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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2021 Jan Götte <gerbonara@jaseg.de>
import operator
import re
import ast
class Expression(object):
@property
def value(self):
return self
def optimized(self, variable_binding={}):
return self
def __str__(self):
return f'<{self.to_gerber()}>'
class UnitExpression(Expression):
def __init__(self, expr, unit):
self._expr = expr
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 converted(self, unit):
if unit is None or self.unit == unit:
return self._expr
elif unit == 'mm':
return OperatorExpression.mul(self._expr, MILLIMETERS_PER_INCH)
elif unit == 'inch':
return OperatorExpression.div(self._expr, MILLIMETERS_PER_INCH)
else:
raise ValueError('invalid unit, must be "inch" or "mm".')
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}')
class ConstantExpression(Expression):
def __init__(self, value):
self._value = value
@property
def value(self):
return self._value
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):
if isinstance(self._value, str):
return self._value
return f'{self.value:.6f}'.rstrip('0').rstrip('.')
class VariableExpression(Expression):
def __init__(self, number):
self.number = number
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}'
class OperatorExpression(Expression):
def __init__(self, op, l, r):
self.op = op
self.l = ConstantExpression(l) if isinstance(l, (int, float)) else l
self.r = ConstantExpression(r) if isinstance(r, (int, float)) else 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(r), float(l)))
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}'
def _map_expression(node):
if isinstance(node, ast.Num):
return ConstantExpression(node.n)
elif isinstance(node, ast.BinOp):
op_map = {ast.Add: operator.add, ast.Sub: operator.sub, ast.Mult: operator.mul, ast.Div: operator.truediv}
return OperatorExpression(op_map[type(node.op)], _map_expression(node.left), _map_expression(node.right))
elif isinstance(node, ast.UnaryOp):
if type(node.op) == ast.UAdd:
return _map_expression(node.operand)
else:
return OperatorExpression(operator.sub, ConstantExpression(0), _map_expression(node.operand))
elif isinstance(node, ast.Name):
return VariableExpression(int(node.id[3:])) # node.id has format var[0-9]+
else:
raise SyntaxError('Invalid aperture macro expression')
def _parse_expression(expr):
expr = expr.lower().replace('x', '*')
expr = re.sub(r'\$([0-9]+)', r'var\1', expr)
try:
parsed = ast.parse(expr, mode='eval').body
except SyntaxError as e:
raise SyntaxError('Invalid aperture macro expression') from e
return _map_expression(parsed)
def parse_macro(macro, unit):
blocks = re.sub(r'\s', '', macro).split('*')
variables = {}
for block in blocks:
block = block.strip()
if block[0:1] == '0 ': # comment
continue
elif block[0] == '$': # variable definition
name, expr = block.partition('=')
variables[int(name[1:])] = _parse_expression(expr)
else: # primitive
primitive, args = block.split(',')
yield PRIMITIVE_CLASSES[int(primitive)](unit=unit, args=list(map(_parse_expression, args)))
if __name__ == '__main__':
import sys
for line in sys.stdin:
expr = _parse_expression(line.strip())
print(expr, '->', expr.optimized())
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