From 4bcd60aafdfdc28c764c8239c82dab0886e40781 Mon Sep 17 00:00:00 2001
From: Docile-Alligator <25734209+Docile-Alligator@users.noreply.github.com>
Date: Sun, 26 Nov 2023 14:52:18 -0500
Subject: Handle preview images or gifs with captions.

---
 .../markdown/ImageAndGifBlockParser.java           | 20 ++++---
 .../infinityforreddit/utils/Utils.java             | 64 +++++++++++++++++-----
 2 files changed, 61 insertions(+), 23 deletions(-)

(limited to 'app/src/main/java/ml/docilealligator/infinityforreddit')

diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/ImageAndGifBlockParser.java b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/ImageAndGifBlockParser.java
index ca71d4bd..4cdd3fd6 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/ImageAndGifBlockParser.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/ImageAndGifBlockParser.java
@@ -35,13 +35,13 @@ public class ImageAndGifBlockParser extends AbstractBlockParser {
     }
 
     public static class Factory extends AbstractBlockParserFactory {
-        private final Pattern redditPreviewPattern =  Pattern.compile("!\\[img]\\(https://preview.redd.it/\\w+.(jpg|png|jpeg)((\\?+[-a-zA-Z0-9()@:%_+.~#?&/=]*)|)\\)");
-        private final Pattern iRedditPattern = Pattern.compile("!\\[img]\\(https://i.redd.it/\\w+.(jpg|png|jpeg|gif)\\)");
+        private final Pattern redditPreviewPattern =  Pattern.compile("!\\[.*]\\(https://preview.redd.it/\\w+.(jpg|png|jpeg)((\\?+[-a-zA-Z0-9()@:%_+.~#?&/=]*)|)\\)");
+        private final Pattern iRedditPattern = Pattern.compile("!\\[.*]\\(https://i.redd.it/\\w+.(jpg|png|jpeg|gif)\\)");
         private final Pattern gifPattern = Pattern.compile("!\\[gif]\\(giphy\\|\\w+(\\|downsized)?\\)");
         @Nullable
         private Map<String, MediaMetadata> mediaMetadataMap;
-        private final int fromIndex = "![img](https://preview.redd.it/".length();
-        private final int fromIndexIReddit = "![img](https://i.redd.it/".length();
+        private final int previewReddItLength = "https://preview.redd.it/".length();
+        private final int iReddItLength = "https://i.redd.it/".length();
 
         @Override
         public BlockStart tryStart(ParserState state, MatchedBlockParser matchedBlockParser) {
@@ -53,9 +53,11 @@ public class ImageAndGifBlockParser extends AbstractBlockParser {
             Matcher matcher = redditPreviewPattern.matcher(line);
             if (matcher.find()) {
                 if (matcher.end() == line.length()) {
-                    int endIndex = line.indexOf('.', fromIndex);
+                    int endIndex = line.indexOf('.', previewReddItLength);
                     if (endIndex > 0) {
-                        String id = line.substring(fromIndex, endIndex);
+                        int urlStartIndex = line.lastIndexOf("https://preview.redd.it/", matcher.end());
+                        String id = line.substring(previewReddItLength + urlStartIndex,
+                                line.indexOf(".", previewReddItLength + urlStartIndex));
                         return mediaMetadataMap.containsKey(id) ? BlockStart.of(new ImageAndGifBlockParser(mediaMetadataMap.get(id))) : BlockStart.none();
                     }
                 }
@@ -64,9 +66,11 @@ public class ImageAndGifBlockParser extends AbstractBlockParser {
             matcher = iRedditPattern.matcher(line);
             if (matcher.find()) {
                 if (matcher.end() == line.length()) {
-                    int endIndex = line.indexOf('.', fromIndexIReddit);
+                    int endIndex = line.indexOf('.', iReddItLength);
                     if (endIndex > 0) {
-                        String id = line.substring(fromIndexIReddit, endIndex);
+                        int urlStartIndex = line.lastIndexOf("https://i.redd.it/", matcher.end());
+                        String id = line.substring(iReddItLength + urlStartIndex,
+                                line.indexOf(".", iReddItLength + urlStartIndex));
                         return mediaMetadataMap.containsKey(id) ? BlockStart.of(new ImageAndGifBlockParser(mediaMetadataMap.get(id))) : BlockStart.none();
                     }
                 }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/utils/Utils.java b/app/src/main/java/ml/docilealligator/infinityforreddit/utils/Utils.java
index c47c879a..9f3167b9 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/utils/Utils.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/utils/Utils.java
@@ -73,11 +73,10 @@ public final class Utils {
             Pattern.compile("((?<=[\\s])|^)/[rRuU]/[\\w-]+/{0,1}"),
             Pattern.compile("((?<=[\\s])|^)[rRuU]/[\\w-]+/{0,1}"),
             Pattern.compile("\\^{2,}"),
-            Pattern.compile("!\\[gif]\\(giphy\\|\\w+\\)"),
-            Pattern.compile("!\\[gif]\\(giphy\\|\\w+\\|downsized\\)"),
-            Pattern.compile("!\\[gif]\\(emote\\|\\w+\\|\\w+\\)"),
-            Pattern.compile("https://preview.redd.it/\\w+.(jpg|png|jpeg)((\\?+[-a-zA-Z0-9()@:%_+.~#?&/=]*)|)"),
-            Pattern.compile("https://i.redd.it/\\w+.(jpg|png|jpeg|gif)")
+            //Sometimes the reddit preview images and gifs have a caption and the markdown will become [caption](image_link)
+            Pattern.compile("(\\[(?:(?!((?<!\\\\)\\[)).)*?]\\()?https://preview.redd.it/\\w+.(jpg|png|jpeg)((\\?+[-a-zA-Z0-9()@:%_+.~#?&/=]*)|)"),
+            //Same reason as above. But this time it only matches [caption](image-link. Notice there is no ) at the end.
+            Pattern.compile("(\\[(?:(?!((?<!\\\\)\\[)).)*?]\\()?https://i.redd.it/\\w+.(jpg|png|jpeg|gif)")
     };
 
     public static String modifyMarkdown(String markdown) {
@@ -94,35 +93,70 @@ public final class Utils {
         }
 
         StringBuilder markdownStringBuilder = new StringBuilder(markdown);
-        Pattern previewReddItImagePattern = REGEX_PATTERNS[6];
+        Pattern previewReddItImagePattern = REGEX_PATTERNS[3];
         Matcher matcher = previewReddItImagePattern.matcher(markdownStringBuilder);
         int start = 0;
         int previewReddItLength = "https://preview.redd.it/".length();
         while (matcher.find(start)) {
-            String id = markdownStringBuilder.substring(matcher.start() + previewReddItLength, markdownStringBuilder.indexOf(".", matcher.start() + previewReddItLength));
+            String id;
+            if (markdownStringBuilder.charAt(matcher.start()) == '[') {
+                //Has caption
+                int urlStartIndex = markdownStringBuilder.lastIndexOf("https://preview.redd.it/", matcher.end());
+                id = markdownStringBuilder.substring(previewReddItLength + urlStartIndex,
+                        markdownStringBuilder.indexOf(".", previewReddItLength + urlStartIndex));
+            } else {
+                id = markdownStringBuilder.substring(matcher.start() + previewReddItLength,
+                        markdownStringBuilder.indexOf(".", matcher.start() + previewReddItLength));
+            }
+
             if (!mediaMetadataMap.containsKey(id)) {
                 start = matcher.end();
                 continue;
             }
-            String replacingText = "![img](" + markdownStringBuilder.substring(matcher.start(), matcher.end()) + ")";
-            markdownStringBuilder.replace(matcher.start(), matcher.end(), replacingText);
-            start = replacingText.length() + matcher.start();
+
+            if (markdownStringBuilder.charAt(matcher.start()) == '[') {
+                //Has caption
+                markdownStringBuilder.insert(matcher.start(), '!');
+                start = matcher.end() + 1;
+            } else {
+                String replacingText = "![img](" + markdownStringBuilder.substring(matcher.start(), matcher.end()) + ")";
+                markdownStringBuilder.replace(matcher.start(), matcher.end(), replacingText);
+                start = replacingText.length() + matcher.start();
+            }
+
             matcher = previewReddItImagePattern.matcher(markdownStringBuilder);
         }
 
         start = 0;
-        Pattern iReddItImagePattern = REGEX_PATTERNS[7];
+        Pattern iReddItImagePattern = REGEX_PATTERNS[4];
         matcher = iReddItImagePattern.matcher(markdownStringBuilder);
         int iReddItLength = "https://i.redd.it/".length();
         while (matcher.find(start)) {
-            String id = markdownStringBuilder.substring(matcher.start() + iReddItLength, matcher.start() + markdownStringBuilder.indexOf(".", iReddItLength));
+            String id;
+            if (markdownStringBuilder.charAt(matcher.start()) == '[') {
+                //Has caption
+                int urlStartIndex = markdownStringBuilder.lastIndexOf("https://i.redd.it/", matcher.end());
+                id = markdownStringBuilder.substring(iReddItLength + urlStartIndex,
+                        markdownStringBuilder.indexOf(".", iReddItLength + urlStartIndex));
+            } else {
+                id = markdownStringBuilder.substring(matcher.start() + iReddItLength, matcher.start() + markdownStringBuilder.indexOf(".", iReddItLength));
+            }
+
             if (!mediaMetadataMap.containsKey(id)) {
                 start = matcher.end();
                 continue;
             }
-            String replacingText = "![img](" + markdownStringBuilder.substring(matcher.start(), matcher.end()) + ")";
-            markdownStringBuilder.replace(matcher.start(), matcher.end(), replacingText);
-            start = replacingText.length() + matcher.start();
+
+            if (markdownStringBuilder.charAt(matcher.start()) == '[') {
+                //Has caption
+                markdownStringBuilder.insert(matcher.start(), '!');
+                start = matcher.end() + 1;
+            } else {
+                String replacingText = "![img](" + markdownStringBuilder.substring(matcher.start(), matcher.end()) + ")";
+                markdownStringBuilder.replace(matcher.start(), matcher.end(), replacingText);
+                start = replacingText.length() + matcher.start();
+            }
+
             matcher = iReddItImagePattern.matcher(markdownStringBuilder);
         }
 
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