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100 lines
3.9 KiB
Python
100 lines
3.9 KiB
Python
"""This module removes JS functions from source code"""
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from __future__ import print_function
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from jsparser import *
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from utils import *
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INLINE_NAME = 'PyJsLvalInline%d_'
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INLINE_COUNT = 0
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PRE_EXP_STARTS = {
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'return', 'new', 'void', 'throw', 'typeof', 'in', 'instanceof'
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}
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PRE_ALLOWED = IDENTIFIER_PART.union({';', '{', '}', ']', ')', ':'})
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INCREMENTS = {'++', '--'}
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def reset_inline_count():
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global INLINE_COUNT
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INLINE_COUNT = 0
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def remove_functions(source, all_inline=False):
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"""removes functions and returns new source, and 2 dicts.
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first dict with removed hoisted(global) functions and second with replaced inline functions"""
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global INLINE_COUNT
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inline = {}
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hoisted = {}
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n = 0
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limit = len(source) - 9 # 8 is length of 'function'
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res = ''
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last = 0
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while n < limit:
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if n and source[n - 1] in IDENTIFIER_PART:
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n += 1
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continue
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if source[n:n + 8] == 'function' and source[n +
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8] not in IDENTIFIER_PART:
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if source[:n].rstrip().endswith(
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'.'): # allow function as a property name :)
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n += 1
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continue
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if source[n + 8:].lstrip().startswith(
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':'): # allow functions inside objects...
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n += 1
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continue
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entered = n
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res += source[last:n]
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name = ''
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n = pass_white(source, n + 8)
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if source[n] in IDENTIFIER_START: # hoisted function
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name, n = parse_identifier(source, n)
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args, n = pass_bracket(source, n, '()')
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if not args:
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raise SyntaxError('Function misses bracket with argnames ()')
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args = args.strip('() \n')
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args = tuple(parse_identifier(e, 0)[0]
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for e in argsplit(args)) if args else ()
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if len(args) - len(set(args)):
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# I know its legal in JS but python does not allow duplicate argnames
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# I will not work around it
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raise SyntaxError(
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'Function has duplicate argument names. Its not legal in this implementation. Sorry.'
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)
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block, n = pass_bracket(source, n, '{}')
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if not block:
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raise SyntaxError(
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'Function does not have any code block to execute')
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mixed = False # named function expression flag
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if name and not all_inline:
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# Here I will distinguish between named function expression (mixed) and a function statement
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before = source[:entered].rstrip()
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if any(endswith_keyword(before, e) for e in PRE_EXP_STARTS):
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#print 'Ended ith keyword'
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mixed = True
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elif before and before[-1] not in PRE_ALLOWED and not before[
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-2:] in INCREMENTS:
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#print 'Ended with'+repr(before[-1]), before[-1]=='}'
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mixed = True
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else:
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#print 'FUNCTION STATEMENT'
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#its a function statement.
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# todo remove fucking label if present!
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hoisted[name] = block, args
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if not name or mixed or all_inline: # its a function expression (can be both named and not named)
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#print 'FUNCTION EXPRESSION'
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INLINE_COUNT += 1
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iname = INLINE_NAME % INLINE_COUNT # inline name
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res += ' ' + iname
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inline['%s@%s' % (
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iname, name
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)] = block, args #here added real name at the end because it has to be added to the func scope
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last = n
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else:
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n += 1
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res += source[last:]
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return res, hoisted, inline
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if __name__ == '__main__':
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print(remove_functions(
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'5+5 function n (functiona ,functionaj) {dsd s, dsdd}'))
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