Utf8JsonReader should store if parsed number contains exponent (dotnet#34386)

* Store if number contains exponent

* Store number format directly

Author: tkp1n

src/System.Text.Json/src/System/Text/Json/JsonReaderState.cs

@@ -22,6 +22,7 @@ public struct JsonReaderState
         internal int _maxDepth;
         internal bool _inObject;
         internal bool _isNotPrimitive;
+        internal char _numberFormat;
         internal JsonTokenType _tokenType;
         internal JsonTokenType _previousTokenType;
         internal JsonReaderOptions _readerOptions;
@@ -69,6 +70,7 @@ public JsonReaderState(int maxDepth = DefaultMaxDepth, JsonReaderOptions options
             _maxDepth = maxDepth;
             _inObject = default;
             _isNotPrimitive = default;
+            _numberFormat = default;
             _tokenType = default;
             _previousTokenType = default;
             _readerOptions = options;

src/System.Text.Json/src/System/Text/Json/Utf8JsonReader.MultiSegment.cs

@@ -34,6 +34,7 @@ public Utf8JsonReader(in ReadOnlySequence<byte> jsonData, bool isFinalBlock, Jso
             _maxDepth = state._maxDepth == 0 ? JsonReaderState.DefaultMaxDepth : state._maxDepth; // If max depth is not set, revert to the default depth.
             _inObject = state._inObject;
             _isNotPrimitive = state._isNotPrimitive;
+            _numberFormat = state._numberFormat;
             _tokenType = state._tokenType;
             _previousTokenType = state._previousTokenType;
             _readerOptions = state._readerOptions;
@@ -1108,6 +1109,7 @@ private bool TryGetNumberMultiSegment(ReadOnlySpan<byte> data, out int consumed)
             // TODO: https://github.com/dotnet/corefx/issues/33294
             Debug.Assert(data.Length > 0);
 
+            _numberFormat = default;
             SequencePosition startPosition = _currentPosition;
             int startConsumed = _consumed;
             consumed = 0;
@@ -1199,6 +1201,7 @@ private bool TryGetNumberMultiSegment(ReadOnlySpan<byte> data, out int consumed)
 
             Debug.Assert(nextByte == 'E' || nextByte == 'e');
             i++;
+            _numberFormat = 'e';
             _bytePositionInLine++;
 
             signResult = ConsumeSignMultiSegment(ref data, ref i);

src/System.Text.Json/src/System/Text/Json/Utf8JsonReader.TryGet.cs

@@ -125,8 +125,7 @@ public bool TryGetSingleValue(out float value)
             }
 
             ReadOnlySpan<byte> span = HasValueSequence ? ValueSequence.ToArray() : ValueSpan;
-            char standardFormat = span.IndexOfAny((byte)'e', (byte)'E') >= 0 ? 'e' : default;
-            return Utf8Parser.TryParse(span, out value, out int bytesConsumed, standardFormat) && span.Length == bytesConsumed;
+            return Utf8Parser.TryParse(span, out value, out int bytesConsumed, _numberFormat) && span.Length == bytesConsumed;
         }
 
         /// <summary>
@@ -147,8 +146,7 @@ public bool TryGetDoubleValue(out double value)
             }
 
             ReadOnlySpan<byte> span = HasValueSequence ? ValueSequence.ToArray() : ValueSpan;
-            char standardFormat = span.IndexOfAny((byte)'e', (byte)'E') >= 0 ? 'e' : default;
-            return Utf8Parser.TryParse(span, out value, out int bytesConsumed, standardFormat) && span.Length == bytesConsumed;
+            return Utf8Parser.TryParse(span, out value, out int bytesConsumed, _numberFormat) && span.Length == bytesConsumed;
         }
 
         /// <summary>
@@ -169,8 +167,7 @@ public bool TryGetDecimalValue(out decimal value)
             }
 
             ReadOnlySpan<byte> span = HasValueSequence ? ValueSequence.ToArray() : ValueSpan;
-            char standardFormat = span.IndexOfAny((byte)'e', (byte)'E') >= 0 ? 'e' : default;
-            return Utf8Parser.TryParse(span, out value, out int bytesConsumed, standardFormat) && span.Length == bytesConsumed;
+            return Utf8Parser.TryParse(span, out value, out int bytesConsumed, _numberFormat) && span.Length == bytesConsumed;
         }
     }
 }

src/System.Text.Json/src/System/Text/Json/Utf8JsonReader.cs

@@ -30,6 +30,7 @@ public ref partial struct Utf8JsonReader
         private int _maxDepth;
         private bool _inObject;
         private bool _isNotPrimitive;
+        private char _numberFormat;
         private JsonTokenType _tokenType;
         private JsonTokenType _previousTokenType;
         private JsonReaderOptions _readerOptions;
@@ -130,6 +131,7 @@ public SequencePosition Position
             _maxDepth = _maxDepth,
             _inObject = _inObject,
             _isNotPrimitive = _isNotPrimitive,
+            _numberFormat = _numberFormat,
             _tokenType = _tokenType,
             _previousTokenType = _previousTokenType,
             _readerOptions = _readerOptions,
@@ -160,6 +162,7 @@ public Utf8JsonReader(ReadOnlySpan<byte> jsonData, bool isFinalBlock, JsonReader
             _maxDepth = state._maxDepth == 0 ? JsonReaderState.DefaultMaxDepth : state._maxDepth; // If max depth is not set, revert to the default depth.
             _inObject = state._inObject;
             _isNotPrimitive = state._isNotPrimitive;
+            _numberFormat = state._numberFormat;
             _tokenType = state._tokenType;
             _previousTokenType = state._previousTokenType;
             _readerOptions = state._readerOptions;
@@ -900,6 +903,7 @@ private bool TryGetNumber(ReadOnlySpan<byte> data, out int consumed)
             // TODO: https://github.com/dotnet/corefx/issues/33294
             Debug.Assert(data.Length > 0);
 
+            _numberFormat = default;
             consumed = 0;
             int i = 0;
 
@@ -977,6 +981,7 @@ private bool TryGetNumber(ReadOnlySpan<byte> data, out int consumed)
 
             Debug.Assert(nextByte == 'E' || nextByte == 'e');
             i++;
+            _numberFormat = 'e';
 
             signResult = ConsumeSign(ref data, ref i);
             if (signResult == ConsumeNumberResult.NeedMoreData)