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# -*- coding: utf-8 -*-
#
# AWL simulator - labels
#
# Copyright 2012-2014 Michael Buesch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from __future__ import division, absolute_import, print_function, unicode_literals
from awlsim.common.compat import *
from awlsim.core.parser import *
from awlsim.core.operators import *
from awlsim.core.util import *
class AwlLabel(object):
"""AWL label."""
__slots__ = (
"insn",
"label",
)
def __init__(self, insn, label):
self.insn = insn
self.label = label
def getLabelName(self):
return self.label
def getInsn(self):
return self.insn
@classmethod
def resolveLabels(cls, insns):
# Build the label table
labels = []
for i, insn in enumerate(insns):
rawInsn = insn.getRawInsn()
if not rawInsn or not rawInsn.hasLabel():
continue
for label in labels:
if label.getLabelName() == rawInsn.getLabel():
raise AwlSimError("Duplicate label '%s' found. "
"Label names have to be unique in a code block." %\
rawInsn.getLabel(),
insn = insn)
labels.append(cls(insn, rawInsn.getLabel()))
# Resolve label references
for insn in insns:
for op in insn.ops:
if op.type != AwlOperator.LBL_REF:
continue
labelIndex = cls.findInList(labels, op.value)
if labelIndex is None:
raise AwlSimError("Referenced label not found",
insn = insn)
op.setLabelIndex(labelIndex)
return labels
@classmethod
def findInList(cls, labelList, label):
for i, lbl in enumerate(labelList):
if lbl.getLabelName() == label:
return i
return None
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