mirror of
https://github.com/morpheus65535/bazarr
synced 2024-12-29 02:55:52 +00:00
189 lines
6.3 KiB
Python
189 lines
6.3 KiB
Python
import pyjsparser
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import pyjsparser.parser
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from . import translating_nodes
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import hashlib
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import re
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# Enable Js2Py exceptions and pyimport in parser
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pyjsparser.parser.ENABLE_PYIMPORT = True
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# the re below is how we'll recognise numeric constants.
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# it finds any 'simple numeric that is not preceded with an alphanumeric character
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# the numeric can be a float (so a dot is found) but
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# it does not recognise notation such as 123e5, 0xFF, infinity or NaN
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CP_NUMERIC_RE = re.compile(r'(?<![a-zA-Z0-9_"\'])([0-9\.]+)')
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CP_NUMERIC_PLACEHOLDER = '__PyJsNUM_%i_PyJsNUM__'
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CP_NUMERIC_PLACEHOLDER_REVERSE_RE = re.compile(
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CP_NUMERIC_PLACEHOLDER.replace('%i', r'([0-9\.]+)'))
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# the re below is how we'll recognise string constants
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# it finds a ' or ", then reads until the next matching ' or "
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# this re only services simple cases, it can not be used when
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# there are escaped quotes in the expression
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#CP_STRING_1 = re.compile(r'(["\'])(.*?)\1') # this is how we'll recognise string constants
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CP_STRING = '"([^\\\\"]+|\\\\([bfnrtv\'"\\\\]|[0-3]?[0-7]{1,2}|x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}))*"|\'([^\\\\\']+|\\\\([bfnrtv\'"\\\\]|[0-3]?[0-7]{1,2}|x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}))*\''
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CP_STRING_RE = re.compile(
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CP_STRING) # this is how we'll recognise string constants
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CP_STRING_PLACEHOLDER = '__PyJsSTR_%i_PyJsSTR__'
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CP_STRING_PLACEHOLDER_REVERSE_RE = re.compile(
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CP_STRING_PLACEHOLDER.replace('%i', r'([0-9\.]+)'))
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cache = {}
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# This crap is still needed but I removed it for speed reasons. Have to think ofa better idea
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# import js2py.pyjs, sys
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# # Redefine builtin objects... Do you have a better idea?
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# for m in list(sys.modules):
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# if m.startswith('js2py'):
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# del sys.modules[m]
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# del js2py.pyjs
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# del js2py
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DEFAULT_HEADER = u'''from js2py.pyjs import *
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# setting scope
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var = Scope( JS_BUILTINS )
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set_global_object(var)
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# Code follows:
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'''
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def dbg(x):
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"""does nothing, legacy dummy function"""
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return ''
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def translate_js(js, HEADER=DEFAULT_HEADER, use_compilation_plan=False):
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"""js has to be a javascript source code.
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returns equivalent python code."""
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if use_compilation_plan and not '//' in js and not '/*' in js:
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return translate_js_with_compilation_plan(js, HEADER=HEADER)
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parser = pyjsparser.PyJsParser()
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parsed = parser.parse(js) # js to esprima syntax tree
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# Another way of doing that would be with my auto esprima translation but its much slower and causes import problems:
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# parsed = esprima.parse(js).to_dict()
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translating_nodes.clean_stacks()
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return HEADER + translating_nodes.trans(
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parsed) # syntax tree to python code
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class match_unumerator(object):
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"""This class ise used """
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matchcount = -1
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def __init__(self, placeholder_mask):
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self.placeholder_mask = placeholder_mask
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self.matches = []
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def __call__(self, match):
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self.matchcount += 1
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self.matches.append(match.group(0))
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return self.placeholder_mask % self.matchcount
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def __repr__(self):
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return '\n'.join(self.placeholder_mask % counter + '=' + match
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for counter, match in enumerate(self.matches))
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def wrap_up(self, output):
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for counter, value in enumerate(self.matches):
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output = output.replace(
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"u'" + self.placeholder_mask % (counter) + "'", value, 1)
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return output
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def get_compilation_plan(js):
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match_increaser_str = match_unumerator(CP_STRING_PLACEHOLDER)
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compilation_plan = re.sub(CP_STRING, match_increaser_str, js)
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match_increaser_num = match_unumerator(CP_NUMERIC_PLACEHOLDER)
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compilation_plan = re.sub(CP_NUMERIC_RE, match_increaser_num,
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compilation_plan)
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# now put quotes, note that just patching string replaces is somewhat faster than
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# using another re:
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compilation_plan = compilation_plan.replace(
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'__PyJsNUM_', '"__PyJsNUM_').replace('_PyJsNUM__', '_PyJsNUM__"')
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compilation_plan = compilation_plan.replace(
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'__PyJsSTR_', '"__PyJsSTR_').replace('_PyJsSTR__', '_PyJsSTR__"')
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return match_increaser_str, match_increaser_num, compilation_plan
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def translate_js_with_compilation_plan(js, HEADER=DEFAULT_HEADER):
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"""js has to be a javascript source code.
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returns equivalent python code.
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compile plans only work with the following restrictions:
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- only enabled for oneliner expressions
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- when there are comments in the js code string substitution is disabled
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- when there nested escaped quotes string substitution is disabled, so
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cacheable:
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Q1 == 1 && name == 'harry'
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not cacheable:
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Q1 == 1 && name == 'harry' // some comment
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not cacheable:
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Q1 == 1 && name == 'o\'Reilly'
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not cacheable:
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Q1 == 1 && name /* some comment */ == 'o\'Reilly'
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"""
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match_increaser_str, match_increaser_num, compilation_plan = get_compilation_plan(
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js)
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cp_hash = hashlib.md5(compilation_plan.encode('utf-8')).digest()
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try:
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python_code = cache[cp_hash]['proto_python_code']
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except:
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parser = pyjsparser.PyJsParser()
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parsed = parser.parse(compilation_plan) # js to esprima syntax tree
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# Another way of doing that would be with my auto esprima translation but its much slower and causes import problems:
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# parsed = esprima.parse(js).to_dict()
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translating_nodes.clean_stacks()
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python_code = translating_nodes.trans(
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parsed) # syntax tree to python code
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cache[cp_hash] = {
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'compilation_plan': compilation_plan,
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'proto_python_code': python_code,
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}
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python_code = match_increaser_str.wrap_up(python_code)
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python_code = match_increaser_num.wrap_up(python_code)
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return HEADER + python_code
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def trasnlate(js, HEADER=DEFAULT_HEADER):
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"""js has to be a javascript source code.
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returns equivalent python code.
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Equivalent to translate_js"""
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return translate_js(js, HEADER)
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syntax_tree_translate = translating_nodes.trans
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if __name__ == '__main__':
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PROFILE = False
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import js2py
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import codecs
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def main():
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with codecs.open("esprima.js", "r", "utf-8") as f:
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d = f.read()
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r = js2py.translate_js(d)
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with open('res.py', 'wb') as f2:
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f2.write(r)
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exec (r, {})
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if PROFILE:
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import cProfile
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cProfile.run('main()', sort='tottime')
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else:
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main()
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