25 lines
876 B
Rust
25 lines
876 B
Rust
use std::ops::RangeInclusive;
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use orchid_base::error::OrcRes;
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use orchid_base::number::{num_to_errv, parse_num};
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use orchid_extension::conv::ToExpr;
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use orchid_extension::lexer::{LexContext, Lexer};
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use orchid_extension::tree::{GenTokTree, x_tok};
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use super::num_atom::Num;
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#[derive(Debug, Default)]
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pub struct NumLexer;
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impl Lexer for NumLexer {
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const CHAR_FILTER: &'static [RangeInclusive<char>] = &['0'..='9'];
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async fn lex<'a>(all: &'a str, lxcx: &'a LexContext<'a>) -> OrcRes<(&'a str, GenTokTree)> {
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let ends_at = all.find(|c: char| !c.is_ascii_hexdigit() && !"xX._pP".contains(c));
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let (chars, tail) = all.split_at(ends_at.unwrap_or(all.len()));
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match parse_num(chars) {
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Ok(numeric) =>
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Ok((tail, x_tok(Num(numeric).to_gen().await).await.at(lxcx.pos_lt(chars.len(), tail)))),
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Err(e) => Err(num_to_errv(e, lxcx.pos(all), lxcx.src()).await),
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}
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}
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}
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