/// <summary>
/// Evaluate object[index]
/// </summary>
/// <returns></returns>
public override object DoEvaluate()
{
var ndxVal = IndexExp.Evaluate();
this.ListObject = VariableExp.Evaluate();
// Check for empty objects.
ExceptionHelper.NotNull(this, this.ListObject, "indexing");
ExceptionHelper.NotNull(this, ndxVal, "indexing");
var lobj = (LObject)this.ListObject;
// CASE 1. Access
// e.g. Array: users[0]
// e.g. Map: users['total']
if (!this.IsAssignment)
{
var result = EvalHelper.AccessIndex(this.Ctx.Methods, this, lobj, (LObject)ndxVal);
return(result);
}
// CASE 2. Assignment
// e.g. Array: users[0] = 'john'
// e.g. Map: users['total'] = 200
// NOTE: In this case of assignment, return back a MemberAccess object descripting what is assign
var indexAccess = new IndexAccess();
indexAccess.Instance = lobj;
indexAccess.MemberName = (LObject)ndxVal;
return(indexAccess);
}
/// <summary>
/// Evaluate object[index]
/// </summary>
/// <returns></returns>
public static object EvalIndexAccess(IndexExpr expr)
{
var ndxVal = expr.IndexExp.Evaluate();
var listObject = expr.VariableExp.Evaluate();
// Check for empty objects.
ExceptionHelper.NotNull(expr, listObject, "indexing");
ExceptionHelper.NotNull(expr, ndxVal, "indexing");
var lobj = (LObject)listObject;
// CASE 1. Access
// e.g. Array: users[0]
// e.g. Map: users['total']
if (!expr.IsAssignment)
{
var result = EvalHelper.AccessIndex(Ctx.Methods, expr, lobj, (LObject)ndxVal);
return result;
}
// CASE 2. Assignment
// e.g. Array: users[0] = 'john'
// e.g. Map: users['total'] = 200
// NOTE: In this case of assignment, return back a MemberAccess object descripting what is assign
var indexAccess = new IndexAccess();
indexAccess.Instance = lobj;
indexAccess.MemberName = (LObject)ndxVal;
return indexAccess;
}