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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 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 SwiftBasicFormat
import SwiftSyntax
/// A format style for files generated by CodeGeneration.
public class CodeGenerationFormat: BasicFormat {
/// The maximum number of array/dictionary/function parameters/tuple elements
/// that should be put on the same line.
private let maxElementsOnSameLine: Int
public init(maxElementsOnSameLine: Int = 3) {
self.maxElementsOnSameLine = maxElementsOnSameLine
super.init(indentationWidth: .spaces(2))
}
var indentedNewline: Trivia {
.newline + currentIndentationLevel
}
public override func visit(_ node: ArrayElementListSyntax) -> ArrayElementListSyntax {
let children = node.children(viewMode: .all)
// Short array literals are presented on one line, list each element on a different line.
if children.count > maxElementsOnSameLine {
return ArrayElementListSyntax(
formatChildrenSeparatedByNewline(children: children, elementType: ArrayElementSyntax.self)
)
} else {
return super.visit(node)
}
}
public override func visit(_ node: CodeBlockItemSyntax) -> CodeBlockItemSyntax {
if node.parent?.parent?.is(SourceFileSyntax.self) == true, !shouldBeSeparatedByTwoNewlines(node: node) {
let formatted = super.visit(node)
return ensuringTwoLeadingNewlines(node: formatted)
} else {
return super.visit(node)
}
}
public override func visit(_ node: DictionaryElementListSyntax) -> DictionaryElementListSyntax {
let children = node.children(viewMode: .all)
// Short dictionary literals are presented on one line, list each element on a different line.
if children.count > maxElementsOnSameLine {
return DictionaryElementListSyntax(
formatChildrenSeparatedByNewline(children: children, elementType: DictionaryElementSyntax.self)
)
} else {
return super.visit(node)
}
}
public override func visit(_ node: FunctionParameterListSyntax) -> FunctionParameterListSyntax {
let children = node.children(viewMode: .all)
// Short function parameter literals are presented on one line, list each element on a different line.
if children.count > maxElementsOnSameLine {
return FunctionParameterListSyntax(
formatChildrenSeparatedByNewline(children: children, elementType: FunctionParameterSyntax.self)
)
} else {
return super.visit(node)
}
}
public override func visit(_ node: MemberBlockSyntax) -> MemberBlockSyntax {
if node.members.count == 0 {
return node.with(\.leftBrace, .leftBraceToken())
} else {
return super.visit(node)
}
}
public override func visit(_ node: MemberBlockItemSyntax) -> MemberBlockItemSyntax {
let formatted = super.visit(node)
if node != node.parent?.children(viewMode: .sourceAccurate).first?.as(MemberBlockItemSyntax.self)
&& !node.decl.is(EnumCaseDeclSyntax.self)
{
return ensuringTwoLeadingNewlines(node: formatted)
} else {
return formatted
}
}
public override func visit(_ node: LabeledExprListSyntax) -> LabeledExprListSyntax {
let children = node.children(viewMode: .all)
// Short tuple element list literals are presented on one line, list each element on a different line.
if children.count > maxElementsOnSameLine {
return LabeledExprListSyntax(
formatChildrenSeparatedByNewline(children: children, elementType: LabeledExprSyntax.self)
)
} else {
return super.visit(node)
}
}
// MARK: - Private
private func shouldBeSeparatedByTwoNewlines(node: CodeBlockItemSyntax) -> Bool {
// First item in the ``CodeBlockItemListSyntax`` don't need a newline or indentation if the parent is a ``SourceFileSyntax``.
// We want to group imports so newline between them should be omitted
return node.parent?.as(CodeBlockItemListSyntax.self)?.first == node || node.item.is(ImportDeclSyntax.self)
}
private func ensuringTwoLeadingNewlines<NodeType: SyntaxProtocol>(node: NodeType) -> NodeType {
if node.leadingTrivia.first?.isNewline ?? false {
return node.with(\.leadingTrivia, indentedNewline + node.leadingTrivia)
} else {
return node.with(\.leadingTrivia, indentedNewline + indentedNewline + node.leadingTrivia)
}
}
private func formatChildrenSeparatedByNewline<SyntaxType: SyntaxProtocol>(
children: SyntaxChildren,
elementType: SyntaxType.Type
) -> [SyntaxType] {
increaseIndentationLevel()
var formattedChildren = children.map {
self.rewrite($0.cast(SyntaxType.self)).cast(SyntaxType.self)
}
formattedChildren = formattedChildren.map {
if $0.leadingTrivia.first?.isNewline == true {
return $0
} else {
return $0.with(\.leadingTrivia, indentedNewline + $0.leadingTrivia)
}
}
decreaseIndentationLevel()
if !formattedChildren.isEmpty {
formattedChildren[formattedChildren.count - 1] = formattedChildren[formattedChildren.count - 1].with(
\.trailingTrivia,
indentedNewline
)
}
return formattedChildren
}
}
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