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The core parser functionality. This may be all you need.
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/*
* Copyright (C) 2007-2010 Júlio Vilmar Gesser.
* Copyright (C) 2011, 2013-2024 The JavaParser Team.
*
* This file is part of JavaParser.
*
* JavaParser can be used either under the terms of
* a) the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* b) the terms of the Apache License
*
* You should have received a copy of both licenses in LICENCE.LGPL and
* LICENCE.APACHE. Please refer to those files for details.
*
* JavaParser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*/
package com.github.javaparser;
import static com.github.javaparser.ParserConfiguration.LanguageLevel.POPULAR;
import com.github.javaparser.UnicodeEscapeProcessingProvider.PositionMapping;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.validator.ProblemReporter;
import com.github.javaparser.ast.validator.Validator;
import com.github.javaparser.ast.validator.language_level_validations.*;
import com.github.javaparser.ast.validator.postprocessors.*;
import com.github.javaparser.printer.lexicalpreservation.LexicalPreservingPrinter;
import com.github.javaparser.resolution.SymbolResolver;
import com.github.javaparser.utils.LineSeparator;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.function.Supplier;
/**
* The configuration that is used by the parser.
* Note that this can be changed even when reusing the same JavaParser instance.
* It will pick up the changes.
*/
public class ParserConfiguration {
public enum LanguageLevel {
/**
* Java 1.0
*/
JAVA_1_0(new Java1_0Validator(), null),
/**
* Java 1.1
*/
JAVA_1_1(new Java1_1Validator(), null),
/**
* Java 1.2
*/
JAVA_1_2(new Java1_2Validator(), null),
/**
* Java 1.3
*/
JAVA_1_3(new Java1_3Validator(), null),
/**
* Java 1.4
*/
JAVA_1_4(new Java1_4Validator(), null),
/**
* Java 5
*/
JAVA_5(new Java5Validator(), null),
/**
* Java 6
*/
JAVA_6(new Java6Validator(), null),
/**
* Java 7
*/
JAVA_7(new Java7Validator(), null),
/**
* Java 8
*/
JAVA_8(new Java8Validator(), null),
/**
* Java 9
*/
JAVA_9(new Java9Validator(), null),
/**
* Java 10
*/
JAVA_10(new Java10Validator(), new Java10PostProcessor()),
/**
* Java 10 -- including incubator/preview/second preview features.
* Note that preview features, unless otherwise specified, follow the grammar and behaviour of the latest released JEP for that feature.
*/
JAVA_10_PREVIEW(new Java10PreviewValidator(), new Java10PostProcessor()),
/**
* Java 11
*/
JAVA_11(new Java11Validator(), new Java11PostProcessor()),
/**
* Java 11 -- including incubator/preview/second preview features.
* Note that preview features, unless otherwise specified, follow the grammar and behaviour of the latest released JEP for that feature.
*/
JAVA_11_PREVIEW(new Java11PreviewValidator(), new Java11PostProcessor()),
/**
* Java 12
*/
JAVA_12(new Java12Validator(), new Java12PostProcessor()),
/**
* Java 12 -- including incubator/preview/second preview features.
* Note that preview features, unless otherwise specified, follow the grammar and behaviour of the latest released JEP for that feature.
*
* - Switch expressions are permitted, with a single label only and no yield.
*
*/
JAVA_12_PREVIEW(new Java12PreviewValidator(), new Java12PostProcessor()),
/**
* Java 13
*/
JAVA_13(new Java13Validator(), new Java13PostProcessor()),
/**
* Java 13 -- including incubator/preview/second preview features.
* Note that preview features, unless otherwise specified, follow the grammar and behaviour of the latest released JEP for that feature.
*
* - Switch expressions are permitted, with a single label only.
*
*/
JAVA_13_PREVIEW(new Java13PreviewValidator(), new Java13PostProcessor()),
/**
* Java 14
*/
JAVA_14(new Java14Validator(), new Java14PostProcessor()),
/**
* Java 14 -- including incubator/preview/second preview features.
* Note that preview features, unless otherwise specified, follow the grammar and behaviour of the latest released JEP for that feature.
*/
JAVA_14_PREVIEW(new Java14PreviewValidator(), new Java14PostProcessor()),
/**
* Java 15
*/
JAVA_15(new Java15Validator(), new Java15PostProcessor()),
/**
* Java 15 -- including incubator/preview/second preview features.
* Note that preview features, unless otherwise specified, follow the grammar and behaviour of the latest released JEP for that feature.
*/
JAVA_15_PREVIEW(new Java15PreviewValidator(), new Java15PostProcessor()),
/**
* Java 16
*/
JAVA_16(new Java16Validator(), new Java16PostProcessor()),
/**
* Java 16 -- including incubator/preview/second preview features.
* Note that preview features, unless otherwise specified, follow the grammar and behaviour of the latest released JEP for that feature.
*/
JAVA_16_PREVIEW(new Java16PreviewValidator(), new Java16PostProcessor()),
/**
* Java 17
*/
JAVA_17(new Java17Validator(), new Java17PostProcessor()),
/**
* Java 17 -- including incubator/preview/second preview features.
* Note that preview features, unless otherwise specified, follow the grammar and behaviour of the latest released JEP for that feature.
*/
JAVA_17_PREVIEW(new Java17PreviewValidator(), new Java17PostProcessor()),
/**
* Java 18
*/
JAVA_18(new Java18Validator(), new Java18PostProcessor()),
/**
* Java 19
*/
JAVA_19(new Java19Validator(), new Java19PostProcessor()),
/**
* Java 20
*/
JAVA_20(new Java20Validator(), new Java20PostProcessor()),
/**
* Java 21
*/
JAVA_21(new Java21Validator(), new Java21PostProcessor());
/**
* Does no post processing or validation. Only for people wanting the fastest parsing.
*/
public static LanguageLevel RAW = null;
/**
* The most used Java version.
*/
public static LanguageLevel POPULAR = JAVA_11;
/**
* The latest Java version that is available.
*/
public static LanguageLevel CURRENT = JAVA_18;
/**
* The newest Java features supported.
*/
public static LanguageLevel BLEEDING_EDGE = JAVA_21;
final Validator validator;
final PostProcessors postProcessor;
private static final LanguageLevel[] yieldSupport = new LanguageLevel[] {
JAVA_13,
JAVA_13_PREVIEW,
JAVA_14,
JAVA_14_PREVIEW,
JAVA_15,
JAVA_15_PREVIEW,
JAVA_16,
JAVA_16_PREVIEW,
JAVA_17,
JAVA_17_PREVIEW,
JAVA_18,
JAVA_19,
JAVA_20,
JAVA_21
};
LanguageLevel(Validator validator, PostProcessors postProcessor) {
this.validator = validator;
this.postProcessor = postProcessor;
}
public boolean isYieldSupported() {
return Arrays.stream(yieldSupport).anyMatch(level -> level == this);
}
}
// TODO: Add a configurable option e.g. setDesiredLineEnding(...) to replace/swap out existing line endings
private boolean detectOriginalLineSeparator = true;
private boolean storeTokens = true;
private boolean attributeComments = true;
private boolean doNotAssignCommentsPrecedingEmptyLines = true;
private boolean ignoreAnnotationsWhenAttributingComments = false;
private boolean lexicalPreservationEnabled = false;
private boolean preprocessUnicodeEscapes = false;
private SymbolResolver symbolResolver = null;
private int tabSize = 1;
private LanguageLevel languageLevel = POPULAR;
private Charset characterEncoding = Providers.UTF8;
private final List> processors = new ArrayList<>();
private class UnicodeEscapeProcessor extends Processor {
private UnicodeEscapeProcessingProvider _unicodeDecoder;
@Override
public Provider preProcess(Provider innerProvider) {
if (isPreprocessUnicodeEscapes()) {
_unicodeDecoder = new UnicodeEscapeProcessingProvider(innerProvider);
return _unicodeDecoder;
}
return innerProvider;
}
@Override
public void postProcess(ParseResult result, ParserConfiguration configuration) {
if (isPreprocessUnicodeEscapes()) {
result.getResult().ifPresent(root -> {
PositionMapping mapping = _unicodeDecoder.getPositionMapping();
if (!mapping.isEmpty()) {
root.walk(node -> node.getRange().ifPresent(range -> node.setRange(mapping.transform(range))));
}
});
}
}
}
private class LineEndingProcessor extends Processor {
private LineEndingProcessingProvider _lineEndingProcessingProvider;
@Override
public Provider preProcess(Provider innerProvider) {
if (isDetectOriginalLineSeparator()) {
_lineEndingProcessingProvider = new LineEndingProcessingProvider(innerProvider);
return _lineEndingProcessingProvider;
}
return innerProvider;
}
@Override
public void postProcess(ParseResult result, ParserConfiguration configuration) {
if (isDetectOriginalLineSeparator()) {
result.getResult().ifPresent(rootNode -> {
LineSeparator detectedLineSeparator = _lineEndingProcessingProvider.getDetectedLineEnding();
// Set the line ending on the root node
rootNode.setData(Node.LINE_SEPARATOR_KEY, detectedLineSeparator);
// // Set the line ending on all children of the root node -- FIXME: Should ignore """textblocks"""
// rootNode.findAll(Node.class)
// .forEach(node -> node.setData(Node.LINE_SEPARATOR_KEY, detectedLineSeparator));
});
}
}
}
public ParserConfiguration() {
processors.add(() -> ParserConfiguration.this.new UnicodeEscapeProcessor());
processors.add(() -> ParserConfiguration.this.new LineEndingProcessor());
processors.add(() -> new Processor() {
@Override
public void postProcess(ParseResult result, ParserConfiguration configuration) {
if (configuration.isAttributeComments()) {
result.ifSuccessful(resultNode -> result.getCommentsCollection()
.ifPresent(comments -> new CommentsInserter(configuration)
.insertComments(resultNode, comments.copy().getComments())));
}
}
});
processors.add(() -> new Processor() {
@Override
public void postProcess(ParseResult result, ParserConfiguration configuration) {
LanguageLevel languageLevel = getLanguageLevel();
if (languageLevel != null) {
if (languageLevel.postProcessor != null) {
languageLevel.postProcessor.postProcess(result, configuration);
}
if (languageLevel.validator != null) {
languageLevel.validator.accept(
result.getResult().get(), new ProblemReporter(newProblem -> result.getProblems()
.add(newProblem)));
}
}
}
});
processors.add(() -> new Processor() {
@Override
public void postProcess(ParseResult result, ParserConfiguration configuration) {
configuration
.getSymbolResolver()
.ifPresent(symbolResolver -> result.ifSuccessful(resultNode -> {
if (resultNode instanceof CompilationUnit) {
resultNode.setData(Node.SYMBOL_RESOLVER_KEY, symbolResolver);
}
}));
}
});
processors.add(() -> new Processor() {
@Override
public void postProcess(ParseResult result, ParserConfiguration configuration) {
if (configuration.isLexicalPreservationEnabled()) {
result.ifSuccessful(LexicalPreservingPrinter::setup);
}
}
});
}
public boolean isAttributeComments() {
return attributeComments;
}
/**
* Whether to run CommentsInserter, which will put the comments that were found in the source code into the comment
* and javadoc fields of the nodes it thinks they refer to.
*/
public ParserConfiguration setAttributeComments(boolean attributeComments) {
this.attributeComments = attributeComments;
return this;
}
public boolean isDoNotAssignCommentsPrecedingEmptyLines() {
return doNotAssignCommentsPrecedingEmptyLines;
}
public ParserConfiguration setDoNotAssignCommentsPrecedingEmptyLines(
boolean doNotAssignCommentsPrecedingEmptyLines) {
this.doNotAssignCommentsPrecedingEmptyLines = doNotAssignCommentsPrecedingEmptyLines;
return this;
}
public boolean isIgnoreAnnotationsWhenAttributingComments() {
return ignoreAnnotationsWhenAttributingComments;
}
public ParserConfiguration setIgnoreAnnotationsWhenAttributingComments(
boolean ignoreAnnotationsWhenAttributingComments) {
this.ignoreAnnotationsWhenAttributingComments = ignoreAnnotationsWhenAttributingComments;
return this;
}
public ParserConfiguration setStoreTokens(boolean storeTokens) {
this.storeTokens = storeTokens;
if (!storeTokens) {
setAttributeComments(false);
}
return this;
}
public boolean isStoreTokens() {
return storeTokens;
}
public int getTabSize() {
return tabSize;
}
/**
* When a TAB character is encountered during parsing, the column position will be increased by this value.
* By default it is 1.
*/
public ParserConfiguration setTabSize(int tabSize) {
this.tabSize = tabSize;
return this;
}
/**
* Disabled by default.
* When this is enabled, LexicalPreservingPrinter.print can be used to reproduce
* the original formatting of the file.
*/
public ParserConfiguration setLexicalPreservationEnabled(boolean lexicalPreservationEnabled) {
this.lexicalPreservationEnabled = lexicalPreservationEnabled;
return this;
}
public boolean isLexicalPreservationEnabled() {
return lexicalPreservationEnabled;
}
/**
* Retrieve the SymbolResolver to be used while parsing, if any.
*/
public Optional getSymbolResolver() {
return Optional.ofNullable(symbolResolver);
}
/**
* Set the SymbolResolver to be injected while parsing.
*/
public ParserConfiguration setSymbolResolver(SymbolResolver symbolResolver) {
this.symbolResolver = symbolResolver;
return this;
}
public List> getProcessors() {
return processors;
}
public ParserConfiguration setLanguageLevel(LanguageLevel languageLevel) {
this.languageLevel = languageLevel;
return this;
}
public LanguageLevel getLanguageLevel() {
return languageLevel;
}
/**
* When set to true, unicode escape handling is done by preprocessing the whole input,
* meaning that all unicode escapes are turned into unicode characters before parsing.
* That means the AST will never contain literal unicode escapes. However,
* positions in the AST will point to the original input, which is exactly the same as without this option.
* Without this option enabled, the unicode escapes will not be processed and are transfered intact to the AST.
*/
public ParserConfiguration setPreprocessUnicodeEscapes(boolean preprocessUnicodeEscapes) {
this.preprocessUnicodeEscapes = preprocessUnicodeEscapes;
return this;
}
public boolean isPreprocessUnicodeEscapes() {
return preprocessUnicodeEscapes;
}
public ParserConfiguration setDetectOriginalLineSeparator(boolean detectOriginalLineSeparator) {
this.detectOriginalLineSeparator = detectOriginalLineSeparator;
return this;
}
public boolean isDetectOriginalLineSeparator() {
return detectOriginalLineSeparator;
}
public Charset getCharacterEncoding() {
return characterEncoding;
}
/**
* The character encoding used for reading input from files and streams. By default UTF8 is used.
*/
public ParserConfiguration setCharacterEncoding(Charset characterEncoding) {
this.characterEncoding = characterEncoding;
return this;
}
}