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Auto merge of #14925 - viktorlott:inline-const-expr-as-static-str, r=HKalbasi
feat: inline const as literal
Assist: inline_const_as_literal
Evaluate and inline const variable as literal.
```rust
const STRING: &str = "Hello, World!";
fn something() -> &'static str {
STR$0ING
}
```
->
```rust
const STRING: &str = "Hello, World!";
fn something() -> &'static str {
"Hello, World!"
}
```
This commit is contained in:
bors
commit
058e2d2bdd
5 changed files with 754 additions and 2 deletions
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@ -3494,6 +3494,14 @@ impl Type {
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}
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}
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pub fn is_scalar(&self) -> bool {
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matches!(self.ty.kind(Interner), TyKind::Scalar(_))
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}
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pub fn is_tuple(&self) -> bool {
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matches!(self.ty.kind(Interner), TyKind::Tuple(..))
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}
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pub fn remove_ref(&self) -> Option<Type> {
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match &self.ty.kind(Interner) {
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TyKind::Ref(.., ty) => Some(self.derived(ty.clone())),
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|
|
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722
crates/ide-assists/src/handlers/inline_const_as_literal.rs
Normal file
722
crates/ide-assists/src/handlers/inline_const_as_literal.rs
Normal file
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@ -0,0 +1,722 @@
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use syntax::{ast, AstNode};
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use crate::{AssistContext, AssistId, AssistKind, Assists};
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// Assist: inline_const_as_literal
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//
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// Evaluate and inline const variable as literal.
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//
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// ```
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// const STRING: &str = "Hello, World!";
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//
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// fn something() -> &'static str {
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// STRING$0
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// }
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// ```
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// ->
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// ```
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// const STRING: &str = "Hello, World!";
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//
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// fn something() -> &'static str {
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// "Hello, World!"
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// }
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// ```
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pub(crate) fn inline_const_as_literal(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
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let variable = ctx.find_node_at_offset::<ast::PathExpr>()?;
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if let hir::PathResolution::Def(hir::ModuleDef::Const(konst)) =
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ctx.sema.resolve_path(&variable.path()?)?
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{
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let konst_ty = konst.ty(ctx.sema.db);
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// Used as the upper limit for recursive calls if no TCO is available
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let fuel = 20;
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// There is no way to have a const static reference to a type that contains a interior
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// mutability cell.
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// FIXME: Add support to handle type aliases for builtin scalar types.
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validate_type_recursively(ctx, Some(&konst_ty), false, fuel)?;
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let expr = konst.value(ctx.sema.db)?;
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let value = match expr {
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ast::Expr::BlockExpr(_)
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| ast::Expr::Literal(_)
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| ast::Expr::RefExpr(_)
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| ast::Expr::ArrayExpr(_)
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| ast::Expr::TupleExpr(_)
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| ast::Expr::IfExpr(_)
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| ast::Expr::ParenExpr(_)
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| ast::Expr::MatchExpr(_)
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| ast::Expr::MacroExpr(_)
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| ast::Expr::BinExpr(_)
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| ast::Expr::CallExpr(_) => match konst.render_eval(ctx.sema.db) {
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Ok(result) => result,
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Err(_) => return None,
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},
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_ => return None,
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};
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let id = AssistId("inline_const_as_literal", AssistKind::RefactorInline);
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let label = format!("Inline const as literal");
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let target = variable.syntax().text_range();
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return acc.add(id, label, target, |edit| {
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edit.replace(variable.syntax().text_range(), value);
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});
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}
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None
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}
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fn validate_type_recursively(
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ctx: &AssistContext<'_>,
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ty_hir: Option<&hir::Type>,
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refed: bool,
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fuel: i32,
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) -> Option<()> {
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match (fuel > 0, ty_hir) {
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(true, Some(ty)) if ty.is_reference() => validate_type_recursively(
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ctx,
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ty.as_reference().map(|(ty, _)| ty).as_ref(),
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true,
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// FIXME: Saving fuel when `&` repeating might not be a good idea if there's no TCO.
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if refed { fuel } else { fuel - 1 },
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),
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(true, Some(ty)) if ty.is_array() => validate_type_recursively(
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ctx,
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ty.as_array(ctx.db()).map(|(ty, _)| ty).as_ref(),
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false,
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fuel - 1,
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),
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(true, Some(ty)) if ty.is_tuple() => ty
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.tuple_fields(ctx.db())
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.iter()
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.all(|ty| validate_type_recursively(ctx, Some(ty), false, fuel - 1).is_some())
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.then_some(()),
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(true, Some(ty)) if refed && ty.is_slice() => {
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validate_type_recursively(ctx, ty.as_slice().as_ref(), false, fuel - 1)
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}
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(_, Some(ty)) => match ty.as_builtin() {
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// `const A: str` is not correct, but `const A: &builtin` is.
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Some(builtin) if refed || (!refed && !builtin.is_str()) => Some(()),
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_ => None,
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},
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_ => None,
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::tests::{check_assist, check_assist_not_applicable};
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const NUMBER: u8 = 1;
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const BOOL: u8 = 2;
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const STR: u8 = 4;
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const CHAR: u8 = 8;
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const TEST_PAIRS: &[(&str, &str, u8)] = &[
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("u8", "0", NUMBER),
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("u16", "0", NUMBER),
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("u32", "0", NUMBER),
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("u64", "0", NUMBER),
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("u128", "0", NUMBER),
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("usize", "0", NUMBER),
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("i8", "0", NUMBER),
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("i16", "0", NUMBER),
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("i32", "0", NUMBER),
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("i64", "0", NUMBER),
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("i128", "0", NUMBER),
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("isize", "0", NUMBER),
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("bool", "false", BOOL),
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("&str", "\"str\"", STR),
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("char", "'c'", CHAR),
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];
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// -----------Not supported-----------
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#[test]
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fn inline_const_as_literal_const_fn_call_slice() {
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TEST_PAIRS.into_iter().for_each(|(ty, val, _)| {
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check_assist_not_applicable(
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inline_const_as_literal,
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&format!(
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r#"
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const fn abc() -> &[{ty}] {{ &[{val}] }}
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const ABC: &[{ty}] = abc();
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fn a() {{ A$0BC }}
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"#
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),
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);
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});
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}
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#[test]
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fn inline_const_as_literal_expr_as_str_lit_not_applicable_const() {
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check_assist_not_applicable(
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inline_const_as_literal,
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r#"
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const STR$0ING: &str = "Hello, World!";
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fn something() -> &'static str {
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STRING
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}
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"#,
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);
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}
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#[test]
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fn inline_const_as_struct_() {
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check_assist_not_applicable(
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inline_const_as_literal,
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r#"
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struct A;
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const STRUKT: A = A;
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fn something() -> A {
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STRU$0KT
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}
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"#,
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);
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}
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#[test]
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fn inline_const_as_enum_() {
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check_assist_not_applicable(
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inline_const_as_literal,
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r#"
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enum A { A, B, C }
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const ENUM: A = A::A;
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fn something() -> A {
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EN$0UM
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}
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"#,
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);
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}
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#[test]
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fn inline_const_as_tuple_closure() {
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check_assist_not_applicable(
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inline_const_as_literal,
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r#"
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const CLOSURE: (&dyn Fn(i32) -> i32) = (&|num| -> i32 { num });
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fn something() -> (&dyn Fn(i32) -> i32) {
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STRU$0KT
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}
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"#,
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);
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}
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#[test]
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fn inline_const_as_closure_() {
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check_assist_not_applicable(
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inline_const_as_literal,
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r#"
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const CLOSURE: &dyn Fn(i32) -> i32 = &|num| -> i32 { num };
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fn something() -> &dyn Fn(i32) -> i32 {
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STRU$0KT
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}
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"#,
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);
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}
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#[test]
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fn inline_const_as_fn_() {
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check_assist_not_applicable(
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inline_const_as_literal,
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r#"
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struct S(i32);
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const CON: fn(i32) -> S = S;
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fn something() {
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let x = CO$0N;
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}
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"#,
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);
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}
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// ----------------------------
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#[test]
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fn inline_const_as_literal_const_expr() {
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TEST_PAIRS.into_iter().for_each(|(ty, val, _)| {
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check_assist(
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inline_const_as_literal,
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&format!(
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r#"
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const ABC: {ty} = {val};
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fn a() {{ A$0BC }}
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"#
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),
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&format!(
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r#"
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const ABC: {ty} = {val};
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fn a() {{ {val} }}
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"#
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),
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);
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});
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}
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#[test]
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fn inline_const_as_literal_const_block_expr() {
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TEST_PAIRS.into_iter().for_each(|(ty, val, _)| {
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check_assist(
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inline_const_as_literal,
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&format!(
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r#"
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const ABC: {ty} = {{ {val} }};
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fn a() {{ A$0BC }}
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"#
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),
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&format!(
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r#"
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const ABC: {ty} = {{ {val} }};
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fn a() {{ {val} }}
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"#
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),
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);
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});
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}
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#[test]
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fn inline_const_as_literal_const_block_eval_expr() {
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TEST_PAIRS.into_iter().for_each(|(ty, val, _)| {
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check_assist(
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inline_const_as_literal,
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&format!(
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r#"
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const ABC: {ty} = {{ true; {val} }};
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fn a() {{ A$0BC }}
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"#
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),
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&format!(
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r#"
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const ABC: {ty} = {{ true; {val} }};
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fn a() {{ {val} }}
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"#
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),
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);
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});
|
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}
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|
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#[test]
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fn inline_const_as_literal_const_block_eval_block_expr() {
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TEST_PAIRS.into_iter().for_each(|(ty, val, _)| {
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check_assist(
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inline_const_as_literal,
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&format!(
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r#"
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const ABC: {ty} = {{ true; {{ {val} }} }};
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fn a() {{ A$0BC }}
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"#
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),
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&format!(
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r#"
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const ABC: {ty} = {{ true; {{ {val} }} }};
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fn a() {{ {val} }}
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"#
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||||
),
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||||
);
|
||||
});
|
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}
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|
||||
#[test]
|
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fn inline_const_as_literal_const_fn_call_block_nested_builtin() {
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TEST_PAIRS.into_iter().for_each(|(ty, val, _)| {
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check_assist(
|
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inline_const_as_literal,
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&format!(
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r#"
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const fn abc() -> {ty} {{ {{ {{ {{ {val} }} }} }} }}
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const ABC: {ty} = abc();
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fn a() {{ A$0BC }}
|
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"#
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||||
),
|
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&format!(
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r#"
|
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const fn abc() -> {ty} {{ {{ {{ {{ {val} }} }} }} }}
|
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const ABC: {ty} = abc();
|
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fn a() {{ {val} }}
|
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"#
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||||
),
|
||||
);
|
||||
});
|
||||
}
|
||||
|
||||
#[test]
|
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fn inline_const_as_literal_const_fn_call_tuple() {
|
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TEST_PAIRS.into_iter().for_each(|(ty, val, _)| {
|
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check_assist(
|
||||
inline_const_as_literal,
|
||||
&format!(
|
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r#"
|
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const fn abc() -> ({ty}, {ty}) {{ ({val}, {val}) }}
|
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const ABC: ({ty}, {ty}) = abc();
|
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fn a() {{ A$0BC }}
|
||||
"#
|
||||
),
|
||||
&format!(
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r#"
|
||||
const fn abc() -> ({ty}, {ty}) {{ ({val}, {val}) }}
|
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const ABC: ({ty}, {ty}) = abc();
|
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fn a() {{ ({val}, {val}) }}
|
||||
"#
|
||||
),
|
||||
);
|
||||
});
|
||||
}
|
||||
|
||||
#[test]
|
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fn inline_const_as_literal_const_fn_call_builtin() {
|
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TEST_PAIRS.into_iter().for_each(|(ty, val, _)| {
|
||||
check_assist(
|
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inline_const_as_literal,
|
||||
&format!(
|
||||
r#"
|
||||
const fn abc() -> {ty} {{ {val} }}
|
||||
const ABC: {ty} = abc();
|
||||
fn a() {{ A$0BC }}
|
||||
"#
|
||||
),
|
||||
&format!(
|
||||
r#"
|
||||
const fn abc() -> {ty} {{ {val} }}
|
||||
const ABC: {ty} = abc();
|
||||
fn a() {{ {val} }}
|
||||
"#
|
||||
),
|
||||
);
|
||||
});
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_scalar_operators() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const ABC: i32 = 1 + 2 + 3;
|
||||
fn a() { A$0BC }
|
||||
"#,
|
||||
r#"
|
||||
const ABC: i32 = 1 + 2 + 3;
|
||||
fn a() { 6 }
|
||||
"#,
|
||||
);
|
||||
}
|
||||
#[test]
|
||||
fn inline_const_as_literal_block_scalar_calculate_expr() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const ABC: i32 = { 1 + 2 + 3 };
|
||||
fn a() { A$0BC }
|
||||
"#,
|
||||
r#"
|
||||
const ABC: i32 = { 1 + 2 + 3 };
|
||||
fn a() { 6 }
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_block_scalar_calculate_param_expr() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const ABC: i32 = { (1 + 2 + 3) };
|
||||
fn a() { A$0BC }
|
||||
"#,
|
||||
r#"
|
||||
const ABC: i32 = { (1 + 2 + 3) };
|
||||
fn a() { 6 }
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_block_tuple_scalar_calculate_block_expr() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const ABC: (i32, i32) = { (1, { 2 + 3 }) };
|
||||
fn a() { A$0BC }
|
||||
"#,
|
||||
r#"
|
||||
const ABC: (i32, i32) = { (1, { 2 + 3 }) };
|
||||
fn a() { (1, 5) }
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
// FIXME: Add support for nested ref slices when using `render_eval`
|
||||
#[test]
|
||||
fn inline_const_as_literal_block_slice() {
|
||||
check_assist_not_applicable(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const ABC: &[&[&[&[&[&[i32]]]]]] = { &[&[&[&[&[&[10, 20, 30]]]]]] };
|
||||
fn a() { A$0BC }
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
// FIXME: Add support for unary tuple expressions when using `render_eval`.
|
||||
// `const fn abc() -> (i32) { (1) }` will results in `1` instead of `(1)` because it's evaluated
|
||||
// as a paren expr.
|
||||
#[test]
|
||||
fn inline_const_as_literal_block_tuple() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const ABC: (([i32; 3]), (i32), ((&str, i32), i32), i32) = { (([1, 2, 3]), (10), (("hello", 10), 20), 30) };
|
||||
fn a() { A$0BC }
|
||||
"#,
|
||||
r#"
|
||||
const ABC: (([i32; 3]), (i32), ((&str, i32), i32), i32) = { (([1, 2, 3]), (10), (("hello", 10), 20), 30) };
|
||||
fn a() { ([1, 2, 3], 10, (("hello", 10), 20), 30) }
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_block_slice_single() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const ABC: [i32; 1] = { [10] };
|
||||
fn a() { A$0BC }
|
||||
"#,
|
||||
r#"
|
||||
const ABC: [i32; 1] = { [10] };
|
||||
fn a() { [10] }
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_block_array() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const ABC: [[[i32; 1]; 1]; 1] = { [[[10]]] };
|
||||
fn a() { A$0BC }
|
||||
"#,
|
||||
r#"
|
||||
const ABC: [[[i32; 1]; 1]; 1] = { [[[10]]] };
|
||||
fn a() { [[[10]]] }
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_block_recursive() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const ABC: &str = { { { { "hello" } } } };
|
||||
fn a() { A$0BC }
|
||||
"#,
|
||||
r#"
|
||||
const ABC: &str = { { { { "hello" } } } };
|
||||
fn a() { "hello" }
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_expr_as_str_lit() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const STRING: &str = "Hello, World!";
|
||||
|
||||
fn something() -> &'static str {
|
||||
STR$0ING
|
||||
}
|
||||
"#,
|
||||
r#"
|
||||
const STRING: &str = "Hello, World!";
|
||||
|
||||
fn something() -> &'static str {
|
||||
"Hello, World!"
|
||||
}
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_eval_const_block_expr_to_str_lit() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const STRING: &str = {
|
||||
let x = 9;
|
||||
if x + 10 == 21 {
|
||||
"Hello, World!"
|
||||
} else {
|
||||
"World, Hello!"
|
||||
}
|
||||
};
|
||||
|
||||
fn something() -> &'static str {
|
||||
STR$0ING
|
||||
}
|
||||
"#,
|
||||
r#"
|
||||
const STRING: &str = {
|
||||
let x = 9;
|
||||
if x + 10 == 21 {
|
||||
"Hello, World!"
|
||||
} else {
|
||||
"World, Hello!"
|
||||
}
|
||||
};
|
||||
|
||||
fn something() -> &'static str {
|
||||
"World, Hello!"
|
||||
}
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_eval_const_block_macro_expr_to_str_lit() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
macro_rules! co {() => {"World, Hello!"};}
|
||||
const STRING: &str = { co!() };
|
||||
|
||||
fn something() -> &'static str {
|
||||
STR$0ING
|
||||
}
|
||||
"#,
|
||||
r#"
|
||||
macro_rules! co {() => {"World, Hello!"};}
|
||||
const STRING: &str = { co!() };
|
||||
|
||||
fn something() -> &'static str {
|
||||
"World, Hello!"
|
||||
}
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_eval_const_match_expr_to_str_lit() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const STRING: &str = match 9 + 10 {
|
||||
0..18 => "Hello, World!",
|
||||
_ => "World, Hello!"
|
||||
};
|
||||
|
||||
fn something() -> &'static str {
|
||||
STR$0ING
|
||||
}
|
||||
"#,
|
||||
r#"
|
||||
const STRING: &str = match 9 + 10 {
|
||||
0..18 => "Hello, World!",
|
||||
_ => "World, Hello!"
|
||||
};
|
||||
|
||||
fn something() -> &'static str {
|
||||
"World, Hello!"
|
||||
}
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_eval_const_if_expr_to_str_lit() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const STRING: &str = if 1 + 2 == 4 {
|
||||
"Hello, World!"
|
||||
} else {
|
||||
"World, Hello!"
|
||||
}
|
||||
|
||||
fn something() -> &'static str {
|
||||
STR$0ING
|
||||
}
|
||||
"#,
|
||||
r#"
|
||||
const STRING: &str = if 1 + 2 == 4 {
|
||||
"Hello, World!"
|
||||
} else {
|
||||
"World, Hello!"
|
||||
}
|
||||
|
||||
fn something() -> &'static str {
|
||||
"World, Hello!"
|
||||
}
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_eval_const_macro_expr_to_str_lit() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
macro_rules! co {() => {"World, Hello!"};}
|
||||
const STRING: &str = co!();
|
||||
|
||||
fn something() -> &'static str {
|
||||
STR$0ING
|
||||
}
|
||||
"#,
|
||||
r#"
|
||||
macro_rules! co {() => {"World, Hello!"};}
|
||||
const STRING: &str = co!();
|
||||
|
||||
fn something() -> &'static str {
|
||||
"World, Hello!"
|
||||
}
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_eval_const_call_expr_to_str_lit() {
|
||||
check_assist(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const fn const_call() -> &'static str {"World, Hello!"}
|
||||
const STRING: &str = const_call();
|
||||
|
||||
fn something() -> &'static str {
|
||||
STR$0ING
|
||||
}
|
||||
"#,
|
||||
r#"
|
||||
const fn const_call() -> &'static str {"World, Hello!"}
|
||||
const STRING: &str = const_call();
|
||||
|
||||
fn something() -> &'static str {
|
||||
"World, Hello!"
|
||||
}
|
||||
"#,
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn inline_const_as_literal_expr_as_str_lit_not_applicable() {
|
||||
check_assist_not_applicable(
|
||||
inline_const_as_literal,
|
||||
r#"
|
||||
const STRING: &str = "Hello, World!";
|
||||
|
||||
fn something() -> &'static str {
|
||||
STRING $0
|
||||
}
|
||||
"#,
|
||||
);
|
||||
}
|
||||
}
|
||||
|
|
@ -158,9 +158,8 @@ pub(crate) fn remove_hash(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<
|
|||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use crate::tests::{check_assist, check_assist_not_applicable, check_assist_target};
|
||||
|
||||
use super::*;
|
||||
use crate::tests::{check_assist, check_assist_not_applicable, check_assist_target};
|
||||
|
||||
#[test]
|
||||
fn make_raw_string_target() {
|
||||
|
|
|
|||
|
|
@ -161,6 +161,7 @@ mod handlers {
|
|||
mod generate_delegate_methods;
|
||||
mod add_return_type;
|
||||
mod inline_call;
|
||||
mod inline_const_as_literal;
|
||||
mod inline_local_variable;
|
||||
mod inline_macro;
|
||||
mod inline_type_alias;
|
||||
|
|
@ -265,6 +266,7 @@ mod handlers {
|
|||
generate_new::generate_new,
|
||||
inline_call::inline_call,
|
||||
inline_call::inline_into_callers,
|
||||
inline_const_as_literal::inline_const_as_literal,
|
||||
inline_local_variable::inline_local_variable,
|
||||
inline_type_alias::inline_type_alias,
|
||||
inline_type_alias::inline_type_alias_uses,
|
||||
|
|
|
|||
|
|
@ -1479,6 +1479,27 @@ fn foo(name: Option<&str>) {
|
|||
)
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn doctest_inline_const_as_literal() {
|
||||
check_doc_test(
|
||||
"inline_const_as_literal",
|
||||
r#####"
|
||||
const STRING: &str = "Hello, World!";
|
||||
|
||||
fn something() -> &'static str {
|
||||
STRING$0
|
||||
}
|
||||
"#####,
|
||||
r#####"
|
||||
const STRING: &str = "Hello, World!";
|
||||
|
||||
fn something() -> &'static str {
|
||||
"Hello, World!"
|
||||
}
|
||||
"#####,
|
||||
)
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn doctest_inline_into_callers() {
|
||||
check_doc_test(
|
||||
|
|
|
|||
Loading…
Reference in a new issue