diff options
Diffstat (limited to 'app/src/main/java/ml/docilealligator')
8 files changed, 240 insertions, 188 deletions
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerClosingInlineProcessor.java b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerClosingInlineProcessor.java new file mode 100644 index 00000000..e39dd6c9 --- /dev/null +++ b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerClosingInlineProcessor.java @@ -0,0 +1,61 @@ +package ml.docilealligator.infinityforreddit.markdown; + +import static io.noties.markwon.inlineparser.InlineParserUtils.mergeChildTextNodes; + +import androidx.annotation.NonNull; +import androidx.annotation.Nullable; + +import org.commonmark.node.Node; + +import io.noties.markwon.inlineparser.InlineProcessor; + +/** + * Parses spoiler closing markdown ({@code !<}) and creates {@link SpoilerNode SpoilerNodes}. + * Relies on {@link SpoilerOpeningInlineProcessor} to handle opening. + * + * Implementation inspired by {@link io.noties.markwon.inlineparser.CloseBracketInlineProcessor} + */ +public class SpoilerClosingInlineProcessor extends InlineProcessor { + @NonNull + private final SpoilerOpeningBracketStorage spoilerOpeningBracketStorage; + + public SpoilerClosingInlineProcessor(@NonNull SpoilerOpeningBracketStorage spoilerOpeningBracketStorage) { + this.spoilerOpeningBracketStorage = spoilerOpeningBracketStorage; + } + + @Override + public char specialCharacter() { + return '!'; + } + + @Nullable + @Override + protected Node parse() { + index++; + if (peek() != '<') { + return null; + } + index++; + + SpoilerOpeningBracket spoilerOpeningBracket = spoilerOpeningBracketStorage.pop(block); + if (spoilerOpeningBracket == null) { + return null; + } + + SpoilerNode spoilerNode = new SpoilerNode(); + Node node = spoilerOpeningBracket.node.getNext(); + while (node != null) { + Node next = node.getNext(); + spoilerNode.appendChild(node); + node = next; + } + + // Process delimiters such as emphasis inside spoiler + processDelimiters(spoilerOpeningBracket.previousDelimiter); + mergeChildTextNodes(spoilerNode); + // We don't need the corresponding text node anymore, we turned it into a spoiler node + spoilerOpeningBracket.node.unlink(); + + return spoilerNode; + } +} diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerNode.java b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerNode.java new file mode 100644 index 00000000..2f1d9774 --- /dev/null +++ b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerNode.java @@ -0,0 +1,6 @@ +package ml.docilealligator.infinityforreddit.markdown; + +import org.commonmark.node.CustomNode; + +public class SpoilerNode extends CustomNode { +} diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpening.java b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpening.java deleted file mode 100644 index 279cba65..00000000 --- a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpening.java +++ /dev/null @@ -1,21 +0,0 @@ -package ml.docilealligator.infinityforreddit.markdown; - -import org.commonmark.node.CustomNode; -import org.commonmark.node.Visitor; - -class SpoilerOpening extends CustomNode { - private String literal; - - @Override - public void accept(Visitor visitor) { - visitor.visit(this); - } - - public String getLiteral() { - return literal; - } - - public void setLiteral(String literal) { - this.literal = literal; - } -} diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningBracket.java b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningBracket.java new file mode 100644 index 00000000..64995255 --- /dev/null +++ b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningBracket.java @@ -0,0 +1,27 @@ +package ml.docilealligator.infinityforreddit.markdown; + +import org.commonmark.internal.Delimiter; +import org.commonmark.node.Node; + +public class SpoilerOpeningBracket { + /** + * Node that contains spoiler opening markdown ({@code >!}). + */ + public final Node node; + + /** + * Previous bracket. + */ + public final SpoilerOpeningBracket previous; + + /** + * Previous delimiter (emphasis, etc) before this bracket. + */ + public final Delimiter previousDelimiter; + + public SpoilerOpeningBracket(Node node, SpoilerOpeningBracket previous, Delimiter previousDelimiter) { + this.node = node; + this.previous = previous; + this.previousDelimiter = previousDelimiter; + } +} diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningBracketStorage.java b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningBracketStorage.java new file mode 100644 index 00000000..444975b4 --- /dev/null +++ b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningBracketStorage.java @@ -0,0 +1,38 @@ +package ml.docilealligator.infinityforreddit.markdown; + +import androidx.annotation.Nullable; + +import org.commonmark.internal.Delimiter; +import org.commonmark.node.Node; + +public class SpoilerOpeningBracketStorage { + @Nullable + private SpoilerOpeningBracket lastBracket; + private Node currentBlock; + + public void clear() { + lastBracket = null; + } + + public void add(Node block, Node node, Delimiter lastDelimiter) { + updateBlock(block); + lastBracket = new SpoilerOpeningBracket(node, lastBracket, lastDelimiter); + } + + @Nullable + public SpoilerOpeningBracket pop(Node block) { + updateBlock(block); + SpoilerOpeningBracket bracket = lastBracket; + if (bracket != null) { + lastBracket = bracket.previous; + } + return bracket; + } + + private void updateBlock(Node block) { + if (block != currentBlock) { + clear(); + } + currentBlock = block; + } +} diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningInlineProcessor.java b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningInlineProcessor.java new file mode 100644 index 00000000..487325d7 --- /dev/null +++ b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningInlineProcessor.java @@ -0,0 +1,40 @@ +package ml.docilealligator.infinityforreddit.markdown; + +import androidx.annotation.NonNull; +import androidx.annotation.Nullable; + +import org.commonmark.node.Node; +import org.commonmark.node.Text; + +import io.noties.markwon.inlineparser.InlineProcessor; + +/** + * Parses spoiler opening markdown ({@code >!}). Relies on {@link SpoilerClosingInlineProcessor} + * to handle closing and create {@link SpoilerNode SpoilerNodes}. + */ +public class SpoilerOpeningInlineProcessor extends InlineProcessor { + @NonNull + private final SpoilerOpeningBracketStorage spoilerOpeningBracketStorage; + + public SpoilerOpeningInlineProcessor(@NonNull SpoilerOpeningBracketStorage spoilerOpeningBracketStorage) { + this.spoilerOpeningBracketStorage = spoilerOpeningBracketStorage; + } + + @Override + public char specialCharacter() { + return '>'; + } + + @Nullable + @Override + protected Node parse() { + index++; + if (peek() == '!') { + index++; + Text node = text(">!"); + spoilerOpeningBracketStorage.add(block, node, lastDelimiter()); + return node; + } + return null; + } +} diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningParser.java b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningParser.java deleted file mode 100644 index 391e4a88..00000000 --- a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerOpeningParser.java +++ /dev/null @@ -1,27 +0,0 @@ -package ml.docilealligator.infinityforreddit.markdown; - -import androidx.annotation.Nullable; - -import org.commonmark.node.Node; - -import io.noties.markwon.inlineparser.InlineProcessor; - -public class SpoilerOpeningParser extends InlineProcessor { - @Override - public char specialCharacter() { - return '>'; - } - - @Nullable - @Override - protected Node parse() { - index++; - if (peek() == '!') { - index++; - SpoilerOpening node = new SpoilerOpening(); - node.setLiteral(">!"); - return node; - } - return null; - } -} diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerParserPlugin.java b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerParserPlugin.java index 0875fef7..623b3d98 100644 --- a/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerParserPlugin.java +++ b/app/src/main/java/ml/docilealligator/infinityforreddit/markdown/SpoilerParserPlugin.java @@ -1,6 +1,5 @@ package ml.docilealligator.infinityforreddit.markdown; -import android.graphics.Color; import android.text.SpannableStringBuilder; import android.text.Spanned; import android.widget.TextView; @@ -10,25 +9,24 @@ import androidx.annotation.NonNull; import org.commonmark.node.Block; import org.commonmark.node.BlockQuote; import org.commonmark.node.HtmlBlock; +import org.commonmark.node.Node; import org.commonmark.parser.Parser; import java.util.ArrayList; -import java.util.Collections; +import java.util.List; import java.util.Set; -import java.util.Stack; import io.noties.markwon.AbstractMarkwonPlugin; +import io.noties.markwon.MarkwonSpansFactory; import io.noties.markwon.MarkwonVisitor; import io.noties.markwon.core.CorePlugin; -import io.noties.markwon.core.spans.CodeBlockSpan; -import io.noties.markwon.core.spans.CodeSpan; import io.noties.markwon.inlineparser.MarkwonInlineParserPlugin; public class SpoilerParserPlugin extends AbstractMarkwonPlugin { private final int textColor; private final int backgroundColor; - private boolean textHasSpoiler = false; - private int firstSpoilerStart = -1; + + private final SpoilerOpeningBracketStorage spoilerOpeningBracketStorage = new SpoilerOpeningBracketStorage(); SpoilerParserPlugin(int textColor, int backgroundColor) { this.textColor = textColor; @@ -40,20 +38,43 @@ public class SpoilerParserPlugin extends AbstractMarkwonPlugin { } @Override + public void configureSpansFactory(@NonNull MarkwonSpansFactory.Builder builder) { + builder.setFactory(SpoilerNode.class, (config, renderProps) -> + new SpoilerSpan(textColor, backgroundColor)); + } + + @Override public void configureVisitor(@NonNull MarkwonVisitor.Builder builder) { - builder.on(SpoilerOpening.class, (visitor, opening) -> { - textHasSpoiler = true; - if (firstSpoilerStart == -1) { - firstSpoilerStart = visitor.length(); + builder.on(SpoilerNode.class, new MarkwonVisitor.NodeVisitor<>() { + int depth = 0; + + @Override + public void visit(@NonNull MarkwonVisitor visitor, @NonNull SpoilerNode spoilerNode) { + int start = visitor.length(); + depth++; + visitor.visitChildren(spoilerNode); + depth--; + if (depth == 0) { + // don't add SpoilerSpans inside other SpoilerSpans + visitor.setSpansForNode(spoilerNode, start); + } } - visitor.builder().append(opening.getLiteral()); }); } @Override + public void afterRender(@NonNull Node node, @NonNull MarkwonVisitor visitor) { + spoilerOpeningBracketStorage.clear(); + } + + @Override public void configure(@NonNull Registry registry) { - registry.require(MarkwonInlineParserPlugin.class, plugin -> - plugin.factoryBuilder().addInlineProcessor(new SpoilerOpeningParser()) + registry.require(MarkwonInlineParserPlugin.class, plugin -> { + plugin.factoryBuilder() + .addInlineProcessor(new SpoilerOpeningInlineProcessor(spoilerOpeningBracketStorage)); + plugin.factoryBuilder() + .addInlineProcessor(new SpoilerClosingInlineProcessor(spoilerOpeningBracketStorage)); + } ); } @@ -70,142 +91,49 @@ public class SpoilerParserPlugin extends AbstractMarkwonPlugin { @Override public void afterSetText(@NonNull TextView textView) { - textView.setHighlightColor(Color.TRANSPARENT); - - if (!textHasSpoiler || textView.getText().length() < 5) { - firstSpoilerStart = 0; - return; - } - - SpannableStringBuilder markdownStringBuilder = new SpannableStringBuilder(textView.getText()); - - ArrayList<SpoilerRange> spoilers = parse(markdownStringBuilder, firstSpoilerStart); - firstSpoilerStart = 0; - textHasSpoiler = false; // Since PostDetail can contain multiple TextViews, we do this here - if (spoilers.size() == 0) { - return; - } - - // Process all the found spoilers. We always want to delete the brackets - // because they are in matching pairs. But we want to apply SpoilerSpan - // only to the outermost spoilers because nested spans break revealing-hiding - int openingPosition = -1; - ArrayList<SpoilerBracket> brackets = new ArrayList<>(); - for (SpoilerRange range : spoilers) { - brackets.add(new SpoilerBracket(range.start, true, range.nested)); - brackets.add(new SpoilerBracket(range.end, false, range.nested)); - } - //noinspection ComparatorCombinators as it requires api 24+ - Collections.sort(brackets, (lhs, rhs) -> Integer.compare(lhs.position, rhs.position)); - - int offset = 0; - for (SpoilerBracket bracket: brackets) { - if (bracket.opening) { - int spoilerStart = bracket.position - offset; - if (!bracket.nested) { - openingPosition = spoilerStart; - } - markdownStringBuilder.delete(spoilerStart, spoilerStart + 2); - } else { - int spoilerEnd = bracket.position - offset; - markdownStringBuilder.delete(spoilerEnd, spoilerEnd + 2); - if (!bracket.nested) { - SpoilerSpan spoilerSpan = new SpoilerSpan(textColor, backgroundColor); - markdownStringBuilder.setSpan(spoilerSpan, openingPosition, spoilerEnd, - Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); - } + CharSequence text = textView.getText(); + if (text instanceof Spanned) { + Spanned spannedText = (Spanned) text; + SpoilerSpan[] spans = spannedText.getSpans(0, text.length(), SpoilerSpan.class); + if (spans.length == 0) { + return; } - offset += 2; - } - - if (offset > 0) { - textView.setText(markdownStringBuilder); - } - } - - private boolean noCodeIntersection(SpannableStringBuilder markdown, int position) { - return markdown.getSpans(position, position + 2, CodeSpan.class).length == 0 - && markdown.getSpans(position, position + 2, CodeBlockSpan.class).length == 0; - } - /** Parse spoilers in the string starting from {@code start}. - * - * Returns all spoilers, spoilers that are nested inside other spoilers will have - * {@code nested} set to {@code true}. - * Doesn't allow more than one new line after every non-blank line. - * - * NB: could be optimized to reduce the number of calls to {@link #noCodeIntersection(SpannableStringBuilder, int)} - */ - private ArrayList<SpoilerRange> parse(SpannableStringBuilder markdown, int start) { - final int MAX_NEW_LINE = 1; - int length = markdown.length(); - Stack<Integer> openSpoilerStack = new Stack<>(); - Stack<SpoilerRange> spoilersStack = new Stack<>(); - ArrayList<SpoilerRange> closedSpoilers = new ArrayList<>(); - int new_lines = 0; - for (int i = start; i < length; i++) { - char currentChar = markdown.charAt(i); - if (currentChar == '\n') { - new_lines++; - if (new_lines > MAX_NEW_LINE) { - openSpoilerStack.clear(); - new_lines = 0; - } - } else if ((currentChar != '>') - && (currentChar != '<') - && (currentChar != '!')) { - new_lines = 0; - } else if (currentChar == '>' - && i + 1 < length - && markdown.charAt(i + 1) == '!' - && noCodeIntersection(markdown, i)) { - openSpoilerStack.push(i); - i++; // skip '!' - } else if (openSpoilerStack.size() > 0 - && currentChar == '!' - && i + 1 < length - && markdown.charAt(i + 1) == '<' - && noCodeIntersection(markdown, i)) { - var pos = openSpoilerStack.pop(); - while (!spoilersStack.isEmpty() - && spoilersStack.peek().start > pos) { - SpoilerRange nestedRange = spoilersStack.pop(); - nestedRange.nested = true; - closedSpoilers.add(nestedRange); - } - SpoilerRange range = new SpoilerRange(pos, i); - spoilersStack.push(range); - i++; // skip '<' - } else { - new_lines = 0; + // This is a workaround for Markwon's behavior. + // Markwon adds spans in reversed order so SpoilerSpan is applied first + // and other things (i.e. links, code, etc.) get drawn over it. + // We fix it by removing all SpoilerSpans and adding them again + // so they are applied last. + List<SpanInfo> spanInfo = new ArrayList<>(spans.length); + for (SpoilerSpan span : spans) { + spanInfo.add(new SpanInfo( + span, + spannedText.getSpanStart(span), + spannedText.getSpanEnd(span), + spannedText.getSpanFlags(span) + )); } - } - - closedSpoilers.addAll(spoilersStack); - return closedSpoilers; - } - - private static class SpoilerBracket { - final int position; - final boolean opening; - final boolean nested; - - private SpoilerBracket(int position, boolean opening, boolean nested) { - this.position = position; - this.opening = opening; - this.nested = nested; + SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder(text); + for (SpanInfo info : spanInfo) { + spannableStringBuilder.removeSpan(info.span); + spannableStringBuilder.setSpan(info.span, info.start, info.end, info.flags); + } + textView.setText(spannableStringBuilder); } } - private static class SpoilerRange { - final int start; - final int end; - boolean nested; + private static class SpanInfo { + public final SpoilerSpan span; + public final int start; + public final int end; + public final int flags; - SpoilerRange(int start, int end) { + private SpanInfo(SpoilerSpan span, int start, int end, int flags) { + this.span = span; this.start = start; this.end = end; + this.flags = flags; } } } |