refact: minor code cleanup

org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/grammar/LineTokenizer.java

@@ -64,7 +64,7 @@ private static class MatchResult {
 	}
 
 	private static final class MatchInjectionsResult extends MatchResult {
-		boolean isPriorityMatch;
+		final boolean isPriorityMatch;
 
 		MatchInjectionsResult(final RuleId matchedRuleId, final OnigCaptureIndex[] captureIndices, final boolean isPriorityMatch) {
 			super(matchedRuleId, captureIndices);

org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigResult.java

@@ -42,10 +42,7 @@ void setIndex(final int index) {
 
 	int locationAt(final int index) {
 		final int bytes = region.getBeg(index);
-		if (bytes > 0) {
-			return bytes;
-		}
-		return 0;
+		return bytes > 0 ? bytes : 0;
 	}
 
 	int count() {
@@ -54,9 +51,6 @@ int count() {
 
 	int lengthAt(final int index) {
 		final int bytes = region.getEnd(index) - region.getBeg(index);
-		if (bytes > 0) {
-			return bytes;
-		}
-		return 0;
+		return bytes > 0 ? bytes : 0;
 	}
 }

org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigString.java

@@ -166,7 +166,7 @@ private OnigString(final String content, final byte[] bytesUTF8) {
 		bytesCount = bytesUTF8.length;
 	}
 
-	protected final String throwOutOfBoundsException(final String indexName, final int index, final int minIndex, final int maxIndex) {
+	protected final void throwOutOfBoundsException(final String indexName, final int index, final int minIndex, final int maxIndex) {
 		throw new ArrayIndexOutOfBoundsException(
 				indexName + " index " + index + " is out of range " + minIndex + ".." + maxIndex + " of " + this);
 	}

org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/parser/TMParserJSON.java

@@ -31,7 +31,7 @@ protected Map<String, Object> loadRaw(final Reader source) {
 	}
 
 	@Override
-	public final <T extends PropertySettable<?>> T parse(final Reader source, final ObjectFactory<T> factory) throws Exception {
+	public final <T extends PropertySettable<?>> T parse(final Reader source, final ObjectFactory<T> factory) {
 		final Map<String, Object> rawRoot = loadRaw(source);
 		return transform(rawRoot, factory);
 	}

org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/parser/TMParserPList.java

@@ -33,7 +33,6 @@
 import org.eclipse.jdt.annotation.Nullable;
 import org.xml.sax.Attributes;
 import org.xml.sax.InputSource;
-import org.xml.sax.SAXException;
 import org.xml.sax.XMLReader;
 import org.xml.sax.helpers.DefaultHandler;
 
@@ -89,14 +88,13 @@ public <T extends PropertySettable<?>> T parse(final Reader source, final Object
 			final StringBuilder text = new StringBuilder();
 
 			@Override
-			public void characters(final char @Nullable [] chars, final int start, final int count) throws SAXException {
+			public void characters(final char @Nullable [] chars, final int start, final int count) {
 				text.append(chars, start, count);
 			}
 
 			@Override
 			@NonNullByDefault({})
-			public void startElement(final String uri, final String localName, final String qName, final Attributes attributes)
-					throws SAXException {
+			public void startElement(final String uri, final String localName, final String qName, final Attributes attributes) {
 				text.setLength(0);
 				switch (localName) {
 					case PLIST_DICT: {
@@ -121,7 +119,7 @@ public void startElement(final String uri, final String localName, final String
 
 			@Override
 			@NonNullByDefault({})
-			public void endElement(final String uri, final String localName, final String qName) throws SAXException {
+			public void endElement(final String uri, final String localName, final String qName) {
 				switch (localName) {
 					case PLIST_ARRAY: {
 						final var parentRef = parents.remove(parents.size() - 1);
@@ -199,7 +197,7 @@ public void endElement(final String uri, final String localName, final String qN
 			}
 
 			@SuppressWarnings("unchecked")
-			protected void setCurrentProperty(final Object value) {
+			private void setCurrentProperty(final Object value) {
 				path.removeLast();
 				final var obj = parents.get(parents.size() - 1);
 				switch (obj.sourceKind) {

org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/theme/ColorMap.java

@@ -26,7 +26,7 @@
  */
 public final class ColorMap {
 
-	private boolean _isFrozen;
+	private final boolean _isFrozen;
 	private int _lastColorId = -1; // -1 and not 0 as in upstream project on purpose
 	private final List<String> _id2color = new ArrayList<>();
 	private final Map<String /*color*/, @Nullable Integer /*ID color*/> _color2id = new LinkedHashMap<>();

org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/utils/MoreCollections.java

@@ -15,6 +15,7 @@
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Objects;
 import java.util.function.Predicate;
 
 import org.eclipse.jdt.annotation.Nullable;
@@ -105,6 +106,13 @@ public static String toStringWithIndex(final List<?> list) {
 		return sb.append(']').toString();
 	}
 
+	/**
+	 * @return a new list without null elements
+	 */
+	public static <T> List<T> noNulls(final @Nullable List<T> coll) {
+		return coll == null || coll.isEmpty() ? Collections.emptyList() : coll.stream().filter(Objects::nonNull).toList();
+	}
+
 	private MoreCollections() {
 	}
 }

org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/registry/IGrammarSource.java

@@ -85,7 +85,7 @@ static IGrammarSource fromResource(final Class<?> clazz, final String resourceNa
 		final var contentType1 = contentType == null ? guessFileFormat(resourceName) : contentType;
 		return new IGrammarSource() {
 			@Override
-			public Reader getReader() throws IOException {
+			public Reader getReader() {
 				return new BufferedReader(new InputStreamReader(
 						clazz.getResourceAsStream(resourceName),
 						charset == null ? StandardCharsets.UTF_8 : charset));
@@ -107,7 +107,7 @@ static IGrammarSource fromString(final ContentType contentType, final String con
 
 		return new IGrammarSource() {
 			@Override
-			public Reader getReader() throws IOException {
+			public Reader getReader() {
 				return new StringReader(content);
 			}
 

org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/registry/IThemeSource.java

@@ -85,7 +85,7 @@ static IThemeSource fromResource(final Class<?> clazz, final String resourceName
 		final var contentType1 = contentType == null ? guessFileFormat(resourceName) : contentType;
 		return new IThemeSource() {
 			@Override
-			public Reader getReader() throws IOException {
+			public Reader getReader() {
 				return new BufferedReader(new InputStreamReader(
 						clazz.getResourceAsStream(resourceName),
 						charset == null ? StandardCharsets.UTF_8 : charset));
@@ -107,7 +107,7 @@ static IThemeSource fromString(final ContentType contentType, final String conte
 
 		return new IThemeSource() {
 			@Override
-			public Reader getReader() throws IOException {
+			public Reader getReader() {
 				return new StringReader(content);
 			}
 

org.eclipse.tm4e.languageconfiguration/src/main/java/org/eclipse/tm4e/languageconfiguration/internal/model/CompleteEnterAction.java

@@ -11,6 +11,7 @@
  */
 package org.eclipse.tm4e.languageconfiguration.internal.model;
 
+import org.eclipse.jdt.annotation.Nullable;
 import org.eclipse.tm4e.core.internal.utils.StringUtils;
 
 /**
@@ -25,11 +26,10 @@ public final class CompleteEnterAction extends EnterAction {
 	 */
 	public final String indentation;
 
-	public CompleteEnterAction(final EnterAction action, final String indentation) {
-		super(action.indentAction);
+	public CompleteEnterAction(IndentAction indentAction, @Nullable String appendText, @Nullable Integer removeText,
+			final String indentation) {
+		super(indentAction, appendText, removeText);
 		this.indentation = indentation;
-		this.appendText = action.appendText;
-		this.removeText = action.removeText;
 	}
 
 	@Override

org.eclipse.tm4e.languageconfiguration/src/main/java/org/eclipse/tm4e/languageconfiguration/internal/model/EnterAction.java

@@ -73,33 +73,21 @@ public static IndentAction get(final @Nullable String value) {
 	/**
 	 * Describes text to be appended after the new line and after the indentation.
 	 */
-	@Nullable
-	public String appendText;
+	public final @Nullable String appendText;
 
 	/**
 	 * Describes the number of characters to remove from the new line's indentation.
 	 */
-	@Nullable
-	public Integer removeText;
+	public final @Nullable Integer removeText;
 
 	public EnterAction(final IndentAction indentAction) {
-		this.indentAction = indentAction;
+		this(indentAction, null, null);
 	}
 
-	/**
-	 * @param appendText the appendText to set
-	 */
-	EnterAction withAppendText(@Nullable final String appendText) {
+	public EnterAction(final IndentAction indentAction, final @Nullable String appendText, final @Nullable Integer removeText) {
+		this.indentAction = indentAction;
 		this.appendText = appendText;
-		return this;
-	}
-
-	/**
-	 * @param removeText the removeText to set
-	 */
-	EnterAction withRemoveText(@Nullable final Integer removeText) {
 		this.removeText = removeText;
-		return this;
 	}
 
 	@Override