jtr/DevDisciples.Json.Tools/JsonPath.Syntax.cs

using DevDisciples.Parsing;

namespace DevDisciples.Json.Tools;

// See https://docs.hevodata.com/sources/engg-analytics/streaming/rest-api/writing-jsonpath-expressions/

public static partial class JsonPath
{
    public interface IJsonPathSyntax
    {
        public Lexer<JsonPathToken>.Token Token { get; }
    }
    
    public readonly struct WildCardSyntax : IJsonPathSyntax
    {
        public Lexer<JsonPathToken>.Token Token { get; }

        public WildCardSyntax(Lexer<JsonPathToken>.Token token)
        {
            Token = token;
        }
    }

    public readonly struct ArrayIndexSyntax : IJsonPathSyntax
    {
        public Lexer<JsonPathToken>.Token Token { get; }
        public Lexer<JsonPathToken>.Token Index { get; }
        public int IndexAsInt => int.Parse(Token.Lexeme);

        public ArrayIndexSyntax(Lexer<JsonPathToken>.Token token, Lexer<JsonPathToken>.Token index)
        {
            Token = token;
            Index = index;
        }
    }

    public readonly struct ArrayIndexListSyntax : IJsonPathSyntax
    {
        public Lexer<JsonPathToken>.Token Token { get; }
        public Lexer<JsonPathToken>.Token[] Indices { get; }
        public int ValueAt(int index) => int.Parse(Indices[index].Lexeme);

        public ArrayIndexListSyntax(Lexer<JsonPathToken>.Token token, Lexer<JsonPathToken>.Token[] indices)
        {
            Token = token;
            Indices = indices;
        }
    }

    public readonly struct ObjectIndexSyntax : IJsonPathSyntax
    {
        public Lexer<JsonPathToken>.Token Token { get; }
        public Lexer<JsonPathToken>.Token Index { get; }

        public ObjectIndexSyntax(Lexer<JsonPathToken>.Token token, Lexer<JsonPathToken>.Token index)
        {
            Token = token;
            Index = index;
        }
    }

    public readonly struct ObjectIndexListSyntax : IJsonPathSyntax
    {
        public Lexer<JsonPathToken>.Token Token { get; }
        public Lexer<JsonPathToken>.Token[] Indexes { get; }

        public ObjectIndexListSyntax(Lexer<JsonPathToken>.Token token, Lexer<JsonPathToken>.Token[] indexes)
        {
            Token = token;
            Indexes = indexes;
        }
    }

    public readonly struct PropertyAccessorSyntax : IJsonPathSyntax
    {
        public Lexer<JsonPathToken>.Token Token { get; }
        public IJsonPathSyntax Getter { get; }

        public PropertyAccessorSyntax(Lexer<JsonPathToken>.Token token, IJsonPathSyntax getter)
        {
            Token = token;
            Getter = getter;
        }
    }

    public readonly struct PropertySyntax : IJsonPathSyntax
    {
        public Lexer<JsonPathToken>.Token Token { get; }

        public PropertySyntax(Lexer<JsonPathToken>.Token token)
        {
            Token = token;
        }
    }
}