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package org.zwobble.mammoth;
import com.google.common.collect.ImmutableMap;
import com.google.common.io.ByteStreams;
import org.zwobble.mammoth.documents.*;
import org.zwobble.mammoth.html.Html;
import org.zwobble.mammoth.html.HtmlNode;
import java.io.IOException;
import java.util.Base64;
import java.util.List;
import java.util.Map;
import static org.zwobble.mammoth.util.MammothLists.eagerFlatMap;
import static org.zwobble.mammoth.util.MammothLists.list;
import static org.zwobble.mammoth.util.MammothMaps.map;
public class DocumentConverter {
private final String idPrefix;
public DocumentConverter(String idPrefix) {
this.idPrefix = idPrefix;
}
public List<HtmlNode> convertToHtml(Document document) {
return convertChildrenToHtml(document);
}
private List<HtmlNode> convertChildrenToHtml(HasChildren element) {
return eagerFlatMap(
element.getChildren(),
this::convertToHtml);
}
public List<HtmlNode> convertToHtml(DocumentElement element) {
return element.accept(new DocumentElementVisitor<List<HtmlNode>>() {
@Override
public List<HtmlNode> visit(Paragraph paragraph) {
List<HtmlNode> content = convertChildrenToHtml(paragraph);
if (content.isEmpty()) {
return list();
} else {
return list(Html.element("p", content));
}
}
@Override
public List<HtmlNode> visit(Run run) {
List<HtmlNode> nodes = convertChildrenToHtml(run);
if (run.isStrikethrough()) {
nodes = list(Html.element("s", nodes));
}
if (run.getVerticalAlignment() == VerticalAlignment.SUBSCRIPT) {
nodes = list(Html.element("sub", nodes));
}
if (run.getVerticalAlignment() == VerticalAlignment.SUPERSCRIPT) {
nodes = list(Html.element("sup", nodes));
}
if (run.isItalic()) {
nodes = list(Html.element("em", nodes));
}
if (run.isBold()) {
nodes = list(Html.element("strong", nodes));
}
return nodes;
}
@Override
public List<HtmlNode> visit(Text text) {
if (text.getValue().isEmpty()) {
return list();
} else {
return list(Html.text(text.getValue()));
}
}
@Override
public List<HtmlNode> visit(Tab tab) {
return list(Html.text("\t"));
}
@Override
public List<HtmlNode> visit(LineBreak lineBreak) {
return list(Html.selfClosingElement("br"));
}
@Override
public List<HtmlNode> visit(Table table) {
return list(Html.element("table", convertChildrenToHtml(table)));
}
@Override
public List<HtmlNode> visit(TableRow tableRow) {
return list(Html.element("tr", convertChildrenToHtml(tableRow)));
}
@Override
public List<HtmlNode> visit(TableCell tableCell) {
return list(Html.element("td", convertChildrenToHtml(tableCell)));
}
@Override
public List<HtmlNode> visit(Hyperlink hyperlink) {
Map<String, String> attributes = map("href", generateHref(hyperlink));
return list(Html.element("a", attributes, convertChildrenToHtml(hyperlink)));
}
private String generateHref(Hyperlink hyperlink) {
if (hyperlink.getHref().isPresent()) {
return hyperlink.getHref().get();
} else if (hyperlink.getAnchor().isPresent()) {
return "#" + generateId(hyperlink.getAnchor().get());
} else {
return "";
}
}
@Override
public List<HtmlNode> visit(Bookmark bookmark) {
return list(Html.element("a", map("id", generateId(bookmark.getName()))));
}
private String generateId(String bookmarkName) {
return idPrefix + "-" + bookmarkName;
}
@Override
public List<HtmlNode> visit(NoteReference noteReference) {
throw new UnsupportedOperationException();
}
@Override
public List<HtmlNode> visit(Image image) {
// TODO: custom image handlers
// TODO: handle empty content type
return image.getContentType()
.map(contentType -> {
try {
ImmutableMap.Builder<String, String> attributes = ImmutableMap.builder();
String base64 = Base64.getEncoder().encodeToString(ByteStreams.toByteArray(image.open()));
String src = "data:" + contentType + ";base64," + base64;
attributes.put("src", src);
image.getAltText().ifPresent(altText -> attributes.put("alt", altText));
return list(Html.selfClosingElement("img", attributes.build()));
} catch (IOException exception) {
// TODO: return a result with a warning
throw new RuntimeException(exception);
}
})
.orElse(list());
}
});
}
}
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