fix when emphasizing the empty string (#811)

bolsinga · Jun 15, 2024 · 552914b · 552914b
1 parent 86d6b3d
commit 552914b
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diff --git a/Sources/Site/Utility/String+EmphasizedMatching.swift b/Sources/Site/Utility/String+EmphasizedMatching.swift
@@ -10,6 +10,8 @@ import RegexBuilder
 
 extension String {
   func emphasized(matching fragment: String) -> String {
+    guard !fragment.isEmpty else { return self }
+
     let regex = Regex {
       Capture {
         fragment

diff --git a/Tests/SiteTests/EmphasizedMatchingTests.swift b/Tests/SiteTests/EmphasizedMatchingTests.swift
@@ -29,4 +29,12 @@ final class EmphasizedMatchingTests: XCTestCase {
     XCTAssertEqual("Gregr".emphasized(matching: "Gr"), "**Gr**egr")
     XCTAssertEqual("GregR".emphasized(matching: "gr"), "**Gr**egR")
   }
+
+  func testNoMatches() throws {
+    XCTAssertEqual("Greg".emphasized(matching: "o"), "Greg")
+  }
+
+  func testEmptyStringMatches() throws {
+    XCTAssertEqual("Greg".emphasized(matching: ""), "Greg")
+  }
 }