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use std::cmp::Ordering; use std::borrow::Cow; use errors; use object::Object; use object_pool::ObjectPool; use object_info::ObjectHandle; use opcode::{OpCode, RtOpCode}; #[derive(Copy, Clone, Debug, PartialEq)] pub enum Value { Object(usize), Null, Bool(bool), Int(i64), Float(f64) } impl Value { pub fn is_object(&self) -> bool { if let Value::Object(_) = *self { true } else { false } } pub fn as_object_id(&self) -> usize { if let Value::Object(obj) = *self { obj } else { panic!(errors::VMError::from(errors::RuntimeError::new( format!("Not an object: {:?}", self) ))); } } pub fn to_opcode(&self) -> OpCode { match *self { Value::Object(id) => OpCode::Rt(RtOpCode::LoadObject(id)), Value::Null => OpCode::LoadNull, Value::Bool(v) => OpCode::LoadBool(v), Value::Int(v) => OpCode::LoadInt(v), Value::Float(v) => OpCode::LoadFloat(v) } } } pub struct ValueContext<'a, 'b> { pub value: &'a Value, pub pool: &'b ObjectPool } impl<'a, 'b> ValueContext<'a, 'b> { pub fn new(v: &'a Value, pool: &'b ObjectPool) -> ValueContext<'a, 'b> { ValueContext { value: v, pool: pool } } pub fn is_object(&self) -> bool { self.value.is_object() } pub fn as_object_id(&self) -> usize { self.value.as_object_id() } pub fn as_object<'z>(&self) -> ObjectHandle<'z> { self.pool.get(self.as_object_id()) } pub fn as_object_direct(&self) -> &'b Object { self.pool.get_direct(self.as_object_id()) } pub fn to_i64(&self) -> i64 { match *self.value { Value::Object(id) => self.pool.get_direct(id).to_i64(), Value::Null => 0, Value::Bool(v) => if v { 1 } else { 0 }, Value::Int(v) => v, Value::Float(v) => v as i64 } } pub fn to_f64(&self) -> f64 { match *self.value { Value::Object(id) => self.pool.get_direct(id).to_f64(), Value::Null => 0.0, Value::Bool(v) => if v { 1.0 } else { 0.0 }, Value::Int(v) => v as f64, Value::Float(v) => v } } pub fn to_bool(&self) -> bool { match *self.value { Value::Object(id) => self.pool.get_direct(id).to_bool(), Value::Null => false, Value::Bool(v) => v, Value::Int(v) => if v != 0 { true } else { false }, Value::Float(v) => if v != 0.0 { true } else { false } } } pub fn compare(&self, other: &ValueContext) -> Option<Ordering> { if let Value::Object(_) = *self.value { return self.as_object_direct().compare(other); } if let Value::Object(_) = *other.value { return other.as_object_direct().compare(self); } match (*self.value, *other.value) { (Value::Null, Value::Null) => Some(Ordering::Equal), (Value::Bool(a), Value::Bool(b)) => a.partial_cmp(&b), (Value::Int(a), Value::Int(b)) => a.partial_cmp(&b), (Value::Float(a), Value::Float(b)) => a.partial_cmp(&b), (Value::Int(a), Value::Float(b)) => (a as f64).partial_cmp(&b), (Value::Float(a), Value::Int(b)) => a.partial_cmp(&(b as f64)), _ => None } } pub fn to_str<'z>(&'z self) -> Cow<'z, str> { match *self.value { Value::Object(_) => Cow::from(self.as_object_direct().to_str()), Value::Null => Cow::from("(null)"), Value::Bool(v) => Cow::from(if v { "true" } else { "false" }), Value::Int(v) => Cow::from(format!("{}", v)), Value::Float(v) => Cow::from(format!("{}", v)) } } }