refactor(perf): Makes static regexes global

This reduces the benchmark `graphql` time by 51%, and malloc calls by 77%

Author: NeedleInAJayStack

Sources/GraphQL/Error/SyntaxError.swift

@@ -53,15 +53,14 @@ func splitLines(string: String) -> [String] {
     var location = 0
 
     let nsstring = NSString(string: string)
-    do {
-        let regex = try NSRegularExpression(pattern: "\r\n|[\n\r]", options: [])
-        for match in regex.matches(in: string, options: [], range: NSRange(0 ..< nsstring.length)) {
-            let range = NSRange(location ..< match.range.location)
-            lines.append(nsstring.substring(with: range))
-            location = match.range.location + match.range.length
-        }
-    } catch {
-        // Let lines and location remain unchanged
+    for match in newLineRegex.matches(
+        in: string,
+        options: [],
+        range: NSRange(0 ..< nsstring.length)
+    ) {
+        let range = NSRange(location ..< match.range.location)
+        lines.append(nsstring.substring(with: range))
+        location = match.range.location + match.range.length
     }
 
     if lines.isEmpty {

Sources/GraphQL/Language/Location.swift

@@ -18,20 +18,17 @@ func getLocation(source: Source, position: Int) -> SourceLocation {
     var line = 1
     var column = position + 1
 
-    do {
-        let regex = try NSRegularExpression(pattern: "\r\n|[\n\r]", options: [])
-        let matches = regex.matches(
-            in: source.body,
-            options: [],
-            range: NSRange(0 ..< source.body.utf16.count)
-        )
-        for match in matches where match.range.location < position {
-            line += 1
-            column = position + 1 - (match.range.location + match.range.length)
-        }
-    } catch {
-        // Leave line and position unset if regex fails
+    let matches = newLineRegex.matches(
+        in: source.body,
+        options: [],
+        range: NSRange(0 ..< source.body.utf16.count)
+    )
+    for match in matches where match.range.location < position {
+        line += 1
+        column = position + 1 - (match.range.location + match.range.length)
     }
 
     return SourceLocation(line: line, column: column)
 }
+
+let newLineRegex = try! NSRegularExpression(pattern: "\r\n|[\n\r]", options: [])

Sources/GraphQL/Utilities/AssertValidName.swift

@@ -12,9 +12,7 @@ public enum InvalidNameError: Error, CustomStringConvertible {
 }
 
 func assertValid(name: String) throws {
-    let regex = try NSRegularExpression(pattern: "^[_a-zA-Z][_a-zA-Z0-9]*$", options: [])
-
-    let range = regex.rangeOfFirstMatch(
+    let range = validNameRegex.rangeOfFirstMatch(
         in: name,
         options: [],
         range: NSRange(0 ..< name.utf16.count)
@@ -24,3 +22,8 @@ func assertValid(name: String) throws {
         throw InvalidNameError.invalidName(name)
     }
 }
+
+private let validNameRegex = try! NSRegularExpression(
+    pattern: "^[_a-zA-Z][_a-zA-Z0-9]*$",
+    options: []
+)