public string Parse(string text, GetValueForKeyFunc getValueForKeyFunc)
{
using (var reader = new StringReader(text))
{
var parser = new NamedFieldParser(getValueForKeyFunc);
do
{
parser.Current = reader.Read();
switch (parser.State)
{
case ParsingState.Text:
HandleRegularCharacter(parser);
break;
case ParsingState.StartOfExpression:
HandleStartOfExpression(parser);
break;
case ParsingState.Expression:
HandleFieldExpression(parser);
break;
case ParsingState.EndOfExpression:
HandleEndOfExpression(parser);
break;
}
} while (parser.State != ParsingState.EndOfFile);
return parser.FormattedText.ToString();
}
}
public string Parse(string text, GetValueForKeyFunc getValueForKeyFunc)
{
using (var reader = new StringReader(text))
{
var parser = new NamedFieldParser(getValueForKeyFunc);
do
{
parser.Current = reader.Read();
switch (parser.State)
{
case ParsingState.Text:
HandleRegularCharacter(parser);
break;
case ParsingState.StartOfExpression:
HandleStartOfExpression(parser);
break;
case ParsingState.Expression:
HandleFieldExpression(parser);
break;
case ParsingState.EndOfExpression:
HandleEndOfExpression(parser);
break;
}
} while (parser.State != ParsingState.EndOfFile);
return(parser.FormattedText.ToString());
}
}
private static void HandleEndOfExpression(NamedFieldParser parser)
{
if (parser.Current != CloseBrace)
{
throw new FormatException("Unescaped closing brace found at position " + parser.Position + ".");
}
parser.FormattedText.Append((char)CloseBrace);
parser.State = ParsingState.Text;
}
private static void HandleFieldExpression(NamedFieldParser parser)
{
switch (parser.Current)
{
case NoMoreText:
throw new FormatException("Opening brace with field expression '" + parser.FieldExpression +
"' has no closing brace at position " + parser.Position + ".");
case CloseBrace:
InsertValueForPlaceholder(parser);
parser.State = ParsingState.Text;
break;
default:
parser.FieldExpression.Append((char)parser.Current);
break;
}
}
private static void HandleStartOfExpression(NamedFieldParser parser)
{
switch (parser.Current)
{
case NoMoreText:
case CloseBrace:
throw new FormatException("Opening brace with no field name specified at position " + parser.Position + ".");
case OpenBrace:
parser.FormattedText.Append((char)OpenBrace);
parser.State = ParsingState.Text;
break;
default:
parser.FieldExpression.Append((char)parser.Current);
parser.State = ParsingState.Expression;
break;
}
}
private static void HandleRegularCharacter(NamedFieldParser parser)
{
switch (parser.Current)
{
case NoMoreText:
parser.State = ParsingState.EndOfFile;
break;
case OpenBrace:
parser.State = ParsingState.StartOfExpression;
break;
case CloseBrace:
parser.State = ParsingState.EndOfExpression;
break;
default:
parser.FormattedText.Append((char)parser.Current);
break;
}
}
private static void HandleFieldExpression(NamedFieldParser parser)
{
switch (parser.Current)
{
case NoMoreText:
throw new FormatException("Opening brace with field expression '" + parser.FieldExpression +
"' has no closing brace at position " + parser.Position + ".");
case CloseBrace:
InsertValueForPlaceholder(parser);
parser.State = ParsingState.Text;
break;
default:
parser.FieldExpression.Append((char) parser.Current);
break;
}
}
private static void HandleEndOfExpression(NamedFieldParser parser)
{
if (parser.Current != CloseBrace)
throw new FormatException("Unescaped closing brace found at position " + parser.Position + ".");
parser.FormattedText.Append((char) CloseBrace);
parser.State = ParsingState.Text;
}
private static void InsertValueForPlaceholder(NamedFieldParser parser)
{
parser.FormattedText.Append(parser.GetValueForKeyFunc(parser.FieldExpression.ToString()));
parser.FieldExpression.Clear();
}
private static void HandleStartOfExpression(NamedFieldParser parser)
{
switch (parser.Current)
{
case NoMoreText:
case CloseBrace:
throw new FormatException("Opening brace with no field name specified at position " + parser.Position + ".");
case OpenBrace:
parser.FormattedText.Append((char) OpenBrace);
parser.State = ParsingState.Text;
break;
default:
parser.FieldExpression.Append((char)parser.Current);
parser.State = ParsingState.Expression;
break;
}
}
private static void HandleRegularCharacter(NamedFieldParser parser)
{
switch (parser.Current)
{
case NoMoreText:
parser.State = ParsingState.EndOfFile;
break;
case OpenBrace:
parser.State = ParsingState.StartOfExpression;
break;
case CloseBrace:
parser.State = ParsingState.EndOfExpression;
break;
default:
parser.FormattedText.Append((char) parser.Current);
break;
}
}
private static void InsertValueForPlaceholder(NamedFieldParser parser)
{
parser.FormattedText.Append(parser.GetValueForKeyFunc(parser.FieldExpression.ToString()));
parser.FieldExpression.Clear();
}
