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#![allow(non_snake_case)]
#![allow(unused_variables)]
#![doc = include_str!("readme.md")]
mod matrix;
pub use self::matrix::*;
use crate::{
    blocks::MathStyle, LineThickness, MathElement, MathFenced, MathFraction, MathML, MathMultiScript, MathRow, MathTable,
};

/// Build a normal fraction.
///
/// # Input
///
/// ```tex
/// \begin{vmatrix} a & b \\ c & d \end{vmatrix}
/// ```
///
/// # Output
#[doc = include_str!("isotope.xml")]
pub fn frac<N, D>(numerator: N, denominator: D) -> MathML
where
    N: Into<MathML>,
    D: Into<MathML>,
{
    MathML::fraction(numerator, denominator)
}

/// Renders a display style fraction.
///
/// # Input
///
/// ```tex
/// \begin{vmatrix} a & b \\ c & d \end{vmatrix}
/// ```
///
/// # Output
#[doc = include_str!("isotope.xml")]
pub fn dfrac<N, D>(numerator: N, denominator: D) -> MathML
where
    N: Into<MathML>,
    D: Into<MathML>,
{
    MathStyle::display(frac(numerator, denominator)).into()
}

/// Renders a matrix with vertical bars.
///
/// # Input
///
/// ```tex
/// \begin{vmatrix} a & b \\ c & d \end{vmatrix}
/// ```
///
/// # Output
#[doc = include_str!("isotope.xml")]
pub fn cfrac(numerator: MathML, denominator: MathML) -> MathML {
    todo!()
}

/// Renders binomial coefficient as `\binom{n}{k}`.
///
/// # Input
///
/// ```
/// # use mathml_core::helpers::binom;
/// binom('n', 'k');
/// ```
///
/// # Output
#[doc = include_str!("isotope.xml")]
pub fn binom<N, D>(numerator: N, denominator: D) -> MathML
where
    N: Into<MathML>,
    D: Into<MathML>,
{
    MathFraction::new(numerator.into(), denominator.into()).with_thickness(LineThickness::Length(0)).into()
}

/// Renders binomial coefficient as `C_{n}^{k}`.
///
/// # Input
///
/// ```
/// # use mathml_core::helpers::cbinom;
/// cbinom('n', 'k');
/// ```
///
/// # Output
#[doc = include_str!("isotope.xml")]
pub fn cbinom<N, D>(numerator: N, denominator: D) -> MathML
where
    N: Into<MathML>,
    D: Into<MathML>,
{
    MathMultiScript::sub_super_script(MathML::identifier("C"), numerator.into(), denominator.into()).into()
}

/// Renders a matrix with vertical bars.
///
/// # Input
///
/// ```no_run
/// # use mathml_core::helpers::legendre_symbols;
/// legendre_symbols('a', 'b');
/// ```
///
/// # Output
#[doc = include_str!("isotope.xml")]
pub fn legendre_symbols<N, D>(numerator: N, denominator: D) -> MathFenced
where
    N: Into<MathML>,
    D: Into<MathML>,
{
    MathFenced::new(vec![MathFraction::new(numerator.into(), denominator.into()).into()], '(', ')')
}

/// Build a isotopic symbol.
///
/// # Input
///
/// ```
/// # use mathml_core::{helpers::isotope, MathFenced};
/// MathFenced::parentheses(vec![
///     isotope("H", 1, None).into(),
///     isotope("H", 2, Some(2)).into(),
///     isotope("H", 3, None).into(),
/// ]);
/// ```
///
/// # Output
#[doc = include_str!("isotope.xml")]
pub fn isotope(symbol: &str, mass_number: usize, atomic_number: Option<usize>) -> MathMultiScript {
    let ld = match atomic_number {
        Some(s) => vec![s.into()],
        None => vec![],
    };
    MathMultiScript::new(MathML::identifier(symbol), vec![MathML::number(mass_number)], ld, vec![], vec![])
}

/// Build a isotopic symbol.
#[inline(always)]
pub fn safe_html_char<W>(writer: &mut W, c: char) -> std::fmt::Result
where
    W: std::fmt::Write,
{
    match c {
        '<' => writer.write_str("&lt;"),
        '>' => writer.write_str("&gt;"),
        '&' => writer.write_str("&amp;"),
        '"' => writer.write_str("&quot;"),
        '\'' => writer.write_str("&apos;"),
        _ => writer.write_char(c),
    }
}

/// Build a isotopic symbol.
#[inline(always)]
pub fn safe_html_str<W>(writer: &mut W, s: &str) -> std::fmt::Result
where
    W: std::fmt::Write,
{
    for c in s.chars() {
        safe_html_char(writer, c)?;
    }
    Ok(())
}

/// Assert that the MathML is equal to the target string, ignoring all whitespaces.
#[track_caller]
pub fn assert_no_ws(source: &MathML, target: &str) {
    let text = source.to_string();
    assert_eq!(remove_ws(&text), remove_ws(target));
}

/// remove all whitespaces from a string
#[inline]
fn remove_ws(string: &str) -> String {
    let mut refined = String::with_capacity(string.len());
    for char in string.chars() {
        if char.is_whitespace() {
            continue;
        }
        refined.push(char);
    }
    refined
}