use std::sync::Arc;
use {
    ast,
    SyntaxNode, SyntaxRoot, TreeRoot, AstNode,
    SyntaxKind::*,
};
{% for node, methods in ast %}
// {{ node }}
{%- if methods.enum %}
#[derive(Debug, Clone, Copy)]
pub enum {{ node }}<R: TreeRoot = Arc<SyntaxRoot>> {
{%- for kind in methods.enum %}
    {{ kind }}({{ kind }}<R>),
{%- endfor %}
}

impl<R: TreeRoot> AstNode<R> for {{ node }}<R> {
    fn cast(syntax: SyntaxNode<R>) -> Option<Self> {
        match syntax.kind() {
{%- for kind in methods.enum %}
            {{ kind | SCREAM }} => Some({{ node }}::{{ kind }}({{ kind }} { syntax })),
{%- endfor %}
            _ => None,
        }
    }
    fn syntax(&self) -> &SyntaxNode<R> {
        match self {
{%- for kind in methods.enum %}
            {{ node }}::{{ kind }}(inner) => inner.syntax(),
{%- endfor %}
        }
    }
}
{% else %}
#[derive(Debug, Clone, Copy)]
pub struct {{ node }}<R: TreeRoot = Arc<SyntaxRoot>> {
    syntax: SyntaxNode<R>,
}

impl<R: TreeRoot> AstNode<R> for {{ node }}<R> {
    fn cast(syntax: SyntaxNode<R>) -> Option<Self> {
        match syntax.kind() {
            {{ node | SCREAM }} => Some({{ node }} { syntax }),
            _ => None,
        }
    }
    fn syntax(&self) -> &SyntaxNode<R> { &self.syntax }
}
{% endif %}
{% if methods.traits -%}
{%- for t in methods.traits -%}
impl<R: TreeRoot> ast::{{ t }}<R> for {{ node }}<R> {}
{% endfor -%}
{%- endif -%}

impl<R: TreeRoot> {{ node }}<R> {
{%- if methods.collections -%}
{%- for m in methods.collections -%}
{%- set method_name = m.0 -%}
{%- set ChildName = m.1 %}
    pub fn {{ method_name }}<'a>(&'a self) -> impl Iterator<Item = {{ ChildName }}<R>> + 'a {
        self.syntax()
            .children()
            .filter_map({{ ChildName }}::cast)
    }
{% endfor -%}
{%- endif -%}

{%- if methods.options -%}
{%- for m in methods.options -%}
{%- set method_name = m.0 -%}
{%- set ChildName = m.1 %}
    pub fn {{ method_name }}(&self) -> Option<{{ ChildName }}<R>> {
        self.syntax()
            .children()
            .filter_map({{ ChildName }}::cast)
            .next()
    }
{% endfor -%}
{%- endif -%}
}
{% endfor %}