cljrs-eval 0.1.7

Tree-walking interpreter and macro expander for clojurust
Documentation 
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use crate::util::numeric_as_i64;
use cljrs_gc::{GcPtr, MarkVisitor, Trace};
use cljrs_value::{NativeObject, NativeObjectBox, ObjectArray, Value, ValueError, ValueResult};
use std::any::Any;
use std::sync::Mutex;

#[derive(Debug)]
struct ArrayList {
    elements: Mutex<Vec<Value>>,
}

const NAME: &str = "ArrayList";

impl Trace for ArrayList {
    fn trace(&self, visitor: &mut MarkVisitor) {
        let elements = self.elements.lock().unwrap();
        for element in elements.iter() {
            element.trace(visitor);
        }
    }
}

impl NativeObject for ArrayList {
    fn type_tag(&self) -> &str {
        NAME
    }

    fn as_any(&self) -> &dyn Any {
        self
    }
}

pub fn builtin_array_list(args: &[Value]) -> ValueResult<Value> {
    let elements: Vec<Value> = if args.is_empty() {
        Vec::new()
    } else {
        match &args[0] {
            Value::Long(n) => Vec::with_capacity(*n as usize),
            // TODO, collection types, init array-list.
            v => {
                return Err(ValueError::WrongType {
                    expected: "long or collection",
                    got: v.type_name().to_string(),
                });
            }
        }
    };
    Ok(Value::NativeObject(GcPtr::new(NativeObjectBox::new(
        ArrayList {
            elements: Mutex::new(elements),
        },
    ))))
}

pub fn builtin_array_list_push(args: &[Value]) -> ValueResult<Value> {
    match &args[0] {
        Value::NativeObject(obj) if obj.get().type_tag() == NAME => {
            if let Some(array_list) = obj.get().downcast_ref::<ArrayList>() {
                let mut elements = array_list.elements.lock().unwrap();
                elements.push(args[1].clone());
                Ok(args[0].clone())
            } else {
                Err(ValueError::WrongType {
                    expected: "array-list",
                    got: obj.get().type_tag().to_string(),
                })
            }
        }
        v => Err(ValueError::WrongType {
            expected: "array-list",
            got: v.type_name().to_string(),
        }),
    }
}

pub fn builtin_array_list_length(args: &[Value]) -> ValueResult<Value> {
    match &args[0] {
        Value::NativeObject(obj) if obj.get().type_tag() == NAME => {
            if let Some(array_list) = obj.get().downcast_ref::<ArrayList>() {
                let elements = array_list.elements.lock().unwrap();
                Ok(Value::Long(elements.len() as i64))
            } else {
                Err(ValueError::WrongType {
                    expected: "array-list",
                    got: obj.get().type_tag().to_string(),
                })
            }
        }
        v => Err(ValueError::WrongType {
            expected: "array-list",
            got: v.type_name().to_string(),
        }),
    }
}

pub fn builtin_array_list_remove(args: &[Value]) -> ValueResult<Value> {
    match &args[0] {
        Value::NativeObject(obj) if obj.get().type_tag() == NAME => {
            let index = numeric_as_i64(&args[1])? as usize;
            if let Some(array_list) = obj.get().downcast_ref::<ArrayList>() {
                let mut elements = array_list.elements.lock().unwrap();
                if index >= elements.len() {
                    return Err(ValueError::IndexOutOfBounds {
                        idx: index,
                        count: elements.len(),
                    });
                }
                let removed = elements.remove(index);
                Ok(removed.clone())
            } else {
                Err(ValueError::WrongType {
                    expected: "array-list",
                    got: obj.get().type_tag().to_string(),
                })
            }
        }
        v => Err(ValueError::WrongType {
            expected: "array-list",
            got: v.type_name().to_string(),
        }),
    }
}

pub fn builtin_array_list_to_array(args: &[Value]) -> ValueResult<Value> {
    match &args[0] {
        Value::NativeObject(obj) if obj.get().type_tag() == NAME => {
            let elements = obj
                .get()
                .downcast_ref::<ArrayList>()
                .unwrap()
                .elements
                .lock()
                .unwrap();
            Ok(Value::ObjectArray(GcPtr::new(ObjectArray(Mutex::new(
                elements.iter().cloned().collect(),
            )))))
        }
        v => Err(ValueError::WrongType {
            expected: "array-list",
            got: v.type_name().to_string(),
        }),
    }
}

pub fn builtin_array_list_clear(args: &[Value]) -> ValueResult<Value> {
    match &args[0] {
        Value::NativeObject(obj) if obj.get().type_tag() == NAME => {
            let mut elements = obj
                .get()
                .downcast_ref::<ArrayList>()
                .unwrap()
                .elements
                .lock()
                .unwrap();
            elements.clear();
            Ok(args[0].clone())
        }
        v => Err(ValueError::WrongType {
            expected: "array-list",
            got: v.type_name().to_string(),
        }),
    }
}