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Allow indentation width to be set explicitly (#8)
This allows the user to circumvent the default indentation behavior. In particular, it can be used to avoid getting the default four-space indentation when expanding source that doesn’t contain any indentation to infer the indentation width from. Changes: * The `assertMacro` function, along with related functions, now accepts `indentationWidth` as a parameter (`Trivia`). * Introduces `IndentationWidthTests` to validate both the existing indentation behavior and the new explicit indentation width functionality.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| import MacroTesting | ||
| import SwiftSyntax | ||
| import SwiftSyntaxMacros | ||
| import XCTest | ||
|
|
||
| private struct AddMemberMacro: MemberMacro { | ||
| static func expansion( | ||
| of node: AttributeSyntax, | ||
| providingMembersOf declaration: some DeclGroupSyntax, | ||
| in context: some MacroExpansionContext | ||
| ) throws -> [DeclSyntax] { | ||
| return ["let v: T"] | ||
| } | ||
| } | ||
|
|
||
| final class IndentationWidthTests: XCTestCase { | ||
| func testExpansionAddsMemberUsingDetectedIndentation() { | ||
| assertMacro([AddMemberMacro.self]) { | ||
| """ | ||
| @AddMember | ||
| struct S { | ||
| let w: T | ||
| } | ||
| """ | ||
| } expansion: { | ||
| """ | ||
| struct S { | ||
| let w: T | ||
| let v: T | ||
| } | ||
| """ | ||
| } | ||
| } | ||
|
|
||
| func testExpansionAddsMemberToEmptyStructUsingDefaultIndentation() { | ||
| assertMacro([AddMemberMacro.self]) { | ||
| """ | ||
| @AddMember | ||
| struct S { | ||
| } | ||
| """ | ||
| } expansion: { | ||
| """ | ||
| struct S { | ||
| let v: T | ||
| } | ||
| """ | ||
| } | ||
| } | ||
|
|
||
| func testExpansionAddsMemberToEmptyStructUsingTwoSpaceIndentation() { | ||
| assertMacro( | ||
| [AddMemberMacro.self], | ||
| indentationWidth: .spaces(2) | ||
| ) { | ||
| """ | ||
| @AddMember | ||
| struct S { | ||
| } | ||
| """ | ||
| } expansion: { | ||
| """ | ||
| struct S { | ||
| let v: T | ||
| } | ||
| """ | ||
| } | ||
| } | ||
|
|
||
| func testExpansionAddsMemberToEmptyStructUsingTwoSpaceIndentation_withMacroTesting() { | ||
| withMacroTesting( | ||
| indentationWidth: .spaces(2), | ||
| macros: [AddMemberMacro.self] | ||
| ) { | ||
| assertMacro { | ||
| """ | ||
| @AddMember | ||
| struct S { | ||
| } | ||
| """ | ||
| } expansion: { | ||
| """ | ||
| struct S { | ||
| let v: T | ||
| } | ||
| """ | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func testExpansionAddsMemberUsingMistchedIndentation() { | ||
| assertMacro( | ||
| [AddMemberMacro.self], | ||
| indentationWidth: .spaces(4) | ||
| ) { | ||
| """ | ||
| @AddMember | ||
| struct S { | ||
| let w: T | ||
| } | ||
| """ | ||
| } expansion: { | ||
| """ | ||
| struct S { | ||
| let w: T | ||
| let v: T | ||
| } | ||
| """ | ||
| } | ||
| } | ||
| } |