DevTools: scripts: remove manual path concatenation / splitting

Source/devtools/PRESUBMIT.py

 # Copyright (C) 2014 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 14 matching lines @@
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 """DevTools JSDoc validator presubmit script
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
-import os
-import re
 import sys
 
 
 def _CompileDevtoolsFrontend(input_api, output_api):
     # FIXME: Make this run on other platforms as well.
     if not input_api.platform.startswith('linux'):
         return []
     local_paths = [f.LocalPath() for f in input_api.AffectedFiles()]
 
     # FIXME: The compilation does not actually run if injected script-related files
     # have changed, as they reside in core/inspector, which is not affected
     # by this presubmit.
     # Once this is fixed, InjectedScriptHost.idl and JavaScriptCallFrame.idl
     # should be added to the list of triggers.
-    if (any("devtools/front_end" in path for path in local_paths) or
+    devtools_front_end = input_api.os_path.join("devtools", "front_end")
+    if (any(devtools_front_end in path for path in local_paths) or
         any("protocol.json" in path for path in local_paths) or
         any("InjectedScriptSource.js" in path for path in local_paths) or
         any("InjectedScriptCanvasModuleSource.js" in path for path in local_paths)):
         lint_path = input_api.os_path.join(input_api.PresubmitLocalPath(),
             "scripts", "compile_frontend.py")
         out, _ = input_api.subprocess.Popen(
             [input_api.python_executable, lint_path],
             stdout=input_api.subprocess.PIPE,
             stderr=input_api.subprocess.STDOUT).communicate()
         if "WARNING" in out or "ERROR" in out:
             return [output_api.PresubmitError(out)]
     return []
 
 
 def _CheckConvertSVGToPNGHashes(input_api, output_api):
     if not input_api.platform.startswith('linux'):
         return []
 
     original_sys_path = sys.path
     try:
         sys.path = sys.path + [input_api.os_path.join(input_api.PresubmitLocalPath(), 'scripts')]
         import devtools_file_hashes
     finally:
         sys.path = original_sys_path
 
     absolute_local_paths = [af.AbsoluteLocalPath() for af in input_api.AffectedFiles(include_deletes=False)]
-    image_source_file_paths = [path for path in absolute_local_paths if "devtools/front_end/Images/src" in path and path.endswith(".svg")]
+    images_src_path = input_api.os_path.join("devtools", "front_end", "Images", "src")
+    image_source_file_paths = [path for path in absolute_local_paths if images_src_path in path and path.endswith(".svg")]
     image_sources_path = input_api.os_path.join(input_api.PresubmitLocalPath(), "front_end", "Images", "src")
     hashes_file_name = "svg2png.hashes"
-    hashes_file_path = image_sources_path + "/" + hashes_file_name
+    hashes_file_path = input_api.os_path.join(image_sources_path, hashes_file_name)
     invalid_hash_file_paths = devtools_file_hashes.files_with_invalid_hashes(hashes_file_path, image_source_file_paths)
     if len(invalid_hash_file_paths) == 0:
         return []
-    invalid_hash_file_names = [re.sub(".*/", "", file_path) for file_path in invalid_hash_file_paths]
+    invalid_hash_file_names = [input_api.os_path.basename(file_path) for file_path in invalid_hash_file_paths]
     file_paths_str = ", ".join(invalid_hash_file_names)
     error_message = "The following SVG files should be converted to PNG using convert_svg_images_png.py script before uploading: \n  - %s" % file_paths_str
     return [output_api.PresubmitError(error_message)]
 
 
 def _CheckOptimizePNGHashes(input_api, output_api):
     if not input_api.platform.startswith('linux'):
         return []
 
     original_sys_path = sys.path
     try:
         sys.path = sys.path + [input_api.os_path.join(input_api.PresubmitLocalPath(), 'scripts')]
         import devtools_file_hashes
     finally:
         sys.path = original_sys_path
 
     absolute_local_paths = [af.AbsoluteLocalPath() for af in input_api.AffectedFiles(include_deletes=False)]
-    image_source_file_paths = [path for path in absolute_local_paths if "devtools/front_end/Images/src" in path and path.endswith(".svg")]
+    images_src_path = input_api.os_path.join("devtools", "front_end", "Images", "src")
+    image_source_file_paths = [path for path in absolute_local_paths if images_src_path in path and path.endswith(".svg")]
     image_sources_path = input_api.os_path.join(input_api.PresubmitLocalPath(), "front_end", "Images", "src")
     hashes_file_name = "optimize_png.hashes"
-    hashes_file_path = image_sources_path + "/" + hashes_file_name
+    hashes_file_path = input_api.os_path.join(image_sources_path, hashes_file_name)
     invalid_hash_file_paths = devtools_file_hashes.files_with_invalid_hashes(hashes_file_path, image_source_file_paths)
     if len(invalid_hash_file_paths) == 0:
         return []
-    invalid_hash_file_names = [re.sub(".*/", "", file_path) for file_path in invalid_hash_file_paths]
+    invalid_hash_file_names = [input_api.os_path.basename(file_path) for file_path in invalid_hash_file_paths]
     file_paths_str = ", ".join(invalid_hash_file_names)
     error_message = "The following PNG files should be optimized using optimize_png_images.py script before uploading: \n  - %s" % file_paths_str
     return [output_api.PresubmitError(error_message)]
 
 
 def CheckChangeOnUpload(input_api, output_api):
     results = []
     results.extend(_CompileDevtoolsFrontend(input_api, output_api))
     results.extend(_CheckConvertSVGToPNGHashes(input_api, output_api))
     results.extend(_CheckOptimizePNGHashes(input_api, output_api))
     return results
 
 
 def CheckChangeOnCommit(input_api, output_api):
     return []