FixedEmphasisDelimiterProcessor.java
/*
* Portions of this software was developed by employees of the National Institute
* of Standards and Technology (NIST), an agency of the Federal Government and is
* being made available as a public service. Pursuant to title 17 United States
* Code Section 105, works of NIST employees are not subject to copyright
* protection in the United States. This software may be subject to foreign
* copyright. Permission in the United States and in foreign countries, to the
* extent that NIST may hold copyright, to use, copy, modify, create derivative
* works, and distribute this software and its documentation without fee is hereby
* granted on a non-exclusive basis, provided that this notice and disclaimer
* of warranty appears in all copies.
*
* THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
* EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
* THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
* INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
* SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE. IN NO EVENT
* SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
* INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
* OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
* CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
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* OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
*/
package gov.nist.secauto.metaschema.core.datatype.markup.flexmark;
import com.vladsch.flexmark.ast.Emphasis;
import com.vladsch.flexmark.ast.StrongEmphasis;
import com.vladsch.flexmark.parser.core.delimiter.AsteriskDelimiterProcessor;
import com.vladsch.flexmark.parser.core.delimiter.Delimiter;
import com.vladsch.flexmark.parser.core.delimiter.EmphasisDelimiterProcessor;
import com.vladsch.flexmark.parser.delimiter.DelimiterRun;
import com.vladsch.flexmark.util.ast.DelimitedNode;
import com.vladsch.flexmark.util.misc.Utils;
import com.vladsch.flexmark.util.sequence.BasedSequence;
/**
* Provides a temporary fix for the broken {@link EmphasisDelimiterProcessor} in
* Flexmark.
*/
public class FixedEmphasisDelimiterProcessor
extends AsteriskDelimiterProcessor {
// TODO: remove this class once vsch/flexmark-java#580 is merged
private final int multipleUse;
public FixedEmphasisDelimiterProcessor(boolean strongWrapsEmphasis) {
super(strongWrapsEmphasis);
this.multipleUse = strongWrapsEmphasis ? 1 : 2;
}
@SuppressWarnings("PMD.OnlyOneReturn") // for readability
@Override
public int getDelimiterUse(DelimiterRun opener, DelimiterRun closer) {
// "multiple of 3" rule for internal delimiter runs
if ((opener.canClose() || closer.canOpen()) && (opener.length() + closer.length()) % 3 == 0) {
if (opener.length() % 3 == 0 && closer.length() % 3 == 0) {
return this.multipleUse; // if they are each a multiple of 3, then emphasis can be created
}
return 0;
}
// calculate actual number of delimiters used from this closer
if (opener.length() < 3 || closer.length() < 3) {
return Utils.min(closer.length(), opener.length());
}
// default to latest spec
return closer.length() % 2 == 0 ? 2 : multipleUse;
}
@Override
public void process(Delimiter opener, Delimiter closer, int delimitersUsed) {
DelimitedNode emphasis = delimitersUsed == 1
? new Emphasis(opener.getTailChars(delimitersUsed), BasedSequence.NULL, closer.getLeadChars(delimitersUsed))
: new StrongEmphasis(opener.getTailChars(delimitersUsed), BasedSequence.NULL,
closer.getLeadChars(delimitersUsed));
opener.moveNodesBetweenDelimitersTo(emphasis, closer);
}
}