public static bool TryParseNode(IParser parser, out LayoutNode node)
{
bool result = false;
node = null;
if (parser.PeekToken(TokenKind.LayoutKeyword))
{
result = true;
node = new LayoutNode();
parser.NextToken();
node.StartIndex = parser.Token.Span.Start;
if (parser.PeekToken(TokenKind.LeftParenthesis))
{
parser.NextToken();
LayoutAttribute attrib;
while (LayoutAttribute.TryParseAttribute(parser, out attrib))
{
node.Attributes.Add(attrib);
if (!parser.PeekToken(TokenKind.Comma))
{
break;
}
else
{
parser.NextToken();
}
}
if (parser.PeekToken(TokenKind.RightParenthesis))
{
parser.NextToken();
}
else
{
parser.ReportSyntaxError("Expected right-paren.");
}
}
node.EndIndex = parser.Token.Span.End;
}
return(result);
}
public static bool TryParseAttribute(IParser parser, out LayoutAttribute attrib)
{
attrib = new LayoutAttribute();
bool result = true;
int?intVal = null;
StringExpressionNode stringNode = null;
switch (parser.PeekToken().Kind)
{
case TokenKind.ImageKeyword:
parser.NextToken();
attrib.StartIndex = parser.Token.Span.Start;
attrib.Type = LayoutAttributes.Image;
if (StringExpressionNode.TryGetExpressionNode(parser, out stringNode))
{
attrib.Image = stringNode;
}
else
{
parser.ReportSyntaxError("Invalid token found in Image attribute, expected string literal.");
}
break;
case TokenKind.MinHeightKeyword:
parser.NextToken();
attrib.StartIndex = parser.Token.Span.Start;
attrib.Type = LayoutAttributes.MinHeight;
intVal = GetIntegerValue(parser);
if (intVal.HasValue)
{
attrib.MinHeight = intVal.Value;
}
break;
case TokenKind.MinWidthKeyword:
parser.NextToken();
attrib.StartIndex = parser.Token.Span.Start;
attrib.Type = LayoutAttributes.MinWidth;
intVal = GetIntegerValue(parser);
if (intVal.HasValue)
{
attrib.MinWidth = intVal.Value;
}
break;
case TokenKind.SpacingKeyword:
parser.NextToken();
attrib.StartIndex = parser.Token.Span.Start;
attrib.Type = LayoutAttributes.Spacing;
if (parser.PeekToken(TokenKind.NormalKeyword))
{
parser.NextToken();
attrib.Spacing = LayoutSpacing.Normal;
}
else if (parser.PeekToken(TokenKind.CompactKeyword))
{
parser.NextToken();
attrib.Spacing = LayoutSpacing.Compact;
}
else
{
parser.ReportSyntaxError("Invalid token found in Spacing attribute, expected \"NORMAL\" or \"COMPACT\".");
}
break;
case TokenKind.StyleKeyword:
parser.NextToken();
attrib.StartIndex = parser.Token.Span.Start;
attrib.Type = LayoutAttributes.Style;
if (StringExpressionNode.TryGetExpressionNode(parser, out stringNode))
{
attrib.Style = stringNode;
}
else
{
parser.ReportSyntaxError("Invalid token found in Style attribute, expected string literal.");
}
break;
case TokenKind.TextKeyword:
parser.NextToken();
attrib.StartIndex = parser.Token.Span.Start;
attrib.Type = LayoutAttributes.Text;
if (StringExpressionNode.TryGetExpressionNode(parser, out stringNode))
{
attrib.Text = stringNode;
}
else
{
parser.ReportSyntaxError("Invalid token found in Text attribute, expected string literal.");
}
break;
case TokenKind.TagKeyword:
parser.NextToken();
attrib.StartIndex = parser.Token.Span.Start;
attrib.Type = LayoutAttributes.Tag;
if (StringExpressionNode.TryGetExpressionNode(parser, out stringNode))
{
attrib.Tag = stringNode;
}
else
{
parser.ReportSyntaxError("Invalid token found in Tag attribute, expected string literal.");
}
break;
case TokenKind.VersionKeyword:
parser.NextToken();
attrib.StartIndex = parser.Token.Span.Start;
attrib.Type = LayoutAttributes.Version;
if (StringExpressionNode.TryGetExpressionNode(parser, out stringNode))
{
attrib.Version = stringNode;
}
else
{
parser.ReportSyntaxError("Invalid token found in Version attribute, expected string literal.");
}
break;
case TokenKind.WindowStyleKeyword:
parser.NextToken();
attrib.StartIndex = parser.Token.Span.Start;
attrib.Type = LayoutAttributes.WindowStyle;
if (StringExpressionNode.TryGetExpressionNode(parser, out stringNode))
{
attrib.WindowStyle = stringNode;
}
else
{
parser.ReportSyntaxError("Invalid token found in WindowStyle attribute, expected string literal.");
}
break;
default:
result = false;
attrib = null;
break;
}
if (attrib != null)
{
attrib.EndIndex = parser.Token.Span.End;
}
return(result);
}