28 lines
626 B
Rust
28 lines
626 B
Rust
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use std::collections::hash_map::DefaultHasher;
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use std::hash::{Hash, Hasher};
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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pub enum Prim {
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Sin,
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Cos,
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Triple, // 3 * x
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AddPair, // (a,b) -> a + b
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Input, // переменная x
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}
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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pub enum ExprAst {
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Atom(Prim),
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Composition(Box<ExprAst>, Box<ExprAst>), // g ∘ f
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Junction(Box<ExprAst>, Box<ExprAst>), // (f, g)
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}
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pub fn ast_input() -> ExprAst {
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ExprAst::Atom(Prim::Input)
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}
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pub fn hash_ast(e: &ExprAst) -> u64 {
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let mut h = DefaultHasher::new();
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e.hash(&mut h);
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h.finish()
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}
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