finesse.py 62.1 KB
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# -*- coding: utf-8 -*-
"""
Created on Sun Jan 27 09:56:53 2013

PyKat - Python interface and wrapper for FINESSE
Copyright (C) 2013 Daniel David Brown

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.

Contact at ddb@star.sr.bham.ac.uk

@author: Daniel Brown
"""
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from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

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import sys
import os
import subprocess
import tempfile
import numpy as np
import datetime
import pickle
import pykat
import warnings
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import re
import math       
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import itertools
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import ctypes
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import ctypes.util
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import collections
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import re
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import copy
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try:
    # Python 2
    from itertools import izip_longest
except ImportError:
    # Python 3
    from itertools import zip_longest as izip_longest
"""
try:
    from future_builtins import zip_longest
except ImportError: # not 2.6+ or is 3.x
    try:
        from itertools import izip_longest as zip_longest # < 2.5 or 3.x
    except ImportError:
        print("boom")
        pass
"""
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from collections import namedtuple, OrderedDict
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from pykat.node_network import NodeNetwork
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from pykat.detectors import BaseDetector as Detector
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from pykat.components import Component
from pykat.commands import Command, xaxis
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from pykat.SIfloat import *
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from pykat.param import Param, AttrParam
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import pykat.external.six as six

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import pykat.exceptions as pkex

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from pykat import USE_GUI, NoGUIException
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if USE_GUI:
    from pykat.gui.gui import pyKatGUI
    from PyQt4.QtCore import QCoreApplication
    from PyQt4.QtGui import QApplication
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from multiprocessing import Process, Manager

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NO_BLOCK = "NO_BLOCK"
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pykat_web = "www.gwoptics.org/pykat"

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# containers used in the trace routine
space_trace = namedtuple("space_trace", ['gouyx','gouyy'])
node_trace = namedtuple("node_trace", ['qx','qy'])
cav_trace = namedtuple("cav_trace", ['isStable','gx','gy','qx','qy','finesse','loss','length','FSR','FWHM','pole'])
         
lkat_location = ctypes.util.find_library("kat")
                                     
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def f__lkat_process(callback, cmd, kwargs):
    """
    """
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    if lkat_location == None:
        raise RuntimeError("Could not find shared library 'libkat', please install to a system location or copy to the same directory as this script")
        
    lkat = ctypes.PyDLL(lkat_location)
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    try:
        lkat._pykat_preInit() # must always be called, sets up
                        # exception handling and such no simulation
                        # specifc code here

        # reads in the kat.ini and setups up other parts
        lkat._pykat_init()
        lkat._pykat_setup(cmd)
    
        callback(lkat, **kwargs)
    
    except Exception as ex: 
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        print ("Exception caught in python: ", ex.message)
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    finally:
        # This should always be called no matter what
        lkat._pykat_finish(0)
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def f__lkat_trace_callback(lkat, trace_info, getCavities, getNodes, getSpaces):
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    """
    lkat callback for computing the beam traces through a setup.
    Returns a dictionary of nodes, spaces and cavities and the
    various outputs of the tracing algorithm.
    """
    import pylibkat

    # first we need to get a handle on the internals of Finesse
    inter = pylibkat.interferometer.in_dll(lkat, "inter")

    lkat._pykat_step()

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    if getNodes:
        for n in range(0, inter.num_nodes):
            node = inter.node_list[n]

            node_info = node_trace(
                                    qx = complex(node.qx.re, node.qx.im),
                                    qy = complex(node.qy.re, node.qy.im)
                                    )

            trace_info[node.name] = node_info

    if getCavities:
        for c in range(0, inter.num_cavities):
            cav = inter.cavity_list[c]

            cav_info = cav_trace(
                                isStable = (cav.stable == 1),
                                gx = cav.stability_x,
                                gy = cav.stability_y,
                                qx = complex(cav.qx.re, cav.qx.im),
                                qy = complex(cav.qy.re, cav.qy.im),
                                finesse = cav.finesse,
                                FSR = cav.FSR,
                                FWHM = cav.FWHM,
                                loss = cav.loss,
                                length = cav.length,
                                pole = cav.pole
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                                )

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            trace_info[cav.name] = cav_info
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    if getSpaces:
        for s in range(0, inter.num_spaces):
            space = inter.space_list[s]
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            trace_info[space.name] = space_trace(gouyx = space.gouy_x,
                                                 gouyy = space.gouy_y)
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class katRun(object):
    def __init__(self):
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        self.runDateTime = datetime.datetime.now()
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        self.x = None
        self.y = None
        self.xlabel = None
        self.ylabels = None
        self.katScript = None
        self.katVersion = None
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        self.yaxis = None
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    def plot(self):
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        import pylab
        
        pylab.plot(self.x, self.y)
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        pylab.legend(self.ylabels,0)
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        pylab.xlabel(self.xlabel)
        pylab.show()
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    def savekatRun(self, filename):
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        with open(filename,'w') as outfile:
            pickle.dump(self, outfile)
    
    @staticmethod
    def loadKatRun(filename):
        with open(filename,'r') as infile:
            return pickle.load(infile)
    
    def get(self, value): return self[value]
    
    def __getitem__(self, value):
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        idx = [i for i in range(len(self.ylabels)) if self.ylabels[i].split()[0] == str(value)]
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        if len(idx) > 0:
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            out = self.y[:, idx]
            
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            if len(idx) == 1:
                if self.yaxis == "abs:deg":
                    out = self.y[:, idx[0]]
                elif self.yaxis == "re:im":
                    out = self.y[:, idx[0]]
            else: 
                if self.yaxis == "abs:deg":
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                    out = self.y[:, idx[0]] * np.exp(1j*math.pi*self.y[:, idx[1]]/180.0)
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                elif self.yaxis == "re:im":
                    out = self.y[:, idx[0]] + 1j*self.y[:, idx[1]]
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            if out.size == 1:
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                return out[0].squeeze()
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            else:
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                return out.squeeze()
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        else:
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            raise  pkex.BasePyKatException("No output by the name '{0}' found in the output".format(str(value)))
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class katRun2D(object):
    def __init__(self):
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        self.runDateTime = datetime.datetime.now()
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        self.x = None
        self.y = None
        self.z = None
        self.xlabel = None
        self.ylabel = None
        self.zlabels = None
        self.katScript = None
        self.katVersion = None
        
    def saveKatRun(self, filename):
        with open(filename,'w') as outfile:
            pickle.dump(self, outfile)
    
    @staticmethod
    def loadKatRun(filename):
        with open(filename,'r') as infile:
            return pickle.load(infile)
    
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    def get(self, value): return self[value].squeeze()
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    def __getitem__(self, value):
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        idx = [i for i in range(len(self.zlabels)) if self.zlabels[i].split()[0] == str(value)]
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        if len(idx) > 0:
            return self.z[idx].squeeze()
        else:
            raise  pkex.BasePyKatException("No output by the name {0} found".format(str(value)))
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class Signals(object):
    class fsig(object):
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        def __init__(self, param, name, amplitude, phase, signal):
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            self._params = []
            self.__target = param
            self.__name = name
            self.__amplitude = Param("amp", self, SIfloat(amplitude))
            self.__phase = Param("phase", self, SIfloat(phase))
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            self.__removed = False
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            self.__signal = signal
			
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            # unfortunatenly the target names for fsig are not the same as the
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            # various parameter names of the components, e.g. mirror xbeta is x 
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            # for fsig. So we need to check here what type of component we are targetting
            # and then based on the parameter specfied get the name
            if not param.canFsig:
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                raise  pkex.BasePyKatException("Cannot fsig parameter {1} on component {0}".format(str(param._owner().name), param.name))
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        def _register_param(self, param):
            self._params.append(param)
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        @property
        def removed(self): return self.__removed
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        def remove(self):
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            self.__signal._kat.remove(self)
            
        def _on_remove(self):
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            if self.__removed:
                raise pkex.BasePyKatException("Signal {0} has already been marked as removed".format(self.name))
            else:
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                self.__signal.targets.remove(self)
                self.__remove = True
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        @property
        def name(self): return self.__name

        @property
        def amplitude(self): return self.__amplitude
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        @amplitude.setter
        def amplitude(self,value): self.__amplitude.value = SIfloat(value)

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        @property
        def phase(self): return self.__phase
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        @phase.setter
        def phase(self,value): self.__phase.value = SIfloat(value)
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        @property
        def target(self): return self.__target.fsig_name

        @property
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        def owner(self): return self.__target._owner().name
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        def getFinesseText(self):
            rtn = []
    
            for p in self._params:
                rtn.extend(p.getFinesseText())
        
            return rtn
    
    @property
    def name(self):
        # if we don't have any signals yet then use a dummy name
        # however we need to always tune a real fsig command
        # so need to get the name of at least one of them
        # as if you tune one you tune them all
        if len(self.targets) == 0:
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            return "fsignal"
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        else:
            return self.targets[0].name
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    @property
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    def removed(self): return False # we can never remove the Signal object altogethr just the individual fsig targets
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    def remove(self):
        for t in self.targets:
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            t.remove()
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        del self.targets[:]
        
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    @property
    def f(self): return self.__f
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    @f.setter
    def f(self,value): self.__f.value = SIfloat(value)
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    def __init__(self, kat):
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        self.targets = []
        self._params = []
        self.__f = Param("f", self, 1)
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        self._kat = kat
        
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    def _register_param(self, param):
        self._params.append(param)
        
    def apply(self, target, amplitude, phase, name=None):
        
        if target == None:
            raise  pkex.BasePyKatException("No target was specified for signal to be applied")
        
        if name == None:
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            name = "sig_" + target._owner().name + "_" + target.name
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        self.targets.append(Signals.fsig(target, name, amplitude, phase, self))
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    def getFinesseText(self):
        rtn = []
        
        for t in self.targets:
            rtn.extend(t.getFinesseText())
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            rtn.append("fsig {name} {comp} {target} {frequency} {phase} {amplitude}"
                            .format(name = t.name,
                                    comp=t.owner,
                                    target=t.target,
                                    frequency=str(self.f),
                                    phase=str(t.phase),
                                    amplitude=str(t.amplitude if t.amplitude != None else "")))

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        for p in self._params:
            rtn.extend(p.getFinesseText())
        
        return rtn
        
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class Block:
    def __init__(self, name):
        self.__name = name
        self.contents = [] # List of objects and strings of finesse code
        self.enabled = True 
        
    @property
    def name(self): return self.__name
    
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Constant = namedtuple('Constant', 'name, value, usedBy')
    
class kat(object):  
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    def __init__(self, kat_file=None, kat_code=None, katdir="", katname="", tempdir=None, tempname=None):
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        cls = type(self)
        self.__class__ = type(cls.__name__, (cls,), {})
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        self.scene = None # scene object for GUI
        self.verbose = True
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        self.__blocks = OrderedDict() # dictionary of blocks that are used
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        self.__components = {}  # dictionary of optical components      
        self.__detectors = {}   # dictionary of detectors
        self.__commands = {}    # dictionary of commands
        self.__gui = None
        self.nodes = NodeNetwork(self)  
        self.__katdir = katdir
        self.__katname = katname
        self.__tempdir = tempdir
        self.__tempname = tempname
        self.pykatgui = None
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        self.__signals = Signals(self)
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        self.constants = {}
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        self.vacuum = []
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        self.__prevrunfilename = None
        self.printmatrix = None
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        # initialise default block
        self.__currentTag= NO_BLOCK
        self.__blocks[NO_BLOCK] = Block(NO_BLOCK)
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        # Various options for running finesse, typicaly the commands with just 1 input
        # and have no name attached to them.
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        self.retrace = None
        self.deriv_h = None
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        self.scale = None
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        self.__trace = None
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        self.__phase = None
        self.__maxtem = None
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        self.__noxaxis = False
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        self.__time_code = None
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        self.__yaxis = "abs" # default yaxis
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        self.__lambda0 = 1064e-9
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        if kat_code != None and kat_file != None:
            raise pkex.BasePyKatException("Specify either a Kat file or some Kat code, not both.")
        
        if kat_code != None:
            self.parseCommands(kat_code)
        
        if kat_file != None:
            self.loadKatFile(kat_file)
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    def __deepcopy__(self, memo):
        cls = self.__class__
        result = cls.__new__(cls)
        memo[id(self)] = result
        
        for k, v in self.__dict__.items():
            setattr(result, k, copy.deepcopy(v, memo))
        
        # Update any weakrefs
        for c in result.components:
            result.components[c]._Component__update_node_setters()
            
        return result
    
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    @property
    def signals(self): return self.__signals

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    yaxis_options = ["abs:deg","db:deg","re:im","abs","db","deg"]
    @property
    def yaxis(self): return self.__yaxis
    @yaxis.setter
    def yaxis(self, value):
        
        if not str(value) in self.yaxis_options:
            raise pkex.BasePyKatException("yaxis value '{0}' is not a value option. Valid options are: {1}".format(str(value), ",".join(self.yaxis_options) ))
            
        self.__yaxis = str(value)

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    @property
    def trace(self): return self.__trace
    @trace.setter
    def trace(self, value):
        value = int(value)

        if value < 0 or value > 255:
            raise pkex.BasePyKatException('trace command only accepts values in the range 0-255.')
        else:
            self.__trace = value

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    @property
    def lambda0(self): return self.__lambda0
    @lambda0.setter
    def lambda0(self, value):
        self.__lambda0 = SIfloat(value)
        
        for node in self.nodes.getNodes():
            if self.nodes[node].q != None:
                self.nodes[node].q.wavelength = self.__lambda0

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    @property
    def maxtem(self): return self.__maxtem
    @maxtem.setter
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    def maxtem(self,value):
        if value == "off":
            self.__maxtem = -1
        else:
            self.__maxtem = int(value)
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    @property
    def phase(self): return self.__phase
    @phase.setter
    def phase(self,value): self.__phase = int(value)
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    @property
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    def getPerformanceData(self): return self.__time_code
    @getPerformanceData.setter
    def getPerformanceData(self,value): self.__time_code = bool(value)
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    @property
    def components(self):
        return self.__components.copy()
    
    @property
    def detectors(self):
        return self.__detectors.copy()
        
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    @property
    def noxaxis(self): return self.__noxaxis
    @noxaxis.setter
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    def noxaxis(self,value): self.__noxaxis = bool(value) 
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    @staticmethod
    def logo():
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        print ("""                                              ..-
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    PyKat {0:7}         _                  '(
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                          \\`.|\\.__...-\"\"""-_." )
       ..+-----.._        /  ' `            .-'
   . '            `:      7/* _/._\\    \\   (
  (        '::;;+;;:      `-"' =" /,`"" `) /
  L.        \\`:::a:f            c_/     n_'
  ..`--...___`.  .    ,  
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   `^-....____:   +.      {1}\n""".format(pykat.__version__, pykat_web))
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    def loadKatFile(self, katfile, blocks=None):
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        commands=open(katfile).read()
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        self.parseCommands(commands, blocks=blocks)
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    def parseKatCode(self, code, blocks=None):
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        #commands = code.split("\n")
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        self.parseCommands(code, blocks=blocks)
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    def processConstants(self, commands):
        """
        Before fully parsing a bunch of commands firstly any constants or variables
        to be recorded and replaced.
        """
        constants = self.constants
        
        for line in commands:
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            values = line.split()
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            if len(values)>0 and values[0] == 'const':
                
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                if len(values) >= 3:
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                    if values[1] in constants:
                        raise pkex.BasePyKatException('const command with the name "{0}" already used'.format(values[1]))
                    else:
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                        constants[str(values[1])] = Constant(values[1], values[2], [])
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                else:
                    raise pkex.BasePyKatException('const command "{0}" was not the correct format'.format(line))
        
        commands_new = []
        
        for line in commands:
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            values = line.split()
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            if len(values) > 0 and values[0] != 'const':
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                # check if we have a var/constant in this line
                if line.find('$') >= 0:
                    for key in constants.keys():
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                        # TODO: need to fix this for checking mulitple instances of const in a single line
                        
                        chars = [' ', '+', '-', '*', '/', ')']

                        for c in chars:
                            none_found = False
                            
                            while not none_found:
                                if line.find('$'+key+c) > -1:
                                    constants[key].usedBy.append(line)
                                    line = line.replace('$'+key+c, str(constants[key].value)+ c)
                                else:
                                    none_found = True
                        
                        if line.endswith('$'+key):
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                            constants[key].usedBy.append(line)
                            line = line.replace('$'+key, str(constants[key].value))
                        
                commands_new.append(line)
    
        self.constants = constants
        
        return commands_new
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    def parseCommands(self, commands, blocks=None):
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        blockComment = False
        
        commands=self.remove_comments(commands)
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        commands=self.processConstants(commands)
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        after_process = [] # list of commands that should be processed after 
                           # objects have been set and created
        
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        for line in commands:
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            try:
                if len(line.strip()) >= 2:
                    line = line.strip()

                    # Looking for block start or end
                    values = line.split()
                
                    if values[0] == "%%%":
                        if values[1] == "FTblock":
                            newTag = values[2]
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                            if self.__currentTag != None and self.__currentTag != NO_BLOCK: 
                                warnings.warn("found block {0} before block {1} ended".format(newTag, self.__currentTag))    
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                            if newTag in self.__blocks:
                                raise pkex.BasePyKatException("Block `{0}` has already been read".format(newTag))
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                            self.__blocks[newTag] = Block(newTag) # create new list to store all references to components in block
                            self.__currentTag = newTag
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                        if values[1] == "FTend":
                            self.__currentTag = NO_BLOCK
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                        continue
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                    # only include listed blocks, if we have specfied them
                    if blocks != None and self.__currentTag not in blocks:
                        continue
                    
                    # don't read comment lines
                    if line[0] == "#" or line[0] == "%":
                        continue
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                    # check if block comment is being used
                    if not blockComment and line[0:2] == "/*":
                        blockComment = True
                        continue
                    elif blockComment and line[0:2] == "*/":
                        blockComment = False
                        continue
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                    first = line.split(" ",1)[0]
                    obj = None
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                    if(first == "m" or first == "m1" or first == "m2"):
                        obj = pykat.components.mirror.parseFinesseText(line)
                    elif(first == "s"):
                        obj = pykat.components.space.parseFinesseText(line)
                    elif(first == "l"):
                        obj = pykat.components.laser.parseFinesseText(line)
                    elif(first == "sq"):
                        obj = pykat.components.squeezer.parseFinesseText(line)
                    elif(first[0:2] == "bs"):
                        obj = pykat.components.beamSplitter.parseFinesseText(line)
                    elif(first[0:2] == "gr"):
                        obj = pykat.components.grating.parseFinesseText(line)
                    elif(first[0:4] == "isol"):
                        obj = pykat.components.isolator.parseFinesseText(line)
                    elif(first[0:4] == "lens"):
                        obj = pykat.components.lens.parseFinesseText(line)
                    elif(first[0:3] == "mod"):
                        obj = pykat.components.modulator.parseFinesseText(line)
                    elif(first[0:2] == "ad"):
                        obj = pykat.detectors.ad.parseFinesseText(line)
                    elif(first[0:2] == "bp"):
                        obj = pykat.detectors.bp.parseFinesseText(line)
                    elif(first[0:4] == "gouy"):
                        obj = pykat.detectors.gouy.parseFinesseText(line)
                    elif(first[0:2] == "pd" and first != "pdtype"):
                        obj = pykat.detectors.pd.parseFinesseText(line)
                    elif(first == "qshot" or first == "qshotS" or first == "qshotN"):
                        obj = pykat.detectors.qshot.parseFinesseText(line)
                    elif(first == "qnoised" or first == "qnoisedS" or first == "qnoisedN"):
                        obj = pykat.detectors.qnoised.parseFinesseText(line)
                    elif(first == "xaxis" or first == "xaxis*"):
                        obj = pykat.commands.xaxis.parseFinesseText(line)
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                    elif(first[0:2] == "hd"):
                        obj = pykat.detectors.hd.parseFinesseText(line)
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                    elif(first.startswith("qhd")):
                        obj = pykat.detectors.qhd.parseFinesseText(line)
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                    elif(first == "x2axis" or first == "x2axis*"):
                        obj = pykat.commands.x2axis.parseFinesseText(line)
                    elif(first == "gauss" or first == "gauss*" or first == "gauss**"):
                        after_process.append(line)
                    elif(first == "scale"):
                        after_process.append(line)
                    elif(first == "pdtype"):
                        after_process.append(line)
                    elif(first == "attr"):
                        after_process.append(line)
                    elif(first == "noxaxis"):
                        self.noxaxis = True
                    elif(first == "lambda"):
                        v = line.split()
                        self.lambda0 = SIfloat(v[-1])
                    elif(first == "yaxis"):
                        v = line.split()
                    
                        self.yaxis = v[-1]
                    elif(first == "phase"):
                        v = line.split()
                        if len(v) != 2:
                            raise pkex.BasePyKatException("phase command `{0}` is incorrect.".format(line))
                        else:
                            self.phase = int(v[1])
                    elif(first == "maxtem"):
                        v = line.split()
                        if len(v) != 2:
                            raise pkex.BasePyKatException("maxtem command `{0}` is incorrect.".format(line))
                        else:
                            if v[1] == "off":
                            	self.maxtem = -1
                            else:
    	                        self.maxtem = int(v[1])
                    elif(first == "trace"):
                        v = line.split()
                        if len(v) > 2:
                            raise pkex.BasePyKatException("Trace command `{0}` is incorrect.".format(line))
                        elif len(v) == 2:
                            self.trace = v[1]
                    elif(first == "retrace"):
                        v = line.split()
                        if len(v) > 2:
                            raise pkex.BasePyKatException("Retrace command `{0}` is incorrect.".format(line))
                        elif len(v) == 2:
                            self.retrace = v[1]                        
                    elif(first == "deriv_h"):
                        v = line.split()
                        if len(v) != 2:
                            raise pkex.BasePyKatException("deriv_h command `{0}` is incorrect.".format(line))
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                        else:
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                            self.deriv_h = float(v[1])
                    elif(first == "gnuterm" or first == "pyterm"):
                        if self.verbose:
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                            print ("Ignoring Gnuplot/Python terminal command '{0}'".format(line))
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                    elif(first == "fsig"):
                        after_process.append(line)
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                    elif(first == "noplot"):
                        obj = line
                        self.__blocks[self.__currentTag].contents.append(line) 
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                    else:
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                        if self.verbose:
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                            print ("Parsing `{0}` into pykat object not implemented yet, added as extra line.".format(line))
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                        obj = line
                        # manually add the line to the block contents
                        self.__blocks[self.__currentTag].contents.append(line) 
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                    if obj != None and not isinstance(obj, six.string_types):
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                        if self.hasNamedObject(obj.name):
                            getattr(self, obj.name).remove()
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                            print ("Removed existing object '{0}' of type {1} to add line '{2}'".format(obj.name, obj.__class__, line))
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                        self.add(obj)
            except:
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                print ("--------------------------------------------------------")
                print ("Error parsing line: " + line)
                print ("--------------------------------------------------------")
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                raise
                
                
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        # now process all the varous gauss/attr etc. commands which require
        # components to exist first before they can be processed
        for line in after_process:
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            first = line.split(" ",1)[0]            
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            if first == "gauss" or first == "gauss*" or first == "gauss**":
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                pykat.commands.gauss.parseFinesseText(line, self)
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            elif (first == "scale"):
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                v = line.split()
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                accepted = ["psd","psd_hf","asd","asd_hf","meter", "ampere", "degs"]
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                if len(v) == 3:
                    component_name = v[2]
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                    if v[1].lower() in accepted:
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                        val = v[1]
                    else:
                        try:
                            val = SIfloat(v[1])
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                        except ValueError as ex:
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                            raise pkex.BasePyKatException("Line `{0}`:\nAccepted scale values are decimal numbers or %s." % (line,str(accepted)))
                            
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                    if component_name in self.__detectors :
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                        self.__detectors[component_name].scale.append(val)
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                    else:
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                        raise pkex.BasePyKatException("scale command `{0}` refers to non-existing output".format(component_name))
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                elif len(v) == 2:
                    if v[1] == "meter" or v[1] == "ampere" or v[1] == "deg":
                        self.scale = v[1]
                    else:
                        self.scale = SIfloat(v[1])
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                else:
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                    raise pkex.BasePyKatException("scale command `{0}` is incorrect.".format(line))
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            elif (first == "pdtype"):
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                v = line.split()
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                if len(v) == 3:
                    component_name = v[1]
                    if component_name in self.__detectors :
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                        self.__detectors[component_name].pdtype = v[2]
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                    else:
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                        raise pkex.BasePyKatException("pdtype command `{0}` refers to non-existing detector".format(component_name))
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                else:
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                    raise pkex.BasePyKatException("pdtype command `{0}` is incorrect.".format(line))
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            elif(first == "attr"):
                v = line.split()
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                if len(v) < 4:
                    raise pkex.BasePyKatException("attr command `{0}` is incorrect.".format(line))
                else:
                    # get the component/detector in question
                    if v[1] in self.__components:
                        comp = self.__components[v[1]]
                    elif v[1] in self.__detectors:
                        comp = self.__detectors[v[1]]
                    else:
                        raise pkex.BasePyKatException("Could not find the component '{0}' for attr command in line '{1}'".format(v[1], line))
                
                    if len(v[2:]) % 2 == 1:
                        raise pkex.BasePyKatException("Attr command '{0}' must specify both parameter and value pairs".format(line))
                                                
                    # convert split list to key value pairs
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                    #kv = dict(itertools.izip_longest(*[iter(v[2:])] * 2, fillvalue=None))
                    kv = dict(izip_longest(*[iter(v[2:])] * 2, fillvalue=None))
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                    comp.parseAttributes(kv)
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            elif(first == "fsig"):
                
                v = line.split()
                
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                name = str(v[1])
                
                if v[2] not in self.__components:
                    raise pkex.BasePyKatException("Could not find the component '{0}'. Line: '{1}'".format(v[2], line))
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                comp = self.__components[v[2]]
                
                if comp._default_fsig() == None:
                    raise pkex.BasePyKatException("Component '{0}' cannot be fsig'd. Line: '{1}'".format(comp.name, line))
                    
                param = None
                amp = None
                
                if len(v) == 5:
                    param == None
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                    freq = float(v[3])
                    phase = float(v[4])
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                elif len(v) == 6:
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                    if v[3].isdigit():
                        freq = float(v[3])
                        phase = float(v[4])
                        amp = float(v[5])
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                    else:
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                        param = v[3]
                        freq = float(v[4])
                        phase = float(v[5])
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                elif len(v) == 7:
                    param = v[3]
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                    freq = float(v[4])
                    phase = float(v[5])
                    amp = float(v[6])
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                else:
                    raise pkex.BasePyKatException("'{0}' isnot a valid fsig command".format(line))
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                self.signals.apply(comp._default_fsig(), amp, phase, name)
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            else:
                raise pkex.BasePyKatException("Haven't handled parsing of '{0}'".format(line))
                    
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        self.__currentTag = NO_BLOCK 
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    def saveScript(self, filename=None):
        """
        Saves the current kat object to a Finesse input file
        """
        try:
            katScript = "".join(self.generateKatScript())       
            katfile = open(filename,'w')
            katfile.writelines(katScript)
            katfile.flush()
            katfile.close()

        except pkex.BasePyKatException as ex:
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            print (ex)
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    def getProcess(self, callback, **kwargs):
        """
        """
        
        cmd = "\n".join(self.generateKatScript())
        
        return Process(target=f__lkat_process, args=(callback, cmd, kwargs))
           
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    def run(self, printout=0, printerr=0, plot=None, save_output=False, save_kat=False, kat_name=None, cmd_args=None) :
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        """ 
        Runs the current simulation setup that has been built thus far.
        It returns a katRun or katRun2D object which is populated with the various
        data from the simulation run.
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        printout=1 prints the Finesse banner
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        printerr shows the Finesse progress (set kat.verbose=1 to see warnings and errors)
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        plot (string) - Sets gnuterm for plotting
        save_output (bool) - if true does not delete out file
        save_kat (bool) - if true does not delete kat file
        kat_name (string) - name of kat file if needed, will be randomly generated otherwise
        cmd_args (list of strings) - command line flags to pass to FINESSE
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        """
        start = datetime.datetime.now()
        
        try:        
            if not hasattr(self, "xaxis") and self.noxaxis != None and self.noxaxis == False:
                raise pkex.BasePyKatException("No xaxis was defined")
            
            if len(self.__katdir) == 0:
                # Get the environment variable for where Finesse is stored
                self.__finesse_dir = os.environ.get('FINESSE_DIR')
                
                if self.__finesse_dir == None :
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                    raise pkex.MissingFinesseEnvVar()
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            else:
                self.__finesse_dir = self.__katdir
                
            if len(self.__katname) == 0:
                katexe = "kat"
                
                if os.sys.platform == "win32":
                    katexe += ".exe"
            else:
                katexe = self.__katname
            
            kat_exec = os.path.join(self.__finesse_dir, katexe) 
            
            # check if kat file exists and it is executable by user        
            if not (os.path.isfile(kat_exec) and os.access(kat_exec, os.X_OK)):
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                raise pkex.MissingFinesse()
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            if self.verbose: print ("--------------------------------------------------------------")
            if self.verbose: print ("Running kat - Started at " + str(start))
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            if hasattr(self, "x2axis") and self.noxaxis == False:
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                r = katRun2D()
            else:
                r = katRun()
                
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            r.yaxis = self.yaxis
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            r.katScript = "".join(self.generateKatScript()) 
            
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            if (plot==None):
                # ensure we don't do any plotting. That should be handled
                # by user themselves
                r.katScript+=("gnuterm no\n")
                r.katScript+=("pyterm no\n")
            else:
                r.katScript+=(plot+"\n")
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            # create a kat file which we will write the script into
            if self.__tempname == None:
                katfile = tempfile.NamedTemporaryFile(suffix=".kat", dir=self.__tempdir)
            else:
                filepath =os.path.join(self.__tempdir, self.__tempname+".kat" )
                katfile = open( filepath, 'w' ) 
                
            katfile.writelines(r.katScript)
            katfile.flush()
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            if printout == 1 or plot != None:
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                cmd=[kat_exec]
            else:
                cmd=[kat_exec, '--perl1']
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            if self.__time_code:
                cmd.append('--perf-timing')
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            if cmd_args != None:
                cmd.extend(cmd_args)
                
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            cmd.append('--no-backspace')
            # set default format so that less repeated numbers are printed to the
            # output file, should speed up running and parsing of output files
            cmd.append('-format=%.15g')

            cmd.append(katfile.name)
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            p=subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE)