made the parser work

Cargo.lock

@@ -85,7 +85,7 @@ checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
 
 [[package]]
 name = "prout"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "chumsky",
 ]

Cargo.toml

@@ -1,9 +1,9 @@
 [package]
 name = "prout"
-version = "0.1.0"
+version = "0.2.0"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-chumsky = "0.8.0"
+chumsky = "0.8"

README.md

@@ -17,11 +17,11 @@ PROUT is a minimal programming language providing tools to automate file managem
 
 ```sh
 
-$ prout hello_world.pr
+$ prout hello-world.pr
 
 
 ```
 
-## Author
+## Authors
 
-- JOLIMAITRE Matthieu <matthieu@imagevo.fr>, developper
+- JOLIMAITRE Matthieu <matthieu@imagevo.fr>

examples/hello-world.pr

@@ -0,0 +1,36 @@
+
+hello: "hello";
+prout: "prout";
+
+line: hello;
+line <- add(line, " ");
+line <- add(line, prout);
+
+say-it: () => {
+    out(line)
+};
+
+say-it();
+
+
+for: (from, to, incr, fn) => {
+    index: from;
+    loop {
+        if not(inf(index, to)) break true;
+        result: fn(index);
+        index <- add(index, incr)
+    }
+};
+
+for(0, 3, 0.5, (index) => {
+    out(add("index: ", index))
+});
+
+
+a: 1;
+b: 2;
+c: 3;
+a <- b <- c;
+out(add("a :", a));
+out(add("b :", b));
+out(add("c :", c));

src/main.rs

@@ -1,3 +1,5 @@
+use std::{env::args, fs};
+
 pub mod execution_tree;
 pub mod prelude;
 pub mod runtime;
@@ -6,11 +8,14 @@ pub mod value;
 
 fn main() {
     use prelude::std_prelude;
-    let input = todo!();
+
-    // let parsed = syntax_tree::parser::Parser::parse(input);
+    let path = args().nth(1).expect("[error]: usage 'prout <path>'");
-    // let executable = execution_tree::parser::Parser::parse(parsed, |b| std_prelude(b));
+    let input = fs::read_to_string(path).expect("file not found");
-    // let runtime = runtime::Runtime::new();
+    let ast_parser = syntax_tree::parser::ParserWrapper::new();
-    // runtime.execute(&executable);
+    let parsed = ast_parser.parse(&input).unwrap();
+    let executable = execution_tree::parser::Parser::parse(parsed, |b| std_prelude(b));
+    let mut runtime = runtime::Runtime::new();
+    runtime.execute(&executable);
 }
 
 #[test]

src/prelude.rs

@@ -1,14 +1,146 @@
+use std::collections::HashMap;
+
 use crate::{
     execution_tree::parser::ParserBuilder,
     value::{function::Function, Value},
 };
 
 pub fn std_prelude(builder: &mut ParserBuilder) {
-    builder.prelude("print".into(), Function::new_native(1, print).into())
+    let functions: Vec<(_, _, fn(Vec<Value>) -> Value)> = vec![
+        ("out", 1, out),
+        ("add", 2, add),
+        ("sub", 2, sub),
+        ("eq", 2, eq),
+        ("sup", 2, sup),
+        ("inf", 2, inf),
+        ("and", 2, and),
+        ("or", 2, or),
+        ("not", 1, not),
+        ("str", 2, str),
+        ("obj", 0, obj),
+        ("set", 3, set),
+        ("get", 2, get),
+    ];
+
+    for (name, arg_count, closure) in functions {
+        builder.prelude(name.into(), Function::new_native(arg_count, closure).into());
+    }
 }
 
-fn print(args: Vec<Value>) -> Value {
+fn out(args: Vec<Value>) -> Value {
     let to_print = args.get(0).unwrap();
-    println!("{to_print:?}");
+    let str = value_to_string(to_print);
-    Value::Bool(true)
+    println!("{str}");
+    to_print.clone()
+}
+
+fn add(args: Vec<Value>) -> Value {
+    let lhs = args.get(0).unwrap();
+    let rhs = args.get(1).unwrap();
+    match (lhs, rhs) {
+        (Value::Number(l), Value::Number(r)) => (l + r).into(),
+        (Value::String(l), Value::String(r)) => format!("{l}{r}").into(),
+        (Value::Number(l), Value::String(r)) => format!("{l}{r}").into(),
+        (Value::String(l), Value::Number(r)) => format!("{l}{r}").into(),
+        _ => unreachable!(),
+    }
+}
+
+fn sub(args: Vec<Value>) -> Value {
+    let lhs = args.get(0).unwrap();
+    let rhs = args.get(1).unwrap();
+    match (lhs, rhs) {
+        (Value::Number(l), Value::Number(r)) => (l - r).into(),
+        _ => panic!("substracting non-numbers"),
+    }
+}
+
+fn eq(args: Vec<Value>) -> Value {
+    let lhs = args.get(0).unwrap();
+    let rhs = args.get(1).unwrap();
+    match (lhs, rhs) {
+        (Value::Bool(l), Value::Bool(r)) => (l == r).into(),
+        (Value::Number(l), Value::Number(r)) => (l == r).into(),
+        (Value::String(l), Value::String(r)) => (l == r).into(),
+        _ => panic!("comparing different types"),
+    }
+}
+
+fn sup(args: Vec<Value>) -> Value {
+    let lhs = args.get(0).unwrap();
+    let rhs = args.get(1).unwrap();
+    match (lhs, rhs) {
+        (Value::Number(l), Value::Number(r)) => (l > r).into(),
+        _ => panic!("comparing non-numeric"),
+    }
+}
+
+fn inf(args: Vec<Value>) -> Value {
+    let lhs = args.get(0).unwrap();
+    let rhs = args.get(1).unwrap();
+    match (lhs, rhs) {
+        (Value::Number(l), Value::Number(r)) => (l < r).into(),
+        _ => panic!("comparing non-numeric"),
+    }
+}
+
+fn and(args: Vec<Value>) -> Value {
+    let lhs = args.get(0).unwrap();
+    let rhs = args.get(1).unwrap();
+    match (lhs, rhs) {
+        (Value::Bool(l), Value::Bool(r)) => (*l && *r).into(),
+        _ => panic!("intersection of non-boolean"),
+    }
+}
+
+fn or(args: Vec<Value>) -> Value {
+    let lhs = args.get(0).unwrap();
+    let rhs = args.get(1).unwrap();
+    match (lhs, rhs) {
+        (Value::Bool(l), Value::Bool(r)) => (*l || *r).into(),
+        _ => panic!("union of non-boolean"),
+    }
+}
+
+fn not(args: Vec<Value>) -> Value {
+    let input = args.get(0).unwrap();
+    let result = !input.as_bool().expect("complementing non-bool");
+    result.into()
+}
+
+fn value_to_string(input: &Value) -> String {
+    match input {
+        Value::None => "None".to_string(),
+        Value::Bool(b) => format!("{b}"),
+        Value::Number(n) => format!("{n}"),
+        Value::String(s) => s.clone(),
+        Value::Object(_) => "[object]".into(),
+        Value::Function(_) => "[function]".into(),
+    }
+}
+
+fn str(args: Vec<Value>) -> Value {
+    let input = args.get(0).unwrap();
+    value_to_string(input).into()
+}
+
+fn obj(_: Vec<Value>) -> Value {
+    Value::Object(HashMap::new())
+}
+
+fn set(mut args: Vec<Value>) -> Value {
+    let name = args.get(1).unwrap().as_string().unwrap().to_string();
+    let value = args.get(2).unwrap().clone();
+    let object = args.get_mut(0).unwrap().as_object_mut().unwrap();
+    object.insert(name, value.clone());
+    value
+}
+
+fn get(args: Vec<Value>) -> Value {
+    let object = args.get(0).unwrap().as_object().unwrap();
+    let name = args.get(1).unwrap().as_string().unwrap();
+    object
+        .get(name)
+        .map(|value| value.clone())
+        .unwrap_or_else(|| false.into())
 }

src/runtime.rs

@@ -29,7 +29,7 @@ impl FrameBuilder {
 }
 
 pub struct Frame {
-    scope_id: Id,
+    _scope_id: Id,
     variables: HashMap<Id, Value>,
 }
 
@@ -54,7 +54,7 @@ impl Frame {
         let FrameBuilder { variables } = frame_builder;
         let scope_id = scope_id.clone();
         Self {
-            scope_id,
+            _scope_id: scope_id,
             variables,
         }
     }

src/syntax_tree/parser.rs

@@ -1,20 +1,47 @@
-use chumsky::prelude::*;
-
 use super::*;
+use chumsky::{prelude::*, text::whitespace};
 
-pub fn scope_parser() -> impl Parser<char, Scope, Error = Simple<char>> {
+pub trait AbstractParser<T>: Parser<char, T, Error = Simple<char>> {}
-    expression_parser()
+
-        .chain(
+impl<T, U: Parser<char, T, Error = Simple<char>>> AbstractParser<T> for U {}
-            just(';')
+
-                .padded()
+pub fn debugging_expression_parser() -> impl AbstractParser<Expr> + Clone {
-                .ignore_then(expression_parser())
+    variable_call_parser().padded().map(|v| v.into())
-                .repeated(),
-        )
-        .delimited_by(just('{'), just('}'))
-        .map(|instructions| Scope { instructions })
 }
 
-pub fn literal_value() -> impl Parser<char, Value, Error = Simple<char>> {
+pub fn scope_parser(expression: impl AbstractParser<Expr> + Clone) -> impl AbstractParser<Scope> {
+    let open_list = expression.separated_by(just(';'));
+    let closed_list = open_list.clone().then_ignore(just(';').then(whitespace()));
+    open_list
+        .map(|instructions| Scope { instructions })
+        .or(closed_list.map(|mut instructions| {
+            instructions.push(Value::None.into());
+            Scope { instructions }
+        }))
+        .padded()
+        .delimited_by(just('{'), just('}'))
+}
+
+#[test]
+fn test_scope_parser() {
+    let parser = scope_parser(debugging_expression_parser());
+    let value = parser.parse("{ arbre }");
+    dbg!(value.unwrap());
+}
+
+// TODO: add objects ?
+pub fn literal_value() -> impl AbstractParser<Value> {
+    let bool = just("false")
+        .map(|_| false.into())
+        .or(just("true").map(|_| true.into()));
+
+    let none = just("none").map(|_| Value::None);
+
+    let string = just('\"')
+        .ignore_then(none_of("\"").repeated())
+        .then_ignore(just('\"'))
+        .map(|v| String::from_iter(&v).into());
+
     let frac = just('.').chain(text::digits(10));
     let number = just('-')
         .or_not()
@@ -22,105 +49,346 @@ pub fn literal_value() -> impl Parser<char, Value, Error = Simple<char>> {
         .chain::<char, _, _>(frac.or_not().flatten())
         .collect::<String>()
         .from_str()
-        .unwrapped();
+        .unwrapped()
-    let literal = number.clone().map(|n| Value::Number(n)); // TODO: add other types
+        .map(|n: f64| n.into());
+
+    let literal = bool.or(none).or(string).or(number);
     literal
 }
 
-pub fn name() -> impl Parser<char, String, Error = Simple<char>> {
+#[test]
-    let name = just('a')
+fn test_literal_value() {
-        .or(just('b'))
+    let parser = literal_value();
-        .or(just('c'))
+    let value = parser.parse("5");
-        .or(just('d'))
+    assert_eq!(value.unwrap().as_number().unwrap(), 5.);
-        .or(just('e'))
+}
-        .or(just('f'))
+
-        .or(just('g'))
+pub fn name() -> impl AbstractParser<String> + Clone {
-        .or(just('h'))
+    let first = one_of("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
-        .or(just('i'))
+    let rest = first.clone().or(one_of("1234567890-_+/*"));
-        .or(just('j'))
+    let name = first.then(rest.repeated()).map(|(f, v)| {
-        .or(just('k'))
+        let rest = String::from_iter(&v);
-        .or(just('l'))
+        format!("{f}{rest}")
-        .or(just('m'))
+    });
-        .or(just('n'))
-        .or(just('o'))
-        .or(just('p'))
-        .or(just('q'))
-        .or(just('r'))
-        .or(just('s'))
-        .or(just('t'))
-        .or(just('u'))
-        .or(just('v'))
-        .or(just('w'))
-        .or(just('x'))
-        .or(just('y'))
-        .or(just('z'))
-        .or(just('-'))
-        .or(just('_'))
-        .repeated()
-        .map(|v| String::from_iter(&v));
     name
 }
 
-pub fn variable_definition_parser() -> impl Parser<char, VarDef, Error = Simple<char>> {
+pub fn variable_definition_parser(
+    expression: impl AbstractParser<Expr>,
+) -> impl AbstractParser<VarDef> {
     name()
-        .padded()
+        .then_ignore(just(":").padded())
-        .then_ignore(just(":"))
+        .then(expression)
-        .padded()
-        .then(expression_parser())
         .map(|(name, value)| VarDef { name, value })
 }
 
-pub fn variable_assignement_parser() -> impl Parser<char, VarAssign, Error = Simpl<char>> {
+#[test]
-	expression_parser().then() name()
+fn test_variable_definition_parser() {
+    let parser = variable_definition_parser(debugging_expression_parser());
+    let value = parser.parse("a : b");
+    dbg!(value.unwrap());
 }
 
-pub fn expression_parser() -> impl Parser<char, Expr, Error = Simple<char>> {
+pub fn variable_assignement_parser(
-    let scope = scope_parser().map(|s| s.into());
+    expression: impl AbstractParser<Expr>,
-    let litteral = literal_value().map(|v| Expr::new_literal(v));
+) -> impl AbstractParser<VarAssign> {
-    let variable_definition = variable_definition_parser().map(|s| s.into());
+    name()
-    let variable_assignment;
+        .then_ignore(just("<-").padded())
-    let variable_call;
+        .then(expression)
-    let function_definition;
+        .map(|(name, value)| VarAssign { name, value })
-    let function_call;
-    let function_return;
-    let loop_;
-    let loop_break;
-    let condition;
-    scope
-        .or(litteral)
-        .or(variable_definition)
-        .or(variable_assignment)
-        .or(variable_call)
-        .or(function_definition)
-        .or(function_call)
-        .or(function_return)
-        .or(loop_)
-        .or(loop_break)
-        .or(condition)
 }
 
-pub fn parser() -> impl Parser<char, Program, Error = Simple<char>> {
+#[test]
-    let scope = expression_parser().chain(
+fn test_variable_assignement_parser() {
-        just(';')
+    let parser = variable_assignement_parser(debugging_expression_parser());
-            .padded()
+    let value = parser.parse("arbre <- expr");
-            .ignore_then(expression_parser())
+    dbg!(value.unwrap());
-            .repeated(),
+}
-    );
 
-    let program = scope
+pub fn variable_call_parser() -> impl AbstractParser<VarCall> + Clone {
-        .map(|instructions| {
+    name().map(|name| VarCall { name })
-            let body = Scope { instructions };
+}
-            Program { body }
+
+#[test]
+fn test_variable_call_parser() {
+    let parser = variable_call_parser();
+    let value = parser.parse("arbre");
+    assert_eq!(value.unwrap().name, "arbre".to_string());
+}
+
+pub fn function_definition_parser(
+    expression: impl AbstractParser<Expr> + Clone,
+) -> impl AbstractParser<FnDef> {
+    let parameters = name().separated_by(just(',').padded());
+    let body = scope_parser(expression);
+    parameters
+        .padded()
+        .delimited_by(just('('), just(')'))
+        .then_ignore(just("=>").padded())
+        .then(body)
+        .map(|(parameter_names, body)| FnDef {
+            body,
+            parameter_names,
         })
-        .then_ignore(end().recover_with(skip_then_retry_until([])));
+}
+
+#[test]
+fn test_function_definition_parser() {
+    let parser = function_definition_parser(debugging_expression_parser());
+    let value = parser.parse("(a) => { b }");
+    dbg!(value.unwrap());
+}
+
+pub fn function_call_parser(expression: impl AbstractParser<Expr>) -> impl AbstractParser<FnCall> {
+    let parameters = expression.separated_by(just(',').padded());
+    name()
+        .then(parameters.padded().delimited_by(just('('), just(')')))
+        .map(|(name, arguments)| FnCall { arguments, name })
+}
+
+#[test]
+fn test_function_call_parser() {
+    let parser = function_call_parser(debugging_expression_parser());
+    let value = parser.parse("f( a , b )");
+    dbg!(value.unwrap());
+}
+
+pub fn function_return_parser(expression: impl AbstractParser<Expr>) -> impl AbstractParser<FnRet> {
+    just("return")
+        .ignore_then(expression.or_not())
+        .map(|expr| expr.unwrap_or(From::<Value>::from(true.into())))
+        .map(|value| FnRet { value })
+}
+
+#[test]
+fn test_function_return_parser() {
+    let parser = function_return_parser(debugging_expression_parser());
+    let value = parser.parse("return  a");
+    dbg!(value.unwrap());
+}
+
+pub fn loop_parser(expression: impl AbstractParser<Expr> + Clone) -> impl AbstractParser<Loop> {
+    just("loop")
+        .then(whitespace())
+        .ignore_then(scope_parser(expression))
+        .map(|body| Loop { body })
+}
+
+#[test]
+fn test_loop_parser() {
+    let parser = loop_parser(debugging_expression_parser());
+    let value = parser.parse("loop { a}");
+    dbg!(value.unwrap());
+}
+
+pub fn loop_break_parser(expression: impl AbstractParser<Expr>) -> impl AbstractParser<LoopBr> {
+    just("break")
+        .ignore_then(just(" ").then(whitespace()).ignore_then(expression))
+        .map(|value| LoopBr { value })
+}
+
+#[test]
+fn test_loop_break_parser() {
+    let parser = loop_break_parser(debugging_expression_parser());
+    let value = parser.parse("break  a");
+    dbg!(value.unwrap());
+}
+
+pub fn condition_parser(
+    expression: impl AbstractParser<Expr> + Clone,
+) -> impl AbstractParser<Cond> {
+    just("if ")
+        .ignore_then(expression.clone())
+        .then(expression.clone())
+        .then(just("else ").ignore_then(expression.clone()).or_not())
+        .map(|((condition, arm_true), arm_false)| Cond {
+            condition,
+            arm_true,
+            arm_false,
+        })
+}
+
+#[test]
+fn test_condition_parser() {
+    let parser = condition_parser(debugging_expression_parser());
+    let value = parser.parse("if a t else f");
+    dbg!(value.unwrap());
+}
+
+fn sugar_parser(expression: impl AbstractParser<Expr> + Clone) -> impl AbstractParser<Expr> {
+    let add = expression
+        .clone()
+        .then_ignore(just(" + "))
+        .then(expression.clone())
+        .map(|(l, r)| {
+            FnCall {
+                name: "add".into(),
+                arguments: vec![l, r],
+            }
+            .into()
+        });
+
+    let sub = expression
+        .clone()
+        .then_ignore(just(" - "))
+        .then(expression.clone())
+        .map(|(l, r)| {
+            FnCall {
+                name: "sub".into(),
+                arguments: vec![l, r],
+            }
+            .into()
+        });
+
+    let eq = expression
+        .clone()
+        .then_ignore(just(" == "))
+        .then(expression.clone())
+        .map(|(l, r)| {
+            FnCall {
+                name: "eq".into(),
+                arguments: vec![l, r],
+            }
+            .into()
+        });
+
+    let sup = expression
+        .clone()
+        .then_ignore(just(" > "))
+        .then(expression.clone())
+        .map(|(l, r)| {
+            FnCall {
+                name: "sup".into(),
+                arguments: vec![l, r],
+            }
+            .into()
+        });
+
+    let inf = expression
+        .clone()
+        .then_ignore(just(" < "))
+        .then(expression.clone())
+        .map(|(l, r)| {
+            FnCall {
+                name: "inf".into(),
+                arguments: vec![l, r],
+            }
+            .into()
+        });
+
+    let or = expression
+        .clone()
+        .then_ignore(just(" || "))
+        .then(expression.clone())
+        .map(|(l, r)| {
+            FnCall {
+                name: "or".into(),
+                arguments: vec![l, r],
+            }
+            .into()
+        });
+
+    let and = expression
+        .clone()
+        .then_ignore(just(" && "))
+        .then(expression.clone())
+        .map(|(l, r)| {
+            FnCall {
+                name: "and".into(),
+                arguments: vec![l, r],
+            }
+            .into()
+        });
+
+    eq.or(add).or(sub).or(sup).or(inf).or(or).or(and)
+}
+
+pub fn expression_parser() -> impl AbstractParser<Expr> {
+    let expression = recursive(|expression| {
+        //let sugar = sugar_parser(expression.clone());
+        let condition = condition_parser(expression.clone()).map(|i| i.into());
+        let function_definition = function_definition_parser(expression.clone()).map(|i| i.into());
+        let function_return = function_return_parser(expression.clone()).map(|i| i.into());
+        let loop_ = loop_parser(expression.clone()).map(|i| i.into());
+        let loop_break = loop_break_parser(expression.clone()).map(|i| i.into());
+        let scope = scope_parser(expression.clone()).map(|i| i.into());
+        let litteral = literal_value().map(|v| Expr::new_literal(v));
+        let variable_definition = variable_definition_parser(expression.clone()).map(|i| i.into());
+        let variable_assignment = variable_assignement_parser(expression.clone()).map(|i| i.into());
+        let function_call = function_call_parser(expression.clone()).map(|i| i.into());
+        let variable_call = variable_call_parser().map(|i| i.into());
+
+        //sugar
+        //    .or(condition)
+        condition
+            .or(function_definition)
+            .or(function_return)
+            .or(loop_)
+            .or(loop_break)
+            .or(scope)
+            .or(litteral)
+            .or(variable_definition)
+            .or(variable_assignment)
+            .or(function_call)
+            .or(variable_call)
+            .padded()
+    });
+    expression
+}
+
+#[test]
+fn test_expression_parser() {
+    let text = r##"if a b"##;
+    let parser = expression_parser();
+    let value = parser.parse(text);
+    dbg!(value.unwrap());
+}
+
+fn parser() -> impl AbstractParser<Program> {
+    let scope = expression_parser()
+        .separated_by(just(';').padded())
+        .then_ignore(just(';').padded().or_not())
+        .then_ignore(end());
+    let program = scope.map(|instructions| {
+        let body = Scope { instructions };
+        Program { body }
+    });
     program
 }
 
-// impl Parser {
+#[test]
-//     pub fn parse(input: &str) -> Program {
+fn test_parser() {
-//         todo!()
+    let example = r##"
-//     }
+print(3);
-// }
+
+a: 3;
+
+b: (a) => {
+    print("a")
+};
+
+f(a)
+
+"##;
+    let parser = parser();
+    let e = parser.parse(example);
+    dbg!(e.unwrap());
+}
+
+pub struct ParserWrapper {
+    inner: Box<dyn AbstractParser<Program>>,
+}
+
+impl ParserWrapper {
+    pub fn new() -> Self {
+        let inner = Box::new(parser());
+        ParserWrapper { inner }
+    }
+
+    pub fn parse<'i>(&self, input: &'i str) -> Result<Program, Vec<Simple<char>>> {
+        self.inner.parse(input)
+    }
+}
 
 /*
 // example
@@ -137,7 +405,7 @@ loop {
     if a <= 0 {
         break true
     } else {
-        a - 1 -> a
+        a <- a - 1
     }
 }
 

src/value.rs

@@ -2,7 +2,7 @@ use std::collections::HashMap;
 
 use self::function::Function;
 pub mod function {
-    use crate::execution_tree::{Expr, Id};
+    use crate::execution_tree::Id;
 
     use super::Value;
 
@@ -72,6 +72,41 @@ pub enum Value {
 }
 
 impl Value {
+    pub fn as_bool(&self) -> Option<bool> {
+        match self {
+            Self::Bool(b) => Some(*b),
+            _ => None,
+        }
+    }
+
+    pub fn as_number(&self) -> Option<f64> {
+        match self {
+            Self::Number(n) => Some(*n),
+            _ => None,
+        }
+    }
+
+    pub fn as_string(&self) -> Option<&str> {
+        match self {
+            Self::String(s) => Some(s),
+            _ => None,
+        }
+    }
+
+    pub fn as_object(&self) -> Option<&HashMap<String, Value>> {
+        match self {
+            Self::Object(h) => Some(h),
+            _ => None,
+        }
+    }
+
+    pub fn as_object_mut(&mut self) -> Option<&mut HashMap<String, Value>> {
+        match self {
+            Self::Object(h) => Some(h),
+            _ => None,
+        }
+    }
+
     pub fn as_function(&self) -> Option<&Function> {
         match self {
             Self::Function(function) => Some(function),