public static CalendarProperty ReadFrom(CalendarReader reader)
{
var line = new CalendarProperty {
Name = reader.ReadName()
};
if (line.Name.Length == 0)
{
return(line);
}
while (reader.PeekOrRead(';'))
{
var param = CalendarPropertyParameter.ReadFrom(reader);
if (line.Parameters == null)
{
line.Parameters = new List <CalendarPropertyParameter>();
}
line.Parameters.Add(param);
}
reader.ReadChar(':');
line.Value = ReadValue(reader);
if (!reader.IsEof)
{
reader.ReadChar('\r');
}
if (!reader.IsEof)
{
reader.ReadChar('\n');
}
return(line);
}
public static CalendarPropertyParameter ReadFrom(CalendarReader reader)
{
var res = new CalendarPropertyParameter {
Name = reader.ReadName()
};
reader.ReadChar('=');
res.Values = ParseParamValues(reader);
return(res);
}
private static IList <string> ParseParamValues(CalendarReader reader)
{
var res = new List <string>();
do
{
var val = ParseParamValue(reader);
if (val == null)
{
if (res.Count == 0)
{
throw new Exception("Param value expected");
}
return(res);
}
res.Add(val);
} while (reader.PeekOrRead(','));
return(res);
}
private static string ParseParamValue(CalendarReader reader)
{
StringBuilder sb = null;
while (!reader.IsEof)
{
var ch = reader.PeekChar();
if (ch == ':' || ch == ';' || ch == ',' || ch == '"' || ch == 0x7f || (ch < 0x20 && ch != 0x09))
{
return(sb?.ToString());
}
ch = reader.ReadChar();
if (sb == null)
{
sb = new StringBuilder();
}
sb.Append(ch);
}
return(sb?.ToString());
}
public static CalendarObject Parse(CalendarReader reader)
{
var begin = CalendarProperty.ReadFrom(reader);
if (begin.NameUpper != "BEGIN")
{
throw new Exception("object expected");
}
var type = begin.ValueUpper;
var obj = CreateObject(type);
while (!reader.IsEof)
{
var pos = reader.GetPosition();
var line = CalendarProperty.ReadFrom(reader);
switch (line.NameUpper)
{
case "BEGIN":
reader.SetPosition(pos);
var sub = Parse(reader);
obj.Children.Add(sub);
break;
case "END":
if (line.ValueUpper != type)
{
throw new Exception($"Expected {type} object close but {line.ValueUpper} appeared");
}
return(obj);
default:
obj.Properties.Add(line);
break;
}
}
return(obj);
}
private static string ReadValue(CalendarReader reader)
{
var preview = reader.PeekChar();
if (preview == '"')
{
return(reader.ReadQuotedString());
}
var sb = new StringBuilder();
while (!reader.IsEof)
{
var ch = reader.PeekChar();
if ((ch == '\t' || ch >= 0x20) && ch != 0x7f)
{
sb.Append(reader.ReadChar());
}
else
{
return(sb.ToString());
}
}
return(sb.ToString());
}
