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use ra_syntax::{ast, AstNode, SyntaxNode, SyntaxKind::*};
pub fn ast_to_token_tree(ast: &ast::TokenTree) -> Option<tt::Subtree> {
convert_tt(ast.syntax())
}
fn convert_tt(tt: &SyntaxNode) -> Option<tt::Subtree> {
let first_child = tt.first_child()?;
let last_child = tt.last_child()?;
let delimiter = match (first_child.kind(), last_child.kind()) {
(L_PAREN, R_PAREN) => tt::Delimiter::Parenthesis,
(L_CURLY, R_CURLY) => tt::Delimiter::Brace,
(L_BRACK, R_BRACK) => tt::Delimiter::Bracket,
_ => return None,
};
let mut token_trees = Vec::new();
for child in tt.children().skip(1) {
if child == first_child || child == last_child || child.kind().is_trivia() {
continue;
}
if child.kind().is_punct() {
let mut prev = None;
for char in child.leaf_text().unwrap().chars() {
if let Some(char) = prev {
token_trees.push(
tt::Leaf::from(tt::Punct { char, spacing: tt::Spacing::Joint }).into(),
);
}
prev = Some(char)
}
if let Some(char) = prev {
token_trees
.push(tt::Leaf::from(tt::Punct { char, spacing: tt::Spacing::Alone }).into());
}
} else {
let child: tt::TokenTree = if child.kind() == TOKEN_TREE {
convert_tt(child)?.into()
} else if child.kind().is_keyword() || child.kind() == IDENT {
let text = child.leaf_text().unwrap().clone();
tt::Leaf::from(tt::Ident { text }).into()
} else if child.kind().is_literal() {
tt::Leaf::from(tt::Literal { text: child.leaf_text().unwrap().clone() }).into()
} else {
return None;
};
token_trees.push(child)
}
}
let res = tt::Subtree { delimiter, token_trees };
Some(res)
}
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