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using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
using Newtonsoft.Json;
namespace Firebase.Database.Offline.Internals
{
public class MemberAccessVisitor : ExpressionVisitor
{
private readonly IList<string> propertyNames = new List<string>();
private bool wasDictionaryAccess;
public IEnumerable<string> PropertyNames => propertyNames;
public override Expression Visit(Expression expr)
{
if (expr?.NodeType == ExpressionType.MemberAccess)
{
if (wasDictionaryAccess)
{
wasDictionaryAccess = false;
}
else
{
var memberExpr = (MemberExpression) expr;
var jsonAttr = memberExpr.Member.GetCustomAttribute<JsonPropertyAttribute>();
propertyNames.Add(jsonAttr?.PropertyName ?? memberExpr.Member.Name);
}
}
else if (expr?.NodeType == ExpressionType.Call)
{
var callExpr = (MethodCallExpression) expr;
if (callExpr.Method.Name == "get_Item" && callExpr.Arguments.Count == 1)
{
var e = Expression.Lambda(callExpr.Arguments[0]).Compile();
propertyNames.Add(e.DynamicInvoke().ToString());
wasDictionaryAccess = callExpr.Arguments[0].NodeType == ExpressionType.MemberAccess;
}
}
return base.Visit(expr);
}
}
}
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