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#! /usr/bin/env python
# -*- coding: utf-8 -*-
# copyright 2014 Hamilton Kibbe <ham@hamiltonkib.be>
# copyright 2014 Paulo Henrique Silva <ph.silva@gmail.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
""" This module provides RS-274-X AM macro evaluation.
"""
class OpCode:
PUSH = 1
LOAD = 2
STORE = 3
ADD = 4
SUB = 5
MUL = 6
DIV = 7
PRIM = 8
@staticmethod
def str(opcode):
if opcode == OpCode.PUSH:
return "OPCODE_PUSH"
elif opcode == OpCode.LOAD:
return "OPCODE_LOAD"
elif opcode == OpCode.STORE:
return "OPCODE_STORE"
elif opcode == OpCode.ADD:
return "OPCODE_ADD"
elif opcode == OpCode.SUB:
return "OPCODE_SUB"
elif opcode == OpCode.MUL:
return "OPCODE_MUL"
elif opcode == OpCode.DIV:
return "OPCODE_DIV"
elif opcode == OpCode.PRIM:
return "OPCODE_PRIM"
else:
return "UNKNOWN"
def eval_macro(instructions, parameters={}):
if not isinstance(parameters, type({})):
p = {}
for i, val in enumerate(parameters):
p[i + 1] = val
parameters = p
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(argument)
elif opcode == OpCode.LOAD:
push(parameters.get(argument, 0))
elif opcode == OpCode.STORE:
parameters[argument] = pop()
elif opcode == OpCode.ADD:
op1 = pop()
op2 = pop()
push(op2 + op1)
elif opcode == OpCode.SUB:
op1 = pop()
op2 = pop()
push(op2 - op2)
elif opcode == OpCode.MUL:
op1 = pop()
op2 = pop()
push(op2 * op1)
elif opcode == OpCode.DIV:
op1 = pop()
op2 = pop()
push(op2 / op1)
elif opcode == OpCode.PRIM:
yield "%d,%s" % (argument, ",".join([str(x) for x in stack]))
stack = []
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