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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, find_struct_impl, generate_impl_text},
AssistContext, AssistId, AssistKind, Assists,
};
// Assist: generate_getter
//
// Generate a getter method.
//
// ```
// struct Person {
// nam$0e: String,
// }
// ```
// ->
// ```
// struct Person {
// name: String,
// }
//
// impl Person {
// /// Get a reference to the person's name.
// fn name(&self) -> &String {
// &self.name
// }
// }
// ```
pub(crate) fn generate_getter(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()), fn_name.as_str())?;
let target = field.syntax().text_range();
acc.add(
AssistId("generate_getter", AssistKind::Generate),
"Generate a 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 reference to the {}'s {}.
{}fn {}(&self) -> &{} {{
&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(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, ra_fixture)
}
#[test]
fn test_generate_getter_from_field() {
check_assist(
generate_getter,
r#"
struct Context<T: Clone> {
dat$0a: T,
}"#,
r#"
struct Context<T: Clone> {
data: T,
}
impl<T: Clone> Context<T> {
/// Get a reference to the context's data.
fn data(&self) -> &T {
&self.data
}
}"#,
);
}
#[test]
fn test_generate_getter_already_implemented() {
check_not_applicable(
r#"
struct Context<T: Clone> {
dat$0a: T,
}
impl<T: Clone> Context<T> {
fn data(&self) -> &T {
&self.data
}
}"#,
);
}
#[test]
fn test_generate_getter_from_field_with_visibility_marker() {
check_assist(
generate_getter,
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 reference to the context's data.
pub(crate) fn data(&self) -> &T {
&self.data
}
}"#,
);
}
}
|
