From d72e816cd81a53fa1d4d7afef9a464b432a7cdb0 Mon Sep 17 00:00:00 2001
From: John Sundell <john@sundell.co>
Date: Fri, 8 Mar 2019 22:04:10 +0100
Subject: [PATCH] =?UTF-8?q?Support=20=E2=80=98is=E2=80=99=20keyword?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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This change makes Splash support the `is` keyword, for example in type
pattern matching in `switch` statements.
---
 Sources/Splash/Grammar/SwiftGrammar.swift    |  2 +-
 Tests/SplashTests/Tests/StatementTests.swift | 34 ++++++++++++++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/Sources/Splash/Grammar/SwiftGrammar.swift b/Sources/Splash/Grammar/SwiftGrammar.swift
index 7ea72bd..fa05fa1 100644
--- a/Sources/Splash/Grammar/SwiftGrammar.swift
+++ b/Sources/Splash/Grammar/SwiftGrammar.swift
@@ -48,7 +48,7 @@ private extension SwiftGrammar {
         "#selector", "required", "willSet", "didSet",
         "lazy", "subscript", "defer", "inout", "while",
         "continue", "fallthrough", "repeat", "indirect",
-        "deinit"
+        "deinit", "is"
     ] as Set<String>).union(accessControlKeywords)
 
     static let accessControlKeywords: Set<String> = [
diff --git a/Tests/SplashTests/Tests/StatementTests.swift b/Tests/SplashTests/Tests/StatementTests.swift
index 0e64a92..250bfe8 100644
--- a/Tests/SplashTests/Tests/StatementTests.swift
+++ b/Tests/SplashTests/Tests/StatementTests.swift
@@ -169,6 +169,39 @@ final class StatementTests: SyntaxHighlighterTestCase {
         ])
     }
 
+    func testSwitchStatementWithTypePatternMatching() {
+        let components = highlighter.highlight("""
+        switch variable {
+        case is MyType: break
+        default: break
+        }
+        """)
+
+        XCTAssertEqual(components, [
+            .token("switch", .keyword),
+            .whitespace(" "),
+            .plainText("variable"),
+            .whitespace(" "),
+            .plainText("{"),
+            .whitespace("\n"),
+            .token("case", .keyword),
+            .whitespace(" "),
+            .token("is", .keyword),
+            .whitespace(" "),
+            .token("MyType", .type),
+            .plainText(":"),
+            .whitespace(" "),
+            .token("break", .keyword),
+            .whitespace("\n"),
+            .token("default", .keyword),
+            .plainText(":"),
+            .whitespace(" "),
+            .token("break", .keyword),
+            .whitespace("\n"),
+            .plainText("}")
+        ])
+    }
+
     func testForStatementWithStaticProperty() {
         let components = highlighter.highlight("for value in Enum.allCases { }")
 
@@ -272,6 +305,7 @@ extension StatementTests {
             ("testSwitchStatement", testSwitchStatement),
             ("testSwitchStatementWithAssociatedValues", testSwitchStatementWithAssociatedValues),
             ("testSwitchStatementWithFallthrough", testSwitchStatementWithFallthrough),
+            ("testSwitchStatementWithTypePatternMatching", testSwitchStatementWithTypePatternMatching),
             ("testForStatementWithStaticProperty", testForStatementWithStaticProperty),
             ("testForStatementWithContinue", testForStatementWithContinue),
             ("testRepeatWhileStatement", testRepeatWhileStatement)