Add a specialized token factory

[yangtools.git] / yang / yang-parser-rfc7950 / src / main / java / org / opendaylight / yangtools / yang / parser / rfc7950 / antlr / AbstractSourceToken.java

diff --git a/yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/antlr/AbstractSourceToken.java b/yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/antlr/AbstractSourceToken.java
new file mode 100644 (file)
index 0000000..fc2bdc8
--- /dev/null
+++ b/yang/yang-parser-rfc7950/src/main/java/org/opendaylight/yangtools/yang/parser/rfc7950/antlr/AbstractSourceToken.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2020 PANTHEON.tech, s.r.o. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.yangtools.yang.parser.rfc7950.antlr;
+
+import static java.util.Objects.requireNonNull;
+
+import org.antlr.v4.runtime.CharStream;
+import org.antlr.v4.runtime.TokenSource;
+import org.antlr.v4.runtime.misc.Interval;
+import org.antlr.v4.runtime.misc.Pair;
+
+abstract class AbstractSourceToken extends AbstractToken {
+    private final Pair<TokenSource, CharStream> source;
+
+    AbstractSourceToken(final Pair<TokenSource, CharStream> source) {
+        this.source = requireNonNull(source);
+    }
+
+    @Override
+    public final TokenSource getTokenSource() {
+        return source.a;
+    }
+
+    @Override
+    public final CharStream getInputStream() {
+        return source.b;
+    }
+
+    @Override
+    public final String getText() {
+        final CharStream input = getInputStream();
+        if (input == null) {
+            return null;
+        }
+
+        final int n = input.size();
+        final int start = getStartIndex();
+        final int stop = getStopIndex();
+        return start < n && stop < n ? input.getText(Interval.of(start, stop)) : "<EOF>";
+    }
+}