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Posted to notifications@netbeans.apache.org by GitBox <gi...@apache.org> on 2022/10/17 15:10:57 UTC
[GitHub] [netbeans] lkishalmi commented on a diff in pull request #4800: ANTLRv4 indent and code snippet support.
lkishalmi commented on code in PR #4800:
URL: https://github.com/apache/netbeans/pull/4800#discussion_r997186368
##########
java/languages.antlr/src/org/netbeans/modules/languages/antlr/v4/Antlr4Formatter.java:
##########
@@ -0,0 +1,149 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.netbeans.modules.languages.antlr.v4;
+
+import java.util.prefs.Preferences;
+import javax.swing.text.BadLocationException;
+import javax.swing.text.Document;
+import org.antlr.parser.antlr4.ANTLRv4Lexer;
+import org.antlr.v4.runtime.CharStreams;
+import org.netbeans.modules.csl.api.Formatter;
+import org.netbeans.modules.csl.spi.ParserResult;
+import org.netbeans.modules.editor.indent.spi.Context;
+
+import static org.antlr.parser.antlr4.ANTLRv4Lexer.*;
+import org.antlr.v4.runtime.Token;
+import org.netbeans.api.editor.document.LineDocument;
+import org.netbeans.api.editor.document.LineDocumentUtils;
+import org.netbeans.api.editor.settings.SimpleValueNames;
+import org.netbeans.modules.editor.indent.spi.CodeStylePreferences;
+
+/**
+ *
+ * @author lkishalmi
+ */
+public class Antlr4Formatter implements Formatter {
+
+ public Antlr4Formatter() {
+ }
+
+ @Override
+ public void reformat(Context context, ParserResult compilationInfo) {
+ LineDocument doc = LineDocumentUtils.as(context.document(), LineDocument.class);
+ String text;
+ int indentSize = getIndentSize(context.document());
+ try {
+ text = doc.getText(0, doc.getLength());
+ } catch (BadLocationException ex) {
+ return;
+ }
+
+ ANTLRv4Lexer lexer = new ANTLRv4Lexer(CharStreams.fromString(text));
+ Token token = lexer.nextToken();
+ if (token.getType() == EOF) {
+ return;
+ }
+
+ final int cstart = context.startOffset();
+ final int cend = context.endOffset();
+
+ int tstart = token.getStartIndex();
+ int tstop = token.getStopIndex();
+
+ try {
+ boolean inRule = false;
+ int ruleLine = 0;
+ int parenDepth = 0;
+ int textDelta = 0;
+ int prevTokenType = -1;
+ while ((token.getType() != EOF) && (tstart < cend)) {
+ switch (token.getType()) {
+ case RULE_REF:
+ case TOKEN_REF:
+ // @header , @member, etc, are not real rules;
+ if (!inRule && (prevTokenType != AT)) {
+ inRule = true;
+ }
+ break;
+ case LPAREN:
+ parenDepth++;
+ break;
+ case RPAREN:
+ parenDepth--;
+ break;
+ case SEMI:
+ inRule = false;
+ break;
+ }
+ if (tstop >= cstart) {
+ if (!context.isIndent()) {
+ //TODO: Do non-indent formatting
+ }
+ if (token.getChannel() == OFF_CHANNEL) {
+ String ttext = token.getText();
+ int nl = ttext.indexOf('\n');
+ while ((nl != -1) && (tstart + nl <= cend)) {
+ int lineStart = context.lineStartOffset(tstart + textDelta + nl);
+ if (inRule || ruleLine > 0) {
+ if (tstart + nl >= cstart) {
+ // Indent the first rule line to 0 the rest to indentSize
+ int originalIndent = context.lineIndent(lineStart);
+ int newIndent = ruleLine > 0 ? indentSize : 0;
+ context.modifyIndent(lineStart, newIndent);
+ textDelta += newIndent - originalIndent;
+ }
+ ruleLine = inRule ? ruleLine + 1 : 0;
+ }
+ nl = ttext.indexOf('\n', nl + 1);
+ }
+ }
+ }
+ prevTokenType = token.getType();
+ token = lexer.nextToken();
+ tstart = token.getStartIndex();
+ tstop = token.getStopIndex();
+ }
+ } catch (BadLocationException ex) {}
+ }
+
+ @Override
+ public void reindent(Context context) {
+ reformat(context, null);
+ }
+
+ @Override
+ public boolean needsParserResult() {
+ return false;
+ }
+
+ @Override
+ public int indentSize() {
+ return 3;
+ }
Review Comment:
Just checked a few grammars today randomly. Most of them were using 4 spaces, but a few of them were using 3. It seems our ANTLR v3 and v4 grammars using 3 spaces are kind of a minority.
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