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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import SwiftSyntax
@_spi(Experimental) public protocol WithGenericParametersScopeSyntax: ScopeSyntax {
var genericParameterClause: GenericParameterClauseSyntax? { get }
func returningLookupFromGenericParameterScope(
_ identifier: Identifier?,
at lookUpPosition: AbsolutePosition,
with config: LookupConfig
) -> [LookupResult]
}
@_spi(Experimental) extension WithGenericParametersScopeSyntax {
/// Returns names matching lookup and passes lookup to
/// the generic parameter clause scopes.
///
/// ### Example
/// ```swift
/// let a = 23
/// func foo<A>(a: A) {
/// a // <-- start lookup here
/// }
/// ```
/// When starting lookup at the `a` reference,
/// lookup first visits the code block scope associated
/// with the function's body. Then, it's forwarded to the
/// function declaration scope and then to generic parameter
/// scope (`WithGenericParametersScopeSyntax`)
/// instead of it's actual parent scope (in this case: file scope).
@_spi(Experimental) public func lookup(
_ identifier: Identifier?,
at lookUpPosition: AbsolutePosition,
with config: LookupConfig
) -> [LookupResult] {
return defaultLookupImplementation(
identifier,
at: position,
with: config,
propagateToParent: false
)
+ lookupThroughGenericParameterScope(
identifier,
at: lookUpPosition,
with: config
)
}
/// Passes lookup to this scope's generic parameter or
/// primary associated type clause scope (`WithGenericParametersScopeSyntax`).
///
/// ### Example
/// ```swift
/// let a = 23
/// func foo<A>(a: A) {
/// a // <-- start lookup here
/// }
/// ```
/// When starting lookup at the `a` reference,
/// lookup first visits the code block scope associated
/// with the function's body. Then, it's forwarded to the
/// function declaration scope and then to generic parameter
/// scope (`WithGenericParametersScopeSyntax`)
/// with this method (instead of using standard `lookupInParent`).
@_spi(Experimental) public func lookupThroughGenericParameterScope(
_ identifier: Identifier?,
at lookUpPosition: AbsolutePosition,
with config: LookupConfig
) -> [LookupResult] {
if let genericParameterClause {
return genericParameterClause.lookup(identifier, at: lookUpPosition, with: config)
} else {
return returningLookupFromGenericParameterScope(identifier, at: lookUpPosition, with: config)
}
}
@_spi(Experimental) public func returningLookupFromGenericParameterScope(
_ identifier: Identifier?,
at lookUpPosition: AbsolutePosition,
with config: LookupConfig
) -> [LookupResult] {
lookupInParent(identifier, at: lookUpPosition, with: config)
}
}
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