Merge pull request #8 from sebinsaji007/lib-feature

added random library

Author: AlenVelocity

src/std_library/mod.rs

@@ -6,6 +6,7 @@ pub mod array;
 pub mod fs;
 pub mod string;
 pub mod math;
+pub mod random;
 /// Function to load a standard library 
 /// # Arguments
 /// * `lib` - The name of the library to load.
@@ -23,6 +24,7 @@ pub fn get_std_lib(lib: String) -> Option<Res> {
         "nya:whiskers" => Some(string::add_globals()),
         "nya:scratchpad" => Some(fs::add_globals()),
         "nya:catculator" => Some(math::add_globals()),
+        "nya:rundamn" => Some(random::add_globals()),
         //"nya:meowternet" => Some(http::add_globals()),
         _ => None,
     }

src/std_library/random.rs

@@ -0,0 +1,51 @@
+extern crate rand;
+use rand::seq::SliceRandom;
+use rand::Rng;
+
+
+pub fn add_globals() -> Res {
+    let mut globals = HashMap::new();
+    globals.insert(String::from("new"), Object::Inbuilt(new));
+    globals.insert(String::from("random"), Object::Inbuilt(random));
+    globals.insert(String::from("uniform"), Object::Inbuilt(uniform));
+    globals.insert(String::from("randint"), Object::Inbuilt(randint));
+    globals.insert(String::from("choice"), Object::Inbuilt(choice));
+    globals.insert(String::from("shuffle"), Object::Inbuilt(shuffle));
+
+
+    Res {
+        globals,
+        raw: None,
+    }
+}
+pub struct SimpleRandom {
+    rng: rand::rngs::ThreadRng,
+}
+
+impl SimpleRandom {
+    pub fn new() -> Self {
+        SimpleRandom { rng: rand::thread_rng() }
+    }
+
+    pub fn random(&mut self) -> f64 {
+        self.rng.gen::<f64>()
+    }
+
+    pub fn uniform(&mut self, a: f64, b: f64) -> f64 {
+        self.rng.gen_range(a..b)
+    }
+
+    pub fn randint(&mut self, a: i64, b: i64) -> i64 {
+        self.rng.gen_range(a..=b)
+    }
+
+    pub fn choice<T: Clone>(&mut self, seq: &[T]) -> T {
+        seq.choose(&mut self.rng).unwrap().clone()
+    }
+
+    pub fn shuffle<T>(&mut self, x: &mut Vec<T>) {
+        x.shuffle(&mut self.rng);
+    }
+}
+
+