private StringAstNode ParseString(AstNode?parent)
{
if (_scanner.GetToken() != SyntaxKind.StringLiteral)
{
return(null);
}
var node = new StringAstNode(_scanner.GetTokenOffset(), parent)
{
Value = _scanner.GetValue()
};
return(Finalize(node));
}
private PropertyAstNode?ParseProperty(AstNode?parent, IDictionary <string, AstNode> seen)
{
var node = new PropertyAstNode(_scanner.GetTokenOffset(), parent);
var key = ParseString(node);
if (key == null)
{
if (_scanner.GetToken() == SyntaxKind.Unknown)
{
// Error property key must be double quoted
var keyNode = new StringAstNode(_scanner.GetTokenOffset(), _scanner.GetTokenLength(), node)
{
Value = _scanner.GetValue()
};
key = keyNode;
ScanNext(); // Consume unknown
}
else
{
return(null);
}
}
node.KeyNode = key;
var isSeen = seen.ContainsKey(key.Value);
if (isSeen)
{
// Error duplicate object key
var seenNode = seen[key.Value];
if (seenNode is ObjectAstNode)
{
// Error duplicate object key at position
}
}
else
{
seen[key.Value] = node;
}
if (_scanner.GetToken() == SyntaxKind.ColonToken)
{
node.ColonOffset = _scanner.GetTokenOffset();
ScanNext(); // Consume colon
}
else
{
// Error colon expected
}
var value = ParseValue(node);
if (value == null)
{
// Error value expected
return(null);
}
node.ValueNode = value;
node.Length = value.Offset + value.Length - node.Offset;
return(node);
}