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| 1 | +//===----------------------------------------------------------------------===// |
| 2 | +// |
| 3 | +// This source file is part of the Swift.org open source project |
| 4 | +// |
| 5 | +// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors |
| 6 | +// Licensed under Apache License v2.0 with Runtime Library Exception |
| 7 | +// |
| 8 | +// See https://swift.org/LICENSE.txt for license information |
| 9 | +// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| 10 | +// |
| 11 | +//===----------------------------------------------------------------------===// |
| 12 | + |
| 13 | +@_spi(RawSyntax) import SwiftSyntax |
| 14 | + |
| 15 | +fileprivate extension SyntaxCollection { |
| 16 | + static func parse( |
| 17 | + from parser: inout Parser, |
| 18 | + parse: (_ parser: inout Parser) -> some RawSyntaxNodeProtocol, |
| 19 | + makeMissing: (_ remainingTokens: [RawSyntax], _ arena: SyntaxArena) -> some RawSyntaxNodeProtocol |
| 20 | + ) -> Self { |
| 21 | + // Keep the parser alive so that the arena in which `raw` is allocated |
| 22 | + // doesn’t get deallocated before we have a chance to create a syntax node |
| 23 | + // from it. We can’t use `parser.arena` as the parameter to |
| 24 | + // `Syntax(raw:arena:)` because the node might have been re-used during an |
| 25 | + // incremental parse and would then live in a different arena than |
| 26 | + // `parser.arena`. |
| 27 | + defer { |
| 28 | + withExtendedLifetime(parser) { |
| 29 | + } |
| 30 | + } |
| 31 | + let node = parse(&parser) |
| 32 | + |
| 33 | + if parser.at(.endOfFile) { |
| 34 | + return Syntax(raw: node.raw, rawNodeArena: parser.arena).cast(Self.self) |
| 35 | + } |
| 36 | + |
| 37 | + let layoutView = node.raw.layoutView! |
| 38 | + |
| 39 | + if layoutView.children.isEmpty { |
| 40 | + let remainingTokens = parser.consumeRemainingTokens() |
| 41 | + assert(!remainingTokens.isEmpty) |
| 42 | + let missing = makeMissing(remainingTokens, parser.arena) |
| 43 | + let raw = layoutView.insertingChild(missing.raw, at: node.raw.layoutView!.children.count, arena: parser.arena) |
| 44 | + return Syntax(raw: raw, rawNodeArena: parser.arena).cast(Self.self) |
| 45 | + } else { |
| 46 | + // First unwrap: We know that children.last exists because children is not empty |
| 47 | + // Second unwrap: This is a collection and collections never have optional children. Thus the last child can’t be nil. |
| 48 | + let lastWithRemainder = parser.parseRemainder(into: layoutView.children.last!!) |
| 49 | + let raw = layoutView.replacingChild(at: layoutView.children.count - 1, with: lastWithRemainder, arena: parser.arena) |
| 50 | + return Syntax(raw: raw, rawNodeArena: parser.arena).cast(Self.self) |
| 51 | + } |
| 52 | + } |
| 53 | +} |
| 54 | + |
| 55 | +extension AccessorDeclListSyntax: SyntaxParseable { |
| 56 | + public static func parse(from parser: inout Parser) -> Self { |
| 57 | + return parse(from: &parser) { parser in |
| 58 | + return parser.parseAccessorList() ?? RawAccessorDeclListSyntax(elements: [], arena: parser.arena) |
| 59 | + } makeMissing: { remainingTokens, arena in |
| 60 | + return RawAccessorDeclSyntax( |
| 61 | + attributes: nil, |
| 62 | + modifier: nil, |
| 63 | + accessorSpecifier: RawTokenSyntax(missing: .keyword, text: "get", arena: arena), |
| 64 | + parameters: nil, |
| 65 | + effectSpecifiers: nil, |
| 66 | + initEffects: nil, |
| 67 | + body: nil, |
| 68 | + arena: arena |
| 69 | + ) |
| 70 | + } |
| 71 | + } |
| 72 | +} |
| 73 | + |
| 74 | +extension AttributeListSyntax: SyntaxParseable { |
| 75 | + public static func parse(from parser: inout Parser) -> Self { |
| 76 | + return parse(from: &parser) { parser in |
| 77 | + let node = parser.parseAttributeList() ?? RawAttributeListSyntax(elements: [], arena: parser.arena) |
| 78 | + return RawSyntax(node) |
| 79 | + } makeMissing: { remainingTokens, arena in |
| 80 | + return RawAttributeSyntax( |
| 81 | + atSign: RawTokenSyntax(missing: .atSign, arena: arena), |
| 82 | + attributeName: RawTypeSyntax(RawMissingTypeSyntax(arena: arena)), |
| 83 | + leftParen: nil, |
| 84 | + arguments: nil, |
| 85 | + rightParen: nil, |
| 86 | + arena: arena |
| 87 | + ) |
| 88 | + } |
| 89 | + } |
| 90 | +} |
| 91 | + |
| 92 | +extension CodeBlockItemListSyntax: SyntaxParseable { |
| 93 | + public static func parse(from parser: inout Parser) -> Self { |
| 94 | + return parse(from: &parser) { parser in |
| 95 | + let node = parser.parseCodeBlockItemList(until: { _ in false }) |
| 96 | + return RawSyntax(node) |
| 97 | + } makeMissing: { remainingTokens, arena in |
| 98 | + let missingExpr = RawMissingExprSyntax(arena: arena) |
| 99 | + return RawCodeBlockItemSyntax(item: .expr(RawExprSyntax(missingExpr)), semicolon: nil, arena: arena) |
| 100 | + } |
| 101 | + } |
| 102 | +} |
| 103 | + |
| 104 | +extension MemberBlockItemListSyntax: SyntaxParseable { |
| 105 | + public static func parse(from parser: inout Parser) -> Self { |
| 106 | + return parse(from: &parser) { parser in |
| 107 | + return RawSyntax(parser.parseMemberDeclList()) |
| 108 | + } makeMissing: { remainingTokens, arena in |
| 109 | + let missingDecl = RawMissingDeclSyntax( |
| 110 | + attributes: nil, |
| 111 | + modifiers: nil, |
| 112 | + placeholder: RawTokenSyntax(missing: .identifier, text: "<#declaration#>", arena: arena), |
| 113 | + RawUnexpectedNodesSyntax(remainingTokens, arena: arena), |
| 114 | + arena: arena |
| 115 | + ) |
| 116 | + return RawMemberBlockItemSyntax(decl: RawDeclSyntax(missingDecl), semicolon: nil, arena: arena) |
| 117 | + } |
| 118 | + } |
| 119 | +} |
| 120 | + |
| 121 | +//==========================================================================// |
| 122 | +// IMPORTANT: When adding a new conformance, also add a corrsponding // |
| 123 | +// conformance to SyntaxExpressibleByStringInterpolation. // |
| 124 | +//==========================================================================// |
| 125 | + |
| 126 | +//==========================================================================// |
| 127 | +// IMPORTANT: If you are tempted to add a new conformances here please // |
| 128 | +// insert in in alphabetical order above // |
| 129 | +//==========================================================================// |
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