Рефакторинг - вынес методы конвертирования в отдельные классы

server/core/BookConverter/ConvertBase.js

@@ -0,0 +1,96 @@
+const iconv = require('iconv-lite');
+const chardet = require('chardet');
+const textUtils = require('./textUtils');
+
+class ConvertBase {
+    constructor(config) {
+        this.config = config;
+    }
+
+    run(data, opts) {// eslint-disable-line no-unused-vars
+        //override
+    }
+
+    decode(data) {
+        let selected = textUtils.getEncoding(data);
+
+        if (selected == 'ISO-8859-5') {
+            const charsetAll = chardet.detectAll(data.slice(0, 20000));
+            for (const charset of charsetAll) {
+                if (charset.name.indexOf('ISO-8859') < 0) {
+                    selected = charset.name;
+                    break;
+                }
+            }
+        }
+
+        if (selected.toLowerCase() != 'utf-8')
+            return iconv.decode(data, selected);
+        else
+            return data;
+    }
+
+    repSpaces(text) {
+        return text.replace(/&nbsp;|[\t\n\r]/g, ' ');
+    }
+
+    formatFb2(fb2) {
+        let out = '<?xml version="1.0" encoding="utf-8"?>';
+        out += '<FictionBook xmlns="http://www.gribuser.ru/xml/fictionbook/2.0" xmlns:l="http://www.w3.org/1999/xlink">';
+        out += this.formatFb2Node(fb2);
+        out += '</FictionBook>';
+        return out;
+    }
+
+    formatFb2Node(node, name) {
+        let out = '';
+
+        if (Array.isArray(node)) {
+            for (const n of node) {
+                out += this.formatFb2Node(n);
+            }
+        } else if (typeof node == 'string') {
+            if (name)
+                out += `<${name}>${this.repSpaces(node)}</${name}>`;
+            else
+                out += this.repSpaces(node);
+        } else {
+            if (node._n)
+                name = node._n;
+
+            let attrs = '';
+            if (node._attrs) {
+                for (let attrName in node._attrs) {
+                    attrs += ` ${attrName}="${node._attrs[attrName]}"`;
+                }
+            }
+
+            let tOpen = '';
+            let tBody = '';
+            let tClose = '';
+            if (name)
+                tOpen += `<${name}${attrs}>`;
+            if (node.hasOwnProperty('_t'))
+                tBody += this.repSpaces(node._t);
+
+            for (let nodeName in node) {
+                if (nodeName && nodeName[0] == '_' && nodeName != '_a')
+                    continue;
+
+                const n = node[nodeName];
+                tBody += this.formatFb2Node(n, nodeName);
+            }
+            
+            if (name)
+                tClose += `</${name}>`;
+
+            if (attrs == '' && name == 'p' && tBody.trim() == '')
+                out += '<empty-line/>'
+            else
+                out += `${tOpen}${tBody}${tClose}`;
+        }
+        return out;
+    }
+}
+
+module.exports = ConvertBase;