extending

Scriptling Extension Examples

This directory contains a comprehensive example of how to extend Scriptling with custom functions and libraries written in Go.

main.go

A complete example demonstrating:

• Custom Functions: Registering individual functions with RegisterFunc()
• Custom Libraries: Creating and registering libraries with RegisterLibrary()
• Argument Handling: Accepting and validating function arguments
• Return Values: Returning different types of results
• Type Casting: Converting between Scriptling object types (Integer, Float, String, List, Dict)
• Arrays: Processing Scriptling lists/arrays
• Maps: Working with Scriptling dictionaries/maps

Features Demonstrated

1. Simple Function: greet(name) - Takes a string, returns a greeting
2. Array Processing: process_numbers(numbers) - Takes an array of numbers, returns processed strings
3. Library Functions:
   • mathutils.power(base, exp) - Calculates power with type casting
   • mathutils.sum_array(numbers) - Sums all numbers in an array
   • mathutils.get_map_value(map, key) - Retrieves values from dictionaries
   • mathutils.create_person(name, age) - Creates and returns a person dictionary

Running the Example

cd examples/extending
go run .

This will execute a comprehensive Scriptling script that demonstrates all the extension features.

Key Concepts

Function Signature

All Scriptling functions must follow this signature:

func(ctx context.Context, kwargs object.Kwargs, args ...object.Object) object.Object

Type System

Scriptling objects include:

• *object.String - String values
• *object.Integer - Integer values
• *object.Float - Float values
• *object.Boolean - Boolean values
• *object.List - Lists/arrays
• *object.Dict - Dictionaries

Error Handling

Return error messages as strings:

return object.NewString("Error: invalid argument")

Registration

• Functions: p.RegisterFunc(name, function)
• Libraries: p.RegisterLibrary(library) (name is extracted from library)

Advanced Topics

For more advanced examples including:

• Output capture for logging
• State management in libraries
• Database integration
• HTTP clients
• Testing custom extensions

See the Go Integration documentation at scriptling.dev.