public virtual LessNode VisitSingleValuedExpression(LessParser.SingleValuedExpressionContext context)
{
throw new System.NotImplementedException();
}
private Expression GetSingleValuedExpression(LessParser.SingleValuedExpressionContext context)
{
Expression GetMathOperation()
{
var mathOperation = context.op;
if (mathOperation == null)
{
return(null);
}
var lhs = GetSingleValuedExpression(context.singleValuedExpression(0));
var rhs = GetSingleValuedExpression(context.singleValuedExpression(1));
return(new MathOperation(lhs, mathOperation.Text, rhs, keepSpaces: HasLeadingWhitespace(mathOperation) && HasTrailingWhitespace(mathOperation)));
}
Expression GetColor()
{
var color = context.color();
if (color == null)
{
return(null);
}
var hexColor = color.HexColor();
if (hexColor != null)
{
return(Color.FromHexString(hexColor.GetText()));
}
return(Color.FromKeyword(color.KnownColor().GetText()));
}
Expression GetStringLiteral()
{
return((LessString)context.@string()?.Accept(this));
}
Expression GetBoolean()
{
var boolean = context.booleanValue();
if (boolean == null)
{
return(null);
}
return(new BooleanValue(string.Equals("true", boolean.GetText())));
}
if (context == null)
{
return(null);
}
LessNode result = context.variableName()?.Accept(this)
?? GetColor()
?? context.measurement()?.Accept(this)
?? GetStringLiteral()
?? context.escapeSequence()?.Accept(this)
?? context.function()?.Accept(this)
?? context.unicodeRange()?.Accept(this)
?? context.identifier()?.Accept(this)
?? context.parenthesizedExpression()?.Accept(this)
?? GetMathOperation()
?? context.url()?.Accept(this)
?? context.quotedExpression()?.Accept(this)
?? context.selector()?.Accept(this)
?? GetBoolean()
?? throw new ParserException($"Unexpected expression {context.GetText()}");
return((Expression)result);
}
