Merge branch 'modular-data-extract'

Commits in this branch are prefixed with "Extraction:"
This branch refactors data extraction. All such functionality has been moved to the yt_data_extract module.
Responses from requests are given to the module and it parses them into a consistent, more useful format.
The dependency on youtube-dl has also been dropped and this functionality has been built from scratch for these reasons:
(1) I've noticed youtube-dl breaks more often than invidious (which uses watch page extraction built from scratch) in response to changes from Youtube, so I'm hoping what I wrote will also be less brittle.
(2) Such breakage is inconvenient because I have to manually merge the fixes since I had to make changes to youtube-dl to make it do things such as extracting related videos.
(3) I have no control over error handling and request pooling with youtube-dl, since it does all the requests (these would require intrusive changes I don't want to maintain).
(4) I will now be able to finally display the number of comments and whether comments are disabled without making additional requests.

1 files changed, 0 insertions, 262 deletions

diff --git a/youtube_dl/jsinterp.py b/youtube_dl/jsinterp.py
deleted file mode 100644
index 7bda596..0000000
--- a/youtube_dl/jsinterp.py
+++ /dev/null
@@ -1,262 +0,0 @@
-from __future__ import unicode_literals
-
-import json
-import operator
-import re
-
-from .utils import (
-    ExtractorError,
-    remove_quotes,
-)
-
-_OPERATORS = [
-    ('|', operator.or_),
-    ('^', operator.xor),
-    ('&', operator.and_),
-    ('>>', operator.rshift),
-    ('<<', operator.lshift),
-    ('-', operator.sub),
-    ('+', operator.add),
-    ('%', operator.mod),
-    ('/', operator.truediv),
-    ('*', operator.mul),
-]
-_ASSIGN_OPERATORS = [(op + '=', opfunc) for op, opfunc in _OPERATORS]
-_ASSIGN_OPERATORS.append(('=', lambda cur, right: right))
-
-_NAME_RE = r'[a-zA-Z_$][a-zA-Z_$0-9]*'
-
-
-class JSInterpreter(object):
-    def __init__(self, code, objects=None):
-        if objects is None:
-            objects = {}
-        self.code = code
-        self._functions = {}
-        self._objects = objects
-
-    def interpret_statement(self, stmt, local_vars, allow_recursion=100):
-        if allow_recursion < 0:
-            raise ExtractorError('Recursion limit reached')
-
-        should_abort = False
-        stmt = stmt.lstrip()
-        stmt_m = re.match(r'var\s', stmt)
-        if stmt_m:
-            expr = stmt[len(stmt_m.group(0)):]
-        else:
-            return_m = re.match(r'return(?:\s+|$)', stmt)
-            if return_m:
-                expr = stmt[len(return_m.group(0)):]
-                should_abort = True
-            else:
-                # Try interpreting it as an expression
-                expr = stmt
-
-        v = self.interpret_expression(expr, local_vars, allow_recursion)
-        return v, should_abort
-
-    def interpret_expression(self, expr, local_vars, allow_recursion):
-        expr = expr.strip()
-        if expr == '':  # Empty expression
-            return None
-
-        if expr.startswith('('):
-            parens_count = 0
-            for m in re.finditer(r'[()]', expr):
-                if m.group(0) == '(':
-                    parens_count += 1
-                else:
-                    parens_count -= 1
-                    if parens_count == 0:
-                        sub_expr = expr[1:m.start()]
-                        sub_result = self.interpret_expression(
-                            sub_expr, local_vars, allow_recursion)
-                        remaining_expr = expr[m.end():].strip()
-                        if not remaining_expr:
-                            return sub_result
-                        else:
-                            expr = json.dumps(sub_result) + remaining_expr
-                        break
-            else:
-                raise ExtractorError('Premature end of parens in %r' % expr)
-
-        for op, opfunc in _ASSIGN_OPERATORS:
-            m = re.match(r'''(?x)
-                (?P<out>%s)(?:\[(?P<index>[^\]]+?)\])?
-                \s*%s
-                (?P<expr>.*)$''' % (_NAME_RE, re.escape(op)), expr)
-            if not m:
-                continue
-            right_val = self.interpret_expression(
-                m.group('expr'), local_vars, allow_recursion - 1)
-
-            if m.groupdict().get('index'):
-                lvar = local_vars[m.group('out')]
-                idx = self.interpret_expression(
-                    m.group('index'), local_vars, allow_recursion)
-                assert isinstance(idx, int)
-                cur = lvar[idx]
-                val = opfunc(cur, right_val)
-                lvar[idx] = val
-                return val
-            else:
-                cur = local_vars.get(m.group('out'))
-                val = opfunc(cur, right_val)
-                local_vars[m.group('out')] = val
-                return val
-
-        if expr.isdigit():
-            return int(expr)
-
-        var_m = re.match(
-            r'(?!if|return|true|false)(?P<name>%s)$' % _NAME_RE,
-            expr)
-        if var_m:
-            return local_vars[var_m.group('name')]
-
-        try:
-            return json.loads(expr)
-        except ValueError:
-            pass
-
-        m = re.match(
-            r'(?P<in>%s)\[(?P<idx>.+)\]$' % _NAME_RE, expr)
-        if m:
-            val = local_vars[m.group('in')]
-            idx = self.interpret_expression(
-                m.group('idx'), local_vars, allow_recursion - 1)
-            return val[idx]
-
-        m = re.match(
-            r'(?P<var>%s)(?:\.(?P<member>[^(]+)|\[(?P<member2>[^]]+)\])\s*(?:\(+(?P<args>[^()]*)\))?$' % _NAME_RE,
-            expr)
-        if m:
-            variable = m.group('var')
-            member = remove_quotes(m.group('member') or m.group('member2'))
-            arg_str = m.group('args')
-
-            if variable in local_vars:
-                obj = local_vars[variable]
-            else:
-                if variable not in self._objects:
-                    self._objects[variable] = self.extract_object(variable)
-                obj = self._objects[variable]
-
-            if arg_str is None:
-                # Member access
-                if member == 'length':
-                    return len(obj)
-                return obj[member]
-
-            assert expr.endswith(')')
-            # Function call
-            if arg_str == '':
-                argvals = tuple()
-            else:
-                argvals = tuple([
-                    self.interpret_expression(v, local_vars, allow_recursion)
-                    for v in arg_str.split(',')])
-
-            if member == 'split':
-                assert argvals == ('',)
-                return list(obj)
-            if member == 'join':
-                assert len(argvals) == 1
-                return argvals[0].join(obj)
-            if member == 'reverse':
-                assert len(argvals) == 0
-                obj.reverse()
-                return obj
-            if member == 'slice':
-                assert len(argvals) == 1
-                return obj[argvals[0]:]
-            if member == 'splice':
-                assert isinstance(obj, list)
-                index, howMany = argvals
-                res = []
-                for i in range(index, min(index + howMany, len(obj))):
-                    res.append(obj.pop(index))
-                return res
-
-            return obj[member](argvals)
-
-        for op, opfunc in _OPERATORS:
-            m = re.match(r'(?P<x>.+?)%s(?P<y>.+)' % re.escape(op), expr)
-            if not m:
-                continue
-            x, abort = self.interpret_statement(
-                m.group('x'), local_vars, allow_recursion - 1)
-            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(
-            r'^(?P<func>%s)\((?P<args>[a-zA-Z0-9_$,]*)\)$' % _NAME_RE, expr)
-        if m:
-            fname = m.group('func')
-            argvals = tuple([
-                int(v) if v.isdigit() else local_vars[v]
-                for v in m.group('args').split(',')]) if len(m.group('args')) > 0 else tuple()
-            if fname not in self._functions:
-                self._functions[fname] = self.extract_function(fname)
-            return self._functions[fname](argvals)
-
-        raise ExtractorError('Unsupported JS expression %r' % expr)
-
-    def extract_object(self, objname):
-        _FUNC_NAME_RE = r'''(?:[a-zA-Z$0-9]+|"[a-zA-Z$0-9]+"|'[a-zA-Z$0-9]+')'''
-        obj = {}
-        obj_m = re.search(
-            r'''(?x)
-                (?<!this\.)%s\s*=\s*{\s*
-                    (?P<fields>(%s\s*:\s*function\s*\(.*?\)\s*{.*?}(?:,\s*)?)*)
-                }\s*;
-            ''' % (re.escape(objname), _FUNC_NAME_RE),
-            self.code)
-        fields = obj_m.group('fields')
-        # Currently, it only supports function definitions
-        fields_m = re.finditer(
-            r'''(?x)
-                (?P<key>%s)\s*:\s*function\s*\((?P<args>[a-z,]+)\){(?P<code>[^}]+)}
-            ''' % _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'))
-
-        return obj
-
-    def extract_function(self, funcname):
-        func_m = re.search(
-            r'''(?x)
-                (?:function\s+%s|[{;,]\s*%s\s*=\s*function|var\s+%s\s*=\s*function)\s*
-                \((?P<args>[^)]*)\)\s*
-                \{(?P<code>[^}]+)\}''' % (
-                re.escape(funcname), re.escape(funcname), re.escape(funcname)),
-            self.code)
-        if func_m is None:
-            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 call_function(self, funcname, *args):
-        f = self.extract_function(funcname)
-        return f(args)
-
-    def build_function(self, argnames, code):
-        def resf(args):
-            local_vars = dict(zip(argnames, args))
-            for stmt in code.split(';'):
-                res, abort = self.interpret_statement(stmt, local_vars)
-                if abort:
-                    break
-            return res
-        return resf