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092edd6621
VarPattern is today used to implement both 'let' and 'var' pattern bindings, so today is already misleading. The reason why the name Var was chosen was done b/c it is meant to represent a pattern that performs 'variable binding'. Given that I am going to add a new 'inout' pattern binding to this, it makes sense to give it now a better fitting name before I make things more confusing.
53 lines
2.0 KiB
C++
53 lines
2.0 KiB
C++
//===--- PatternNodes.def - Swift Pattern AST Metaprogramming ---*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines macros used for macro-metaprogramming with patterns.
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//
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//===----------------------------------------------------------------------===//
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/// PATTERN(Id, Parent)
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/// The pattern's enumerator value is PatternKind::Id. The pattern's
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/// class name is Id##Pattern, and the name of its base class is Parent.
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#ifndef PATTERN
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# error Included PatternNodes.def without defining PATTERN!
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#endif
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/// REFUTABLE_PATTERN(Id, Parent)
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/// Matching this pattern can fail. These patterns cannot appear syntactically
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/// in variable declarations, assignments, or function declarations.
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#ifndef REFUTABLE_PATTERN
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# define REFUTABLE_PATTERN(Id, Parent) PATTERN(Id, Parent)
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#endif
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#ifndef LAST_PATTERN
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#define LAST_PATTERN(Id)
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#endif
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// Metavars: x (variable binding), pat (pattern), e (expression)
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PATTERN(Paren, Pattern) // (pat)
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PATTERN(Tuple, Pattern) // (pat1, ..., patN), N >= 1
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PATTERN(Named, Pattern) // let pat, var pat
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PATTERN(Any, Pattern) // _
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PATTERN(Typed, Pattern) // pat : type
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PATTERN(Binding, Pattern) // x
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REFUTABLE_PATTERN(Is, Pattern) // x is myclass
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REFUTABLE_PATTERN(EnumElement, Pattern) // .mycase(pat1, ..., patN)
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// MyType.mycase(pat1, ..., patN)
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REFUTABLE_PATTERN(OptionalSome, Pattern) // pat? nil
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REFUTABLE_PATTERN(Bool, Pattern) // true, false
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REFUTABLE_PATTERN(Expr, Pattern) // e
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LAST_PATTERN(Expr)
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#undef REFUTABLE_PATTERN
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#undef PATTERN
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#undef LAST_PATTERN
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