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SwiftSyntax: add pre and post visit function so that client can override a general visiting logic. SR-6902 #14365

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Merged
merged 2 commits into from
Feb 3, 2018
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SwiftSyntax: add pre and post visit function so that client can override a general visiting logic. SR-6902 #14365

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SwiftSyntax: add pre and post visit function so that client can overr…
nkcsgexi Feb 2, 2018
42be0d8
remove a wrong file.
nkcsgexi Feb 2, 2018
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21 changes: 21 additions & 0 deletions tools/SwiftSyntax/SyntaxRewriter.swift.gyb
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,18 @@ open class SyntaxRewriter {
open func visit(_ token: TokenSyntax) -> Syntax {
return token
}

/// The function called before visiting the node and its descendents.
/// - node: the node we are about to visit.
open func visitPre(_ node: Syntax) {}

/// The function called after visting the node and its descendents.
/// - node: the node we just finished visiting.
open func visitPost(_ node: Syntax) {}

public func visit(_ node: Syntax) -> Syntax {
visitPre(node)
defer { visitPost(node) }
switch node.raw.kind {
case .token: return visit(node as! TokenSyntax)
% for node in SYNTAX_NODES:
Expand Down Expand Up @@ -70,7 +81,17 @@ open class SyntaxVisitor {

open func visit(_ token: TokenSyntax) {}

/// The function called before visiting the node and its descendents.
/// - node: the node we are about to visit.
open func visitPre(_ node: Syntax) {}

/// The function called after visting the node and its descendents.
/// - node: the node we just finished visiting.
open func visitPost(_ node: Syntax) {}

public func visit(_ node: Syntax) {
visitPre(node)
defer { visitPost(node) }
switch node.raw.kind {
case .token: visit(node as! TokenSyntax)
% for node in SYNTAX_NODES:
Expand Down