umya-spreadsheet 2.3.3

umya-spreadsheet is a library written in pure Rust to read and write xlsx file.
Documentation 
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// fronts
use crate::reader::driver::*;
use crate::structs::Font;
use crate::structs::Style;
use crate::writer::driver::*;
use quick_xml::events::{BytesStart, Event};
use quick_xml::Reader;
use quick_xml::Writer;
use std::io::Cursor;
use thin_vec::ThinVec;

#[derive(Clone, Default, Debug)]
pub(crate) struct Fonts {
    font: ThinVec<Font>,
}

impl Fonts {
    #[inline]
    pub(crate) fn get_font(&self) -> &[Font] {
        &self.font
    }

    #[inline]
    pub(crate) fn get_font_mut(&mut self) -> &mut ThinVec<Font> {
        &mut self.font
    }

    #[inline]
    pub(crate) fn set_font(&mut self, value: Font) -> &mut Self {
        self.font.push(value);
        self
    }

    pub(crate) fn set_style(&mut self, style: &Style) -> u32 {
        match style.get_font() {
            Some(v) => {
                let hash_code = v.get_hash_code();
                let mut id = 0;
                for font in &self.font {
                    if font.get_hash_code() == hash_code {
                        return id;
                    }
                    id += 1;
                }
                self.set_font(v.clone());
                id
            }
            None => 0,
        }
    }

    pub(crate) fn set_attributes<R: std::io::BufRead>(
        &mut self,
        reader: &mut Reader<R>,
        _e: &BytesStart,
    ) {
        xml_read_loop!(
            reader,
            Event::Empty(ref e) => {
                if e.name().into_inner() == b"font" {
                    let obj = Font::default();
                    self.set_font(obj);
                }
            },
            Event::Start(ref e) => {
                if e.name().into_inner() == b"font" {
                    let mut obj = Font::default();
                    obj.set_attributes(reader, e);
                    self.set_font(obj);
                }
            },
            Event::End(ref e) => {
                if e.name().into_inner() == b"fonts" {
                    return
                }
            },
            Event::Eof => panic!("Error: Could not find {} end element", "fonts")
        );
    }

    pub(crate) fn write_to(&self, writer: &mut Writer<Cursor<Vec<u8>>>) {
        if !self.font.is_empty() {
            // fonts
            write_start_tag(
                writer,
                "fonts",
                vec![
                    ("count", &self.font.len().to_string()),
                    ("x14ac:knownFonts", "1"),
                ],
                false,
            );

            // font
            for font in &self.font {
                font.write_to_font(writer);
            }

            write_end_tag(writer, "fonts");
        }
    }
}