public MessageTemplate Parse(string messageTemplate)
{
if (messageTemplate == null)
{
throw new ArgumentNullException(nameof(messageTemplate));
}
if (messageTemplate.Length == 0)
{
return(new MessageTemplate(Array.Empty <MessageTemplate.Token>()));
}
var chars = new CharsReadOnlyList(messageTemplate);
var cursor = new ElementsCursor <char>(chars, EndOfInput);
var tokens = new List <MessageTemplate.Token>();
while (!cursor.IsAtTheEnd())
{
switch (cursor.Peek())
{
case '{':
if (cursor.Peek(1) == '{')
{
// Escaped opening bracket
tokens.Add(ScanTextToken(cursor));
}
else
{
// Argument
tokens.Add(ScanArgumentToken(messageTemplate, cursor));
}
break;
case '}':
if (cursor.Peek(1) == '}')
{
// Escaped closing bracket
tokens.Add(ScanTextToken(cursor));
}
else
{
throw new FormatException($"Unescaped closing bracket at symbol {cursor.Position}.");
}
break;
default:
tokens.Add(ScanTextToken(cursor));
break;
}
}
return(new MessageTemplate(tokens.ToArray()));
}
public IEnumerable <SyntaxToken> Lex(string commandLine, CancellationToken cancellation = default)
{
if (commandLine == null)
{
throw new ArgumentNullException(nameof(commandLine));
}
cancellation.ThrowIfCancellationRequested();
var chars = new CharsReadOnlyList(commandLine);
var cursor = new ElementsCursor <char>(chars, EndOfInput);
var builder = new SyntaxTokenBuilder();
do
{
builder.LeadingTrivia = LexSyntaxTrivia(commandLine, cursor);
LexSyntaxToken(builder, commandLine, cursor);
builder.TrailingTrivia = LexSyntaxTrivia(commandLine, cursor);
cancellation.ThrowIfCancellationRequested();
yield return(builder.Build());
} while (builder.Kind != SyntaxKind.EndOfInputToken);
}
