/
HtmlToXmlJavadocLexer.java
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/
HtmlToXmlJavadocLexer.java
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/*
* Copyright 2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package gradlebuild.docs.dsl.docbook;
import java.util.*;
/**
* Normalises and cleans up HTML to convert it to XML semantics.
*/
public class HtmlToXmlJavadocLexer implements JavadocLexer {
private final JavadocLexer lexer;
private final Set<String> blockElements = new HashSet<String>();
private final Set<String> blockContent = new HashSet<String>();
public HtmlToXmlJavadocLexer(JavadocLexer lexer) {
this.lexer = lexer;
blockElements.add("p");
blockElements.add("pre");
blockElements.add("ul");
blockElements.add("ol");
blockElements.add("li");
blockElements.add("h1");
blockElements.add("h2");
blockElements.add("h3");
blockElements.add("h4");
blockElements.add("h5");
blockElements.add("h6");
blockElements.add("table");
blockElements.add("thead");
blockElements.add("tbody");
blockElements.add("tr");
blockElements.add("dl");
blockElements.add("dt");
blockElements.add("dd");
blockContent.add("ul");
blockContent.add("ol");
blockContent.add("table");
blockContent.add("thead");
blockContent.add("tbody");
blockContent.add("tr");
blockContent.add("dl");
}
@Override
public void visit(TokenVisitor visitor) {
lexer.visit(new VisitorImpl(visitor));
}
private class VisitorImpl extends TokenVisitor {
private final TokenVisitor visitor;
private final LinkedList<String> elementStack = new LinkedList<String>();
private final Map<String, String> attributes = new HashMap<String, String>();
public VisitorImpl(TokenVisitor visitor) {
this.visitor = visitor;
}
private void unwindTo(String element, TokenVisitor visitor) {
if (elementStack.contains(element)) {
while (!elementStack.getFirst().equals(element)) {
visitor.onEndHtmlElement(elementStack.removeFirst());
}
elementStack.removeFirst();
visitor.onEndHtmlElement(element);
}
}
private void unwindTo(Collection<String> ancestors, TokenVisitor visitor) {
for (int i = 0; i < elementStack.size(); i++) {
if (ancestors.contains(elementStack.get(i))) {
for (; i > 0; i--) {
visitor.onEndHtmlElement(elementStack.removeFirst());
}
break;
}
}
}
@Override
public void onStartHtmlElement(String name) {
attributes.clear();
}
@Override
public void onHtmlElementAttribute(String name, String value) {
attributes.put(name, value);
}
@Override
public void onStartHtmlElementComplete(String name) {
if (name.equals("li")) {
unwindTo(Arrays.asList("ul", "ol"), visitor);
} else if (name.equals("dt") || name.endsWith("dd")) {
unwindTo(Arrays.asList("dl"), visitor);
} else if (name.equals("tr")) {
unwindTo(Arrays.asList("table", "thead", "tbody"), visitor);
} else if (name.equals("th") || name.endsWith("td")) {
unwindTo(Arrays.asList("tr", "table", "thead", "tbody"), visitor);
} else if (blockElements.contains(name)) {
unwindTo("p", visitor);
} else if (!blockContent.contains(name) && !(name.equals("a") && attributes.containsKey("name"))) {
onInlineContent();
}
elementStack.addFirst(name);
visitor.onStartHtmlElement(name);
for (Map.Entry<String, String> entry : attributes.entrySet()) {
visitor.onHtmlElementAttribute(entry.getKey(), entry.getValue());
}
attributes.clear();
visitor.onStartHtmlElementComplete(name);
}
@Override
public void onEndHtmlElement(String name) {
unwindTo(name, visitor);
}
private void onInlineContent() {
if (elementStack.isEmpty() || blockContent.contains(elementStack.getFirst())) {
elementStack.addFirst("p");
visitor.onStartHtmlElement("p");
visitor.onStartHtmlElementComplete("p");
}
}
@Override
public void onStartJavadocTag(String name) {
onInlineContent();
visitor.onStartJavadocTag(name);
}
@Override
public void onEndJavadocTag(String name) {
onInlineContent();
visitor.onEndJavadocTag(name);
}
@Override
public void onText(String text) {
boolean ws = text.matches("\\s*");
if (!ws) {
onInlineContent();
visitor.onText(text);
} else if (!elementStack.isEmpty() && !blockContent.contains(elementStack.getFirst())) {
visitor.onText(text);
}
}
@Override
void onEnd() {
while (!elementStack.isEmpty()) {
visitor.onEndHtmlElement(elementStack.removeFirst());
}
visitor.onEnd();
}
}
}