diff options
Diffstat (limited to 'youtube_dl/jsinterp.py')
| -rw-r--r-- | youtube_dl/jsinterp.py | 44 |
1 files changed, 39 insertions, 5 deletions
diff --git a/youtube_dl/jsinterp.py b/youtube_dl/jsinterp.py index 449482d3c..ae5bca2e6 100644 --- a/youtube_dl/jsinterp.py +++ b/youtube_dl/jsinterp.py @@ -11,6 +11,7 @@ class JSInterpreter(object): def __init__(self, code): self.code = code self._functions = {} + self._objects = {} def interpret_statement(self, stmt, local_vars, allow_recursion=20): if allow_recursion < 0: @@ -55,11 +56,23 @@ class JSInterpreter(object): m = re.match(r'^(?P<in>[a-z]+)\.(?P<member>.*)$', expr) if m: member = m.group('member') - val = local_vars[m.group('in')] + variable = m.group('in') + + if variable not in local_vars: + if variable not in self._objects: + self._objects[variable] = self.extract_object(variable) + obj = self._objects[variable] + key, args = member.split('(', 1) + args = args.strip(')') + argvals = [int(v) if v.isdigit() else local_vars[v] + for v in args.split(',')] + return obj[key](argvals) + + val = local_vars[variable] if member == 'split("")': return list(val) if member == 'join("")': - return u''.join(val) + return ''.join(val) if member == 'length': return len(val) if member == 'reverse()': @@ -97,9 +110,28 @@ class JSInterpreter(object): return self._functions[fname](argvals) raise ExtractorError('Unsupported JS expression %r' % expr) + def extract_object(self, objname): + obj = {} + obj_m = re.search( + (r'(?:var\s+)?%s\s*=\s*\{' % re.escape(objname)) + + r'\s*(?P<fields>([a-zA-Z$]+\s*:\s*function\(.*?\)\s*\{.*?\})*)' + + r'\}\s*;', + self.code) + fields = obj_m.group('fields') + # Currently, it only supports function definitions + fields_m = re.finditer( + r'(?P<key>[a-zA-Z$]+)\s*:\s*function' + r'\((?P<args>[a-z,]+)\){(?P<code>[^}]+)}', + fields) + for f in fields_m: + argnames = f.group('args').split(',') + obj[f.group('key')] = self.build_function(argnames, f.group('code')) + + return obj + def extract_function(self, funcname): func_m = re.search( - (r'(?:function %s|%s\s*=\s*function)' % ( + (r'(?:function %s|[{;]%s\s*=\s*function)' % ( re.escape(funcname), re.escape(funcname))) + r'\((?P<args>[a-z,]+)\){(?P<code>[^}]+)}', self.code) @@ -107,10 +139,12 @@ class JSInterpreter(object): raise ExtractorError('Could not find JS function %r' % funcname) argnames = func_m.group('args').split(',') + return self.build_function(argnames, func_m.group('code')) + + def build_function(self, argnames, code): def resf(args): local_vars = dict(zip(argnames, args)) - for stmt in func_m.group('code').split(';'): + for stmt in code.split(';'): res = self.interpret_statement(stmt, local_vars) return res return resf - |