browser_engine 0.1.0

A modular, GPU-accelerated, security-first web browser engine built from scratch in Rust.
Documentation 
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pub mod box_model;
pub mod engine;
pub mod tree;

pub use box_model::{Dimensions, EdgeSizes, Rect};
pub use engine::layout_tree;
pub use tree::{build_layout_tree, BoxType, LayoutBox};

#[cfg(test)]
mod tests {
    use super::*;
    use std::collections::HashMap;

    #[test]
    fn test_wrap_text_algorithm() {
        let sentence = "The quick brown fox jumps over the lazy dog";
        let lines = engine::wrap_text(sentence, 100.0, 10.0);
        assert!(lines.len() >= 4);
        assert_eq!(lines[0], "The quick");
    }

    #[test]
    fn test_flexbox_row_layout() {
        let mut parent = LayoutBox::new(BoxType::Block(0));
        let child1 = LayoutBox::new(BoxType::Block(1));
        let child2 = LayoutBox::new(BoxType::Block(2));
        parent.children.push(child1);
        parent.children.push(child2);

        let mut styles = HashMap::new();
        let mut parent_style = HashMap::new();
        parent_style.insert("display".to_string(), "flex".to_string());
        parent_style.insert("flex-direction".to_string(), "row".to_string());
        parent_style.insert("width".to_string(), "300px".to_string());
        styles.insert(0, parent_style);

        let mut child1_style = HashMap::new();
        child1_style.insert("width".to_string(), "100px".to_string());
        child1_style.insert("height".to_string(), "50px".to_string());
        styles.insert(1, child1_style);

        let mut child2_style = HashMap::new();
        child2_style.insert("width".to_string(), "100px".to_string());
        child2_style.insert("height".to_string(), "50px".to_string());
        styles.insert(2, child2_style);

        layout_tree(&mut parent, 800.0, &styles);

        let c1_x = parent.children[0].dimensions.content.x;
        let c2_x = parent.children[1].dimensions.content.x;
        assert!(c2_x > c1_x);
        assert_eq!(c2_x - c1_x, 100.0);
    }

    #[test]
    fn test_margin_auto_horizontal_centering() {
        let mut box_node = LayoutBox::new(BoxType::Block(0));
        let mut styles = HashMap::new();
        let mut style = HashMap::new();
        style.insert("width".to_string(), "400px".to_string());
        style.insert("margin".to_string(), "0 auto".to_string());
        styles.insert(0, style);

        layout_tree(&mut box_node, 1000.0, &styles);

        assert_eq!(box_node.dimensions.margin.left, 300.0);
        assert_eq!(box_node.dimensions.margin.right, 300.0);
        assert_eq!(box_node.dimensions.content.x, 300.0);
    }

    #[test]
    fn test_position_absolute_and_fixed() {
        let mut parent = LayoutBox::new(BoxType::Block(0));
        let child_abs = LayoutBox::new(BoxType::Block(1));
        parent.children.push(child_abs);

        let mut styles = HashMap::new();
        let mut parent_style = HashMap::new();
        parent_style.insert("width".to_string(), "500px".to_string());
        parent_style.insert("height".to_string(), "500px".to_string());
        styles.insert(0, parent_style);

        let mut abs_style = HashMap::new();
        abs_style.insert("position".to_string(), "absolute".to_string());
        abs_style.insert("left".to_string(), "50px".to_string());
        abs_style.insert("top".to_string(), "30px".to_string());
        abs_style.insert("width".to_string(), "100px".to_string());
        styles.insert(1, abs_style);

        layout_tree(&mut parent, 800.0, &styles);

        let abs_box = &parent.children[0];
        assert_eq!(abs_box.dimensions.content.x, 50.0);
        assert_eq!(abs_box.dimensions.content.y, 30.0);
    }
}