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//! Extensions for `Builder` structure required for item rendering.
use itertools::Itertools;
use crate::{context::CallKind, item::Builder, patterns::ImmediateLocation, CompletionContext};
#[derive(Debug)]
pub(super) enum Params {
Named(Vec<String>),
Anonymous(usize),
}
impl Params {
pub(super) fn len(&self) -> usize {
match self {
Params::Named(xs) => xs.len(),
Params::Anonymous(len) => *len,
}
}
pub(super) fn is_empty(&self) -> bool {
self.len() == 0
}
}
impl Builder {
fn should_add_parens(&self, ctx: &CompletionContext) -> bool {
if !ctx.config.add_call_parenthesis {
return false;
}
if ctx.in_use_tree() {
cov_mark::hit!(no_parens_in_use_item);
return false;
}
if matches!(ctx.path_call_kind(), Some(CallKind::Expr | CallKind::Pat))
| matches!(
ctx.completion_location,
Some(ImmediateLocation::MethodCall { has_parens: true, .. })
)
{
return false;
}
// Don't add parentheses if the expected type is some function reference.
if let Some(ty) = &ctx.expected_type {
if ty.is_fn() {
cov_mark::hit!(no_call_parens_if_fn_ptr_needed);
return false;
}
}
// Nothing prevents us from adding parentheses
true
}
pub(super) fn add_call_parens(
&mut self,
ctx: &CompletionContext,
name: String,
params: Params,
) -> &mut Builder {
if !self.should_add_parens(ctx) {
return self;
}
let cap = match ctx.config.snippet_cap {
Some(it) => it,
None => return self,
};
// If not an import, add parenthesis automatically.
cov_mark::hit!(inserts_parens_for_function_calls);
let (snippet, label) = if params.is_empty() {
(format!("{}()$0", name), format!("{}()", name))
} else {
self.trigger_call_info();
let snippet = match (ctx.config.add_call_argument_snippets, params) {
(true, Params::Named(params)) => {
let function_params_snippet =
params.iter().enumerate().format_with(", ", |(index, param_name), f| {
f(&format_args!("${{{}:{}}}", index + 1, param_name))
});
format!("{}({})$0", name, function_params_snippet)
}
_ => {
cov_mark::hit!(suppress_arg_snippets);
format!("{}($0)", name)
}
};
(snippet, format!("{}(…)", name))
};
self.lookup_by(name).label(label).insert_snippet(cap, snippet)
}
}
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