private List <NamedResultValue> ParseResultList(EdgeCondition begin, EdgeCondition end, Span input, out Span rest)
{
rest = Span.Empty;
List <NamedResultValue> list = new List <NamedResultValue>();
int i = input.Start;
if (!begin(input, ref i))
{
ParseError("Unexpected opening character", input);
return(null);
}
if (end(input, ref i)) // tuple is empty
{
rest = input.AdvanceTo(i); // eat through the closing brace
return(list);
}
input = input.AdvanceTo(i);
var item = ParseResult(input, out rest);
if (item == null)
{
ParseError("Result expected", input);
return(null);
}
list.Add(item);
input = rest;
while (!input.IsEmpty && _resultString[input.Start] == ',')
{
item = ParseResult(input.Advance(1), out rest);
if (item == null)
{
ParseError("Result expected", input);
return(null);
}
list.Add(item);
input = rest;
}
i = input.Start;
if (!end(input, ref i)) // tuple is not closed
{
ParseError("Unexpected list termination", input);
rest = Span.Empty;
return(null);
}
rest = input.AdvanceTo(i);
return(list);
}
private ConstValue ParseCString(Span input, out Span rest)
{
rest = input;
StringBuilder output = new StringBuilder();
if (input.IsEmpty || _resultString[input.Start] != '\"')
{
ParseError("Cstring expected", input);
return(null);
}
int i = input.Start + 1;
bool endFound = false;
for (; i < input.Extent; i++)
{
char c = _resultString[i];
if (c == '\"')
{
// closing quote, so we are (probably) done
i++;
if ((i < input.Extent) && (_resultString[i] == c))
{
// double quotes mean we emit a single quote, and carry on
;
}
else
{
endFound = true;
break;
}
}
else if (c == '\\')
{
// escaped character
c = _resultString[++i];
switch (c)
{
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
default: break;
}
}
output.Append(c);
}
if (!endFound)
{
ParseError("CString not terminated", input);
return(null);
}
rest = input.AdvanceTo(i);
return(new ConstValue(output.ToString()));
}
/// <summary>
/// result-record ==> result-class ( "," result )*
/// </summary>
/// <param name="output"></param>
public Results ParseCommandOutput(string output)
{
_resultString = output.Trim();
int comma = _resultString.IndexOf(',');
Results results;
ResultClass resultClass = ResultClass.None;
if (comma < 0)
{
// no comma, so entire string should be the result class
results = new Results(ParseResultClass(output), new List <NamedResultValue>());
}
else
{
resultClass = ParseResultClass(output.Substring(0, comma));
Span wholeString = new Span(_resultString);
results = ParseResultList(wholeString.AdvanceTo(comma + 1), resultClass);
}
return(results);
}
