import inspect
import os, re

def LineNumber():
	return inspect.currentframe().f_back.f_lineno
	
def ReConvert(expression):
	classes = [
		'[:alnum:]', 
		'[:alpha:]', 
		'[:digit:]', 
		'[:word:]', 
		'[:xdigit:]', 
		'[:upper:]', 
		'[:space:]', 
		'[:lower:]', 
		'[:blank:]']
	
	equivs = [
		'a-zA-Z0-9',
		'a-zA-Z',
		'0-9',
		'A-Za-z0-9_',
		'A-Fa-f0-9',
		'A-Z',
		' \t\r\n\v\f',
		'a-z',
		' \t']
		
	for i in range(len(classes)):
		expression = expression.replace(classes[i], equivs[i])
	
	return expression
		
def FileExists(file):
	if file == None:
		return False
	return os.path.exists(file)
	

def Matches(pattern, value):
	pattern = ReConvert(pattern)
	p = re.compile(pattern)
	m = p.search(value)
	
	if m == None:
		return False
	
	return True
	
def CoerseBool(val):
	
	true_values = ['True', 'true', 't', '1', 1, True]
	
	for v in true_values:
		if val == v:
			return True

	return False