Hacking In Python's Parameter Definition!
Project description
# magic-constraints
[![PyPI](https://img.shields.io/pypi/pyversions/magic_constraints.svg)](https://pypi.python.org/pypi/magic_constraints) [![Build
Status](https://travis-ci.org/huntzhan/magic-constraints.svg?branch=master)](https://travis-ci.org/huntzhan/magic-constraints)
[![Coverage Status](https://coveralls.io/repos/github/huntzhan/magic-constraints/badge.svg?branch=master)](https://coveralls.io/github/huntzhan/magic-constraints?branch=master)
## Introduction
**v0.2 is not released yet. This document is UNSTABLE!!!!!!! Might change a lot in the future.**
`magic-constraints` supports:
1. [type introspection][2] on "specialized" [abstract base classes][1] (kind of).
2. declaration and dynamic chekcing on the parameters of function/method.
[1]: https://docs.python.org/3/glossary.html#term-abstract-base-class
[2]: https://en.wikipedia.org/wiki/Type_introspection
## Quick Start
### Install
```
pip install magic-constraints
```
### Abstract Base Classes Introspection:
`magic-constraints` implemented a few ABCs for type introspection.
Details will be presented in the next section. Example:
```python
from magic_constraints import Sequence, MutableSequence, ImmutableSequence
# True.
isinstance([1, 2, 3], Sequence)
# True.
isinstance([1, 2, 3], MutableSequence)
# True.
isinstance((1, 2, 3), ImmutableSequence)
# True, Sequence with int.
isinstance([1, 2, 3], Sequence[int])
# False, 2.0 is float.
isinstance([1, 2.0, 3], Sequence[int])
# True.
isinstance([(1, 2), (3, 4)], Sequence[ImmutableSequence[int]])
# False, 3.0 is float.
isinstance([(1, 2), (3.0, 4)], Sequence[ImmutableSequence[int]])
# False, [3, 4] is MutableSequence.
isinstance([(1, 2), [3, 4]], Sequence[ImmutableSequence[int]])
# more avaliable ABCs.
from magic_constraints import (
Sequence,
MutableSequence,
ImmutableSequence,
Set,
MutableSet,
ImmutableSet,
Mapping,
MutableMapping,
ImmutableMapping,
Iterable,
Iterator,
Any,
Union,
)
```
Declaration on function parameters:
```python
from magic_constraints import function_constraints, Parameter, Sequence
@function_constraints(
str, Sequence[int],
)
def func_foo(foo, bar):
return {foo: bar}
@function_constraints(
Parameter('foo', str),
Parameter('bar', Sequence[int], nullable=True, default=[1, 2, 3]),
pass_by_compound=True,
)
def func_bar(args):
return {args.foo: args.bar}
# more decorators.
from magic_constraints.decorator import (
function_constraints,
method_constraints,
class_initialization_constraints,
)
```
Parameter checking:
```python
>>> func_foo('ok', [1, 2, 3])
{'ok': [1, 2, 3]}
>>> func_foo('ops', 42)
Traceback (most recent call last):
...
magic_constraints.exception.MagicTypeError:
MagicTypeError: argument unmatched.
-----------------------------------
argument: 42
parameter: Parameter(name='bar', type_=Sequence[int])
-----------------------------------
>>> func_foo('ops', None)
Traceback (most recent call last):
...
magic_constraints.exception.MagicTypeError:
MagicTypeError: argument unmatched.
-----------------------------------
argument: None
parameter: Parameter(name='bar', type_=Sequence[int])
-----------------------------------
>>>
>>>
>>> func_bar('ops')
{'ops': [1, 2, 3]}
>>> func_bar('ops', None)
{'ops': None}
>>> func_bar('ok', [2, 3, 4])
{'ok': [2, 3, 4]}
>>> func_bar('ops', 42)
Traceback (most recent call last):
...
MagicTypeError: argument unmatched.
-----------------------------------
argument: 42
parameter: Parameter(name='bar', type_=Sequence[int], default=[1, 2, 3], nullable=True)
-----------------------------------
```
## `magic_constrains.types`
Supported ABCs and avaliable specialization of ABCs:
```
type ::= abc
| speical
| <any other type object>
abc ::= sequence
| set
| mapping
| iterable
| iterator
sequence ::= Sequence
| Sequence [ type ]
| Sequence [ type, ... ]
| MutableSequence
| MutableSequence [ type ]
| MutableSequence [ type, ... ]
| ImmutableSequence
| ImmutableSequence [ type ]
| ImmutableSequence [ type, ... ]
set ::= Set
| Set [ type ]
| MutableSet
| MutableSet [ type ]
| ImmutableSet
| ImmutableSet [ type ]
mapping ::= Mapping
| Mapping [ type, type ]
| MutableMapping
| MutableMapping [ type, type ]
| ImmutableMapping
| ImmutableMapping [ type, type ]
iterable ::= Iterable
| Iterable [ type ]
| Iterable [ type, ... ]
iterator ::= Iterator
| Iterator [ type ]
| Iterator [ type, ... ]
speical ::= Any
| Union [ type, ... ]
```
Explanations are as follow.
`type` means type object in Python. `abc` defines several supported ABCs. `speical` defines some type objects for some spectial purposes.
`sequence`:
* `Sequence` is equivalent to [collections.abc.Sequence][3]. `MutableSequence` is equivalent to [collections.abc.MutableSequence][4]. `ImmutableSequence` is a `Sequence` that is not a `MutableSequence`.
* `Sequence[ type ]` specializes `Sequence`, accepting a sequence with instances of `type`.
* `Sequence[ type, ... ]` specialized `Sequence`, accepting a sequence with instances of exactly mapping of `type, ...`. For example, `Sequence[int, float]` accepts `(1, 2.0)` or `[1, 2.0]`.
`set`:
* `Set` is equivalent to [collections.abc.Set][5]. `MutableSet` is equivalent to [collections.abc.MutableSet][6]. `ImmutableSet` is a `Set` that is not a `MutableSet`.
* `Set[ type ]` specializes `Sequence`, accepting a set with instances of `type`.
`mapping`:
* `Mapping` is equivalent to [collections.abc.Mapping][7]. `MutableMapping` is equivalent to [collections.abc. MutableMapping][8]. `ImmutableMapping` is equivalent to [types.MappingProxyType][9].
* `Mapping[ key_type, val_type ]` specializes `Mapping`, accepting items with key of `key_type` and value of `val_type`.
`iterable`:
* `Iterable` is equivalent to [collections.abc.Iterable][10].
* Dual to the side effect of iterating the iterable, `isinstance(instance, Iterable[ type ])` and `isinstance(instance, Iterable[ type, ... ])` always return `False`.
* `Iterable[ type ](iterable)` and `Iterable[ type, ... ](iterable)` creates a iterable proxy with lazy type instrospection on the elements. Example:
```python
for i in Iterable[int]([1, 2, 3]):
print(i)
```
`iterator`:
* `Iterator` is equivalent to [collections.abc.Iterator][11].
* Dual to the side effect of iterating the iterator, `isinstance(instance, Iterator[ type ])` and `isinstance(instance, Iterator[ type, ... ])` always return `False`.
* `Iterator[ type ](iterator)` and `Iterator[ type, ... ](iterator)` creates a iterator proxy with lazy type instrospection on the elements. Example:
```python
for i in Iterator[int](iter([1, 2, 3])):
print(i)
```
`special`:
* `Any` accepts any object, including type and non-type objects. It's guaranteed that `isinstance(..., Any)` returns `True` and `issubclass(..., Any)` returns `True`.
* `Union[ type, ... ]` acceps instance that match one of `type, ...`. For example, `isinstance(42, Union[int, float]` returns `True`.
[3]: https://docs.python.org/3/library/collections.abc.html#collections.abc.Sequence
[4]: https://docs.python.org/3/library/collections.abc.html#collections.abc.MutableSequence
[5]: https://docs.python.org/3/library/collections.abc.html#collections.abc.Set
[6]: https://docs.python.org/3/library/collections.abc.html#collections.abc.MutableSet
[7]: https://docs.python.org/3/library/collections.abc.html#collections.abc.Mapping
[8]: https://docs.python.org/3/library/collections.abc.html#collections.abc.MutableMapping
[9]: https://docs.python.org/3.4/library/types.html#types.MappingProxyType
[10]: https://docs.python.org/3/library/collections.abc.html#collections.abc.Iterable
[11]: https://docs.python.org/3/library/collections.abc.html#collections.abc.Iterator
## `magic_constrains.decorator`
`magic_constrains` provides following decorators for parameter declaration:
* `function_constraints`
* `method_constraints`
* `class_initialization_constraints`
### `function_constraints`
`function_constraints` supports two forms of invocations:
1. `function_constraints(<type object>, ...)`
2. `function_constraints(Parameter(name, <type object>, nullable=False, default=None), ..., pass_by_compound=True)`
Example:
```python
from magic_constraints import function_constraints, Parameter
@function_constraints(
int, float, int, str,
)
def form1(a, b, c=42, d=None):
return a, b, c, d
@function_constraints(
Parameter('a', int),
Parameter('b', float),
Parameter('c', int, default=42),
Parameter('d', str, nullable=True, default=None),
pass_by_compound=True,
)
def form2(args):
return args.a, args.b, args.c, args.d
```
`form1` of `function_constraints` accepts `n` type objects, `n` equals to the number of parameters of the function decorated by `function_constraints`. There are some several promises on the form of parameter:
* only the `POSITIONAL_ONLY` or `POSITIONAL_OR_KEYWORD` parameters are accepted, see [inspect.Parameter.kind][12] for more information.
* parameter without default value is treated as non-`nullable` and without `default`. This concepts will be introduced in the field of `Parameter`.
* parameter with default value other than `None` is treated as non-`nullable` and with `default` bound to such value.
* parameter with `None` as its default value is treated as `nullable` and with `default` bound to `None`.
`form2` is enable by passing the keyword-only argument `pass_by_compound=True` to `function_constraints`. `form2` accepts arbitrary number of `Parameter` instances. After checking the input arguments in runtime, thoses arguments will be bound to a single object as its attributes. Hence, in this cases user-defined function, that is, the one decorated by `function_constraints` should define only one `POSITIONAL_ONLY` argument.
Signature of Parameter: `Parameter(name, type_, nullable=False, default=None, validator=None)`. Explanation:
* `name` is name of parameter. `name` must follows [the rule of defining identifier][13] of Python.
* `type_` defines the type of accepted instances, should be a type object.
* (optional) `nullable=True` means the parameter can accept `None` as its value, independent of `type_`. If omitted, `nullable=False`.
* (optional) `default` defines the default value of parameter. If omitted and there is no argument could be bound to the parameter in the runtime, `MagicSyntaxError` will be raised.
* (optional) `validator` accepts a callable that with single positional argument and returns a boolean value. If defined, `validator` will be invoked after the type introspection. If `validator` returns `False`, `MagicTypeError` will be raised.
[12]: https://docs.python.org/3.5/library/inspect.html#inspect.Parameter.kind
[13]: https://docs.python.org/2/reference/lexical_analysis.html#identifiers
### `method_constraints`
`method_constraints` is almost identical to `function_constraints`, except that `method_constraints` decorates [method][14] instead of [function][15]. Make sure you understand what the method is. Here's a example of usage:
```python
from magic_constraints import method_constraints, Parameter
class Example(object):
@classmethod
@method_constraints(
int, float, int, str,
)
def form1(cls, a, b, c=42, d=None):
return a, b, c, d
@method_constraints(
Parameter('a', int),
Parameter('b', float),
Parameter('c', int, default=42),
Parameter('d', str, nullable=True, default=None),
pass_by_compound=True,
)
def form2(self, args):
return args.a, args.b, args.c, args.d
```
[14]: https://docs.python.org/3/glossary.html#term-method
[15]: https://docs.python.org/3/glossary.html#term-function
### `class_initialization_constraints`
`class_initialization_constraints` is a class decorator requires a class with `INIT_PARAMETERS` attribute. `INIT_PARAMETERS` should be a sequence of `Parameter` instances. After decoration, `class_initialization_constraints` will inject a `__init__` for argument processing. Similar to `pass_by_compound=True`, accepted arguments will be bound to `self`. User-defined `__init__`, within the decorated class or the superclass, will be invoked with single argument `self`. As a consequence, user-defined `__init__` should not define any argument except `self`.
Example:
```python
from magic_constraints import class_initialization_constraints, Parameter
@class_initialization_constraints
class Example(object):
INIT_PARAMETERS = [
Parameter('a', int),
]
def __init__(self):
assert self.a == 1
```
[![PyPI](https://img.shields.io/pypi/pyversions/magic_constraints.svg)](https://pypi.python.org/pypi/magic_constraints) [![Build
Status](https://travis-ci.org/huntzhan/magic-constraints.svg?branch=master)](https://travis-ci.org/huntzhan/magic-constraints)
[![Coverage Status](https://coveralls.io/repos/github/huntzhan/magic-constraints/badge.svg?branch=master)](https://coveralls.io/github/huntzhan/magic-constraints?branch=master)
## Introduction
**v0.2 is not released yet. This document is UNSTABLE!!!!!!! Might change a lot in the future.**
`magic-constraints` supports:
1. [type introspection][2] on "specialized" [abstract base classes][1] (kind of).
2. declaration and dynamic chekcing on the parameters of function/method.
[1]: https://docs.python.org/3/glossary.html#term-abstract-base-class
[2]: https://en.wikipedia.org/wiki/Type_introspection
## Quick Start
### Install
```
pip install magic-constraints
```
### Abstract Base Classes Introspection:
`magic-constraints` implemented a few ABCs for type introspection.
Details will be presented in the next section. Example:
```python
from magic_constraints import Sequence, MutableSequence, ImmutableSequence
# True.
isinstance([1, 2, 3], Sequence)
# True.
isinstance([1, 2, 3], MutableSequence)
# True.
isinstance((1, 2, 3), ImmutableSequence)
# True, Sequence with int.
isinstance([1, 2, 3], Sequence[int])
# False, 2.0 is float.
isinstance([1, 2.0, 3], Sequence[int])
# True.
isinstance([(1, 2), (3, 4)], Sequence[ImmutableSequence[int]])
# False, 3.0 is float.
isinstance([(1, 2), (3.0, 4)], Sequence[ImmutableSequence[int]])
# False, [3, 4] is MutableSequence.
isinstance([(1, 2), [3, 4]], Sequence[ImmutableSequence[int]])
# more avaliable ABCs.
from magic_constraints import (
Sequence,
MutableSequence,
ImmutableSequence,
Set,
MutableSet,
ImmutableSet,
Mapping,
MutableMapping,
ImmutableMapping,
Iterable,
Iterator,
Any,
Union,
)
```
Declaration on function parameters:
```python
from magic_constraints import function_constraints, Parameter, Sequence
@function_constraints(
str, Sequence[int],
)
def func_foo(foo, bar):
return {foo: bar}
@function_constraints(
Parameter('foo', str),
Parameter('bar', Sequence[int], nullable=True, default=[1, 2, 3]),
pass_by_compound=True,
)
def func_bar(args):
return {args.foo: args.bar}
# more decorators.
from magic_constraints.decorator import (
function_constraints,
method_constraints,
class_initialization_constraints,
)
```
Parameter checking:
```python
>>> func_foo('ok', [1, 2, 3])
{'ok': [1, 2, 3]}
>>> func_foo('ops', 42)
Traceback (most recent call last):
...
magic_constraints.exception.MagicTypeError:
MagicTypeError: argument unmatched.
-----------------------------------
argument: 42
parameter: Parameter(name='bar', type_=Sequence[int])
-----------------------------------
>>> func_foo('ops', None)
Traceback (most recent call last):
...
magic_constraints.exception.MagicTypeError:
MagicTypeError: argument unmatched.
-----------------------------------
argument: None
parameter: Parameter(name='bar', type_=Sequence[int])
-----------------------------------
>>>
>>>
>>> func_bar('ops')
{'ops': [1, 2, 3]}
>>> func_bar('ops', None)
{'ops': None}
>>> func_bar('ok', [2, 3, 4])
{'ok': [2, 3, 4]}
>>> func_bar('ops', 42)
Traceback (most recent call last):
...
MagicTypeError: argument unmatched.
-----------------------------------
argument: 42
parameter: Parameter(name='bar', type_=Sequence[int], default=[1, 2, 3], nullable=True)
-----------------------------------
```
## `magic_constrains.types`
Supported ABCs and avaliable specialization of ABCs:
```
type ::= abc
| speical
| <any other type object>
abc ::= sequence
| set
| mapping
| iterable
| iterator
sequence ::= Sequence
| Sequence [ type ]
| Sequence [ type, ... ]
| MutableSequence
| MutableSequence [ type ]
| MutableSequence [ type, ... ]
| ImmutableSequence
| ImmutableSequence [ type ]
| ImmutableSequence [ type, ... ]
set ::= Set
| Set [ type ]
| MutableSet
| MutableSet [ type ]
| ImmutableSet
| ImmutableSet [ type ]
mapping ::= Mapping
| Mapping [ type, type ]
| MutableMapping
| MutableMapping [ type, type ]
| ImmutableMapping
| ImmutableMapping [ type, type ]
iterable ::= Iterable
| Iterable [ type ]
| Iterable [ type, ... ]
iterator ::= Iterator
| Iterator [ type ]
| Iterator [ type, ... ]
speical ::= Any
| Union [ type, ... ]
```
Explanations are as follow.
`type` means type object in Python. `abc` defines several supported ABCs. `speical` defines some type objects for some spectial purposes.
`sequence`:
* `Sequence` is equivalent to [collections.abc.Sequence][3]. `MutableSequence` is equivalent to [collections.abc.MutableSequence][4]. `ImmutableSequence` is a `Sequence` that is not a `MutableSequence`.
* `Sequence[ type ]` specializes `Sequence`, accepting a sequence with instances of `type`.
* `Sequence[ type, ... ]` specialized `Sequence`, accepting a sequence with instances of exactly mapping of `type, ...`. For example, `Sequence[int, float]` accepts `(1, 2.0)` or `[1, 2.0]`.
`set`:
* `Set` is equivalent to [collections.abc.Set][5]. `MutableSet` is equivalent to [collections.abc.MutableSet][6]. `ImmutableSet` is a `Set` that is not a `MutableSet`.
* `Set[ type ]` specializes `Sequence`, accepting a set with instances of `type`.
`mapping`:
* `Mapping` is equivalent to [collections.abc.Mapping][7]. `MutableMapping` is equivalent to [collections.abc. MutableMapping][8]. `ImmutableMapping` is equivalent to [types.MappingProxyType][9].
* `Mapping[ key_type, val_type ]` specializes `Mapping`, accepting items with key of `key_type` and value of `val_type`.
`iterable`:
* `Iterable` is equivalent to [collections.abc.Iterable][10].
* Dual to the side effect of iterating the iterable, `isinstance(instance, Iterable[ type ])` and `isinstance(instance, Iterable[ type, ... ])` always return `False`.
* `Iterable[ type ](iterable)` and `Iterable[ type, ... ](iterable)` creates a iterable proxy with lazy type instrospection on the elements. Example:
```python
for i in Iterable[int]([1, 2, 3]):
print(i)
```
`iterator`:
* `Iterator` is equivalent to [collections.abc.Iterator][11].
* Dual to the side effect of iterating the iterator, `isinstance(instance, Iterator[ type ])` and `isinstance(instance, Iterator[ type, ... ])` always return `False`.
* `Iterator[ type ](iterator)` and `Iterator[ type, ... ](iterator)` creates a iterator proxy with lazy type instrospection on the elements. Example:
```python
for i in Iterator[int](iter([1, 2, 3])):
print(i)
```
`special`:
* `Any` accepts any object, including type and non-type objects. It's guaranteed that `isinstance(..., Any)` returns `True` and `issubclass(..., Any)` returns `True`.
* `Union[ type, ... ]` acceps instance that match one of `type, ...`. For example, `isinstance(42, Union[int, float]` returns `True`.
[3]: https://docs.python.org/3/library/collections.abc.html#collections.abc.Sequence
[4]: https://docs.python.org/3/library/collections.abc.html#collections.abc.MutableSequence
[5]: https://docs.python.org/3/library/collections.abc.html#collections.abc.Set
[6]: https://docs.python.org/3/library/collections.abc.html#collections.abc.MutableSet
[7]: https://docs.python.org/3/library/collections.abc.html#collections.abc.Mapping
[8]: https://docs.python.org/3/library/collections.abc.html#collections.abc.MutableMapping
[9]: https://docs.python.org/3.4/library/types.html#types.MappingProxyType
[10]: https://docs.python.org/3/library/collections.abc.html#collections.abc.Iterable
[11]: https://docs.python.org/3/library/collections.abc.html#collections.abc.Iterator
## `magic_constrains.decorator`
`magic_constrains` provides following decorators for parameter declaration:
* `function_constraints`
* `method_constraints`
* `class_initialization_constraints`
### `function_constraints`
`function_constraints` supports two forms of invocations:
1. `function_constraints(<type object>, ...)`
2. `function_constraints(Parameter(name, <type object>, nullable=False, default=None), ..., pass_by_compound=True)`
Example:
```python
from magic_constraints import function_constraints, Parameter
@function_constraints(
int, float, int, str,
)
def form1(a, b, c=42, d=None):
return a, b, c, d
@function_constraints(
Parameter('a', int),
Parameter('b', float),
Parameter('c', int, default=42),
Parameter('d', str, nullable=True, default=None),
pass_by_compound=True,
)
def form2(args):
return args.a, args.b, args.c, args.d
```
`form1` of `function_constraints` accepts `n` type objects, `n` equals to the number of parameters of the function decorated by `function_constraints`. There are some several promises on the form of parameter:
* only the `POSITIONAL_ONLY` or `POSITIONAL_OR_KEYWORD` parameters are accepted, see [inspect.Parameter.kind][12] for more information.
* parameter without default value is treated as non-`nullable` and without `default`. This concepts will be introduced in the field of `Parameter`.
* parameter with default value other than `None` is treated as non-`nullable` and with `default` bound to such value.
* parameter with `None` as its default value is treated as `nullable` and with `default` bound to `None`.
`form2` is enable by passing the keyword-only argument `pass_by_compound=True` to `function_constraints`. `form2` accepts arbitrary number of `Parameter` instances. After checking the input arguments in runtime, thoses arguments will be bound to a single object as its attributes. Hence, in this cases user-defined function, that is, the one decorated by `function_constraints` should define only one `POSITIONAL_ONLY` argument.
Signature of Parameter: `Parameter(name, type_, nullable=False, default=None, validator=None)`. Explanation:
* `name` is name of parameter. `name` must follows [the rule of defining identifier][13] of Python.
* `type_` defines the type of accepted instances, should be a type object.
* (optional) `nullable=True` means the parameter can accept `None` as its value, independent of `type_`. If omitted, `nullable=False`.
* (optional) `default` defines the default value of parameter. If omitted and there is no argument could be bound to the parameter in the runtime, `MagicSyntaxError` will be raised.
* (optional) `validator` accepts a callable that with single positional argument and returns a boolean value. If defined, `validator` will be invoked after the type introspection. If `validator` returns `False`, `MagicTypeError` will be raised.
[12]: https://docs.python.org/3.5/library/inspect.html#inspect.Parameter.kind
[13]: https://docs.python.org/2/reference/lexical_analysis.html#identifiers
### `method_constraints`
`method_constraints` is almost identical to `function_constraints`, except that `method_constraints` decorates [method][14] instead of [function][15]. Make sure you understand what the method is. Here's a example of usage:
```python
from magic_constraints import method_constraints, Parameter
class Example(object):
@classmethod
@method_constraints(
int, float, int, str,
)
def form1(cls, a, b, c=42, d=None):
return a, b, c, d
@method_constraints(
Parameter('a', int),
Parameter('b', float),
Parameter('c', int, default=42),
Parameter('d', str, nullable=True, default=None),
pass_by_compound=True,
)
def form2(self, args):
return args.a, args.b, args.c, args.d
```
[14]: https://docs.python.org/3/glossary.html#term-method
[15]: https://docs.python.org/3/glossary.html#term-function
### `class_initialization_constraints`
`class_initialization_constraints` is a class decorator requires a class with `INIT_PARAMETERS` attribute. `INIT_PARAMETERS` should be a sequence of `Parameter` instances. After decoration, `class_initialization_constraints` will inject a `__init__` for argument processing. Similar to `pass_by_compound=True`, accepted arguments will be bound to `self`. User-defined `__init__`, within the decorated class or the superclass, will be invoked with single argument `self`. As a consequence, user-defined `__init__` should not define any argument except `self`.
Example:
```python
from magic_constraints import class_initialization_constraints, Parameter
@class_initialization_constraints
class Example(object):
INIT_PARAMETERS = [
Parameter('a', int),
]
def __init__(self):
assert self.a == 1
```
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