private static string ReadString(SourceQueue characters)
{
StringBuilder buffer = new StringBuilder();
bool escaped = false;
while (characters.Any())
{
var c = characters.Dequeue();
if (c == '"' && !escaped)
{
break;
}
if (c == '\\' && !escaped)
{
escaped = true;
}
else if (c == 'n' && escaped)
{
buffer.Append('\n');
escaped = false;
}
else
{
escaped = false;
buffer.Append(c);
}
}
return(buffer.ToString());
}
private static string ReadLettersOrDigits(SourceQueue characters)
{
var buffer = new StringBuilder();
while (characters.Any() && (char.IsLetterOrDigit(characters.Peek()) || (characters.Peek() == '_')))
{
buffer.Append(characters.Dequeue());
}
return(buffer.ToString());
}
private static void ReadToEOL(SourceQueue characters)
{
while (characters.Any())
{
var c = characters.Dequeue();
if (c == '\r' || c == '\n')
{
return;
}
}
}
private static string ReadDigits(SourceQueue characters)
{
var buffer = new StringBuilder();
int separatorsBudget = 1;
while (characters.Any() && (char.IsDigit(characters.Peek()) || ((separatorsBudget > 0) && (characters.Peek() == '.'))))
{
var c = characters.Dequeue();
buffer.Append(c);
if (c == '.')
{
separatorsBudget -= 1;
}
}
return(buffer.ToString());
}
public static void Parse(string line, Source source, Queue <Token> tokens)
{
var chars = new SourceQueue(line);
while (chars.Any())
{
var c = chars.Dequeue();
if (c == Syntax.StartTable)
{
tokens.Enqueue(new Token.StartTable()
{
Source = source
});
}
else if (c == Syntax.EndTable)
{
tokens.Enqueue(new Token.EndTable()
{
Source = source
});
}
else if (c == Syntax.StartList)
{
tokens.Enqueue(new Token.StartList()
{
Source = source
});
}
else if (c == Syntax.EndList)
{
tokens.Enqueue(new Token.EndList()
{
Source = source
});
}
else if (c == Syntax.StartFunction)
{
tokens.Enqueue(new Token.StartFunction()
{
Source = source
});
}
else if (c == Syntax.EndFunction)
{
tokens.Enqueue(new Token.EndFunction()
{
Source = source
});
}
else if (c == Syntax.Delimiter)
{
tokens.Enqueue(new Token.Delimiter()
{
Source = source
});
}
else if (c == Syntax.KeyDelimiter)
{
tokens.Enqueue(new Token.KeyDelimiter()
{
Source = source
});
}
else if (c == Syntax.Assign)
{
tokens.Enqueue(new Token.Assign()
{
Source = source
});
}
else if (c == Syntax.MacroPrefix)
{
tokens.Enqueue(new Token.MacroPrefix()
{
Source = source
});
}
else if (c == Syntax.VariablePrefix)
{
tokens.Enqueue(new Token.VariablePrefix()
{
Source = source
});
}
else if (c == ' ' || c == '\n' || c == '\r' || c == '\t')
{
// Whitespace
}
else if (c == Syntax.Comment)
{
ReadToEOL(chars);
}
else if (c == '"')
{
tokens.Enqueue(new Token.String()
{
Value = ReadString(chars), Source = source
});
}
else if (char.IsDigit(c) || c == '+' || c == '-')
{
tokens.Enqueue(new Token.Number()
{
Value = double.Parse(c + ReadDigits(chars), CultureInfo.InvariantCulture), Source = source
});
}
else
{
var word = c + ReadLettersOrDigits(chars);
if (word == "true")
{
tokens.Enqueue(new Token.Number()
{
Value = 1, Source = source
});
}
else if (word == "false")
{
tokens.Enqueue(new Token.Number()
{
Value = 0, Source = source
});
}
else
{
tokens.Enqueue(new Token.Identifier()
{
Name = word, Source = source
});
}
}
}
}
