1 files changed, 42 insertions, 0 deletions
diff --git a/platform/javascript/emscripten_helpers.py b/platform/javascript/emscripten_helpers.py
new file mode 100644
index 0000000000..d08555916b
--- /dev/null
+++ b/platform/javascript/emscripten_helpers.py
@@ -0,0 +1,42 @@
+import os
+
+from SCons.Util import WhereIs
+
+
+def run_closure_compiler(target, source, env, for_signature):
+    closure_bin = os.path.join(os.path.dirname(WhereIs("emcc")), "node_modules", ".bin", "google-closure-compiler")
+    cmd = [WhereIs("node"), closure_bin]
+    cmd.extend(["--compilation_level", "ADVANCED_OPTIMIZATIONS"])
+    for f in env["JSEXTERNS"]:
+        cmd.extend(["--externs", f.get_abspath()])
+    for f in source:
+        cmd.extend(["--js", f.get_abspath()])
+    cmd.extend(["--js_output_file", target[0].get_abspath()])
+    return " ".join(cmd)
+
+
+def get_build_version(env):
+    import version
+
+    name = "custom_build"
+    if os.getenv("BUILD_NAME") != None:
+        name = os.getenv("BUILD_NAME")
+    return "%d.%d.%d.%s.%s" % (version.major, version.minor, version.patch, version.status, name)
+
+
+def create_engine_file(env, target, source, externs):
+    if env["use_closure_compiler"]:
+        return env.BuildJS(target, source, JSEXTERNS=externs)
+    return env.Textfile(target, [env.File(s) for s in source])
+
+
+def add_js_libraries(env, libraries):
+    env.Append(JS_LIBS=env.File(libraries))
+
+
+def add_js_pre(env, js_pre):
+    env.Append(JS_PRE=env.File(js_pre))
+
+
+def add_js_externs(env, externs):
+    env.Append(JS_EXTERNS=env.File(externs))