node.rs

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#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Class {
    Variable,
    Ordinary,
    Binary,
    Relation,
    Open,
    Close,
    Punctuation,
    Function,
    Large,
    Space(f64),
}


#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Style {
    Auto,
    Roman,
    Italic,
    Bold,
    BoldItalic,
    Blackboard,
    Script,
    Fraktur,
    SansSerif,
    Monospace,
}


#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Limits {
    Auto,
    Always,
    Never,
}


#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Level {
    Display,
    Text,
    Script,
    ScriptScript,
}


#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Align {
    Left,
    Center,
    Right,
}


#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Spacing {
    Matrix,
    Align,
    Alignat,
}


#[derive(Debug, Clone, PartialEq)]
pub enum Node {
    Symbol {
        text: String,
        class: Class,
    },
    Text(String),
    Row(Vec<Node>),
    Fraction {
        numerator: Box<Node>,
        denominator: Box<Node>,
        bar: bool,
    },
    Root {
        index: Option<Box<Node>>,
        body: Box<Node>,
    },
    Scripts {
        base: Box<Node>,
        superscript: Option<Box<Node>>,
        subscript: Option<Box<Node>>,
        limits: Limits,
    },
    Fenced {
        left: &'static str,
        right: &'static str,
        body: Box<Node>,
    },
    Matrix {
        rows: Vec<Vec<Node>>,
        left: &'static str,
        right: &'static str,
        align: Vec<Align>,
        lines: Vec<usize>,
        spacing: Spacing,
    },
    Styled {
        style: Style,
        body: Box<Node>,
    },
    Operator {
        body: Box<Node>,
    },
    Accent {
        mark: &'static str,
        body: Box<Node>,
        above: bool,
    },
    Sized {
        level: Level,
        body: Box<Node>,
    },
    Delimiter {
        text: &'static str,
        height: f64,
        class: Class,
    },
    Extend {
        mark: &'static str,
        above: Option<Box<Node>>,
        below: Option<Box<Node>>,
    },
    Line {
        body: Box<Node>,
        above: bool,
    },
    Phantom {
        body: Box<Node>,
        width: bool,
        height: bool,
    },
}


pub fn empty() -> Node {
    Node::Row(Vec::new())
}


pub fn is_empty(node: &Node) -> bool {
    matches!(node, Node::Row(items) if items.is_empty())
}


pub fn class_of(node: &Node) -> Class {
    match node {
        Node::Symbol {class, ..} => *class,
        Node::Scripts {base, ..} => class_of(base),
        Node::Styled {body, ..} => class_of(body),
        Node::Operator {..} => Class::Function,
        Node::Sized {body, ..} => class_of(body),
        Node::Delimiter {class, ..} => *class,
        Node::Extend {..} => Class::Relation,
        _ => Class::Ordinary,
    }
}


pub fn class_name(class: Class) -> &'static str {
    match class {
        Class::Variable => "variable",
        Class::Ordinary => "ordinary",
        Class::Binary => "binary",
        Class::Relation => "relation",
        Class::Open => "open",
        Class::Close => "close",
        Class::Punctuation => "punctuation",
        Class::Function => "function",
        Class::Large => "large",
        Class::Space(_) => "space",
    }
}