net.codemirror.mode.ModeInjector.java Source code

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Here is the source code for net.codemirror.mode.ModeInjector.java

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// 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(final 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);
        }
    }
}