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Bypass AST model -> HTML Conversion for Markdown Comments
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- For JEP 467, JDT parses the markdown comments into the AST Model as a
  Javadoc node (TagElement & TextElement and Name/MemberRef/MethodRef
  for links), converting to HTML. JDT-LS converts the HTML back to
  Markdown using Remark.
- This bypasses the AST model -> HTML conversion by attempting to render
  the Javadoc comments directly as Markdown, in part because the content
  is already (mostly) Markdown

Signed-off-by: Roland Grunberg <[email protected]>
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@rgrunber
rgrunber committed Dec 10, 2024
1 parent 64cc830 commit a6495a4
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Showing 2 changed files with 187 additions and 11 deletions.
188 changes: 183 additions & 5 deletions ...lipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/javadoc/JavadocContentAccess2.java
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Original file line number Diff line number Diff line change
Expand Up @@ -15,20 +15,33 @@

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Deque;
import java.util.LinkedList;
import java.util.List;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.IBuffer;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaModelStatusConstants;
import org.eclipse.jdt.core.ILocalVariable;
import org.eclipse.jdt.core.IMember;
import org.eclipse.jdt.core.IMethod;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.ISourceRange;
import org.eclipse.jdt.core.ITypeParameter;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.Javadoc;
import org.eclipse.jdt.core.dom.MemberRef;
import org.eclipse.jdt.core.dom.MethodRef;
import org.eclipse.jdt.core.dom.MethodRefParameter;
import org.eclipse.jdt.core.dom.Name;
import org.eclipse.jdt.core.dom.SimpleName;
import org.eclipse.jdt.core.dom.TagElement;
import org.eclipse.jdt.core.dom.TextElement;
import org.eclipse.jdt.core.manipulation.internal.javadoc.CoreJavaDocSnippetStringEvaluator;
Expand All @@ -38,6 +51,8 @@
import org.eclipse.jdt.core.manipulation.internal.javadoc.CoreMarkdownAccessImpl;
import org.eclipse.jdt.core.manipulation.internal.javadoc.IJavadocContentFactory;
import org.eclipse.jdt.core.manipulation.internal.javadoc.JavadocLookup;
import org.eclipse.jdt.internal.core.manipulation.JavaManipulationPlugin;
import org.eclipse.jdt.internal.corext.dom.ASTNodes;
import org.eclipse.jdt.internal.ui.viewsupport.CoreJavaElementLinks;
import org.eclipse.jdt.ls.core.internal.JDTUtils;
import org.eclipse.jdt.ls.core.internal.JavaLanguageServerPlugin;
Expand Down Expand Up @@ -70,18 +85,152 @@ public static Reader getPlainTextContentReader(IMember member) throws JavaModelE

public static Reader getMarkdownContentReader(IJavaElement element) {

CoreJavadocAccess access = createJdtLsJavadocAccess();
try {
CoreJavadocAccess access = createJdtLsJavadocAccess();
String rawHtml = access.getHTMLContent(element, true);
Reader markdownReader = new JavaDoc2MarkdownConverter(rawHtml).getAsReader();
return markdownReader;
String content = getJavaDocNode(element);
if (content != null && content.startsWith("///")) {
Javadoc node = CoreJavadocContentAccessUtility.getJavadocNode(element, content);
StringBuilder buf = new StringBuilder();
for (Object tag : node.tags()) {
buf.append("\n");
collectTagElements(content, element, (TagElement) tag, buf);
}
return buf.length() > 0 ? new StringReader(buf.substring(1)) : new StringReader(content);
} else {
String rawHtml = access.getHTMLContent(element, true);
Reader markdownReader = new JavaDoc2MarkdownConverter(rawHtml).getAsReader();
return markdownReader;
}
} catch (IOException | CoreException e) {

}

return null;
}

private static void collectTagElements(String content, IJavaElement element, TagElement tag, StringBuilder buf) {
if (tag.getTagName() != null) {
String heading = switch (tag.getTagName()) {
case TagElement.TAG_API_NOTE -> "API Note:";
case TagElement.TAG_AUTHOR -> "Author:";
case TagElement.TAG_IMPL_SPEC -> "Impl Spec:";
case TagElement.TAG_IMPL_NOTE -> "Impl Note:";
case TagElement.TAG_PARAM -> "Parameters:";
case TagElement.TAG_PROVIDES -> "Provides:";
case TagElement.TAG_RETURN -> "Returns:";
case TagElement.TAG_THROWS -> "Throws:";
case TagElement.TAG_EXCEPTION -> "Throws:";
case TagElement.TAG_SINCE -> "Since:";
case TagElement.TAG_SEE -> "See:";
case TagElement.TAG_VERSION -> "See:";
case TagElement.TAG_USES -> "Uses:";
default -> "";
};
buf.append("* **" + heading + "**");
buf.append("\n");
buf.append(" * ");
}
Deque<ASTNode> queue = new LinkedList<>();
queue.addAll(tag.fragments());
while (!queue.isEmpty()) {
ASTNode e = queue.pop();
if (e instanceof TagElement t) {
if ("@link".equals(t.getTagName()) || "@linkplain".equals(t.getTagName())) {
collectLinkedTag(element, t, buf);
} else {
collectTagElements(content, element, t, buf);
}
} else if (e instanceof TextElement) {
buf.append(((TextElement) e).getText());
} else if ("@see".equals(tag.getTagName())) {
collectLinkedTag(element, tag, buf);
} else {
}

ASTNode next = queue.peek();
if (next != null) {
int currEnd = e.getStartPosition() + e.getLength();
int nextStart = next.getStartPosition();
if (currEnd != nextStart) {
if (content.substring(currEnd, nextStart).split("///").length > 2) {
buf.append(" \n");
} else {
buf.append("\n");
}
} else {
buf.append(" ");
}
}
}
}

private static void collectLinkedTag(IJavaElement element, TagElement t, StringBuilder buf) {
List children = t.fragments();
if (t.fragments().size() > 0) {
try {
String[] res;
String linkTitle;
if (t.fragments().size() == 2) {
linkTitle = ((TextElement) t.fragments().get(0)).getText();
res = collectLinkElement((ASTNode) children.get(1));
} else {
res = collectLinkElement((ASTNode) children.get(0));
linkTitle = res[0];
}
buf.append("[" + linkTitle + "]");
String uri = JdtLsJavadocAccessImpl.createLinkURIHelper(CoreJavaElementLinks.JAVADOC_SCHEME, element, res[0], res.length > 1 ? res[1] : null,
res.length > 2 ? Arrays.asList(res).subList(2, res.length).toArray(new String[0]) : null);
buf.append("(" + uri + ")");
} catch (URISyntaxException ex) {
JavaManipulationPlugin.log(ex);
}
}
}

private static String[] collectLinkElement(ASTNode e) {
String refTypeName = null;
String refMemberName = null;
String[] refMethodParamTypes = null;
String[] refMethodParamNames = null;
if (e instanceof Name) {
Name name = (Name) e;
refTypeName = name.getFullyQualifiedName();
} else if (e instanceof MemberRef) {
MemberRef memberRef = (MemberRef) e;
Name qualifier = memberRef.getQualifier();
refTypeName = qualifier == null ? "" : qualifier.getFullyQualifiedName(); //$NON-NLS-1$
refMemberName = memberRef.getName().getIdentifier();
} else if (e instanceof MethodRef) {
MethodRef methodRef = (MethodRef) e;
Name qualifier = methodRef.getQualifier();
refTypeName = qualifier == null ? "" : qualifier.getFullyQualifiedName(); //$NON-NLS-1$
refMemberName = methodRef.getName().getIdentifier();
List<MethodRefParameter> params = methodRef.parameters();
int ps = params.size();
refMethodParamTypes = new String[ps];
refMethodParamNames = new String[ps];
for (int i = 0; i < ps; i++) {
MethodRefParameter param = params.get(i);
refMethodParamTypes[i] = ASTNodes.asString(param.getType());
SimpleName paramName = param.getName();
if (paramName != null) {
refMethodParamNames[i] = paramName.getIdentifier();
}
}
} else if (e instanceof TextElement) {
refTypeName = ((TextElement) e).getText();
}
List<String> result = new ArrayList<>();
result.add(refTypeName);
if (refMemberName != null) {
result.add(refMemberName);
}
if (refMethodParamTypes != null) {
result.addAll(Arrays.asList(refMethodParamTypes));
}
return result.toArray(new String[0]);
}

/**
* @return
*/
Expand Down Expand Up @@ -139,6 +288,31 @@ public IJavadocAccess createJavadocAccess(IJavaElement element, Javadoc javadoc,
}
};

public static String getJavaDocNode(IJavaElement element) throws JavaModelException {
IMember member;
if (element instanceof ILocalVariable) {
member = ((ILocalVariable) element).getDeclaringMember();
} else if (element instanceof ITypeParameter) {
member = ((ITypeParameter) element).getDeclaringMember();
} else if (element instanceof IMember) {
member = (IMember) element;
} else {
return null;
}

IBuffer buf = member.getOpenable().getBuffer();
if (buf == null) {
return null; // no source attachment found
}

ISourceRange javadocRange = member.getJavadocRange();
if (javadocRange == null) {
return null;
}
String rawJavadoc = buf.getText(javadocRange.getOffset(), javadocRange.getLength());
return rawJavadoc;
}

private static class JdtLsJavadocAccessImpl extends CoreJavadocAccessImpl {

/**
Expand Down Expand Up @@ -323,7 +497,11 @@ protected String markSnippet(String text, boolean isInSnippet) {

@Override
protected String createLinkURI(String scheme, IJavaElement element, String refTypeName, String refMemberName, String[] refParameterTypes) throws URISyntaxException {
URI javadocURI = CoreJavaElementLinks.createURIAsUri(scheme, fElement, refTypeName, refMemberName, refParameterTypes);
return createLinkURIHelper(scheme, fElement, refTypeName, refMemberName, refParameterTypes);
}

public static String createLinkURIHelper(String scheme, IJavaElement element, String refTypeName, String refMemberName, String[] refParameterTypes) throws URISyntaxException {
URI javadocURI = CoreJavaElementLinks.createURIAsUri(scheme, element, refTypeName, refMemberName, refParameterTypes);
IJavaElement linkTarget = CoreJavaElementLinks.parseURI(javadocURI);
if (linkTarget == null) {
return "";
Expand Down
10 changes: 4 additions & 6 deletions org.eclipse.jdt.ls.tests/src/org/eclipse/jdt/ls/core/internal/handlers/HoverHandlerTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -780,12 +780,10 @@ public void testHoverMarkdownComment() throws Exception {
assertEquals(2, hover.getContents().getLeft().size());

//@formatter:off
String expectedJavadoc = "## TestClass ##\n"
+ "\n"
+ "Paragraph\n"
+ "\n"
+ " * item 1\n"
+ " * *item 2*";
String expectedJavadoc = "## TestClass \n"
+ "Paragraph \n"
+ "- item 1\n"
+ "- _item 2_";
//@formatter:on
String actual = hover.getContents().getLeft().get(1).getLeft();
actual = ResourceUtils.dos2Unix(actual);
Expand Down

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