0264408
56 lines
1.5 KiB
Rust
56 lines
1.5 KiB
Rust
pub mod env;
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pub mod interpreter;
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pub use env::Env;
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pub use interpreter::Interpreter;
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use std::rc::Rc;
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use std::cell::RefCell;
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use std::fmt;
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pub type NativeFn = fn(Vec<Value>) -> Value;
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#[derive(Clone)]
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pub enum Value {
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Number(f64),
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String(String),
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Bool(bool),
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Nil,
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Function(Rc<Function>),
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NativeFunction(NativeFn),
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}
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impl std::fmt::Debug for Value {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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match self {
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Value::Number(n) => write!(f, "Number({:?})", n),
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Value::String(s) => write!(f, "String({:?})", s),
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Value::Bool(b) => write!(f, "Bool({:?})", b),
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Value::Nil => write!(f, "Nil"),
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Value::Function(_) => write!(f, "Function(...)"),
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Value::NativeFunction(_) => write!(f, "NativeFunction(...)"),
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}
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}
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}
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impl fmt::Display for Value {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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Value::Number(n) => write!(f, "{}", n),
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Value::String(s) => write!(f, "{}", s),
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Value::Bool(b) => write!(f, "{}", b),
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Value::Nil => write!(f, "nil"),
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Value::Function(_) => write!(f, "<function>"),
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Value::NativeFunction(_) => write!(f, "<native function>"),
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}
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}
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}
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#[derive(Debug, Clone)]
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pub struct Function {
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pub params: Vec<String>,
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pub body: Vec<crate::ast::Stmt>,
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pub env: Rc<RefCell<Env>>, // 闭包捕获环境
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pub name: Option<String>,
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}
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