1 /*
2 * Portions of this software was developed by employees of the National Institute
3 * of Standards and Technology (NIST), an agency of the Federal Government and is
4 * being made available as a public service. Pursuant to title 17 United States
5 * Code Section 105, works of NIST employees are not subject to copyright
6 * protection in the United States. This software may be subject to foreign
7 * copyright. Permission in the United States and in foreign countries, to the
8 * extent that NIST may hold copyright, to use, copy, modify, create derivative
9 * works, and distribute this software and its documentation without fee is hereby
10 * granted on a non-exclusive basis, provided that this notice and disclaimer
11 * of warranty appears in all copies.
12 *
13 * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
14 * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
15 * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
17 * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
18 * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE. IN NO EVENT
19 * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
20 * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
21 * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
22 * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
23 * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT
24 * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
25 */
26
27 package gov.nist.secauto.metaschema.core.datatype.markup.flexmark;
28
29 import com.vladsch.flexmark.ast.Emphasis;
30 import com.vladsch.flexmark.ast.StrongEmphasis;
31 import com.vladsch.flexmark.parser.core.delimiter.AsteriskDelimiterProcessor;
32 import com.vladsch.flexmark.parser.core.delimiter.Delimiter;
33 import com.vladsch.flexmark.parser.core.delimiter.EmphasisDelimiterProcessor;
34 import com.vladsch.flexmark.parser.delimiter.DelimiterRun;
35 import com.vladsch.flexmark.util.ast.DelimitedNode;
36 import com.vladsch.flexmark.util.misc.Utils;
37 import com.vladsch.flexmark.util.sequence.BasedSequence;
38
39 /**
40 * Provides a temporary fix for the broken {@link EmphasisDelimiterProcessor} in
41 * Flexmark.
42 */
43 public class FixedEmphasisDelimiterProcessor
44 extends AsteriskDelimiterProcessor {
45 // TODO: remove this class once vsch/flexmark-java#580 is merged
46 private final int multipleUse;
47
48 public FixedEmphasisDelimiterProcessor(boolean strongWrapsEmphasis) {
49 super(strongWrapsEmphasis);
50 this.multipleUse = strongWrapsEmphasis ? 1 : 2;
51 }
52
53 @SuppressWarnings("PMD.OnlyOneReturn") // for readability
54 @Override
55 public int getDelimiterUse(DelimiterRun opener, DelimiterRun closer) {
56 // "multiple of 3" rule for internal delimiter runs
57 if ((opener.canClose() || closer.canOpen()) && (opener.length() + closer.length()) % 3 == 0) {
58 if (opener.length() % 3 == 0 && closer.length() % 3 == 0) {
59 return this.multipleUse; // if they are each a multiple of 3, then emphasis can be created
60 }
61 return 0;
62 }
63
64 // calculate actual number of delimiters used from this closer
65 if (opener.length() < 3 || closer.length() < 3) {
66 return Utils.min(closer.length(), opener.length());
67 }
68 // default to latest spec
69 return closer.length() % 2 == 0 ? 2 : multipleUse;
70 }
71
72 @Override
73 public void process(Delimiter opener, Delimiter closer, int delimitersUsed) {
74 DelimitedNode emphasis = delimitersUsed == 1
75 ? new Emphasis(opener.getTailChars(delimitersUsed), BasedSequence.NULL, closer.getLeadChars(delimitersUsed))
76 : new StrongEmphasis(opener.getTailChars(delimitersUsed), BasedSequence.NULL,
77 closer.getLeadChars(delimitersUsed));
78
79 opener.moveNodesBetweenDelimitersTo(emphasis, closer);
80 }
81
82 }