fonts 0.2.0

High-performance font parsing and analysis library for Grida Canvas
Documentation 
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use std::fs;
use std::path::PathBuf;

use fonts::Parser;

fn font_path(rel: &str) -> PathBuf {
    PathBuf::from(env!("CARGO_MANIFEST_DIR"))
        .join("../../fixtures/fonts")
        .join(rel)
}

#[test]
fn extracts_feature_tags_and_ui_names() {
    let path = font_path("Recursive/Recursive-VariableFont_CASL,CRSV,MONO,slnt,wght.ttf");
    let data = fs::read(path).unwrap();
    let parser = Parser::new(&data).unwrap();
    let features = parser.ffeatures();
    let ss01 = features.iter().find(|f| f.tag == "ss01").unwrap();
    assert_eq!(ss01.name, "Single-story ‘a’");
    assert!(!ss01.lookup_indices.is_empty());
}

#[test]
fn extracts_glyphs_for_ligature_feature() {
    let path = font_path("Recursive/Recursive-VariableFont_CASL,CRSV,MONO,slnt,wght.ttf");
    let data = fs::read(path).unwrap();
    let parser = Parser::new(&data).unwrap();
    let features = parser.ffeatures();
    let liga = features.iter().find(|f| f.tag == "liga").unwrap();
    assert!(!liga.glyphs.is_empty());
    assert!(liga.glyphs.contains(&"fi".to_string()));
}

#[test]
fn returns_original_characters_for_single_substitution_features() {
    let path = font_path("Recursive/Recursive-VariableFont_CASL,CRSV,MONO,slnt,wght.ttf");
    let data = fs::read(path).unwrap();
    let parser = Parser::new(&data).unwrap();
    let features = parser.ffeatures();
    let ss01 = features.iter().find(|f| f.tag == "ss01").unwrap();
    assert!(ss01.glyphs.contains(&"a".to_string()));
}

#[test]
fn extracts_kern_feature_from_inter_font() {
    let path = font_path("Inter/Inter-VariableFont_opsz,wght.ttf");
    let data = fs::read(path).unwrap();
    let parser = Parser::new(&data).unwrap();
    let features = parser.ffeatures();

    // Check if kern feature exists
    let kern = features.iter().find(|f| f.tag == "kern");
    assert!(kern.is_some(), "kern feature should exist in Inter font");

    let kern_feature = kern.unwrap();
    assert!(!kern_feature.lookup_indices.is_empty());
    assert!(!kern_feature.glyphs.is_empty());
}