Merge "Delete accidentally submitted FontResourcesParser"

/*

 * Copyright (C) 2017 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 android.graphics;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlPullParserException;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import java.util.regex.Pattern;

/**

 * Parser for xml type font resources.

 * @hide

 */

public class FontResourcesParser {

    private static final String ANDROID_NAMESPACE = "http://schemas.android.com/apk/res/android";

    /* Parse fallback list (no names) */

    public static FontListParser.Config parse(XmlPullParser parser)

            throws XmlPullParserException, IOException {

        int type;

        //noinspection StatementWithEmptyBody

        while ((type=parser.next()) != XmlPullParser.START_TAG

                && type != XmlPullParser.END_DOCUMENT) {

            // Empty loop.

        }

        if (type != XmlPullParser.START_TAG) {

            throw new XmlPullParserException("No start tag found");

        }

        return readFamilies(parser);

    }

    private static FontListParser.Config readFamilies(XmlPullParser parser)

            throws XmlPullParserException, IOException {

        FontListParser.Config config = new FontListParser.Config();

        parser.require(XmlPullParser.START_TAG, null, "font-family");

        String tag = parser.getName();

        if (tag.equals("font-family")) {

            config.families.add(readFamily(parser));

        } else {

            skip(parser);

        }

        return config;

    }

    private static FontListParser.Family readFamily(XmlPullParser parser)

            throws XmlPullParserException, IOException {

        String name = parser.getAttributeValue(null, "name");

        String lang = parser.getAttributeValue(null, "lang");

        String variant = parser.getAttributeValue(null, "variant");

        List<FontListParser.Font> fonts = new ArrayList<>();

        while (parser.next() != XmlPullParser.END_TAG) {

            if (parser.getEventType() != XmlPullParser.START_TAG) continue;

            String tag = parser.getName();

            if (tag.equals("font")) {

                fonts.add(readFont(parser));

            } else {

                skip(parser);

            }

        }

        return new FontListParser.Family(name, fonts, lang, variant);

    }

    /** Matches leading and trailing XML whitespace. */

    private static final Pattern FILENAME_WHITESPACE_PATTERN =

            Pattern.compile("^[ \\n\\r\\t]+|[ \\n\\r\\t]+$");

    private static FontListParser.Font readFont(XmlPullParser parser)

            throws XmlPullParserException, IOException {

        List<FontListParser.Axis> axes = new ArrayList<>();

        String weightStr = parser.getAttributeValue(ANDROID_NAMESPACE, "fontWeight");

        int weight = weightStr == null ? 400 : Integer.parseInt(weightStr);

        boolean isItalic = "italic".equals(

                parser.getAttributeValue(ANDROID_NAMESPACE, "fontStyle"));

        String filename = parser.getAttributeValue(ANDROID_NAMESPACE, "font");

        String fullFilename = FILENAME_WHITESPACE_PATTERN.matcher(filename).replaceAll("");

        return new FontListParser.Font(fullFilename, 0, axes, weight, isItalic);

    }

    private static void skip(XmlPullParser parser) throws XmlPullParserException, IOException {

        int depth = 1;

        while (depth > 0) {

            switch (parser.next()) {

                case XmlPullParser.START_TAG:

                    depth++;

                    break;

                case XmlPullParser.END_TAG:

                    depth--;

                    break;

            }

        }

    }

}