refact: address sonar findings

Author: sebthom

org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/rule/RegExpSourceList.java

@@ -33,7 +33,7 @@ final class RegExpSourceList {
 	private boolean hasAnchors;
 
 	private @Nullable CompiledRule cached;
-	private @Nullable final CompiledRule[][] anchorCache = new CompiledRule[2][2];
+	private final @Nullable CompiledRule[][] anchorCache = new CompiledRule[2][2];
 
 	private void disposeCache() {
 		cached = null;

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

@@ -11,7 +11,7 @@
  */
 package org.eclipse.tm4e.core.internal.theme;
 
-import static org.eclipse.tm4e.core.internal.utils.StringUtils.strArrCmp;
+import static org.eclipse.tm4e.core.internal.utils.StringUtils.*;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -150,11 +150,8 @@ public void insert(final int scopeDepth, final String scope, @Nullable final Lis
 			tail = scope.substring(dotIndex + 1);
 		}
 
-		ThemeTrieElement child = this._children.get(head);
-		if (child == null) {
-			child = new ThemeTrieElement(this._mainRule.clone(), ThemeTrieElementRule.cloneArr(this._rulesWithParentScopes));
-			this._children.put(head, child);
-		}
+		final ThemeTrieElement child = this._children.computeIfAbsent(head,
+				key -> new ThemeTrieElement(this._mainRule.clone(), ThemeTrieElementRule.cloneArr(this._rulesWithParentScopes)));
 
 		child.insert(scopeDepth + 1, tail, parentScopes, fontStyle, foreground, background);
 	}

org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/model/TMTokenizationSupport.java

@@ -16,7 +16,7 @@
  */
 package org.eclipse.tm4e.core.model;
 
-import static org.eclipse.tm4e.core.internal.utils.NullSafetyHelper.castNonNull;
+import static org.eclipse.tm4e.core.internal.utils.NullSafetyHelper.*;
 
 import java.time.Duration;
 import java.util.ArrayList;
@@ -198,13 +198,11 @@ private Integer[] getTokenIds(final String scope) {
 			tokens = new @NonNull Integer[tmpTokens.length];
 			for (int i = 0; i < tmpTokens.length; i++) {
 				final String token = tmpTokens[i];
-				Integer tokenId = this.tokenToTokenId.get(token);
-				if (tokenId == null) {
-					tokenId = ++this.lastAssignedTokenId;
-					this.tokenToTokenId.put(token, tokenId);
-					this.tokenIdToToken.add(token);
-				}
-				tokens[i] = tokenId;
+				tokens[i] = this.tokenToTokenId.computeIfAbsent(token, _token -> {
+					final var tokenId = ++this.lastAssignedTokenId;
+					this.tokenIdToToken.add(_token);
+					return tokenId;
+				});
 			}
 
 			this.scopeToTokenIds.put(scope, tokens);

org.eclipse.tm4e.languageconfiguration/src/main/java/org/eclipse/tm4e/languageconfiguration/internal/ToggleLineCommentHandler.java

@@ -453,14 +453,12 @@ private static ITextSelection expandTextSelectionToSurroundingBlockComment(final
 		final int selectionStartLine = document.getLineOfOffset(textSelectionStart);
 		final int selectionEndLine = document.getLineOfOffset(textSelectionEnd);
 		final int[] lineRange = { -1, -1 };
-		Set<Integer> lines = computeLines(new TextSelection(textSelectionStart, textSelectionEnd - textSelectionStart),
-				document);
-		lines = lines.stream().filter(l -> l >= selectionStartLine && l <= selectionEndLine && !TextUtils.isBlankLine(document, l))
-				.map(l -> {
+		computeLines(new TextSelection(textSelectionStart, textSelectionEnd - textSelectionStart), document).stream()
+				.filter(l -> l >= selectionStartLine && l <= selectionEndLine && !TextUtils.isBlankLine(document, l))
+				.forEach(l -> {
 					lineRange[0] = lineRange[0] == -1 || lineRange[0] > l ? l : lineRange[0];
 					lineRange[1] = lineRange[1] < l ? l : lineRange[1];
-					return l;
-				}).collect(Collectors.toSet());
+				});
 
 		final Set<ITypedRegion> comments = getBlockCommentParts(document, textSelectionStart,
 				textSelectionEnd - textSelectionStart, open, close);

org.eclipse.tm4e.markdown/src/main/java/org/eclipse/tm4e/markdown/marked/Lexer.java

@@ -48,8 +48,10 @@ public static Tokens lex(final String src, @Nullable final Options options) {
 	}
 
 	private Tokens lex(String src) {
-		src = src.replaceAll("\r\n|\r", "\n").replaceAll("\t", "    ").replaceAll("\u00a0", " ").replaceAll("\u2424",
-				"\n");
+		src = src.replaceAll("\r\n|\r", "\n") //
+				.replace("\t", "    ") //
+				.replace("\u00a0", " ") //
+				.replace("\u2424", "\n");
 		return this.token(src, true);
 	}
 

org.eclipse.tm4e.ui/src/main/java/org/eclipse/tm4e/ui/text/TMPresentationReconciler.java

@@ -304,34 +304,34 @@ IRegion getRegionOfTextEvent(final TextEvent event) {
 					? viewerExt5.widgetRange2ModelRange(new Region(event.getOffset(), length))
 					: new Region(event.getOffset() + viewer.getVisibleRegion().getOffset(), length);
 		}
-	}
 
-	/**
-	 * Finds a grammar for the given document.
-	 */
-	private @Nullable IGrammar findGrammar(final IDocument doc) {
-		final IGrammar currentGrammar = isForcedGrammar ? this.grammar : null;
-		if (currentGrammar != null)
-			return currentGrammar;
-
-		final ContentTypeInfo info = ContentTypeHelper.findContentTypes(doc);
-		if (info == null)
-			return null;
-
-		final IContentType[] contentTypes = info.getContentTypes();
-		// try to determine the grammar based on the content types
-		IGrammar grammar = TMEclipseRegistryPlugin.getGrammarRegistryManager().getGrammarFor(contentTypes);
-		if (grammar == null) {
-			// try to determine the grammar based on the file type
-			final String fileName = info.getFileName();
-			if (fileName.indexOf('.') > -1) {
-				final String fileExtension = new Path(fileName).getFileExtension();
-				if (fileExtension != null) {
-					grammar = TMEclipseRegistryPlugin.getGrammarRegistryManager().getGrammarForFileExtension(fileExtension);
+		/**
+		 * Finds a grammar for the given document.
+		 */
+		private @Nullable IGrammar findGrammar(final IDocument doc) {
+			final IGrammar currentGrammar = isForcedGrammar ? TMPresentationReconciler.this.grammar : null;
+			if (currentGrammar != null)
+				return currentGrammar;
+
+			final ContentTypeInfo info = ContentTypeHelper.findContentTypes(doc);
+			if (info == null)
+				return null;
+
+			final IContentType[] contentTypes = info.getContentTypes();
+			// try to determine the grammar based on the content types
+			IGrammar grammar = TMEclipseRegistryPlugin.getGrammarRegistryManager().getGrammarFor(contentTypes);
+			if (grammar == null) {
+				// try to determine the grammar based on the file type
+				final String fileName = info.getFileName();
+				if (fileName.indexOf('.') > -1) {
+					final String fileExtension = new Path(fileName).getFileExtension();
+					if (fileExtension != null) {
+						grammar = TMEclipseRegistryPlugin.getGrammarRegistryManager().getGrammarForFileExtension(fileExtension);
+					}
 				}
 			}
+			return grammar;
 		}
-		return grammar;
 	}
 
 	public @Nullable IGrammar getGrammar() {