Add sample-latex-math module
This commit is contained in:
Dimitry Ivanov
parent
fde9712454
commit
073f41b5f6
23
sample-latex-math/build.gradle
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23
sample-latex-math/build.gradle
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apply plugin: 'com.android.application'
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android {
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compileSdkVersion config['compile-sdk']
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buildToolsVersion config['build-tools']
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defaultConfig {
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applicationId "ru.noties.markwon.sample.jlatexmath"
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minSdkVersion config['min-sdk']
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targetSdkVersion config['target-sdk']
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versionCode 1
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versionName version
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}
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}
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dependencies {
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implementation project(':markwon')
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implementation project(':markwon-image-loader')
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implementation 'ru.noties:jlatexmath-android:0.1.0'
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}
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18
sample-latex-math/src/main/AndroidManifest.xml
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18
sample-latex-math/src/main/AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="ru.noties.markwon.sample.jlatexmath">
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<application
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android:allowBackup="true"
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android:label="@string/app_name"
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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<activity android:name=".MainActivity">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>
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package ru.noties.markwon.sample.jlatexmath;
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import org.commonmark.node.CustomBlock;
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public class JLatexMathBlock extends CustomBlock {
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private String latex;
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public String latex() {
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return latex;
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}
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public void latex(String latex) {
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this.latex = latex;
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}
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}
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package ru.noties.markwon.sample.jlatexmath;
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import org.commonmark.node.Block;
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import org.commonmark.parser.block.AbstractBlockParser;
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import org.commonmark.parser.block.AbstractBlockParserFactory;
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import org.commonmark.parser.block.BlockContinue;
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import org.commonmark.parser.block.BlockStart;
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import org.commonmark.parser.block.MatchedBlockParser;
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import org.commonmark.parser.block.ParserState;
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public class JLatexMathBlockParser extends AbstractBlockParser {
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private final JLatexMathBlock block = new JLatexMathBlock();
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private final StringBuilder builder = new StringBuilder();
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private boolean isClosed;
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@Override
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public Block getBlock() {
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return block;
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}
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@Override
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public BlockContinue tryContinue(ParserState parserState) {
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if (isClosed) {
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return BlockContinue.finished();
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}
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return BlockContinue.atIndex(parserState.getIndex());
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}
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@Override
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public void addLine(CharSequence line) {
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if (builder.length() > 0) {
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builder.append('\n');
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}
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builder.append(line);
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final int length = builder.length();
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if (length > 1) {
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isClosed = '$' == builder.charAt(length - 1)
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&& '$' == builder.charAt(length - 2);
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if (isClosed) {
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builder.replace(length - 2, length, "");
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}
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}
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}
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@Override
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public void closeBlock() {
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block.latex(builder.toString());
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}
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public static class Factory extends AbstractBlockParserFactory {
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@Override
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public BlockStart tryStart(ParserState state, MatchedBlockParser matchedBlockParser) {
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final CharSequence line = state.getLine();
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final int length = line != null
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? line.length()
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: 0;
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if (length > 1) {
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if ('$' == line.charAt(0)
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&& '$' == line.charAt(1)) {
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return BlockStart.of(new JLatexMathBlockParser())
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.atIndex(state.getIndex() + 2);
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}
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}
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return BlockStart.none();
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}
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}
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}
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package ru.noties.markwon.sample.jlatexmath;
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import android.graphics.drawable.Drawable;
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import android.net.Uri;
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import android.support.annotation.NonNull;
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import android.support.annotation.Nullable;
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import android.util.Log;
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import java.io.ByteArrayInputStream;
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import java.io.InputStream;
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import java.io.UnsupportedEncodingException;
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import java.util.Scanner;
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import ru.noties.jlatexmath.JLatexMathDrawable;
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import ru.noties.markwon.il.ImageItem;
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import ru.noties.markwon.il.MediaDecoder;
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import ru.noties.markwon.il.SchemeHandler;
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public class JLatexMathMedia {
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public static class Config {
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protected final float textSize;
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protected Drawable background;
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@JLatexMathDrawable.Align
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protected int align = JLatexMathDrawable.ALIGN_CENTER;
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protected boolean fitCanvas = true;
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protected int padding;
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public Config(float textSize) {
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this.textSize = textSize;
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}
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}
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public static final String SCHEME = "jlatexmath";
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@NonNull
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public static String makeDestination(@NonNull String latex) {
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return SCHEME + "://" + latex;
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}
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private static final String CONTENT_TYPE = "text/jlatexmath";
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private final Config config;
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public JLatexMathMedia(@NonNull Config config) {
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this.config = config;
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}
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@NonNull
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public SchemeHandler schemeHandler() {
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return new SchemeHandlerImpl();
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}
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@NonNull
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public MediaDecoder mediaDecoder() {
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return new MediaDecoderImpl(config);
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}
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static class SchemeHandlerImpl extends SchemeHandler {
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@Nullable
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@Override
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public ImageItem handle(@NonNull String raw, @NonNull Uri uri) {
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Log.e("handle", raw);
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ImageItem item = null;
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try {
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final byte[] bytes = raw.substring(SCHEME.length()).getBytes("UTF-8");
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item = new ImageItem(
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CONTENT_TYPE,
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new ByteArrayInputStream(bytes),
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null
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);
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} catch (UnsupportedEncodingException e) {
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e.printStackTrace();
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}
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return item;
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}
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@Override
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public void cancel(@NonNull String raw) {
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// no op
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}
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}
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static class MediaDecoderImpl extends MediaDecoder {
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private final Config config;
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MediaDecoderImpl(@NonNull Config config) {
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this.config = config;
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}
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@Override
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public boolean canDecodeByContentType(@Nullable String contentType) {
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return CONTENT_TYPE.equals(contentType);
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}
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@Override
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public boolean canDecodeByFileName(@NonNull String fileName) {
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return false;
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}
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@Nullable
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@Override
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public Drawable decode(@NonNull InputStream inputStream) {
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final Scanner scanner = new Scanner(inputStream, "UTF-8").useDelimiter("\\A");
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final String latex = scanner.hasNext()
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? scanner.next()
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: null;
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Log.e("decode", latex);
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if (latex == null) {
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return null;
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}
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// todo: change to float
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return JLatexMathDrawable.builder(latex)
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.textSize((int) config.textSize)
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.background(config.background)
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.align(config.align)
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.fitCanvas(config.fitCanvas)
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.padding(config.padding)
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.build();
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}
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}
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}
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@ -0,0 +1,113 @@
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package ru.noties.markwon.sample.jlatexmath;
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import android.app.Activity;
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import android.os.Bundle;
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import android.util.Log;
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import android.widget.TextView;
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import org.commonmark.node.CustomBlock;
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import org.commonmark.node.Node;
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import org.commonmark.parser.Parser;
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import ru.noties.jlatexmath.JLatexMathAndroid;
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import ru.noties.jlatexmath.JLatexMathDrawable;
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import ru.noties.markwon.Markwon;
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import ru.noties.markwon.SpannableBuilder;
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import ru.noties.markwon.SpannableConfiguration;
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import ru.noties.markwon.il.AsyncDrawableLoader;
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import ru.noties.markwon.renderer.ImageSize;
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import ru.noties.markwon.renderer.SpannableMarkdownVisitor;
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public class MainActivity extends Activity {
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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// todo: later version has automatic initialization
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JLatexMathAndroid.init(this);
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final TextView textView = findViewById(R.id.text_view);
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// this one fails due input sanitizing on commonmark-java side
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String latex = "\\begin{array}{l}";
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latex += "\\forall\\varepsilon\\in\\mathbb{R}_+^*\\ \\exists\\eta>0\\ |x-x_0|\\leq\\eta\\Longrightarrow|f(x)-f(x_0)|\\leq\\varepsilon\\\\";
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latex += "\\det\\begin{bmatrix}a_{11}&a_{12}&\\cdots&a_{1n}\\\\a_{21}&\\ddots&&\\vdots\\\\\\vdots&&\\ddots&\\vdots\\\\a_{n1}&\\cdots&\\cdots&a_{nn}\\end{bmatrix}\\overset{\\mathrm{def}}{=}\\sum_{\\sigma\\in\\mathfrak{S}_n}\\varepsilon(\\sigma)\\prod_{k=1}^n a_{k\\sigma(k)}\\\\";
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latex += "\\sideset{_\\alpha^\\beta}{_\\gamma^\\delta}{\\begin{pmatrix}a&b\\\\c&d\\end{pmatrix}}\\\\";
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latex += "\\int_0^\\infty{x^{2n} e^{-a x^2}\\,dx} = \\frac{2n-1}{2a} \\int_0^\\infty{x^{2(n-1)} e^{-a x^2}\\,dx} = \\frac{(2n-1)!!}{2^{n+1}} \\sqrt{\\frac{\\pi}{a^{2n+1}}}\\\\";
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latex += "\\int_a^b{f(x)\\,dx} = (b - a) \\sum\\limits_{n = 1}^\\infty {\\sum\\limits_{m = 1}^{2^n - 1} {\\left( { - 1} \\right)^{m + 1} } } 2^{ - n} f(a + m\\left( {b - a} \\right)2^{-n} )\\\\";
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latex += "\\int_{-\\pi}^{\\pi} \\sin(\\alpha x) \\sin^n(\\beta x) dx = \\textstyle{\\left \\{ \\begin{array}{cc} (-1)^{(n+1)/2} (-1)^m \\frac{2 \\pi}{2^n} \\binom{n}{m} & n \\mbox{ odd},\\ \\alpha = \\beta (2m-n) \\\\ 0 & \\mbox{otherwise} \\\\ \\end{array} \\right .}\\\\";
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latex += "L = \\int_a^b \\sqrt{ \\left|\\sum_{i,j=1}^ng_{ij}(\\gamma(t))\\left(\\frac{d}{dt}x^i\\circ\\gamma(t)\\right)\\left(\\frac{d}{dt}x^j\\circ\\gamma(t)\\right)\\right|}\\,dt\\\\";
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latex += "\\begin{array}{rl} s &= \\int_a^b\\left\\|\\frac{d}{dt}\\vec{r}\\,(u(t),v(t))\\right\\|\\,dt \\\\ &= \\int_a^b \\sqrt{u'(t)^2\\,\\vec{r}_u\\cdot\\vec{r}_u + 2u'(t)v'(t)\\, \\vec{r}_u\\cdot\\vec{r}_v+ v'(t)^2\\,\\vec{r}_v\\cdot\\vec{r}_v}\\,\\,\\, dt. \\end{array}\\\\";
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latex += "\\end{array}";
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// String latex = "\\text{A long division \\longdiv{12345}{13}";
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// String latex = "{a \\bangle b} {c \\brace d} {e \\brack f} {g \\choose h}";
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// String latex = "\\begin{array}{cc}";
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// latex += "\\fbox{\\text{A framed box with \\textdbend}}&\\shadowbox{\\text{A shadowed box}}\\cr";
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// latex += "\\doublebox{\\text{A double framed box}}&\\ovalbox{\\text{An oval framed box}}\\cr";
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// latex += "\\end{array}";
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// mention another way of doing this: through async drawable to process formulas in background
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final JLatexMathMedia.Config config = new JLatexMathMedia.Config(textView.getTextSize()) {{
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// align = JLatexMathDrawable.ALIGN_RIGHT;
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}};
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final JLatexMathMedia jLatexMathMedia = new JLatexMathMedia(config);
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final AsyncDrawableLoader asyncDrawableLoader = AsyncDrawableLoader.builder()
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.schemeHandler(JLatexMathMedia.SCHEME, jLatexMathMedia.schemeHandler())
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.mediaDecoders(jLatexMathMedia.mediaDecoder())
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.build();
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final SpannableConfiguration configuration = SpannableConfiguration.builder(this)
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.asyncDrawableLoader(asyncDrawableLoader)
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.build();
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final String markdown = "# Example of LaTeX\n\n$$"
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+ latex + "$$\n\n something like **this**";
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final Parser parser = new Parser.Builder()
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.customBlockParserFactory(new JLatexMathBlockParser.Factory())
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.build();
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final Node node = parser.parse(markdown);
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final SpannableBuilder builder = new SpannableBuilder();
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final SpannableMarkdownVisitor visitor = new SpannableMarkdownVisitor(SpannableConfiguration.create(this), builder) {
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@Override
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public void visit(CustomBlock customBlock) {
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if (!(customBlock instanceof JLatexMathBlock)) {
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super.visit(customBlock);
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return;
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}
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final String latex = ((JLatexMathBlock) customBlock).latex();
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final int length = builder.length();
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builder.append(latex);
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SpannableBuilder.setSpans(
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builder,
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configuration.factory().image(
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configuration.theme(),
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JLatexMathMedia.makeDestination(latex),
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configuration.asyncDrawableLoader(),
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configuration.imageSizeResolver(),
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new ImageSize(new ImageSize.Dimension(100, "%"), null),
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false
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),
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length,
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builder.length()
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);
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}
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};
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node.accept(visitor);
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Markwon.setText(textView, builder.text());
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}
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}
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14
sample-latex-math/src/main/res/layout/activity_main.xml
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14
sample-latex-math/src/main/res/layout/activity_main.xml
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<?xml version="1.0" encoding="utf-8"?>
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<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:clipChildren="false"
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android:clipToPadding="false">
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<TextView
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android:id="@+id/text_view"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:padding="16dip" />
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</ScrollView>
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3
sample-latex-math/src/main/res/values/strings.xml
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3
sample-latex-math/src/main/res/values/strings.xml
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<resources>
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<string name="app_name">Markwon-JLatexMath</string>
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</resources>
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6
sample-latex-math/src/main/res/values/styles.xml
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6
sample-latex-math/src/main/res/values/styles.xml
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<resources>
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<style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">
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</style>
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</resources>
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@ -1,3 +1,3 @@
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rootProject.name = 'MarkwonProject'
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include ':app', ':markwon', ':markwon-image-loader', ':markwon-view', ':sample-custom-extension',
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include ':app', ':markwon', ':markwon-image-loader', ':markwon-view', ':sample-custom-extension', ':sample-latex-math',
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':markwon-syntax-highlight', ':markwon-html-parser-api', ':markwon-html-parser-impl'
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