001    /*
002     * Copyright 2010-2015 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.kotlin.cfg.pseudocode;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.kotlin.cfg.JetControlFlowProcessor;
022    import org.jetbrains.kotlin.cfg.pseudocode.instructions.Instruction;
023    import org.jetbrains.kotlin.cfg.pseudocode.instructions.eval.ReadValueInstruction;
024    import org.jetbrains.kotlin.cfg.pseudocode.instructions.eval.WriteValueInstruction;
025    import org.jetbrains.kotlin.cfg.pseudocode.instructions.special.VariableDeclarationInstruction;
026    import org.jetbrains.kotlin.descriptors.VariableDescriptor;
027    import org.jetbrains.kotlin.diagnostics.Diagnostic;
028    import org.jetbrains.kotlin.psi.JetDeclaration;
029    import org.jetbrains.kotlin.psi.JetElement;
030    import org.jetbrains.kotlin.resolve.BindingContext;
031    import org.jetbrains.kotlin.resolve.BindingContextUtils;
032    import org.jetbrains.kotlin.resolve.BindingTrace;
033    import org.jetbrains.kotlin.util.slicedMap.ReadOnlySlice;
034    import org.jetbrains.kotlin.util.slicedMap.WritableSlice;
035    
036    import java.util.Collection;
037    
038    public class PseudocodeUtil {
039        @NotNull
040        public static Pseudocode generatePseudocode(@NotNull JetDeclaration declaration, @NotNull final BindingContext bindingContext) {
041            BindingTrace mockTrace = new BindingTrace() {
042                @NotNull
043                @Override
044                public BindingContext getBindingContext() {
045                    return bindingContext;
046                }
047    
048                @Override
049                public <K, V> void record(WritableSlice<K, V> slice, K key, V value) {
050                }
051    
052                @Override
053                public <K> void record(WritableSlice<K, Boolean> slice, K key) {
054                }
055    
056                @Override
057                public <K, V> V get(ReadOnlySlice<K, V> slice, K key) {
058                    return bindingContext.get(slice, key);
059                }
060    
061                @NotNull
062                @Override
063                public <K, V> Collection<K> getKeys(WritableSlice<K, V> slice) {
064                    return bindingContext.getKeys(slice);
065                }
066    
067                @Override
068                public void report(@NotNull Diagnostic diagnostic) {
069                }
070            };
071            return new JetControlFlowProcessor(mockTrace).generatePseudocode(declaration);
072        }
073    
074        @Nullable
075        public static VariableDescriptor extractVariableDescriptorIfAny(@NotNull Instruction instruction, boolean onlyReference, @NotNull BindingContext bindingContext) {
076            JetElement element = null;
077            if (instruction instanceof ReadValueInstruction) {
078                element = ((ReadValueInstruction) instruction).getElement();
079            }
080            else if (instruction instanceof WriteValueInstruction) {
081                element = ((WriteValueInstruction) instruction).getlValue();
082            }
083            else if (instruction instanceof VariableDeclarationInstruction) {
084                element = ((VariableDeclarationInstruction) instruction).getVariableDeclarationElement();
085            }
086            return BindingContextUtils.extractVariableDescriptorIfAny(bindingContext, element, onlyReference);
087        }
088    }