Add module

build.gradle

@@ -10,6 +10,9 @@ buildscript {
 
 allprojects {
     repositories {
+        if (project.hasProperty('LOCAL_MAVEN_URL')) {
+            maven { url LOCAL_MAVEN_URL }
+        }
         jcenter()
         google()
     }
@@ -46,4 +49,7 @@ ext {
     ANDROID_SVG = 'com.caverock:androidsvg:1.2.1'
     ANDROID_GIF = 'pl.droidsonroids.gif:android-gif-drawable:1.2.14'
     OK_HTTP = 'com.squareup.okhttp3:okhttp:3.9.0'
+
+    PRISM_4J = 'ru.noties:prism4j:1.0.0'
+    PRISM_4J_BUNDLER = 'ru.noties:prism4j-bundler:1.0.0'
 }

library-syntax/build.gradle

@@ -0,0 +1,24 @@
+apply plugin: 'com.android.library'
+
+android {
+
+    compileSdkVersion TARGET_SDK
+    buildToolsVersion BUILD_TOOLS
+
+    defaultConfig {
+        minSdkVersion MIN_SDK
+        targetSdkVersion TARGET_SDK
+        versionCode 1
+        versionName version
+    }
+}
+
+dependencies {
+    api SUPPORT_ANNOTATIONS
+    api PRISM_4J
+    api project(':library')
+}
+
+afterEvaluate {
+    generateReleaseBuildConfig.enabled = false
+}

library-syntax/src/main/AndroidManifest.xml

@@ -0,0 +1 @@
+<manifest package="ru.noties.markwon.syntax" />

library-syntax/src/main/java/ru/noties/markwon/syntax/Prism4jSyntaxHighlight.java

@@ -0,0 +1,105 @@
+package ru.noties.markwon.syntax;
+
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.text.TextUtils;
+
+import ru.noties.markwon.SpannableBuilder;
+import ru.noties.markwon.SyntaxHighlight;
+import ru.noties.prism4j.Prism4j;
+
+public class Prism4jSyntaxHighlight implements SyntaxHighlight {
+
+    @NonNull
+    public static Prism4jSyntaxHighlight create(
+            @NonNull Prism4j prism4j,
+            @NonNull Prism4jTheme theme) {
+        return null;
+    }
+
+    @NonNull
+    public static Prism4jSyntaxHighlight create(
+            @NonNull Prism4j prism4j,
+            @NonNull Prism4jTheme theme,
+            @Nullable String fallback) {
+        return null;
+    }
+
+    private final Prism4j prism4j;
+    private final Prism4jTheme theme;
+    private final String fallback;
+
+    protected Prism4jSyntaxHighlight(
+            @NonNull Prism4j prism4j,
+            @NonNull Prism4jTheme theme,
+            @Nullable String fallback) {
+        this.prism4j = prism4j;
+        this.theme = theme;
+        this.fallback = fallback;
+    }
+
+    @NonNull
+    @Override
+    public CharSequence highlight(@Nullable String info, @NonNull String code) {
+        // if info is null, do not highlight -> LICENCE footer very commonly wrapped inside code
+        // block without syntax name specified (so, do not highlight)
+        return info == null
+                ? highlightNoLanguageInfo(code)
+                : highlightWithLanguageInfo(info, code);
+    }
+
+    @NonNull
+    protected CharSequence highlightNoLanguageInfo(@NonNull String code) {
+        return code;
+    }
+
+    @NonNull
+    protected CharSequence highlightWithLanguageInfo(@NonNull String info, @NonNull String code) {
+
+        final CharSequence out;
+
+        final String language;
+        final Prism4j.Grammar grammar;
+        {
+            String _language = info;
+            Prism4j.Grammar _grammar = prism4j.grammar(info);
+            if (_grammar == null && !TextUtils.isEmpty(fallback)) {
+                _language = fallback;
+                _grammar = prism4j.grammar(fallback);
+            }
+            language = _language;
+            grammar = _grammar;
+        }
+
+        if (grammar != null) {
+            out = highlight(language, grammar, code);
+        } else {
+            out = code;
+        }
+
+        return out;
+    }
+
+    @NonNull
+    protected CharSequence highlight(@NonNull String language, @NonNull Prism4j.Grammar grammar, @NonNull String code) {
+        final SpannableBuilder builder = new SpannableBuilder();
+        final Prism4jSyntaxVisitor visitor = new Prism4jSyntaxVisitor(language, theme, builder);
+        visitor.visit(prism4j.tokenize(code, grammar));
+        return builder.text();
+    }
+
+    @NonNull
+    protected Prism4j prism4j() {
+        return prism4j;
+    }
+
+    @NonNull
+    protected Prism4jTheme theme() {
+        return theme;
+    }
+
+    @Nullable
+    protected String fallback() {
+        return fallback;
+    }
+}

library-syntax/src/main/java/ru/noties/markwon/syntax/Prism4jSyntaxVisitor.java

@@ -0,0 +1,40 @@
+package ru.noties.markwon.syntax;
+
+import android.support.annotation.NonNull;
+
+import ru.noties.markwon.SpannableBuilder;
+import ru.noties.prism4j.AbsVisitor;
+import ru.noties.prism4j.Prism4j;
+
+class Prism4jSyntaxVisitor extends AbsVisitor {
+
+    private final String language;
+    private final Prism4jTheme theme;
+    private final SpannableBuilder builder;
+
+    Prism4jSyntaxVisitor(
+            @NonNull String language,
+            @NonNull Prism4jTheme theme,
+            @NonNull SpannableBuilder builder) {
+        this.language = language;
+        this.theme = theme;
+        this.builder = builder;
+    }
+
+    @Override
+    protected void visitText(@NonNull Prism4j.Text text) {
+        builder.append(text.literal());
+    }
+
+    @Override
+    protected void visitSyntax(@NonNull Prism4j.Syntax syntax) {
+
+        final int start = builder.length();
+        visit(syntax.children());
+        final int end = builder.length();
+
+        if (end != start) {
+            theme.apply(language, syntax, builder, start, end);
+        }
+    }
+}

library-syntax/src/main/java/ru/noties/markwon/syntax/Prism4jTheme.java

@@ -0,0 +1,17 @@
+package ru.noties.markwon.syntax;
+
+import android.support.annotation.NonNull;
+
+import ru.noties.markwon.SpannableBuilder;
+import ru.noties.prism4j.Prism4j;
+
+public interface Prism4jTheme {
+
+    void apply(
+            @NonNull String language,
+            @NonNull Prism4j.Syntax syntax,
+            @NonNull SpannableBuilder builder,
+            int start,
+            int end
+    );
+}

settings.gradle

@@ -1 +1 @@
-include ':app', ':library', ':library-image-loader', ':library-view', ':sample-custom-extension'
+include ':app', ':library', ':library-image-loader', ':library-view', ':sample-custom-extension', ':library-syntax'