59 lines
2.5 KiB
Rust
59 lines
2.5 KiB
Rust
/*
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* asklyphe-frontend unit_converter.rs
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* - wrapper for the unit converter library
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*
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* Copyright (C) 2025 Real Microsoft, LLC
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*
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* This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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use std::str::FromStr;
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use unit_converter::length_units::{LengthUnit, LENGTH_NAMES};
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use unit_converter::unit_defs::{BestUnit, ConvertTo, FromUnitName, UnitName};
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use unit_converter::{parse_number, remove_leading_conversion_word};
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#[derive(Clone, Debug)]
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pub struct UnitConversion {
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pub value: String,
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pub unit_a: String,
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pub equals: String,
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pub unit_b: String,
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}
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pub fn convert_unit(query_text: &str) -> Option<UnitConversion> {
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let (number, remainder) = parse_number(query_text);
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if number.is_nan() {
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return None;
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}
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let og_number = number.clone();
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let unit = LengthUnit::parse(remainder);
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unit.as_ref()?;
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let (unit_a, remainder) = unit.unwrap();
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let remainder = remove_leading_conversion_word(&remainder);
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if let Some((unit_b, _)) = LengthUnit::parse(remainder) {
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let conversion = unit_a.convert_to(number, unit_b);
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let approx = f64::from_str(&format!("{}", conversion)).unwrap();
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let approx_og = f64::from_str(&format!("{}", og_number)).unwrap();
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Some(UnitConversion {
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value: format!("{}", approx_og),
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unit_a: unit_a.unit_name(og_number),
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equals: format!("{}", approx),
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unit_b: unit_b.unit_name(conversion),
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})
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} else {
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let best_unit = LengthUnit::best_unit(unit_a, number.clone());
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let conversion = unit_a.convert_to(number, best_unit);
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let approx = f64::from_str(&format!("{}", conversion)).unwrap();
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let approx_og = f64::from_str(&format!("{}", og_number)).unwrap();
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Some(UnitConversion {
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value: format!("{}", approx_og),
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unit_a: unit_a.unit_name(og_number),
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equals: format!("{}", approx),
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unit_b: best_unit.unit_name(conversion),
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})
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}
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}
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