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"""Implements functions to check identifiers."""
import re
import math
builtinKeys = globals()['__builtins__'].keys()
builtinExceptions = []
for s in builtinKeys:
if s[0].isupper():
builtinExceptions.append(s)
builtinFunctions = []
for s in builtinKeys:
if s[0].islower():
builtinFunctions.append(s)
mathFunctions = math.__dict__.keys()
def hasFormatError(id, name='Object'):
"""Check if it is a valid Python identifier."""
matchObject = re.match('([a-zA-z]|_)[a-zA-Z0-9_]*', id)
if not (matchObject and matchObject.group(0) == id):
return name + ' has a bad identifier: ' + id + '\n' +\
'Identifiers must begin with a letter or underscore and\n'+\
'be composed only of letters, digits, and underscores.'
def hasReservedWordError(id, name='Object'):
"""Ensure the identifier is not a Python reserved word."""
if id in ['and', 'as', 'assert', 'break', 'class', 'continue', 'def',
'del', 'elif', 'else', 'except', 'exec', 'finally', 'for',
'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'not',
'or', 'pass', 'print', 'raise', 'return', 'try', 'while',
'with', 'yield']:
return name + ' has a bad identifier: ' + id + '\n' +\
'That is a Python reserved word.'
def hasBuiltinConstantError(id, name='Object'):
"""Ensure the identifier is not a Python built-in constant."""
if id in ['False', 'True', 'None', 'NotImplemented', 'Ellipsis']:
return name + ' has a bad identifier: ' + id + '\n' +\
'That is a Python built-in constant.'
def hasBuiltinExceptionError(id, name='Object'):
"""Ensure the identifier is not a Python built-in exception."""
if id in builtinExceptions:
return name + ' has a bad identifier: ' + id + '\n' +\
'That is a Python built-in exception.'
def hasBuiltinFunctionError(id, name='Object'):
"""Ensure the identifier is not a Python built-in function."""
if id in builtinFunctions:
return name + ' has a bad identifier: ' + id + '\n' +\
'That is a Python built-in function.'
def hasMathError(id, name='Object'):
"""Ensure the identifier is not a Python standard math function or
constant."""
if id in mathFunctions:
return name + ' has a bad identifier: ' + id + '\n' +\
'That is a Python standard math function or constant.'
def hasSystemDefinedError(id, name='Object'):
"""Identifiers that begin and end with __ are reserved for system-defined
names."""
if len(id) >= 4 and id[0:2] == '__' and id[-2:] == '__':
return name + ' has a bad identifier: ' + id + '\n' +\
'Identifiers that begin and end with __ are reserved for\n' +\
'system-defined names.'
def hasApplicationDefinedError(id, name='Object'):
"""Identifiers that begin with __ are reserved for application-defined
names."""
if len(id) >= 2 and id[0:2] == '__':
return name + ' has a bad identifier: ' + id + '\n' +\
'Identifiers that begin and end with __ are reserved for\n' +\
'application-defined names.'
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