#236: Basic, compiling and failing tests for the CurrentIndex ValueEx…

…pression.

core/src/main/java/io/parsingdata/metal/Shorthand.java

@@ -44,6 +44,7 @@
 import io.parsingdata.metal.expression.value.Cat;
 import io.parsingdata.metal.expression.value.Const;
 import io.parsingdata.metal.expression.value.ConstantFactory;
+import io.parsingdata.metal.expression.value.reference.CurrentIndex;
 import io.parsingdata.metal.expression.value.Elvis;
 import io.parsingdata.metal.expression.value.Expand;
 import io.parsingdata.metal.expression.value.FoldLeft;
@@ -89,6 +90,7 @@ public final class Shorthand {
     public static final Token EMPTY = def(EMPTY_NAME, 0L);
     public static final ValueExpression SELF = new Self();
     public static final ValueExpression CURRENT_OFFSET = new CurrentOffset();
+    public static final ValueExpression CURRENT_INDEX = new CurrentIndex();
     public static final Expression TRUE = new True();
 
     private Shorthand() {}

core/src/main/java/io/parsingdata/metal/expression/value/reference/CurrentIndex.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2013-2016 Netherlands Forensic Institute
+ *
+ * Licensed 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 io.parsingdata.metal.expression.value.reference;
+
+import java.util.Optional;
+
+import io.parsingdata.metal.Util;
+import io.parsingdata.metal.data.ImmutableList;
+import io.parsingdata.metal.data.ParseState;
+import io.parsingdata.metal.encoding.Encoding;
+import io.parsingdata.metal.expression.value.Value;
+import io.parsingdata.metal.expression.value.ValueExpression;
+
+/**
+ * A {@link ValueExpression} that represents the current index in an iteration
+ * (e.g. when inside a {@link io.parsingdata.metal.token.Rep} or
+ * {@link io.parsingdata.metal.token.RepN}).
+ */
+public class CurrentIndex implements ValueExpression {
+
+    @Override
+    public ImmutableList<Optional<Value>> eval(final ParseState parseState, final Encoding encoding) {
+        return null;
+    }
+
+    @Override
+    public String toString() {
+        return getClass().getSimpleName();
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        return Util.notNullAndSameClass(this, obj);
+    }
+
+    @Override
+    public int hashCode() {
+        return getClass().hashCode();
+    }
+
+}

core/src/test/java/io/parsingdata/metal/expression/value/reference/CurrentIndexTest.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2013-2016 Netherlands Forensic Institute
+ *
+ * Licensed 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 io.parsingdata.metal.expression.value.reference;
+
+import static io.parsingdata.metal.Shorthand.CURRENT_INDEX;
+import static io.parsingdata.metal.Shorthand.con;
+import static io.parsingdata.metal.Shorthand.def;
+import static io.parsingdata.metal.Shorthand.eq;
+import static io.parsingdata.metal.Shorthand.rep;
+import static io.parsingdata.metal.Shorthand.repn;
+import static io.parsingdata.metal.Shorthand.seq;
+import static io.parsingdata.metal.util.EncodingFactory.enc;
+import static io.parsingdata.metal.util.ParseStateFactory.stream;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import org.junit.runners.Parameterized;
+
+import io.parsingdata.metal.token.Token;
+import io.parsingdata.metal.util.ParameterizedParse;
+
+public class CurrentIndexTest extends ParameterizedParse {
+
+    public static final Token VALUE_EQ_INDEX = def("value", con(1), eq(CURRENT_INDEX));
+
+    @Parameterized.Parameters(name="{0} ({4})")
+    public static Collection<Object[]> data() {
+        return Arrays.asList(new Object[][] {
+            { "[0, 1, 2, 3] rep(CURRENT_INDEX)", rep(VALUE_EQ_INDEX), stream(0, 1, 2, 3), enc(), true },
+            { "[0, 1, 2, 3] repn(4, CURRENT_INDEX)", repn(VALUE_EQ_INDEX, con(4)), stream(0, 1, 2, 3), enc(), true },
+            { "[0, 1, 2, 3] seq(CURRENT_INDEX, ...)", seq(VALUE_EQ_INDEX, VALUE_EQ_INDEX, VALUE_EQ_INDEX, VALUE_EQ_INDEX), stream(0, 1, 2, 3), enc(), true }
+        });
+    }
+
+}