| /*=============================================================================# |
| # Copyright (c) 2015, 2018 David Green and others. |
| # |
| # This program and the accompanying materials are made available under the |
| # terms of the Eclipse Public License 2.0 which is available at |
| # https://www.eclipse.org/legal/epl-2.0. |
| # |
| # SPDX-License-Identifier: EPL-2.0 |
| # |
| # Contributors: |
| # David Green - org.eclipse.mylyn.docs: initial API and implementation |
| # Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation |
| #=============================================================================*/ |
| |
| package org.eclipse.statet.internal.docmlet.wikitext.commonmark.core.inlines; |
| |
| import java.net.URLDecoder; |
| import java.nio.charset.StandardCharsets; |
| import java.util.List; |
| import java.util.regex.Matcher; |
| |
| import org.eclipse.mylyn.wikitext.parser.DocumentBuilder; |
| |
| import com.google.common.escape.Escaper; |
| import com.google.common.net.UrlEscapers; |
| |
| import org.eclipse.statet.jcommons.collections.ImCollections; |
| |
| import org.eclipse.statet.docmlet.wikitext.core.source.LabelInfo; |
| import org.eclipse.statet.internal.docmlet.wikitext.commonmark.core.CommonmarkLocator; |
| import org.eclipse.statet.internal.docmlet.wikitext.commonmark.core.Cursor; |
| import org.eclipse.statet.internal.docmlet.wikitext.commonmark.core.Line; |
| import org.eclipse.statet.internal.docmlet.wikitext.commonmark.core.ProcessingContext; |
| import org.eclipse.statet.internal.docmlet.wikitext.commonmark.core.ProcessingContext.UriWithTitle; |
| |
| |
| public class PotentialBracketCloseDelimiter extends InlineWithText { |
| |
| |
| private final PotentialBracketRegex shared; |
| |
| |
| public PotentialBracketCloseDelimiter(final Line line, final int offset, |
| final PotentialBracketRegex shared) { |
| super(line, offset, 1, 1, "]"); |
| |
| this.shared= shared; |
| } |
| |
| |
| @Override |
| public void apply(final ProcessingContext context, final List<Inline> inlines, |
| final Cursor cursor, final boolean inBlock) { |
| final int openingDelimiterIndex= findLastPotentialBracketDelimiter(inlines); |
| if (openingDelimiterIndex >= 0) { |
| final PotentialBracketOpenDelimiter openingDelimiter= (PotentialBracketOpenDelimiter) inlines.get(openingDelimiterIndex); |
| |
| if (openingDelimiter.isActive()) { |
| final boolean referenceDefinition= (inBlock |
| && cursor.hasNext() && cursor.getNext() == ':' |
| && isEligibleForReferenceDefinition(inlines, openingDelimiter, openingDelimiterIndex) ); |
| final Matcher matcher= (cursor.hasNext()) ? |
| cursor.setup((referenceDefinition) ? |
| this.shared.getReferenceDefinitionEndMatcher() : |
| this.shared.getEndMatcher(), |
| 1) : |
| null; |
| |
| final List<Inline> contents= InlineParser.secondPass( |
| inlines.subList(openingDelimiterIndex + 1, inlines.size() )); |
| |
| if (!openingDelimiter.isLinkDelimiter() || !containsLink(contents)) { |
| |
| if (matcher != null /*== cursor.hasNext()*/ && matcher.matches()) { |
| final LabelInfo referenceLabel= (referenceDefinition) ? |
| referenceLabel(context, cursor, contents) : |
| null; |
| final String uri= linkUri(matcher, context, cursor); |
| |
| if (!referenceDefinition |
| || (referenceLabel != null && uri != null && !uri.isEmpty()) ) { |
| final String title= linkTitle(matcher, context, cursor); |
| |
| final int closingLength= 1 + matcher.end(4) - matcher.regionStart(); |
| cursor.advance(closingLength); |
| |
| final int startOffset= openingDelimiter.getStartOffset(); |
| final int endOffset= cursor.getOffset(); |
| |
| truncate(inlines, openingDelimiter, openingDelimiterIndex, |
| referenceDefinition ); |
| |
| if (openingDelimiter.isLinkDelimiter()) { |
| inactivatePreceding(inlines); |
| } |
| |
| if (referenceDefinition) { |
| inlines.add(new ReferenceDefinition(openingDelimiter.getLine(), |
| startOffset, endOffset - startOffset, |
| uri, title, referenceLabel )); |
| } |
| else if (openingDelimiter.isImageDelimiter()) { |
| inlines.add(new Image(openingDelimiter.getLine(), |
| startOffset, endOffset - startOffset, uri, |
| title, contents )); |
| } |
| else { |
| inlines.add(new Link(openingDelimiter.getLine(), |
| startOffset, endOffset - startOffset, |
| uri, title, contents )); |
| } |
| |
| return; |
| } |
| } |
| else { |
| int closingLength= 1; |
| LabelInfo referenceLabel= referenceLabel(context, cursor, contents); |
| if (cursor.hasNext()) { |
| final Matcher referenceLabelMatcher= cursor.setup( |
| this.shared.getReferenceLabelMatcher(), |
| 1 ); |
| if (referenceLabelMatcher.matches()) { |
| final String label= context.normalizeLabel(referenceLabelMatcher.group(2)); |
| if (label != null) { |
| final int start= cursor.getMatcherOffset(referenceLabelMatcher.start(2)); |
| final int end= cursor.getMatcherOffset(referenceLabelMatcher.end(2)); |
| referenceLabel= new LabelInfo(label, start, end); |
| } |
| closingLength+= referenceLabelMatcher.end(1) - referenceLabelMatcher.regionStart(); |
| } |
| } |
| |
| if (referenceLabel != null) { |
| if (context.getMode() == ProcessingContext.PARSE_SOURCE_STRUCT) { |
| cursor.advance(closingLength); |
| |
| final int startOffset= openingDelimiter.getStartOffset(); |
| final int endOffset= cursor.getOffset(); |
| |
| truncate(inlines, openingDelimiter, openingDelimiterIndex, false); |
| |
| if (openingDelimiter.isLinkDelimiter()) { |
| inactivatePreceding(inlines); |
| } |
| |
| if (openingDelimiter.isLinkDelimiter()) { |
| inlines.add(new Link(openingDelimiter.getLine(), |
| startOffset, endOffset - startOffset, |
| referenceLabel, ImCollections.<Inline>emptyList() )); |
| } |
| else { |
| inlines.add(new Image(openingDelimiter.getLine(), |
| startOffset, endOffset - startOffset, |
| referenceLabel, contents )); |
| } |
| |
| return; |
| } |
| |
| final UriWithTitle uriWithTitle= context.getNamedUri(referenceLabel.getLabel()); |
| if (uriWithTitle != null) { |
| cursor.advance(closingLength); |
| |
| final int startOffset= openingDelimiter.getStartOffset(); |
| final int endOffset= cursor.getOffset(); |
| |
| truncate(inlines, openingDelimiter, openingDelimiterIndex, false); |
| |
| if (openingDelimiter.isLinkDelimiter()) { |
| inactivatePreceding(inlines); |
| } |
| |
| if (openingDelimiter.isLinkDelimiter()) { |
| inlines.add(new Link(openingDelimiter.getLine(), |
| startOffset, endOffset - startOffset, |
| uriWithTitle.getUri(), uriWithTitle.getTitle(), contents )); |
| } |
| else { |
| inlines.add(new Image(openingDelimiter.getLine(), |
| startOffset, endOffset - startOffset, |
| uriWithTitle.getUri(), uriWithTitle.getTitle(), contents )); |
| } |
| |
| return; |
| } |
| } |
| } |
| } |
| } |
| |
| replaceDelimiter(inlines, openingDelimiterIndex, openingDelimiter); |
| } |
| |
| if (Characters.append(inlines, inlines.size(), this)) { |
| cursor.advance(getLength()); |
| return; |
| } |
| super.apply(context, inlines, cursor, inBlock); |
| } |
| |
| @Override |
| public void emit(final ProcessingContext context, |
| final CommonmarkLocator locator, final DocumentBuilder builder) { |
| builder.characters(this.text); |
| } |
| |
| |
| private LabelInfo referenceLabel(final ProcessingContext context, final Cursor cursor, |
| final List<Inline> contents) { |
| if (contents.isEmpty()) { |
| return null; |
| } |
| final int start= contents.get(0).getStartOffset(); |
| final int end= getStartOffset(); |
| String name= cursor.getText( |
| cursor.toCursorOffset(start), |
| cursor.toCursorOffset(end) ); |
| if (this.shared.getReferenceNameMatcher().reset(name).matches()) { |
| name= context.normalizeLabel(name); |
| if (name != null) { |
| return new LabelInfo(name, start, end); |
| } |
| } |
| return null; |
| } |
| |
| private boolean containsLink(final List<Inline> contents) { |
| for (final Inline inline : contents) { |
| if (inline instanceof Link) { |
| return true; |
| } else if (inline instanceof InlineWithNestedContents |
| && containsLink(((InlineWithNestedContents) inline).getContents())) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private int findLastPotentialBracketDelimiter(final List<Inline> inlines) { |
| for (int idx= inlines.size() - 1; idx >= 0; --idx) { |
| final Inline inline= inlines.get(idx); |
| if (inline instanceof PotentialBracketOpenDelimiter) { |
| return idx; |
| } |
| } |
| return -1; |
| } |
| |
| private boolean isIndentInline(final Inline inline, final Line line) { |
| return (inline instanceof Characters |
| && inline.getStartOffset() == line.getStartOffset() |
| && inline.getLength() == line.getIndentLength() ); |
| } |
| |
| boolean isEligibleForReferenceDefinition(final List<Inline> inlines, |
| final PotentialBracketOpenDelimiter openingDelimiter, final int openingDelimiterIndex) { |
| final Line openingLine= openingDelimiter.getLine(); |
| if (openingDelimiter.isLinkDelimiter() |
| && openingLine.getIndent() < 4 |
| && openingDelimiter.getStartOffset() == openingLine.getStartOffset() + openingLine.getIndentLength() ) { |
| if (openingDelimiterIndex > 0) { |
| int idx= openingDelimiterIndex - 1; |
| { final Inline inline= inlines.get(idx--); |
| if (!(inline instanceof ReferenceDefinition |
| || isIndentInline(inline, openingLine) )) { |
| return false; |
| } |
| } |
| while (idx >= 0) { |
| final Inline inline= inlines.get(idx--); |
| if (!(inline instanceof ReferenceDefinition)) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| private String linkTitle(final Matcher matcher, final ProcessingContext context, final Cursor cursor) { |
| final int start= matcher.start(3); |
| if (start != -1) { |
| final int end= matcher.end(3); |
| final String title= cursor.getText(start + 1, end - 1); |
| return context.getHelper().replaceEscaping(title); |
| } |
| return ""; |
| } |
| |
| private String linkUri(final Matcher matcher, final ProcessingContext context, final Cursor cursor) { |
| String uriWithEscapes= matcher.group(1); |
| if (uriWithEscapes == null) { |
| uriWithEscapes= matcher.group(2); |
| if (uriWithEscapes == null) { |
| uriWithEscapes= ""; |
| } |
| } |
| final String uri= context.getHelper().replaceEscaping(uriWithEscapes); |
| return normalizeUri(uri); |
| } |
| |
| private String normalizeUri(final String uri) { |
| try { |
| final String decoded= URLDecoder.decode(uri, StandardCharsets.UTF_8.name()); |
| final Escaper escaper= UrlEscapers.urlFragmentEscaper(); |
| final int indexOfHash= decoded.indexOf('#'); |
| if (indexOfHash != -1) { |
| String uriWithHash= escaper.escape(decoded.substring(0, indexOfHash)) + '#'; |
| if ((indexOfHash + 1) < decoded.length()) { |
| uriWithHash+= escaper.escape(decoded.substring(indexOfHash + 1)); |
| } |
| return uriWithHash; |
| } |
| return escaper.escape(decoded); |
| } catch (final Exception e) { |
| return uri; |
| } |
| } |
| |
| public void truncate(final List<Inline> inlines, |
| final PotentialBracketOpenDelimiter openingDelimiter, final int indexOfOpeningDelimiter, |
| final boolean removeIndent) { |
| while (inlines.size() > indexOfOpeningDelimiter) { |
| inlines.remove(indexOfOpeningDelimiter); |
| } |
| if (removeIndent && indexOfOpeningDelimiter > 0 |
| && isIndentInline(inlines.get(indexOfOpeningDelimiter - 1), openingDelimiter.getLine()) ) { |
| inlines.remove(indexOfOpeningDelimiter - 1); |
| } |
| } |
| |
| private void inactivatePreceding(final List<Inline> inlines) { |
| for (int idx= inlines.size() - 1; idx >= 0; idx--) { |
| final Inline inline= inlines.get(idx); |
| if (inline instanceof PotentialBracketOpenDelimiter) { |
| final PotentialBracketOpenDelimiter openDelimiter= (PotentialBracketOpenDelimiter) inline; |
| if (openDelimiter.isLinkDelimiter()) { |
| if (openDelimiter.isActive()) { |
| openDelimiter.setInactive(); |
| } |
| else { |
| return; |
| } |
| } |
| } |
| } |
| } |
| |
| private void replaceDelimiter(final List<Inline> inlines, |
| final int index, final PotentialBracketOpenDelimiter delimiter) { |
| if (Characters.append(inlines, index, delimiter)) { |
| inlines.remove(index); |
| return; |
| } |
| inlines.set(index, |
| new Characters(delimiter.getLine(), |
| delimiter.getStartOffset(), delimiter.getLength(), delimiter.getCursorLength(), |
| delimiter.getText() )); |
| } |
| |
| } |
