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//! This module provides functionality for querying callable information about a token.
use either::Either;
use hir::{Semantics, Type};
use syntax::{
ast::{self, HasArgList, HasName},
AstNode, SyntaxToken,
};
use crate::RootDatabase;
#[derive(Debug)]
pub struct ActiveParameter {
pub ty: Type,
pub pat: Option<Either<ast::SelfParam, ast::Pat>>,
}
impl ActiveParameter {
/// Returns information about the call argument this token is part of.
pub fn at_token(sema: &Semantics<'_, RootDatabase>, token: SyntaxToken) -> Option<Self> {
let (signature, active_parameter) = callable_for_token(sema, token)?;
let idx = active_parameter?;
let mut params = signature.params(sema.db);
if !(idx < params.len()) {
cov_mark::hit!(too_many_arguments);
return None;
}
let (pat, ty) = params.swap_remove(idx);
Some(ActiveParameter { ty, pat })
}
pub fn ident(&self) -> Option<ast::Name> {
self.pat.as_ref().and_then(|param| match param {
Either::Right(ast::Pat::IdentPat(ident)) => ident.name(),
_ => None,
})
}
}
/// Returns a [`hir::Callable`] this token is a part of and its argument index of said callable.
pub fn callable_for_token(
sema: &Semantics<'_, RootDatabase>,
token: SyntaxToken,
) -> Option<(hir::Callable, Option<usize>)> {
// Find the calling expression and its NameRef
let parent = token.parent()?;
let calling_node = parent.ancestors().filter_map(ast::CallableExpr::cast).find(|it| {
it.arg_list()
.map_or(false, |it| it.syntax().text_range().contains(token.text_range().start()))
})?;
callable_for_node(sema, &calling_node, &token)
}
pub fn callable_for_node(
sema: &Semantics<'_, RootDatabase>,
calling_node: &ast::CallableExpr,
token: &SyntaxToken,
) -> Option<(hir::Callable, Option<usize>)> {
let callable = match &calling_node {
ast::CallableExpr::Call(call) => {
let expr = call.expr()?;
sema.type_of_expr(&expr)?.adjusted().as_callable(sema.db)
}
ast::CallableExpr::MethodCall(call) => sema.resolve_method_call_as_callable(call),
}?;
let active_param = if let Some(arg_list) = calling_node.arg_list() {
let param = arg_list
.args()
.take_while(|arg| arg.syntax().text_range().end() <= token.text_range().start())
.count();
Some(param)
} else {
None
};
Some((callable, active_param))
}
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