implement string length function

1 files changed, 5 insertions, 0 deletions

diff --git a/neb/std/strings.py b/neb/std/strings.py
index 7e3177e..0da64da 100644
--- a/neb/std/strings.py
+++ b/neb/std/strings.py
@@ -47,3 +47,8 @@ def interpretRestChar(symbol, args, env, ns):
     return String(args[0].value[1:])
 
 STRINGS.register("rest-char", Builtin("rest-char", interpretRestChar, [Arg("string", TypeEnum.STRING)], return_type=Type(":string")))
+
+def interpretLength(symbol, args, env, ns):
+    return Int(len(args[0].value))
+
+STRINGS.register("length", Builtin("length", interpretLength, [Arg("string", TypeEnum.STRING)], return_type=Type(":int")))