/// <exception cref="System.IO.IOException"/>
private static com.fasterxml.jackson.core.format.MatchStrength tryMatch(com.fasterxml.jackson.core.format.InputAccessor
acc, string matchStr, com.fasterxml.jackson.core.format.MatchStrength fullMatchStrength
)
{
for (int i = 0; i < len; ++i)
{
if (!acc.hasMoreBytes())
{
return com.fasterxml.jackson.core.format.MatchStrength.INCONCLUSIVE;
}
if (acc.nextByte() != matchStr[i])
{
return com.fasterxml.jackson.core.format.MatchStrength.NO_MATCH;
}
}
return fullMatchStrength;
}
/// <exception cref="System.IO.IOException"/>
private static int skipSpace(com.fasterxml.jackson.core.format.InputAccessor acc)
{
if (!acc.hasMoreBytes())
{
return -1;
}
return skipSpace(acc, acc.nextByte());
}
/// <exception cref="System.IO.IOException"/>
private static int skipSpace(com.fasterxml.jackson.core.format.InputAccessor acc,
byte b)
{
while (true)
{
int ch = (int)b & unchecked((int)(0xFF));
if (!(ch == ' ' || ch == '\r' || ch == '\n' || ch == '\t'))
{
return ch;
}
if (!acc.hasMoreBytes())
{
return -1;
}
b = acc.nextByte();
ch = (int)b & unchecked((int)(0xFF));
}
}
/*
/**********************************************************
/* Encoding detection for data format auto-detection
/**********************************************************
*/
/// <summary>
/// Current implementation is not as thorough as other functionality
/// (
/// <see cref="ByteSourceJsonBootstrapper"/>
/// );
/// supports UTF-8, for example. But it should work, for now, and can
/// be improved as necessary.
/// </summary>
/// <exception cref="System.IO.IOException"/>
public static com.fasterxml.jackson.core.format.MatchStrength hasJSONFormat(com.fasterxml.jackson.core.format.InputAccessor
acc)
{
// Ideally we should see "[" or "{"; but if not, we'll accept double-quote (String)
// in future could also consider accepting non-standard matches?
if (!acc.hasMoreBytes())
{
return com.fasterxml.jackson.core.format.MatchStrength.INCONCLUSIVE;
}
byte b = acc.nextByte();
// Very first thing, a UTF-8 BOM?
if (b == UTF8_BOM_1)
{
// yes, looks like UTF-8 BOM
if (!acc.hasMoreBytes())
{
return com.fasterxml.jackson.core.format.MatchStrength.INCONCLUSIVE;
}
if (acc.nextByte() != UTF8_BOM_2)
{
return com.fasterxml.jackson.core.format.MatchStrength.NO_MATCH;
}
if (!acc.hasMoreBytes())
{
return com.fasterxml.jackson.core.format.MatchStrength.INCONCLUSIVE;
}
if (acc.nextByte() != UTF8_BOM_3)
{
return com.fasterxml.jackson.core.format.MatchStrength.NO_MATCH;
}
if (!acc.hasMoreBytes())
{
return com.fasterxml.jackson.core.format.MatchStrength.INCONCLUSIVE;
}
b = acc.nextByte();
}
// Then possible leading space
int ch = skipSpace(acc, b);
if (ch < 0)
{
return com.fasterxml.jackson.core.format.MatchStrength.INCONCLUSIVE;
}
// First, let's see if it looks like a structured type:
if (ch == '{')
{
// JSON object?
// Ideally we need to find either double-quote or closing bracket
ch = skipSpace(acc);
if (ch < 0)
{
return com.fasterxml.jackson.core.format.MatchStrength.INCONCLUSIVE;
}
if (ch == '"' || ch == '}')
{
return com.fasterxml.jackson.core.format.MatchStrength.SOLID_MATCH;
}
// ... should we allow non-standard? Let's not yet... can add if need be
return com.fasterxml.jackson.core.format.MatchStrength.NO_MATCH;
}
com.fasterxml.jackson.core.format.MatchStrength strength;
if (ch == '[')
{
ch = skipSpace(acc);
if (ch < 0)
{
return com.fasterxml.jackson.core.format.MatchStrength.INCONCLUSIVE;
}
// closing brackets is easy; but for now, let's also accept opening...
if (ch == ']' || ch == '[')
{
return com.fasterxml.jackson.core.format.MatchStrength.SOLID_MATCH;
}
return com.fasterxml.jackson.core.format.MatchStrength.SOLID_MATCH;
}
else
{
// plain old value is not very convincing...
strength = com.fasterxml.jackson.core.format.MatchStrength.WEAK_MATCH;
}
if (ch == '"')
{
// string value
return strength;
}
if (ch <= '9' && ch >= '0')
{
// number
return strength;
}
if (ch == '-')
{
// negative number
ch = skipSpace(acc);
if (ch < 0)
{
return com.fasterxml.jackson.core.format.MatchStrength.INCONCLUSIVE;
}
return (ch <= '9' && ch >= '0') ? strength : com.fasterxml.jackson.core.format.MatchStrength
.NO_MATCH;
}
// or one of literals
if (ch == 'n')
{
// null
return tryMatch(acc, "ull", strength);
}
if (ch == 't')
{
// true
return tryMatch(acc, "rue", strength);
}
if (ch == 'f')
{
// false
return tryMatch(acc, "alse", strength);
}
return com.fasterxml.jackson.core.format.MatchStrength.NO_MATCH;
}
