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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
from gerber.utils import *
from gerber.am_eval import OpCode
from gerber.am_statements import *
class AMExpression(object):
CONSTANT = 1
VARIABLE = 2
OPERATOR = 3
def __init__(self, kind):
self.kind = kind
@property
def value(self):
return self
def optimize(self):
pass
def to_inch(self):
return AMOperatorExpression(AMOperatorExpression.DIV, self,
AMConstantExpression(MILLIMETERS_PER_INCH))
def to_metric(self):
return AMOperatorExpression(AMOperatorExpression.MUL, self,
AMConstantExpression(MILLIMETERS_PER_INCH))
def to_gerber(self, settings=None):
pass
def to_instructions(self):
pass
class AMConstantExpression(AMExpression):
def __init__(self, value):
super(AMConstantExpression, self).__init__(AMExpression.CONSTANT)
self._value = value
@property
def value(self):
return self._value
def optimize(self):
return self
def to_gerber(self, settings=None):
return str(self._value)
def to_instructions(self):
return [(OpCode.PUSH, self._value)]
class AMVariableExpression(AMExpression):
def __init__(self, number):
super(AMVariableExpression, self).__init__(AMExpression.VARIABLE)
self.number = number
def optimize(self):
return self
def to_gerber(self, settings=None):
return '$%d' % self.number
def to_instructions(self):
return (OpCode.LOAD, self.number)
class AMOperatorExpression(AMExpression):
ADD = '+'
SUB = '-'
MUL = 'X'
DIV = '/'
def __init__(self, op, lvalue, rvalue):
super(AMOperatorExpression, self).__init__(AMExpression.OPERATOR)
self.op = op
self.lvalue = lvalue
self.rvalue = rvalue
def optimize(self):
self.lvalue = self.lvalue.optimize()
self.rvalue = self.rvalue.optimize()
if isinstance(self.lvalue, AMConstantExpression) and isinstance(self.rvalue, AMConstantExpression):
lvalue = float(self.lvalue.value)
rvalue = float(self.rvalue.value)
value = lvalue + rvalue if self.op == self.ADD else \
lvalue - rvalue if self.op == self.SUB else \
lvalue * rvalue if self.op == self.MUL else \
lvalue / rvalue if self.op == self.DIV else None
return AMConstantExpression(value)
elif self.op == self.ADD:
if self.rvalue.value == 0:
return self.lvalue
elif self.lvalue.value == 0:
return self.rvalue
elif self.op == self.SUB:
if self.rvalue.value == 0:
return self.lvalue
elif self.lvalue.value == 0 and isinstance(self.rvalue, AMConstantExpression):
return AMConstantExpression(-self.rvalue.value)
elif self.op == self.MUL:
if self.rvalue.value == 1:
return self.lvalue
elif self.lvalue.value == 1:
return self.rvalue
elif self.lvalue == 0 or self.rvalue == 0:
return AMConstantExpression(0)
elif self.op == self.DIV:
if self.rvalue.value == 1:
return self.lvalue
elif self.lvalue.value == 0:
return AMConstantExpression(0)
return self
def to_gerber(self, settings=None):
return '(%s)%s(%s)' % (self.lvalue.to_gerber(settings), self.op, self.rvalue.to_gerber(settings))
def to_instructions(self):
for i in self.lvalue.to_instructions():
yield i
for i in self.rvalue.to_instructions():
yield i
op = OpCode.ADD if self.op == self.ADD else\
OpCode.SUB if self.op == self.SUB else\
OpCode.MUL if self.op == self.MUL else\
OpCode.DIV
yield (op, None)
def eval_macro(instructions):
stack = []
def pop():
return stack.pop()
def push(op):
stack.append(op)
def top():
return stack[-1]
def empty():
return len(stack) == 0
for opcode, argument in instructions:
if opcode == OpCode.PUSH:
push(AMConstantExpression(argument))
elif opcode == OpCode.LOAD:
push(AMVariableExpression(argument))
elif opcode == OpCode.STORE:
yield (-argument, [pop()])
elif opcode == OpCode.ADD:
op1 = pop()
op2 = pop()
push(AMOperatorExpression(AMOperatorExpression.ADD, op2, op1))
elif opcode == OpCode.SUB:
op1 = pop()
op2 = pop()
push(AMOperatorExpression(AMOperatorExpression.SUB, op2, op1))
elif opcode == OpCode.MUL:
op1 = pop()
op2 = pop()
push(AMOperatorExpression(AMOperatorExpression.MUL, op2, op1))
elif opcode == OpCode.DIV:
op1 = pop()
op2 = pop()
push(AMOperatorExpression(AMOperatorExpression.DIV, op2, op1))
elif opcode == OpCode.PRIM:
yield (argument, stack)
stack = []
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