Output closure-compiled JavaScript files

third_party/closure_compiler/checker.py

Index: third_party/closure_compiler/checker.py
diff --git a/third_party/closure_compiler/checker.py b/third_party/closure_compiler/checker.py
index 2eb9e68a21f606fc41e3e6ba4859649483138d13..2795825f846840553632caf925b15eb4eec7454f 100755
--- a/third_party/closure_compiler/checker.py
+++ b/third_party/closure_compiler/checker.py
@@ -44,6 +44,8 @@ class Checker(object):
     "--jscomp_error=visibility",
     "--language_in=ECMASCRIPT5_STRICT",
     "--summary_detail_level=3",
+    "--compilation_level=WHITESPACE_ONLY",
+    "--source_map_format=V3",
   ]
 
   # These are the extra flags used when compiling in 'strict' mode.
@@ -177,11 +179,14 @@ class Checker(object):
       tmp_file.write(contents)
     return tmp_file.name
 
-  def run_js_check(self, sources, externs=None):
+  def run_js_check(self, sources, out_file, externs=None):
     if not self._check_java_path():
       return 1, ""
 
     args = ["--js=%s" % s for s in sources]
+    args += ["--js_output_file=%s" % out_file]
+    args += ["--create_source_map=%s.map" % out_file]
+
     if externs:
       args += ["--externs=%s" % e for e in externs]
     args_file_content = " %s" % " ".join(self._common_args() + args)
@@ -201,7 +206,7 @@ class Checker(object):
 
     return errors, stderr
 
-  def check(self, source_file, depends=None, externs=None):
+  def check(self, source_file, out_file, depends=None, externs=None):
     """Closure compile a file and check for errors.
 
     Args:
@@ -240,7 +245,8 @@ class Checker(object):
     self._expanded_file = self._create_temp_file(self._processor.contents)
     self._debug("Expanded file: %s" % self._expanded_file)
 
-    errors, stderr = self.run_js_check([self._expanded_file], externs)
+    errors, stderr = self.run_js_check([self._expanded_file], out_file,
+                                       externs)
 
     # Filter out false-positive promise chain errors.
     # See https://github.com/google/closure-compiler/issues/715 for details.
@@ -304,16 +310,11 @@ if __name__ == "__main__":
           source,
           depends,
           externs)
-      has_errors, _ = checker.check(source, depends=depends, externs=externs)
+      has_errors, _ = checker.check(source, opts.out_file, depends=depends,
+                                    externs=externs)
       if has_errors:
         sys.exit(1)
 
-      if opts.out_file:
-        out_dir = os.path.dirname(opts.out_file)
-        if not os.path.exists(out_dir):
-          os.makedirs(out_dir)

[Dan Beam, 2015/03/06 19:58:55]

still need to do this somewhere

$ echo 'alert( 1 );' | java -jar compiler.jar
--js_output_file=i/totally/dont/exist.js

java.io.FileNotFoundException: i/totally/dont/exist.js (No such file or
directory)

[Theresa, 2015/03/06 20:30:30]

Done.

-        # TODO(dbeam): write compiled file to |opts.out_file|.
-        open(opts.out_file, "w").write("")
   else:
     has_errors, errors = checker.check_multiple(opts.sources)
     if has_errors: