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This commit is contained in:
Aleksey Kladov 2021-12-28 19:17:34 +03:00
parent 660cf34d8c
commit ea96c376c8
1 changed files with 18 additions and 44 deletions
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62
crates/ide_ssr/src/fragments.rs
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@ -9,59 +9,19 @@
use syntax::{ast, AstNode, SyntaxNode};
pub(crate) fn ty(s: &str) -> Result<SyntaxNode, ()> {
let template = "type T = {};";
let input = template.replace("{}", s);
let parse = syntax::SourceFile::parse(&input);
if !parse.errors().is_empty() {
return Err(());
}
let node = parse.tree().syntax().descendants().find_map(ast::Type::cast).ok_or(())?;
if node.to_string() != s {
return Err(());
}
Ok(node.syntax().clone_subtree())
fragment::<ast::Type>("type T = {};", s)
}
pub(crate) fn item(s: &str) -> Result<SyntaxNode, ()> {
let template = "{}";
let input = template.replace("{}", s);
let parse = syntax::SourceFile::parse(&input);
if !parse.errors().is_empty() {
return Err(());
}
let node = parse.tree().syntax().descendants().find_map(ast::Item::cast).ok_or(())?;
if node.to_string() != s {
return Err(());
}
Ok(node.syntax().clone_subtree())
fragment::<ast::Item>("{}", s)
}
pub(crate) fn pat(s: &str) -> Result<SyntaxNode, ()> {
let template = "const _: () = {let {} = ();};";
let input = template.replace("{}", s);
let parse = syntax::SourceFile::parse(&input);
if !parse.errors().is_empty() {
return Err(());
}
let node = parse.tree().syntax().descendants().find_map(ast::Pat::cast).ok_or(())?;
if node.to_string() != s {
return Err(());
}
Ok(node.syntax().clone_subtree())
fragment::<ast::Pat>("const _: () = {let {} = ();};", s)
}
pub(crate) fn expr(s: &str) -> Result<SyntaxNode, ()> {
let template = "const _: () = {};";
let input = template.replace("{}", s);
let parse = syntax::SourceFile::parse(&input);
if !parse.errors().is_empty() {
return Err(());
}
let node = parse.tree().syntax().descendants().find_map(ast::Expr::cast).ok_or(())?;
if node.to_string() != s {
return Err(());
}
Ok(node.syntax().clone_subtree())
fragment::<ast::Expr>("const _: () = {};", s)
}
pub(crate) fn stmt(s: &str) -> Result<SyntaxNode, ()> {
@ -82,3 +42,17 @@ pub(crate) fn stmt(s: &str) -> Result<SyntaxNode, ()> {
}
Ok(node.syntax().clone_subtree())
}
fn fragment<T: AstNode>(template: &str, s: &str) -> Result<SyntaxNode, ()> {
let s = s.trim();
let input = template.replace("{}", s);
let parse = syntax::SourceFile::parse(&input);
if !parse.errors().is_empty() {
return Err(());
}
let node = parse.tree().syntax().descendants().find_map(T::cast).ok_or(())?;
if node.syntax().text() != s {
return Err(());
}
Ok(node.syntax().clone_subtree())
}