696 lines
19 KiB
Rust
696 lines
19 KiB
Rust
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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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let fuel = 20;
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// FIXME: Add support to handle type aliases for builtin scalar types.
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//
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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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validate_type_recursively(ctx, Some(&konst_ty), false, fuel)?;
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let expr = konst.value(ctx.sema.db)?;
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// FIXME: Tuples and other sequence types will be inlined even though
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// they might contain inner block expressions.
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// e.g `(1, { 2 + 3 })` will be inline as it is.
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let value = eval_and_inline_recursively(ctx, &konst, &expr, fuel)?;
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let id = AssistId("inline_const_as_literal", AssistKind::RefactorInline);
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let label = format!("Inline 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 eval_and_inline_recursively(
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ctx: &AssistContext<'_>,
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konst: &hir::Const,
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expr: &ast::Expr,
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fuel: i32,
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) -> Option<String> {
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match (fuel > 0, expr) {
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(true, ast::Expr::BlockExpr(block)) if block.is_standalone() => {
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eval_and_inline_recursively(ctx, konst, &block.tail_expr()?, fuel - 1)
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}
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(_, ast::Expr::Literal(lit)) => Some(lit.to_string()),
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// NOTE: For some expressions, `render_eval` will crash.
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// e.g. `{ &[&[&[&[&[&[10, 20, 30]]]]]] }` will fail for `render_eval`.
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//
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// If these (Ref, Array or Tuple) contain evaluable expression, then we could
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// visit/evaluate/walk them one by one, but I think this is enough for now.
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//
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// Add these if inlining without evaluation is preferred.
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// (_, ast::Expr::RefExpr(expr)) => Some(expr.to_string()),
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// (_, ast::Expr::ArrayExpr(expr)) => Some(expr.to_string()),
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// (_, ast::Expr::TupleExpr(expr)) => Some(expr.to_string()),
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// We should fail on (false, BlockExpr) && is_standalone because we've run out of fuel. BUT
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// what is the harm in trying to evaluate the block anyway? Worst case would be that it
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// behaves differently when for example: fuel = 1
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// > const A: &[u32] = { &[10] }; OK because we inline ref expression.
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// > const B: &[u32] = { { &[10] } }; ERROR because we evaluate block.
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(_, ast::Expr::BlockExpr(_))
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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) => Some(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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}
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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.
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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, `const A: &builtin` is always correct.
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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_array() {
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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}; 1] {{ [{val}] }}
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const ABC: [{ty}; 1] = 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_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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// ----------------------------
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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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#[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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}
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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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),
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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_tuple() {
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// FIXME:
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|
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// const fn abc() -> (i32) { (1) }
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|
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// - results in `1` instead of `(1)`. It handles it as a paren expr
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//
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// const fn abc() -> (&str, &str) { ("a", "a") }
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// - results in `("", "")` instead of `("a", "a")`.
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TEST_PAIRS.into_iter().for_each(|(ty, val, bit)| {
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// Everything except `&str`
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if bit & STR == 0 {
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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}, {ty}) {{ ({val}, {val}) }}
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const ABC: ({ty}, {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}, {ty}) {{ ({val}, {val}) }}
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const ABC: ({ty}, {ty}) = abc();
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fn a() {{ ({val}, {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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|
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#[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, _)| {
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|
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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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),
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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]
|
||
|
|
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: These won't work with `konst.render_eval(ctx.sema.db)`
|
||
|
|
// #[test]
|
||
|
|
// fn inline_const_as_literal_block_slice() {
|
||
|
|
// check_assist(
|
||
|
|
// inline_const_as_literal,
|
||
|
|
// r#"
|
||
|
|
// const ABC: &[&[&[&[&[&[i32]]]]]] = { &[&[&[&[&[&[10, 20, 30]]]]]] };
|
||
|
|
// fn a() { A$0BC }
|
||
|
|
// "#,
|
||
|
|
// r#"
|
||
|
|
// const ABC: &[&[&[&[&[&[i32]]]]]] = { &[&[&[&[&[&[10, 20, 30]]]]]] };
|
||
|
|
// fn a() { &[&[&[&[&[&[10, 20, 30]]]]]] }
|
||
|
|
// "#,
|
||
|
|
// );
|
||
|
|
// }
|
||
|
|
|
||
|
|
// #[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_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_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
|
||
|
|
}
|
||
|
|
"#,
|
||
|
|
);
|
||
|
|
}
|
||
|
|
}
|