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package org.pacien.pandoc.filter.plantuml;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.node.TextNode;
import net.sourceforge.plantuml.FileFormat;
import net.sourceforge.plantuml.FileFormatOption;
import net.sourceforge.plantuml.SourceStringReader;
import java.io.*;
import java.util.Iterator;
import java.util.stream.Collectors;
final public class Filter {
private static final String BEGIN_TAG = "\\begin{tikzpicture}[yscale=-1]";
private static final String LINE_SEP = "\n";
private static final String TYPE_KEY = "t";
private static final String CONTENT_KEY = "c";
private static final String CODE_BLOCK_TYPE = "CodeBlock";
private static final String RAW_BLOCK_TYPE = "RawBlock";
private static final String PLANTUML_TYPE = "puml";
private static final String LATEX_TYPE = "latex";
private static final int META_INDEX = 0;
private static final int META_PROP_INDEX = 1;
private static final int META_PROP_TYPE_INDEX = 0;
private static final int CONTENT_INDEX = 1;
private static String plantumlToLatex(String puml) throws IOException {
try (ByteArrayOutputStream s = new ByteArrayOutputStream()) {
new SourceStringReader(puml).generateImage(s, new FileFormatOption(FileFormat.LATEX_NO_PREAMBLE));
try (BufferedReader r = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(s.toByteArray())))) {
return BEGIN_TAG + LINE_SEP + r.lines().filter(l -> !l.equals(BEGIN_TAG)).collect(Collectors.joining(LINE_SEP));
}
}
}
private static void renderPlantumlNode(ObjectNode n) throws IOException {
String puml = n.get(CONTENT_KEY).get(CONTENT_INDEX).asText();
String tikz = plantumlToLatex(puml);
n.set(TYPE_KEY, TextNode.valueOf(RAW_BLOCK_TYPE));
((ArrayNode) n.get(CONTENT_KEY)).removeAll()
.add(TextNode.valueOf(LATEX_TYPE))
.add(TextNode.valueOf(tikz));
}
private static boolean isPlantumlNode(JsonNode n) {
return n.path(TYPE_KEY).asText().equals(CODE_BLOCK_TYPE) &&
n.path(CONTENT_KEY).path(META_INDEX).path(META_PROP_INDEX).path(META_PROP_TYPE_INDEX).asText().equals(PLANTUML_TYPE);
}
private static void walk(JsonNode n) throws IOException {
if (isPlantumlNode(n))
renderPlantumlNode((ObjectNode) n);
else if (n.isContainerNode())
for (Iterator<JsonNode> i = n.elements(); i.hasNext(); ) walk(i.next());
}
public static void filter(InputStream i, OutputStream o) throws IOException {
ObjectMapper m = new ObjectMapper();
JsonNode t = m.readTree(i);
if (t != null) {
walk(t);
m.writeValue(o, t);
}
}
public static void main(String args[]) {
try {
filter(System.in, System.out);
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
}
}
private Filter() {
// static class
}
}
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