ExprNodes.swift

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

public let EXPR_NODES: [Node] = [
  Node(
    kind: .arrayElementList,
    base: .syntaxCollection,
    nameForDiagnostics: nil,
    elementChoices: [.arrayElement]
  ),

  Node(
    kind: .arrayElement,
    base: .syntax,
    nameForDiagnostics: "array element",
    documentation: "An element inside an array literal.",
    traits: [
      "WithTrailingComma"
    ],
    children: [
      Child(
        name: "expression",
        kind: .node(kind: .expr),
        nameForDiagnostics: "value"
      ),
      Child(
        name: "trailingComma",
        kind: .token(choices: [.token(.comma)]),
        isOptional: true
      ),
    ]
  ),

  Node(
    kind: .arrayExpr,
    base: .expr,
    nameForDiagnostics: "array",
    documentation: "An array literal.",
    children: [
      Child(
        name: "leftSquare",
        kind: .token(choices: [.token(.leftSquare)])
      ),
      Child(
        name: "elements",
        kind: .collection(kind: .arrayElementList, collectionElementName: "Element")
      ),
      Child(
        name: "rightSquare",
        kind: .token(choices: [.token(.rightSquare)])
      ),
    ],
    childHistory: [
      [
        "leftSquare": .renamed(from: "leftSquareBracket"),
        "rightSquare": .renamed(from: "rightSquareBracket"),
      ]
    ]
  ),

  Node(
    kind: .arrowExpr,
    base: .expr,
    nameForDiagnostics: nil,
    documentation: """
      The arrow when a type is used at a position that syntactically expectes an expression.

      ### Examples

      This represents the arrow in

      ```swift
      let array = [(Int) -> Int]()
      ```
      """,
    children: [
      Child(
        name: "effectSpecifiers",
        kind: .node(kind: .typeEffectSpecifiers),
        isOptional: true
      ),
      Child(
        name: "arrow",
        kind: .token(choices: [.token(.arrow)])
      ),
    ],
    childHistory: [
      [
        "arrow": .renamed(from: "arrowToken")
      ]
    ]
  ),

  Node(
    kind: .asExpr,
    base: .expr,
    nameForDiagnostics: "'as'",
    documentation: """
      The cast of an expressison to a different type.

      ### Examples

      ```swift
      dog as Animal
      ``` 

      ```swift
      myPet as? Dog
      ```

      - Note: This node is only generated after operators are folded using the `SwiftOperators` library. 
        Beforehand, the parser does not know the precedences of operators and thus represents `is` by an ``UnresolvedAsExprSyntax``.
      """,
    children: [
      Child(
        name: "expression",
        kind: .node(kind: .expr)
      ),
      Child(
        name: "asKeyword",
        kind: .token(choices: [.keyword(.as)])
      ),
      Child(
        name: "questionOrExclamationMark",
        kind: .token(choices: [.token(.postfixQuestionMark), .token(.exclamationMark)]),
        isOptional: true
      ),
      Child(
        name: "type",
        kind: .node(kind: .type)
      ),
    ],
    childHistory: [
      [
        "asKeyword": .renamed(from: "asTok"),
        "type": .renamed(from: "typeName"),
      ]
    ]
  ),

  Node(
    kind: .assignmentExpr,
    base: .expr,
    nameForDiagnostics: nil,
    children: [
      Child(
        name: "equal",
        kind: .token(choices: [.token(.equal)])
      )
    ],
    childHistory: [
      [
        "equal": .renamed(from: "assignToken")
      ]
    ]
  ),

  Node(
    kind: .awaitExpr,
    base: .expr,
    nameForDiagnostics: "'await' expression",
    children: [
      Child(
        name: "awaitKeyword",
        kind: .token(choices: [.keyword(.await)])
      ),
      Child(
        name: "expression",
        kind: .node(kind: .expr)
      ),
    ]
  ),

  Node(
    kind: .binaryOperatorExpr,
    base: .expr,
    nameForDiagnostics: "operator",
    documentation: """
      An operator like `+` or `-`.

      This node represents the binary operator itself. It can occur inside a ``SequenceExprSyntax`` 
      after parsing and will be the `operator` child of an ``InfixOperatorExprSyntax`` 
      after folding operator using the `SwiftOperators` library.
      """,
    children: [
      Child(
        name: "operator",
        kind: .token(choices: [.token(.binaryOperator)])
      )
    ],
    childHistory: [
      [
        "operator": .renamed(from: "operatorToken")
      ]
    ]
  ),

  Node(
    kind: .booleanLiteralExpr,
    base: .expr,
    nameForDiagnostics: "bool literal",
    children: [
      Child(
        name: "literal",
        kind: .token(choices: [.keyword(.true), .keyword(.false)])
      )
    ],
    childHistory: [
      [
        "literal": .renamed(from: "booleanLiteral")
      ]
    ]
  ),

  Node(
    kind: .borrowExpr,
    base: .expr,
    nameForDiagnostics: "'_borrow' expression",
    children: [
      Child(
        name: "borrowKeyword",
        kind: .token(choices: [.keyword(._borrow), .keyword(.borrow)])
      ),
      Child(
        name: "expression",
        kind: .node(kind: .expr)
      ),
    ]
  ),

  Node(
    kind: ._canImportExpr,
    base: .expr,
    nameForDiagnostics: "'canImport' expression",
    children: [
      Child(
        name: "canImportKeyword",
        kind: .token(choices: [.keyword(.canImport)])
      ),
      Child(
        name: "leftParen",
        kind: .token(choices: [.token(.leftParen)])
      ),
      Child(
        name: "importPath",
        kind: .token(choices: [.token(.identifier)])
      ),
      Child(
        name: "versionInfo",
        kind: .node(kind: ._canImportVersionInfo),
        isOptional: true
      ),
      Child(
        name: "rightParen",
        kind: .token(choices: [.token(.rightParen)])
      ),
    ]
  ),

  Node(
    kind: ._canImportVersionInfo,
    base: .expr,
    nameForDiagnostics: nil,
    children: [
      Child(
        name: "comma",
        kind: .token(choices: [.token(.comma)])
      ),
      Child(
        name: "label",
        kind: .token(choices: [.keyword(._version), .keyword(._underlyingVersion)])
      ),
      Child(
        name: "colon",
        kind: .token(choices: [.token(.colon)])
      ),
      Child(
        name: "version",
        kind: .node(kind: .versionTuple)
      ),
    ],
    childHistory: [
      [
        "version": .renamed(from: "versionTuple")
      ]
    ]
  ),

  Node(
    kind: .switchCaseItem,
    base: .syntax,
    nameForDiagnostics: nil,
    traits: [
      "WithTrailingComma"
    ],
    children: [
      Child(
        name: "pattern",
        kind: .node(kind: .pattern)
      ),
      Child(
        name: "whereClause",
        kind: .node(kind: .whereClause),
        isOptional: true
      ),
      Child(
        name: "trailingComma",
        kind: .token(choices: [.token(.comma)]),
        isOptional: true
      ),
    ]
  ),

  Node(
    kind: .closureCaptureList,
    base: .syntaxCollection,
    nameForDiagnostics: nil,
    elementChoices: [.closureCapture]
  ),

  Node(
    kind: .closureCaptureSpecifier,
    base: .syntax,
    nameForDiagnostics: "closure capture specifier",
    children: [
      Child(
        name: "specifier",
        kind: .token(choices: [.keyword(.weak), .keyword(.unowned)])
      ),
      Child(
        name: "leftParen",
        kind: .token(choices: [.token(.leftParen)]),
        isOptional: true
      ),
      Child(
        name: "detail",
        kind: .token(choices: [.keyword(.safe), .keyword(.unsafe)]),
        isOptional: true
      ),
      Child(
        name: "rightParen",
        kind: .token(choices: [.token(.rightParen)]),
        isOptional: true
      ),
    ]
  ),

  Node(
    kind: .closureCapture,
    base: .syntax,
    nameForDiagnostics: "closure capture",
    traits: [
      "WithTrailingComma"
    ],
    children: [
      Child(
        name: "specifier",
        kind: .node(kind: .closureCaptureSpecifier),
        isOptional: true
      ),
      Child(
        name: "name",
        kind: .token(choices: [.token(.identifier), .keyword(.self)])
      ),
      Child(
        name: "initializer",
        kind: .node(kind: .initializerClause),
        isOptional: true
      ),
      Child(
        name: "trailingComma",
        kind: .token(choices: [.token(.comma)]),
        isOptional: true
      ),
    ]
  ),

  Node(
    kind: .closureCaptureClause,
    base: .syntax,
    nameForDiagnostics: "closure capture clause",
    children: [
      Child(
        name: "leftSquare",
        kind: .token(choices: [.token(.leftSquare)])
      ),
      Child(
        name: "items",
        kind: .collection(kind: .closureCaptureList, collectionElementName: "Item")
      ),
      Child(
        name: "rightSquare",
        kind: .token(choices: [.token(.rightSquare)])
      ),
    ]
  ),

  Node(
    kind: .closureParameter,
    base: .syntax,
    nameForDiagnostics: "parameter",
    parserFunction: "parseClosureParameter",
    traits: ["WithTrailingComma", "WithAttributes", "WithModifiers"],
    children: [
      Child(
        name: "attributes",
        kind: .collection(kind: .attributeList, collectionElementName: "Attribute", defaultsToEmpty: true),
        nameForDiagnostics: "attributes"
      ),
      Child(
        name: "modifiers",
        kind: .collection(kind: .declModifierList, collectionElementName: "Modifier", defaultsToEmpty: true),
        nameForDiagnostics: "modifiers"
      ),
      Child(
        name: "firstName",
        kind: .token(choices: [.token(.identifier), .token(.wildcard)]),
        documentation: "The label of this parameter that will be used when the closure is called."
      ),
      Child(
        name: "secondName",
        kind: .token(choices: [.token(.identifier), .token(.wildcard)]),
        documentation:
          "If this is specified, it is the name by which the parameter can be referenced inside the closure body. If it is `nil`, the closure parameter is referenced by the first name.",
        isOptional: true
      ),
      Child(
        name: "colon",
        kind: .token(choices: [.token(.colon)]),
        documentation: "The colon separating the parameter's name and type.",
        isOptional: true
      ),
      Child(
        name: "type",
        kind: .node(kind: .type),
        nameForDiagnostics: "type",
        documentation: "The type of the parameter.",
        isOptional: true
      ),
      Child(
        name: "ellipsis",
        kind: .token(choices: [.token(.ellipsis)]),
        documentation: "If the parameter is variadic, `...` to indicate that.",
        isOptional: true
      ),
      Child(
        name: "trailingComma",
        kind: .token(choices: [.token(.comma)]),
        documentation: "If the parameter is followed by another parameter, the comma separating them.",
        isOptional: true
      ),
    ]
  ),

  Node(
    kind: .closureParameterList,
    base: .syntaxCollection,
    nameForDiagnostics: "parameter list",
    elementChoices: [.closureParameter]
  ),

  Node(
    kind: .closureParameterClause,
    base: .syntax,
    nameForDiagnostics: "parameter clause",
    traits: [
      "Parenthesized"
    ],
    children: [
      Child(
        name: "leftParen",
        kind: .token(choices: [.token(.leftParen)]),
        documentation: "The '(' to open the parameter clause."
      ),
      Child(
        name: "parameters",
        kind: .collection(kind: .closureParameterList, collectionElementName: "Parameter"),
        nameForDiagnostics: "parameters",
        documentation: "The actual parameters."
      ),
      Child(
        name: "rightParen",
        kind: .token(choices: [.token(.rightParen)]),
        documentation: "The ')' to close the parameter clause."
      ),
    ],
    childHistory: [
      [
        "parameters": .renamed(from: "parameterList")
      ]
    ]
  ),

  Node(
    kind: .closureExpr,
    base: .expr,
    nameForDiagnostics: "closure",
    traits: [
      "Braced",
      "WithStatements",
    ],
    children: [
      Child(
        name: "leftBrace",
        kind: .token(choices: [
          .token(.leftBrace),
          .token(.leadingBoxCorner),
          .token(.leadingBoxJunction),
        ], defaultAt: 0)
      ),
      Child(
        name: "signature",
        kind: .node(kind: .closureSignature),
        isOptional: true
      ),
      Child(
        name: "statements",
        kind: .collection(kind: .codeBlockItemList, collectionElementName: "Statement")
      ),
      Child(
        name: "rightBrace",
        kind: .token(choices: [
          .token(.rightBrace),
          .token(.trailingBoxCorner),
          .token(.trailingBoxJunction),
        ], defaultAt: 0)
      ),
    ]
  ),

  Node(
    kind: .closureShorthandParameterList,
    base: .syntaxCollection,
    nameForDiagnostics: nil,
    documentation: """
      A list of closure parameters that are not parenthesized and don't have type annotations.

      If the closure parameters are parenthesized, they can also carry type annotations. 
      In that case, the closure parameters are represented by ``ClosureParameterListSyntax``.

      ### Examples

      ```
      let closure = { a, b in
        return a + b
      }
      ```
      """,
    elementChoices: [.closureShorthandParameter]
  ),

  Node(
    kind: .closureShorthandParameter,
    base: .syntax,
    nameForDiagnostics: "closure parameter",
    traits: [
      "WithTrailingComma"
    ],
    children: [
      Child(
        name: "name",
        kind: .token(choices: [.token(.identifier), .token(.wildcard)]),
        nameForDiagnostics: "name"
      ),
      Child(
        name: "trailingComma",
        kind: .token(choices: [.token(.comma)]),
        isOptional: true
      ),
    ]
  ),

  Node(
    kind: .closureSignature,
    base: .syntax,
    nameForDiagnostics: "closure signature",
    traits: [
      "WithAttributes"
    ],
    children: [
      Child(
        name: "attributes",
        kind: .collection(kind: .attributeList, collectionElementName: "Attribute", defaultsToEmpty: true),
        nameForDiagnostics: "attributes"
      ),
      Child(
        name: "capture",
        kind: .node(kind: .closureCaptureClause),
        isOptional: true
      ),
      Child(
        name: "parameterClause",
        kind: .nodeChoices(
          choices: [
            Child(
              name: "simpleInput",
              kind: .node(kind: .closureShorthandParameterList)
            ),
            Child(
              name: "parameterClause",
              kind: .node(kind: .closureParameterClause)
            ),
          ],
          childHistory: [
            [
              "parameterClause": .renamed(from: "input")
            ]
          ]
        ),
        isOptional: true
      ),
      Child(
        name: "effectSpecifiers",
        kind: .node(kind: .typeEffectSpecifiers),
        isOptional: true
      ),
      Child(
        name: "returnClause",
        kind: .node(kind: .returnClause),
        isOptional: true
      ),
      Child(
        name: "inKeyword",
        kind: .token(choices: [.keyword(.in)])
      ),
    ],
    childHistory: [
      [
        "parameterClause": .renamed(from: "input"),
        "returnClause": .renamed(from: "output"),
        "inKeyword": .renamed(from: "inTok"),
      ]
    ]
  ),

  Node(
    kind: .declNameArgumentList,
    base: .syntaxCollection,
    nameForDiagnostics: nil,
    elementChoices: [.declNameArgument]
  ),

  Node(
    kind: .declNameArgument,
    base: .syntax,
    nameForDiagnostics: nil,
    children: [
      Child(
        name: "name",
        kind: .node(kind: .token)
      ),
      Child(
        name: "colon",
        kind: .token(choices: [.token(.colon)], requiresTrailingSpace: false)
      ),
    ]
  ),

  Node(
    kind: .declNameArguments,
    base: .syntax,
    nameForDiagnostics: nil,
    traits: [
      "Parenthesized"
    ],
    children: [
      Child(
        name: "leftParen",
        kind: .token(choices: [.token(.leftParen)])
      ),
      Child(
        name: "arguments",
        kind: .collection(kind: .declNameArgumentList, collectionElementName: "Argument")
      ),
      Child(
        name: "rightParen",
        kind: .token(choices: [.token(.rightParen)])
      ),
    ]
  ),

  Node(
    kind: .dictionaryElementList,
    base: .syntaxCollection,
    nameForDiagnostics: nil,
    elementChoices: [.dictionaryElement]
  ),

  Node(
    kind: .dictionaryElement,
    base: .syntax,
    nameForDiagnostics: "dictionary element",
    documentation: "An element inside a dictionary literal.",
    traits: [
      "WithTrailingComma"
    ],
    children: [
      Child(
        name: "key",
        kind: .node(kind: .expr),
        nameForDiagnostics: "key"
      ),
      Child(
        name: "colon",
        kind: .token(choices: [.token(.colon)])
      ),
      Child(
        name: "value",
        kind: .node(kind: .expr),
        nameForDiagnostics: "value"
      ),
      Child(
        name: "trailingComma",
        kind: .token(choices: [.token(.comma)]),
        isOptional: true
      ),
    ],
    childHistory: [
      [
        "key": .renamed(from: "keyExpression"),
        "value": .renamed(from: "valueExpression"),
      ]
    ]
  ),

  Node(
    kind: .dictionaryExpr,
    base: .expr,
    nameForDiagnostics: "dictionary",
    documentation: "A dictionary literal",
    children: [
      Child(
        name: "leftSquare",
        kind: .token(choices: [.token(.leftSquare)])
      ),
      Child(
        name: "content",
        kind: .nodeChoices(choices: [
          Child(
            name: "colon",
            kind: .token(choices: [.token(.colon)], requiresTrailingSpace: false)
          ),
          Child(
            name: "elements",
            kind: .node(kind: .dictionaryElementList)
          ),
        ])
      ),
      Child(
        name: "rightSquare",
        kind: .token(choices: [.token(.rightSquare)])
      ),
    ]
  ),

  Node(
    kind: .discardAssignmentExpr,
    base: .expr,
    nameForDiagnostics: nil,
    documentation: """
      A `_` that discards a value inside an assignment.

      ### Examples

      ```swift
      _ = 42
      ``` 


      ```swift
      if case .foo(_) = myValue
      ```
      """,
    children: [
      Child(
        name: "wildcard",
        kind: .token(choices: [.token(.wildcard)])
      )
    ]
  ),

  Node(
    kind: .doExpr,
    base: .expr,
    experimentalFeature: .doExpressions,
    nameForDiagnostics: "'do' block",
    documentation: """
      A `do` block with one of more optional `catch` clauses.

      This represents do blocks in both expression and statement postitions
      (where the latter are wrapped in ExpressionStmtSyntax).

      ### Examples

      ```swift
      do {
        let x = 0
        print(x)
      }
      ```

      ```swift
      let x = do {
        try someThrowingFn()
      } catch {
        defaultValue
      }
      ```
      """,
    traits: [
      "WithCodeBlock"
    ],
    children: [
      Child(
        name: "doKeyword",
        kind: .token(choices: [.keyword(.do)])
      ),
      Child(
        name: "body",
        kind: .node(kind: .codeBlock),
        nameForDiagnostics: "body"
      ),
      Child(
        name: "catchClauses",
        kind: .collection(kind: .catchClauseList, collectionElementName: "CatchClause", defaultsToEmpty: true)
      ),
    ]
  ),

  Node(
    kind: .editorPlaceholderExpr,
    base: .expr,
    nameForDiagnostics: "editor placeholder",
    documentation: """
      - Warning: This ``EditorPlaceholderExprSyntax`` node is not generated by the parser anymore. Placeholders are represented by a ``DeclReferenceExprSyntax``.
      """,
    children: [
      Child(
        name: "placeholder",
        kind: .token(choices: [.token(.identifier)])
      )
    ],
    childHistory: [
      [
        "placeholder": .renamed(from: "identifier")
      ]
    ]
  ),

  Node(
    kind: .exprList,
    base: .syntaxCollection,
    nameForDiagnostics: nil,
    documentation: "A list of expressions connected by operators. This list is contained by a ``SequenceExprSyntax``.",
    elementChoices: [.expr]
  ),

  Node(
    kind: .expressionSegment,
    base: .syntax,
    nameForDiagnostics: nil,
    documentation: """
      An interpolated expression inside a string literal.

      - SeeAlso: ``StringSegmentSyntax``
      """,
    traits: [
      "Parenthesized"
    ],
    children: [
      Child(
        name: "backslash",
        kind: .token(choices: [.token(.backslash)])
      ),
      Child(
        name: "pounds",
        kind: .token(choices: [.token(.rawStringPoundDelimiter)]),
        isOptional: true
      ),
      Child(
        name: "leftParen",
        kind: .token(choices: [.token(.leftParen)])
      ),
      Child(
        name: "expressions",
        kind: .collection(kind: .labeledExprList, collectionElementName: "Expression")
      ),
      Child(
        name: "rightParen",
        kind: .token(choices: [.token(.rightParen)])
      ),
    ],
    childHistory: [
      [
        "pounds": .renamed(from: "delimiter")
      ]
    ]
  ),

  Node(
    kind: .floatLiteralExpr,
    base: .expr,
    nameForDiagnostics: "floating literal",
    children: [
      Child(
        name: "literal",
        kind: .token(choices: [.token(.floatLiteral)])
      )
    ],
    childHistory: [
      [
        "literal": .renamed(from: "floatingDigits")
      ]
    ]
  ),

  Node(
    kind: .forceUnwrapExpr,
    base: .expr,
    nameForDiagnostics: "force unwrap",
    children: [
      Child(
        name: "expression",
        kind: .node(kind: .expr)
      ),
      Child(
        name: "exclamationMark",
        kind: .token(choices: [.token(.exclamationMark)])
      ),
    ]
  ),

  Node(
    kind: .functionCallExpr,
    base: .expr,
    nameForDiagnostics: "function call",
    children: [
      Child(
        name: "calledExpression",
        kind: .node(kind: .expr),
        nameForDiagnostics: "called expression"
      ),
      Child(
        name: "leftParen",
        kind: .token(choices: [.token(.leftParen)]),
        isOptional: true
      ),
      Child(
        name: "arguments",
        kind: .collection(kind: .labeledExprList, collectionElementName: "Argument"),
        nameForDiagnostics: "arguments"
      ),
      Child(
        name: "rightParen",
        kind: .token(choices: [.token(.rightParen)]),
        isOptional: true
      ),
      Child(
        name: "trailingClosure",
        kind: .node(kind: .closureExpr),
        nameForDiagnostics: "trailing closure",
        isOptional: true
      ),
      Child(
        name: "additionalTrailingClosures",
        kind: .collection(
          kind: .multipleTrailingClosureElementList,
          collectionElementName: "AdditionalTrailingClosure",
          defaultsToEmpty: true
        ),
        nameForDiagnostics: "trailing closures"
      ),
    ],
    childHistory: [
      [
        "arguments": .renamed(from: "argumentList")
      ]
    ]
  ),

  Node(
    kind: .declReferenceExpr,
    base: .expr,
    nameForDiagnostics: nil,
    children: [
      Child(
        name: "baseName",
        kind: .token(choices: [
          .token(.identifier),
          .keyword(.self),
          .keyword(.Self),
          .keyword(.`init`),
          .keyword(.`deinit`),
          .keyword(.`subscript`),
          .token(.dollarIdentifier),
          .token(.binaryOperator),
          .token(.integerLiteral),
        ])
      ),
      Child(
        name: "argumentNames",
        kind: .node(kind: .declNameArguments),
        isOptional: true
      ),
    ],
    childHistory: [
      [
        "baseName": .renamed(from: "identifier"),
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