GN files for running Closure Compiler

third_party/closure_compiler/compile_js2.gni

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("closure_args.gni")
+
+template("compile_js") {
+  # This template optionally takes these arguments:
+  # - sources: a list of all of the source files to be compiled.
+  #            If sources is undefined, a default of ['<(_target_name).js']
+  #            is created (this probably suffices for many targets).
+  # - out_file: a file where the compiled output is written to. The default
+  #             is gen/closure/<path to |target_name|>/|target_name|.js.
+  # - script_args: additional arguments to pass to compile.py.
+  # - closure_args: additional arguments to pass to the Closure compiler.
+  # - disabled_closure_args: additional arguments dealing with the
+  #                          strictness of compilation; Non-strict
+  #                          defaults are provided that can be overriden.
+  # - externs: externs required to compile the sources, without the .js
+  #            extension
+  # - interfaces: interfaces required to compile the sources, without the
+  #               .js extension
+  forward_variables_from(invoker,
+                         [
+                           "sources",
+                           "out_file",
+                           "script_args",
+                           "closure_args",
+                           "runner_args",
+                           "disabled_closure_args",
+                           "externs",
+                           "interfaces",
+                         ])
+
+  CLOSURE_DIR = "//third_party/closure_compiler"
+
+  action(target_name) {
+    assert(defined(sources))
+    if (!defined(runner_args)) {
+      runner_args = [ "enable-chrome-pass" ]
+    }
+    if (!defined(script_args)) {
+      script_args = []
+    }
+    if (!defined(closure_args)) {
+      closure_args = common_closure_args + checking_closure_args
+    }
+    if (!defined(disabled_closure_args)) {
+      disabled_closure_args = default_disabled_closure_args
+    }
+    if (!defined(out_file)) {
+      out_file = "${target_gen_dir}/closure/${target_name}.js"
+    }
+    inputs = [
+      "${CLOSURE_DIR}/compile.py",
+      "${CLOSURE_DIR}/processor.py",
+      "${CLOSURE_DIR}/build/inputs.py",
+      "${CLOSURE_DIR}/build/outputs.py",
+      "${CLOSURE_DIR}/compiler/compiler.jar",
+      "${CLOSURE_DIR}/runner/runner.jar",
+    ]
+    if (defined(exters)) {

[Dan Beam, 2016/08/17 18:24:21]

externs

[aberent, 2016/08/18 16:08:52]

Done.

+      EXTERNS_DIR = "${CLOSURE_DIR}/externs"
+      for_each(extern, externs) {
+        sources += [ "$EXTERNS_DIR/$extern" ]
+      }
+    }
+    if (defined(interfaces)) {
+      INTERFACES_DIR = "${CLOSURE_DIR}/interfaces"
+      for_each(interface, interfaces) {
+        sources += [ "$INTERFACES_DIR/$interface" ]
+      }
+    }
+    outputs = [
+      out_file,
+    ]
+    script = "${CLOSURE_DIR}/compile2.py"
+    args = script_args + rebase_path(sources)
+    args += [
+      "--out_file",
+      rebase_path(out_file),
+    ]
+    args += [ "--runner_args" ] + runner_args
+    args += [ "--closure_args" ] + closure_args + disabled_closure_args
+  }
+}