added AntlrBaseParser adapter and SwiftParserAdapter

pmd-core/src/main/java/net/sourceforge/pmd/lang/antlr/AntlrBaseParser.java

@@ -0,0 +1,74 @@
+/**
+ * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
+ */
+
+package net.sourceforge.pmd.lang.antlr;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.antlr.v4.runtime.Lexer;
+
+import net.sourceforge.pmd.lang.Parser;
+import net.sourceforge.pmd.lang.ParserOptions;
+import net.sourceforge.pmd.lang.TokenManager;
+import net.sourceforge.pmd.lang.ast.AntlrBaseNode;
+import net.sourceforge.pmd.lang.ast.Node;
+import net.sourceforge.pmd.lang.ast.ParseException;
+
+/**
+ * Generic Antlr parser adapter for all Antlr parsers.
+ */
+public abstract class AntlrBaseParser implements Parser {
+
+    protected final ParserOptions parserOptions;
+
+    public AntlrBaseParser(final ParserOptions parserOptions) {
+        this.parserOptions = parserOptions;
+    }
+
+    @Override
+    public ParserOptions getParserOptions() {
+        return parserOptions;
+    }
+
+    @Override
+    public TokenManager getTokenManager(final String fileName, final Reader source) {
+        try {
+            return new AntlrTokenManager(getLexer(source), fileName);
+        } catch (final IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public Node parse(final String fileName, final Reader source) throws ParseException {
+        AntlrBaseNode rootNode = null;
+        try {
+            rootNode = getRootNode(getParser(getLexer(source)));
+        } catch (final IOException | NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+        return rootNode;
+    }
+
+    private AntlrBaseNode getRootNode(final org.antlr.v4.runtime.Parser parser)
+            throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
+        final Method rootMethod = parser.getClass().getMethod(parser.getRuleNames()[0]);
+        return (AntlrBaseNode) rootMethod.invoke(parser);
+    }
+
+    @Override
+    public Map<Integer, String> getSuppressMap() {
+        return new HashMap<>();
+    }
+
+    protected abstract Lexer getLexer(Reader source) throws IOException;
+
+    protected abstract org.antlr.v4.runtime.Parser getParser(Lexer lexer);
+}

pmd-swift/src/main/java/net/sourceforge/pmd/lang/swift/SwiftParserAdapter.java

@@ -0,0 +1,43 @@
+/**
+ * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
+ */
+
+package net.sourceforge.pmd.lang.swift;
+
+import java.io.IOException;
+import java.io.Reader;
+
+import org.antlr.v4.runtime.CharStreams;
+import org.antlr.v4.runtime.CommonTokenStream;
+import org.antlr.v4.runtime.Lexer;
+import org.antlr.v4.runtime.Parser;
+
+import net.sourceforge.pmd.lang.ParserOptions;
+import net.sourceforge.pmd.lang.antlr.AntlrBaseParser;
+import net.sourceforge.pmd.lang.swift.antlr4.SwiftLexer;
+import net.sourceforge.pmd.lang.swift.antlr4.SwiftParser;
+
+/**
+ * Adapter for the SwiftParser.
+ */
+public class SwiftParserAdapter extends AntlrBaseParser {
+
+    public SwiftParserAdapter(final ParserOptions parserOptions) {
+        super(parserOptions);
+    }
+
+    @Override
+    protected Lexer getLexer(final Reader source) throws IOException {
+        return new SwiftLexer(CharStreams.fromReader(source));
+    }
+
+    @Override
+    protected Parser getParser(final Lexer lexer) {
+        return new SwiftParser(new CommonTokenStream(lexer));
+    }
+
+    @Override
+    public boolean canParse() {
+        return true;
+    }
+}