santoshrajan · October 11, 2017 07:15 · Oct 11, 2017
diff --git a/string-parser.swift b/string-parser.swift
@@ -0,0 +1,26 @@
+import Foundation
+
+typealias ParseResult = (output: Any, rest: Substring)?
+
+func stringParser(input: Substring) -> ParseResult {
+    if input[input.startIndex] != "\"" {
+        return nil
+    }
+    var isEscape = true
+    func inspectChar(char: Character) -> Bool {
+        if char == "\"" && !isEscape {
+            return true
+        }
+        if char == "\\" {
+            isEscape = true
+        } else {
+            isEscape = false
+        }
+        return false
+    }
+    if let index = input.index(where: inspectChar) {
+        return (input[input.index(after: input.startIndex)...input.index(before: index)],
+                input[input.index(after: index)...])
+    }
+    return nil
+}