InScript - Lightweight Scripting for Unity

A lightweight, designer-friendly scripting system for Unity. Define game logic using a simple custom syntax with real-time syntax highlighting in the Inspector.

✨ Features

• 📝 Simple Syntax - Easy-to-learn DSL designed for game designers
• 🎨 Syntax Highlighting - Real-time colored preview in the Unity Inspector
• 🔢 Line Numbers - Visual Studio-like line number gutter
• 🎯 Attribute-Based Binding - Connect scripts to your code with simple attributes
• 📦 Inline or Asset - Use scripts embedded in components or as reusable ScriptableObjects
• ✅ Live Validation - Instant error detection as you type
• 🔧 Zero Dependencies - Pure C#, no external libraries required

📦 Installation

Via Git URL (Package Manager)

1. Open Package Manager in Unity (Window > Package Manager)
2. Click the + button and select Add package from git URL...
3. Enter the following URL:

https://github.com/xavierarpa/InScript.git

Manual Installation

1. Download or clone this repository
2. Copy the InScript folder into your Assets/Plugins folder

🚀 Quick Start

1. Create a Script Context

Add attributes to expose fields and methods to scripts:

using UnityEngine;
using InScript;

public class Character : MonoBehaviour
{
    [SerializeField, InScript] private float hp = 100;
    [SerializeField, InScript] private float maxHp = 100;
    [SerializeField, InScript] private float attack = 10;
    
    [SerializeField, InScript("Target")] private Character target;
    
    [InScript]
    private void Heal(float amount)
    {
        hp = Mathf.Min(hp + amount, maxHp);
    }
    
    [InScript]
    private void Log(string message, float value)
    {
        Debug.Log($"{message}: {value}");
    }
}

2. Write a Script

Create a ScriptAsset or use an inline Script field:

@main
    $damage = attack * 1.5
    
    ? hp < maxHp * 0.5
        Log("Low HP!", hp)
        Heal(20)
    ;
    
    #Target.TakeDamage($damage)
;

3. Execute

[SerializeField] private Script script;

void Start()
{
    script.ExecuteBlock("main", this);
}

📖 Syntax Reference

Blocks

@blockName          // Start a named block
    // code here
;                   // End block

Variables

$localVar = 10              // Local variable (script scope)
$localVar += 5              // Compound assignment (+=, -=, *=, /=)
contextVar = value          // Context variable (from your code)

Selectors

#Target.hp                  // Access selector property
#Target.TakeDamage(10)      // Call selector method

Conditionals

? condition                 // If
    // code
:? otherCondition           // Else if
    // code
:                           // Else
    // code
;                           // End if

Built-in Functions

Math Functions

Function	Description	Example
min(a, b)	Returns the smaller of two values	min(hp, maxHp) → 50 if hp=50, maxHp=100
max(a, b)	Returns the larger of two values	max(0, damage - armor) → prevents negative
clamp(value, min, max)	Constrains a value between min and max	clamp(hp, 0, maxHp) → keeps hp in valid range
abs(x)	Returns the absolute (positive) value	abs(-5) → 5
sign(x)	Returns -1, 0, or 1 based on sign	sign(-10) → -1

Rounding Functions

Function	Description	Example
floor(x)	Rounds down to nearest integer	floor(3.7) → 3
ceil(x)	Rounds up to nearest integer	ceil(3.2) → 4
round(x)	Rounds to nearest integer	round(3.5) → 4

Advanced Functions

Function	Description	Example
sqrt(x)	Square root	sqrt(16) → 4
pow(base, exp)	Power/exponent	pow(2, 3) → 8
lerp(a, b, t)	Linear interpolation between a and b	lerp(0, 100, 0.5) → 50
random(min, max)	Random float between min and max	random(1, 10) → 5.7 (varies)
random()	Random float between 0 and 1	random() → 0.42 (varies)

Operators

Type	Operators
Arithmetic	+ - * /
Comparison	== != < > <= >=

🏗️ Architecture

InScript/
├── Runtime/
│   ├── Script.cs              # Serializable script container
│   ├── ScriptAsset.cs         # ScriptableObject wrapper
│   ├── ScriptRunner.cs        # Script execution engine
│   ├── IScriptContext.cs      # Context interface
│   ├── ReflectionContext.cs   # Attribute-based context
│   └── Attributes/
│       └── InScriptAttribute.cs # Unified attribute for values/selectors/methods
└── Editor/
    ├── ScriptDrawer.cs           # PropertyDrawer with syntax highlighting
    ├── ScriptAssetEditor.cs      # Custom editor for ScriptAsset
    ├── ScriptDebugWindow.cs      # Debug panel for testing scripts
    └── SyntaxReferenceWindow.cs  # Dockable syntax documentation

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🤝 Contributing

Contributions are welcome! Please read CONTRIBUTING.md for details.

👤 Author

Xavier Arpa - @xavierarpa