org.openrewrite.yaml.cleanup.RemoveUnusedVisitor Maven / Gradle / Ivy
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/*
* Copyright 2021 the original author or authors.
*
* 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
*
* https://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 org.openrewrite.yaml.cleanup;
import org.jspecify.annotations.Nullable;
import org.openrewrite.Cursor;
import org.openrewrite.internal.ListUtils;
import org.openrewrite.yaml.YamlIsoVisitor;
import org.openrewrite.yaml.tree.Yaml;
public class RemoveUnusedVisitor
extends YamlIsoVisitor
{
@Nullable
private final Cursor cursor;
public RemoveUnusedVisitor(@Nullable Cursor cursor) {
this.cursor = cursor;
}
@Override
public Yaml.Sequence visitSequence(Yaml.Sequence sequence, P p) {
Yaml.Sequence s = super.visitSequence(sequence, p);
if (cursor == null || cursor.isScopeInPath(s)) {
s = s.withEntries(ListUtils.map(s.getEntries(), e -> {
if (e.getBlock() == null || isEmptyScalar(e.getBlock())) {
return null;
}
return e;
}));
if (s.getEntries().isEmpty()) {
//noinspection ConstantConditions
return null;
}
}
return s;
}
@Override
public Yaml.Mapping visitMapping(Yaml.Mapping mapping, P p) {
Yaml.Mapping m = super.visitMapping(mapping, p);
if (cursor == null || cursor.isScopeInPath(m)) {
m = m.withEntries(ListUtils.map(m.getEntries(), e -> {
if (e.getValue() == null || isEmptyScalar(e.getValue())) {
return null;
}
if (e.getValue() instanceof Yaml.Mapping &&
((Yaml.Mapping) e.getValue()).getEntries().isEmpty()) {
return null;
}
return e;
}));
if (m.getEntries().isEmpty()) {
//noinspection ConstantConditions
return null;
}
}
return m;
}
private boolean isEmptyScalar(Yaml.Block y) {
if (y instanceof Yaml.Scalar) {
Yaml.Scalar scalar = (Yaml.Scalar) y;
return scalar.getValue().isEmpty() && Yaml.Scalar.Style.PLAIN.equals(scalar.getStyle());
}
return false;
}
}