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Added a constructor for AstNode #105

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Merged
kivikakk merged 1 commit into from
Feb 24, 2019
Merged

Added a constructor for AstNode #105

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14 changes: 14 additions & 0 deletions src/nodes.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -380,8 +380,22 @@ impl Ast {
/// It is bound by the lifetime `'a`, which corresponds to the `Arena` nodes are allocated in.
/// `AstNode`s are almost handled as a reference itself bound by `'a`. Child `Ast`s are wrapped in
/// `RefCell` for interior mutability.
///
/// You can construct a new `AstNode` from a `NodeValue` using the `From` trait:
///
/// ```no_run
/// # use comrak::nodes::{AstNode, NodeValue};
/// let root = AstNode::from(NodeValue::Document);
/// ```
pub type AstNode<'a> = Node<'a, RefCell<Ast>>;

impl<'a> From<NodeValue> for AstNode<'a> {
/// Create a new AST node with the given value.
fn from(value: NodeValue) -> Self {
Node::new(RefCell::new(Ast::new(value)))
}
}

#[doc(hidden)]
pub fn last_child_is_open<'a>(node: &'a AstNode<'a>) -> bool {
node.last_child().map_or(false, |n| n.data.borrow().open)
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