1 files changed, 27 insertions, 0 deletions

diff --git a/chunk.d b/chunk.d
index 68df45b..b6a5348 100644
--- a/chunk.d
+++ b/chunk.d
@@ -47,6 +47,7 @@ abstract class Seq {
     abstract Seq rest();
     abstract int length();
     abstract Seq concat(Seq seq);
+    abstract bool isIn(Value val);
 }
 
 class String : Seq {
@@ -87,6 +88,22 @@ class String : Seq {
         return new String(this.str ~ strSeq.str);
     }
 
+    override bool isIn(Value val) {
+        if (val.type != ValueType.SEQ) {
+            // how do i throw an error here?
+            writeln("a non-string can't be 'in?' a string (this should be a compile error)");
+            return false;
+        }
+        Seq seq = val.as.seq;
+        if (seq.type != SeqType.STRING) {
+            // how do i throw an error here?
+            writeln("a non-string can't be 'in?' a string (this should be a compile error)");
+            return false;
+        }
+        String strVal = cast(String)seq;
+        return (indexOf(this.str, strVal.str) != -1);
+    }
+
     override string toString() {
         return format("\"%s\"", this.str);
     }
@@ -130,6 +147,15 @@ class List : Seq {
         return ret;
     }
 
+    override bool isIn(Value val) {
+        foreach(Value mine ; this.inner) {
+            if (areValuesEqual(mine, val)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     override string toString() {
         return format("list ('%s' + %d)", printableValue(this.inner[0]), this.inner.length - 1);
     }
@@ -169,6 +195,7 @@ enum OpCode {
     OP_FIRST,   // No?
     OP_REST,
     OP_LENGTH,
+    OP_MEMBER,
 
     OP_TYPE_CHECK_NUMBER,
     OP_TYPE_CHECK_BOOLEAN,