public override async Task <Completion> WriteToAsync(TextWriter writer, TextEncoder encoder, TemplateContext context)
{
TextStatement statement = new TextStatement("Hej!");
await statement.WriteToAsync(writer, encoder, context);
return(Completion.Normal);
}
private Statement ParseStatement()
{
switch (Current.TokenType)
{
case TokenType.EOF:
return(null);
case TokenType.Print:
return(ParsePrintStatement());
case TokenType.Set:
return(ParseSetStatement());
case TokenType.If:
return(ParseIfStatement());
case TokenType.Foreach:
return(ParseForeachStatement());
case TokenType.For:
return(ParseForStatement());
case TokenType.Template:
return(ParseTemplateStatement());
case TokenType.OpenTag:
return(ParseCallTemplateStatement());
case TokenType.Text:
TextStatement text = new TextStatement(Current.Data, Current.Line, Current.Column);
Consume();
return(text);
default:
throw new ParserException("Invalid token: " + Current.TokenType.ToString(), Current.Line, Current.Column);
}
}
public bool TryParse(string template, out IList <Statement> result, out IEnumerable <string> errors)
{
errors = Array.Empty <string>();
var segment = new StringSegment(template);
Parser parser = null;
_context = new ParserContext();
result = _context.CurrentBlock.Statements;
try
{
bool trimBefore = false;
bool trimAfter = false;
int previous = 0, index = 0;
Statement s;
while (true)
{
previous = index;
if (!MatchTag(segment, index, out var start, out var end))
{
index = segment.Length;
if (index != previous)
{
// Consume last Text statement
ConsumeTextStatement(segment, previous, index, trimAfter, false);
}
break;
}
else
{
trimBefore = segment.Buffer[start + 2] == '-';
// Only create a parser if there are tags in the template
if (parser == null)
{
parser = new Parser(_languageData);
}
if (start != previous)
{
// Consume current Text statement
ConsumeTextStatement(segment, previous, start, trimAfter, trimBefore);
}
trimAfter = segment.Buffer[end - 2] == '-';
var tag = segment.Substring(start, end - start + 1);
if (trimAfter || trimBefore)
{
// Remove the dashes for the parser
StringBuilder sb = new StringBuilder(tag);
if (trimBefore)
{
sb[2] = ' ';
}
if (trimAfter)
{
sb[end - start - 2] = ' ';
}
tag = sb.ToString();
}
var tree = parser.Parse(tag);
if (tree.HasErrors())
{
int line = 1, col = 1;
foreach (var ch in segment.Buffer.Take(start))
{
switch (ch)
{
case '\n':
line++;
col = 1;
break;
case '\r':
// Ignore
break;
default:
col++;
break;
}
}
errors = tree
.ParserMessages
.Select(x => $"{x.Message} at line:{line + x.Location.Line}, col:{col + x.Location.Column}")
.ToArray();
return(false);
}
switch (tree.Root.Term.Name)
{
case "output":
s = BuildOutputStatement(tree.Root);
break;
case "tag":
s = BuildTagStatement(tree.Root);
break;
default:
s = null;
break;
}
index = end + 1;
// Entered a comment block?
if (_isComment)
{
s = new CommentStatement(ConsumeTag(segment, end + 1, "endcomment", out end));
index = end;
}
// Entered a raw block?
if (_isRaw)
{
s = new TextStatement(ConsumeTag(segment, end + 1, "endraw", out end));
index = end;
}
if (s != null)
{
_context.CurrentBlock.AddStatement(s);
}
}
}