using Antlr4.Runtime;
using Antlr4.Runtime.Atn;
using Rubberduck.Parsing.Grammar;

namespace Rubberduck.Parsing.Parsers;

public sealed class VBALikePatternParser
{
    /// <summary>
    /// Parses the given like pattern.
    /// </summary>
    /// <param name="likePattern">The like pattern of the like operation (e.g. in "a Like b" the b)</param>
    /// <returns>The root of the parse tree.</returns>
    public VBALikeParser.LikePatternStringContext Parse(string likePattern)
    {
        var stream = new AntlrInputStream(likePattern);
        var lexer = new VBALikeLexer(stream);
        var tokens = new CommonTokenStream(lexer);
        var parser = new VBALikeParser(tokens);

        VBALikeParser.CompilationUnitContext tree;
        try
        {
            parser.Interpreter.PredictionMode = PredictionMode.Sll;
            tree = parser.compilationUnit();
        }
        catch
        {
            tokens.Reset();
            parser.Reset();
            parser.Interpreter.PredictionMode = PredictionMode.Ll;
            tree = parser.compilationUnit();
        }
        return tree.likePatternString();
    }
}
