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//! Submodule implementing the `FromStr` trait for the `Element` enum.
use core::str::FromStr;
impl FromStr for crate::Element {
type Err = crate::errors::Error;
/// Parses an element from its symbol string.
///
/// Parses element symbols into Element variants.
///
/// # Examples
///
/// ```rust
/// use elements_rs::Element;
///
/// let hydrogen: Element = "H".parse().unwrap();
/// assert_eq!(hydrogen, Element::H);
///
/// let oxygen: Element = "O".parse().unwrap();
/// assert_eq!(oxygen, Element::O);
///
/// let carbon: Element = "C".parse().unwrap();
/// assert_eq!(carbon, Element::C);
/// ```
#[inline]
#[allow(clippy::too_many_lines)]
fn from_str(value: &str) -> Result<Self, Self::Err> {
Ok(match value {
"H" => Self::H,
"He" => Self::He,
"Li" => Self::Li,
"Be" => Self::Be,
"B" => Self::B,
"C" => Self::C,
"N" => Self::N,
"O" => Self::O,
"F" => Self::F,
"Ne" => Self::Ne,
"Na" => Self::Na,
"Mg" => Self::Mg,
"Al" => Self::Al,
"Si" => Self::Si,
"P" => Self::P,
"S" => Self::S,
"Cl" => Self::Cl,
"Ar" => Self::Ar,
"K" => Self::K,
"Ca" => Self::Ca,
"Sc" => Self::Sc,
"Ti" => Self::Ti,
"V" => Self::V,
"Cr" => Self::Cr,
"Mn" => Self::Mn,
"Fe" => Self::Fe,
"Co" => Self::Co,
"Ni" => Self::Ni,
"Cu" => Self::Cu,
"Zn" => Self::Zn,
"Ga" => Self::Ga,
"Ge" => Self::Ge,
"As" => Self::As,
"Se" => Self::Se,
"Br" => Self::Br,
"Kr" => Self::Kr,
"Rb" => Self::Rb,
"Sr" => Self::Sr,
"Y" => Self::Y,
"Zr" => Self::Zr,
"Nb" => Self::Nb,
"Mo" => Self::Mo,
"Tc" => Self::Tc,
"Ru" => Self::Ru,
"Rh" => Self::Rh,
"Pd" => Self::Pd,
"Ag" => Self::Ag,
"Cd" => Self::Cd,
"In" => Self::In,
"Sn" => Self::Sn,
"Sb" => Self::Sb,
"Te" => Self::Te,
"I" => Self::I,
"Xe" => Self::Xe,
"Cs" => Self::Cs,
"Ba" => Self::Ba,
"La" => Self::La,
"Ce" => Self::Ce,
"Pr" => Self::Pr,
"Nd" => Self::Nd,
"Pm" => Self::Pm,
"Sm" => Self::Sm,
"Eu" => Self::Eu,
"Gd" => Self::Gd,
"Tb" => Self::Tb,
"Dy" => Self::Dy,
"Ho" => Self::Ho,
"Er" => Self::Er,
"Tm" => Self::Tm,
"Yb" => Self::Yb,
"Lu" => Self::Lu,
"Hf" => Self::Hf,
"Ta" => Self::Ta,
"W" => Self::W,
"Re" => Self::Re,
"Os" => Self::Os,
"Ir" => Self::Ir,
"Pt" => Self::Pt,
"Au" => Self::Au,
"Hg" => Self::Hg,
"Tl" => Self::Tl,
"Pb" => Self::Pb,
"Bi" => Self::Bi,
"Po" => Self::Po,
"At" => Self::At,
"Rn" => Self::Rn,
"Fr" => Self::Fr,
"Ra" => Self::Ra,
"Ac" => Self::Ac,
"Th" => Self::Th,
"Pa" => Self::Pa,
"U" => Self::U,
"Np" => Self::Np,
"Pu" => Self::Pu,
"Am" => Self::Am,
"Cm" => Self::Cm,
"Bk" => Self::Bk,
"Cf" => Self::Cf,
"Es" => Self::Es,
"Fm" => Self::Fm,
"Md" => Self::Md,
"No" => Self::No,
"Lr" => Self::Lr,
"Rf" => Self::Rf,
"Db" => Self::Db,
"Sg" => Self::Sg,
"Bh" => Self::Bh,
"Hs" => Self::Hs,
"Mt" => Self::Mt,
"Ds" => Self::Ds,
"Rg" => Self::Rg,
"Cn" => Self::Cn,
"Nh" => Self::Nh,
"Fl" => Self::Fl,
"Mc" => Self::Mc,
"Lv" => Self::Lv,
"Ts" => Self::Ts,
"Og" => Self::Og,
_ => {
let mut characters: [char; 2] = [' '; 2];
for (i, c) in value.chars().take(2).enumerate() {
characters[i] = c;
}
return Err(crate::errors::Error::Element(characters));
}
})
}
}
#[cfg(test)]
mod tests {
use strum::IntoEnumIterator;
#[test]
fn test_from_str() {
for element in crate::Element::iter() {
let symbol: &str = element.as_ref();
// Test standard case parsing
let parsed: Result<crate::Element, _> = symbol.parse();
assert!(parsed.is_ok(), "Failed to parse standard symbol '{symbol}' for {element:?}");
assert_eq!(
parsed.unwrap(),
element,
"Parsed element doesn't match for symbol '{symbol}'",
);
}
}
#[test]
fn test_invalid_symbols() {
// Test various invalid inputs
let invalid_symbols = alloc::vec![
"", // empty string
"X", // non-existent element
"Zz", // non-existent element
"ABC", // too long
"H2", // valid element with number
"He2", // valid element with number
"123", // numbers only
" ", // space only
" ", // multiple spaces
"c", // lowercase should not work
"n", // lowercase should not work
"o", // lowercase should not work
];
for invalid in invalid_symbols {
let result: Result<crate::Element, _> = invalid.parse();
assert!(result.is_err(), "Should fail to parse invalid symbol '{invalid}'");
}
}
#[test]
fn test_roundtrip_via_string() {
for element in crate::Element::iter() {
let symbol: &str = element.as_ref();
// Parse back to element
let parsed: crate::Element = symbol.parse().unwrap();
// Should be the same element
assert_eq!(parsed, element, "Roundtrip failed for {element:?}");
}
}
}