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Support Locating AST elements by Line/Column
Signed-off-by: Jonathan Leitschuh <[email protected]>
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src/main/java/org/openrewrite/analysis/util/CoordinateLocator.java
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/* | ||
* Copyright 2023 the original author or authors. | ||
* <p> | ||
* 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 | ||
* <p> | ||
* https://www.apache.org/licenses/LICENSE-2.0 | ||
* <p> | ||
* 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.analysis.util; | ||
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import fj.data.Option; | ||
import lombok.RequiredArgsConstructor; | ||
import org.openrewrite.Cursor; | ||
import org.openrewrite.Incubating; | ||
import org.openrewrite.PrintOutputCapture; | ||
import org.openrewrite.internal.lang.Nullable; | ||
import org.openrewrite.java.JavaPrinter; | ||
import org.openrewrite.java.tree.Comment; | ||
import org.openrewrite.java.tree.J; | ||
import org.openrewrite.java.tree.JavaSourceFile; | ||
import org.openrewrite.java.tree.Space; | ||
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import java.util.*; | ||
import java.util.concurrent.atomic.AtomicReference; | ||
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@Incubating(since = "2.1.6") | ||
public class CoordinateLocator { | ||
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/** | ||
* Find the first element in the AST at the given line and column. | ||
* <p> | ||
* <strong>NOTE:</strong> line and column numbers are 1-based, which matches the behavior of most editors. | ||
* </p> | ||
* | ||
* @param sourceFile The source file to search. | ||
* @param line The line number to search. 1-based. | ||
* @param column The column number to search. 1-based. | ||
* @return The first element found at the given line and column, or {@link Option#none()} if no element was found. | ||
*/ | ||
public static Option<J> findCoordinate(JavaSourceFile sourceFile, int line, int column) { | ||
if (line < 1 || column < 1) { | ||
throw new IllegalArgumentException("Line and column numbers must be 1-based"); | ||
} | ||
AtomicReference<J> found = new AtomicReference<>(); | ||
CoordinateLocatorVisitor<Integer> locatorVisitor = new CoordinateLocatorVisitor<>(line, column, found); | ||
locatorVisitor.visit( | ||
sourceFile, | ||
locatorVisitor.new CoordinateLocatorPrinter(0), new Cursor(null, "root") | ||
); | ||
return Option.fromNull(found.get()); | ||
} | ||
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@RequiredArgsConstructor | ||
private static class CoordinateLocatorVisitor<P> extends JavaPrinter<P> { | ||
private final int line; | ||
private final int column; | ||
private final AtomicReference<J> found; | ||
private int foundLineNumber = 1; | ||
private int foundColumnNumber = 1; | ||
private boolean foundLine = false; | ||
private boolean foundColumn = false; | ||
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@Override | ||
public @Nullable J preVisit(J tree, PrintOutputCapture<P> printOutputCapture) { | ||
if (foundLine && foundColumn && found.get() == null) { | ||
found.set(tree); | ||
return tree; | ||
} | ||
return super.preVisit(tree, printOutputCapture); | ||
} | ||
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class CoordinateLocatorPrinter extends PrintOutputCapture<P> { | ||
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public CoordinateLocatorPrinter(P p) { | ||
super(p); | ||
} | ||
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@Override | ||
public PrintOutputCapture<P> append(@Nullable String text) { | ||
if (found.get() != null) { | ||
// Optimization to avoid printing the rest of the file once we've found the element | ||
return this; | ||
} | ||
if (text == null) { | ||
return this; | ||
} | ||
for (int i = 0; i < text.length(); i++) { | ||
append(text.charAt(i)); | ||
} | ||
return this; | ||
} | ||
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@Override | ||
public PrintOutputCapture<P> append(char c) { | ||
if (found.get() != null) { | ||
// Optimization to avoid printing the rest of the file once we've found the element | ||
return this; | ||
} | ||
if (isNewLine(c)) { | ||
if (foundLine && !foundColumn) { | ||
throw new IllegalStateException("Found line " + line + " but did not find column " + column); | ||
} | ||
foundLineNumber++; | ||
} | ||
if (foundLineNumber == line) { | ||
foundLine = true; | ||
} | ||
if (foundLine && !isNewLine(c)) { | ||
foundColumnNumber++; | ||
} | ||
if (foundLine && foundColumnNumber == column) { | ||
foundColumn = true; | ||
} | ||
// Actually appending isn't necessary | ||
return this; | ||
} | ||
} | ||
} | ||
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/** | ||
* Find all elements in the AST at the given line. | ||
* <p> | ||
* <strong>NOTE:</strong> line number is 1-based, which matches the behavior of most editors. | ||
* </p> | ||
* | ||
* @param sourceFile The source file to search. | ||
* @param line The line number to search. 1-based. | ||
* @return The elements found at the given line, or an empty collection if no elements were found. | ||
*/ | ||
public static Collection<J> findLine(JavaSourceFile sourceFile, int line) { | ||
if (line < 1) { | ||
throw new IllegalArgumentException("Line numbers must be 1-based"); | ||
} | ||
Set<J> found = Collections.newSetFromMap(new IdentityHashMap<>()); | ||
LineLocator<Integer> locatorVisitor = new LineLocator<>(line, found); | ||
locatorVisitor.visit( | ||
sourceFile, | ||
locatorVisitor.new LineLocatorPrinter(0), new Cursor(null, "root") | ||
); | ||
return Collections.unmodifiableSet(found); | ||
} | ||
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@RequiredArgsConstructor | ||
private static class LineLocator<P> extends JavaPrinter<P> { | ||
private final int line; | ||
private final Set<J> found; | ||
private int foundLineNumber = 1; | ||
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private boolean foundLine() { | ||
return foundLineNumber == line; | ||
} | ||
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@Override | ||
public @Nullable J preVisit(J tree, PrintOutputCapture<P> pPrintOutputCapture) { | ||
if (tree.getPrefix().getWhitespace().chars().anyMatch(CoordinateLocator::isNewLine)) { | ||
// If the element has a newline prefix, then it's on a new line | ||
return super.preVisit(tree, pPrintOutputCapture); | ||
} | ||
if (tree.getPrefix().getComments().stream().anyMatch(Comment::isMultiline)) { | ||
// If the element has a multiline comment prefix, then it's on a new line | ||
return super.preVisit(tree, pPrintOutputCapture); | ||
} | ||
if (foundLine()) { | ||
found.add(tree); | ||
} | ||
return super.preVisit(tree, pPrintOutputCapture); | ||
} | ||
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class LineLocatorPrinter extends PrintOutputCapture<P> { | ||
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public LineLocatorPrinter(P p) { | ||
super(p); | ||
} | ||
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@Override | ||
public PrintOutputCapture<P> append(@Nullable String text) { | ||
if (text == null) { | ||
return this; | ||
} | ||
for (int i = 0; i < text.length(); i++) { | ||
append(text.charAt(i)); | ||
} | ||
return this; | ||
} | ||
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@Override | ||
public PrintOutputCapture<P> append(char c) { | ||
if (isNewLine(c)) { | ||
foundLineNumber++; | ||
} | ||
// Actually appending isn't necessary | ||
return this; | ||
} | ||
} | ||
} | ||
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private static boolean isNewLine(int c) { | ||
return c == '\n' || c == '\r'; | ||
} | ||
} |
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src/main/java/org/openrewrite/analysis/util/package-info.java
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/* | ||
* Copyright 2020 the original author or authors. | ||
* <p> | ||
* 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 | ||
* <p> | ||
* https://www.apache.org/licenses/LICENSE-2.0 | ||
* <p> | ||
* 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. | ||
*/ | ||
/** | ||
* This package is used to analyze the dataflow through a program. | ||
* <p> | ||
* The primary entry point for interacting with this logic is | ||
* {@link org.openrewrite.analysis.dataflow.Dataflow#startingAt(org.openrewrite.Cursor)}. | ||
*/ | ||
@NonNullApi | ||
package org.openrewrite.analysis.util; | ||
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import org.openrewrite.internal.lang.NonNullApi; |
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