From 485fe60b9838708a07b1d1af7054c729cfa9bbf5 Mon Sep 17 00:00:00 2001
From: Jan Tuomi <jans.tuomi@gmail.com>
Date: Tue, 21 Jun 2016 22:28:38 +0300
Subject: Add builtin function 'concat'

---
 main/core/runtime/builtins/BuiltinManager.java     |  1 +
 .../runtime/builtins/ConcatBuiltinFunction.java    | 38 ++++++++++++++++++++++
 test/resources/program.bork                        |  2 +-
 3 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 main/core/runtime/builtins/ConcatBuiltinFunction.java

diff --git a/main/core/runtime/builtins/BuiltinManager.java b/main/core/runtime/builtins/BuiltinManager.java
index e001cda..a16d8e9 100644
--- a/main/core/runtime/builtins/BuiltinManager.java
+++ b/main/core/runtime/builtins/BuiltinManager.java
@@ -20,6 +20,7 @@ public class BuiltinManager {
     private BuiltinManager() {
         builtins.add(new OutBuiltinFunction());
         builtins.add(new InBuiltinFunction());
+        builtins.add(new ConcatBuiltinFunction());
     }
 
     public List<Function> getBuiltins() {
diff --git a/main/core/runtime/builtins/ConcatBuiltinFunction.java b/main/core/runtime/builtins/ConcatBuiltinFunction.java
new file mode 100644
index 0000000..5f87a38
--- /dev/null
+++ b/main/core/runtime/builtins/ConcatBuiltinFunction.java
@@ -0,0 +1,38 @@
+package com.jantuomi.interpreter.main.core.runtime.builtins;
+
+import com.jantuomi.interpreter.main.core.parser.datatype.DataContainer;
+import com.jantuomi.interpreter.main.core.parser.datatype.StringDataContainer;
+import com.jantuomi.interpreter.main.core.runtime.Function;
+import com.jantuomi.interpreter.main.exception.InterpreterException;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Created by jan on 21.6.2016.
+ */
+public class ConcatBuiltinFunction extends Function {
+    public ConcatBuiltinFunction() {
+        super(
+                Arrays.asList("strings"),
+                null
+        );
+    }
+
+    @Override
+    public String getName() {
+        return "concat";
+    }
+
+    @Override
+    public DataContainer evaluate(List<DataContainer> params) throws InterpreterException {
+        StringBuilder sb = new StringBuilder();
+        for (DataContainer d : params) {
+            sb.append(d.getData());
+        }
+
+        return new StringDataContainer(
+                sb.toString()
+        );
+    }
+}
diff --git a/test/resources/program.bork b/test/resources/program.bork
index 8159939..0901bd7 100644
--- a/test/resources/program.bork
+++ b/test/resources/program.bork
@@ -14,7 +14,7 @@ sum(x y)
 
 decl user_input
 set user_input in("give input: ")
-out( + + "your input was " user_input "!" )
+out( concat("your input was: " user_input "!") )
 
 decl var
 set var true
-- 
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