BadExportExpressionParser.cs

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using BadScript2.Common;
using BadScript2.Parser.Expressions;
using BadScript2.Parser.Expressions.Binary;
using BadScript2.Parser.Expressions.Module;
using BadScript2.Reader;
using BadScript2.Runtime.Error;
 
namespace BadScript2.Parser.Operators.Module;
 
public class BadExportExpressionParser : BadValueParser
{
    public override bool IsValue(BadSourceParser parser)
    {
        return parser.Reader.IsKey(BadStaticKeys.EXPORT_KEY);
    }
 
    public static bool IsNamed(BadExpression expr, out string? name)
    {
        if (expr is IBadNamedExpression namedExpr)
        {
            name = namedExpr.GetName();
 
            return true;
        }
 
        if (expr is BadAssignExpression assign)
        {
            if (assign.Left is IBadNamedExpression named)
            {
                name = named.GetName();
 
                return true;
            }
        }
 
        name = null;
 
        return false;
    }
 
    public override BadExpression ParseValue(BadSourceParser parser)
    {
        BadSourcePosition pos = parser.Reader.Eat(BadStaticKeys.EXPORT_KEY);
        parser.Reader.SkipNonToken();
        bool isDefault = parser.Reader.IsKey(BadStaticKeys.DEFAULT_KEY);
        if (isDefault)
        {
            parser.Reader.Eat(BadStaticKeys.DEFAULT_KEY);
            parser.Reader.SkipNonToken();
        }
 
        BadExpression expr = parser.ParseExpression();
 
        bool isNamed = IsNamed(expr, out string? name);
 
        if (!isDefault && isNamed)
        {
            return new BadNamedExportExpression(name, expr, pos.Combine(expr.Position));
        }
 
        if (isDefault && !isNamed)
        {
            throw new BadRuntimeException("Default Export must be a named expression", pos);
        }
 
        return new BadDefaultExportExpression(expr, pos.Combine(expr.Position));
    }
}