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import ast
from contextvars import ContextVar, Token
from copy import deepcopy
from typing import List, Tuple, Optional, Union, MutableMapping, Any, ContextManager
from public import public
from .formula import Formula
from .mod import Mod
from .op import CodeOp
from .point import Point
@public
class OpResult(object):
"""A result of an operation."""
parents: Tuple
op: ast.operator
name: str
value: Mod
def __init__(self, name: str, value: Mod, op: ast.operator, *parents: Any):
self.parents = tuple(parents)
self.name = name
self.value = value
self.op = op
def __str__(self):
return self.name
def __repr__(self):
char = ""
if isinstance(self.op, ast.Mult):
char = "*"
elif isinstance(self.op, ast.Add):
char = "+"
elif isinstance(self.op, ast.Sub):
char = "-"
elif isinstance(self.op, ast.Div):
char = "/"
parents = char.join(str(parent) for parent in self.parents)
return f"{self.name} = {parents}"
@public
class Action(object):
"""An execution of a formula, on some input points and parameters, with some outputs."""
formula: Formula
input_points: List[Point]
inputs: MutableMapping[str, Mod]
intermediates: MutableMapping[str, Union[Mod, OpResult]]
roots: MutableMapping[str, OpResult]
output_points: List[Point]
def __init__(self, formula: Formula, *points: Point, **inputs: Mod):
self.formula = formula
self.input_points = list(points)
self.inputs = inputs
self.intermediates = {}
self.roots = {}
self.output_points = []
def add_operation(self, op: CodeOp, value: Mod):
parents = []
for parent in {*op.variables, *op.parameters}:
if parent in self.intermediates:
parents.append(self.intermediates[parent])
elif parent in self.inputs:
parents.append(self.inputs[parent])
self.intermediates[op.result] = OpResult(op.result, value, op.operator, *parents)
def add_result(self, point: Point, **outputs: Mod):
for k in outputs:
self.roots[k] = self.intermediates[k]
self.output_points.append(point)
def __repr__(self):
return f"Action({self.formula}, {self.input_points}) = {self.output_points}"
@public
class Context(object):
def _log_action(self, formula: Formula, *points: Point, **inputs: Mod):
raise NotImplementedError
def _log_operation(self, op: CodeOp, value: Mod):
raise NotImplementedError
def _log_result(self, point: Point, **outputs: Mod):
raise NotImplementedError
def _execute(self, formula: Formula, *points: Point, **params: Mod) -> Tuple[Point, ...]:
if len(points) != formula.num_inputs:
raise ValueError(f"Wrong number of inputs for {formula}.")
coords = {}
for i, point in enumerate(points):
if point.coordinate_model != formula.coordinate_model:
raise ValueError(f"Wrong coordinate model of point {point}.")
for coord, value in point.coords.items():
coords[coord + str(i + 1)] = value
locals = {**coords, **params}
self._log_action(formula, *points, **locals)
for op in formula.code:
op_result = op(**locals)
self._log_operation(op, op_result)
locals[op.result] = op_result
result = []
for i in range(formula.num_outputs):
ind = str(i + formula.output_index)
resulting = {}
full_resulting = {}
for variable in formula.coordinate_model.variables:
full_variable = variable + ind
resulting[variable] = locals[full_variable]
full_resulting[full_variable] = locals[full_variable]
point = Point(formula.coordinate_model, **resulting)
self._log_result(point, **full_resulting)
result.append(point)
return tuple(result)
def execute(self, formula: Formula, *points: Point, **params: Mod) -> Tuple[Point, ...]:
"""
Execute a formula.
:param formula: Formula to execute.
:param points: Points to pass into the formula.
:param params: Parameters of the curve.
:return: The resulting point(s).
"""
return self._execute(formula, *points, **params)
def __str__(self):
return self.__class__.__name__
@public
class NullContext(Context):
"""A context that does not trace any operations."""
def _log_action(self, formula: Formula, *points: Point, **inputs: Mod):
pass
def _log_operation(self, op: CodeOp, value: Mod):
pass
def _log_result(self, point: Point, **outputs: Mod):
pass
@public
class DefaultContext(Context):
"""A context that traces executions of formulas."""
actions: List[Action]
def __init__(self):
self.actions = []
def _log_action(self, formula: Formula, *points: Point, **inputs: Mod):
self.actions.append(Action(formula, *points, **inputs))
def _log_operation(self, op: CodeOp, value: Mod):
self.actions[-1].add_operation(op, value)
def _log_result(self, point: Point, **outputs: Mod):
self.actions[-1].add_result(point, **outputs)
_actual_context: ContextVar[Context] = ContextVar("operational_context", default=NullContext())
class _ContextManager(object):
def __init__(self, new_context):
self.new_context = deepcopy(new_context)
def __enter__(self) -> Context:
self.token = setcontext(self.new_context)
return self.new_context
def __exit__(self, t, v, tb):
resetcontext(self.token)
@public
def getcontext() -> Context:
"""Get the current thread/task context."""
return _actual_context.get()
@public
def setcontext(ctx: Context) -> Token:
"""
Set the current thread/task context.
:param ctx: A context to set.
:return: A token to restore previous context.
"""
return _actual_context.set(ctx)
@public
def resetcontext(token: Token):
"""
Reset the context to a previous value.
:param token: A token to restore.
"""
_actual_context.reset(token)
@public
def local(ctx: Optional[Context] = None) -> ContextManager:
"""
Use a local context.
:param ctx: If none, current context is copied.
:return: A context manager.
"""
if ctx is None:
ctx = getcontext()
return _ContextManager(ctx)
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