[jsinterp] Improve try/catch/finally support
This commit is contained in:
dirkf
parent
d619dd712f
commit
4c6fba3765
2 changed files with 61 additions and 41 deletions
|
|
@ -74,6 +74,9 @@ class TestJSInterpreter(unittest.TestCase):
|
|||
jsi = JSInterpreter('function f(){return 0 ?? 42;}')
|
||||
self.assertEqual(jsi.call_function('f'), 0)
|
||||
|
||||
jsi = JSInterpreter('function f(){return "life, the universe and everything" < 42;}')
|
||||
self.assertFalse(jsi.call_function('f'))
|
||||
|
||||
def test_array_access(self):
|
||||
jsi = JSInterpreter('function f(){var x = [1,2,3]; x[0] = 4; x[0] = 5; x[2.0] = 7; return x;}')
|
||||
self.assertEqual(jsi.call_function('f'), [5, 2, 7])
|
||||
|
|
@ -198,7 +201,6 @@ class TestJSInterpreter(unittest.TestCase):
|
|||
''')
|
||||
self.assertEqual(jsi.call_function('x'), 5)
|
||||
|
||||
@unittest.expectedFailure
|
||||
def test_finally(self):
|
||||
jsi = JSInterpreter('''
|
||||
function x() { try{throw 10} finally {return 42} }
|
||||
|
|
@ -229,6 +231,14 @@ class TestJSInterpreter(unittest.TestCase):
|
|||
''')
|
||||
self.assertEqual(jsi.call_function('x'), 0)
|
||||
|
||||
def test_for_loop_try(self):
|
||||
jsi = JSInterpreter('''
|
||||
function x() {
|
||||
for (i=0; i-10; i++) { try { if (i == 5) throw i} catch {return 10} finally {break} };
|
||||
return 42 }
|
||||
''')
|
||||
self.assertEqual(jsi.call_function('x'), 42)
|
||||
|
||||
def test_literal_list(self):
|
||||
jsi = JSInterpreter('''
|
||||
function x() { return [1, 2, "asdf", [5, 6, 7]][3] }
|
||||
|
|
|
|||
|
|
@ -5,7 +5,6 @@ import json
|
|||
import math
|
||||
import operator
|
||||
import re
|
||||
from collections import Counter
|
||||
|
||||
from .utils import (
|
||||
error_to_compat_str,
|
||||
|
|
@ -15,6 +14,7 @@ from .utils import (
|
|||
unified_timestamp,
|
||||
)
|
||||
from .compat import (
|
||||
compat_basestring,
|
||||
compat_collections_chain_map as ChainMap,
|
||||
compat_itertools_zip_longest as zip_longest,
|
||||
compat_str,
|
||||
|
|
@ -76,6 +76,10 @@ def _js_comp_op(op):
|
|||
def wrapped(a, b):
|
||||
if JS_Undefined in (a, b):
|
||||
return False
|
||||
if isinstance(a, compat_basestring):
|
||||
b = compat_str(b or 0)
|
||||
elif isinstance(b, compat_basestring):
|
||||
a = compat_str(a or 0)
|
||||
return op(a or 0, b or 0)
|
||||
|
||||
return wrapped
|
||||
|
|
@ -195,7 +199,6 @@ class JSInterpreter(object):
|
|||
'y': 4096, # Perform a "sticky" search that matches starting at the current position in the target string
|
||||
}
|
||||
|
||||
_EXC_NAME = '__youtube_dl_exception__'
|
||||
_OBJ_NAME = '__youtube_dl_jsinterp_obj'
|
||||
|
||||
OP_CHARS = None
|
||||
|
|
@ -242,9 +245,8 @@ class JSInterpreter(object):
|
|||
def _separate(cls, expr, delim=',', max_split=None, skip_delims=None):
|
||||
if not expr:
|
||||
return
|
||||
# collections.Counter() is ~10% slower
|
||||
# collections.Counter() is ~10% slower in both 2.7 and 3.9
|
||||
counters = {k: 0 for k in _MATCHING_PARENS.values()}
|
||||
# counters = Counter()
|
||||
start, splits, pos, delim_len = 0, 0, 0, len(delim) - 1
|
||||
in_quote, escaping, skipping = None, False, 0
|
||||
after_op, in_regex_char_group, skip_re = True, False, 0
|
||||
|
|
@ -291,7 +293,9 @@ class JSInterpreter(object):
|
|||
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:
|
||||
|
|
@ -376,7 +380,7 @@ class JSInterpreter(object):
|
|||
if expr.startswith('new '):
|
||||
obj = expr[4:]
|
||||
if obj.startswith('Date('):
|
||||
left, right = self._separate_at_paren(obj[4:], ')')
|
||||
left, right = self._separate_at_paren(obj[4:])
|
||||
expr = unified_timestamp(
|
||||
self.interpret_expression(left, local_vars, allow_recursion), False)
|
||||
if not expr:
|
||||
|
|
@ -390,7 +394,7 @@ class JSInterpreter(object):
|
|||
return None, should_return
|
||||
|
||||
if expr.startswith('{'):
|
||||
inner, outer = self._separate_at_paren(expr, '}')
|
||||
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):
|
||||
|
|
@ -406,7 +410,7 @@ class JSInterpreter(object):
|
|||
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
|
||||
|
|
@ -414,57 +418,63 @@ class JSInterpreter(object):
|
|||
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(r'''(?x)
|
||||
(?P<try>try|finally)\s*|
|
||||
(?P<catch>catch\s*(?P<err>\(\s*{_NAME_RE}\s*\)))|
|
||||
(?P<switch>switch)\s*\(|
|
||||
(?P<for>for)\s*\(|
|
||||
'''.format(**globals()), expr)
|
||||
(?P<try>try)\s*\{|
|
||||
(?P<switch>switch)\s*\(|
|
||||
(?P<for>for)\s*\(
|
||||
''', expr)
|
||||
md = m.groupdict() if m else {}
|
||||
if md.get('try'):
|
||||
if expr[m.end()] == '{':
|
||||
try_expr, expr = self._separate_at_paren(expr[m.end():], '}')
|
||||
else:
|
||||
try_expr, expr = expr[m.end() - 1:], ''
|
||||
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
|
||||
err = e
|
||||
|
||||
elif md.get('catch'):
|
||||
pending = (None, False)
|
||||
m = re.match(r'catch\s*(?P<err>\(\s*{_NAME_RE}\s*\))?\{{'.format(**globals()), 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(m=catch_vars)
|
||||
err = None
|
||||
pending = self.interpret_statement(sub_expr, catch_vars, allow_recursion)
|
||||
|
||||
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)
|
||||
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)
|
||||
ret, should_abort = pending
|
||||
if should_abort:
|
||||
return ret, True
|
||||
|
||||
return ret, should_abort or should_return
|
||||
if err:
|
||||
raise err
|
||||
|
||||
elif md.get('for'):
|
||||
constructor, remaining = self._separate_at_paren(expr[m.end() - 1:], ')')
|
||||
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
|
||||
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:
|
||||
|
|
@ -483,11 +493,9 @@ class JSInterpreter(object):
|
|||
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 md.get('switch'):
|
||||
switch_val, remaining = self._separate_at_paren(expr[m.end() - 1:], ')')
|
||||
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:]
|
||||
|
|
@ -510,6 +518,8 @@ class JSInterpreter(object):
|
|||
break
|
||||
if matched:
|
||||
break
|
||||
|
||||
if md:
|
||||
ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
|
||||
return ret, should_abort or should_return
|
||||
|
||||
|
|
@ -618,7 +628,7 @@ class JSInterpreter(object):
|
|||
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
|
||||
|
||||
|
|
@ -795,7 +805,7 @@ class JSInterpreter(object):
|
|||
\((?P<args>[^)]*)\)\s*
|
||||
(?P<code>{.+})''' % {'name': re.escape(funcname)},
|
||||
self.code)
|
||||
code, _ = self._separate_at_paren(func_m.group('code'), '}') # refine the match
|
||||
code, _ = self._separate_at_paren(func_m.group('code')) # refine the match
|
||||
if func_m is None:
|
||||
raise self.Exception('Could not find JS function "{funcname}"'.format(**locals()))
|
||||
return self.build_arglist(func_m.group('args')), code
|
||||
|
|
@ -810,7 +820,7 @@ class JSInterpreter(object):
|
|||
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(
|
||||
|
|
|
|||
Loading…
Reference in a new issue