examples.exp.udts Namespace Reference

Functions
def	u_digits (cb_data)
	A handwritten code snippet to recognize an IPv4 digit 0 - 255. More...

Variables
string	title
string	pattern = 'ipv4 = %^ u_digits %d46 u_digits %d46 u_digits %d46 u_digits %$\n'
string	header = 'RESULT'
int	testno = 0
	exp = ApgExp(pattern)
string	input = '192.168.001.1'
	result = exp.exec(input)

Function Documentation

u_digits()

def examples.exp.udts.u_digits

(

cb_data

)

A handwritten code snippet to recognize an IPv4 digit 0 - 255.

Definition at line 40 of file udts.py.

Variable Documentation

exp

examples.exp.udts.exp = ApgExp(pattern)

Definition at line 64 of file udts.py.

header

string examples.exp.udts.header = 'RESULT'

Definition at line 36 of file udts.py.

input

string examples.exp.udts.input = '192.168.001.1'

Definition at line 67 of file udts.py.

pattern

string examples.exp.udts.pattern = 'ipv4 = %^ u_digits %d46 u_digits %d46 u_digits %d46 u_digits %$\n'

Definition at line 32 of file udts.py.

result

examples.exp.udts.result = exp.exec(input)

Definition at line 68 of file udts.py.

testno

int examples.exp.udts.testno = 0

Definition at line 37 of file udts.py.

title

string examples.exp.udts.title

Initial value:

=  '''This example will demonstrate how to use
handwritten code snippets to match patterns that are
difficult to describe with an SABNF grammar.
An IPv4 address is simple to describe verbally,
but the constraints on the digits are quite complicated
in the ABNF syntax. For example, with the form
xxx.xxx.xxx.xxx
xxx can be any number 0-255. However,
 - it may or may not have leading zeros
 - if three digits, the first must be <= 2
 - if 2, the second digit must be <= 5
 - if 2 and the second digit is 5 then the third must be <= 5
Straight forward verbally but not a simple ABNF problem.
Here we show a brute force the solution with a handwritten
phrase-matching terminal, an APG UDT.
'''

Definition at line 13 of file udts.py.