public BsonJsonReader(
BsonJsonBuffer buffer
)
{
this.buffer = buffer;
this.context = new BsonJsonReaderContext(null, ContextType.TopLevel);
}
public static JsonToken GetNextToken(
BsonJsonBuffer buffer
)
{
// skip leading whitespace
var c = buffer.Read();
while (c != -1 && char.IsWhiteSpace((char) c)) {
c = buffer.Read();
}
if (c == -1) {
return new JsonToken(JsonTokenType.EndOfFile, "<eof>");
}
// leading character determines token type
switch (c) {
case '{': return new JsonToken(JsonTokenType.BeginObject, "{");
case '}': return new JsonToken(JsonTokenType.EndObject, "}");
case '[': return new JsonToken(JsonTokenType.BeginArray, "[");
case ']': return new JsonToken(JsonTokenType.EndArray, "]");
case ':': return new JsonToken(JsonTokenType.Colon, ":");
case ',': return new JsonToken(JsonTokenType.Comma, ",");
case '"': return GetStringToken(buffer);
case '/': return GetRegularExpressionToken(buffer);
default:
if (c == '-' || char.IsDigit((char) c)) {
return GetNumberToken(buffer, c);
} else if (c == '$' || char.IsLetter((char) c)) {
return GetUnquotedStringToken(buffer);
} else {
buffer.UnRead(c);
throw new FileFormatException(FormatMessage("Invalid JSON input", buffer, buffer.Position));
}
}
}
public void TestBeginObject()
{
var json = "\t {x";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.BeginObject, token.Type);
Assert.AreEqual("{", token.Lexeme);
Assert.AreEqual('x', buffer.Read());
}
public void Test3CharacterString()
{
var json = "\t \"123\"x";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.String, token.Type);
Assert.AreEqual("123", token.Lexeme);
Assert.AreEqual('x', buffer.Read());
}
public void TestEndOfFile()
{
var json = "\t ";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.EndOfFile, token.Type);
Assert.AreEqual("<eof>", token.Lexeme);
Assert.AreEqual(-1, buffer.Read());
}
public static BsonReader Create(
BsonJsonBuffer buffer
)
{
return new BsonJsonReader(buffer);
}
private static JsonToken GetStringToken(
BsonJsonBuffer buffer
)
{
// opening quote has already been read
var start = buffer.Position - 1;
var sb = new StringBuilder();
while (true) {
var c = buffer.Read();
switch (c) {
case '\\':
c = buffer.Read();
switch (c) {
case '"': sb.Append('"'); break;
case '\\': sb.Append('\\'); break;
case '/': sb.Append('/'); break;
case 'b': sb.Append('\b'); break;
case 'f': sb.Append('\f'); break;
case 'n': sb.Append('\n'); break;
case 'r': sb.Append('\r'); break;
case 't': sb.Append('\t'); break;
case 'u':
var u1 = buffer.Read();
var u2 = buffer.Read();
var u3 = buffer.Read();
var u4 = buffer.Read();
if (u4 != -1) {
var hex = new string(new char[] { (char) u1, (char) u2, (char) u3, (char) u4 });
var n = Convert.ToInt32(hex, 16);
sb.Append((char) n);
}
break;
default:
if (c != -1) {
var message = string.Format("Invalid escape sequence in JSON string: '\\{0}'", (char) c);
throw new FileFormatException(message);
}
break;
}
break;
case '"':
return new JsonToken(JsonTokenType.String, sb.ToString());
default:
if (c != -1) {
sb.Append((char) c);
}
break;
}
if (c == -1) {
throw new FileFormatException(FormatMessage("End of file in JSON string", buffer, start));
}
}
}
private static JsonToken GetNumberToken(
BsonJsonBuffer buffer,
int c // first character
)
{
// leading digit or '-' has already been read
var start = buffer.Position - 1;
NumberState state;
switch (c) {
case '-': state = NumberState.SawLeadingMinus; break;
case '0': state = NumberState.SawLeadingZero; break;
default: state = NumberState.SawIntegerDigits; break;
}
var type = JsonTokenType.Integer; // assume integer until proved otherwise
while (true) {
c = buffer.Read();
switch (state) {
case NumberState.SawLeadingMinus:
switch (c) {
case '0':
state = NumberState.SawLeadingZero;
break;
default:
if (char.IsDigit((char) c)) {
state = NumberState.SawIntegerDigits;
} else {
state = NumberState.Invalid;
}
break;
}
break;
case NumberState.SawLeadingZero:
switch (c) {
case '.':
state = NumberState.SawDecimalPoint;
break;
case 'e':
case 'E':
state = NumberState.SawExponentLetter;
break;
case ',':
case '}':
case ']':
case -1:
state = NumberState.Done;
break;
default:
if (char.IsWhiteSpace((char) c)) {
state = NumberState.Done;
} else {
state = NumberState.Invalid;
}
break;
}
break;
case NumberState.SawIntegerDigits:
switch (c) {
case '.':
state = NumberState.SawDecimalPoint;
break;
case 'e':
case 'E':
state = NumberState.SawExponentLetter;
break;
case ',':
case '}':
case ']':
case -1:
state = NumberState.Done;
break;
default:
if (char.IsDigit((char) c)) {
state = NumberState.SawIntegerDigits;
} else if (char.IsWhiteSpace((char) c)) {
state = NumberState.Done;
} else {
state = NumberState.Invalid;
}
break;
}
break;
case NumberState.SawDecimalPoint:
type = JsonTokenType.FloatingPoint;
if (char.IsDigit((char) c)) {
state = NumberState.SawFractionDigits;
} else {
state = NumberState.Invalid;
}
break;
case NumberState.SawFractionDigits:
switch (c) {
case 'e':
case 'E':
state = NumberState.SawExponentLetter;
break;
case ',':
case '}':
case ']':
case -1:
state = NumberState.Done;
break;
default:
if (char.IsDigit((char) c)) {
state = NumberState.SawFractionDigits;
} else if (char.IsWhiteSpace((char) c)) {
state = NumberState.Done;
} else {
state = NumberState.Invalid;
}
break;
}
break;
case NumberState.SawExponentLetter:
type = JsonTokenType.FloatingPoint;
switch (c) {
case '+':
case '-':
state = NumberState.SawExponentSign;
break;
default:
if (char.IsDigit((char) c)) {
state = NumberState.SawExponentDigits;
} else {
state = NumberState.Invalid;
}
break;
}
break;
case NumberState.SawExponentSign:
if (char.IsDigit((char) c)) {
state = NumberState.SawExponentDigits;
} else {
state = NumberState.Invalid;
}
break;
case NumberState.SawExponentDigits:
switch (c) {
case ',':
case '}':
case ']':
case -1:
state = NumberState.Done;
break;
default:
if (char.IsDigit((char) c)) {
state = NumberState.SawExponentDigits;
} else if (char.IsWhiteSpace((char) c)) {
state = NumberState.Done;
} else {
state = NumberState.Invalid;
}
break;
}
break;
}
switch (state) {
case NumberState.Done:
buffer.UnRead(c);
return new JsonToken(type, buffer.Substring(start, buffer.Position - start));
case NumberState.Invalid:
throw new FileFormatException(FormatMessage("Invalid JSON number", buffer, start));
}
}
}
public void TestRegularExpressionPatternAndOptions()
{
var json = "\t /pattern/gim,";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.RegularExpression, token.Type);
Assert.AreEqual("/pattern/gim", token.Lexeme);
Assert.AreEqual(',', buffer.Read());
}
public void TestRegularExpressionEmpty()
{
var json = "\t //,";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.RegularExpression, token.Type);
Assert.AreEqual("//", token.Lexeme);
Assert.AreEqual(',', buffer.Read());
}
public void TestOneExponentTwelve()
{
var json = "\t 1e12,";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.FloatingPoint, token.Type);
Assert.AreEqual("1e12", token.Lexeme);
Assert.AreEqual(',', buffer.Read());
}
public void TestMinusZeroExponentOne()
{
var json = "\t -0e1,";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.FloatingPoint, token.Type);
Assert.AreEqual("-0e1", token.Lexeme);
Assert.AreEqual(',', buffer.Read());
}
public void TestMinusOnePointTwo()
{
var json = "\t -1.2,";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.FloatingPoint, token.Type);
Assert.AreEqual("-1.2", token.Lexeme);
Assert.AreEqual(',', buffer.Read());
}
public void TestEscapeSequences()
{
var json = "\t \"x\\\"\\\\\\/\\b\\f\\n\\r\\t\\u0030y\"x";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.String, token.Type);
Assert.AreEqual("x\"\\/\b\f\n\r\t0y", token.Lexeme);
Assert.AreEqual('x', buffer.Read());
}
public void TestTrue()
{
var json = "\t true,";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.UnquotedString, token.Type);
Assert.AreEqual("true", token.Lexeme);
Assert.AreEqual(',', buffer.Read());
}
private static string FormatMessage(
string message,
BsonJsonBuffer buffer,
int start
)
{
var length = 20;
string snippet;
if (buffer.Position + length >= buffer.Length) {
snippet = buffer.Substring(start);
} else {
snippet = buffer.Substring(start, length) + "...";
}
return string.Format("{0}: '{1}'", message, snippet);
}
public void TestTwelve()
{
var json = "\t 12,";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.Integer, token.Type);
Assert.AreEqual("12", token.Lexeme);
Assert.AreEqual(',', buffer.Read());
}
private static JsonToken GetRegularExpressionToken(
BsonJsonBuffer buffer
)
{
// opening slash has already been read
var start = buffer.Position - 1;
var state = RegularExpressionState.InPattern;
while (true) {
var c = buffer.Read();
switch (state) {
case RegularExpressionState.InPattern:
switch (c) {
case '/': state = RegularExpressionState.InOptions; break;
case '\\': state = RegularExpressionState.InEscapeSequence; break;
default: state = RegularExpressionState.InPattern; break;
}
break;
case RegularExpressionState.InEscapeSequence:
state = RegularExpressionState.InPattern;
break;
case RegularExpressionState.InOptions:
switch (c) {
case 'g':
case 'i':
case 'm':
state = RegularExpressionState.InOptions;
break;
case ',':
case '}':
case ']':
case -1:
state = RegularExpressionState.Done;
break;
default:
if (char.IsWhiteSpace((char) c)) {
state = RegularExpressionState.Done;
} else {
state = RegularExpressionState.Invalid;
}
break;
}
break;
}
switch (state) {
case RegularExpressionState.Done:
buffer.UnRead(c);
var count = buffer.Position - start;
return new JsonToken(JsonTokenType.RegularExpression, buffer.Substring(start, count));
case RegularExpressionState.Invalid:
throw new FileFormatException(FormatMessage("Invalid JSON regular expression", buffer, start));
}
}
}
public void TestUnquotedString()
{
var json = "\t name123:1";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.UnquotedString, token.Type);
Assert.AreEqual("name123", token.Lexeme);
Assert.AreEqual(':', buffer.Read());
}
private static JsonToken GetUnquotedStringToken(
BsonJsonBuffer buffer
)
{
// opening letter or $ has already been read
var start = buffer.Position - 1;
while (true) {
var c = buffer.Read();
switch (c) {
case ':':
case ',':
case '}':
case ']':
case -1:
buffer.UnRead(c);
return new JsonToken(JsonTokenType.UnquotedString, buffer.Substring(start, buffer.Position - start));
default:
if (c == '$' || char.IsLetterOrDigit((char) c)) {
// continue
} else if (char.IsWhiteSpace((char) c)) {
buffer.UnRead(c);
return new JsonToken(JsonTokenType.UnquotedString, buffer.Substring(start, buffer.Position - start));
} else {
throw new FileFormatException(FormatMessage("Invalid JSON unquoted string", buffer, start));
}
break;
}
}
}
public void TestValueSeparator()
{
var json = "\t ,x";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.Comma, token.Type);
Assert.AreEqual(",", token.Lexeme);
Assert.AreEqual('x', buffer.Read());
}
public static BsonReader Create(
TextReader jsonTextReader
)
{
var json = new BsonJsonBuffer(jsonTextReader.ReadToEnd());
return Create(json);
}
public void TestZeroPointZero()
{
var json = "\t 0.0,";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.FloatingPoint, token.Type);
Assert.AreEqual("0.0", token.Lexeme);
Assert.AreEqual(',', buffer.Read());
}
public static BsonReader Create(
string json
)
{
var buffer = new BsonJsonBuffer(json);
return Create(buffer);
}
public void TestEndArray()
{
var json = "\t ]x";
var buffer = new BsonJsonBuffer(json);
var token = BsonJsonScanner.GetNextToken(buffer);
Assert.AreEqual(JsonTokenType.EndArray, token.Type);
Assert.AreEqual("]", token.Lexeme);
Assert.AreEqual('x', buffer.Read());
}
