable">
+      <bool>true</bool>
+     </property>
+     <property name="checked">
+      <bool>false</bool>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout">
+      <item>
+       <widget class="QComboBox" name="mExistingFieldComboBox"/>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item row="3" column="0" colspan="2">
+    <widget class="QgsExpressionBuilderWidget" name="builder" native="true">
+     <property name="autoFillBackground">
+      <bool>false</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="0" colspan="2">
+    <layout class="QHBoxLayout" name="horizontalLayout_2">
+     <item>
+      <widget class="QLabel" name="label_2">
+       <property name="text">
+        <string>Output file</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLineEdit" name="leOutputFile"/>
+     </item>
+     <item>
+      <widget class="QToolButton" name="btnBrowse">
+       <property name="text">
+        <string>...</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="4" column="0" colspan="2">
+    <widget class="QProgressBar" name="progressBar">
+     <property name="value">
+      <number>0</number>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>QgsExpressionBuilderWidget</class>
+   <extends>QWidget</extends>
+   <header>qgis.gui</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <tabstops>
+  <tabstop>mOutputFieldNameLineEdit</tabstop>
+  <tabstop>mOutputFieldTypeComboBox</tabstop>
+  <tabstop>mOutputFieldWidthSpinBox</tabstop>
+  <tabstop>mOutputFieldPrecisionSpinBox</tabstop>
+  <tabstop>mButtonBox</tabstop>
+ </tabstops>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>mButtonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>FieldsCalculator</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>679</x>
+     <y>559</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>mButtonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>FieldsCalculator</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>679</x>
+     <y>559</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

python/plugins/processing/algs/ui/FieldsCalculatorDialog.py

@@ -0,0 +1,228 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    FieldsCalculatorDialog.py
+    ---------------------
+    Date                 : October 2013
+    Copyright            : (C) 2013 by Alexander Bruy
+    Email                : alexander dot bruy 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__ = 'Alexander Bruy'
+__date__ = 'October 2013'
+__copyright__ = '(C) 2013, Alexander Bruy'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+import os
+import re
+
+from PyQt4.QtCore import *
+from PyQt4.QtGui import *
+from qgis.core import *
+from qgis.gui import *
+
+from processing.core.ProcessingConfig import ProcessingConfig
+from processing.core.ProcessingLog import ProcessingLog
+from processing.core.GeoAlgorithmExecutionException import \
+        GeoAlgorithmExecutionException
+from processing.gui.UnthreadedAlgorithmExecutor import \
+        UnthreadedAlgorithmExecutor
+from processing.gui.Postprocessing import Postprocessing
+from processing.tools import dataobjects
+
+from ui_DlgFieldsCalculator import Ui_FieldsCalculator
+
+
+class FieldsCalculatorDialog(QDialog, Ui_FieldsCalculator):
+    def __init__(self, alg):
+        QDialog.__init__(self)
+        self.setupUi( self )
+
+        self.executed = False
+        self.alg = alg
+        self.layer = None
+
+        self.cmbInputLayer.currentIndexChanged.connect(self.updateLayer)
+        self.btnBrowse.clicked.connect(self.selectFile)
+        self.mNewFieldGroupBox.toggled.connect(self.toggleExistingGroup)
+        self.mUpdateExistingGroupBox.toggled.connect(self.toggleNewGroup)
+        self.mOutputFieldTypeComboBox.currentIndexChanged.connect(
+                self.setupSpinboxes)
+
+        # Default values for field width and precision
+        self.mOutputFieldWidthSpinBox.setValue(10)
+        self.mOutputFieldPrecisionSpinBox.setValue(3)
+
+        # Output is a shapefile, so limit maximum field name length
+        self.mOutputFieldNameLineEdit.setMaxLength(10)
+
+        self.manageGui()
+
+    def manageGui(self):
+        self.mOutputFieldTypeComboBox.blockSignals(True)
+        for t in self.alg.TYPE_NAMES:
+            self.mOutputFieldTypeComboBox.addItem(t)
+        self.mOutputFieldTypeComboBox.blockSignals(False)
+
+        self.cmbInputLayer.blockSignals(True)
+        layers = dataobjects.getVectorLayers()
+        for layer in layers:
+            self.cmbInputLayer.addItem(layer.name())
+        self.cmbInputLayer.blockSignals(False)
+
+        self.updateLayer()
+
+    def updateLayer(self):
+        self.layer = dataobjects.getObject(self.cmbInputLayer.currentText())
+
+        self.builder.setLayer(self.layer)
+        self.builder.loadFieldNames()
+
+        self.populateFields()
+        #populateOutputFieldTypes()
+
+    def setupSpinboxes(self, index):
+        if index != 0:
+            self.mOutputFieldPrecisionSpinBox.setEnabled(False)
+        else:
+            self.mOutputFieldPrecisionSpinBox.setEnabled(True)
+
+        if index == 0:
+            self.mOutputFieldWidthSpinBox.setRange(1, 20)
+            self.mOutputFieldWidthSpinBox.setValue(10)
+            self.mOutputFieldPrecisionSpinBox.setRange(0, 15)
+            self.mOutputFieldPrecisionSpinBox.setValue(3)
+        elif index == 1:
+            self.mOutputFieldWidthSpinBox.setRange(1, 10)
+            self.mOutputFieldWidthSpinBox.setValue(10)
+        elif index == 2:
+            self.mOutputFieldWidthSpinBox.setRange(1, 255)
+            self.mOutputFieldWidthSpinBox.setValue(80)
+        else:
+            self.mOutputFieldWidthSpinBox.setEnabled(False)
+            self.mOutputFieldPrecisionSpinBox.setEnabled(False)
+
+    def selectFile(self):
+        output = self.alg.getOutputFromName('OUTPUT_LAYER')
+        fileFilter = output.getFileFilter(self.alg)
+
+        settings = QSettings()
+        if settings.contains('/Processing/LastOutputPath'):
+            path = settings.value('/Processing/LastOutputPath')
+        else:
+            path = ProcessingConfig.getSetting(ProcessingConfig.OUTPUT_FOLDER)
+        lastEncoding = settings.value('/Processing/encoding', 'System')
+        fileDialog = QgsEncodingFileDialog(self,
+                                           self.tr('Save file'),
+                                           path,
+                                           fileFilter,
+                                           lastEncoding)
+        fileDialog.setFileMode(QFileDialog.AnyFile)
+        fileDialog.setAcceptMode(QFileDialog.AcceptSave)
+        fileDialog.setConfirmOverwrite(True)
+        if fileDialog.exec_() == QDialog.Accepted:
+            files = fileDialog.selectedFiles()
+            encoding = unicode(fileDialog.encoding())
+            output.encoding = encoding
+            filename = unicode(files[0])
+            selectedFileFilter = unicode(fileDialog.selectedNameFilter())
+            if not filename.lower().endswith(
+                    tuple(re.findall("\*(\.[a-z]{1,5})", fileFilter))):
+                ext = re.search("\*(\.[a-z]{1,5})", selectedFileFilter)
+                if ext:
+                    filename = filename + ext.group(1)
+            self.leOutputFile.setText(filename)
+            settings.setValue('/Processing/LastOutputPath',
+                              os.path.dirname(filename))
+            settings.setValue('/Processing/encoding', encoding)
+
+    def toggleExistingGroup(self, toggled):
+        self.mUpdateExistingGroupBox.setChecked(not toggled)
+
+    def toggleNewGroup(self, toggled):
+        self.mNewFieldGroupBox.setChecked(not toggled)
+
+    def populateFields(self):
+        if self.layer is None:
+            return
+
+        fields = self.layer.pendingFields()
+        for f in fields:
+            self.mExistingFieldComboBox.addItem(f.name())
+
+    def setParamValues(self):
+        if self.mUpdateExistingGroupBox.isChecked():
+            fieldName = self.mExistingFieldComboBox.currentText()
+        else:
+            fieldName = self.mOutputFieldNameLineEdit.text()
+
+        layer = dataobjects.getObjectFromName(self.cmbInputLayer.currentText())
+
+        self.alg.setParameterValue('INPUT_LAYER', layer)
+        self.alg.setParameterValue('FIELD_NAME', fieldName)
+        self.alg.setParameterValue('FIELD_TYPE',
+                self.mOutputFieldTypeComboBox.currentIndex())
+        self.alg.setParameterValue('FIELD_LENGTH',
+                self.mOutputFieldWidthSpinBox.value())
+        self.alg.setParameterValue('FIELD_PRECISION',
+                self.mOutputFieldPrecisionSpinBox.value())
+        self.alg.setParameterValue('NEW_FIELD',
+                self.mNewFieldGroupBox.isChecked())
+        self.alg.setParameterValue('FORMULA', self.builder.expressionText())
+        self.alg.setOutputValue('OUTPUT_LAYER',
+                self.leOutputFile.text())
+        return True
+
+    def accept(self):
+        keepOpen = ProcessingConfig.getSetting(
+                ProcessingConfig.KEEP_DIALOG_OPEN)
+        try:
+            if self.setParamValues():
+                QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
+                ProcessingLog.addToLog(ProcessingLog.LOG_ALGORITHM,
+                                     self.alg.getAsCommand())
+                ret = UnthreadedAlgorithmExecutor.runalg(self.alg, self)
+                QApplication.restoreOverrideCursor()
+                if ret:
+                    Postprocessing.handleAlgorithmResults(self.alg,
+                                                          self,
+                                                          not keepOpen)
+                self.executed = True
+                QDialog.reject(self)
+            else:
+                QMessageBox.critical(self,
+                                     self.tr('Unable to execute algorithm'),
+                                     self.tr('Wrong or missing parameter '
+                                             'values'))
+                return
+        except GeoAlgorithmExecutionException, e:
+            QApplication.restoreOverrideCursor()
+            QMessageBox.critical(self, "Error",e.msg)
+            ProcessingLog.addToLog(ProcessingLog.LOG_ERROR, e.msg)
+            self.executed = False
+            QDialog.reject(self)
+
+    def reject(self):
+        self.executed = False
+        QDialog.reject(self)
+
+    def setPercentage(self, i):
+        self.progressBar.setValue(i)
+
+    def setText(self, text):
+        pass
+
+    def error(self, text):
+        ProcessingLog.addToLog(ProcessingLog.LOG_ERROR, text)

python/plugins/processing/algs/ui/ui_DlgFieldsCalculator.py

@@ -0,0 +1,148 @@
+# -*- coding: utf-8 -*-
+
+# Form implementation generated from reading ui file 'python/plugins/processing/algs/ui/DlgFieldsCalculator.ui'
+#
+# Created: Thu Oct 24 16:06:48 2013
+#      by: PyQt4 UI code generator 4.9.1
+#
+# WARNING! All changes made in this file will be lost!
+
+from PyQt4 import QtCore, QtGui
+
+try:
+    _fromUtf8 = QtCore.QString.fromUtf8
+except AttributeError:
+    _fromUtf8 = lambda s: s
+
+class Ui_FieldsCalculator(object):
+    def setupUi(self, FieldsCalculator):
+        FieldsCalculator.setObjectName(_fromUtf8("FieldsCalculator"))
+        FieldsCalculator.resize(681, 681)
+        self.gridLayout = QtGui.QGridLayout(FieldsCalculator)
+        self.gridLayout.setObjectName(_fromUtf8("gridLayout"))
+        self.mNewFieldGroupBox = QtGui.QGroupBox(FieldsCalculator)
+        sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Fixed, QtGui.QSizePolicy.Fixed)
+        sizePolicy.setHorizontalStretch(0)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.mNewFieldGroupBox.sizePolicy().hasHeightForWidth())
+        self.mNewFieldGroupBox.setSizePolicy(sizePolicy)
+        self.mNewFieldGroupBox.setFlat(True)
+        self.mNewFieldGroupBox.setCheckable(True)
+        self.mNewFieldGroupBox.setChecked(True)
+        self.mNewFieldGroupBox.setObjectName(_fromUtf8("mNewFieldGroupBox"))
+        self.gridlayout = QtGui.QGridLayout(self.mNewFieldGroupBox)
+        self.gridlayout.setSizeConstraint(QtGui.QLayout.SetMinimumSize)
+        self.gridlayout.setContentsMargins(3, 3, 3, 0)
+        self.gridlayout.setVerticalSpacing(3)
+        self.gridlayout.setObjectName(_fromUtf8("gridlayout"))
+        self.mFieldNameLabel = QtGui.QLabel(self.mNewFieldGroupBox)
+        self.mFieldNameLabel.setObjectName(_fromUtf8("mFieldNameLabel"))
+        self.gridlayout.addWidget(self.mFieldNameLabel, 0, 0, 1, 1)
+        self.mOutputFieldNameLineEdit = QtGui.QLineEdit(self.mNewFieldGroupBox)
+        self.mOutputFieldNameLineEdit.setObjectName(_fromUtf8("mOutputFieldNameLineEdit"))
+        self.gridlayout.addWidget(self.mOutputFieldNameLineEdit, 0, 1, 1, 3)
+        self.mOutputFieldTypeLabel = QtGui.QLabel(self.mNewFieldGroupBox)
+        self.mOutputFieldTypeLabel.setObjectName(_fromUtf8("mOutputFieldTypeLabel"))
+        self.gridlayout.addWidget(self.mOutputFieldTypeLabel, 1, 0, 1, 1)
+        self.mOutputFieldTypeComboBox = QtGui.QComboBox(self.mNewFieldGroupBox)
+        self.mOutputFieldTypeComboBox.setObjectName(_fromUtf8("mOutputFieldTypeComboBox"))
+        self.gridlayout.addWidget(self.mOutputFieldTypeComboBox, 1, 1, 1, 3)
+        self.mOutputFieldWidthLabel = QtGui.QLabel(self.mNewFieldGroupBox)
+        self.mOutputFieldWidthLabel.setObjectName(_fromUtf8("mOutputFieldWidthLabel"))
+        self.gridlayout.addWidget(self.mOutputFieldWidthLabel, 2, 0, 1, 1)
+        self.mOutputFieldWidthSpinBox = QtGui.QSpinBox(self.mNewFieldGroupBox)
+        self.mOutputFieldWidthSpinBox.setMinimum(0)
+        self.mOutputFieldWidthSpinBox.setProperty("value", 15)
+        self.mOutputFieldWidthSpinBox.setObjectName(_fromUtf8("mOutputFieldWidthSpinBox"))
+        self.gridlayout.addWidget(self.mOutputFieldWidthSpinBox, 2, 1, 1, 1)
+        self.mOutputFieldPrecisionLabel = QtGui.QLabel(self.mNewFieldGroupBox)
+        self.mOutputFieldPrecisionLabel.setObjectName(_fromUtf8("mOutputFieldPrecisionLabel"))
+        self.gridlayout.addWidget(self.mOutputFieldPrecisionLabel, 2, 2, 1, 1)
+        self.mOutputFieldPrecisionSpinBox = QtGui.QSpinBox(self.mNewFieldGroupBox)
+        self.mOutputFieldPrecisionSpinBox.setProperty("value", 2)
+        self.mOutputFieldPrecisionSpinBox.setObjectName(_fromUtf8("mOutputFieldPrecisionSpinBox"))
+        self.gridlayout.addWidget(self.mOutputFieldPrecisionSpinBox, 2, 3, 1, 1)
+        self.gridLayout.addWidget(self.mNewFieldGroupBox, 2, 0, 1, 1)
+        self.mButtonBox = QtGui.QDialogButtonBox(FieldsCalculator)
+        sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Fixed)
+        sizePolicy.setHorizontalStretch(3)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.mButtonBox.sizePolicy().hasHeightForWidth())
+        self.mButtonBox.setSizePolicy(sizePolicy)
+        self.mButtonBox.setOrientation(QtCore.Qt.Horizontal)
+        self.mButtonBox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.Ok)
+        self.mButtonBox.setObjectName(_fromUtf8("mButtonBox"))
+        self.gridLayout.addWidget(self.mButtonBox, 5, 0, 1, 2)
+        self.horizontalLayout = QtGui.QHBoxLayout()
+        self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
+        self.label = QtGui.QLabel(FieldsCalculator)
+        self.label.setObjectName(_fromUtf8("label"))
+        self.horizontalLayout.addWidget(self.label)
+        self.cmbInputLayer = QtGui.QComboBox(FieldsCalculator)
+        sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Fixed)
+        sizePolicy.setHorizontalStretch(0)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.cmbInputLayer.sizePolicy().hasHeightForWidth())
+        self.cmbInputLayer.setSizePolicy(sizePolicy)
+        self.cmbInputLayer.setObjectName(_fromUtf8("cmbInputLayer"))
+        self.horizontalLayout.addWidget(self.cmbInputLayer)
+        self.gridLayout.addLayout(self.horizontalLayout, 0, 0, 1, 2)
+        self.mUpdateExistingGroupBox = QtGui.QGroupBox(FieldsCalculator)
+        self.mUpdateExistingGroupBox.setFlat(True)
+        self.mUpdateExistingGroupBox.setCheckable(True)
+        self.mUpdateExistingGroupBox.setChecked(False)
+        self.mUpdateExistingGroupBox.setObjectName(_fromUtf8("mUpdateExistingGroupBox"))
+        self.verticalLayout = QtGui.QVBoxLayout(self.mUpdateExistingGroupBox)
+        self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
+        self.mExistingFieldComboBox = QtGui.QComboBox(self.mUpdateExistingGroupBox)
+        self.mExistingFieldComboBox.setObjectName(_fromUtf8("mExistingFieldComboBox"))
+        self.verticalLayout.addWidget(self.mExistingFieldComboBox)
+        self.gridLayout.addWidget(self.mUpdateExistingGroupBox, 2, 1, 1, 1)
+        self.builder = QgsExpressionBuilderWidget(FieldsCalculator)
+        self.builder.setAutoFillBackground(False)
+        self.builder.setObjectName(_fromUtf8("builder"))
+        self.gridLayout.addWidget(self.builder, 3, 0, 1, 2)
+        self.horizontalLayout_2 = QtGui.QHBoxLayout()
+        self.horizontalLayout_2.setObjectName(_fromUtf8("horizontalLayout_2"))
+        self.label_2 = QtGui.QLabel(FieldsCalculator)
+        self.label_2.setObjectName(_fromUtf8("label_2"))
+        self.horizontalLayout_2.addWidget(self.label_2)
+        self.leOutputFile = QtGui.QLineEdit(FieldsCalculator)
+        self.leOutputFile.setObjectName(_fromUtf8("leOutputFile"))
+        self.horizontalLayout_2.addWidget(self.leOutputFile)
+        self.btnBrowse = QtGui.QToolButton(FieldsCalculator)
+        self.btnBrowse.setObjectName(_fromUtf8("btnBrowse"))
+        self.horizontalLayout_2.addWidget(self.btnBrowse)
+        self.gridLayout.addLayout(self.horizontalLayout_2, 1, 0, 1, 2)
+        self.progressBar = QtGui.QProgressBar(FieldsCalculator)
+        self.progressBar.setProperty("value", 0)
+        self.progressBar.setObjectName(_fromUtf8("progressBar"))
+        self.gridLayout.addWidget(self.progressBar, 4, 0, 1, 2)
+        self.mFieldNameLabel.setBuddy(self.mOutputFieldNameLineEdit)
+        self.mOutputFieldTypeLabel.setBuddy(self.mOutputFieldTypeComboBox)
+        self.mOutputFieldWidthLabel.setBuddy(self.mOutputFieldWidthSpinBox)
+        self.mOutputFieldPrecisionLabel.setBuddy(self.mOutputFieldPrecisionSpinBox)
+
+        self.retranslateUi(FieldsCalculator)
+        QtCore.QObject.connect(self.mButtonBox, QtCore.SIGNAL(_fromUtf8("accepted()")), FieldsCalculator.accept)
+        QtCore.QObject.connect(self.mButtonBox, QtCore.SIGNAL(_fromUtf8("rejected()")), FieldsCalculator.reject)
+        QtCore.QMetaObject.connectSlotsByName(FieldsCalculator)
+        FieldsCalculator.setTabOrder(self.mOutputFieldNameLineEdit, self.mOutputFieldTypeComboBox)
+        FieldsCalculator.setTabOrder(self.mOutputFieldTypeComboBox, self.mOutputFieldWidthSpinBox)
+        FieldsCalculator.setTabOrder(self.mOutputFieldWidthSpinBox, self.mOutputFieldPrecisionSpinBox)
+        FieldsCalculator.setTabOrder(self.mOutputFieldPrecisionSpinBox, self.mButtonBox)
+
+    def retranslateUi(self, FieldsCalculator):
+        FieldsCalculator.setWindowTitle(QtGui.QApplication.translate("FieldsCalculator", "Field calculator", None, QtGui.QApplication.UnicodeUTF8))
+        self.mNewFieldGroupBox.setTitle(QtGui.QApplication.translate("FieldsCalculator", "Create a new field", None, QtGui.QApplication.UnicodeUTF8))
+        self.mFieldNameLabel.setText(QtGui.QApplication.translate("FieldsCalculator", "Output field name", None, QtGui.QApplication.UnicodeUTF8))
+        self.mOutputFieldTypeLabel.setText(QtGui.QApplication.translate("FieldsCalculator", "Output field type", None, QtGui.QApplication.UnicodeUTF8))
+        self.mOutputFieldWidthLabel.setText(QtGui.QApplication.translate("FieldsCalculator", "Output field width", None, QtGui.QApplication.UnicodeUTF8))
+        self.mOutputFieldWidthSpinBox.setToolTip(QtGui.QApplication.translate("FieldsCalculator", "Width of complete output. For example 123,456 means 6 as field width.", None, QtGui.QApplication.UnicodeUTF8))
+        self.mOutputFieldPrecisionLabel.setText(QtGui.QApplication.translate("FieldsCalculator", "Precision", None, QtGui.QApplication.UnicodeUTF8))
+        self.label.setText(QtGui.QApplication.translate("FieldsCalculator", "Input layer", None, QtGui.QApplication.UnicodeUTF8))
+        self.mUpdateExistingGroupBox.setTitle(QtGui.QApplication.translate("FieldsCalculator", "Update existing field", None, QtGui.QApplication.UnicodeUTF8))
+        self.label_2.setText(QtGui.QApplication.translate("FieldsCalculator", "Output file", None, QtGui.QApplication.UnicodeUTF8))
+        self.btnBrowse.setText(QtGui.QApplication.translate("FieldsCalculator", "...", None, QtGui.QApplication.UnicodeUTF8))
+
+from qgis.gui import QgsExpressionBuilderWidget