wizedispatcher 0.1.3

Runtime dispatch with decorator-based overload registration.

WizeDispatcher

A lightweight, version-robust Python runtime dispatch library with powerful overload registration and type-based selection

✨ Features

• 🎯 Overload Registration via Decorators
  Register multiple implementations for the same function, method, or property setter, with keyword or positional type constraints.

• 📝 Type Hint Overrides
  Overloads can specify types in the decorator to override or partially use type hints from the function signature.

• ⚙ Partial Type Specification
  Missing type constraints in an overload are automatically filled from the fallback/default implementation.

• 📊 Weighted Specificity Scoring
  Runtime match scoring system:

  • 3 → Exact type match
  • 2 → Instance match
  • 1 → Any annotation match
  • 0 → Wildcard match (unspecified param)
  • -1 → No match

• 🛠 Full Typing Support
  Union, Optional, Literal, generic containers (list[int], tuple[int, ...]), and callable detection.

• 📦 Method & Property Support
  Works with instance methods, @classmethod, @staticmethod, and property setters.

• 🚀 Fast Cached Dispatch
  Caches previous matches to speed up repeated calls.

• 🧩 Varargs & Kwargs Handling
  Fully supports *args and **kwargs in overloads, resolving them according to parameter order.

• 🐍 Version Robust
  Works consistently across Python 3.8+ with no dependencies.

🚀 Quick Start

from wizedispatcher import dispatch

# Fallback
def greet(name: object) -> str:
    return f"Hello, {name}!"

# Keyword constraint
@dispatch.greet(name=str)
def _(name: str) -> str:
    return f"Hello, {name}, nice to meet you."

# Positional constraint
@dispatch.greet(str, int)
def _(name, age) -> str:
    return f"{name} is {age} years old"

print(greet("Alice"))   # Hello, Alice, nice to meet you.
print(greet("Bob", 30)) # Bob is 30 years old

📊 Weight-Based Evaluation

WizeDispatcherevaluates overloads with a specificity weight system:

Weight	Meaning
3	Exact type match
2	Instance match
1	Any annotation match
0	Wildcard (unspecified param)
-1	No match (discarded)

Example:
If two overloads match, the one with the higher total weight is chosen.

🧩 Partial Type Specification

# Default function defines all parameters
def process(a: int, b: str, c: float) -> str:
    return "default"

# Overload defines only 'a', inherits 'b' and 'c' types from default
@dispatch.process(a=str)
def _(a: str, b, c) -> str:
    return f"a is str, b is {type(b)}, c is {type(c)}"

🛠 Methods & Properties

class Converter:
    @property
    def value(self) -> int:
        return self._value

    @value.setter
    def value(self, val: object) -> None:
        self._value = val  # fallback setter

    @dispatch.value(value=int)
    def _(self, value: int) -> None:
        self._value = value * 10

    @dispatch.value(value=str)
    def _(self, value: str) -> None:
        self._value = int(value)

c = Converter()
c.value = 3
print(c.value)  # 30
c.value = "7"
print(c.value)  # 7

📦 Installation

pip install wizedispatcher

📚 Documentation

• Wiki: Complete documentation in /wizedispatcher_wiki
• Examples: Ready-to-run demos in /demo

📝 License

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