46 lines
1.1 KiB
Rust
46 lines
1.1 KiB
Rust
// 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(Vec<Expr>),
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Symbol(String),
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Str(String),
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Quote(Box<Expr>),
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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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Nil,
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NoMatch,
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}
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#[derive(Debug, Eq, PartialEq, Clone)]
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pub enum Error {
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SyntaxError
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}
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