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package org.zwobble.mammoth;
import com.google.common.collect.Iterables;
import org.zwobble.mammoth.documents.*;
import org.zwobble.mammoth.docx.*;
import org.zwobble.mammoth.html.Html;
import org.zwobble.mammoth.results.Result;
import org.zwobble.mammoth.util.Casts;
import org.zwobble.mammoth.util.MammothLists;
import org.zwobble.mammoth.xml.XmlElement;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Optional;
import java.util.zip.ZipFile;
import static org.zwobble.mammoth.util.MammothLists.list;
public class Mammoth {
public static class Options {
public static final Options DEFAULT = new Options("", false);
private final String idPrefix;
private final boolean preserveEmptyParagraphs;
public Options(String idPrefix, boolean preserveEmptyParagraphs) {
this.idPrefix = idPrefix;
this.preserveEmptyParagraphs = preserveEmptyParagraphs;
}
public Options idPrefix(String prefix) {
return new Options(prefix, preserveEmptyParagraphs);
}
public Options preserveEmptyParagraphs() {
return new Options(idPrefix, true);
}
}
@FunctionalInterface
private interface BodyReaders {
BodyXmlReader forName(String name);
}
public static Result<String> convertToHtml(File file) {
return convertToHtml(file, Options.DEFAULT);
}
public static Result<String> convertToHtml(File file, Options options) {
return readDocument(file, options)
.map(nodes -> DocumentConverter.convertToHtml(options.idPrefix, options.preserveEmptyParagraphs, nodes))
.map(Html::stripEmpty)
.map(Html::collapse)
.map(Html::write);
}
public static Result<String> extractRawText(File file) {
return readDocument(file, Options.DEFAULT)
.map(document -> extractRawTextOfChildren(document));
}
private static String extractRawTextOfChildren(HasChildren parent) {
return extractRawText(parent.getChildren());
}
private static String extractRawText(List<DocumentElement> nodes) {
return String.join("", Iterables.transform(nodes, node -> extractRawText(node)));
}
private static String extractRawText(DocumentElement node) {
return Casts.tryCast(Text.class, node)
.map(Text::getValue)
.orElseGet(() -> {
List<DocumentElement> children = Casts.tryCast(HasChildren.class, node)
.map(HasChildren::getChildren)
.orElse(list());
String suffix = node instanceof Paragraph ? "\n\n" : "";
return extractRawText(children) + suffix;
});
}
private static Result<Document> readDocument(File file, Options options) {
try (DocxFile zipFile = new ZippedDocxFile(new ZipFile(file))) {
Styles styles = readStyles(zipFile);
Numbering numbering = Numbering.EMPTY;
ContentTypes contentTypes = ContentTypes.DEFAULT;
FileReader fileReader = uri -> {
throw new UnsupportedOperationException();
};
BodyReaders bodyReaders = name -> {
Relationships relationships = readRelationships(zipFile, name);
return new BodyXmlReader(styles, numbering, relationships, contentTypes, zipFile, fileReader);
};
return readNotes(zipFile, bodyReaders)
.flatMap(notes -> {
DocumentXmlReader reader = new DocumentXmlReader(bodyReaders.forName("document"), notes);
return reader.readElement(parseOfficeXml(zipFile, "word/document.xml"));
});
} catch (IOException e) {
throw new UnsupportedOperationException("Should return a result of failure");
}
}
private static Result<Notes> readNotes(DocxFile file, BodyReaders bodyReaders) {
return Result.map(
tryParseOfficeXml(file, "word/footnotes.xml")
.map(NotesXmlReader.footnote(bodyReaders.forName("footnotes"))::readElement)
.orElse(Result.success(list())),
tryParseOfficeXml(file, "word/endnotes.xml")
.map(NotesXmlReader.endnote(bodyReaders.forName("endnotes"))::readElement)
.orElse(Result.success(list())),
MammothLists::concat).map(Notes::new);
}
private static Styles readStyles(DocxFile file) {
return tryParseOfficeXml(file, "word/styles.xml")
.map(StylesXml::readStylesXmlElement)
.orElse(Styles.EMPTY);
}
private static Relationships readRelationships(DocxFile zipFile, String name) {
return tryParseOfficeXml(zipFile, "word/_rels/" + name + ".xml.rels")
.map(RelationshipsXml::readRelationshipsXmlElement)
.orElse(Relationships.EMPTY);
}
private static Optional<XmlElement> tryParseOfficeXml(DocxFile zipFile, String name) {
try {
return zipFile.tryGetInputStream(name).map(OfficeXml::parseXml);
} catch (IOException exception) {
// TODO: wrap in more specific exception and catch at the top
throw new RuntimeException(exception);
}
}
private static XmlElement parseOfficeXml(DocxFile zipFile, String name) {
return tryParseOfficeXml(zipFile, name)
// TODO: wrap in more specific exception and catch at the top
.orElseThrow(() -> new RuntimeException(new IOException("Missing entry in file: " + name)));
}
}
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