introom

#!/usr/bin/env python2.7
import parsley
import ometa.runtime as runtime

SIPGrammar = """
msg = firstline headers crlf body


firstline = ('\r' | '\n')* nospace:a ' ' nospace:b ' ' remaining:c
            -> parser.doFirstLine(a, b, c)

introom

class NoCSRFLoginView(View):
    def get(self, request):
        return HttpResponse("Please post your info.")

    @never_cache
    def post(self, request, authentication_form=AuthenticationForm):
        form = authentication_form(data=request.POST)
        if form.is_valid():
            # Okay, security check complete. Log the user in.

introom

useradd -d /dir_for_backup -m databackup
su - databackup
ssh-keygen -t rsa



content:
host A_Backup
hostname Server_A_Address
user root

introom

Last login: Thu Jun 20 18:27:30 on ttys000
➜  ~  kz
zsh: command not found: kz
➜  ~  ls
Applications Desktop      GradProj     Movies       Pictures     README.md    Transient
Audiu        Documents    ImpBack      Music        Projects     Temp         Twisted
Books        Downloads    Library      Persistent   Public       Tools
➜  ~  

introom

# this one works, I can repeat the expr in query {times} 
byte = anything:b -> ord(b)
query = byte:times expr{times}

# however, if the byte CANNOT return ord(b), how can I refer to the value of 'ord(anything:b)' when I am in query?
# one workaround is to store it in a temporary place.
# for example
byte = anything:b -> temp.update(b)
query = byte expr{temp.b}

introom

class Message:
    pass

class Query:
    pass

class Name:
    pass

introom

from parsley import makeGrammar

data = b'\x01\x013'

grammarSource = r"""
byte = anything:b1 anything:b2 -> ord(b1), ord(b2)
start = byte:b anything{b[0]}
"""

parser = makeGrammar(grammarSource, {})

introom

"""
byte, short and other C types are serialized in network/big endian
"""
grammarSource = r"""
byte = anything:b -> ord(b)
short = byte:high byte:low -> high << 8 | low
int = short:high short:low -> high << 16 | low

introom

https://gist.github.com/anonymous/5864002#comment-851824

introom

comment = '#' (~'\n' anything)*
hspace = ' ' | '\t' | comment
vspace =  '\r\n' | '\r' | '\n'
ws = (hspace | vspace | comment)*

emptyline = hspace* vspace
indentation = emptyline* hspace+
noindentation = emptyline* ~~~hspace

number = ws