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# Copyright (C) 2016-2022 J.F.Dockes
# 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.
# This implements a cmdtalk processor (class Processor) which expects a method name in each set of
# input parameters, under the key prcnmkey: "cmdtalk:proc". The client module creates a Dispatch
# object which it uses to record the methods to call. The message processor looks for the prcnmkey
# value and call the processing method accordingly. Example code:
#
# dispatcher = cmdtalkplugin.Dispatch()
# msgproc = cmdtalkplugin.Processor(dispatcher)
#
# @dispatcher.record('trackuri')
# def trackuri(a):
# dosomething(a)
# ....
#
# msgproc.mainloop()
import sys
import cmdtalk
prcnmkey = "cmdtalk:proc"
class Dispatch:
def __init__(self):
self.map = {}
def record(self, nm):
def decorator(func):
self.map[nm] = func
return func
return decorator
def run(self, nm, params):
func = self.map[nm]
return func(params)
class Processor:
def __init__(self, dispatcher, outfile=sys.stdout, infile=sys.stdin, exitfunc=None):
self.em = cmdtalk.CmdTalk(outfile=outfile, infile=infile, exitfunc=exitfunc)
self.dispatcher = dispatcher
def log(self, s, doexit=0, exitvalue=1):
self.em.log(s, doexit, exitvalue)
def process(self, params):
# self.em.log(f"pCmdTalkProcessor.process: [{params}]")
if not prcnmkey in params:
raise Exception(f"{prcnmkey} not in args")
return self.dispatcher.run(params[prcnmkey], params)
def mainloop(self):
cmdtalk.main(self.em, self)
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