Fix Double fraction parsing

Sources/Jay/NumberParser.swift

@@ -36,7 +36,7 @@ struct NumberParser: JsonParser {
         //      - continue to the frac part right away
         // - if it's 1...9, continue to parsing integer part first
         let integer: Int
-        let frac: Int
+        let frac: String
         if reader.curr() == Const.Zero {
             try reader.nextAndCheckNotDone()
 
@@ -57,7 +57,7 @@ struct NumberParser: JsonParser {
             if reader.curr() == Const.DecimalPoint {
                 frac = try self.parseFrac(reader)
             } else {
-                frac = 0
+                frac = ""
             }
         }
 
@@ -70,15 +70,15 @@ struct NumberParser: JsonParser {
         return value
     }
 
-    private func generateNumber(negative: Bool, integer: Int, frac: Int, exp: Int?) -> JSON.Number {
+    private func generateNumber(negative: Bool, integer: Int, frac: String, exp: Int?) -> JSON.Number {
 
         //form the int section
         var int = integer
         let sign = negative ? -1 : 1
         int *= sign
 
         //if that's it, let's call it an integer
-        if frac == 0 && exp == nil {
+        if frac.isEmpty && exp == nil {
             if negative {
                 //if it's negative, make it a signed integer
                 return .integer(int)
@@ -92,7 +92,7 @@ struct NumberParser: JsonParser {
         var dbl = Double(int)
 
         //if it's a frac, append the fraction section
-        if frac > 0 {
+        if !frac.isEmpty {
             //double
             let fracAdd = Double("0.\(frac)")! * Double(sign)
             dbl += fracAdd
@@ -162,7 +162,7 @@ struct NumberParser: JsonParser {
         }
     }
 
-    private func parseFrac<R: Reader>(_ reader: R) throws -> Int {
+    private func parseFrac<R: Reader>(_ reader: R) throws -> String {
 
         //frac part MUST start with decimal point!
         guard reader.curr() == Const.DecimalPoint else {
@@ -200,8 +200,7 @@ struct NumberParser: JsonParser {
             if fracTerm.contains(reader.curr()) {
                 //gracefully end this section
                 let fracString = try digs.string()
-                let frac = Int(fracString)!
-                return frac
+                return fracString
             }
 
             //okay, we encountered an illegal character, error out

Tests/JayTests/ParsingTests.swift

@@ -40,6 +40,7 @@ extension ParsingTests {
         ("testNumber_Int_Negative", testNumber_Int_Negative),
         ("testNumber_Dbl_Basic", testNumber_Dbl_Basic),
         ("testNumber_Dbl_ZeroSomething", testNumber_Dbl_ZeroSomething),
+        ("testNumber_Dbl_ZeroZeroSomething", testNumber_Dbl_ZeroZeroSomething),
         ("testNumber_Dbl_MinusZeroSomething", testNumber_Dbl_MinusZeroSomething),
         ("testNumber_Dbl_Incomplete", testNumber_Dbl_Incomplete),
         ("testNumber_Dbl_Negative", testNumber_Dbl_Negative),
@@ -329,6 +330,12 @@ class ParsingTests:XCTestCase {
         XCTAssertNil(ret)
     }
 
+    func testNumber_Dbl_ZeroZeroSomething() {
+        let reader = ByteReader(content: "0.00034]")
+        let ret = try! ValueParser().parse(with: reader)
+        ensureNumber(ret, exp: JSON.Number.double(0.00034))
+    }
+
     func testNumber_Double_Exp_Normal() {
         let reader = ByteReader(content: "-24.3245e2, ")
         let ret = try! ValueParser().parse(with: reader)