public static StringSegment ParseJsCallExpression(this StringSegment literal, out JsCallExpression expression, bool filterExpression = false)
{
literal = literal.ParseIdentifier(out var token);
if (!(token is JsIdentifier identifier))
{
throw new SyntaxErrorException($"Expected identifier but instead found '{token}'");
}
literal = literal.AdvancePastWhitespace();
if (literal.IsNullOrEmpty() || literal.GetChar(0) != '(')
{
var isWhitespaceSyntax = filterExpression && literal.GetChar(0) == ':';
if (isWhitespaceSyntax)
{
literal = literal.Advance(1);
// replace everything after ':' up till new line and rewrite as single string to method
var endStringPos = literal.IndexOf("\n");
var endStatementPos = literal.IndexOf("}}");
if (endStringPos == -1 || (endStatementPos != -1 && endStatementPos < endStringPos))
{
endStringPos = endStatementPos;
}
if (endStringPos == -1)
{
throw new SyntaxErrorException($"Whitespace sensitive syntax did not find a '\\n' new line to mark the end of the statement, near '{literal.SubstringWithElipsis(0,50)}'");
}
var originalArg = literal.Subsegment(0, endStringPos).Trim().ToString();
var rewrittenArgs = originalArg.Replace("{", "{{").Replace("}", "}}");
var strArg = new JsLiteral(rewrittenArgs);
expression = new JsCallExpression(identifier, strArg);
return(literal.Subsegment(endStringPos));
}
expression = new JsCallExpression(identifier);
return(literal);
}
literal.Advance(1);
literal = literal.ParseArguments(out var args, termination: ')');
expression = new JsCallExpression(identifier, args.ToArray());
return(literal);
}
public static ReadOnlySpan <char> ParseJsCallExpression(this ReadOnlySpan <char> literal, out JsCallExpression expression, bool filterExpression = false)
{
literal = literal.ParseIdentifier(out var token);
if (!(token is JsIdentifier identifier))
{
throw new SyntaxErrorException($"Expected identifier but instead found {token.DebugToken()}");
}
literal = literal.AdvancePastWhitespace();
if (literal.FirstCharEquals(WhitespaceArgument))
{
literal = literal.Advance(1);
literal = literal.ParseWhitespaceArgument(out var argument);
expression = new JsCallExpression(identifier, argument);
return(literal);
}
if (literal.StartsWith("=>"))
{
literal = literal.ParseArrowExpressionBody(new[] { new JsIdentifier("it") }, out var arrowExpr);
expression = new JsCallExpression(identifier, arrowExpr);
return(literal);
}
if (!literal.FirstCharEquals('('))
{
expression = new JsCallExpression(identifier);
return(literal);
}
literal = literal.Advance(1);
literal = literal.ParseArguments(out var args, termination: ')');
expression = new JsCallExpression(identifier, args.ToArray());
return(literal);
}
