From debb3e04dfb7399e820371145fced99641416fc1 Mon Sep 17 00:00:00 2001
From: Balazs Toldi <balazs@toldi.eu>
Date: Sun, 30 Jul 2023 11:02:11 +0200
Subject: [PATCH] Parse comments to replace empty image captions

Closes #33
---
 .../comment/ParseComment.java                 |  6 ++-
 .../markdown/MarkdownUtils.java               | 42 ++++++++++++++++++-
 .../infinityforlemmy/post/ParsePost.java      |  9 ++--
 3 files changed, 49 insertions(+), 8 deletions(-)

diff --git a/app/src/main/java/eu/toldi/infinityforlemmy/comment/ParseComment.java b/app/src/main/java/eu/toldi/infinityforlemmy/comment/ParseComment.java
index ad343859..f99a0842 100644
--- a/app/src/main/java/eu/toldi/infinityforlemmy/comment/ParseComment.java
+++ b/app/src/main/java/eu/toldi/infinityforlemmy/comment/ParseComment.java
@@ -21,6 +21,7 @@ import java.util.TimeZone;
 import java.util.concurrent.Executor;
 import java.util.regex.Pattern;
 
+import eu.toldi.infinityforlemmy.markdown.MarkdownUtils;
 import eu.toldi.infinityforlemmy.utils.JSONUtils;
 import eu.toldi.infinityforlemmy.utils.LemmyUtils;
 
@@ -296,8 +297,9 @@ public class ParseComment {
         } catch (ParseException e) {
             e.printStackTrace();
         }
-        String commentMarkdown = commentObj.getString("content");
-        String commentRawText = commentObj.getString("content");
+        String content = MarkdownUtils.processImageCaptions(commentObj.getString("content"), "Image");
+        String commentMarkdown = content;
+        String commentRawText = content;
         String linkId = postObj.getString("id");
         String communityName = communityObj.getString("name");
         String communityQualifiedName = LemmyUtils.actorID2FullName(communityObj.getString("actor_id"));
diff --git a/app/src/main/java/eu/toldi/infinityforlemmy/markdown/MarkdownUtils.java b/app/src/main/java/eu/toldi/infinityforlemmy/markdown/MarkdownUtils.java
index 75ce3ba6..8e573fe3 100644
--- a/app/src/main/java/eu/toldi/infinityforlemmy/markdown/MarkdownUtils.java
+++ b/app/src/main/java/eu/toldi/infinityforlemmy/markdown/MarkdownUtils.java
@@ -8,6 +8,11 @@ import androidx.annotation.Nullable;
 
 import org.commonmark.ext.gfm.tables.TableBlock;
 
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import eu.toldi.infinityforlemmy.R;
+import eu.toldi.infinityforlemmy.customviews.CustomMarkwonAdapter;
 import io.noties.markwon.Markwon;
 import io.noties.markwon.MarkwonPlugin;
 import io.noties.markwon.ext.strikethrough.StrikethroughPlugin;
@@ -20,8 +25,6 @@ import io.noties.markwon.recycler.MarkwonAdapter;
 import io.noties.markwon.recycler.table.TableEntry;
 import io.noties.markwon.recycler.table.TableEntryPlugin;
 import me.saket.bettermovementmethod.BetterLinkMovementMethod;
-import eu.toldi.infinityforlemmy.R;
-import eu.toldi.infinityforlemmy.customviews.CustomMarkwonAdapter;
 
 public class MarkdownUtils {
     /**
@@ -112,4 +115,39 @@ public class MarkdownUtils {
                         .textLayoutIsRoot(R.layout.view_table_entry_cell)))
                 .build();
     }
+
+    private static final Pattern emptyPattern = Pattern.compile("!\\[\\]\\((.*?)\\)");
+    private static final Pattern nonEmptyPattern = Pattern.compile("!\\[(.*?)\\]\\((.*?)\\)");
+
+    public static String processImageCaptions(String markdown, String replacementCaption) {
+        // Pattern for Markdown images with empty captions
+
+        // Pattern for Markdown images with non-empty captions
+
+
+        Matcher emptyMatcher = emptyPattern.matcher(markdown);
+        StringBuffer sb = new StringBuffer();
+
+        while (emptyMatcher.find()) {
+            // Replace the matched pattern with the same URL, but with a caption
+            emptyMatcher.appendReplacement(sb, "[" + replacementCaption + "](" + emptyMatcher.group(1) + ")");
+        }
+
+        // Append the rest of the content
+        emptyMatcher.appendTail(sb);
+
+        // Now process non-empty captions
+        Matcher nonEmptyMatcher = nonEmptyPattern.matcher(sb.toString());
+        StringBuffer finalSb = new StringBuffer();
+
+        while (nonEmptyMatcher.find()) {
+            // Replace the matched pattern with the same URL and caption, but without the "!"
+            nonEmptyMatcher.appendReplacement(finalSb, "[" + nonEmptyMatcher.group(1) + "](" + nonEmptyMatcher.group(2) + ")");
+        }
+
+        // Append the rest of the content
+        nonEmptyMatcher.appendTail(finalSb);
+
+        return finalSb.toString();
+    }
 }
diff --git a/app/src/main/java/eu/toldi/infinityforlemmy/post/ParsePost.java b/app/src/main/java/eu/toldi/infinityforlemmy/post/ParsePost.java
index 74ad6cba..7e1c614f 100644
--- a/app/src/main/java/eu/toldi/infinityforlemmy/post/ParsePost.java
+++ b/app/src/main/java/eu/toldi/infinityforlemmy/post/ParsePost.java
@@ -31,6 +31,7 @@ import java.util.concurrent.Executor;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import eu.toldi.infinityforlemmy.markdown.MarkdownUtils;
 import eu.toldi.infinityforlemmy.postfilter.PostFilter;
 import eu.toldi.infinityforlemmy.utils.JSONUtils;
 import eu.toldi.infinityforlemmy.utils.LemmyUtils;
@@ -640,17 +641,17 @@ public class ParsePost {
                 }
             }
         }
-        if(data.getBoolean("read")){
+        if (data.getBoolean("read")) {
             post.markAsRead();
         }
-        if(!data.isNull("my_vote")){
+        if (!data.isNull("my_vote")) {
             post.setVoteType(data.getInt("my_vote"));
-            post.setScore(post.getScore()-1);
+            post.setScore(post.getScore() - 1);
         }
 
 
         if (!data.getJSONObject("post").isNull("body")) {
-            String body = data.getJSONObject("post").getString("body");
+            String body = MarkdownUtils.processImageCaptions(data.getJSONObject("post").getString("body"), "Image");
             post.setSelfText(body);
             post.setSelfTextPlain(body);
             post.setSelfTextPlainTrimmed(body.trim());