chem-parse 0.3.0

A parser for simple chemical forumulas.
Documentation 
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use core::fmt::Debug;

/// A parenthesis type.
/// '(' is `OPEN` and ')' is `CLOSE`
#[derive(Debug, PartialEq)]
pub enum ParenType {
    OPEN,
    CLOSE,
}

/// A token which may have attached data
#[derive(Debug)]
pub enum Tokens {
    /// Elements e.g. Fe. The data is "Fe"
    Element { data: String, meta: TokenMetadata },
    /// Numbers e.g. 13. The data is 13u16
    Number { data: u16, meta: TokenMetadata },
    /// Parenthesis e.g. ) The data is ParenType::CLOSE
    Paren {
        data: ParenType,
        meta: TokenMetadata,
    },
    /// Plus sign +
    Plus { meta: TokenMetadata },
    /// Yields sign ->
    Yields { meta: TokenMetadata },
}

impl Tokens {
    pub fn meta(&self) -> &TokenMetadata {
        match self {
            Self::Element { meta, data: _ } => meta,
            Self::Number { meta, data: _ } => meta,
            Self::Paren { meta, data: _ } => meta,
            Self::Plus { meta } => meta,
            Self::Yields { meta } => meta,
        }
    }
}

impl PartialEq for Tokens {
    fn eq(&self, other: &Self) -> bool {
        match (self, other) {
            (
                Self::Element {
                    data: l_data,
                    meta: _,
                },
                Self::Element {
                    data: r_data,
                    meta: _,
                },
            ) => l_data == r_data,
            (
                Self::Number {
                    data: l_data,
                    meta: _,
                },
                Self::Number {
                    data: r_data,
                    meta: _,
                },
            ) => l_data == r_data,
            (
                Self::Paren {
                    data: l_data,
                    meta: _,
                },
                Self::Paren {
                    data: r_data,
                    meta: _,
                },
            ) => l_data == r_data,
            (Self::Plus { meta: _ }, Self::Plus { meta: _ }) => true,
            (Self::Yields { meta: _ }, Self::Yields { meta: _ }) => true,
            _ => false,
        }
    }
}

#[derive(Debug)]
pub struct TokenMetadata {
    raw: String,
    location: usize,
}

impl TokenMetadata {
    pub fn new(raw: &str, location: usize) -> Self {
        Self {
            raw: raw.into(),
            location,
        }
    }
    pub fn raw(&self) -> &String {
        &self.raw
    }
    pub fn loc(&self) -> usize {
        self.location
    }
}