node.js 使用 elementtree 生成思维导图 Freemind 文件

请参阅: java : pdfbox 读取 PDF文件内书签

请注意：书的目录.txt 编码：UTF-8，推荐用 Notepad++ 转换编码。

npm install elementtree --save

编写 txt_etree_mm.js 如下

// 读目录.txt文件，使用 elementtree 生成思维导图 Freemind（.mm）文件
let fs = require('fs');
let process = require('process');
let path = require('path');
let readline = require('readline');
let et = require('elementtree');
let XML = et.XML;
let ElementTree = et.ElementTree;
//  element = et.Element;
let subElement = et.SubElement;

if (process.argv.length <3){
    console.error("usage: node txt_etree.mm.js file1.txt");
    return 1;
}
let file1 = process.argv[2];
if (! fs.statSync(file1).isFile()) {
    console.error("it is not File.");
    return 2;
}
let ext = path.extname(file1);
if (ext.toLowerCase() != '.txt'){
    console.error(ext +" is not .txt");
    return 3;
}
let file2 = file1.replace('.txt', '.mm');
console.log(file2);
let fRead = fs.createReadStream(file1);
let fWrite = fs.createWriteStream(file2);
// 创建readline接口实例
let rline = readline.createInterface({
    input: fRead,
//  output: fWrite,
    terminal: true
});
var txt, map1, root, edge, p_node, node1, node2, node3, node4, node5;
// 创建 map节点
map1 = et.Element('map');
map1.set('version', '1.0.1');

// 用缩排表现层级关系，假设最多5个层级
const indent1 ="  ";
const indent2 ="    ";
const indent3 ="      ";
const indent4 ="        ";

// line 事件
let n =1;
rline.on('line', function(line){
    txt = line.trim();
    if (n ==1){
        // 读取第一行：书名
        // 创建主题节点
        root = subElement(map1, "node");
        root.set('ID', '1');
        root.set('STYLE', 'bubble'); // 泡框
        root.set('TEXT', txt);
        // 定义连线的颜色：红色
        edge = subElement(root, "edge")
        edge.set('COLOR', "#ff0000")
    }
    txt = txt.slice(0,-3); // 去掉行尾的页数
    if (txt.length ==0 || n==1){ ;}
    else if (txt.length >0 && line.slice(0,1) !=' '){
        // 创建主题的子节点（1级节点）
        node1 = subElement(root, "node");
        node1.set('ID', String(n));
        node1.set('POSITION', "right");
        node1.set('TEXT', txt);
        p_node = node1; // 寄存父节点
    }
    else if (line.startsWith(indent1) && line.slice(2,3) !=' '){
        // 创建node1的子节点（2级节点）
        if (node1) node2 = subElement(node1, "node");
        else node2 = subElement(root, "node");
        node2.set('ID', String(n));
        node2.set('TEXT', txt);
        p_node = node2;
    }
    else if (line.startsWith(indent2) && line.slice(4,5) !=' '){    
        // 创建node2的子节点（3级节点）
        if (node2) node3 = subElement(node2, "node");
        else if(node1) node3 = subElement(node1, "node");
        else node3 = subElement(root, "node");
        node3.set('FOLDED', "true");
        node3.set('ID', String(n));
        node3.set('TEXT', txt);
        p_node = node3;
    }
    else if (line.startsWith(indent3) && line.slice(6,7) !=' '){
        // 创建node3的子节点（4级节点）
        if (node3) node4 = subElement(node3, "node");
        else if (node2) node4 = subElement(node2, "node");
        else if (node1) node4 = subElement(node1, "node");
        else node4 = subElement(root, "node");
        node4.set('ID', String(n));
        node4.set('TEXT', txt);
        p_node = node4;
    }
    else if (line.startsWith(indent4) && line.slice(8,9) !=' '){
        // 创建node4的子节点（5级节点）
        if (node4) node5 = subElement(node4, "node");
        else if (p_node) node5 = subElement(p_node, "node");
        else node5 = subElement(root, "node");
        node5.set('ID', String(n));
        node5.set('TEXT', txt);
    }
    else {
        console.log(txt);
    }
    n++;
});
var etree, xml;
rline.on('close', function(){
    etree = new ElementTree(map1);
    xml = etree.write({'xml_declaration': false});
    //console.log(xml);
    fWrite.write(xml);
    console.log("line number: "+n);
});

运行 node txt_etree.mm.js your_pdf_dir.txt