| /* |
| * 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.util.Xml; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| 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 { |
| |
| public static class Config { |
| Config() { |
| families = new ArrayList<Family>(); |
| aliases = new ArrayList<Alias>(); |
| } |
| public List<Family> families; |
| public List<Alias> aliases; |
| } |
| |
| public static class Axis { |
| Axis(int tag, float styleValue) { |
| this.tag = tag; |
| this.styleValue = styleValue; |
| } |
| public final int tag; |
| public final float styleValue; |
| } |
| |
| public static class Font { |
| Font(String fontName, int ttcIndex, List<Axis> axes, int weight, boolean isItalic) { |
| this.fontName = fontName; |
| this.ttcIndex = ttcIndex; |
| this.axes = axes; |
| this.weight = weight; |
| this.isItalic = isItalic; |
| } |
| public String fontName; |
| public int ttcIndex; |
| public final List<Axis> axes; |
| public int weight; |
| public boolean isItalic; |
| } |
| |
| public static class Alias { |
| public String name; |
| public String toName; |
| public int weight; |
| } |
| |
| public static class Family { |
| public Family(String name, List<Font> fonts, String lang, String variant) { |
| this.name = name; |
| this.fonts = fonts; |
| this.lang = lang; |
| this.variant = variant; |
| } |
| |
| public String name; |
| public List<Font> fonts; |
| public String lang; |
| public String variant; |
| } |
| |
| /* Parse fallback list (no names) */ |
| public static Config parse(InputStream in) throws XmlPullParserException, IOException { |
| try { |
| XmlPullParser parser = Xml.newPullParser(); |
| parser.setInput(in, null); |
| parser.nextTag(); |
| return readFamilies(parser); |
| } finally { |
| in.close(); |
| } |
| } |
| |
| // Note that a well-formed variation contains a four-character tag and a float as styleValue, |
| // with spacers in between. The tag is enclosd either by double quotes or single quotes. |
| @VisibleForTesting |
| public static Axis[] parseFontVariationSettings(String settings) { |
| String[] settingList = settings.split(","); |
| ArrayList<Axis> axisList = new ArrayList<>(); |
| settingLoop: |
| for (String setting : settingList) { |
| int pos = 0; |
| while (pos < setting.length()) { |
| char c = setting.charAt(pos); |
| if (c == '\'' || c == '"') { |
| break; |
| } else if (!isSpacer(c)) { |
| continue settingLoop; // Only spacers are allowed before tag appeared. |
| } |
| pos++; |
| } |
| if (pos + 7 > setting.length()) { |
| continue; // 7 is the minimum length of tag-style value pair text. |
| } |
| if (setting.charAt(pos) != setting.charAt(pos + 5)) { |
| continue; // Tag should be wrapped with double or single quote. |
| } |
| String tagString = setting.substring(pos + 1, pos + 5); |
| if (!TAG_PATTERN.matcher(tagString).matches()) { |
| continue; // Skip incorrect format tag. |
| } |
| pos += 6; |
| while (pos < setting.length()) { |
| if (!isSpacer(setting.charAt(pos++))) { |
| break; // Skip spacers between the tag and the styleValue. |
| } |
| } |
| // Skip invalid styleValue |
| float styleValue; |
| String valueString = setting.substring(pos - 1); |
| if (!STYLE_VALUE_PATTERN.matcher(valueString).matches()) { |
| continue; // Skip incorrect format styleValue. |
| } |
| try { |
| styleValue = Float.parseFloat(valueString); |
| } catch (NumberFormatException e) { |
| continue; // ignoreing invalid number format |
| } |
| int tag = makeTag(tagString.charAt(0), tagString.charAt(1), tagString.charAt(2), |
| tagString.charAt(3)); |
| axisList.add(new Axis(tag, styleValue)); |
| } |
| return axisList.toArray(new Axis[axisList.size()]); |
| } |
| |
| @VisibleForTesting |
| public static int makeTag(char c1, char c2, char c3, char c4) { |
| return (c1 << 24) | (c2 << 16) | (c3 << 8) | c4; |
| } |
| |
| private static boolean isSpacer(char c) { |
| return c == ' ' || c == '\r' || c == '\t' || c == '\n'; |
| } |
| |
| private static Config readFamilies(XmlPullParser parser) |
| throws XmlPullParserException, IOException { |
| Config config = new Config(); |
| 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")) { |
| config.families.add(readFamily(parser)); |
| } else if (tag.equals("alias")) { |
| config.aliases.add(readAlias(parser)); |
| } else { |
| skip(parser); |
| } |
| } |
| return config; |
| } |
| |
| private static 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<Font> fonts = new ArrayList<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); |
| } |
| } |
| return new 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 Font readFont(XmlPullParser parser) |
| throws XmlPullParserException, IOException { |
| String indexStr = parser.getAttributeValue(null, "index"); |
| int index = indexStr == null ? 0 : Integer.parseInt(indexStr); |
| List<Axis> axes = new ArrayList<Axis>(); |
| 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 fullFilename = "/system/fonts/" + |
| FILENAME_WHITESPACE_PATTERN.matcher(filename).replaceAll(""); |
| return new Font(fullFilename, index, axes, weight, isItalic); |
| } |
| |
| /** The 'tag' attribute value is read as four character values between U+0020 and U+007E |
| * inclusive. |
| */ |
| private static final Pattern TAG_PATTERN = Pattern.compile("[\\x20-\\x7E]{4}"); |
| |
| /** The 'styleValue' attribute has an optional leading '-', followed by '<digits>', |
| * '<digits>.<digits>', or '.<digits>' where '<digits>' is one or more of [0-9]. |
| */ |
| private static final Pattern STYLE_VALUE_PATTERN = |
| Pattern.compile("-?(([0-9]+(\\.[0-9]+)?)|(\\.[0-9]+))"); |
| |
| private static Axis readAxis(XmlPullParser parser) |
| throws XmlPullParserException, IOException { |
| int tag = 0; |
| String tagStr = parser.getAttributeValue(null, "tag"); |
| if (tagStr != null && TAG_PATTERN.matcher(tagStr).matches()) { |
| tag = makeTag(tagStr.charAt(0), tagStr.charAt(1), tagStr.charAt(2), tagStr.charAt(3)); |
| } else { |
| throw new XmlPullParserException("Invalid tag attribute value.", parser, null); |
| } |
| |
| float styleValue = 0; |
| String styleValueStr = parser.getAttributeValue(null, "stylevalue"); |
| if (styleValueStr != null && STYLE_VALUE_PATTERN.matcher(styleValueStr).matches()) { |
| styleValue = Float.parseFloat(styleValueStr); |
| } else { |
| throw new XmlPullParserException("Invalid styleValue attribute value.", parser, null); |
| } |
| |
| skip(parser); // axis tag is empty, ignore any contents and consume end tag |
| return new Axis(tag, styleValue); |
| } |
| |
| private static Alias readAlias(XmlPullParser parser) |
| throws XmlPullParserException, IOException { |
| Alias alias = new Alias(); |
| alias.name = parser.getAttributeValue(null, "name"); |
| alias.toName = parser.getAttributeValue(null, "to"); |
| String weightStr = parser.getAttributeValue(null, "weight"); |
| if (weightStr == null) { |
| alias.weight = 400; |
| } else { |
| alias.weight = Integer.parseInt(weightStr); |
| } |
| skip(parser); // alias tag is empty, ignore any contents and consume end tag |
| return alias; |
| } |
| |
| 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; |
| } |
| } |
| } |
| } |