Source code for conf_strings

#!/usr/bin/env python2
# -*- coding: utf-8 -*-
# Copyright 2012-2017 Frédéric Magniette, Miguel Rubio-Roy
# This file is part of Pyrame.
# Pyrame is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# Pyrame is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public License
# along with Pyrame.  If not, see <>

[docs]class parse: """The constructor takes a conf_string and parses it into the properties: "name" and "params". The former is a string with the name of the module receiving the conf_string. The latter is a dictionary with each of the parameters and its values. The *conf_string* is of the form:: module_name(parameter_list) *parameter_list* is of the form:: param1=value1,param2=value2,param3=value3,etc. Values are either strings or conf_string's. For example:: gpib(dst_addr=3,bus=tcp(host=,port=2300),adapter_addr=0)""" def __init__(self,conf_string): = "" self.params = {} # Extract name obj = conf_string.strip().split("(",1) if len(obj)<2: raise Exception("conf_string: error, must be of the form \"module_name(parameter_list)\"") = obj[0] if obj[1][-1]!=")": raise Exception("conf_string: error, must end with closing paretheses \")\"") # The rest are parameters params = obj[1][0:-1] # Find the first level parentheses L1 = [] counter = 0 for i,c in enumerate(params): if c=="(": counter += 1 if counter==1: L1.append(i) if c==")": counter -= 1 if counter==0: L1.append(i) if counter!=0: raise Exception("conf_string: incorrect number of closing paretheses \")\"") # Go through the detected parentheses ranges, take only what's outside them and parse for i in range(len(L1)/2+1): params_chunk = "" if len(L1)==0: # when no parentheses are present params_chunk = params elif i==0: # first chunk params_chunk = params[0:L1[2*i]] elif i==(len(L1)/2): # last chunk params_chunk = params[L1[2*i-1]+1:] else: # middle chunk params_chunk = params[L1[2*i-1]+1:L1[2*i]] #print ("params_chunk:%s"%(params_chunk)) if params_chunk=="": continue params_split = params_chunk.strip(",").split(",") for j,param in enumerate(params_split): split_equal = param.split("=",1) if len(split_equal)<2: raise Exception("conf_string: name of parameter and equal sign (=) not found") if j==len(params_split)-1 and i!=len(L1)/2: # if last of params_split but not last params_chunk, it's a compound item self.params[split_equal[0]] = split_equal[1]+params[L1[2*i]:L1[2*i+1]+1] #print("self.params[\"%s\"] = %s"%(split_equal[0],self.params[split_equal[0]])) else: self.params[split_equal[0]] = split_equal[1] #print("self.params[\"%s\"] = %s"%(split_equal[0],self.params[split_equal[0]])) def has(self,*keys): return all(k in self.params.keys() for k in list(keys))
[docs]def unparse(conf): "Take a conf_string of class conf_strings.parse and convert to string" conf_string = "%s(" % ( first = True for k in conf.params: if not first: conf_string += "," else: first = False conf_string += "%s=%s" % (k,conf.params[k]) conf_string += ")" # Parse it to be sure it doesn't contain errors parse(conf_string) return conf_string