move parsing.PushBackIterator and parsing.indent_block to common

jedi/common.py

@@ -0,0 +1,47 @@
+""" A universal module with functions / classes without dependencies. """
+import contextlib
+
+import settings
+
+
+class PushBackIterator(object):
+    def __init__(self, iterator):
+        self.pushes = []
+        self.iterator = iterator
+
+    def push_back(self, value):
+        self.pushes.append(value)
+
+    def __iter__(self):
+        return self
+
+    def next(self):
+        """ Python 2 Compatibility """
+        return self.__next__()
+
+    def __next__(self):
+        if self.pushes:
+            return self.pushes.pop()
+        else:
+            return next(self.iterator)
+
+
+@contextlib.contextmanager
+def scale_speed_settings(factor):
+    a = settings.max_executions
+    b = settings.max_until_execution_unique
+    settings.max_executions *= factor
+    settings.max_until_execution_unique *= factor
+    yield
+    settings.max_executions = a
+    settings.max_until_execution_unique = b
+
+
+def indent_block(text, indention='    '):
+    """ This function indents a text block with a default of four spaces """
+    temp = ''
+    while text and text[-1] == '\n':
+        temp += text[-1]
+        text = text[:-1]
+    lines = text.split('\n')
+    return '\n'.join(map(lambda s: indention + s, lines)) + temp