@lobehub/ui/es/hooks/useMermaid.js

Lobe UI is an open-source UI component library for building AIGC web apps

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function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }
function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }
function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; }
function _iterableToArrayLimit(r, l) { var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (null != t) { var e, n, i, u, a = [], f = !0, o = !1; try { if (i = (t = t.call(r)).next, 0 === l) { if (Object(t) !== t) return; f = !1; } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0); } catch (r) { o = !0, n = r; } finally { try { if (!f && null != t.return && (u = t.return(), Object(u) !== u)) return; } finally { if (o) throw n; } } return a; } }
function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
import { useTheme } from 'antd-style';
import { useEffect, useMemo, useState } from 'react';
import useSWR from 'swr';
import { Md5 } from 'ts-md5';

// 缓存已验证的图表内容
var mermaidCache = new Map();
var MD5_LENGTH_THRESHOLD = 10000;

// 懒加载 mermaid 实例
var loadMermaid = function loadMermaid() {
  if (typeof window === 'undefined') return Promise.resolve(null);
  return import('mermaid').then(function (mod) {
    return mod.default;
  });
};
var mermaidPromise = loadMermaid();

/**
 * 验证并处理 Mermaid 图表内容
 */
export var useMermaid = function useMermaid(id, content) {
  // 用于存储最近一次有效的内容
  var _useState = useState(''),
    _useState2 = _slicedToArray(_useState, 2),
    validContent = _useState2[0],
    setValidContent = _useState2[1];

  // 为长内容生成哈希键
  var cacheKey = useMemo(function () {
    var hash = content.length < MD5_LENGTH_THRESHOLD ? content : Md5.hashStr(content);
    return "mermaid-".concat(id, "-").concat(hash);
  }, [content, id]);
  return useSWR(cacheKey, /*#__PURE__*/_asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee() {
    var mermaidInstance, isValid, _yield$mermaidInstanc, svg;
    return _regeneratorRuntime().wrap(function _callee$(_context) {
      while (1) switch (_context.prev = _context.next) {
        case 0:
          if (!mermaidCache.has(cacheKey)) {
            _context.next = 2;
            break;
          }
          return _context.abrupt("return", validContent);
        case 2:
          _context.prev = 2;
          _context.next = 5;
          return mermaidPromise;
        case 5:
          mermaidInstance = _context.sent;
          if (mermaidInstance) {
            _context.next = 8;
            break;
          }
          return _context.abrupt("return", content);
        case 8:
          _context.next = 10;
          return mermaidInstance.parse(content);
        case 10:
          isValid = _context.sent;
          if (!isValid) {
            _context.next = 21;
            break;
          }
          _context.next = 14;
          return mermaidInstance.render(id, content);
        case 14:
          _yield$mermaidInstanc = _context.sent;
          svg = _yield$mermaidInstanc.svg;
          setValidContent(svg);
          // 缓存验证结果
          mermaidCache.set(cacheKey, true);
          return _context.abrupt("return", svg);
        case 21:
          throw new Error('Mermaid 语法无效');
        case 22:
          _context.next = 28;
          break;
        case 24:
          _context.prev = 24;
          _context.t0 = _context["catch"](2);
          console.error('Mermaid 解析错误:', _context.t0);
          // 返回最近一次有效的内容，或空字符串
          return _context.abrupt("return", validContent || '');
        case 28:
        case "end":
          return _context.stop();
      }
    }, _callee, null, [[2, 24]]);
  })), {
    dedupingInterval: 3000,
    errorRetryCount: 2,
    revalidateOnFocus: false,
    revalidateOnReconnect: false
  });
};

/**
 * 初始化 Mermaid 配置
 */
export var useMermaidInit = function useMermaidInit() {
  var theme = useTheme();

  // 提取主题相关配置到 useMemo 中
  var mermaidConfig = useMemo(function () {
    return {
      fontFamily: theme.fontFamilyCode,
      gantt: {
        useWidth: 1920
      },
      securityLevel: 'loose',
      startOnLoad: false,
      theme: theme.isDarkMode ? 'dark' : 'neutral',
      themeVariables: {
        errorBkgColor: theme.colorTextDescription,
        errorTextColor: theme.colorTextDescription,
        fontFamily: theme.fontFamily,
        fontSize: 14,
        lineColor: theme.colorTextSecondary,
        mainBkg: theme.colorBgContainer,
        noteBkgColor: theme.colorInfoBg,
        noteTextColor: theme.colorInfoText,
        pie1: theme.geekblue,
        pie2: theme.colorWarning,
        pie3: theme.colorSuccess,
        pie4: theme.colorError,
        primaryBorderColor: theme.colorBorder,
        primaryColor: theme.colorBgContainer,
        primaryTextColor: theme.colorText,
        secondaryBorderColor: theme.colorInfoBorder,
        secondaryColor: theme.colorInfoBg,
        secondaryTextColor: theme.colorInfoText,
        tertiaryBorderColor: theme.colorSuccessBorder,
        tertiaryColor: theme.colorSuccessBg,
        tertiaryTextColor: theme.colorSuccessText,
        textColor: theme.colorText
      }
    };
  }, [theme.isDarkMode]);

  // 初始化 mermaid 配置
  useEffect(function () {
    var initMermaid = /*#__PURE__*/function () {
      var _ref2 = _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee2() {
        var mermaidInstance;
        return _regeneratorRuntime().wrap(function _callee2$(_context2) {
          while (1) switch (_context2.prev = _context2.next) {
            case 0:
              _context2.next = 2;
              return mermaidPromise;
            case 2:
              mermaidInstance = _context2.sent;
              if (mermaidInstance) {
                _context2.next = 5;
                break;
              }
              return _context2.abrupt("return");
            case 5:
              mermaidInstance.initialize(mermaidConfig);
            case 6:
            case "end":
              return _context2.stop();
          }
        }, _callee2);
      }));
      return function initMermaid() {
        return _ref2.apply(this, arguments);
      };
    }();
    initMermaid();
  }, [mermaidConfig]);
};