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|
use stdx::{format_to, to_lower_snake_case};
use syntax::ast::VisibilityOwner;
use syntax::ast::{self, AstNode, NameOwner};
use crate::{
utils::{find_impl_block_end, find_struct_impl, generate_impl_text},
AssistContext, AssistId, AssistKind, Assists,
};
// Assist: generate_getter_mut
//
// Generate a mut getter method.
//
// ```
// struct Person {
// nam$0e: String,
// }
// ```
// ->
// ```
// struct Person {
// name: String,
// }
//
// impl Person {
// /// Get a mutable reference to the person's name.
// fn name_mut(&mut self) -> &mut String {
// &mut self.name
// }
// }
// ```
pub(crate) fn generate_getter_mut(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
let strukt = ctx.find_node_at_offset::<ast::Struct>()?;
let field = ctx.find_node_at_offset::<ast::RecordField>()?;
let strukt_name = strukt.name()?;
let field_name = field.name()?;
let field_ty = field.ty()?;
// Return early if we've found an existing fn
let fn_name = to_lower_snake_case(&field_name.to_string());
let impl_def = find_struct_impl(
&ctx,
&ast::Adt::Struct(strukt.clone()),
format!("{}_mut", fn_name).as_str(),
)?;
let target = field.syntax().text_range();
acc.add(
AssistId("generate_getter_mut", AssistKind::Generate),
"Generate a mut getter method",
target,
|builder| {
let mut buf = String::with_capacity(512);
let fn_name_spaced = fn_name.replace('_', " ");
let strukt_name_spaced =
to_lower_snake_case(&strukt_name.to_string()).replace('_', " ");
if impl_def.is_some() {
buf.push('\n');
}
let vis = strukt.visibility().map_or(String::new(), |v| format!("{} ", v));
format_to!(
buf,
" /// Get a mutable reference to the {}'s {}.
{}fn {}_mut(&mut self) -> &mut {} {{
&mut self.{}
}}",
strukt_name_spaced,
fn_name_spaced,
vis,
fn_name,
field_ty,
fn_name,
);
let start_offset = impl_def
.and_then(|impl_def| find_impl_block_end(impl_def, &mut buf))
.unwrap_or_else(|| {
buf = generate_impl_text(&ast::Adt::Struct(strukt.clone()), &buf);
strukt.syntax().text_range().end()
});
builder.insert(start_offset, buf);
},
)
}
#[cfg(test)]
mod tests {
use crate::tests::{check_assist, check_assist_not_applicable};
use super::*;
fn check_not_applicable(ra_fixture: &str) {
check_assist_not_applicable(generate_getter_mut, ra_fixture)
}
#[test]
fn test_generate_getter_mut_from_field() {
check_assist(
generate_getter_mut,
r#"
struct Context<T: Clone> {
dat$0a: T,
}"#,
r#"
struct Context<T: Clone> {
data: T,
}
impl<T: Clone> Context<T> {
/// Get a mutable reference to the context's data.
fn data_mut(&mut self) -> &mut T {
&mut self.data
}
}"#,
);
}
#[test]
fn test_generate_getter_mut_already_implemented() {
check_not_applicable(
r#"
struct Context<T: Clone> {
dat$0a: T,
}
impl<T: Clone> Context<T> {
fn data_mut(&mut self) -> &mut T {
&mut self.data
}
}"#,
);
}
#[test]
fn test_generate_getter_mut_from_field_with_visibility_marker() {
check_assist(
generate_getter_mut,
r#"
pub(crate) struct Context<T: Clone> {
dat$0a: T,
}"#,
r#"
pub(crate) struct Context<T: Clone> {
data: T,
}
impl<T: Clone> Context<T> {
/// Get a mutable reference to the context's data.
pub(crate) fn data_mut(&mut self) -> &mut T {
&mut self.data
}
}"#,
);
}
#[test]
fn test_multiple_generate_getter_mut() {
check_assist(
generate_getter_mut,
r#"
struct Context<T: Clone> {
data: T,
cou$0nt: usize,
}
impl<T: Clone> Context<T> {
/// Get a mutable reference to the context's data.
fn data_mut(&mut self) -> &mut T {
&mut self.data
}
}"#,
r#"
struct Context<T: Clone> {
data: T,
count: usize,
}
impl<T: Clone> Context<T> {
/// Get a mutable reference to the context's data.
fn data_mut(&mut self) -> &mut T {
&mut self.data
}
/// Get a mutable reference to the context's count.
fn count_mut(&mut self) -> &mut usize {
&mut self.count
}
}"#,
);
}
}
|
