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Initial import: Music_Server, MusicFree, catalog-sync

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2026-05-23 16:51:14 +08:00
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catalog-sync/musicdl/modules/js/youtube/__init__.py
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'''initialize'''
from .jsinterp import JSInterpreter, extractplayerjsglobalvar
catalog-sync/musicdl/modules/js/youtube/botguard.js
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catalog-sync/musicdl/modules/js/youtube/jsinterp.py
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'''
Function:
Implementation of JSInterpreter (Refer To https://pytubefix.readthedocs.io/en/latest/index.html)
Author:
Zhenchao Jin
WeChat Official Account (微信公众号):
Charles的皮卡丘
'''
import re
import json
import math
import datetime
import calendar
import operator
import itertools
import contextlib
import email.utils
import collections
from functools import update_wrapper
from contextlib import suppress as compat_contextlib_suppress
'''settings'''
DATE_FORMATS = (
'%d %B %Y', '%d %b %Y', '%B %d %Y', '%B %dst %Y', '%B %dnd %Y', '%B %drd %Y', '%B %dth %Y', '%b %d %Y', '%b %dst %Y', '%b %dnd %Y', '%b %drd %Y', '%b %dth %Y',
'%b %dst %Y %I:%M', '%b %dnd %Y %I:%M', '%b %drd %Y %I:%M', '%b %dth %Y %I:%M', '%Y %m %d', '%Y-%m-%d', '%Y.%m.%d.', '%Y/%m/%d', '%Y/%m/%d %H:%M', '%Y/%m/%d %H:%M:%S',
'%Y%m%d%H%M', '%Y%m%d%H%M%S', '%Y%m%d', '%Y-%m-%d %H:%M', '%Y-%m-%d %H:%M:%S', '%Y-%m-%d %H:%M:%S.%f', '%Y-%m-%d %H:%M:%S:%f', '%d.%m.%Y %H:%M', '%d.%m.%Y %H.%M',
'%Y-%m-%dT%H:%M:%SZ', '%Y-%m-%dT%H:%M:%S.%fZ', '%Y-%m-%dT%H:%M:%S.%f0Z', '%Y-%m-%dT%H:%M:%S', '%Y-%m-%dT%H:%M:%S.%f', '%Y-%m-%dT%H:%M', '%b %d %Y at %H:%M',
'%b %d %Y at %H:%M:%S', '%B %d %Y at %H:%M', '%B %d %Y at %H:%M:%S', '%H:%M %d-%b-%Y',
)
DATE_FORMATS_MONTH_FIRST = list(DATE_FORMATS)
DATE_FORMATS_MONTH_FIRST.extend(['%m-%d-%Y', '%m.%d.%Y', '%m/%d/%Y', '%m/%d/%y', '%m/%d/%Y %H:%M:%S'])
TIMEZONE_NAMES = {'UT': 0, 'UTC': 0, 'GMT': 0, 'Z': 0, 'AST': -4, 'ADT': -3, 'EST': -5, 'EDT': -4, 'CST': -6, 'CDT': -5, 'MST': -7, 'MDT': -6, 'PST': -8, 'PDT': -7}
DATE_FORMATS_DAY_FIRST = list(DATE_FORMATS)
DATE_FORMATS_DAY_FIRST.extend(['%d-%m-%Y', '%d.%m.%Y', '%d.%m.%y', '%d/%m/%Y', '%d/%m/%y', '%d/%m/%Y %H:%M:%S', '%d-%m-%Y %H:%M', '%H:%M %d/%m/%Y'])
'''js2json'''
def js2json(code, vars={}, *, strict=False):
# constants
STRING_QUOTES = '\'"`'
STRING_RE = '|'.join(rf'{q}(?:\\.|[^\\{q}])*{q}' for q in STRING_QUOTES)
COMMENT_RE = r'/\*(?:(?!\*/).)*?\*/|//[^\n]*\n'
SKIP_RE = fr'\s*(?:{COMMENT_RE})?\s*'
INTEGER_TABLE = ((fr'(?s)^(0[xX][0-9a-fA-F]+){SKIP_RE}:?$', 16), (fr'(?s)^(0+[0-7]+){SKIP_RE}:?$', 8))
# process escape
def processescape(match):
JSON_PASSTHROUGH_ESCAPES = R'"\bfnrtu'
escape = match.group(1) or match.group(2)
return (Rf'\{escape}' if escape in JSON_PASSTHROUGH_ESCAPES else R'\u00' if escape == 'x' else '' if escape == '\n' else escape)
# template substitute
def templatesubstitute(match):
evaluated = js2json(match.group(1), vars, strict=strict)
if evaluated[0] == '"': return json.loads(evaluated)
return evaluated
# fix kv
def fixkv(m):
v: str = m.group(0)
if v in ('true', 'false', 'null'): return v
elif v in ('undefined', 'void 0'): return 'null'
elif v.startswith('/*') or v.startswith('//') or v.startswith('!') or v == ',': return ''
if v[0] in STRING_QUOTES:
v = re.sub(r'(?s)\${([^}]+)}', templatesubstitute, v[1:-1]) if v[0] == '`' else v[1:-1]
escaped = re.sub(r'(?s)(")|\\(.)', processescape, v)
r = f'"{escaped}"'
return r
for regex, base in INTEGER_TABLE:
im = re.match(regex, v)
if im:
i = int(im.group(1), base)
return f'"{i}":' if v.endswith(':') else str(i)
if v in vars:
try:
if not strict: json.loads(vars[v])
except json.JSONDecodeError:
return json.dumps(vars[v])
else:
return vars[v]
if not strict: return f'"{v}"'
raise ValueError(f'Unknown value: {v}')
# create map
def createmap(mobj):
r = json.dumps(dict(json.loads(js2json(mobj.group(1) or '[]', vars=vars))))
return r
# process
code = re.sub(r'new Map\((\[.*?\])?\)', createmap, code)
if not strict:
code = re.sub(r'new Date\((".+")\)', r'\g<1>', code)
code = re.sub(r'new \w+\((.*?)\)', lambda m: json.dumps(m.group(0)), code)
code = re.sub(r'parseInt\([^\d]+(\d+)[^\d]+\)', r'\1', code)
code = re.sub(r'\(function\([^)]*\)\s*\{[^}]*\}\s*\)\s*\(\s*(["\'][^)]*["\'])\s*\)', r'\1', code)
# return
return re.sub(rf'''(?sx)
{STRING_RE}|
{COMMENT_RE}|,(?={SKIP_RE}[\]}}])|
void\s0|(?:(?<![0-9])[eE]|[a-df-zA-DF-Z_$])[.a-zA-Z_$0-9]*|
\b(?:0[xX][0-9a-fA-F]+|0+[0-7]+)(?:{SKIP_RE}:)?|
[0-9]+(?={SKIP_RE}:)|
!+
''', fixkv, code)
'''extracttimezone'''
def extracttimezone(date_str):
r = r'''(?x)
^.{8,}? # >=8 char non-TZ prefix, if present
(?P<tz>Z| # just the UTC Z, or
(?:(?<=.\b\d{4}|\b\d{2}:\d\d)| # preceded by 4 digits or hh:mm or
(?<!.\b[a-zA-Z]{3}|[a-zA-Z]{4}|..\b\d\d)) # not preceded by 3 alpha word or >= 4 alpha or 2 digits
[ ]? # optional space
(?P<sign>\+|-) # +/-
(?P<hours>[0-9]{2}):?(?P<minutes>[0-9]{2}) # hh[:]mm
$)
'''
m = re.search(r, date_str)
if not m:
m = re.search(r'\d{1,2}:\d{1,2}(?:\.\d+)?(?P<tz>\s*[A-Z]+)$', date_str)
timezone = TIMEZONE_NAMES.get(m and m.group('tz').strip())
if timezone is not None: date_str = date_str[:-len(m.group('tz'))]
timezone = datetime.timedelta(hours=timezone or 0)
else:
date_str = date_str[:-len(m.group('tz'))]
if not m.group('sign'): timezone = datetime.timedelta()
else:
sign = 1 if m.group('sign') == '+' else -1
timezone = datetime.timedelta(hours=sign * int(m.group('hours')), minutes=sign * int(m.group('minutes')))
return timezone, date_str
'''dateformats'''
def dateformats(day_first=True):
return DATE_FORMATS_DAY_FIRST if day_first else DATE_FORMATS_MONTH_FIRST
'''unifiedtimestamp'''
def unifiedtimestamp(date_str, day_first=True):
if not isinstance(date_str, str): return None
date_str = re.sub(r'\s+', ' ', re.sub(r'(?i)[,|]|(mon|tues?|wed(nes)?|thu(rs)?|fri|sat(ur)?)(day)?', '', date_str))
pm_delta = 12 if re.search(r'(?i)PM', date_str) else 0
timezone, date_str = extracttimezone(date_str)
date_str = re.sub(r'(?i)\s*(?:AM|PM)(?:\s+[A-Z]+)?', '', date_str)
m = re.search(r'\d{1,2}:\d{1,2}(?:\.\d+)?(?P<tz>\s*[A-Z]+)$', date_str)
if m: date_str = date_str[:-len(m.group('tz'))]
m = re.search(r'^([0-9]{4,}-[0-9]{1,2}-[0-9]{1,2}T[0-9]{1,2}:[0-9]{1,2}:[0-9]{1,2}\.[0-9]{6})[0-9]+$', date_str)
if m: date_str = m.group(1)
for expression in dateformats(day_first):
with contextlib.suppress(ValueError):
dt = datetime.datetime.strptime(date_str, expression) - timezone + datetime.timedelta(hours=pm_delta)
return calendar.timegm(dt.timetuple())
timetuple = email.utils.parsedate_tz(date_str)
if timetuple: return calendar.timegm(timetuple) + pm_delta * 3600 - timezone.total_seconds()
'''removequotes'''
def removequotes(s):
if s is None or len(s) < 2:
return s
for quote in ('"', "'",):
if s[0] == quote and s[-1] == quote:
return s[1:-1]
return s
'''truncatestring'''
def truncatestring(s, left, right=0):
assert left > 3 and right >= 0
if s is None or len(s) <= left + right:
return s
return f'{s[:left - 3]}...{s[-right:] if right else ""}'
'''jsbitop'''
def jsbitop(op):
def zeroise(x):
if x in (None, JSUndefined):
return 0
with contextlib.suppress(TypeError):
if math.isnan(x): return 0
return x
def wrapped(a, b):
return op(zeroise(a), zeroise(b)) & 0xffffffff
return wrapped
'''jsarithop'''
def jsarithop(op):
def wrapped(a, b):
if JSUndefined in (a, b): return float('nan')
return op(a or 0, b or 0)
return wrapped
'''jsdiv'''
def jsdiv(a, b):
if JSUndefined in (a, b) or not (a or b):
return float('nan')
return (a or 0) / b if b else float('inf')
'''jsmod'''
def jsmod(a, b):
if JSUndefined in (a, b) or not b:
return float('nan')
return (a or 0) % b
'''jsexp'''
def jsexp(a, b):
if not b: return 1
elif JSUndefined in (a, b): return float('nan')
return (a or 0) ** b
'''jseqop'''
def jseqop(op):
def wrapped(a, b):
if {a, b} <= {None, JSUndefined}: return op(a, a)
return op(a, b)
return wrapped
'''jscompop'''
def jscompop(op):
def wrapped(a, b):
if JSUndefined in (a, b): return False
if isinstance(a, str) or isinstance(b, str): return op(str(a or 0), str(b or 0))
return op(a or 0, b or 0)
return wrapped
'''jsternary'''
def jsternary(cndn, if_true=True, if_false=False):
if cndn in (False, None, 0, '', JSUndefined):
return if_false
with contextlib.suppress(TypeError):
if math.isnan(cndn): return if_false
return if_true
'''jstypeof'''
def jstypeof(expr):
with compat_contextlib_suppress(TypeError, KeyError):
return {JSUndefined: 'undefined', float('nan'): 'number', float('inf'): 'number', True: 'boolean', False: 'boolean', None: 'object'}[expr]
for t, n in (((str, bytes), 'string'), ((int, float, complex), 'number')):
if isinstance(expr, t): return n
if callable(expr): return 'function'
return 'object'
'''wrapsop'''
def wrapsop(op):
def updateandrenamewrapper(w):
f = update_wrapper(w, op)
f.__name__ = str('JS_') + f.__name__
return f
return updateandrenamewrapper
'''jsunaryop'''
def jsunaryop(op):
@wrapsop(op)
def wrapped(_, a):
return op(a)
return wrapped
'''extractplayerjsglobalvar'''
def extractplayerjsglobalvar(jscode):
global_var = re.search(
r'''(?x)
(?P<q1>["\'])use\s+strict(?P=q1);\s*
(?P<code>
var\s+(?P<name>[a-zA-Z0-9_$]+)\s*=\s*
(?P<value>
(?P<q2>["\'])(?:(?!(?P=q2)).|\\.)+(?P=q2)
\.split\((?P<q3>["\'])(?:(?!(?P=q3)).)+(?P=q3)\)
|\[\s*(?:(?P<q4>["\'])(?:(?!(?P=q4)).|\\.)*(?P=q4)\s*,?\s*)+\]
)
)[;,]
''', jscode)
if global_var: return global_var.group('code'), global_var.group("name"), global_var.group("value")
else: return None, None, None
'''fixupnfunctioncode'''
def fixupnfunctioncode(argnames, code, full_code):
global_var, _, _ = extractplayerjsglobalvar(full_code)
if global_var: code = global_var + '; ' + code
return argnames, re.sub(rf';\s*if\s*\(\s*typeof\s+[a-zA-Z0-9_$]+\s*===?\s*(["\'])undefined\1\s*\)\s*return\s+{argnames[0]};', ';', code)
'''NODEFAULT'''
class NODEFAULT:
pass
'''FunctionWithRepr'''
class FunctionWithRepr:
def __init__(self, func, repr_=None):
self.func, self.__repr = func, repr_
def __call__(self, *args, **kwargs):
return self.func(*args, **kwargs)
def __repr__(self):
if self.__repr:
return self.__repr
return f'{self.func.__module__}.{self.func.__qualname__}'
'''JSUndefined'''
class JSUndefined:
pass
'''JSBreak'''
class JSBreak(Exception):
def __init__(self):
Exception.__init__(self, 'Invalid break')
'''JSContinue'''
class JSContinue(Exception):
def __init__(self):
Exception.__init__(self, 'Invalid continue')
'''JSThrow'''
class JSThrow(Exception):
def __init__(self, e):
self.error = e
Exception.__init__(self, f'Uncaught exception {e}')
'''LocalNameSpace'''
class LocalNameSpace(collections.ChainMap):
def __setitem__(self, key, value):
for scope in self.maps:
if key in scope:
scope[key] = value
return
self.maps[0][key] = value
def __delitem__(self, key):
raise NotImplementedError('Deleting is not supported')
'''constants'''
_OPERATORS = {
'?': None, '??': None, '||': None, '&&': None, '|': jsbitop(operator.or_), '^': jsbitop(operator.xor), '&': jsbitop(operator.and_), '===': operator.is_,
'!==': operator.is_not, '==': jseqop(operator.eq), '!=': jseqop(operator.ne), '<=': jscompop(operator.le), '>=': jscompop(operator.ge), '<': jscompop(operator.lt),
'>': jscompop(operator.gt), '>>': jsbitop(operator.rshift), '<<': jsbitop(operator.lshift), '+': jsarithop(operator.add), '-': jsarithop(operator.sub),
'*': jsarithop(operator.mul), '%': jsmod, '/': jsdiv, '**': jsexp,
}
_UNARY_OPERATORS_X = {'void': jsunaryop(lambda _: JSUndefined), 'typeof': jsunaryop(jstypeof)}
_COMP_OPERATORS = {'===', '!==', '==', '!=', '<=', '>=', '<', '>'}
_ALL_OPERATORS = {**_OPERATORS, **_UNARY_OPERATORS_X}
_NAME_RE = r'[a-zA-Z_$][\w$]*'
_MATCHING_PARENS = dict(zip(*zip('()', '{}', '[]')))
_QUOTES = '\'"/'
_NESTED_BRACKETS = r'[^[\]]+(?:\[[^[\]]+(?:\[[^\]]+\])?\])?'
'''JSInterpreter'''
class JSInterpreter:
__named_object_counter = 0
_RE_FLAGS = {'d': 1024, 'g': 2048, 'i': re.I, 'm': re.M, 's': re.S, 'u': re.U, 'y': 4096}
def __init__(self, code, objects=None):
self.code, self._functions = code, {}
self._objects = {} if objects is None else objects
'''Exception'''
class Exception(Exception):
def __init__(self, msg, expr=None, *args, **kwargs):
if expr is not None:
msg = f'{msg.rstrip()} in: {truncatestring(expr, 50, 50)}'
super().__init__(msg, *args, **kwargs)
'''_namedobject'''
def _namedobject(self, namespace, obj):
self.__named_object_counter += 1
name = f'__pytubefix_jsinterp_obj{self.__named_object_counter}'
if callable(obj) and not isinstance(obj, FunctionWithRepr):
obj = FunctionWithRepr(obj, f'F<{self.__named_object_counter}>')
namespace[name] = obj
return name
'''_regexflags'''
@classmethod
def _regexflags(cls, expr):
flags = 0
if not expr: return flags, expr
for idx, ch in enumerate(expr):
if ch not in cls._RE_FLAGS: break
flags |= cls._RE_FLAGS[ch]
return flags, expr[idx + 1:]
'''_separate'''
@staticmethod
def _separate(expr, delim=',', max_split=None):
OP_CHARS = '+-*/%&|^=<>!,;{}:['
if not expr: return
counters = {k: 0 for k in _MATCHING_PARENS.values()}
start, splits, pos, delim_len = 0, 0, 0, len(delim) - 1
in_quote, escaping, after_op, in_regex_char_group = None, False, True, False
for idx, char in enumerate(expr):
if not in_quote and char in _MATCHING_PARENS:
counters[_MATCHING_PARENS[char]] += 1
elif not in_quote and char in counters:
if counters[char]: counters[char] -= 1
elif not escaping:
if char in _QUOTES and in_quote in (char, None):
if in_quote or after_op or char != '/': in_quote = None if in_quote and not in_regex_char_group else char
elif in_quote == '/' and char in '[]':
in_regex_char_group = char == '['
escaping = not escaping and in_quote and char == '\\'
in_unary_op = (not in_quote and not in_regex_char_group and after_op not in (True, False) and char in '-+')
after_op = char if (not in_quote and char in OP_CHARS) else (char.isspace() and after_op)
if char != delim[pos] or any(counters.values()) or in_quote or in_unary_op:
pos = 0
continue
elif pos != delim_len:
pos += 1
continue
yield expr[start: idx - delim_len]
start, pos = idx + 1, 0
splits += 1
if max_split and splits >= max_split: break
yield expr[start:]
'''_separateatparen'''
@classmethod
def _separateatparen(cls, expr, delim=None):
if delim is None:
delim = expr and _MATCHING_PARENS[expr[0]]
separated = list(cls._separate(expr, delim, 1))
if len(separated) < 2:
raise cls.Exception(f'No terminating paren {delim}', expr)
return separated[0][1:].strip(), separated[1].strip()
'''_operator'''
def _operator(self, op, left_val, right_expr, expr, local_vars, allow_recursion):
if op in ('||', '&&'):
if (op == '&&') ^ jsternary(left_val): return left_val
elif op == '??':
if left_val not in (None, JSUndefined): return left_val
elif op == '?':
right_expr = jsternary(left_val, *self._separate(right_expr, ':', 1))
right_val = self.interpretexpression(right_expr, local_vars, allow_recursion)
if not _OPERATORS.get(op): return right_val
try: return _OPERATORS[op](left_val, right_val)
except Exception as e: raise self.Exception(f'Failed to evaluate {left_val!r} {op} {right_val!r}', expr, cause=e)
'''_index'''
def _index(self, obj, idx, allow_undefined=False):
if idx == 'length': return len(obj)
try:
return obj[int(idx)] if isinstance(obj, list) else obj[idx]
except Exception as e:
if allow_undefined: return JSUndefined
raise self.Exception(f'Cannot get index {idx}', repr(obj), cause=e)
'''_dump'''
def _dump(self, obj, namespace):
try: return json.dumps(obj)
except TypeError: return self._namedobject(namespace, obj)
'''handleoperators'''
def handleoperators(self, expr, local_vars, allow_recursion):
for op in _ALL_OPERATORS:
separated = list(self._separate(expr, op))
right_expr = separated.pop()
while True:
if op in '?<>*-' and len(separated) > 1 and not separated[-1].strip(): separated.pop()
elif not (separated and op == '?' and right_expr.startswith('.')): break
right_expr = f'{op}{right_expr}'
if op != '-': right_expr = f'{separated.pop()}{op}{right_expr}'
if not separated: continue
left_val = self.interpretexpression(op.join(separated), local_vars, allow_recursion)
return self._operator(op, left_val, right_expr, expr, local_vars, allow_recursion), True
'''interpretstatement'''
def interpretstatement(self, stmt, local_vars, allow_recursion=100):
if allow_recursion < 0: raise self.Exception('Recursion limit reached')
allow_recursion -= 1
should_return = False
sub_statements = list(self._separate(stmt, ';')) or ['']
expr = stmt = sub_statements.pop().strip()
for sub_stmt in sub_statements:
ret, should_return = self.interpretstatement(sub_stmt, local_vars, allow_recursion)
if should_return: return ret, should_return
m = re.match(r'(?P<var>(?:var|const|let)\s)|return(?:\s+|(?=["\'])|$)|(?P<throw>throw\s+)', stmt)
if m:
expr = stmt[len(m.group(0)):].strip()
if m.group('throw'): raise JSThrow(self.interpretexpression(expr, local_vars, allow_recursion))
should_return = not m.group('var')
if not expr: return None, should_return
if expr[0] in _QUOTES:
inner, outer = self._separate(expr, expr[0], 1)
if expr[0] == '/':
flags, outer = self._regexflags(outer)
inner = f'{inner}/{flags}'
else:
inner = json.loads(js2json(f'{inner}{expr[0]}', strict=True))
if not outer: return inner, should_return
expr = self._namedobject(local_vars, inner) + outer
if expr.startswith('new '):
obj = expr[4:]
if obj.startswith('Date('):
left, right = self._separateatparen(obj[4:])
date = unifiedtimestamp(self.interpretexpression(left, local_vars, allow_recursion), False)
if date is None: raise self.Exception(f'Failed to parse date {left!r}', expr)
expr = self._dump(int(date * 1000), local_vars) + right
else:
raise self.Exception(f'Unsupported object {obj}', expr)
if expr.startswith('void '):
left = self.interpretexpression(expr[5:], local_vars, allow_recursion)
return None, should_return
for op in _UNARY_OPERATORS_X:
if not expr.startswith(op): continue
operand = expr[len(op):]
if not operand or operand[0] != ' ': continue
op_result = self.handleoperators(expr, local_vars, allow_recursion)
if op_result: return op_result[0], should_return
if expr.startswith('{'):
inner, outer = self._separateatparen(expr)
sub_expressions = [list(self._separate(sub_expr.strip(), ':', 1)) for sub_expr in self._separate(inner)]
if all(len(sub_expr) == 2 for sub_expr in sub_expressions):
def dictitem_func(key, val):
val = self.interpretexpression(val, local_vars, allow_recursion)
if re.match(_NAME_RE, key): return key, val
return self.interpretexpression(key, local_vars, allow_recursion), val
return dict(dictitem_func(k, v) for k, v in sub_expressions), should_return
inner, should_abort = self.interpretstatement(inner, local_vars, allow_recursion)
if not outer or should_abort:
return inner, should_abort or should_return
else:
expr = self._dump(inner, local_vars) + outer
if expr.startswith('('):
inner, outer = self._separateatparen(expr)
inner, should_abort = self.interpretstatement(inner, local_vars, allow_recursion)
if not outer or should_abort: return inner, should_abort or should_return
else: expr = self._dump(inner, local_vars) + outer
if expr.startswith('['):
inner, outer = self._separateatparen(expr)
name = self._namedobject(local_vars, [self.interpretexpression(item, local_vars, allow_recursion) for item in self._separate(inner)])
expr = name + outer
m = re.match(r'''(?x)
(?P<try>try)\s*\{|
(?P<if>if)\s*\(|
(?P<switch>switch)\s*\(|
(?P<for>for)\s*\(
''', expr)
md = m.groupdict() if m else {}
if md.get('if'):
cndn, expr = self._separateatparen(expr[m.end() - 1:])
if expr.startswith('{'): if_expr, expr = self._separateatparen(expr)
else: if_expr, expr = self._separateatparen(' %s;' % (expr,), delim=';')
else_expr = None
m = re.match(r'else\s*{', expr)
if m: else_expr, expr = self._separateatparen(expr[m.end() - 1:])
cndn = jsternary(self.interpretexpression(cndn, local_vars, allow_recursion))
ret, should_abort = self.interpretstatement(if_expr if cndn else else_expr, local_vars, allow_recursion)
if should_abort: return ret, True
if md.get('try'):
try_expr, expr = self._separateatparen(expr[m.end() - 1:])
err = None
try:
ret, should_abort = self.interpretstatement(try_expr, local_vars, allow_recursion)
if should_abort: return ret, True
except Exception as e:
err = e
pending = (None, False)
m = re.match(fr'catch\s*(?P<err>\(\s*{_NAME_RE}\s*\))?\{{', expr)
if m:
sub_expr, expr = self._separateatparen(expr[m.end() - 1:])
if err:
catch_vars = {}
if m.group('err'): catch_vars[m.group('err')] = err.error if isinstance(err, JSThrow) else err
catch_vars = local_vars.new_child(catch_vars)
err, pending = None, self.interpretstatement(sub_expr, catch_vars, allow_recursion)
m = re.match(r'finally\s*\{', expr)
if m:
sub_expr, expr = self._separateatparen(expr[m.end() - 1:])
ret, should_abort = self.interpretstatement(sub_expr, local_vars, allow_recursion)
if should_abort: return ret, True
ret, should_abort = pending
if should_abort: return ret, True
if err: raise err
elif md.get('for'):
constructor, remaining = self._separateatparen(expr[m.end() - 1:])
if remaining.startswith('{'):
body, expr = self._separateatparen(remaining)
else:
switch_m = re.match(r'switch\s*\(', remaining) # FIXME
if switch_m:
switch_val, remaining = self._separateatparen(remaining[switch_m.end() - 1:])
body, expr = self._separateatparen(remaining, '}')
body = 'switch(%s){%s}' % (switch_val, body)
else:
body, expr = remaining, ''
start, cndn, increment = self._separate(constructor, ';')
self.interpretexpression(start, local_vars, allow_recursion)
while True:
if not jsternary(self.interpretexpression(cndn, local_vars, allow_recursion)): break
try:
ret, should_abort = self.interpretstatement(body, local_vars, allow_recursion)
if should_abort: return ret, True
except JSBreak: break
except JSContinue: pass
self.interpretexpression(increment, local_vars, allow_recursion)
elif md.get('switch'):
switch_val, remaining = self._separateatparen(expr[m.end() - 1:])
switch_val = self.interpretexpression(switch_val, local_vars, allow_recursion)
body, expr = self._separateatparen(remaining, '}')
items = body.replace('default:', 'case default:').split('case ')[1:]
for default in (False, True):
matched = False
for item in items:
case, stmt = (i.strip() for i in self._separate(item, ':', 1))
if default: matched = matched or case == 'default'
elif not matched: matched = (case != 'default' and switch_val == self.interpretexpression(case, local_vars, allow_recursion))
if not matched: continue
try:
ret, should_abort = self.interpretstatement(stmt, local_vars, allow_recursion)
if should_abort: return ret
except JSBreak:
break
if matched: break
if md:
ret, should_abort = self.interpretstatement(expr, local_vars, allow_recursion)
return ret, should_abort or should_return
sub_expressions = list(self._separate(expr))
if len(sub_expressions) > 1:
for sub_expr in sub_expressions:
ret, should_abort = self.interpretstatement(sub_expr, local_vars, allow_recursion)
if should_abort: return ret, True
return ret, False
p =fr'''(?x)
(?P<out>{_NAME_RE})(?:\[(?P<index>{_NESTED_BRACKETS})\])?\s*
(?P<op>{"|".join(map(re.escape, set(_OPERATORS) - _COMP_OPERATORS))})?
=(?!=)(?P<expr>.*)$
'''
m = re.match(p, expr)
if m:
left_val = local_vars.get(m.group('out'))
if not m.group('index'):
local_vars[m.group('out')] = self._operator(m.group('op'), left_val, m.group('expr'), expr, local_vars, allow_recursion)
return local_vars[m.group('out')], should_return
elif left_val in (None, JSUndefined):
raise self.Exception(f'Cannot index undefined variable {m.group("out")}', expr)
idx = self.interpretexpression(m.group('index'), local_vars, allow_recursion)
if not isinstance(idx, (int, float)): raise self.Exception(f'List index {idx} must be integer', expr)
idx = int(idx)
left_val[idx] = self._operator(m.group('op'), self._index(left_val, idx), m.group('expr'), expr, local_vars, allow_recursion)
return left_val[idx], should_return
for m in re.finditer(rf'''(?x)
(?P<pre_sign>\+\+|--)(?P<var1>{_NAME_RE})|
(?P<var2>{_NAME_RE})(?P<post_sign>\+\+|--)''', expr):
var = m.group('var1') or m.group('var2')
start, end = m.span()
sign = m.group('pre_sign') or m.group('post_sign')
ret = local_vars[var]
local_vars[var] += 1 if sign[0] == '+' else -1
if m.group('pre_sign'): ret = local_vars[var]
expr = expr[:start] + self._dump(ret, local_vars) + expr[end:]
if not expr: return None, should_return
m = re.match(fr'''(?x)
(?P<assign>
(?P<out>{_NAME_RE})(?:\[(?P<index>{_NESTED_BRACKETS})\])?\s*
(?P<op>{"|".join(map(re.escape, set(_OPERATORS) - _COMP_OPERATORS))})?
=(?!=)(?P<expr>.*)$
)|(?P<return>
(?!if|return|true|false|null|undefined|NaN)(?P<name>{_NAME_RE})$
)|(?P<attribute>
(?P<var>{_NAME_RE})(?:
(?P<nullish>\?)?\.(?P<member>[^(]+)|
\[(?P<member2>{_NESTED_BRACKETS})\]
)\s*
)|(?P<indexing>
(?P<in>{_NAME_RE})\[(?P<idx>.+)\]$
)|(?P<function>
(?P<fname>{_NAME_RE})\((?P<args>.*)\)$
)''', expr)
if m and m.group('assign'):
left_val = local_vars.get(m.group('out'))
if not m.group('index'):
local_vars[m.group('out')] = self._operator(m.group('op'), left_val, m.group('expr'), expr, local_vars, allow_recursion)
return local_vars[m.group('out')], should_return
elif left_val in (None, JSUndefined):
raise self.Exception(f'Cannot index undefined variable {m.group("out")}', expr)
idx = self.interpretexpression(m.group('index'), local_vars, allow_recursion)
if not isinstance(idx, (int, float)):
raise self.Exception(f'List index {idx} must be integer', expr)
idx = int(idx)
left_val[idx] = self._operator(m.group('op'), self._index(left_val, idx), m.group('expr'), expr, local_vars, allow_recursion)
return left_val[idx], should_return
elif expr.isdigit():
return int(expr), should_return
elif expr == 'break':
raise JSBreak()
elif expr == 'continue':
raise JSContinue()
elif expr == 'undefined':
return JSUndefined, should_return
elif expr == 'NaN':
return float('NaN'), should_return
elif m and m.group('return'):
try:
return local_vars[m.group('name')], should_return
except KeyError as e:
return self.extractglobalvar(e.args[0]), should_return
with contextlib.suppress(ValueError):
return json.loads(js2json(expr, strict=True)), should_return
if m and m.group('indexing'):
val = local_vars[m.group('in')]
idx = self.interpretexpression(m.group('idx'), local_vars, allow_recursion)
return self._index(val, idx), should_return
op_result = self.handleoperators(expr, local_vars, allow_recursion)
if op_result: return op_result[0], should_return
if m and m.group('attribute'):
variable, member, nullish = m.group('var', 'member', 'nullish')
if not member: member = self.interpretexpression(m.group('member2'), local_vars, allow_recursion)
arg_str = expr[m.end():]
if arg_str.startswith('('): arg_str, remaining = self._separateatparen(arg_str)
else: arg_str, remaining = None, arg_str
def assertion(cndn, msg):
if not cndn: raise self.Exception(f'{member} {msg}', expr)
def evalmethod_func():
nonlocal member
types = {'String': str, 'Math': float, 'Array': list}
obj = local_vars.get(variable, types.get(variable, NODEFAULT))
if obj is NODEFAULT:
if variable not in self._objects:
try:
self._objects[variable] = self.extractobject(variable, local_vars)
except self.Exception:
if not nullish: raise Exception
obj = self._objects.get(variable, JSUndefined)
if nullish and obj is JSUndefined: return JSUndefined
if arg_str is None: return self._index(obj, member, nullish)
argvals = [self.interpretexpression(v, local_vars, allow_recursion) for v in self._separate(arg_str)]
if isinstance(obj, type) and member.startswith('prototype.'):
new_member, _, func_prototype = member.partition('.')[2].partition('.')
assertion(argvals, 'takes one or more arguments')
assertion(isinstance(argvals[0], obj), f'needs binding to type {obj}')
if func_prototype == 'call':
obj, *argvals = argvals
elif func_prototype == 'apply':
assertion(len(argvals) == 2, 'takes two arguments')
obj, argvals = argvals
assertion(isinstance(argvals, list), 'second argument needs to be a list')
else:
raise self.Exception(f'Unsupported Function method {func_prototype}', expr)
member = new_member
if obj == str:
if member == 'fromCharCode':
assertion(argvals, 'takes one or more arguments')
return ''.join(map(chr, argvals))
raise self.Exception(f'Unsupported String method {member}', expr)
elif obj == float:
if member == 'pow':
assertion(len(argvals) == 2, 'takes two arguments')
return argvals[0] ** argvals[1]
raise self.Exception(f'Unsupported Math method {member}', expr)
if member == 'split':
assertion(argvals, 'takes one or more arguments')
assertion(len(argvals) == 1, 'with limit argument is not implemented')
return obj.split(argvals[0]) if argvals[0] else list(obj)
elif member == 'join':
assertion(isinstance(obj, list), 'must be applied on a list')
assertion(len(argvals) == 1, 'takes exactly one argument')
return argvals[0].join(obj)
elif member == 'reverse':
assertion(not argvals, 'does not take any arguments')
obj.reverse()
return obj
elif member == 'slice':
assertion(isinstance(obj, (list, str)), 'must be applied on a list or string')
assertion(len(argvals) <= 2, 'takes between 0 and 2 arguments')
return obj[slice(*argvals, None)]
elif member == 'splice':
assertion(isinstance(obj, list), 'must be applied on a list')
assertion(argvals, 'takes one or more arguments')
index, howMany = map(int, (argvals + [len(obj)])[:2])
if index < 0:
index += len(obj)
add_items = argvals[2:]
res = []
for i in range(index, min(index + howMany, len(obj))):
res.append(obj.pop(index))
for i, item in enumerate(add_items):
obj.insert(index + i, item)
return res
elif member == 'unshift':
assertion(isinstance(obj, list), 'must be applied on a list')
assertion(argvals, 'takes one or more arguments')
for item in reversed(argvals): obj.insert(0, item)
return obj
elif member == 'pop':
assertion(isinstance(obj, list), 'must be applied on a list')
assertion(not argvals, 'does not take any arguments')
if not obj: return
return obj.pop()
elif member == 'push':
assertion(argvals, 'takes one or more arguments')
obj.extend(argvals)
return obj
elif member == 'forEach':
assertion(argvals, 'takes one or more arguments')
assertion(len(argvals) <= 2, 'takes at-most 2 arguments')
f, this = (argvals + [''])[:2]
return [f((item, idx, obj), {'this': this}, allow_recursion) for idx, item in enumerate(obj)]
elif member == 'indexOf':
assertion(argvals, 'takes one or more arguments')
assertion(len(argvals) <= 2, 'takes at-most 2 arguments')
idx, start = (argvals + [0])[:2]
try: return obj.index(idx, start)
except ValueError: return -1
elif member == 'charCodeAt':
assertion(isinstance(obj, str), 'must be applied on a string')
assertion(len(argvals) == 1, 'takes exactly one argument')
idx = argvals[0] if isinstance(argvals[0], int) else 0
if idx >= len(obj): return None
return ord(obj[idx])
idx = int(member) if isinstance(obj, list) else member
return obj[idx](argvals, allow_recursion=allow_recursion)
if remaining:
ret, should_abort = self.interpretstatement(self._namedobject(local_vars, evalmethod_func()) + remaining, local_vars, allow_recursion)
return ret, should_return or should_abort
else:
return evalmethod_func(), should_return
elif m and m.group('function'):
fname = m.group('fname')
argvals = [self.interpretexpression(v, local_vars, allow_recursion) for v in self._separate(m.group('args'))]
if fname in local_vars:
return local_vars[fname](argvals, allow_recursion=allow_recursion), should_return
elif fname not in self._functions:
self._functions[fname] = self.extractfunction(fname)
return self._functions[fname](argvals, allow_recursion=allow_recursion), should_return
raise self.Exception(f'Unsupported JS expression {truncatestring(expr, 20, 20) if expr != stmt else ""}', stmt)
'''interpretexpression'''
def interpretexpression(self, expr, local_vars, allow_recursion):
ret, should_return = self.interpretstatement(expr, local_vars, allow_recursion)
if should_return: raise self.Exception('Cannot return from an expression', expr)
return ret
'''extractglobalvar'''
def extractglobalvar(self, var):
global_var = re.search(fr'''var\s?{re.escape(var)}=(?P<val>.*?);''', self.code)
code = global_var.group('val')
return code
'''extractobject'''
def extractobject(self, objname, *global_stack):
_FUNC_NAME_RE = r'''(?:[a-zA-Z$0-9]+|"[a-zA-Z$0-9]+"|'[a-zA-Z$0-9]+')'''
obj = {}
obj_m = re.search(
r'''(?x)
(?<![a-zA-Z$0-9.])%s\s*=\s*{\s*
(?P<fields>(%s\s*:\s*function\s*\(.*?\)\s*{.*?}(?:,\s*)?)*)
}\s*;
''' % (re.escape(objname), _FUNC_NAME_RE), self.code)
if not obj_m: raise self.Exception(f'Could not find object {objname}')
fields = obj_m.group('fields')
fields_m = re.finditer(
r'''(?x)
(?P<key>%s)\s*:\s*function\s*\((?P<args>(?:%s|,)*)\){(?P<code>[^}]+)}
''' % (_FUNC_NAME_RE, _NAME_RE), fields)
for f in fields_m:
argnames = f.group('args').split(',')
name = removequotes(f.group('key'))
obj[name] = FunctionWithRepr(self.buildfunction(argnames, f.group('code'), *global_stack), f'F<{name}>')
return obj
'''extractfunctioncode'''
def extractfunctioncode(self, funcname):
func_m = re.search(
r'''(?xs)
(?:
function\s+%(name)s|
[{;,]\s*%(name)s\s*=\s*function|
(?:var|const|let)\s+%(name)s\s*=\s*function
)\s*
\((?P<args>[^)]*)\)\s*
(?P<code>{.+})''' % {'name': re.escape(funcname)}, self.code)
if func_m is None: raise self.Exception(f'Could not find JS function "{funcname}"')
code, _ = self._separateatparen(func_m.group('code'))
return [x.strip() for x in func_m.group('args').split(',')], code
'''extractfunction'''
def extractfunction(self, funcname):
return FunctionWithRepr(self.extractfunctionfromcode(*fixupnfunctioncode(*self.extractfunctioncode(funcname), self.code)), f'F<{funcname}>')
'''extractfunctionfromcode'''
def extractfunctionfromcode(self, argnames, code, *global_stack):
local_vars = {}
while True:
mobj = re.search(r'function\((?P<args>[^)]*)\)\s*{', code)
if mobj is None: break
start, body_start = mobj.span()
body, remaining = self._separateatparen(code[body_start - 1:])
name = self._namedobject(local_vars, self.extractfunctionfromcode([x.strip() for x in mobj.group('args').split(',')], body, local_vars, *global_stack))
code = code[:start] + name + remaining
return self.buildfunction(argnames, code, local_vars, *global_stack)
'''callfunction'''
def callfunction(self, funcname, *args):
return self.extractfunction(funcname)(args)
'''buildfunction'''
def buildfunction(self, argnames, code, *global_stack):
global_stack = list(global_stack) or [{}]
argnames = tuple(argnames)
def resf(args, kwargs={}, allow_recursion=100):
global_stack[0].update(itertools.zip_longest(argnames, args, fillvalue=None))
global_stack[0].update(kwargs)
var_stack = LocalNameSpace(*global_stack)
ret, should_abort = self.interpretstatement(code.replace('\n', ' '), var_stack, allow_recursion - 1)
if should_abort: return ret
return resf
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