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85 lines
3.1 KiB
Python
85 lines
3.1 KiB
Python
"""
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exp_translate routine:
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It takes a single line of JS code and returns a SINGLE line of Python code.
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Note var is not present here because it was removed in previous stages. Also remove this useless void keyword
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If case of parsing errors it must return a pos of error.
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1. Convert all assignment operations to put operations, this may be hard :( DONE, wasn't that bad
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2. Convert all gets and calls to get and callprop.
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3. Convert unary operators like typeof, new, !, delete, ++, --
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Delete can be handled by replacing last get method with delete.
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4. Convert remaining operators that are not handled by python:
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&&, || <= these should be easy simply replace && by and and || by or
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=== and !==
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comma operator , in, instanceof and finally :?
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NOTES:
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Strings and other literals are not present so each = means assignment
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"""
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from __future__ import print_function
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from utils import *
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from jsparser import *
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def exps_translator(js):
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#Check () {} and [] nums
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ass = assignment_translator(js)
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# Step 1
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def assignment_translator(js):
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sep = js.split(',')
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res = sep[:]
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for i, e in enumerate(sep):
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if '=' not in e: # no need to convert
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continue
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res[i] = bass_translator(e)
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return ','.join(res)
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def bass_translator(s):
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# I hope that I will not have to fix any bugs here because it will be terrible
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if '(' in s or '[' in s:
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converted = ''
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for e in bracket_split(s, ['()', '[]'], strip=False):
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if e[0] == '(':
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converted += '(' + bass_translator(e[1:-1]) + ')'
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elif e[0] == '[':
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converted += '[' + bass_translator(e[1:-1]) + ']'
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else:
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converted += e
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s = converted
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if '=' not in s:
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return s
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ass = reversed(s.split('='))
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last = ass.next()
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res = last
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for e in ass:
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op = ''
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if e[-1] in OP_METHODS: #increment assign like +=
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op = ', "' + e[-1] + '"'
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e = e[:-1]
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cand = e.strip(
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'() ') # (a) = 40 is valid so we need to transform '(a) ' to 'a'
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if not is_property_accessor(cand): # it is not a property assignment
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if not is_lval(cand) or is_internal(cand):
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raise SyntaxError('Invalid left-hand side in assignment')
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res = 'var.put(%s, %s%s)' % (cand.__repr__(), res, op)
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elif cand[-1] == ']': # property assignment via []
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c = list(bracket_split(cand, ['[]'], strip=False))
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meth, prop = ''.join(c[:-1]).strip(), c[-1][1:-1].strip(
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) #this does not have to be a string so dont remove
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#() because it can be a call
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res = '%s.put(%s, %s%s)' % (meth, prop, res, op)
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else: # Prop set via '.'
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c = cand.rfind('.')
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meth, prop = cand[:c].strip(), cand[c + 1:].strip('() ')
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if not is_lval(prop):
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raise SyntaxError('Invalid left-hand side in assignment')
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res = '%s.put(%s, %s%s)' % (meth, prop.__repr__(), res, op)
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return res
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if __name__ == '__main__':
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print(bass_translator('3.ddsd = 40'))
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