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//! This module defines an accumulator for completions which are going to be presented to user.
pub(crate) mod attribute;
pub(crate) mod dot;
pub(crate) mod record;
pub(crate) mod pattern;
pub(crate) mod fn_param;
pub(crate) mod keyword;
pub(crate) mod snippet;
pub(crate) mod qualified_path;
pub(crate) mod unqualified_path;
pub(crate) mod postfix;
pub(crate) mod macro_in_item_position;
pub(crate) mod trait_impl;
pub(crate) mod mod_;
pub(crate) mod flyimport;
use std::iter;
use hir::{known, ModPath, ScopeDef, Type};
use crate::{
item::Builder,
render::{
const_::render_const,
enum_variant::render_variant,
function::render_fn,
macro_::render_macro,
pattern::{render_struct_pat, render_variant_pat},
render_field, render_resolution, render_tuple_field,
type_alias::render_type_alias,
RenderContext,
},
CompletionContext, CompletionItem,
};
/// Represents an in-progress set of completions being built.
#[derive(Debug, Default)]
pub struct Completions {
buf: Vec<CompletionItem>,
}
impl Into<Vec<CompletionItem>> for Completions {
fn into(self) -> Vec<CompletionItem> {
self.buf
}
}
impl Builder {
/// Convenience method, which allows to add a freshly created completion into accumulator
/// without binding it to the variable.
pub(crate) fn add_to(self, acc: &mut Completions) {
acc.add(self.build())
}
}
impl Completions {
pub(crate) fn add(&mut self, item: CompletionItem) {
self.buf.push(item)
}
pub(crate) fn add_all<I>(&mut self, items: I)
where
I: IntoIterator,
I::Item: Into<CompletionItem>,
{
items.into_iter().for_each(|item| self.add(item.into()))
}
pub(crate) fn add_field(&mut self, ctx: &CompletionContext, field: hir::Field, ty: &Type) {
let item = render_field(RenderContext::new(ctx), field, ty);
self.add(item);
}
pub(crate) fn add_tuple_field(&mut self, ctx: &CompletionContext, field: usize, ty: &Type) {
let item = render_tuple_field(RenderContext::new(ctx), field, ty);
self.add(item);
}
pub(crate) fn add_resolution(
&mut self,
ctx: &CompletionContext,
local_name: String,
resolution: &ScopeDef,
) {
if let Some(item) = render_resolution(RenderContext::new(ctx), local_name, resolution) {
self.add(item);
}
}
pub(crate) fn add_macro(
&mut self,
ctx: &CompletionContext,
name: Option<String>,
macro_: hir::MacroDef,
) {
let name = match name {
Some(it) => it,
None => return,
};
if let Some(item) = render_macro(RenderContext::new(ctx), None, name, macro_) {
self.add(item);
}
}
pub(crate) fn add_function(
&mut self,
ctx: &CompletionContext,
func: hir::Function,
local_name: Option<String>,
) {
if let Some(item) = render_fn(RenderContext::new(ctx), None, local_name, func) {
self.add(item)
}
}
pub(crate) fn add_variant_pat(
&mut self,
ctx: &CompletionContext,
variant: hir::Variant,
local_name: Option<hir::Name>,
) {
if let Some(item) = render_variant_pat(RenderContext::new(ctx), variant, local_name, None) {
self.add(item);
}
}
pub(crate) fn add_qualified_variant_pat(
&mut self,
ctx: &CompletionContext,
variant: hir::Variant,
path: ModPath,
) {
if let Some(item) = render_variant_pat(RenderContext::new(ctx), variant, None, Some(path)) {
self.add(item);
}
}
pub(crate) fn add_struct_pat(
&mut self,
ctx: &CompletionContext,
strukt: hir::Struct,
local_name: Option<hir::Name>,
) {
if let Some(item) = render_struct_pat(RenderContext::new(ctx), strukt, local_name) {
self.add(item);
}
}
pub(crate) fn add_const(&mut self, ctx: &CompletionContext, constant: hir::Const) {
if let Some(item) = render_const(RenderContext::new(ctx), constant) {
self.add(item);
}
}
pub(crate) fn add_type_alias(&mut self, ctx: &CompletionContext, type_alias: hir::TypeAlias) {
if let Some(item) = render_type_alias(RenderContext::new(ctx), type_alias) {
self.add(item)
}
}
pub(crate) fn add_qualified_enum_variant(
&mut self,
ctx: &CompletionContext,
variant: hir::Variant,
path: ModPath,
) {
let item = render_variant(RenderContext::new(ctx), None, None, variant, Some(path));
self.add(item);
}
pub(crate) fn add_enum_variant(
&mut self,
ctx: &CompletionContext,
variant: hir::Variant,
local_name: Option<String>,
) {
let item = render_variant(RenderContext::new(ctx), None, local_name, variant, None);
self.add(item);
}
}
fn complete_enum_variants(
acc: &mut Completions,
ctx: &CompletionContext,
ty: &hir::Type,
cb: impl Fn(&mut Completions, &CompletionContext, hir::Variant, hir::ModPath),
) {
if let Some(hir::Adt::Enum(enum_data)) =
iter::successors(Some(ty.clone()), |ty| ty.remove_ref()).last().and_then(|ty| ty.as_adt())
{
let variants = enum_data.variants(ctx.db);
let module = if let Some(module) = ctx.scope.module() {
// Compute path from the completion site if available.
module
} else {
// Otherwise fall back to the enum's definition site.
enum_data.module(ctx.db)
};
if let Some(impl_) = ctx.impl_def.as_ref().and_then(|impl_| ctx.sema.to_def(impl_)) {
if impl_.target_ty(ctx.db) == *ty {
for &variant in &variants {
let self_path = hir::ModPath::from_segments(
hir::PathKind::Plain,
iter::once(known::SELF_TYPE).chain(iter::once(variant.name(ctx.db))),
);
cb(acc, ctx, variant, self_path);
}
}
}
for variant in variants {
if let Some(path) = module.find_use_path(ctx.db, hir::ModuleDef::from(variant)) {
// Variants with trivial paths are already added by the existing completion logic,
// so we should avoid adding these twice
if path.segments().len() > 1 {
cb(acc, ctx, variant, path);
}
}
}
}
}
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