GN files for running Closure Compiler

third_party/closure_compiler/compile2.py

Index: third_party/closure_compiler/compile2.py
diff --git a/third_party/closure_compiler/compile2.py b/third_party/closure_compiler/compile2.py
index dfd22cfe26700adbec40eaeb000337cc5a474319..ff14b9dc016da6fdd98385d64707ed451ac3dcf2 100755
--- a/third_party/closure_compiler/compile2.py
+++ b/third_party/closure_compiler/compile2.py
@@ -188,7 +188,12 @@ class Checker(object):
       tmp_file.write(contents)
     return tmp_file.name
 
-  def check(self, sources, out_file=None, runner_args=None, closure_args=None,
+  def check(self,
+            sources,
+            gn_source_list_file=None,
+            out_file=None,
+            runner_args=None,
+            closure_args=None,
             custom_sources=True):
     """Closure compile |sources| while checking for errors.
 
@@ -208,6 +213,18 @@ class Checker(object):
     """
     is_extern = lambda f: 'extern' in f
     externs_and_deps = [self._POLYMER_EXTERNS]
+    
+    # Convert the sources to absolute paths to make comparisons easy.
+    sources = map(os.path.abspath, sources)
+    # Process the source list.
+    if gn_source_list_file:
+      with open(gn_source_list_file) as f:
+        listed_sources = f.read().splitlines()
+        # Ignore the first line, GN puts the output file name here
+        listed_sources = listed_sources[1:]
+        listed_sources = map(os.path.abspath, listed_sources)
+        # Concatenate onto sources, removing duplicates
+        sources += [x for x in listed_sources if x not in sources]
 
     if custom_sources:
       externs_and_deps += sources
@@ -306,6 +323,11 @@ if __name__ == "__main__":
       description="Typecheck JavaScript using Closure compiler")
   parser.add_argument("sources", nargs=argparse.ONE_OR_MORE,
                       help="Path to a source file to typecheck")
+  parser.add_argument(
+      "--gn_source_list_file",
+      help="""A file generated by GN containing a list of
+              additional sources. Due to an oddity in how this is
+              generated the first line is ignored""")
   parser.add_argument("--custom_sources", action="store_true",
                       help="Whether this rules has custom sources.")
   parser.add_argument("-o", "--out_file",
@@ -320,7 +342,9 @@ if __name__ == "__main__":
 
   checker = Checker(verbose=opts.verbose)
 
-  found_errors, stderr = checker.check(opts.sources, out_file=opts.out_file,
+  found_errors, stderr = checker.check(opts.sources,
+                                       gn_source_list_file=opts.gn_source_list_file,
+                                       out_file=opts.out_file,
                                        closure_args=opts.closure_args,
                                        runner_args=opts.runner_args,
                                        custom_sources=opts.custom_sources)