blob: 5fda6082f77051f87247c14ab3c4b5b524c5a0eb [file] [log] [blame]
// Copyright (C) 2013 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package net.codemirror.mode;
import com.google.gwt.core.client.JsArrayString;
import com.google.gwt.user.client.rpc.AsyncCallback;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import net.codemirror.lib.Loader;
public class ModeInjector {
private static boolean canLoad(String mode) {
return ModeInfo.getModeScriptUri(mode) != null;
}
private static native boolean isModeLoaded(String n)
/*-{ return $wnd.CodeMirror.modes.hasOwnProperty(n); }-*/ ;
private static native boolean isMimeLoaded(String n)
/*-{ return $wnd.CodeMirror.mimeModes.hasOwnProperty(n); }-*/ ;
private static native JsArrayString getDependencies(String n)
/*-{ return $wnd.CodeMirror.modes[n].dependencies || []; }-*/ ;
private final Set<String> loading = new HashSet<>(4);
private int pending;
private AsyncCallback<Void> appCallback;
public ModeInjector add(String name) {
if (name == null || isModeLoaded(name) || isMimeLoaded(name)) {
return this;
}
ModeInfo m = ModeInfo.findModeByMIME(name);
if (m != null) {
name = m.mode();
}
if (!canLoad(name)) {
Logger.getLogger("net.codemirror")
.log(Level.WARNING, "CodeMirror mode " + name + " not configured.");
return this;
}
loading.add(name);
return this;
}
public void inject(AsyncCallback<Void> appCallback) {
this.appCallback = appCallback;
for (String mode : loading) {
beginLoading(mode);
}
if (pending == 0) {
appCallback.onSuccess(null);
}
}
private void beginLoading(String mode) {
pending++;
Loader.injectScript(
ModeInfo.getModeScriptUri(mode),
new AsyncCallback<Void>() {
@Override
public void onSuccess(Void result) {
pending--;
ensureDependenciesAreLoaded(mode);
if (pending == 0) {
appCallback.onSuccess(null);
}
}
@Override
public void onFailure(Throwable caught) {
if (--pending == 0) {
appCallback.onFailure(caught);
}
}
});
}
private void ensureDependenciesAreLoaded(String mode) {
JsArrayString deps = getDependencies(mode);
for (int i = 0; i < deps.length(); i++) {
String d = deps.get(i);
if (loading.contains(d) || isModeLoaded(d)) {
continue;
}
if (!canLoad(d)) {
Logger.getLogger("net.codemirror")
.log(Level.SEVERE, "CodeMirror mode " + d + " needs " + d);
continue;
}
loading.add(d);
beginLoading(d);
}
}
}