315 lines
12 KiB
Java
315 lines
12 KiB
Java
package com.guo.learningprogresstracker.service.impl;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.guo.learningprogresstracker.enums.ReviewMindMapFileFormatEnum;
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import org.springframework.web.multipart.MultipartFile;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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import org.w3c.dom.NodeList;
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import javax.xml.parsers.DocumentBuilderFactory;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import java.util.ArrayDeque;
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import java.util.ArrayList;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipInputStream;
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class MindMapFileParser {
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private final ObjectMapper objectMapper;
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MindMapFileParser(ObjectMapper objectMapper) {
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this.objectMapper = objectMapper;
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}
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ParseResult parse(MultipartFile file, ReviewMindMapFileFormatEnum format) throws IOException {
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byte[] bytes = file.getBytes();
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Map<String, Object> root = switch (format) {
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case XMIND -> parseXMind(bytes);
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case MARKDOWN -> parseMarkdown(new String(bytes, StandardCharsets.UTF_8), format);
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case OPML -> parseOutlineXml(bytes, "text", format);
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case FREEMIND -> parseOutlineXml(bytes, "TEXT", format);
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case TEXT -> parseMarkdown(new String(bytes, StandardCharsets.UTF_8), format);
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};
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String title = String.valueOf(root.getOrDefault("title", file.getOriginalFilename()));
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String outline = toOutline(root);
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int nodeCount = countNodes(root);
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int depth = maxDepth(root);
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String summary = "共解析 " + nodeCount + " 个节点，最大层级 " + depth + "。";
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return new ParseResult(title, format.getCode(), objectMapper.writeValueAsString(root), outline, summary);
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}
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private Map<String, Object> parseXMind(byte[] bytes) throws IOException {
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byte[] contentJson = null;
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byte[] contentXml = null;
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try (ZipInputStream zipInputStream = new ZipInputStream(new ByteArrayInputStream(bytes))) {
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ZipEntry entry;
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while ((entry = zipInputStream.getNextEntry()) != null) {
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if ("content.json".equals(entry.getName())) {
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contentJson = zipInputStream.readAllBytes();
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} else if ("content.xml".equals(entry.getName())) {
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contentXml = zipInputStream.readAllBytes();
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}
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}
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}
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if (contentJson != null) {
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return parseXMindJson(contentJson);
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}
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if (contentXml != null) {
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return parseXMindXml(contentXml);
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}
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throw new IOException("未找到 XMind 内容文件");
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}
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private Map<String, Object> parseXMindJson(byte[] bytes) throws IOException {
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JsonNode sheets = objectMapper.readTree(bytes);
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JsonNode sheet = sheets.isArray() && !sheets.isEmpty() ? sheets.get(0) : sheets;
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JsonNode rootTopic = sheet.path("rootTopic");
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Map<String, Object> root = node(rootTopic.path("title").asText("XMind 导图"));
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root.put("sourceFormat", ReviewMindMapFileFormatEnum.XMIND.getCode());
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root.put("nodes", parseXMindTopicChildren(rootTopic));
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return root;
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}
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private List<Map<String, Object>> parseXMindTopicChildren(JsonNode topic) {
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List<Map<String, Object>> result = new ArrayList<>();
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JsonNode attached = topic.path("children").path("attached");
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if (!attached.isArray()) {
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return result;
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}
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for (JsonNode child : attached) {
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Map<String, Object> item = node(child.path("title").asText("未命名节点"));
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item.put("children", parseXMindTopicChildren(child));
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result.add(item);
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}
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return result;
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}
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private Map<String, Object> parseXMindXml(byte[] bytes) throws IOException {
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Document document = xmlDocument(bytes);
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Element sheet = firstElementByName(document.getDocumentElement(), "sheet");
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Element topic = sheet == null ? firstElementByName(document.getDocumentElement(), "topic") : firstElementByName(sheet, "topic");
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if (topic == null) {
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throw new IOException("未找到 XMind 根节点");
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}
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Map<String, Object> root = parseTopicElement(topic);
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root.put("sourceFormat", ReviewMindMapFileFormatEnum.XMIND.getCode());
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root.put("nodes", root.remove("children"));
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return root;
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}
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private Map<String, Object> parseMarkdown(String content, ReviewMindMapFileFormatEnum format) {
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Map<String, Object> root = node("导图大纲");
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root.put("sourceFormat", format.getCode());
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List<Map<String, Object>> roots = new ArrayList<>();
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root.put("nodes", roots);
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ArrayDeque<StackItem> stack = new ArrayDeque<>();
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stack.push(new StackItem(0, roots));
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for (String rawLine : content.split("\\R")) {
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String line = rawLine.stripTrailing();
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if (line.isBlank()) {
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continue;
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}
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int level = markdownLevel(line);
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String title = markdownTitle(line);
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Map<String, Object> item = node(title);
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while (stack.peek().level >= level) {
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stack.pop();
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}
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stack.peek().children.add(item);
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@SuppressWarnings("unchecked")
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List<Map<String, Object>> children = (List<Map<String, Object>>) item.get("children");
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stack.push(new StackItem(level, children));
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}
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if (!roots.isEmpty()) {
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root.put("title", roots.get(0).get("title"));
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}
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return root;
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}
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private Map<String, Object> parseOutlineXml(byte[] bytes, String titleAttribute, ReviewMindMapFileFormatEnum format) throws IOException {
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Document document = xmlDocument(bytes);
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Element rootElement = document.getDocumentElement();
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Element first = firstElementByName(rootElement, "outline");
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if (first == null) {
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first = firstElementByName(rootElement, "node");
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titleAttribute = "TEXT";
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}
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if (first == null) {
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throw new IOException("未找到导图节点");
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}
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Map<String, Object> root = parseOutlineElement(first, titleAttribute);
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root.put("sourceFormat", format.getCode());
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root.put("nodes", root.remove("children"));
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return root;
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}
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private Document xmlDocument(byte[] bytes) throws IOException {
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try {
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DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
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factory.setFeature("http://xml.org/sax/features/external-general-entities", false);
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factory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
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factory.setNamespaceAware(false);
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return factory.newDocumentBuilder().parse(new ByteArrayInputStream(bytes));
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} catch (Exception e) {
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throw new IOException("导图 XML 解析失败", e);
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}
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}
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private Map<String, Object> parseTopicElement(Element element) {
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Map<String, Object> item = node(textOfFirstChild(element, "title", "未命名节点"));
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item.put("children", childTopicElements(element).stream()
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.map(this::parseTopicElement)
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.toList());
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return item;
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}
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private Map<String, Object> parseOutlineElement(Element element, String titleAttribute) {
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String title = element.getAttribute(titleAttribute);
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if (title == null || title.isBlank()) {
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title = element.getAttribute("text");
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}
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if (title == null || title.isBlank()) {
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title = "未命名节点";
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}
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Map<String, Object> item = node(title);
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List<Map<String, Object>> children = directChildElements(element).stream()
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.filter(child -> "outline".equalsIgnoreCase(child.getTagName()) || "node".equalsIgnoreCase(child.getTagName()))
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.map(child -> parseOutlineElement(child, titleAttribute))
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.toList();
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item.put("children", children);
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return item;
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}
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private Map<String, Object> node(String title) {
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Map<String, Object> node = new LinkedHashMap<>();
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node.put("title", title);
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node.put("notes", "");
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node.put("children", new ArrayList<Map<String, Object>>());
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return node;
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}
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private int markdownLevel(String line) {
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String trimmed = line.stripLeading();
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if (trimmed.startsWith("#")) {
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int count = 0;
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while (count < trimmed.length() && trimmed.charAt(count) == '#') {
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count++;
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}
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return count;
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}
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int indent = line.length() - trimmed.length();
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return 1 + indent / 2;
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}
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private String markdownTitle(String line) {
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return line.strip()
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.replaceFirst("^#{1,6}\\s*", "")
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.replaceFirst("^[-*+]\\s*", "")
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.replaceFirst("^\\d+\\.\\s*", "");
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}
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private List<Element> childTopicElements(Element element) {
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return directChildElements(element).stream()
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.flatMap(child -> {
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if ("topic".equalsIgnoreCase(child.getTagName())) {
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return List.of(child).stream();
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}
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return childTopicElements(child).stream();
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})
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.toList();
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}
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private Element firstElementByName(Element element, String name) {
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if (name.equalsIgnoreCase(element.getTagName())) {
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return element;
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}
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NodeList nodes = element.getChildNodes();
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for (int i = 0; i < nodes.getLength(); i++) {
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if (nodes.item(i) instanceof Element child) {
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Element found = firstElementByName(child, name);
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if (found != null) {
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return found;
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}
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}
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}
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return null;
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}
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private List<Element> directChildElements(Element element) {
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List<Element> result = new ArrayList<>();
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NodeList nodes = element.getChildNodes();
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for (int i = 0; i < nodes.getLength(); i++) {
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if (nodes.item(i) instanceof Element child) {
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result.add(child);
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}
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}
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return result;
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}
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private String textOfFirstChild(Element element, String name, String fallback) {
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for (Element child : directChildElements(element)) {
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if (name.equalsIgnoreCase(child.getTagName())) {
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return child.getTextContent();
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}
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}
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return fallback;
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}
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private String toOutline(Map<String, Object> root) {
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StringBuilder builder = new StringBuilder();
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appendOutline(builder, root, 0);
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return builder.toString();
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}
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@SuppressWarnings("unchecked")
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private void appendOutline(StringBuilder builder, Map<String, Object> node, int level) {
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builder.append(" ".repeat(level)).append("- ").append(node.get("title")).append('\n');
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Object children = node.get(level == 0 && node.containsKey("nodes") ? "nodes" : "children");
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if (children instanceof List<?> list) {
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for (Object child : list) {
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appendOutline(builder, (Map<String, Object>) child, level + 1);
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}
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}
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}
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@SuppressWarnings("unchecked")
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private int countNodes(Map<String, Object> node) {
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int count = 1;
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Object children = node.get(node.containsKey("nodes") ? "nodes" : "children");
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if (children instanceof List<?> list) {
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for (Object child : list) {
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count += countNodes((Map<String, Object>) child);
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}
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}
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return count;
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}
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@SuppressWarnings("unchecked")
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private int maxDepth(Map<String, Object> node) {
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Object children = node.get(node.containsKey("nodes") ? "nodes" : "children");
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if (!(children instanceof List<?> list) || list.isEmpty()) {
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return 1;
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}
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int max = 1;
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for (Object child : list) {
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max = Math.max(max, 1 + maxDepth((Map<String, Object>) child));
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}
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return max;
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}
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record ParseResult(String title, String fileFormat, String parsedContent, String outline, String summary) {
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}
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private record StackItem(int level, List<Map<String, Object>> children) {
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}
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}
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