from .utils import (
NO_DEFAULT,
ExtractorError,
+ function_with_repr,
js_to_json,
remove_quotes,
truncate_string,
def _js_bit_op(op):
+ def zeroise(x):
+ if x in (None, JS_Undefined):
+ return 0
+ with contextlib.suppress(TypeError):
+ if math.isnan(x): # NB: NaN cannot be checked by membership
+ return 0
+ return x
+
def wrapped(a, b):
- def zeroise(x):
- return 0 if x in (None, JS_Undefined) else x
- return op(zeroise(a), zeroise(b))
+ return op(zeroise(a), zeroise(b)) & 0xffffffff
return wrapped
def _js_div(a, b):
- if JS_Undefined in (a, b) or not (a and b):
+ if JS_Undefined in (a, b) or not (a or b):
return float('nan')
return (a or 0) / b if b else float('inf')
def wrapped(a, b):
if JS_Undefined 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
'-': _js_arith_op(operator.sub),
'*': _js_arith_op(operator.mul),
- '/': _js_div,
'%': _js_mod,
+ '/': _js_div,
'**': _js_exp,
}
cls.write('=> Raises:', e, '<-|', stmt, level=allow_recursion)
raise
if cls.ENABLED and stmt.strip():
- cls.write(['->', '=>'][should_ret], repr(ret), '<-|', stmt, level=allow_recursion)
+ if should_ret or repr(ret) != stmt:
+ cls.write(['->', '=>'][should_ret], repr(ret), '<-|', stmt, level=allow_recursion)
return ret, should_ret
return interpret_statement
'y': 4096, # Perform a "sticky" search that matches starting at the current position in the target string
}
- _EXC_NAME = '__yt_dlp_exception__'
-
def __init__(self, code, objects=None):
self.code, self._functions = code, {}
self._objects = {} if objects is None else objects
- class Exception(ExtractorError):
+ class Exception(ExtractorError): # noqa: A001
def __init__(self, msg, expr=None, *args, **kwargs):
if expr is not None:
msg = f'{msg.rstrip()} in: {truncate_string(expr, 50, 50)}'
def _named_object(self, namespace, obj):
self.__named_object_counter += 1
name = f'__yt_dlp_jsinterp_obj{self.__named_object_counter}'
+ if callable(obj) and not isinstance(obj, function_with_repr):
+ obj = function_with_repr(obj, f'F<{self.__named_object_counter}>')
namespace[name] = obj
return name
flags = 0
if not expr:
return flags, expr
- for idx, ch in enumerate(expr):
+ for idx, ch in enumerate(expr): # noqa: B007
if ch not in cls._RE_FLAGS:
break
flags |= cls._RE_FLAGS[ch]
@staticmethod
def _separate(expr, delim=',', max_split=None):
- OP_CHARS = '+-*/%&|^=<>!,;{}:'
+ OP_CHARS = '+-*/%&|^=<>!,;{}:['
if not expr:
return
counters = {k: 0 for k in _MATCHING_PARENS.values()}
if not in_quote and char in _MATCHING_PARENS:
counters[_MATCHING_PARENS[char]] += 1
elif not in_quote and char in counters:
- counters[char] -= 1
- elif not escaping and 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 == '['
+ # Something's wrong if we get negative, but ignore it anyway
+ 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 == '\\'
- after_op = not in_quote and char in OP_CHARS or (char.isspace() and after_op)
+ 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:
+ if char != delim[pos] or any(counters.values()) or in_quote or in_unary_op:
pos = 0
continue
elif pos != delim_len:
yield expr[start:]
@classmethod
- def _separate_at_paren(cls, expr, delim):
+ def _separate_at_paren(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)
inner, outer = self._separate(expr, expr[0], 1)
if expr[0] == '/':
flags, outer = self._regex_flags(outer)
- inner = re.compile(inner[1:], flags=flags)
+ # We don't support regex methods yet, so no point compiling it
+ inner = f'{inner}/{flags}'
+ # Avoid https://github.com/python/cpython/issues/74534
+ # inner = re.compile(inner[1:].replace('[[', r'[\['), flags=flags)
else:
inner = json.loads(js_to_json(f'{inner}{expr[0]}', strict=True))
if not outer:
if expr.startswith('new '):
obj = expr[4:]
if obj.startswith('Date('):
- left, right = self._separate_at_paren(obj[4:], ')')
- expr = unified_timestamp(
+ left, right = self._separate_at_paren(obj[4:])
+ date = unified_timestamp(
self.interpret_expression(left, local_vars, allow_recursion), False)
- if not expr:
+ if date is None:
raise self.Exception(f'Failed to parse date {left!r}', expr)
- expr = self._dump(int(expr * 1000), local_vars) + right
+ expr = self._dump(int(date * 1000), local_vars) + right
else:
raise self.Exception(f'Unsupported object {obj}', expr)
return None, should_return
if expr.startswith('{'):
- inner, outer = self._separate_at_paren(expr, '}')
- # Look for Map first
+ inner, outer = self._separate_at_paren(expr)
+ # try for object expression (Map)
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 dict_item(key, val):
expr = self._dump(inner, local_vars) + outer
if expr.startswith('('):
- inner, outer = self._separate_at_paren(expr, ')')
+ inner, outer = self._separate_at_paren(expr)
inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion)
if not outer or should_abort:
return inner, should_abort or should_return
expr = self._dump(inner, local_vars) + outer
if expr.startswith('['):
- inner, outer = self._separate_at_paren(expr, ']')
+ inner, outer = self._separate_at_paren(expr)
name = self._named_object(local_vars, [
self.interpret_expression(item, local_vars, allow_recursion)
for item in self._separate(inner)])
expr = name + outer
- m = re.match(rf'''(?x)
- (?P<try>try|finally)\s*|
- (?P<catch>catch\s*(?P<err>\(\s*{_NAME_RE}\s*\)))|
- (?P<switch>switch)\s*\(|
- (?P<for>for)\s*\(|''', expr)
- if m and m.group('try'):
- if expr[m.end()] == '{':
- try_expr, expr = self._separate_at_paren(expr[m.end():], '}')
- else:
- try_expr, expr = expr[m.end() - 1:], ''
+ 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._separate_at_paren(expr[m.end() - 1:])
+ if_expr, expr = self._separate_at_paren(expr.lstrip())
+ # TODO: "else if" is not handled
+ else_expr = None
+ m = re.match(r'else\s*{', expr)
+ if m:
+ else_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
+ cndn = _js_ternary(self.interpret_expression(cndn, local_vars, allow_recursion))
+ ret, should_abort = self.interpret_statement(
+ 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._separate_at_paren(expr[m.end() - 1:])
+ err = None
try:
ret, should_abort = self.interpret_statement(try_expr, local_vars, allow_recursion)
if should_abort:
return ret, True
- except JS_Throw as e:
- local_vars[self._EXC_NAME] = e.error
except Exception as e:
# XXX: This works for now, but makes debugging future issues very hard
- local_vars[self._EXC_NAME] = e
- ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
- return ret, should_abort or should_return
-
- elif m and m.group('catch'):
- catch_expr, expr = self._separate_at_paren(expr[m.end():], '}')
- if self._EXC_NAME in local_vars:
- catch_vars = local_vars.new_child({m.group('err'): local_vars.pop(self._EXC_NAME)})
- ret, should_abort = self.interpret_statement(catch_expr, catch_vars, allow_recursion)
+ err = e
+
+ pending = (None, False)
+ m = re.match(fr'catch\s*(?P<err>\(\s*{_NAME_RE}\s*\))?\{{', expr)
+ if m:
+ sub_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
+ if err:
+ catch_vars = {}
+ if m.group('err'):
+ catch_vars[m.group('err')] = err.error if isinstance(err, JS_Throw) else err
+ catch_vars = local_vars.new_child(catch_vars)
+ err, pending = None, self.interpret_statement(sub_expr, catch_vars, allow_recursion)
+
+ m = re.match(r'finally\s*\{', expr)
+ if m:
+ sub_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
+ ret, should_abort = self.interpret_statement(sub_expr, local_vars, allow_recursion)
if should_abort:
return ret, True
- ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
- return ret, should_abort or should_return
+ ret, should_abort = pending
+ if should_abort:
+ return ret, True
+
+ if err:
+ raise err
- elif m and m.group('for'):
- constructor, remaining = self._separate_at_paren(expr[m.end() - 1:], ')')
+ elif md.get('for'):
+ constructor, remaining = self._separate_at_paren(expr[m.end() - 1:])
if remaining.startswith('{'):
- body, expr = self._separate_at_paren(remaining, '}')
+ body, expr = self._separate_at_paren(remaining)
else:
- switch_m = re.match(r'switch\s*\(', remaining) # FIXME
+ switch_m = re.match(r'switch\s*\(', remaining) # FIXME: ?
if switch_m:
- switch_val, remaining = self._separate_at_paren(remaining[switch_m.end() - 1:], ')')
+ switch_val, remaining = self._separate_at_paren(remaining[switch_m.end() - 1:])
body, expr = self._separate_at_paren(remaining, '}')
body = 'switch(%s){%s}' % (switch_val, body)
else:
except JS_Continue:
pass
self.interpret_expression(increment, local_vars, allow_recursion)
- ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
- return ret, should_abort or should_return
- elif m and m.group('switch'):
- switch_val, remaining = self._separate_at_paren(expr[m.end() - 1:], ')')
+ elif md.get('switch'):
+ switch_val, remaining = self._separate_at_paren(expr[m.end() - 1:])
switch_val = self.interpret_expression(switch_val, local_vars, allow_recursion)
body, expr = self._separate_at_paren(remaining, '}')
items = body.replace('default:', 'case default:').split('case ')[1:]
break
if matched:
break
+
+ if md:
ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
return ret, should_abort or should_return
return int(expr), should_return
elif expr == 'break':
- raise JS_Break()
+ raise JS_Break
elif expr == 'continue':
- raise JS_Continue()
+ raise JS_Continue
elif expr == 'undefined':
return JS_Undefined, should_return
elif expr == 'NaN':
member = self.interpret_expression(m.group('member2'), local_vars, allow_recursion)
arg_str = expr[m.end():]
if arg_str.startswith('('):
- arg_str, remaining = self._separate_at_paren(arg_str, ')')
+ arg_str, remaining = self._separate_at_paren(arg_str)
else:
arg_str, remaining = None, arg_str
self.interpret_expression(v, local_vars, allow_recursion)
for v in self._separate(arg_str)]
- if obj == str:
+ if obj is 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:
+ elif obj is float:
if member == 'pow':
assertion(len(argvals) == 2, 'takes two arguments')
return argvals[0] ** argvals[1]
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])
+ index, how_many = 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))):
+ for _ in range(index, min(index + how_many, len(obj))):
res.append(obj.pop(index))
for i, item in enumerate(add_items):
obj.insert(index + i, item)
elif member == 'forEach':
assertion(argvals, 'takes one or more arguments')
assertion(len(argvals) <= 2, 'takes at-most 2 arguments')
- f, this = (argvals + [''])[:2]
+ 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]
+ 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)
obj = {}
obj_m = re.search(
r'''(?x)
- (?<!this\.)%s\s*=\s*{\s*
+ (?<!\.)%s\s*=\s*{\s*
(?P<fields>(%s\s*:\s*function\s*\(.*?\)\s*{.*?}(?:,\s*)?)*)
}\s*;
''' % (re.escape(objname), _FUNC_NAME_RE),
fields)
for f in fields_m:
argnames = f.group('args').split(',')
- obj[remove_quotes(f.group('key'))] = self.build_function(argnames, f.group('code'))
+ name = remove_quotes(f.group('key'))
+ obj[name] = function_with_repr(self.build_function(argnames, f.group('code')), f'F<{name}>')
return obj
\((?P<args>[^)]*)\)\s*
(?P<code>{.+})''' % {'name': re.escape(funcname)},
self.code)
- code, _ = self._separate_at_paren(func_m.group('code'), '}')
if func_m is None:
raise self.Exception(f'Could not find JS function "{funcname}"')
+ code, _ = self._separate_at_paren(func_m.group('code'))
return [x.strip() for x in func_m.group('args').split(',')], code
def extract_function(self, funcname):
- return self.extract_function_from_code(*self.extract_function_code(funcname))
+ return function_with_repr(
+ self.extract_function_from_code(*self.extract_function_code(funcname)),
+ f'F<{funcname}>')
def extract_function_from_code(self, argnames, code, *global_stack):
local_vars = {}
if mobj is None:
break
start, body_start = mobj.span()
- body, remaining = self._separate_at_paren(code[body_start - 1:], '}')
+ body, remaining = self._separate_at_paren(code[body_start - 1:])
name = self._named_object(local_vars, self.extract_function_from_code(
[x.strip() for x in mobj.group('args').split(',')],
body, local_vars, *global_stack))
projects / yt-dlp.git / blobdiff