| /* |
| * Copyright (C) 2014 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 android.text.FontConfig; |
| import android.graphics.fonts.FontVariationAxis; |
| import android.util.Xml; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import android.annotation.Nullable; |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.regex.Pattern; |
| |
| /** |
| * Parser for font config files. |
| * |
| * @hide |
| */ |
| public class FontListParser { |
| |
| /* Parse fallback list (no names) */ |
| public static FontConfig parse(InputStream in) throws XmlPullParserException, IOException { |
| try { |
| XmlPullParser parser = Xml.newPullParser(); |
| parser.setInput(in, null); |
| parser.nextTag(); |
| return readFamilies(parser); |
| } finally { |
| in.close(); |
| } |
| } |
| |
| private static FontConfig readFamilies(XmlPullParser parser) |
| throws XmlPullParserException, IOException { |
| List<FontConfig.Family> families = new ArrayList<>(); |
| List<FontConfig.Alias> aliases = new ArrayList<>(); |
| |
| parser.require(XmlPullParser.START_TAG, null, "familyset"); |
| while (parser.next() != XmlPullParser.END_TAG) { |
| if (parser.getEventType() != XmlPullParser.START_TAG) continue; |
| String tag = parser.getName(); |
| if (tag.equals("family")) { |
| families.add(readFamily(parser)); |
| } else if (tag.equals("alias")) { |
| aliases.add(readAlias(parser)); |
| } else { |
| skip(parser); |
| } |
| } |
| return new FontConfig(families.toArray(new FontConfig.Family[families.size()]), |
| aliases.toArray(new FontConfig.Alias[aliases.size()])); |
| } |
| |
| private static FontConfig.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<FontConfig.Font> fonts = new ArrayList<FontConfig.Font>(); |
| 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); |
| } |
| } |
| int intVariant = FontConfig.Family.VARIANT_DEFAULT; |
| if (variant != null) { |
| if (variant.equals("compact")) { |
| intVariant = FontConfig.Family.VARIANT_COMPACT; |
| } else if (variant.equals("elegant")) { |
| intVariant = FontConfig.Family.VARIANT_ELEGANT; |
| } |
| } |
| return new FontConfig.Family(name, fonts.toArray(new FontConfig.Font[fonts.size()]), lang, |
| intVariant); |
| } |
| |
| /** Matches leading and trailing XML whitespace. */ |
| private static final Pattern FILENAME_WHITESPACE_PATTERN = |
| Pattern.compile("^[ \\n\\r\\t]+|[ \\n\\r\\t]+$"); |
| |
| private static FontConfig.Font readFont(XmlPullParser parser) |
| throws XmlPullParserException, IOException { |
| String indexStr = parser.getAttributeValue(null, "index"); |
| int index = indexStr == null ? 0 : Integer.parseInt(indexStr); |
| List<FontVariationAxis> axes = new ArrayList<FontVariationAxis>(); |
| String weightStr = parser.getAttributeValue(null, "weight"); |
| int weight = weightStr == null ? 400 : Integer.parseInt(weightStr); |
| boolean isItalic = "italic".equals(parser.getAttributeValue(null, "style")); |
| StringBuilder filename = new StringBuilder(); |
| while (parser.next() != XmlPullParser.END_TAG) { |
| if (parser.getEventType() == XmlPullParser.TEXT) { |
| filename.append(parser.getText()); |
| } |
| if (parser.getEventType() != XmlPullParser.START_TAG) continue; |
| String tag = parser.getName(); |
| if (tag.equals("axis")) { |
| axes.add(readAxis(parser)); |
| } else { |
| skip(parser); |
| } |
| } |
| String sanitizedName = FILENAME_WHITESPACE_PATTERN.matcher(filename).replaceAll(""); |
| return new FontConfig.Font(sanitizedName, index, |
| axes.toArray(new FontVariationAxis[axes.size()]), weight, isItalic); |
| } |
| |
| private static FontVariationAxis readAxis(XmlPullParser parser) |
| throws XmlPullParserException, IOException { |
| String tagStr = parser.getAttributeValue(null, "tag"); |
| String styleValueStr = parser.getAttributeValue(null, "stylevalue"); |
| skip(parser); // axis tag is empty, ignore any contents and consume end tag |
| return new FontVariationAxis(tagStr, Float.parseFloat(styleValueStr)); |
| } |
| |
| private static FontConfig.Alias readAlias(XmlPullParser parser) |
| throws XmlPullParserException, IOException { |
| String name = parser.getAttributeValue(null, "name"); |
| String toName = parser.getAttributeValue(null, "to"); |
| String weightStr = parser.getAttributeValue(null, "weight"); |
| int weight; |
| if (weightStr == null) { |
| weight = 400; |
| } else { |
| weight = Integer.parseInt(weightStr); |
| } |
| skip(parser); // alias tag is empty, ignore any contents and consume end tag |
| return new FontConfig.Alias(name, toName, weight); |
| } |
| |
| 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; |
| } |
| } |
| } |
| } |