Example of refactoring using rope library.

tools/telemetry/third_party/rope/rope/base/simplify.py

Index: tools/telemetry/third_party/rope/rope/base/simplify.py
diff --git a/tools/telemetry/third_party/rope/rope/base/simplify.py b/tools/telemetry/third_party/rope/rope/base/simplify.py
new file mode 100644
index 0000000000000000000000000000000000000000..bc4cade4ab910989e3143c17df1180a2770794b9
--- /dev/null
+++ b/tools/telemetry/third_party/rope/rope/base/simplify.py
@@ -0,0 +1,55 @@
+"""A module to ease code analysis
+
+This module is here to help source code analysis.
+"""
+import re
+
+from rope.base import codeanalyze, utils
+
+
+@utils.cached(7)
+def real_code(source):
+    """Simplify `source` for analysis
+
+    It replaces:
+
+    * comments with spaces
+    * strs with a new str filled with spaces
+    * implicit and explicit continuations with spaces
+    * tabs and semicolons with spaces
+
+    The resulting code is a lot easier to analyze if we are interested
+    only in offsets.
+    """
+    collector = codeanalyze.ChangeCollector(source)
+    for start, end in ignored_regions(source):
+        if source[start] == '#':
+            replacement = ' ' * (end - start)
+        else:
+            replacement = '"%s"' % (' ' * (end - start - 2))
+        collector.add_change(start, end, replacement)
+    source = collector.get_changed() or source
+    collector = codeanalyze.ChangeCollector(source)
+    parens = 0
+    for match in _parens.finditer(source):
+        i = match.start()
+        c = match.group()
+        if c in '({[':
+            parens += 1
+        if c in ')}]':
+            parens -= 1
+        if c == '\n' and parens > 0:
+            collector.add_change(i, i + 1, ' ')
+    source = collector.get_changed() or source
+    return source.replace('\\\n', '  ').replace('\t', ' ').replace(';', '\n')
+
+
+@utils.cached(7)
+def ignored_regions(source):
+    """Return ignored regions like strings and comments in `source` """
+    return [(match.start(), match.end()) for match in _str.finditer(source)]
+
+
+_str = re.compile('%s|%s' % (codeanalyze.get_comment_pattern(),
+                             codeanalyze.get_string_pattern()))
+_parens = re.compile(r'[\({\[\]}\)\n]')