wip work for join

Author: erkkikeranen

src/clojure_string.rs

@@ -1 +1,2 @@
 pub (crate) mod reverse;
+pub (crate) mod join;

src/clojure_string/join.rs

@@ -0,0 +1,48 @@
+use crate::ifn::IFn;
+use crate::value::{ToValue, Value};
+use std::rc::Rc;
+
+use crate::error_message;
+use crate::type_tag::TypeTag;
+
+/// clojure.string/reverse ; reverses a string
+/// (defn print-string [string] .. prints single string .. )
+#[derive(Debug, Clone)]
+pub struct JoinFn {}
+impl ToValue for JoinFn {
+ fn to_value(&self) -> Value {
+ Value::IFn(Rc::new(self.clone()))
+ }
+}
+impl IFn for JoinFn {
+ fn invoke(&self, args: Vec<Rc<Value>>) -> Value {
+ if args.len() == 1 {
+ match args.get(0).unwrap().to_value() {
+ Value::Iseq(s) => Value::String(s.chars().rev().collect()),
+ _a => error_message::type_mismatch(TypeTag::String, &_a.to_value())
+ }
+
+ } else {
+ return error_message::wrong_arg_count(2, args.len());
+
+ }
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ mod reverse_tests {
+ use crate::value::Value;
+ use std::rc::Rc;
+ use crate::clojure_string::reverse::JoinFn;
+ use crate::ifn::IFn;
+
+ #[test]
+ fn reverse_string() {
+ let reverse = JoinFn {};
+ let s = "hello";
+ let args = vec![Rc::new(Value::String(String::from(s)))];
+ assert_eq!(Value::String(String::from("olleh")), reverse.invoke(args));
+ }
+ }
+}