Chemical calculator: Difference between revisions
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rust example
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Line 3,884:
C27H46O -> 386.664
Uue -> 315.000</pre>
=={{header|Rust}}==
<syntaxhighlight lang="rust">use regex::Regex;
use eval::{eval, to_value};
use aho_corasick::AhoCorasick;
const ELEMENTS: &[&str; 5] = &["H", "C", "O", "Na", "S",];
const WEIGHTS: &[&str; 5] = &["1.008", "12.011", "15.999", "22.98976928", "32.06",];
fn main() {
let test_strings = ["H", "H2", "H2O", "Na2SO4", "C6H12", "COOH(C(CH3)2)3CH3"];
let test_values = [1.008, 2.016, 18.015, 142.03553856000002, 84.162, 186.29500000000002];
let ac = AhoCorasick::new(ELEMENTS).unwrap();
let regex1 = Regex::new(r"(?<num>\d+)").unwrap();
let regex2 = Regex::new(r"(?<group>[A-Z][a-z]{0,2}|\()").unwrap();
for (i, s) in test_strings.iter().enumerate() {
let s1 = regex1.replace_all(*s, "*$num");
let s2 = regex2.replace_all(&s1, "+$group");
let s3 = ac.replace_all(&s2, WEIGHTS).trim_start_matches("+").replace("(+", "(");
let mass: Result<eval::Value, eval::Error> = eval(&s3);
assert_eq!(mass, Ok(to_value(test_values[i])));
println!("The molar mass of {} checks correctly as {}.", s, test_values[i]);
}
}
</syntaxhighlight>{{out}}
<pre>
The molar mass of H checks correctly as 1.008.
The molar mass of H2 checks correctly as 2.016.
The molar mass of H2O checks correctly as 18.015.
The molar mass of Na2SO4 checks correctly as 142.03553856000002.
The molar mass of C6H12 checks correctly as 84.162.
The molar mass of COOH(C(CH3)2)3CH3 checks correctly as 186.29500000000002.
</pre>
=={{header|Swift}}==
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