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/*
* Copyright 2000-2013 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jetbrains.python.codeInsight.stdlib;
import com.intellij.codeInsight.lookup.LookupElementBuilder;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiElement;
import com.intellij.util.ArrayUtil;
import com.intellij.util.ProcessingContext;
import com.jetbrains.python.PyNames;
import com.jetbrains.python.psi.*;
import com.jetbrains.python.psi.impl.PyBuiltinCache;
import com.jetbrains.python.psi.impl.PyElementImpl;
import com.jetbrains.python.psi.impl.PyPsiUtils;
import com.jetbrains.python.psi.resolve.PyResolveContext;
import com.jetbrains.python.psi.resolve.RatedResolveResult;
import com.jetbrains.python.psi.types.*;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* @author yole
*/
public class PyNamedTupleType extends PyClassTypeImpl implements PyCallableType {
private final String myName;
// 2 - namedtuple call itself
// 1 - return type of namedtuple call, aka namedtuple class
// 0 - namedtuple instance
private final int myDefinitionLevel;
private final PsiElement myDeclaration;
private final List<String> myFields;
public PyNamedTupleType(PyClass tupleClass, PsiElement declaration, String name, List<String> fields, int definitionLevel) {
super(tupleClass, definitionLevel > 0);
myDeclaration = declaration;
myFields = fields;
myName = name;
myDefinitionLevel = definitionLevel;
}
@Nullable
@Override
public List<? extends RatedResolveResult> resolveMember(@NotNull String name,
@Nullable PyExpression location,
@NotNull AccessDirection direction,
@NotNull PyResolveContext resolveContext,
boolean inherited) {
final List<? extends RatedResolveResult> classMembers = super.resolveMember(name, location, direction, resolveContext, inherited);
if (classMembers != null && !classMembers.isEmpty()) {
return classMembers;
}
if (myFields.contains(name)) {
return Collections.singletonList(new RatedResolveResult(1000, new PyElementImpl(myDeclaration.getNode())));
}
return null;
}
@Override
public Object[] getCompletionVariants(String completionPrefix, PsiElement location, ProcessingContext context) {
List<Object> result = new ArrayList<Object>();
Collections.addAll(result, super.getCompletionVariants(completionPrefix, location, context));
for (String field : myFields) {
result.add(LookupElementBuilder.create(field));
}
return ArrayUtil.toObjectArray(result);
}
@Override
public String getName() {
return myName;
}
@Override
public boolean isBuiltin() {
return false;
}
@Nullable
@Override
public PyType getCallType(@NotNull TypeEvalContext context, @NotNull PyCallSiteExpression callSite) {
if (myDefinitionLevel > 0) {
return new PyNamedTupleType(myClass, myDeclaration, myName, myFields, myDefinitionLevel-1);
}
return null;
}
@Override
public PyClassType toInstance() {
return myDefinitionLevel == 1 ? new PyNamedTupleType(myClass, myDeclaration, myName, myFields, 0) : this;
}
@Override
public String toString() {
return "PyNamedTupleType: " + myName;
}
@Nullable
public static PyType fromCall(PyCallExpression call, int level) {
final String name = PyPsiUtils.strValue(call.getArgument(0, PyExpression.class));
final PyExpression fieldNamesExpression = PyPsiUtils.flattenParens(call.getArgument(1, PyExpression.class));
if (name == null || fieldNamesExpression == null) {
return null;
}
List<String> fieldNames = null;
if (fieldNamesExpression instanceof PySequenceExpression) {
fieldNames = PyUtil.strListValue(fieldNamesExpression);
}
else {
final String fieldNamesString = PyPsiUtils.strValue(fieldNamesExpression);
if (fieldNamesString != null) {
fieldNames = parseFieldNamesString(fieldNamesString);
}
}
if (fieldNames != null) {
PyClass tuple = PyBuiltinCache.getInstance(call).getClass(PyNames.FAKE_NAMEDTUPLE);
if (tuple != null) {
return new PyNamedTupleType(tuple, call, name, fieldNames, level);
}
}
return null;
}
private static List<String> parseFieldNamesString(String fieldNamesString) {
List<String> result = new ArrayList<String>();
for(String name: StringUtil.tokenize(fieldNamesString, ", ")) {
result.add(name);
}
return result;
}
public int getElementCount() {
return myFields.size();
}
}
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