mirror of
https://github.com/ytdl-org/youtube-dl.git
synced 2024-01-07 17:16:08 +00:00
Back-port JS interpreter upgrade from yt-dlp PR #1437
This commit is contained in:
parent
5f5de51a49
commit
96f87aaa3b
|
@ -112,6 +112,57 @@ class TestJSInterpreter(unittest.TestCase):
|
||||||
''')
|
''')
|
||||||
self.assertEqual(jsi.call_function('z'), 5)
|
self.assertEqual(jsi.call_function('z'), 5)
|
||||||
|
|
||||||
|
def test_for_loop(self):
|
||||||
|
# function x() { a=0; for (i=0; i-10; i++) {a++} a }
|
||||||
|
jsi = JSInterpreter('''
|
||||||
|
function x() { a=0; for (i=0; i-10; i = i + 1) {a++} a }
|
||||||
|
''')
|
||||||
|
self.assertEqual(jsi.call_function('x'), 10)
|
||||||
|
|
||||||
|
def test_switch(self):
|
||||||
|
jsi = JSInterpreter('''
|
||||||
|
function x(f) { switch(f){
|
||||||
|
case 1:f+=1;
|
||||||
|
case 2:f+=2;
|
||||||
|
case 3:f+=3;break;
|
||||||
|
case 4:f+=4;
|
||||||
|
default:f=0;
|
||||||
|
} return f }
|
||||||
|
''')
|
||||||
|
self.assertEqual(jsi.call_function('x', 1), 7)
|
||||||
|
self.assertEqual(jsi.call_function('x', 3), 6)
|
||||||
|
self.assertEqual(jsi.call_function('x', 5), 0)
|
||||||
|
|
||||||
|
def test_try(self):
|
||||||
|
jsi = JSInterpreter('''
|
||||||
|
function x() { try{return 10} catch(e){return 5} }
|
||||||
|
''')
|
||||||
|
self.assertEqual(jsi.call_function('x'), 10)
|
||||||
|
|
||||||
|
def test_for_loop_continue(self):
|
||||||
|
jsi = JSInterpreter('''
|
||||||
|
function x() { a=0; for (i=0; i-10; i++) { continue; a++ } a }
|
||||||
|
''')
|
||||||
|
self.assertEqual(jsi.call_function('x'), 0)
|
||||||
|
|
||||||
|
def test_for_loop_break(self):
|
||||||
|
jsi = JSInterpreter('''
|
||||||
|
function x() { a=0; for (i=0; i-10; i++) { break; a++ } a }
|
||||||
|
''')
|
||||||
|
self.assertEqual(jsi.call_function('x'), 0)
|
||||||
|
|
||||||
|
def test_literal_list(self):
|
||||||
|
jsi = JSInterpreter('''
|
||||||
|
function x() { [1, 2, "asdf", [5, 6, 7]][3] }
|
||||||
|
''')
|
||||||
|
self.assertEqual(jsi.call_function('x'), [5, 6, 7])
|
||||||
|
|
||||||
|
def test_comma(self):
|
||||||
|
jsi = JSInterpreter('''
|
||||||
|
function x() { a=5; a -= 1, a+=3; return a }
|
||||||
|
''')
|
||||||
|
self.assertEqual(jsi.call_function('x'), 7)
|
||||||
|
|
||||||
|
|
||||||
if __name__ == '__main__':
|
if __name__ == '__main__':
|
||||||
unittest.main()
|
unittest.main()
|
||||||
|
|
|
@ -21,6 +21,10 @@ import subprocess
|
||||||
import sys
|
import sys
|
||||||
import xml.etree.ElementTree
|
import xml.etree.ElementTree
|
||||||
|
|
||||||
|
try:
|
||||||
|
import collections.abc as compat_collections_abc
|
||||||
|
except ImportError:
|
||||||
|
import collections as compat_collections_abc
|
||||||
|
|
||||||
try:
|
try:
|
||||||
import urllib.request as compat_urllib_request
|
import urllib.request as compat_urllib_request
|
||||||
|
@ -3025,6 +3029,7 @@ __all__ = [
|
||||||
'compat_b64decode',
|
'compat_b64decode',
|
||||||
'compat_basestring',
|
'compat_basestring',
|
||||||
'compat_chr',
|
'compat_chr',
|
||||||
|
'compat_collections_abc',
|
||||||
'compat_cookiejar',
|
'compat_cookiejar',
|
||||||
'compat_cookiejar_Cookie',
|
'compat_cookiejar_Cookie',
|
||||||
'compat_cookies',
|
'compat_cookies',
|
||||||
|
|
|
@ -8,6 +8,15 @@ from .utils import (
|
||||||
ExtractorError,
|
ExtractorError,
|
||||||
remove_quotes,
|
remove_quotes,
|
||||||
)
|
)
|
||||||
|
from .compat import (
|
||||||
|
compat_collections_abc
|
||||||
|
)
|
||||||
|
MutableMapping = compat_collections_abc.MutableMapping
|
||||||
|
|
||||||
|
|
||||||
|
class Nonlocal:
|
||||||
|
pass
|
||||||
|
|
||||||
|
|
||||||
_OPERATORS = [
|
_OPERATORS = [
|
||||||
('|', operator.or_),
|
('|', operator.or_),
|
||||||
|
@ -22,11 +31,55 @@ _OPERATORS = [
|
||||||
('*', operator.mul),
|
('*', operator.mul),
|
||||||
]
|
]
|
||||||
_ASSIGN_OPERATORS = [(op + '=', opfunc) for op, opfunc in _OPERATORS]
|
_ASSIGN_OPERATORS = [(op + '=', opfunc) for op, opfunc in _OPERATORS]
|
||||||
_ASSIGN_OPERATORS.append(('=', lambda cur, right: right))
|
_ASSIGN_OPERATORS.append(('=', (lambda cur, right: right)))
|
||||||
|
|
||||||
_NAME_RE = r'[a-zA-Z_$][a-zA-Z_$0-9]*'
|
_NAME_RE = r'[a-zA-Z_$][a-zA-Z_$0-9]*'
|
||||||
|
|
||||||
|
|
||||||
|
class JS_Break(ExtractorError):
|
||||||
|
def __init__(self):
|
||||||
|
ExtractorError.__init__(self, 'Invalid break')
|
||||||
|
|
||||||
|
|
||||||
|
class JS_Continue(ExtractorError):
|
||||||
|
def __init__(self):
|
||||||
|
ExtractorError.__init__(self, 'Invalid continue')
|
||||||
|
|
||||||
|
|
||||||
|
class LocalNameSpace(MutableMapping):
|
||||||
|
def __init__(self, *stack):
|
||||||
|
self.stack = tuple(stack)
|
||||||
|
|
||||||
|
def __getitem__(self, key):
|
||||||
|
for scope in self.stack:
|
||||||
|
if key in scope:
|
||||||
|
return scope[key]
|
||||||
|
raise KeyError(key)
|
||||||
|
|
||||||
|
def __setitem__(self, key, value):
|
||||||
|
for scope in self.stack:
|
||||||
|
if key in scope:
|
||||||
|
scope[key] = value
|
||||||
|
break
|
||||||
|
else:
|
||||||
|
self.stack[0][key] = value
|
||||||
|
return value
|
||||||
|
|
||||||
|
def __delitem__(self, key):
|
||||||
|
raise NotImplementedError('Deleting is not supported')
|
||||||
|
|
||||||
|
def __iter__(self):
|
||||||
|
for scope in self.stack:
|
||||||
|
for scope_item in iter(scope):
|
||||||
|
yield scope_item
|
||||||
|
|
||||||
|
def __len__(self, key):
|
||||||
|
return len(iter(self))
|
||||||
|
|
||||||
|
def __repr__(self):
|
||||||
|
return 'LocalNameSpace%s' % (self.stack, )
|
||||||
|
|
||||||
|
|
||||||
class JSInterpreter(object):
|
class JSInterpreter(object):
|
||||||
def __init__(self, code, objects=None):
|
def __init__(self, code, objects=None):
|
||||||
if objects is None:
|
if objects is None:
|
||||||
|
@ -34,11 +87,58 @@ class JSInterpreter(object):
|
||||||
self.code = code
|
self.code = code
|
||||||
self._functions = {}
|
self._functions = {}
|
||||||
self._objects = objects
|
self._objects = objects
|
||||||
|
self.__named_object_counter = 0
|
||||||
|
|
||||||
|
def _named_object(self, namespace, obj):
|
||||||
|
self.__named_object_counter += 1
|
||||||
|
name = '__youtube_dl_jsinterp_obj%s' % (self.__named_object_counter, )
|
||||||
|
namespace[name] = obj
|
||||||
|
return name
|
||||||
|
|
||||||
|
@staticmethod
|
||||||
|
def _separate(expr, delim=',', max_split=None):
|
||||||
|
if not expr:
|
||||||
|
return
|
||||||
|
parens = {'(': 0, '{': 0, '[': 0, ']': 0, '}': 0, ')': 0}
|
||||||
|
start, splits, pos, max_pos = 0, 0, 0, len(delim) - 1
|
||||||
|
for idx, char in enumerate(expr):
|
||||||
|
if char in parens:
|
||||||
|
parens[char] += 1
|
||||||
|
is_in_parens = (parens['['] - parens[']']
|
||||||
|
or parens['('] - parens[')']
|
||||||
|
or parens['{'] - parens['}'])
|
||||||
|
if char == delim[pos] and not is_in_parens:
|
||||||
|
if pos == max_pos:
|
||||||
|
pos = 0
|
||||||
|
yield expr[start: idx - max_pos]
|
||||||
|
start = idx + 1
|
||||||
|
splits += 1
|
||||||
|
if max_split and splits >= max_split:
|
||||||
|
break
|
||||||
|
else:
|
||||||
|
pos += 1
|
||||||
|
else:
|
||||||
|
pos = 0
|
||||||
|
yield expr[start:]
|
||||||
|
|
||||||
|
@staticmethod
|
||||||
|
def _separate_at_paren(expr, delim):
|
||||||
|
separated = list(JSInterpreter._separate(expr, delim, 1))
|
||||||
|
if len(separated) < 2:
|
||||||
|
raise ExtractorError('No terminating paren {0} in {1}'.format(delim, expr))
|
||||||
|
return separated[0][1:].strip(), separated[1].strip()
|
||||||
|
|
||||||
def interpret_statement(self, stmt, local_vars, allow_recursion=100):
|
def interpret_statement(self, stmt, local_vars, allow_recursion=100):
|
||||||
if allow_recursion < 0:
|
if allow_recursion < 0:
|
||||||
raise ExtractorError('Recursion limit reached')
|
raise ExtractorError('Recursion limit reached')
|
||||||
|
|
||||||
|
sub_statements = list(self._separate(stmt, ';'))
|
||||||
|
stmt = (sub_statements or ['']).pop()
|
||||||
|
for sub_stmt in sub_statements:
|
||||||
|
ret, should_abort = self.interpret_statement(sub_stmt, local_vars, allow_recursion - 1)
|
||||||
|
if should_abort:
|
||||||
|
return ret
|
||||||
|
|
||||||
should_abort = False
|
should_abort = False
|
||||||
stmt = stmt.lstrip()
|
stmt = stmt.lstrip()
|
||||||
stmt_m = re.match(r'var\s', stmt)
|
stmt_m = re.match(r'var\s', stmt)
|
||||||
|
@ -61,25 +161,119 @@ class JSInterpreter(object):
|
||||||
if expr == '': # Empty expression
|
if expr == '': # Empty expression
|
||||||
return None
|
return None
|
||||||
|
|
||||||
|
if expr.startswith('{'):
|
||||||
|
inner, outer = self._separate_at_paren(expr, '}')
|
||||||
|
inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion - 1)
|
||||||
|
if not outer or should_abort:
|
||||||
|
return inner
|
||||||
|
else:
|
||||||
|
expr = json.dumps(inner) + outer
|
||||||
|
|
||||||
if expr.startswith('('):
|
if expr.startswith('('):
|
||||||
parens_count = 0
|
inner, outer = self._separate_at_paren(expr, ')')
|
||||||
for m in re.finditer(r'[()]', expr):
|
inner = self.interpret_expression(inner, local_vars, allow_recursion)
|
||||||
if m.group(0) == '(':
|
if not outer:
|
||||||
parens_count += 1
|
return inner
|
||||||
else:
|
else:
|
||||||
parens_count -= 1
|
expr = json.dumps(inner) + outer
|
||||||
if parens_count == 0:
|
|
||||||
sub_expr = expr[1:m.start()]
|
if expr.startswith('['):
|
||||||
sub_result = self.interpret_expression(
|
inner, outer = self._separate_at_paren(expr, ']')
|
||||||
sub_expr, local_vars, allow_recursion)
|
name = self._named_object(local_vars, [
|
||||||
remaining_expr = expr[m.end():].strip()
|
self.interpret_expression(item, local_vars, allow_recursion)
|
||||||
if not remaining_expr:
|
for item in self._separate(inner)])
|
||||||
return sub_result
|
expr = name + outer
|
||||||
|
|
||||||
|
m = re.match(r'try\s*', expr)
|
||||||
|
if m:
|
||||||
|
if expr[m.end()] == '{':
|
||||||
|
try_expr, expr = self._separate_at_paren(expr[m.end():], '}')
|
||||||
else:
|
else:
|
||||||
expr = json.dumps(sub_result) + remaining_expr
|
try_expr, expr = expr[m.end() - 1:], ''
|
||||||
|
ret, should_abort = self.interpret_statement(try_expr, local_vars, allow_recursion - 1)
|
||||||
|
if should_abort:
|
||||||
|
return ret
|
||||||
|
return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0]
|
||||||
|
|
||||||
|
m = re.match(r'(?:(?P<catch>catch)|(?P<for>for)|(?P<switch>switch))\s*\(', expr)
|
||||||
|
md = m.groupdict() if m else {}
|
||||||
|
if md.get('catch'):
|
||||||
|
# We ignore the catch block
|
||||||
|
_, expr = self._separate_at_paren(expr, '}')
|
||||||
|
return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0]
|
||||||
|
|
||||||
|
elif md.get('for'):
|
||||||
|
def raise_constructor_error(c):
|
||||||
|
raise ExtractorError(
|
||||||
|
'Premature return in the initialization of a for loop in {0!r}'.format(c))
|
||||||
|
|
||||||
|
constructor, remaining = self._separate_at_paren(expr[m.end() - 1:], ')')
|
||||||
|
if remaining.startswith('{'):
|
||||||
|
body, expr = self._separate_at_paren(remaining, '}')
|
||||||
|
else:
|
||||||
|
m = re.match(r'switch\s*\(', remaining) # FIXME
|
||||||
|
if m:
|
||||||
|
switch_val, remaining = self._separate_at_paren(remaining[m.end() - 1:], ')')
|
||||||
|
body, expr = self._separate_at_paren(remaining, '}')
|
||||||
|
body = 'switch(%s){%s}' % (switch_val, body)
|
||||||
|
else:
|
||||||
|
body, expr = remaining, ''
|
||||||
|
start, cndn, increment = self._separate(constructor, ';')
|
||||||
|
if self.interpret_statement(start, local_vars, allow_recursion - 1)[1]:
|
||||||
|
raise_constructor_error(constructor)
|
||||||
|
while True:
|
||||||
|
if not self.interpret_expression(cndn, local_vars, allow_recursion):
|
||||||
break
|
break
|
||||||
else:
|
try:
|
||||||
raise ExtractorError('Premature end of parens in %r' % expr)
|
ret, should_abort = self.interpret_statement(body, local_vars, allow_recursion - 1)
|
||||||
|
if should_abort:
|
||||||
|
return ret
|
||||||
|
except JS_Break:
|
||||||
|
break
|
||||||
|
except JS_Continue:
|
||||||
|
pass
|
||||||
|
if self.interpret_statement(increment, local_vars, allow_recursion - 1)[1]:
|
||||||
|
raise_constructor_error(constructor)
|
||||||
|
return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0]
|
||||||
|
|
||||||
|
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, '}')
|
||||||
|
body, default = body.split('default:') if 'default:' in body else (body, None)
|
||||||
|
items = body.split('case ')[1:]
|
||||||
|
if default:
|
||||||
|
items.append('default:%s' % (default, ))
|
||||||
|
matched = False
|
||||||
|
for item in items:
|
||||||
|
case, stmt = [i.strip() for i in self._separate(item, ':', 1)]
|
||||||
|
matched = matched or case == 'default' or switch_val == self.interpret_expression(case, local_vars, allow_recursion)
|
||||||
|
if matched:
|
||||||
|
try:
|
||||||
|
ret, should_abort = self.interpret_statement(stmt, local_vars, allow_recursion - 1)
|
||||||
|
if should_abort:
|
||||||
|
return ret
|
||||||
|
except JS_Break:
|
||||||
|
break
|
||||||
|
return self.interpret_statement(expr, local_vars, allow_recursion - 1)[0]
|
||||||
|
|
||||||
|
# Comma separated statements
|
||||||
|
sub_expressions = list(self._separate(expr))
|
||||||
|
expr = sub_expressions.pop().strip() if sub_expressions else ''
|
||||||
|
for sub_expr in sub_expressions:
|
||||||
|
self.interpret_expression(sub_expr, local_vars, allow_recursion)
|
||||||
|
|
||||||
|
for m in re.finditer(r'''(?x)
|
||||||
|
(?P<pre_sign>\+\+|--)(?P<var1>%(_NAME_RE)s)|
|
||||||
|
(?P<var2>%(_NAME_RE)s)(?P<post_sign>\+\+|--)''' % globals(), 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] + json.dumps(ret) + expr[end:]
|
||||||
|
|
||||||
for op, opfunc in _ASSIGN_OPERATORS:
|
for op, opfunc in _ASSIGN_OPERATORS:
|
||||||
m = re.match(r'''(?x)
|
m = re.match(r'''(?x)
|
||||||
|
@ -88,14 +282,13 @@ class JSInterpreter(object):
|
||||||
(?P<expr>.*)$''' % (_NAME_RE, re.escape(op)), expr)
|
(?P<expr>.*)$''' % (_NAME_RE, re.escape(op)), expr)
|
||||||
if not m:
|
if not m:
|
||||||
continue
|
continue
|
||||||
right_val = self.interpret_expression(
|
right_val = self.interpret_expression(m.group('expr'), local_vars, allow_recursion)
|
||||||
m.group('expr'), local_vars, allow_recursion - 1)
|
|
||||||
|
|
||||||
if m.groupdict().get('index'):
|
if m.groupdict().get('index'):
|
||||||
lvar = local_vars[m.group('out')]
|
lvar = local_vars[m.group('out')]
|
||||||
idx = self.interpret_expression(
|
idx = self.interpret_expression(m.group('index'), local_vars, allow_recursion)
|
||||||
m.group('index'), local_vars, allow_recursion)
|
if not isinstance(idx, int):
|
||||||
assert isinstance(idx, int)
|
raise ExtractorError('List indices must be integers: %s' % (idx, ))
|
||||||
cur = lvar[idx]
|
cur = lvar[idx]
|
||||||
val = opfunc(cur, right_val)
|
val = opfunc(cur, right_val)
|
||||||
lvar[idx] = val
|
lvar[idx] = val
|
||||||
|
@ -109,8 +302,13 @@ class JSInterpreter(object):
|
||||||
if expr.isdigit():
|
if expr.isdigit():
|
||||||
return int(expr)
|
return int(expr)
|
||||||
|
|
||||||
|
if expr == 'break':
|
||||||
|
raise JS_Break()
|
||||||
|
elif expr == 'continue':
|
||||||
|
raise JS_Continue()
|
||||||
|
|
||||||
var_m = re.match(
|
var_m = re.match(
|
||||||
r'(?!if|return|true|false)(?P<name>%s)$' % _NAME_RE,
|
r'(?!if|return|true|false|null)(?P<name>%s)$' % _NAME_RE,
|
||||||
expr)
|
expr)
|
||||||
if var_m:
|
if var_m:
|
||||||
return local_vars[var_m.group('name')]
|
return local_vars[var_m.group('name')]
|
||||||
|
@ -124,19 +322,53 @@ class JSInterpreter(object):
|
||||||
r'(?P<in>%s)\[(?P<idx>.+)\]$' % _NAME_RE, expr)
|
r'(?P<in>%s)\[(?P<idx>.+)\]$' % _NAME_RE, expr)
|
||||||
if m:
|
if m:
|
||||||
val = local_vars[m.group('in')]
|
val = local_vars[m.group('in')]
|
||||||
idx = self.interpret_expression(
|
idx = self.interpret_expression(m.group('idx'), local_vars, allow_recursion)
|
||||||
m.group('idx'), local_vars, allow_recursion - 1)
|
|
||||||
return val[idx]
|
return val[idx]
|
||||||
|
|
||||||
|
def raise_expr_error(where, op, exp):
|
||||||
|
raise ExtractorError('Premature {0} return of {1} in {2!r}'.format(where, op, exp))
|
||||||
|
|
||||||
|
for op, opfunc in _OPERATORS:
|
||||||
|
separated = list(self._separate(expr, op))
|
||||||
|
if len(separated) < 2:
|
||||||
|
continue
|
||||||
|
right_val = separated.pop()
|
||||||
|
left_val = op.join(separated)
|
||||||
|
left_val, should_abort = self.interpret_statement(
|
||||||
|
left_val, local_vars, allow_recursion - 1)
|
||||||
|
if should_abort:
|
||||||
|
raise_expr_error('left-side', op, expr)
|
||||||
|
right_val, should_abort = self.interpret_statement(
|
||||||
|
right_val, local_vars, allow_recursion - 1)
|
||||||
|
if should_abort:
|
||||||
|
raise_expr_error('right-side', op, expr)
|
||||||
|
return opfunc(left_val or 0, right_val)
|
||||||
|
|
||||||
m = re.match(
|
m = re.match(
|
||||||
r'(?P<var>%s)(?:\.(?P<member>[^(]+)|\[(?P<member2>[^]]+)\])\s*(?:\(+(?P<args>[^()]*)\))?$' % _NAME_RE,
|
r'(?P<var>%s)(?:\.(?P<member>[^(]+)|\[(?P<member2>[^]]+)\])\s*' % _NAME_RE,
|
||||||
expr)
|
expr)
|
||||||
if m:
|
if m:
|
||||||
variable = m.group('var')
|
variable = m.group('var')
|
||||||
member = remove_quotes(m.group('member') or m.group('member2'))
|
nl = Nonlocal()
|
||||||
arg_str = m.group('args')
|
|
||||||
|
|
||||||
if variable in local_vars:
|
nl.member = remove_quotes(m.group('member') or m.group('member2'))
|
||||||
|
arg_str = expr[m.end():]
|
||||||
|
if arg_str.startswith('('):
|
||||||
|
arg_str, remaining = self._separate_at_paren(arg_str, ')')
|
||||||
|
else:
|
||||||
|
arg_str, remaining = None, arg_str
|
||||||
|
|
||||||
|
def assertion(cndn, msg):
|
||||||
|
""" assert, but without risk of getting optimized out """
|
||||||
|
if not cndn:
|
||||||
|
raise ExtractorError('{0} {1}: {2}'.format(nl.member, msg, expr))
|
||||||
|
|
||||||
|
def eval_method():
|
||||||
|
# nonlocal member
|
||||||
|
member = nl.member
|
||||||
|
if variable == 'String':
|
||||||
|
obj = str
|
||||||
|
elif variable in local_vars:
|
||||||
obj = local_vars[variable]
|
obj = local_vars[variable]
|
||||||
else:
|
else:
|
||||||
if variable not in self._objects:
|
if variable not in self._objects:
|
||||||
|
@ -149,65 +381,101 @@ class JSInterpreter(object):
|
||||||
return len(obj)
|
return len(obj)
|
||||||
return obj[member]
|
return obj[member]
|
||||||
|
|
||||||
assert expr.endswith(')')
|
|
||||||
# Function call
|
# Function call
|
||||||
if arg_str == '':
|
argvals = [
|
||||||
argvals = tuple()
|
|
||||||
else:
|
|
||||||
argvals = tuple([
|
|
||||||
self.interpret_expression(v, local_vars, allow_recursion)
|
self.interpret_expression(v, local_vars, allow_recursion)
|
||||||
for v in arg_str.split(',')])
|
for v in self._separate(arg_str)]
|
||||||
|
|
||||||
|
if obj == str:
|
||||||
|
if member == 'fromCharCode':
|
||||||
|
assertion(argvals, 'takes one or more arguments')
|
||||||
|
return ''.join(map(chr, argvals))
|
||||||
|
raise ExtractorError('Unsupported string method %s' % (member, ))
|
||||||
|
|
||||||
if member == 'split':
|
if member == 'split':
|
||||||
assert argvals == ('',)
|
assertion(argvals, 'takes one or more arguments')
|
||||||
|
assertion(argvals == [''], 'with arguments is not implemented')
|
||||||
return list(obj)
|
return list(obj)
|
||||||
if member == 'join':
|
elif member == 'join':
|
||||||
assert len(argvals) == 1
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
||||||
|
assertion(len(argvals) == 1, 'takes exactly one argument')
|
||||||
return argvals[0].join(obj)
|
return argvals[0].join(obj)
|
||||||
if member == 'reverse':
|
elif member == 'reverse':
|
||||||
assert len(argvals) == 0
|
assertion(not argvals, 'does not take any arguments')
|
||||||
obj.reverse()
|
obj.reverse()
|
||||||
return obj
|
return obj
|
||||||
if member == 'slice':
|
elif member == 'slice':
|
||||||
assert len(argvals) == 1
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
||||||
|
assertion(len(argvals) == 1, 'takes exactly one argument')
|
||||||
return obj[argvals[0]:]
|
return obj[argvals[0]:]
|
||||||
if member == 'splice':
|
elif member == 'splice':
|
||||||
assert isinstance(obj, list)
|
assertion(isinstance(obj, list), 'must be applied on a list')
|
||||||
index, howMany = argvals
|
assertion(argvals, 'takes one or more arguments')
|
||||||
|
index, howMany = (argvals + [len(obj)])[:2]
|
||||||
|
if index < 0:
|
||||||
|
index += len(obj)
|
||||||
|
add_items = argvals[2:]
|
||||||
res = []
|
res = []
|
||||||
for i in range(index, min(index + howMany, len(obj))):
|
for i in range(index, min(index + howMany, len(obj))):
|
||||||
res.append(obj.pop(index))
|
res.append(obj.pop(index))
|
||||||
|
for i, item in enumerate(add_items):
|
||||||
|
obj.insert(index + i, item)
|
||||||
return res
|
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) 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
|
||||||
|
|
||||||
|
if isinstance(obj, list):
|
||||||
|
member = int(member)
|
||||||
|
nl.member = member
|
||||||
return obj[member](argvals)
|
return obj[member](argvals)
|
||||||
|
|
||||||
for op, opfunc in _OPERATORS:
|
if remaining:
|
||||||
m = re.match(r'(?P<x>.+?)%s(?P<y>.+)' % re.escape(op), expr)
|
return self.interpret_expression(
|
||||||
if not m:
|
self._named_object(local_vars, eval_method()) + remaining,
|
||||||
continue
|
local_vars, allow_recursion)
|
||||||
x, abort = self.interpret_statement(
|
else:
|
||||||
m.group('x'), local_vars, allow_recursion - 1)
|
return eval_method()
|
||||||
if abort:
|
|
||||||
raise ExtractorError(
|
|
||||||
'Premature left-side return of %s in %r' % (op, expr))
|
|
||||||
y, abort = self.interpret_statement(
|
|
||||||
m.group('y'), local_vars, allow_recursion - 1)
|
|
||||||
if abort:
|
|
||||||
raise ExtractorError(
|
|
||||||
'Premature right-side return of %s in %r' % (op, expr))
|
|
||||||
return opfunc(x, y)
|
|
||||||
|
|
||||||
m = re.match(
|
m = re.match(r'^(?P<func>%s)\((?P<args>[a-zA-Z0-9_$,]*)\)$' % _NAME_RE, expr)
|
||||||
r'^(?P<func>%s)\((?P<args>[a-zA-Z0-9_$,]*)\)$' % _NAME_RE, expr)
|
|
||||||
if m:
|
if m:
|
||||||
fname = m.group('func')
|
fname = m.group('func')
|
||||||
argvals = tuple([
|
argvals = tuple([
|
||||||
int(v) if v.isdigit() else local_vars[v]
|
int(v) if v.isdigit() else local_vars[v]
|
||||||
for v in m.group('args').split(',')]) if len(m.group('args')) > 0 else tuple()
|
for v in self._separate(m.group('args'))])
|
||||||
if fname not in self._functions:
|
if fname in local_vars:
|
||||||
|
return local_vars[fname](argvals)
|
||||||
|
elif fname not in self._functions:
|
||||||
self._functions[fname] = self.extract_function(fname)
|
self._functions[fname] = self.extract_function(fname)
|
||||||
return self._functions[fname](argvals)
|
return self._functions[fname](argvals)
|
||||||
|
|
||||||
|
if expr:
|
||||||
raise ExtractorError('Unsupported JS expression %r' % expr)
|
raise ExtractorError('Unsupported JS expression %r' % expr)
|
||||||
|
|
||||||
def extract_object(self, objname):
|
def extract_object(self, objname):
|
||||||
|
@ -233,30 +501,52 @@ class JSInterpreter(object):
|
||||||
|
|
||||||
return obj
|
return obj
|
||||||
|
|
||||||
def extract_function(self, funcname):
|
def extract_function_code(self, funcname):
|
||||||
|
""" @returns argnames, code """
|
||||||
func_m = re.search(
|
func_m = re.search(
|
||||||
r'''(?x)
|
r'''(?x)
|
||||||
(?:function\s+%s|[{;,]\s*%s\s*=\s*function|var\s+%s\s*=\s*function)\s*
|
(?:function\s+%(f_n)s|[{;,]\s*%(f_n)s\s*=\s*function|var\s+%(f_n)s\s*=\s*function)\s*
|
||||||
\((?P<args>[^)]*)\)\s*
|
\((?P<args>[^)]*)\)\s*
|
||||||
\{(?P<code>[^}]+)\}''' % (
|
(?P<code>\{(?:(?!};)[^"]|"([^"]|\\")*")+\})''' % {'f_n': re.escape(funcname), },
|
||||||
re.escape(funcname), re.escape(funcname), re.escape(funcname)),
|
|
||||||
self.code)
|
self.code)
|
||||||
|
code, _ = self._separate_at_paren(func_m.group('code'), '}') # refine the match
|
||||||
if func_m is None:
|
if func_m is None:
|
||||||
raise ExtractorError('Could not find JS function %r' % funcname)
|
raise ExtractorError('Could not find JS function %r' % funcname)
|
||||||
argnames = func_m.group('args').split(',')
|
return func_m.group('args').split(','), code
|
||||||
|
|
||||||
return self.build_function(argnames, func_m.group('code'))
|
def extract_function(self, funcname):
|
||||||
|
return self.extract_function_from_code(*self.extract_function_code(funcname))
|
||||||
|
|
||||||
|
def extract_function_from_code(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._separate_at_paren(code[body_start - 1:], '}')
|
||||||
|
name = self._named_object(
|
||||||
|
local_vars,
|
||||||
|
self.extract_function_from_code(
|
||||||
|
[str.strip(x) for x in mobj.group('args').split(',')],
|
||||||
|
body, local_vars, *global_stack))
|
||||||
|
code = code[:start] + name + remaining
|
||||||
|
return self.build_function(argnames, code, local_vars, *global_stack)
|
||||||
|
|
||||||
def call_function(self, funcname, *args):
|
def call_function(self, funcname, *args):
|
||||||
f = self.extract_function(funcname)
|
return self.extract_function(funcname)(args)
|
||||||
return f(args)
|
|
||||||
|
|
||||||
def build_function(self, argnames, code):
|
def build_function(self, argnames, code, *global_stack):
|
||||||
def resf(args):
|
global_stack = list(global_stack) or [{}]
|
||||||
local_vars = dict(zip(argnames, args))
|
local_vars = global_stack.pop(0)
|
||||||
for stmt in code.split(';'):
|
|
||||||
res, abort = self.interpret_statement(stmt, local_vars)
|
def resf(args, **kwargs):
|
||||||
if abort:
|
local_vars.update(dict(zip(argnames, args)))
|
||||||
|
local_vars.update(kwargs)
|
||||||
|
var_stack = LocalNameSpace(local_vars, *global_stack)
|
||||||
|
for stmt in self._separate(code.replace('\n', ''), ';'):
|
||||||
|
ret, should_abort = self.interpret_statement(stmt, var_stack)
|
||||||
|
if should_abort:
|
||||||
break
|
break
|
||||||
return res
|
return ret
|
||||||
return resf
|
return resf
|
||||||
|
|
Loading…
Reference in a new issue