Fix malformed bounds for pattern regex

CodaFi · CodaFi · commit 34ea75a35780 · 2018-03-01T03:08:47.000-05:00
diff --git a/Sources/FileCheck/Pattern.swift b/Sources/FileCheck/Pattern.swift
@@ -355,7 +355,8 @@ final class Pattern {
     guard let r = try? NSRegularExpression(pattern: regExToMatch, options: [.anchorsMatchLines]) else {
       return nil
     }
-    let matchInfo = r.matches(in: buffer, range: NSRange(location: 0, length: buffer.utf8.count))
+    let distance = buffer.distance(from: buffer.startIndex, to: buffer.endIndex)
+    let matchInfo = r.matches(in: buffer, range: NSRange(location: 0, length: distance))
 
     // Successful regex match.
     guard let fullMatch = matchInfo.first else {

Original file line number	Diff line number	Diff line change
`@@ -355,7 +355,8 @@ final class Pattern {`
`355`	`355`	`guard let r = try? NSRegularExpression(pattern: regExToMatch, options: [.anchorsMatchLines]) else {`
`356`	`356`	`return nil`
`357`	`357`	`}`
`358`		`- let matchInfo = r.matches(in: buffer, range: NSRange(location: 0, length: buffer.utf8.count))`
	`358`	`+ let distance = buffer.distance(from: buffer.startIndex, to: buffer.endIndex)`
	`359`	`+ let matchInfo = r.matches(in: buffer, range: NSRange(location: 0, length: distance))`
`359`	`360`
`360`	`361`	`// Successful regex match.`
`361`	`362`	`guard let fullMatch = matchInfo.first else {`