document-svg 0.1.1

pub(crate) mod chart;
pub(crate) mod docx;
mod package;
pub(crate) mod pptx;
pub(crate) mod xlsx;
mod xml;

pub(crate) use package::{Relationships, ZipPackage};
pub(crate) use xml::{
    attribute, color_from_hex, local_name, parse_f64, parse_i64, qualified_attribute,
};

pub(crate) fn text_advance_factor(character: char) -> f64 {
    let code = u32::from(character);
    if character == '\t' {
        return 1.5;
    }
    if character.is_control() || character == '\u{00ad}' {
        return 0.0;
    }
    if matches!(
        code,
        0x0300..=0x036f
            | 0x1ab0..=0x1aff
            | 0x1dc0..=0x1dff
            | 0x20d0..=0x20ff
            | 0xfe20..=0xfe2f
    ) {
        return 0.0;
    }
    if character.is_whitespace() {
        return 0.28;
    }
    if character.is_ascii() {
        return match character {
            'i' | 'l' | 'I' | '!' | '|' | '.' | ',' | ':' | ';' | '\'' | '`' => 0.28,
            'f' | 'j' | 'r' | 't' | '(' | ')' | '[' | ']' | '{' | '}' => 0.38,
            'm' | 'w' | 'M' | 'W' | '@' | '%' | '&' => 0.82,
            'A'..='Z' => 0.64,
            '0'..='9' => 0.56,
            'a'..='z' => 0.52,
            _ => 0.5,
        };
    }
    if matches!(code, 0xff61..=0xff9f) {
        return 0.5;
    }
    if matches!(
        code,
        0x1100..=0x11ff
            | 0x2e80..=0x9fff
            | 0xac00..=0xd7af
            | 0xf900..=0xfaff
            | 0xfe10..=0xfe6f
            | 0xff01..=0xff60
            | 0xffe0..=0xffe6
            | 0x1f000..=0x1faff
    ) {
        return 1.0;
    }
    0.58
}

#[cfg(test)]
mod tests {
    use super::text_advance_factor;

    #[test]
    fn estimates_deterministic_script_aware_character_widths() {
        assert!(text_advance_factor('i') < text_advance_factor('W'));
        assert_eq!(text_advance_factor('漢'), 1.0);
        assert_eq!(text_advance_factor('ｶ'), 0.5);
        assert_eq!(text_advance_factor('\u{0301}'), 0.0);
    }
}