[jsinterp] Improve try/catch/finally support
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dirkf
parent
d619dd712f
commit
4c6fba3765
2 changed files with 61 additions and 41 deletions
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@ -74,6 +74,9 @@ class TestJSInterpreter(unittest.TestCase):
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jsi = JSInterpreter('function f(){return 0 ?? 42;}')
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self.assertEqual(jsi.call_function('f'), 0)
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jsi = JSInterpreter('function f(){return "life, the universe and everything" < 42;}')
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self.assertFalse(jsi.call_function('f'))
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def test_array_access(self):
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jsi = JSInterpreter('function f(){var x = [1,2,3]; x[0] = 4; x[0] = 5; x[2.0] = 7; return x;}')
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self.assertEqual(jsi.call_function('f'), [5, 2, 7])
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@ -198,7 +201,6 @@ class TestJSInterpreter(unittest.TestCase):
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''')
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self.assertEqual(jsi.call_function('x'), 5)
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@unittest.expectedFailure
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def test_finally(self):
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jsi = JSInterpreter('''
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function x() { try{throw 10} finally {return 42} }
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@ -229,6 +231,14 @@ class TestJSInterpreter(unittest.TestCase):
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''')
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self.assertEqual(jsi.call_function('x'), 0)
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def test_for_loop_try(self):
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jsi = JSInterpreter('''
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function x() {
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for (i=0; i-10; i++) { try { if (i == 5) throw i} catch {return 10} finally {break} };
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return 42 }
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''')
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self.assertEqual(jsi.call_function('x'), 42)
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def test_literal_list(self):
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jsi = JSInterpreter('''
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function x() { return [1, 2, "asdf", [5, 6, 7]][3] }
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@ -5,7 +5,6 @@ import json
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import math
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import operator
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import re
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from collections import Counter
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from .utils import (
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error_to_compat_str,
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@ -15,6 +14,7 @@ from .utils import (
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unified_timestamp,
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)
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from .compat import (
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compat_basestring,
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compat_collections_chain_map as ChainMap,
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compat_itertools_zip_longest as zip_longest,
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compat_str,
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@ -76,6 +76,10 @@ def _js_comp_op(op):
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def wrapped(a, b):
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if JS_Undefined in (a, b):
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return False
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if isinstance(a, compat_basestring):
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b = compat_str(b or 0)
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elif isinstance(b, compat_basestring):
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a = compat_str(a or 0)
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return op(a or 0, b or 0)
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return wrapped
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@ -195,7 +199,6 @@ class JSInterpreter(object):
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'y': 4096, # Perform a "sticky" search that matches starting at the current position in the target string
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}
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_EXC_NAME = '__youtube_dl_exception__'
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_OBJ_NAME = '__youtube_dl_jsinterp_obj'
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OP_CHARS = None
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@ -242,9 +245,8 @@ class JSInterpreter(object):
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def _separate(cls, expr, delim=',', max_split=None, skip_delims=None):
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if not expr:
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return
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# collections.Counter() is ~10% slower
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# collections.Counter() is ~10% slower in both 2.7 and 3.9
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counters = {k: 0 for k in _MATCHING_PARENS.values()}
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# counters = Counter()
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start, splits, pos, delim_len = 0, 0, 0, len(delim) - 1
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in_quote, escaping, skipping = None, False, 0
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after_op, in_regex_char_group, skip_re = True, False, 0
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@ -291,7 +293,9 @@ class JSInterpreter(object):
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yield expr[start:]
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@classmethod
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def _separate_at_paren(cls, expr, delim):
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def _separate_at_paren(cls, expr, delim=None):
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if delim is None:
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delim = expr and _MATCHING_PARENS[expr[0]]
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separated = list(cls._separate(expr, delim, 1))
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if len(separated) < 2:
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@ -376,7 +380,7 @@ class JSInterpreter(object):
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if expr.startswith('new '):
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obj = expr[4:]
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if obj.startswith('Date('):
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left, right = self._separate_at_paren(obj[4:], ')')
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left, right = self._separate_at_paren(obj[4:])
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expr = unified_timestamp(
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self.interpret_expression(left, local_vars, allow_recursion), False)
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if not expr:
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@ -390,7 +394,7 @@ class JSInterpreter(object):
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return None, should_return
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if expr.startswith('{'):
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inner, outer = self._separate_at_paren(expr, '}')
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inner, outer = self._separate_at_paren(expr)
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# try for object expression (Map)
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sub_expressions = [list(self._separate(sub_expr.strip(), ':', 1)) for sub_expr in self._separate(inner)]
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if all(len(sub_expr) == 2 for sub_expr in sub_expressions):
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@ -406,7 +410,7 @@ class JSInterpreter(object):
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expr = self._dump(inner, local_vars) + outer
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if expr.startswith('('):
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inner, outer = self._separate_at_paren(expr, ')')
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inner, outer = self._separate_at_paren(expr)
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inner, should_abort = self.interpret_statement(inner, local_vars, allow_recursion)
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if not outer or should_abort:
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return inner, should_abort or should_return
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@ -414,57 +418,63 @@ class JSInterpreter(object):
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expr = self._dump(inner, local_vars) + outer
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if expr.startswith('['):
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inner, outer = self._separate_at_paren(expr, ']')
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inner, outer = self._separate_at_paren(expr)
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name = self._named_object(local_vars, [
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self.interpret_expression(item, local_vars, allow_recursion)
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for item in self._separate(inner)])
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expr = name + outer
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m = re.match(r'''(?x)
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(?P<try>try|finally)\s*|
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(?P<catch>catch\s*(?P<err>\(\s*{_NAME_RE}\s*\)))|
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(?P<try>try)\s*\{|
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(?P<switch>switch)\s*\(|
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(?P<for>for)\s*\(|
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'''.format(**globals()), expr)
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(?P<for>for)\s*\(
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''', expr)
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md = m.groupdict() if m else {}
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if md.get('try'):
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if expr[m.end()] == '{':
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try_expr, expr = self._separate_at_paren(expr[m.end():], '}')
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else:
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try_expr, expr = expr[m.end() - 1:], ''
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try_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
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err = None
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try:
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ret, should_abort = self.interpret_statement(try_expr, local_vars, allow_recursion)
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if should_abort:
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return ret, True
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except JS_Throw as e:
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local_vars[self._EXC_NAME] = e.error
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except Exception as e:
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# XXX: This works for now, but makes debugging future issues very hard
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local_vars[self._EXC_NAME] = e
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ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
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return ret, should_abort or should_return
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err = e
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elif md.get('catch'):
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pending = (None, False)
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m = re.match(r'catch\s*(?P<err>\(\s*{_NAME_RE}\s*\))?\{{'.format(**globals()), expr)
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if m:
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sub_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
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if err:
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catch_vars = {}
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if m.group('err'):
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catch_vars[m.group('err')] = err.error if isinstance(err, JS_Throw) else err
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catch_vars = local_vars.new_child(m=catch_vars)
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err = None
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pending = self.interpret_statement(sub_expr, catch_vars, allow_recursion)
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catch_expr, expr = self._separate_at_paren(expr[m.end():], '}')
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if self._EXC_NAME in local_vars:
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catch_vars = local_vars.new_child({m.group('err'): local_vars.pop(self._EXC_NAME)})
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ret, should_abort = self.interpret_statement(catch_expr, catch_vars, allow_recursion)
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m = re.match(r'finally\s*\{', expr)
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if m:
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sub_expr, expr = self._separate_at_paren(expr[m.end() - 1:])
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ret, should_abort = self.interpret_statement(sub_expr, local_vars, allow_recursion)
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if should_abort:
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return ret, True
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ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
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ret, should_abort = pending
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if should_abort:
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return ret, True
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return ret, should_abort or should_return
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if err:
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raise err
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elif md.get('for'):
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constructor, remaining = self._separate_at_paren(expr[m.end() - 1:], ')')
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constructor, remaining = self._separate_at_paren(expr[m.end() - 1:])
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if remaining.startswith('{'):
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body, expr = self._separate_at_paren(remaining, '}')
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body, expr = self._separate_at_paren(remaining)
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else:
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switch_m = re.match(r'switch\s*\(', remaining) # FIXME
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if switch_m:
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switch_val, remaining = self._separate_at_paren(remaining[switch_m.end() - 1:], ')')
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switch_val, remaining = self._separate_at_paren(remaining[switch_m.end() - 1:])
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body, expr = self._separate_at_paren(remaining, '}')
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body = 'switch(%s){%s}' % (switch_val, body)
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else:
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@ -483,11 +493,9 @@ class JSInterpreter(object):
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except JS_Continue:
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pass
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self.interpret_expression(increment, local_vars, allow_recursion)
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ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
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return ret, should_abort or should_return
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elif md.get('switch'):
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switch_val, remaining = self._separate_at_paren(expr[m.end() - 1:], ')')
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switch_val, remaining = self._separate_at_paren(expr[m.end() - 1:])
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switch_val = self.interpret_expression(switch_val, local_vars, allow_recursion)
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body, expr = self._separate_at_paren(remaining, '}')
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items = body.replace('default:', 'case default:').split('case ')[1:]
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@ -510,6 +518,8 @@ class JSInterpreter(object):
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break
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if matched:
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break
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if md:
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ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
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return ret, should_abort or should_return
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@ -618,7 +628,7 @@ class JSInterpreter(object):
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member = self.interpret_expression(m.group('member2'), local_vars, allow_recursion)
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arg_str = expr[m.end():]
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if arg_str.startswith('('):
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arg_str, remaining = self._separate_at_paren(arg_str, ')')
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arg_str, remaining = self._separate_at_paren(arg_str)
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else:
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arg_str, remaining = None, arg_str
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@ -795,7 +805,7 @@ class JSInterpreter(object):
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\((?P<args>[^)]*)\)\s*
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(?P<code>{.+})''' % {'name': re.escape(funcname)},
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self.code)
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code, _ = self._separate_at_paren(func_m.group('code'), '}') # refine the match
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code, _ = self._separate_at_paren(func_m.group('code')) # refine the match
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if func_m is None:
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raise self.Exception('Could not find JS function "{funcname}"'.format(**locals()))
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return self.build_arglist(func_m.group('args')), code
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@ -810,7 +820,7 @@ class JSInterpreter(object):
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if mobj is None:
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break
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start, body_start = mobj.span()
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body, remaining = self._separate_at_paren(code[body_start - 1:], '}')
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body, remaining = self._separate_at_paren(code[body_start - 1:])
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name = self._named_object(
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local_vars,
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self.extract_function_from_code(
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