41 lines
1.1 KiB
Rust
41 lines
1.1 KiB
Rust
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use chumsky::Parser;
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use std::fmt::Debug;
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use super::super::assertion_error::AssertionError;
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use crate::external::litconv::with_lit;
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use crate::parse::float_parser;
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use crate::representations::{interpreted::ExprInst, Literal};
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use crate::{atomic_impl, atomic_redirect, externfn_impl};
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/// ParseFloat a number
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///
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/// Next state: [ParseFloat0]
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#[derive(Clone)]
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pub struct ParseFloat1;
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externfn_impl!(ParseFloat1, |_: &Self, x: ExprInst| {Ok(ParseFloat0{x})});
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/// Applied to_string function
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///
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/// Prev state: [ParseFloat1]
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#[derive(Debug, Clone)]
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pub struct ParseFloat0{ x: ExprInst }
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atomic_redirect!(ParseFloat0, x);
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atomic_impl!(ParseFloat0, |Self{ x }: &Self| {
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let number = with_lit(x, |l| Ok(match l {
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Literal::Str(s) => {
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let parser = float_parser();
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parser.parse(s.as_str())
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.map_err(|_| AssertionError::ext(x.clone(), "cannot be parsed into a float"))?
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}
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Literal::Num(n) => *n,
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Literal::Uint(i) => (*i as u32).into(),
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Literal::Char(char) => char.to_digit(10)
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.ok_or(AssertionError::ext(x.clone(), "is not a decimal digit"))?
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.into()
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}))?;
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Ok(number.into())
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}); |