org.openrewrite.xml.format.AutodetectGeneralFormatStyle Maven / Gradle / Ivy
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/*
* Copyright 2022 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.xml.format;
import org.openrewrite.Tree;
import org.openrewrite.internal.lang.Nullable;
import org.openrewrite.style.GeneralFormatStyle;
import org.openrewrite.xml.XmlVisitor;
import org.openrewrite.xml.tree.Xml;
public class AutodetectGeneralFormatStyle extends XmlVisitor {
/**
* Makes a best-effort attempt to determine whether windows-style (CRLF) line endings or unix-style (LF) are
* more common in the supplied AST.
*/
public static GeneralFormatStyle autodetectGeneralFormatStyle(Xml.Document x) {
LineEndingsCount count = new LineEndingsCount();
new AutodetectGeneralFormatStyle().visit(x, count);
if(count.lf >= count.crlf) {
return new GeneralFormatStyle(false);
} else {
return new GeneralFormatStyle(true);
}
}
@Override
public @Nullable Xml visit(@Nullable Tree tree, LineEndingsCount count) {
if(tree instanceof Xml) {
String s = ((Xml) tree).getPrefix();
for (int i = 0; i < s.length(); i++) {
char current = s.charAt(i);
char next = '\0';
if(i < s.length() - 1) {
next = s.charAt(i + 1);
}
if (current == '\r' && next == '\n') {
count.crlf++;
i++; // skip the \n
} else if (current == '\n') {
count.lf++;
}
}
}
return super.visit(tree, count);
}
}
class LineEndingsCount {
public int crlf = 0;
public int lf = 0;
}