/// <summary>
/// Consume a JSON string token
/// </summary>
/// <param name="ctx"></param>
/// <param name="throws"></param>
/// <returns></returns>
private static JsonParserContext ConsumeString(
this JsonParserContext ctx,
bool throws
)
{
if (ctx.ConsumeWhiteSpace().ConsumeAnyChar("\"", throws).IsSucceeded)
{
JSonReader src = ctx.Begin();
for (int p = src.Position, len = src.Text.Length; p < len; p++)
{
if ((src.Text[p]) == '"')
{
ctx.SetResult(
new JValue {
BoxedValue = src.Text.Substring(src.Position, p - src.Position)
}
);
src.Position = p + 1;
break;
}
}
}
return(ctx);
}
/// <summary>
/// Consume a JSON numeric token
/// </summary>
/// <param name="ctx"></param>
/// <param name="throws"></param>
/// <returns></returns>
private static JsonParserContext ConsumeNumber(
this JsonParserContext ctx,
bool throws
)
{
const string Leading = "-0123456789";
const string Allowed = Leading + ".Ee+";
if (ctx.ConsumeWhiteSpace().ConsumeAnyChar(Leading, throws).IsSucceeded)
{
JSonReader src = ctx.Begin();
for (int p = src.Position, len = src.Text.Length; p < len; p++)
{
if (Allowed.IndexOf(src.Text[p]) < 0)
{
ctx.SetResult(
new JValue {
BoxedValue = double.Parse(src.Text.Substring(src.Position - 1, p - src.Position + 1))
}
);
src.Position = p;
break;
}
}
}
return(ctx);
}
/// <summary>
/// Consume a JSON array
/// </summary>
/// <param name="ctx"></param>
/// <param name="throws"></param>
/// <returns></returns>
private static JsonParserContext ConsumeArray(
this JsonParserContext ctx,
bool throws
)
{
if (ctx.ConsumeWhiteSpace().ConsumeAnyChar("[", throws).IsSucceeded)
{
var jctr = new JArray();
bool shouldThrow = false;
do
{
ctx.Begin();
if (ctx.ConsumeValue(shouldThrow).IsSucceeded)
{
jctr.Add((JToken)ctx.Result);
}
shouldThrow = true;
}while ((char)ctx.ConsumeWhiteSpace().ConsumeAnyChar(",]", true).Result == ',');
ctx.SetResult(jctr);
}
return(ctx);
}
/// <summary>
/// Consume a JSON object
/// </summary>
/// <param name="ctx"></param>
/// <param name="throws"></param>
/// <returns></returns>
private static JsonParserContext ConsumeObject(
this JsonParserContext ctx,
bool throws
)
{
if (ctx.ConsumeWhiteSpace().ConsumeAnyChar("{", throws).IsSucceeded)
{
var jctr = new JObject();
bool shouldThrow = false;
do
{
ctx.Begin();
if (ctx.ConsumeString(shouldThrow).IsSucceeded)
{
var name = (string)(JValue)ctx.Result;
ctx.ConsumeWhiteSpace()
.ConsumeAnyChar(":", true)
.ConsumeValue(true);
jctr.Add(name, (JToken)ctx.Result);
}
shouldThrow = true;
}while ((char)ctx.ConsumeWhiteSpace().ConsumeAnyChar(",}", true).Result == ',');
ctx.SetResult(jctr);
}
return(ctx);
}
/// <summary>
/// Consume all the characters in the specified sequence
/// </summary>
/// <param name="ctx"></param>
/// <param name="sequence"></param>
/// <param name="throws"></param>
/// <returns></returns>
private static JsonParserContext ConsumeAllChars(
this JsonParserContext ctx,
string sequence,
bool throws
)
{
JSonReader src = ctx.Begin();
for (int q = 0, p = src.Position; q < sequence.Length; q++, p++)
{
if (src.Text[p] != sequence[q])
{
if (throws)
{
throw new JsonParseException("Expected char not found.");
}
return(ctx);
}
}
src.Position += sequence.Length;
ctx.SetResult(sequence);
return(ctx);
}
/// <summary>
/// Consume an arbitrary number of whitespace characters
/// </summary>
/// <param name="ctx"></param>
/// <returns></returns>
private static JsonParserContext ConsumeWhiteSpace(
this JsonParserContext ctx
)
{
JSonReader src = ctx.Begin();
for (int p = src.Position, len = src.Text.Length; p < len; p++)
{
if (WhiteSpace.IndexOf(src.Text[p]) < 0)
{
src.Position = p;
break;
}
}
return(ctx);
}
/// <summary>
/// Consume any character (at least one) in the specified set
/// </summary>
/// <param name="ctx"></param>
/// <param name="charset"></param>
/// <param name="throws"></param>
/// <returns></returns>
private static JsonParserContext ConsumeAnyChar(
this JsonParserContext ctx,
string charset,
bool throws
)
{
JSonReader src = ctx.Begin();
char c;
if (charset.IndexOf(c = src.Text[src.Position]) >= 0)
{
src.Position++;
ctx.SetResult(c);
}
else if (throws)
{
throw new JsonParseException("Expected char not found.");
}
return(ctx);
}