Simplify IPythonInputSplitter API

IPython/core/inputsplitter.py

@@ -536,14 +536,13 b' class IPythonInputSplitter(InputSplitter):'
         self.transformer_accumulating = False
         self.within_python_line = False
 
-        last_exc = None
         for t in self.transforms:
             try:
                 t.reset()
-            except SyntaxError as e:
-                last_exc = e
-        if last_exc is not None:
-            raise last_exc
+            except SyntaxError:
+                # Nothing that calls reset() expects to handle transformer
+                # errors
+                pass
     
     def flush_transformers(self):
         def _flush(transform, out):
@@ -560,18 +559,19 b' class IPythonInputSplitter(InputSplitter):'
         if out is not None:
             self._store(out)
 
-    def source_raw_reset(self):
-        """Return input and raw source and perform a full reset.
+    def raw_reset(self):
+        """Return raw input only and perform a full reset.
         """
-        self.flush_transformers()
-        out = self.source
-        out_r = self.source_raw
+        out = self.source_raw
         self.reset()
-        return out, out_r
+        return out
     
     def source_reset(self):
+        try:
         self.flush_transformers()
-        return super(IPythonInputSplitter, self).source_reset()
+            return self.source
+        finally:
+            self.reset()
 
     def push_accepts_more(self):
         if self.transformer_accumulating:
@@ -583,8 +583,12 b' class IPythonInputSplitter(InputSplitter):'
         """Process and translate a cell of input.
         """
         self.reset()
+        try:
         self.push(cell)
-        return self.source_reset()
+            self.flush_transformers()
+            return self.source
+        finally:
+            self.reset()
 
     def push(self, lines):
         """Push one or more lines of IPython input.

IPython/core/interactiveshell.py

@@ -2635,8 +2635,7 b' class InteractiveShell(SingletonConfigurable):'
         preprocessing_exc_tuple = None
         try:
             # Static input transformations
-            self.input_transformer_manager.push(raw_cell)
-            cell = self.input_transformer_manager.source_reset()
+            cell = self.input_transformer_manager.transform_cell(raw_cell)
         except SyntaxError:
             preprocessing_exc_tuple = sys.exc_info()
             cell = raw_cell  # cell has to exist so it can be stored/logged

IPython/core/tests/test_inputsplitter.py

@@ -412,7 +412,8 b' class IPythonInputTestCase(InputSplitterTestCase):'
                     continue
 
                 isp.push(raw+'\n')
-                out, out_raw = isp.source_raw_reset()
+                out_raw = isp.source_raw
+                out = isp.source_reset()
                 self.assertEqual(out.rstrip(), out_t,
                         tt.pair_fail_msg.format("inputsplitter",raw, out_t, out))
                 self.assertEqual(out_raw.rstrip(), raw.rstrip())
@@ -431,7 +432,8 b' class IPythonInputTestCase(InputSplitterTestCase):'
                         isp.push(lraw)
                         raw_parts.append(lraw)
 
-                out, out_raw = isp.source_raw_reset()
+                out_raw = isp.source_raw
+                out = isp.source_reset()
                 out_t = '\n'.join(out_t_parts).rstrip()
                 raw = '\n'.join(raw_parts).rstrip()
                 self.assertEqual(out.rstrip(), out_t)
@@ -498,7 +500,8 b" if __name__ == '__main__':"
             # Here we just return input so we can use it in a test suite, but a
             # real interpreter would instead send it for execution somewhere.
             #src = isp.source; raise EOFError # dbg
-            src, raw = isp.source_raw_reset()
+            raw = isp.source_raw
+            src = isp.source_reset()
             print('Input source was:\n', src)
             print('Raw source was:\n', raw)
     except EOFError:
@@ -545,9 +548,7 b' class CellMagicsCommon(object):'
 
     def test_whole_cell(self):
         src = "%%cellm line\nbody\n"
-        sp = self.sp
-        sp.push(src)
-        out = sp.source_reset()
+        out = self.sp.transform_cell(src)
         ref = u"get_ipython().run_cell_magic({u}'cellm', {u}'line', {u}'body')\n"
         nt.assert_equal(out, py3compat.u_format(ref))
     

IPython/qt/console/frontend_widget.py

@@ -204,10 +204,7 b' class FrontendWidget(HistoryConsoleWidget, BaseFrontendMixin):'
             prompt created. When triggered by an Enter/Return key press,
             'interactive' is True; otherwise, it is False.
         """
-        try:
             self._input_splitter.reset()
-        except SyntaxError:
-            pass
         try:
             complete = self._input_splitter.push(source)
         except SyntaxError:
@@ -239,10 +236,7 b' class FrontendWidget(HistoryConsoleWidget, BaseFrontendMixin):'
         """
         # Flush all state from the input splitter so the next round of
         # reading input starts with a clean buffer.
-        try:
             self._input_splitter.reset()
-        except SyntaxError:
-            pass
 
         if not self._reading:
             self._highlighter.highlighting_on = False

IPython/sphinxext/ipython_directive.py

@@ -258,7 +258,7 b' class EmbeddedSphinxShell(object):'
             splitter.push(line)
             more = splitter.push_accepts_more()
             if not more:
-                source_raw = splitter.source_raw_reset()[1]
+                source_raw = splitter.raw_reset()
                 self.IP.run_cell(source_raw, store_history=store_history)
         finally:
             sys.stdout = stdout

IPython/terminal/console/interactiveshell.py

@@ -455,7 +455,7 b' class ZMQTerminalInteractiveShell(TerminalInteractiveShell):'
                 #double-guard against keyboardinterrupts during kbdint handling
                 try:
                     self.write('\nKeyboardInterrupt\n')
-                    source_raw = self.input_splitter.source_raw_reset()[1]
+                    source_raw = self.input_splitter.raw_reset()
                     hlen_b4_cell = self._replace_rlhist_multiline(source_raw, hlen_b4_cell)
                     more = False
                 except KeyboardInterrupt:
@@ -483,7 +483,7 b' class ZMQTerminalInteractiveShell(TerminalInteractiveShell):'
                     self.autoedit_syntax):
                     self.edit_syntax_error()
                 if not more:
-                    source_raw = self.input_splitter.source_raw_reset()[1]
+                    source_raw = self.input_splitter.raw_reset()
                     hlen_b4_cell = self._replace_rlhist_multiline(source_raw, hlen_b4_cell)
                     self.run_cell(source_raw)
                 

IPython/terminal/interactiveshell.py

@@ -518,7 +518,7 b' class TerminalInteractiveShell(InteractiveShell):'
                 #double-guard against keyboardinterrupts during kbdint handling
                 try:
                     self.write('\nKeyboardInterrupt\n')
-                    source_raw = self.input_splitter.source_raw_reset()[1]
+                    source_raw = self.input_splitter.raw_reset()
                     hlen_b4_cell = \
                         self._replace_rlhist_multiline(source_raw, hlen_b4_cell)
                     more = False
@@ -552,7 +552,7 b' class TerminalInteractiveShell(InteractiveShell):'
                     self.autoedit_syntax):
                     self.edit_syntax_error()
                 if not more:
-                    source_raw = self.input_splitter.source_raw_reset()[1]
+                    source_raw = self.input_splitter.raw_reset()
                     self.run_cell(source_raw, store_history=True)
                     hlen_b4_cell = \
                         self._replace_rlhist_multiline(source_raw, hlen_b4_cell)