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//! Renderer for patterns.
use hir::{db::HirDatabase, HasAttrs, HasVisibility, Name, StructKind};
use ide_db::helpers::SnippetCap;
use itertools::Itertools;
use crate::{item::CompletionKind, render::RenderContext, CompletionItem, CompletionItemKind};
fn visible_fields(
ctx: &RenderContext<'_>,
fields: &[hir::Field],
item: impl HasAttrs,
) -> Option<(Vec<hir::Field>, bool)> {
let module = ctx.completion.scope.module()?;
let n_fields = fields.len();
let fields = fields
.into_iter()
.filter(|field| field.is_visible_from(ctx.db(), module))
.copied()
.collect::<Vec<_>>();
let fields_omitted =
n_fields - fields.len() > 0 || item.attrs(ctx.db()).by_key("non_exhaustive").exists();
Some((fields, fields_omitted))
}
pub(crate) fn render_struct_pat(
ctx: RenderContext<'_>,
strukt: hir::Struct,
local_name: Option<Name>,
) -> Option<CompletionItem> {
let _p = profile::span("render_struct_pat");
let fields = strukt.fields(ctx.db());
let (visible_fields, fields_omitted) = visible_fields(&ctx, &fields, strukt)?;
if visible_fields.is_empty() {
// Matching a struct without matching its fields is pointless, unlike matching a Variant without its fields
return None;
}
let name = local_name.unwrap_or_else(|| strukt.name(ctx.db())).to_string();
let pat = render_pat(&ctx, &name, strukt.kind(ctx.db()), &visible_fields, fields_omitted)?;
Some(build_completion(ctx, name, pat, strukt))
}
pub(crate) fn render_variant_pat(
ctx: RenderContext<'_>,
variant: hir::Variant,
local_name: Option<Name>,
path: Option<hir::ModPath>,
) -> Option<CompletionItem> {
let _p = profile::span("render_variant_pat");
let fields = variant.fields(ctx.db());
let (visible_fields, fields_omitted) = visible_fields(&ctx, &fields, variant)?;
let name = match &path {
Some(path) => path.to_string(),
None => local_name.unwrap_or_else(|| variant.name(ctx.db())).to_string(),
};
let pat = render_pat(&ctx, &name, variant.kind(ctx.db()), &visible_fields, fields_omitted)?;
Some(build_completion(ctx, name, pat, variant))
}
fn build_completion(
ctx: RenderContext<'_>,
name: String,
pat: String,
item: impl HasAttrs + Copy,
) -> CompletionItem {
let completion = CompletionItem::new(CompletionKind::Snippet, ctx.source_range(), name)
.kind(CompletionItemKind::Binding)
.set_documentation(ctx.docs(item))
.set_deprecated(ctx.is_deprecated(item))
.detail(&pat);
let completion = if let Some(snippet_cap) = ctx.snippet_cap() {
completion.insert_snippet(snippet_cap, pat)
} else {
completion.insert_text(pat)
};
completion.build()
}
fn render_pat(
ctx: &RenderContext<'_>,
name: &str,
kind: StructKind,
fields: &[hir::Field],
fields_omitted: bool,
) -> Option<String> {
let mut pat = match kind {
StructKind::Tuple if ctx.snippet_cap().is_some() => {
render_tuple_as_pat(&fields, &name, fields_omitted)
}
StructKind::Record => {
render_record_as_pat(ctx.db(), ctx.snippet_cap(), &fields, &name, fields_omitted)
}
_ => return None,
};
if ctx.completion.is_param {
pat.push(':');
pat.push(' ');
pat.push_str(&name);
}
if ctx.snippet_cap().is_some() {
pat.push_str("$0");
}
Some(pat)
}
fn render_record_as_pat(
db: &dyn HirDatabase,
snippet_cap: Option<SnippetCap>,
fields: &[hir::Field],
name: &str,
fields_omitted: bool,
) -> String {
let fields = fields.iter();
if snippet_cap.is_some() {
format!(
"{name} {{ {}{} }}",
fields
.enumerate()
.map(|(idx, field)| format!("{}${}", field.name(db), idx + 1))
.format(", "),
if fields_omitted { ", .." } else { "" },
name = name
)
} else {
format!(
"{name} {{ {}{} }}",
fields.map(|field| field.name(db)).format(", "),
if fields_omitted { ", .." } else { "" },
name = name
)
}
}
fn render_tuple_as_pat(fields: &[hir::Field], name: &str, fields_omitted: bool) -> String {
format!(
"{name}({}{})",
fields.iter().enumerate().map(|(idx, _)| format!("${}", idx + 1)).format(", "),
if fields_omitted { ", .." } else { "" },
name = name
)
}
|
