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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2021 Jan Sebastian Götte <gerbonara@jaseg.de>
from dataclasses import dataclass
import operator
import re
import ast
from ..utils import LengthUnit, MM, Inch, MILLIMETERS_PER_INCH
def expr(obj):
return obj if isinstance(obj, Expression) else ConstantExpression(obj)
_make_expr = expr
@dataclass(frozen=True, slots=True)
class Expression:
def optimized(self, variable_binding={}):
return self
def __str__(self):
return f'<{self.to_gerber()}>'
def __repr__(self):
return f'<E {self.to_gerber()}>'
def converted(self, unit):
return self
def calculate(self, variable_binding={}, unit=None):
expr = self.converted(unit).optimized(variable_binding)
if not isinstance(expr, ConstantExpression):
raise IndexError(f'Cannot fully resolve expression due to unresolved variables: {expr} with variables {variable_binding}')
return expr.value
def __add__(self, other):
return OperatorExpression(operator.add, self, expr(other)).optimized()
def __radd__(self, other):
return expr(other) + self
def __sub__(self, other):
return OperatorExpression(operator.sub, self, expr(other)).optimized()
def __rsub__(self, other):
return expr(other) - self
def __mul__(self, other):
return OperatorExpression(operator.mul, self, expr(other)).optimized()
def __rmul__(self, other):
return expr(other) * self
def __truediv__(self, other):
return OperatorExpression(operator.truediv, self, expr(other)).optimized()
def __rtruediv__(self, other):
return expr(other) / self
def __neg__(self):
return 0 - self
def __pos__(self):
return self
@dataclass(frozen=True, slots=True)
class UnitExpression(Expression):
expr: Expression
unit: LengthUnit
def __init__(self, expr, unit):
expr = _make_expr(expr)
if isinstance(expr, UnitExpression):
expr = expr.converted(unit)
object.__setattr__(self, 'expr', expr)
object.__setattr__(self, 'unit', unit)
def to_gerber(self, unit=None):
return self.converted(unit).optimized().to_gerber()
def __eq__(self, other):
return type(other) == type(self) and \
self.unit == other.unit and\
self.expr == other.expr
def __str__(self):
return f'<{self.expr.to_gerber()} {self.unit}>'
def __repr__(self):
return f'<UE {self.expr.to_gerber()} {self.unit}>'
def converted(self, unit):
if self.unit is None or unit is None or self.unit == unit:
return self.expr
elif MM == unit:
return self.expr * MILLIMETERS_PER_INCH
elif Inch == unit:
return self.expr / MILLIMETERS_PER_INCH
else:
raise ValueError(f'invalid unit {unit}, must be "inch" or "mm".')
def __add__(self, other):
if not isinstance(other, UnitExpression):
raise ValueError('Unit mismatch: Can only add/subtract UnitExpression from UnitExpression, not scalar.')
if self.unit == other.unit or self.unit is None or other.unit is None:
return UnitExpression(self.expr + other.expr, self.unit)
if other.unit == 'mm': # -> and self.unit == 'inch'
return UnitExpression(self.expr + (other.expr / MILLIMETERS_PER_INCH), self.unit)
else: # other.unit == 'inch' and self.unit == 'mm'
return UnitExpression(self.expr + (other.expr * MILLIMETERS_PER_INCH), self.unit)
def __radd__(self, other):
# left hand side cannot have been an UnitExpression or __radd__ would not have been called
raise ValueError('Unit mismatch: Can only add/subtract UnitExpression from UnitExpression, not scalar.')
def __sub__(self, other):
return (self + (-other)).optimized()
def __rsub__(self, other):
# see __radd__ above
raise ValueError('Unit mismatch: Can only add/subtract UnitExpression from UnitExpression, not scalar.')
def __mul__(self, other):
return UnitExpression(self.expr * other, self.unit)
def __rmul__(self, other):
return UnitExpression(other * self.expr, self.unit)
def __truediv__(self, other):
return UnitExpression(self.expr / other, self.unit)
def __rtruediv__(self, other):
return UnitExpression(other / self.expr, self.unit)
def __neg__(self):
return UnitExpression(-self.expr, self.unit)
def __pos__(self):
return self
@dataclass(frozen=True, slots=True)
class ConstantExpression(Expression):
value: float
def __float__(self):
return float(self.value)
def __eq__(self, other):
return type(self) == type(other) and self.value == other.value
def to_gerber(self, _unit=None):
return f'{self.value:.6f}'.rstrip('0').rstrip('.')
@dataclass(frozen=True, slots=True)
class VariableExpression(Expression):
number: int
def optimized(self, variable_binding={}):
if self.number in variable_binding:
return ConstantExpression(variable_binding[self.number])
return self
def __eq__(self, other):
return type(self) == type(other) and \
self.number == other.number
def to_gerber(self, _unit=None):
return f'${self.number}'
@dataclass(frozen=True, slots=True)
class OperatorExpression(Expression):
op: str
l: Expression
r: Expression
def __init__(self, op, l, r):
object.__setattr__(self, 'op', op)
object.__setattr__(self, 'l', expr(l))
object.__setattr__(self, 'r', expr(r))
def __eq__(self, other):
return type(self) == type(other) and \
self.op == other.op and \
self.l == other.l and \
self.r == other.r
def optimized(self, variable_binding={}):
l = self.l.optimized(variable_binding)
r = self.r.optimized(variable_binding)
if self.op in (operator.add, operator.mul):
if id(r) < id(l):
l, r = r, l
if isinstance(l, ConstantExpression) and isinstance(r, ConstantExpression):
return ConstantExpression(self.op(float(l), float(r)))
return OperatorExpression(self.op, l, r)
def to_gerber(self, unit=None):
lval = self.l.to_gerber(unit)
rval = self.r.to_gerber(unit)
if isinstance(self.l, OperatorExpression):
lval = f'({lval})'
if isinstance(self.r, OperatorExpression):
rval = f'({rval})'
op = {operator.add: '+',
operator.sub: '-',
operator.mul: 'x',
operator.truediv: '/'} [self.op]
return f'{lval}{op}{rval}'
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