Add custom types. Make an attempt at method calls.

You just need to implement `CustomValue`, `Debug` and `Clone`
for your own types, and the type can be used in your code.

Next on the list: method calls (e.g. x.y(), instead of y(x))

Cargo.lock

@@ -44,6 +44,12 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "dyn-clone"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "140206b78fb2bc3edbcfc9b5ccbd0b30699cfe8d348b8b31b330e47df5291a5a"
+
 [[package]]
 name = "fake-simd"
 version = "0.1.2"
@@ -148,6 +154,7 @@ dependencies = [
 name = "sunflower"
 version = "0.1.0"
 dependencies = [
+ "dyn-clone",
  "pest",
  "pest_derive",
 ]

Cargo.toml

@@ -6,6 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+dyn-clone = "1.0.6"
 
 pest = "2.1.3"
 pest_derive = "2.1.0"

src/expression.rs

@@ -43,6 +43,7 @@ pub enum Expression {
     Constant(Value),
     Variable(String),
     Call(String, Vec<Expression>),
+    CallMethod(Box<Expression>, String, Vec<Expression>),
     Binary(Box<Expression>, BinaryOperation, Box<Expression>),
 }
 
@@ -58,6 +59,17 @@ impl Expression {
                     &args.iter().map(|ex| ex.eval(e, f)).collect::<Vec<_>>(),
                 )
                 .unwrap(),
+            Expression::CallMethod(target, name, args) => {
+                let target = target.eval(e, f);
+                let v = vec![target.clone()];
+                let args = v
+                    .iter()
+                    .cloned()
+                    .chain(args.iter().map(|ex| ex.eval(e, f)))
+                    .collect::<Vec<_>>();
+
+                target.call_method(name, e, f, &args)
+            }
             Expression::Binary(lhs, op, rhs) => {
                 let lhs = lhs.eval(e, f);
                 let rhs = rhs.eval(e, f);
@@ -179,4 +191,29 @@ mod tests {
             Value::Int(20)
         );
     }
+
+    #[test]
+    fn eq_method_test() {
+        let f = FunctionMap::new();
+        let e = Env::new();
+        e.set("test", 10);
+        assert_eq!(
+            Expression::CallMethod(
+                Box::new(Expression::Variable("test".to_string())),
+                "eq".to_string(),
+                vec![Expression::Constant(Value::Int(10))]
+            )
+            .eval(&e, &f),
+            Value::Bool(true)
+        );
+        assert_eq!(
+            Expression::CallMethod(
+                Box::new(Expression::Variable("test".to_string())),
+                "eq".to_string(),
+                vec![Expression::Constant(Value::Int(11))]
+            )
+            .eval(&e, &f),
+            Value::Bool(false)
+        );
+    }
 }

src/grammar.pest

@@ -1,4 +1,5 @@
 WHITESPACE = _{ " " | "\t" | NEWLINE }
+COMMENT = _{ "/*" ~ (!"*/" ~ ANY)* ~ "*/" | "//" ~ (!NEWLINE ~  ANY)* }
 
 number = @{
     "-"?
@@ -21,7 +22,7 @@ char = ${ "\'" ~ character ~ "\'" }
 
 boolean = { "true" | "false" }
 
-identifier = @{ ASCII_ALPHA ~ ASCII_ALPHANUMERIC* }
+identifier = @{ ASCII_ALPHA ~ (ASCII_ALPHANUMERIC | "_" )* }
 
 call = ${
     identifier ~ call_params

src/main.rs

@@ -1,9 +1,9 @@
-use std::fs::read_to_string;
+use std::{any::Any, fs::read_to_string};
 
 use env::Env;
 use function::FunctionMap;
 use statement::Statement;
-use value::Value;
+use value::{custom::CustomValue, Value};
 
 mod env;
 mod expression;
@@ -20,6 +20,29 @@ fn run(functions: FunctionMap, statement: Statement) {
     statement.eval(&env, &functions);
 }
 
+#[derive(Clone, Debug, PartialEq, Eq)]
+struct Foo {
+    x: i32,
+}
+
+impl CustomValue for Foo {
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+
+    fn format(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Foo({})", self.x)
+    }
+
+    fn eq(&self, other: &Value) -> bool {
+        if let Some(v) = other.as_t() {
+            self == v
+        } else {
+            false
+        }
+    }
+}
+
 fn main() {
     let f = read_to_string("./test.foo").unwrap();
     let (res, funcs) = pest_parser::parse(f);
@@ -29,5 +52,11 @@ fn main() {
         println!("{}", a);
     });
     m.insert_native("waluigi", || "Waluigi");
+    m.insert_native("native_test", || Foo { x: 41 });
+    m.insert_native("edit_foo", |f: &Foo| {
+        let mut f = f.clone();
+        f.x += 1;
+        f
+    });
     run(m, res);
 }

src/pest_parser.rs

@@ -138,7 +138,20 @@ fn handle_rules(mut p: pest::iterators::Pairs<Rule>) -> (Statement, FuncHolder)
         match pair.as_rule() {
             Rule::expression => {
                 let mut inner = pair.into_inner();
-                parse_expression(inner.next().unwrap())
+                let expr = parse_expression(inner.next().unwrap());
+                if let Some(c) = inner.next() {
+                    let mut inner = c.into_inner();
+                    let name = inner.next().unwrap();
+                    let args = inner
+                        .next()
+                        .unwrap()
+                        .into_inner()
+                        .map(parse_expression)
+                        .collect();
+                    Expression::CallMethod(Box::new(expr), name.as_str().to_string(), args)
+                } else {
+                    expr
+                }
             }
             Rule::equality => {
                 let mut inner = pair.into_inner();

src/value.rs

@@ -1,15 +1,24 @@
 use std::{
+    any::Any,
+    cmp::Ordering,
     fmt::Display,
-    ops::{Add, Div, Mul, Sub, Rem},
+    ops::{Add, Div, Mul, Rem, Sub},
 };
 
-#[derive(Debug, Clone, PartialEq, Default)]
+use crate::{env::Env, function::FunctionMap};
+
+use self::custom::CustomValue;
+
+pub mod custom;
+
+#[derive(Debug, Clone, Default)]
 pub enum Value {
     Int(i32),
     Float(f32),
     String(String),
     Bool(bool),
     Char(char),
+    Custom(Box<dyn CustomValue>),
     #[default]
     Nothing,
     Error,
@@ -25,22 +34,84 @@ impl Value {
             Value::String(v) => !v.is_empty(),
             Value::Bool(v) => *v,
             Value::Char(v) => *v != '\0',
+            Value::Custom(_) => false,
             Value::Nothing => false,
             Value::Error => false,
         }
     }
 
-    pub fn value_kind(&self) -> &'static str {
+    pub fn value_kind(&self) -> &str {
         match self {
             Value::Int(_) => "int",
             Value::Float(_) => "float",
             Value::String(_) => "string",
             Value::Bool(_) => "bool",
             Value::Char(_) => "char",
+            Value::Custom(c) => c.value_kind(),
             Value::Nothing => "nothing",
             Value::Error => "error",
         }
     }
+
+    pub fn as_any(&self) -> &dyn Any {
+        match self {
+            Value::Int(i) => i,
+            Value::Float(f) => f,
+            Value::String(s) => s,
+            Value::Bool(b) => b,
+            Value::Char(c) => c,
+            Value::Custom(c) => c.as_any(),
+            Value::Nothing => &() as &dyn Any,
+            Value::Error => &() as &dyn Any,
+        }
+    }
+
+    pub fn as_t<T>(&self) -> Option<&T>
+    where
+        T: Any + 'static,
+    {
+        self.as_any().downcast_ref::<T>()
+    }
+
+    pub fn value_functions() -> FunctionMap {
+        let mut map = FunctionMap::new();
+        map.insert_native("eq", Self::eq);
+        map.insert_native("ne", Self::ne);
+        map.insert_native("lt", Self::lt);
+        map.insert_native("le", Self::le);
+        map.insert_native("gt", Self::gt);
+        map.insert_native("ge", Self::ge);
+
+        map
+    }
+
+    pub fn inner_functions(&self) -> Option<&FunctionMap> {
+        if let Self::Custom(c) = self {
+            c.functions()
+        } else {
+            None
+        }
+    }
+
+    pub fn call_method(
+        &self,
+        name: &str,
+        env: &Env,
+        _global_functions: &FunctionMap,
+        args: &[Value],
+    ) -> Value {
+        if let Some(i) = self.inner_functions() {
+            match i.call(name, env, args) {
+                Ok(r) => return r,
+                Err(e) => println!("{}", e),
+            }
+        }
+        match Value::value_functions().call(name, env, args) {
+            Ok(r) => return r,
+            Err(e) => println!("{}", e),
+        }
+        Value::Nothing
+    }
 }
 
 macro_rules! math_trait {
@@ -66,19 +137,24 @@ math_trait!(Rem, rem);
 
 impl Display for Value {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(
-            f,
-            "{}",
-            match self {
-                Value::Int(v) => v.to_string(),
-                Value::Float(v) => v.to_string(),
-                Value::String(v) => v.clone(),
-                Value::Bool(v) => v.to_string(),
-                Value::Char(v) => v.to_string(),
-                Value::Nothing => "()".to_string(),
-                Value::Error => "Error".to_string(),
-            }
-        )
+        if let Value::Custom(c) = self {
+            c.format(f)
+        } else {
+            write!(
+                f,
+                "{}",
+                match self {
+                    Value::Int(v) => v.to_string(),
+                    Value::Float(v) => v.to_string(),
+                    Value::String(v) => v.clone(),
+                    Value::Bool(v) => v.to_string(),
+                    Value::Char(v) => v.to_string(),
+                    Value::Nothing => "()".to_string(),
+                    Value::Error => "Error".to_string(),
+                    _ => unreachable!(),
+                }
+            )
+        }
     }
 }
 
@@ -119,6 +195,21 @@ impl FromValue for Value {
     }
 }
 
+impl<T: 'static + CustomValue> FromValue for T {
+    fn from_value(v: &Value) -> Option<&Self> {
+        match v {
+            Value::Custom(v) => v.as_any().downcast_ref(),
+            _ => None,
+        }
+    }
+}
+
+impl<T: CustomValue> From<T> for Value {
+    fn from(v: T) -> Self {
+        Value::Custom(v.clone_box())
+    }
+}
+
 from_impl!(i32 => Int, f32 => Float, String => String, bool => Bool, char => Char);
 
 impl From<&'_ str> for Value {
@@ -136,6 +227,23 @@ impl FromValue for str {
     }
 }
 
+impl PartialEq for Value {
+    fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (Value::Int(lhs), Value::Int(rhs)) => lhs == rhs,
+            (Value::Float(lhs), Value::Float(rhs)) => lhs == rhs,
+            (Value::String(lhs), Value::String(rhs)) => lhs == rhs,
+            (Value::Bool(lhs), Value::Bool(rhs)) => lhs == rhs,
+            (Value::Char(lhs), Value::Char(rhs)) => lhs == rhs,
+            (Value::Custom(lhs), other) => lhs.as_ref() == other,
+            (other, Value::Custom(rhs)) => rhs.as_ref() == other,
+            (Value::Nothing, Value::Nothing) => true,
+            (Value::Error, Value::Error) => true,
+            _ => false,
+        }
+    }
+}
+
 impl PartialOrd for Value {
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
         match (self, other) {
@@ -147,6 +255,8 @@ impl PartialOrd for Value {
             (Value::Nothing, Value::Nothing) => Some(std::cmp::Ordering::Equal),
             (Value::Int(lhs), Value::Float(rhs)) => (*lhs as f32).partial_cmp(rhs),
             (Value::Float(lhs), Value::Int(rhs)) => lhs.partial_cmp(&(*rhs as f32)),
+            (Value::Custom(lhs), other) => lhs.as_ref().partial_cmp(other),
+            (other, Value::Custom(rhs)) => rhs.as_ref().partial_cmp(other).map(Ordering::reverse),
             _ => None,
         }
     }

src/value/custom.rs

@@ -0,0 +1,72 @@
+use crate::function::FunctionMap;
+
+use super::Value;
+
+fn type_name_of_val<T: ?Sized>(_val: &T) -> &'static str {
+    std::any::type_name::<T>()
+}
+
+pub trait CustomValue: std::fmt::Debug + BoxClone {
+    /// Cursed workaround. Since every type has to implement this
+    /// method, we can get a handle back to the type.
+    fn as_any(&self) -> &dyn std::any::Any;
+
+    fn value_kind(&self) -> &'static str {
+        type_name_of_val(self)
+    }
+
+    fn format(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{:?}", self)
+    }
+
+    fn eq(&self, _: &Value) -> bool {
+        false
+    }
+
+    fn ne(&self, other: &Value) -> bool {
+        !self.eq(other)
+    }
+
+    fn partial_cmp(&self, _: &Value) -> Option<std::cmp::Ordering> {
+        None
+    }
+
+    fn functions(&self) -> Option<&FunctionMap> {
+        None
+    }
+}
+
+impl PartialEq<Value> for dyn CustomValue {
+    fn eq(&self, other: &Value) -> bool {
+        self.eq(other)
+    }
+
+    fn ne(&self, other: &Value) -> bool {
+        self.ne(other)
+    }
+}
+
+impl PartialOrd<Value> for dyn CustomValue {
+    fn partial_cmp(&self, other: &Value) -> Option<std::cmp::Ordering> {
+        self.partial_cmp(other)
+    }
+}
+
+pub trait BoxClone {
+    fn clone_box(&self) -> Box<dyn CustomValue>;
+}
+
+impl<T> BoxClone for T
+where
+    T: 'static + CustomValue + Clone,
+{
+    fn clone_box(&self) -> Box<dyn CustomValue> {
+        Box::new(self.clone())
+    }
+}
+
+impl Clone for Box<dyn CustomValue> {
+    fn clone(&self) -> Self {
+        self.clone_box()
+    }
+}

test.foo

@@ -9,3 +9,11 @@ let x = 10;
 let y = x-5;
 
 print(y);
+print( edit_foo(native_test()) );
+
+// Parameter 0 was not of type sunflower::Foo, it was string
+// fancy error isn't it?
+// edit_foo("hello");
+
+// this doesnt work yet :((((
+// print(10.eq(20));