67 lines
1.5 KiB
Rust
67 lines
1.5 KiB
Rust
use crate::collections::list;
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use crate::expr::Expression;
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// Note: I kept the number implementation simple for now
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// but we need to decide on our approach to numbers, are
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// we going to only support the 64bit variants? or should
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// try to be smart and support 32 and 64 and switch between
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// them ?
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// What about usize and isize ?
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#[derive(Debug, Clone)]
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pub enum Number {
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Integer(i64),
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Float(f64),
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}
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impl PartialEq for Number {
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fn eq(&self, other: &Self) -> bool {
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let comb = (&self, &other);
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match comb {
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(Number::Integer(x), Number::Integer(y)) => *x == *y,
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(Number::Float(x), Number::Float(y)) => *x == *y,
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(Number::Integer(x), Number::Float(y)) => *x as f64 == *y,
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(Number::Float(x), Number::Integer(y)) => *x == *y as f64,
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}
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}
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}
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impl Eq for Number {}
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#[derive(Debug, Eq, PartialEq, Clone)]
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pub enum Expr {
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//List(list::List<Expr>),
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Symbol(String),
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Str(String),
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Num(Number),
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Comment,
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Error(String),
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// Cons(Box<Expr>, Box<Expr>),
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Cons(list::List<Expr>),
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Nil,
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NoMatch,
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}
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impl Expr {
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pub fn make_list(first: Expr, rest: Expr) -> Expr {
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Expr::Cons(list::List::<Expr>::new(Box::new(first), Box::new(rest)))
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}
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pub fn make_symbol(v: String) -> Expr {
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Expr::Symbol(v)
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}
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pub fn make_string(v: String) -> Expr {
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Expr::Str(v)
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}
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pub fn make_number(n: Number) -> Expr {
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Expr::Num(n)
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}
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}
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impl Expression for Expr {
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fn eval() {}
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fn code_gen() {}
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}
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