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package org.zwobble.mammoth.internal.html;
import org.zwobble.mammoth.internal.util.MammothLists;
import org.zwobble.mammoth.internal.util.MammothOptionals;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import static org.zwobble.mammoth.internal.util.Casts.tryCast;
import static org.zwobble.mammoth.internal.util.MammothLists.list;
import static org.zwobble.mammoth.internal.util.MammothLists.tryGetLast;
import static org.zwobble.mammoth.internal.util.MammothMaps.map;
public class Html {
public static final HtmlNode FORCE_WRITE = HtmlForceWrite.FORCE_WRITE;
public static String write(List<HtmlNode> nodes) {
StringBuilder builder = new StringBuilder();
nodes.forEach(node -> HtmlWriter.write(node, builder));
return builder.toString();
}
public static HtmlNode text(String value) {
return new HtmlTextNode(value);
}
public static HtmlNode element(String tagName) {
return element(tagName, list());
}
public static HtmlNode element(String tagName, Map<String, String> attributes) {
return element(tagName, attributes, list());
}
public static HtmlNode element(String tagName, List<HtmlNode> children) {
return element(tagName, map(), children);
}
public static HtmlNode element(String tagName, Map<String, String> attributes, List<HtmlNode> children) {
return new HtmlElement(list(tagName), attributes, children, false);
}
public static HtmlNode collapsibleElement(String tagName) {
return collapsibleElement(list(tagName));
}
public static HtmlNode collapsibleElement(List<String> tagNames) {
return collapsibleElement(tagNames, map(), list());
}
public static HtmlNode collapsibleElement(String tagName, List<HtmlNode> children) {
return collapsibleElement(tagName, map(), children);
}
public static HtmlNode collapsibleElement(String tagName, Map<String, String> attributes, List<HtmlNode> children) {
return collapsibleElement(list(tagName), attributes, children);
}
public static HtmlNode collapsibleElement(List<String> tagNames, Map<String, String> attributes, List<HtmlNode> children) {
return new HtmlElement(tagNames, attributes, children, true);
}
public static HtmlNode selfClosingElement(String tagName) {
return selfClosingElement(tagName, map());
}
public static HtmlNode selfClosingElement(String tagName, Map<String, String> attributes) {
return new HtmlSelfClosingElement(tagName, attributes);
}
public static List<HtmlNode> stripEmpty(List<HtmlNode> nodes) {
return MammothLists.eagerFlatMap(nodes, node -> stripEmpty(node));
}
private static List<HtmlNode> stripEmpty(HtmlNode node) {
return node.accept(new HtmlNode.Mapper<List<HtmlNode>>() {
@Override
public List<HtmlNode> visit(HtmlElement element) {
List<HtmlNode> children = stripEmpty(element.getChildren());
if (children.isEmpty()) {
return list();
} else {
return list(new HtmlElement(
element.getTagNames(),
element.getAttributes(),
children,
element.isCollapsible()));
}
}
@Override
public List<HtmlNode> visit(HtmlSelfClosingElement element) {
return list(element);
}
@Override
public List<HtmlNode> visit(HtmlTextNode node) {
if (node.getValue().isEmpty()) {
return list();
} else {
return list(node);
}
}
@Override
public List<HtmlNode> visit(HtmlForceWrite forceWrite) {
return list(forceWrite);
}
});
}
public static List<HtmlNode> collapse(List<HtmlNode> nodes) {
List<HtmlNode> collapsed = new ArrayList<>();
for (HtmlNode node : nodes) {
collapsingAdd(collapsed, node);
}
return collapsed;
}
private static void collapsingAdd(List<HtmlNode> collapsed, HtmlNode node) {
HtmlNode collapsedNode = collapse(node);
if (!tryCollapse(collapsed, collapsedNode)) {
collapsed.add(collapsedNode);
}
}
private static HtmlNode collapse(HtmlNode node) {
return node.accept(new HtmlNode.Mapper<HtmlNode>() {
@Override
public HtmlNode visit(HtmlElement element) {
return new HtmlElement(
element.getTagNames(),
element.getAttributes(),
collapse(element.getChildren()),
element.isCollapsible());
}
@Override
public HtmlNode visit(HtmlSelfClosingElement element) {
return element;
}
@Override
public HtmlNode visit(HtmlTextNode node) {
return node;
}
@Override
public HtmlNode visit(HtmlForceWrite forceWrite) {
return forceWrite;
}
});
}
private static boolean tryCollapse(List<HtmlNode> collapsed, HtmlNode node) {
return MammothOptionals.map(
tryGetLast(collapsed).flatMap(last -> tryCast(HtmlElement.class, last)),
tryCast(HtmlElement.class, node),
(last, next) -> {
if (next.isCollapsible() && isMatch(last, next)) {
for (HtmlNode child : next.getChildren()) {
collapsingAdd(last.getChildren(), child);
}
return true;
} else {
return false;
}
}
).orElse(false);
}
private static boolean isMatch(HtmlElement first, HtmlElement second) {
return second.getTagNames().contains(first.getTagName()) &&
first.getAttributes().equals(second.getAttributes());
}
}
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