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Based on the feedbacks from our early adopters, separating syntax tree analysis with transformation is a common pattern. Thus, we introduce a read-only syntax tree visitor to help the analysis phase. This visitor never alters the content of a tree being visited, in contrast to SyntaxRewriter which always does.
38 lines
911 B
Swift
38 lines
911 B
Swift
// RUN: %target-run-simple-swift
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// REQUIRES: executable_test
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// REQUIRES: OS=macosx
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// REQUIRES: objc_interop
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import StdlibUnittest
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import Foundation
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import SwiftSyntax
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func getInput(_ file: String) -> URL {
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var result = URL(fileURLWithPath: #file)
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result.deleteLastPathComponent()
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result.appendPathComponent("Inputs")
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result.appendPathComponent(file)
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return result
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}
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var VisitorTests = TestSuite("SyntaxVisitor")
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VisitorTests.test("Basic") {
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class FuncCounter: SyntaxVisitor {
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var funcCount = 0
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override func visit(_ node: FunctionDeclSyntax) {
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funcCount += 1
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super.visit(node)
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}
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}
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expectDoesNotThrow({
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let parsed = try Syntax.parse(getInput("visitor.swift"))
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let counter = FuncCounter()
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let hashBefore = parsed.hashValue
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counter.visit(parsed)
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expectEqual(counter.funcCount, 3)
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expectEqual(hashBefore, parsed.hashValue)
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})
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}
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runAllTests() |