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using Unity.VisualScripting.Dependencies.NCalc;
using UnityEngine;
using NCalc = Unity.VisualScripting.Dependencies.NCalc.Expression;
namespace Unity.VisualScripting
{
/// <summary>
/// Evaluates a mathematical or logical formula with multiple arguments.
/// </summary>
public sealed class Formula : MultiInputUnit<object>
{
[SerializeAs(nameof(Formula))]
private string _formula;
private NCalc ncalc;
/// <summary>
/// A mathematical or logical expression tree.
/// </summary>
[DoNotSerialize]
[Inspectable, UnitHeaderInspectable]
[InspectorTextArea]
public string formula
{
get => _formula;
set
{
_formula = value;
InitializeNCalc();
}
}
/// <summary>
/// Whether input arguments should only be fetched once and then reused.
/// </summary>
[Serialize]
[Inspectable(order = int.MaxValue)]
[InspectorExpandTooltip]
public bool cacheArguments { get; set; }
/// <summary>
/// The result of the calculation or evaluation.
/// </summary>
[DoNotSerialize]
[PortLabelHidden]
public ValueOutput result { get; private set; }
protected override int minInputCount => 0;
protected override void Definition()
{
base.Definition();
result = ValueOutput(nameof(result), Evaluate);
InputsAllowNull();
foreach (var input in multiInputs)
{
Requirement(input, result);
}
InitializeNCalc();
}
private void InitializeNCalc()
{
if (string.IsNullOrEmpty(formula))
{
ncalc = null;
return;
}
ncalc = new NCalc(formula);
ncalc.Options = EvaluateOptions.IgnoreCase;
ncalc.EvaluateParameter += EvaluateTreeParameter;
ncalc.EvaluateFunction += EvaluateTreeFunction;
}
private object Evaluate(Flow flow)
{
if (ncalc == null)
{
throw new InvalidOperationException("No formula provided.");
}
ncalc.UpdateUnityTimeParameters();
return ncalc.Evaluate(flow);
}
private void EvaluateTreeFunction(Flow flow, string name, FunctionArgs args)
{
if (name == "v2" || name == "V2")
{
if (args.Parameters.Length != 2)
{
throw new ArgumentException($"v2() takes at exactly 2 arguments. {args.Parameters.Length} provided.");
}
args.Result = new Vector2
(
ConversionUtility.Convert<float>(args.Parameters[0].Evaluate(flow)),
ConversionUtility.Convert<float>(args.Parameters[1].Evaluate(flow))
);
}
else if (name == "v3" || name == "V3")
{
if (args.Parameters.Length != 3)
{
throw new ArgumentException($"v3() takes at exactly 3 arguments. {args.Parameters.Length} provided.");
}
args.Result = new Vector3
(
ConversionUtility.Convert<float>(args.Parameters[0].Evaluate(flow)),
ConversionUtility.Convert<float>(args.Parameters[1].Evaluate(flow)),
ConversionUtility.Convert<float>(args.Parameters[2].Evaluate(flow))
);
}
else if (name == "v4" || name == "V4")
{
if (args.Parameters.Length != 4)
{
throw new ArgumentException($"v4() takes at exactly 4 arguments. {args.Parameters.Length} provided.");
}
args.Result = new Vector4
(
ConversionUtility.Convert<float>(args.Parameters[0].Evaluate(flow)),
ConversionUtility.Convert<float>(args.Parameters[1].Evaluate(flow)),
ConversionUtility.Convert<float>(args.Parameters[2].Evaluate(flow)),
ConversionUtility.Convert<float>(args.Parameters[3].Evaluate(flow))
);
}
}
public object GetParameterValue(Flow flow, string name)
{
if (name.Length == 1)
{
var character = name[0];
if (char.IsLetter(character))
{
character = char.ToLower(character);
var index = GetArgumentIndex(character);
if (index < multiInputs.Count)
{
var input = multiInputs[index];
if (cacheArguments && !flow.IsLocal(input))
{
flow.SetValue(input, flow.GetValue<object>(input));
}
return flow.GetValue<object>(input);
}
}
}
else
{
if (Variables.Graph(flow.stack).IsDefined(name))
{
return Variables.Graph(flow.stack).Get(name);
}
var self = flow.stack.self;
if (self != null)
{
if (Variables.Object(self).IsDefined(name))
{
return Variables.Object(self).Get(name);
}
}
var scene = flow.stack.scene;
if (scene != null)
{
if (Variables.Scene(scene).IsDefined(name))
{
return Variables.Scene(scene).Get(name);
}
}
if (Variables.Application.IsDefined(name))
{
return Variables.Application.Get(name);
}
if (Variables.Saved.IsDefined(name))
{
return Variables.Saved.Get(name);
}
}
throw new InvalidOperationException($"Unknown expression tree parameter: '{name}'.\nSupported parameter names are alphabetical indices and variable names.");
}
private void EvaluateTreeParameter(Flow flow, string name, ParameterArgs args)
{
// [param.fieldOrProperty]
// [param.parmeterLessMethod()]
if (name.Contains("."))
{
var parts = name.Split('.');
if (parts.Length == 2)
{
var parameterName = parts[0];
var memberName = parts[1].TrimEnd("()");
var variableValue = GetParameterValue(flow, parameterName);
var manipulator = new Member(variableValue.GetType(), memberName, Type.EmptyTypes);
var target = variableValue;
if (manipulator.isInvocable)
{
args.Result = manipulator.Invoke(target);
}
else if (manipulator.isGettable)
{
args.Result = manipulator.Get(target);
}
else
{
throw new InvalidOperationException($"Cannot get or invoke expression tree parameter: [{parameterName}.{memberName}]");
}
}
else
{
throw new InvalidOperationException($"Cannot parse expression tree parameter: [{name}]");
}
}
else
{
args.Result = GetParameterValue(flow, name);
}
}
public static string GetArgumentName(int index)
{
if (index > ('z' - 'a'))
{
throw new NotImplementedException("Argument indices above 26 are not yet supported.");
}
return ((char)('a' + index)).ToString();
}
public static int GetArgumentIndex(char name)
{
if (name < 'a' || name > 'z')
{
throw new NotImplementedException("Unalphabetical argument names are not yet supported.");
}
return name - 'a';
}
}
}
|