derivation 0.6.0

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Derivation

Derivation is a flexible payload generating framework with highly-customizable patterns and rules which raise your efficiency significantly on test case implementation against complicated inputs.

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Derivative

Derivative is the primary object which helps you sort out all of possible results with the given inputs.

The script below can be executed directly

from enum import Enum, auto
from operator import or_

from derivation.constraint import MutuallyExclusiveConstraint, OccurrenceConstraint
from derivation.derivative import Derivative


class DerivativeEvent(Enum):
    @staticmethod
    def _generate_next_value_(name, start, count, last_values):
        return name.upper()


class DerivativeEventExample(DerivativeEvent):

    ESSENTIALS = auto()

    OPTIONAL_1 = auto()
    OPTIONAL_2 = auto()


EVENTS_EXAMPLE = {event: {event.value: None} for event in DerivativeEventExample}

occurrence_constraint = OccurrenceConstraint(
    (DerivativeEventExample.ESSENTIALS,),
    min_times=1,
    max_times=1,
)
mutually_exclusive_constraint = MutuallyExclusiveConstraint(
    (
        DerivativeEventExample.OPTIONAL_1,
        DerivativeEventExample.OPTIONAL_2,
    ),
)
derivative = Derivative(
    EVENTS_EXAMPLE,
    or_,
    (occurrence_constraint, mutually_exclusive_constraint),
)

for order, result in derivative.exhaustive():

    print(f"{order}\n{result}\n")

Constraint

Constraint helps you construct the rules for specific requirements of deriving recipe.

Occurrence

Occurrence Constraint make us able to limit the total occurrence times of a specific group of events.

occurrence_constraint = OccurrenceConstraint(
    (DerivativeEventExample.ESSENTIALS,),
    min_times=1,
    max_times=1,
)

# pass
occurrence_constraint.constrain(
    (DerivativeEventExample.ESSENTIALS, DerivativeEventExample.OPTIONAL_1),
)

# error
occurrence_constraint.constrain(
    (DerivativeEventExample.OPTIONAL_1,),
)

Mutually Exclusive

Occurrence Constraint make us able to avoid conflicts of a specific group of events.

mutually_exclusive_constraint = MutuallyExclusiveConstraint(
    (
        DerivativeEventExample.OPTIONAL_1,
        DerivativeEventExample.OPTIONAL_2,
    ),
)

# pass
mutually_exclusive_constraint.constrain(
    (DerivativeEventExample.ESSENTIALS, DerivativeEventExample.OPTIONAL_1),
)

# error
mutually_exclusive_constraint.constrain(
    (DerivativeEventExample.OPTIONAL_1, DerivativeEventExample.OPTIONAL_2),
)

Prerequisite

Prerequisite Constraint define the ordering and dependencies of valid event series.

prerequisite_constraint = PrerequisiteConstraint(
    (DerivativeEventExample.ESSENTIALS,),
    (DerivativeEventExample.OPTIONAL_1, DerivativeEventExample.OPTIONAL_2),
)

# pass
prerequisite_constraint.constrain(
    (DerivativeEventExample.ESSENTIALS, DerivativeEventExample.OPTIONAL_1),
)

# error
prerequisite_constraint.constrain(
    (DerivativeEventExample.OPTIONAL_2,),
)

Termination

Termination constraints focus on the specific group of termination events.

termination_constraint = TerminationConstraint(
    (DerivativeEventExample.OPTIONAL_1, DerivativeEventExample.OPTIONAL_2),
)

# pass
termination_constraint.constrain(
    (DerivativeEventExample.ESSENTIALS, DerivativeEventExample.OPTIONAL_1),
)

# error
termination_constraint.constrain(
    (DerivativeEventExample.ESSENTIALS,),
)

Federation

Federation objects allow you construct a more complicated structure with multiple derivation instances, as well as a couple of parameters sets and filtering rules.

Append script below to the bottom of the previous example for derivation.

from derivation.federation import Federation


class DerivativePatternExample(DerivativeEvent):

    COMPOSITED = auto()


PATTERNS_EXAMPLE = {
    DerivativePatternExample.COMPOSITED: (
        lambda slot_1, slot_2, constant, customized: {
            "slot_1": slot_1,
            "slot_2": slot_2,
            "constant": constant,
            "customized": customized,
        }
    )
}


class DerivativeParamsMapExample(DerivativeEvent):

    DEFAULT = auto()


PARAMS_MAPS_EXAMPLE = {
    DerivativeParamsMapExample.DEFAULT: {"constant": "default"},
}


class DerivativeFilterExample(DerivativeEvent):

    RICH_SLOT_1 = auto()


FILTERS_EXAMPLE = {
    DerivativeFilterExample.RICH_SLOT_1: lambda x: len(x["slot_1"]) > 1,
}

federation = Federation[
    DerivativePatternExample,
    DerivativeParamsMapExample,
    DerivativeFilterExample,
    dict,
](
    {"slot_1": derivative, "slot_2": derivative},
    PATTERNS_EXAMPLE,
    PARAMS_MAPS_EXAMPLE,
    FILTERS_EXAMPLE,
)

for composited_result in federation.exhaustive(
    DerivativePatternExample.COMPOSITED,
    (DerivativeParamsMapExample.DEFAULT,),
    {"customized": "customized"},
    (DerivativeFilterExample.RICH_SLOT_1,),
):

    print(f"{composited_result}\n")

Derivatives & Patterns

Federation object allows you pre-register some patterns which describe how should the derivatives combine with each other.

Pattern are generally a callable function and introduce candidates of the derivatives or apply fixed value as the parameters, we encourage users define readable variable name for better collaboration.

PATTERNS_EXAMPLE = {
    DerivativePatternExample.COMPOSITED: (

        # Callable object as pre-defined pattern.
        lambda slot_1, slot_2, constant, customized: {
            "slot_1": slot_1,
            "slot_2": slot_2,
            "constant": constant,
            "customized": customized,
        }
    )
}

Parameters Maps

For the parameters do not require exhausting via a derivative object, parameters maps can be attached as the fixed values.

PARAMS_MAPS_EXAMPLE = {

    # Apply fixed string object "default" to `constant` parameter inside patterns
    DerivativeParamsMapExample.DEFAULT: {"constant": "default"},
}

Filters

In order to re-use federation object in many similar scenarios, pre-register filters provide a more flexible approach for fetching candidates with specific features.

FILTERS_EXAMPLE = {

    # Only allow results which contain more than one item in slot_1.
    DerivativeFilterExample.RICH_SLOT_1: lambda x: len(x["slot_1"]) > 1,
}

Customized Parameters

Temporary parameters right inside each exhaustive iterator are also supported, which can help you achieve much more flexible design against edge cases.

for composited_result in federation.exhaustive(
    DerivativePatternExample.COMPOSITED,
    (DerivativeParamsMapExample.DEFAULT,),

    # Temporary parameters only take effects within this iterator.
    {"customized": "customized"},
    (DerivativeFilterExample.RICH_SLOT_1,),
):

    print(f"{composited_result}\n")

Contribution

• RainrainWu