Merge pull request #27834 from lc0:converter-line-split

PiperOrigin-RevId: 244888116

tensorflow/tools/compatibility/ipynb.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # =============================================================================
-"""A module to support operation on ipynb files"""
+"""A module to support operations on ipynb files"""
 
 from __future__ import absolute_import
 from __future__ import division
@@ -21,6 +21,7 @@
 import collections
 import copy
 import json
+import re
 import shutil
 import tempfile
 
@@ -62,8 +63,45 @@ def process_file(in_filename, out_filename, upgrader):
   return files_processed, report_text, errors
 
 
+def skip_magic(code_line, magic_list):
+  """Checks if the cell has magic, that is not Python-based.
+
+  Args:
+      code_line: A line of Python code
+      magic_list: A list of jupyter "magic" exceptions
+
+  Returns:
+    If the line jupyter "magic" line, not Python line
+
+   >>> skip_magic('!ls -laF', ['%', '!', '?'])
+  True
+  """
+
+  for magic in magic_list:
+    if code_line.startswith(magic):
+      return True
+
+  return False
+
+
+def check_line_split(code_line):
+  r"""Checks if a line was split with `\`.
+
+  Args:
+      code_line: A line of Python code
+
+  Returns:
+    If the line was split with `\`
+
+  >>> skip_magic("!gcloud ml-engine models create ${MODEL} \\\n")
+  True
+  """
+
+  return re.search(r"\\\s*\n$", code_line)
+
+
 def _get_code(input_file):
-  """Load the ipynb file and return a list of CodeLines."""
+  """Loads the ipynb file and returns a list of CodeLines."""
 
   raw_code = []
 
@@ -75,15 +113,21 @@ def _get_code(input_file):
     if is_python(cell):
       cell_lines = cell["source"]
 
+      is_line_split = False
       for line_idx, code_line in enumerate(cell_lines):
 
         # Sometimes, jupyter has more than python code
         # Idea is to comment these lines, for upgrade time
-        if code_line.startswith("%") or code_line.startswith("!") \
-            or code_line.startswith("?"):
+        if skip_magic(code_line, ["%", "!", "?"]) or is_line_split:
           # Found a special character, need to "encode"
           code_line = "###!!!" + code_line
 
+          # if this cell ends with `\` -> skip the next line
+          is_line_split = check_line_split(code_line)
+
+        if is_line_split:
+          is_line_split = check_line_split(code_line)
+
         # Sometimes, people leave \n at the end of cell
         # in order to migrate only related things, and make the diff
         # the smallest -> here is another hack
@@ -102,7 +146,7 @@ def _get_code(input_file):
 
 
 def _update_notebook(original_notebook, original_raw_lines, updated_code_lines):
-  """Update notebook, once migration is done."""
+  """Updates notebook, once migration is done."""
 
   new_notebook = copy.deepcopy(original_notebook)