Make extract_actions.py Python 3 compatible

This commit makes extract_actions.py and its dependencies compatible
with Python 3.8+.

extract_actions.py and its dependencies are still Python 2
compatible.

Bug: 941669
Change-Id: I4038e49449ef0cda8e7801ea49aef7e80a53c9bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531120
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#827107}

tools/metrics/actions/extract_actions.py

@@ -25,7 +25,6 @@ from __future__ import print_function
 
 __author__ = 'evanm (Evan Martin)'
 
-from HTMLParser import HTMLParser
 import logging
 import os
 import re
@@ -33,6 +32,11 @@ import shutil
 import sys
 from xml.dom import minidom
 
+if sys.version_info.major == 2:
+  from HTMLParser import HTMLParser
+else:
+  from html.parser import HTMLParser
+
 import action_utils
 import actions_model
 
@@ -372,7 +376,7 @@ def GrepForActions(path, actions):
       if not action_name:
         break
       actions.add(action_name)
-    except InvalidStatementException, e:
+    except InvalidStatementException as e:
       logging.warning(str(e))
 
   if action_re != USER_METRICS_ACTION_RE:
@@ -439,7 +443,7 @@ def GrepForWebUIActions(path, actions):
     # ensure the path of the file being parsed gets printed if that happens.
     close_called = True
     parser.close()
-  except Exception, e:
+  except Exception as e:
     print("Error encountered for path %s" % path)
     raise e
   finally:
@@ -468,7 +472,7 @@ def GrepForDevToolsActions(path, actions):
       if not action_name:
         break
       actions.add(action_name)
-    except InvalidStatementException, e:
+    except InvalidStatementException as e:
       logging.warning(str(e))
 
 def WalkDirectory(root_path, actions, extensions, callback):

tools/metrics/common/diff_util.py

@@ -10,6 +10,7 @@ from __future__ import print_function
 
 import logging
 import os
+import sys
 import webbrowser
 
 from difflib import HtmlDiff
@@ -38,11 +39,15 @@ def PromptUserToAcceptDiff(old_text, new_text, prompt):
       todesc='Updated', context=True, numlines=5)
   temp = NamedTemporaryFile(suffix='.html', delete=False)
   try:
+    html_diff = html_diff.encode()
     temp.write(html_diff)
     temp.close()  # Close the file so the browser process can access it.
     webbrowser.open('file://' + temp.name)
     print(prompt)
+    if sys.version_info.major == 2:
       response = raw_input('(Y/n): ').strip().lower()
+    else:
+      response = input('(Y/n): ').strip().lower()
   finally:
     temp.close()  # May be called on already closed file.
     os.remove(temp.name)

tools/metrics/common/etree_util.py

@@ -4,6 +4,7 @@
 
 """Utility functions for parsing XML strings into ElementTree nodes."""
 
+import sys
 import xml.etree.ElementTree as ET
 import xml.sax
 
@@ -49,7 +50,7 @@ class _FirstTagFinder(xml.sax.ContentHandler):
 
 
 class _CommentedXMLParser(ET.XMLParser):
-  """An ElementTree builder that preserves comments."""
+  """A Python 2 compatible ElementTree builder that preserves comments."""
 
   def __init__(self, *args, **kwargs):
     super(_CommentedXMLParser, self).__init__(*args, **kwargs)
@@ -91,4 +92,8 @@ def GetTopLevelContent(file_content):
 
 def ParseXMLString(raw_xml):
   """Parses raw_xml and returns an ElementTree node that includes comments."""
+  if sys.version_info.major == 2:
     return ET.fromstring(raw_xml, _CommentedXMLParser())
+  else:
+    return ET.fromstring(
+        raw_xml, ET.XMLParser(target=ET.TreeBuilder(insert_comments=True)))

tools/metrics/common/presubmit_util.py

@@ -62,11 +62,13 @@ def DoPresubmit(argv,
     original_xml = f.read()
 
   # Check there are no CR ('\r') characters in the file.
-  if '\r' in original_xml:
+  if b'\r' in original_xml:
     logging.error('DOS-style line endings (CR characters) detected - these are '
                   'not allowed. Please run dos2unix %s', original_filename)
     return 1
 
+  original_xml = original_xml.decode('utf-8')
+
   try:
     pretty = prettyFn(original_xml)
   except Exception as e:
@@ -98,6 +100,7 @@ def DoPresubmit(argv,
   logging.info('Creating backup file: %s', backup_filename)
   shutil.move(xml_path, os.path.join(xml_dir, backup_filename))
 
+  pretty = pretty.encode('utf-8')
   with open(xml_path, 'wb') as f:
     f.write(pretty)
   logging.info('Updated %s. Don\'t forget to add it to your changelist',

tools/python/google/path_utils.py

@@ -78,7 +78,7 @@ def MaybeMakeDirectory(*path):
   file_path = os.path.join(*path)
   try:
     os.makedirs(file_path)
-  except OSError, e:
+  except OSError as e:
     # errno.EEXIST is "File exists".  If we see another error, re-raise.
     if e.errno != errno.EEXIST:
       raise