private void ParseStart(PreTokenEnumerator enumerator, ref FlatTokenParserState state)
{
var peek = enumerator.Peek(4);
if (peek == "---\n")
{
state = FlatTokenParserState.InFrontMatter;
enumerator.Next(4);
return;
}
peek = enumerator.Peek(5);
if (peek == "---\r\n")
{
state = FlatTokenParserState.InFrontMatter;
enumerator.Next(4); // Next() will trim /r/n
return;
}
state = FlatTokenParserState.InPreamble;
}
private void ParseFrontMatter(PreTokenEnumerator enumerator, ref StringBuilder frontMatterName, ref FlatTokenParserState state)
{
var peek = enumerator.Peek(4);
if (peek == "---\n")
{
state = FlatTokenParserState.InPreamble;
enumerator.Next(4);
return;
}
peek = enumerator.Peek(5);
if (peek == "---\r\n")
{
state = FlatTokenParserState.InPreamble;
enumerator.Next(5);
return;
}
var next = enumerator.Next();
switch (next)
{
case "#":
state = FlatTokenParserState.InFrontMatterComment;
break;
case "\n":
case "\r":
break;
default:
state = FlatTokenParserState.InFrontMatterOption;
frontMatterName.Append(next);
break;
}
}
private void ParsePreamble(ref PreToken token, PreTokenEnumerator enumerator, ref FlatTokenParserState state, ref StringBuilder tokenContent)
{
var next = enumerator.Next();
switch (next)
{
case "{":
if (enumerator.Peek() == "{")
{
token.AppendPreamble("{");
enumerator.Next();
}
else
{
token.Location = enumerator.Location.Clone();
tokenContent.Append("{");
state = FlatTokenParserState.InTokenName;
}
break;
case "}":
if (enumerator.Peek() == "}")
{
token.AppendPreamble("}");
enumerator.Next();
break;
}
throw new ParsingException($"Unescaped character '}}' in template.", enumerator);
default:
token.AppendPreamble(next);
break;
}
}
private void ParseTokenValue(PreTemplate template, ref PreToken token, PreTokenEnumerator enumerator, ref FlatTokenParserState state, ref bool inFrontMatterToken, ref StringBuilder tokenContent, TokenizerOptions options)
{
var next = enumerator.Next();
var peek = enumerator.Peek();
tokenContent.Append(next);
switch (next)
{
case "{":
throw new ParsingException($"Unexpected character '{{' in token '{token.Name}'", enumerator);
case "}" when inFrontMatterToken == false:
case "\n" when inFrontMatterToken:
token.IsFrontMatterToken = inFrontMatterToken;
AppendToken(template, token, ref tokenContent, options);
token = new PreToken();
if (inFrontMatterToken)
{
inFrontMatterToken = false;
state = FlatTokenParserState.InFrontMatter;
}
else
{
state = FlatTokenParserState.InPreamble;
}
break;
case ":":
state = FlatTokenParserState.InDecorator;
break;
case "'":
state = FlatTokenParserState.InTokenValueSingleQuotes;
break;
case "\"":
state = FlatTokenParserState.InTokenValueDoubleQuotes;
break;
case " ":
switch (peek)
{
case " ":
case "}" when inFrontMatterToken == false:
case "\n" when inFrontMatterToken:
case ":":
break;
default:
if (token.HasValue)
{
throw new ParsingException($"Invalid character '{peek}' in token '{token.Name}'", enumerator);
}
break;
}
break;
case "}" when inFrontMatterToken:
case "\n" when inFrontMatterToken == false:
throw new ParsingException($"'{token.Name}' unexpected character: {next}", enumerator);
default:
token.AppendValue(next);
break;
}
}
private void ParseTokenName(PreTemplate template, ref PreToken token, PreTokenEnumerator enumerator, ref FlatTokenParserState state, ref bool inFrontMatterToken, ref StringBuilder tokenContent, TokenizerOptions options)
{
var next = enumerator.Next();
var peek = enumerator.Peek();
tokenContent.Append(next);
switch (next)
{
case "{":
throw new ParsingException($"Unexpected character '{{' in token '{token.Name}'", enumerator);
case "}":
if (inFrontMatterToken)
{
throw new ParsingException($"Invalid character '{next}' in token '{token.Name}'", enumerator);
}
else
{
AppendToken(template, token, ref tokenContent, options);
token = new PreToken();
state = FlatTokenParserState.InPreamble;
}
break;
case "$":
token.TerminateOnNewline = true;
switch (peek)
{
case " ":
case "?":
case "*":
case "}":
case ":":
case "!":
break;
default:
throw new ParsingException($"Invalid character '{peek}' in token '{token.Name}'", enumerator);
}
break;
case "?":
token.Optional = true;
switch (peek)
{
case " ":
case "$":
case "*":
case "}":
case ":":
case "!":
break;
default:
throw new ParsingException($"Invalid character '{peek}' in token '{token.Name}'", enumerator);
}
if (token.Required)
{
throw new ParsingException($"Required token {token.Name} can't be Optional", enumerator);
}
break;
case "*":
token.Repeating = true;
token.Optional = true;
switch (peek)
{
case " ":
case "$":
case "?":
case "}":
case ":":
case "!":
break;
default:
throw new ParsingException($"Invalid character '{peek}' in token '{token.Name}'", enumerator);
}
break;
case "!":
token.Required = true;
switch (peek)
{
case " ":
case "*":
case "$":
case "?":
case "}":
case ":":
break;
default:
throw new ParsingException($"Invalid character '{peek}' in token '{token.Name}'", enumerator);
}
if (token.Optional)
{
throw new ParsingException($"Optional token {token.Name} can't be Required", enumerator);
}
break;
case ":":
state = FlatTokenParserState.InDecorator;
break;
case "=":
state = FlatTokenParserState.InTokenValue;
break;
case " ":
switch (peek)
{
case " ":
case "*":
case "$":
case "?":
case "}":
case ":":
case "!":
case "=":
break;
case "\n" when inFrontMatterToken:
break;
default:
if (string.IsNullOrWhiteSpace(token.Name) == false)
{
throw new ParsingException($"Invalid character '{peek}' in token '{token.Name}'", enumerator);
}
break;
}
break;
case "\n":
if (inFrontMatterToken)
{
token.IsFrontMatterToken = true;
AppendToken(template, token, ref tokenContent, options);
token = new PreToken();
inFrontMatterToken = false;
state = FlatTokenParserState.InFrontMatter;
}
else
{
throw new ParsingException($"Invalid character '{next}' in token '{token.Name}'", enumerator);
}
break;
default:
if (ValidTokenNameCharacters.Contains(next))
{
token.AppendName(next);
}
else
{
throw new ParsingException($"Invalid character '{next}' in token '{token.Name}'", enumerator);
}
break;
}
}