# All files / src/html NodeProcessor.ts

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66.26% Branches 55/83
84.21% Functions 16/19
73.95% Lines 159/215

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     import path from 'path';
    import cheerio from 'cheerio';
    import htmlparser, { DomElement } from 'htmlparser2';
    import Promise from 'bluebird';
    import isArray from 'lodash/isArray';
    import has from 'lodash/has';

    import { ATTRIB_CWF } from '../constants';
    import { Context } from './Context';
    import { createErrorNode } from './elements';
    import { PageSources } from '../Page/PageSources';
    import { isMarkdownFileExt } from '../utils/fsUtil';
    import * as logger from '../utils/logger';
    import * as linkProcessor from './linkProcessor';
    import type { VariableProcessor } from '../variables/VariableProcessor';
    import { warnConflictingAtributesMap } from './warnings';
    import { shiftSlotNodeDeeper, transformOldSlotSyntax } from './vueSlotSyntaxProcessor';
    import { MdAttributeRenderer } from './MdAttributeRenderer';
    import { MarkdownProcessor } from './MarkdownProcessor';
    import { processScriptAndStyleTag } from './scriptAndStyleTagProcessor';
    import type { SiteLinkManager } from './SiteLinkManager';
    import type { PluginManager } from '../plugins/PluginManager';
    import { processInclude, processPanelSrc, processPopoverSrc } from './includePanelProcessor';

    import { PageNavProcessor, renderSiteNav, addSitePageNavPortal } from './siteAndPageNavProcessor';
    import { highlightCodeBlock, setCodeLineNumbers } from './codeblockProcessor';
    import { setHeadingId, assignPanelId } from './headerProcessor';
    import { FootnoteProcessor } from './FootnoteProcessor';
    import { MbNode, NodeOrText, TextElement } from '../utils/node';
    import { processUlNode } from './CustomListIconProcessor';

    const fm = require('fastmatter');

    const _ = {
      isArray,
      has,
    };

    // Load our htmlparser2 patch for supporting "special" tags
    require('../patches/htmlparser2');

    const FRONTMATTER_FENCE = '---';

    cheerio.prototype.options.decodeEntities = false; // Don't escape HTML entities

    export type NodeProcessorConfig = {
      baseUrl: string,
      baseUrlMap: Set<string>,
      rootPath: string,
      outputPath: string,
      ignore: string[],
      addressablePagesSource: string[],
      intrasiteLinkValidation: { enabled: boolean },
      codeLineNumbers: boolean,
      plantumlCheck: boolean,
      headerIdMap: {
        [id: string]: number,
      },
    };

    export class NodeProcessor {
      frontmatter: Record<string, string> = {};

      headTop: string[] = [];
      headBottom: string[] = [];
      scriptBottom: string[] = [];

      markdownProcessor: MarkdownProcessor;
      footnoteProcessor = new FootnoteProcessor();
      mdAttributeRenderer: MdAttributeRenderer;
      pageNavProcessor = new PageNavProcessor();

      processedModals: Record<string, boolean> = {};

      constructor(
        private config: NodeProcessorConfig,
        private pageSources: PageSources,
        private variableProcessor: VariableProcessor,
        private pluginManager: PluginManager,
        private siteLinkManager: SiteLinkManager,
        private userScriptsAndStyles: string[] | undefined,
        docId = '',
      ) {
        this.markdownProcessor = new MarkdownProcessor(docId);
        this.mdAttributeRenderer = new MdAttributeRenderer(this.markdownProcessor);
      }

      /*
       * Private utility functions
       */

      static _trimNodes(nodeOrText: NodeOrText) {
        Iif (NodeProcessor._isText(nodeOrText)) return;
        const node = nodeOrText as MbNode;
        if (node.name === 'pre' || node.name === 'code') {
          return;
        }
        if (node.children) {
          for (let n = 0; n < node.children.length; n += 1) {
            const child = node.children[n];
            if (child.type === 'comment'
              || (child.type === 'text' && n === node.children.length - 1 && !/\S/.test(child.data))) {
              node.children.splice(n, 1);
              n -= 1;
            } else if (child.type === 'tag') {
              NodeProcessor._trimNodes(child);
            }
          }
        }
      }

      static _isText(node: NodeOrText) {
        return node.type === 'text' || node.type === 'comment';
      }

      /*
       * Frontmatter collection
       */
      private _processFrontmatter(node: MbNode, context: Context) {
        let currentFrontmatter = {};
        const frontmatter = cheerio(node);
        if (!context.processingOptions.omitFrontmatter && frontmatter.text().trim()) {
          // Retrieves the frontmatter from either the first frontmatter element
          // or from a frontmatter element that includes from another file
          // The latter case will result in the data being wrapped in a div
          const frontmatterIncludeDiv = frontmatter.find('div');
          const frontmatterData = frontmatterIncludeDiv.length
            ? ((frontmatterIncludeDiv[0] as MbNode).children as MbNode[])[0].data
            : ((frontmatter[0] as MbNode).children as MbNode[])[0].data;
          const frontmatterWrapped = `${FRONTMATTER_FENCE}\n${frontmatterData}\n${FRONTMATTER_FENCE}`;

          currentFrontmatter = fm(frontmatterWrapped).attributes;
        }

        this.frontmatter = {
          ...this.frontmatter,
          ...currentFrontmatter,
        };
        cheerio(node).remove();
      }

      /*
       * Layout element collection
       */

      private static collectLayoutEl(node: MbNode): string | null {
        const $ = cheerio(node);
        const html = $.html();
        $.remove();
        return html;
      }

      /**
       * Removes the node if modal id already exists, processes node otherwise
       */
      private processModal(node: MbNode) {
        Iif (this.processedModals[node.attribs.id]) {
          cheerio(node).remove();
        } else {
          this.processedModals[node.attribs.id] = true;
          this.mdAttributeRenderer.processModalAttributes(node);
        }
      }

      /*
       * API
       */
      processNode(nodeOrText: NodeOrText, context: Context): Context {
        try {
          if (NodeProcessor._isText(nodeOrText)) return context;
          const node = nodeOrText as MbNode;

          transformOldSlotSyntax(node);
          shiftSlotNodeDeeper(node);

          // log warnings for conflicting attributes
          if (_.has(warnConflictingAtributesMap, node.name)) { warnConflictingAtributesMap[node.name](node); }

          switch (node.name) {
          case 'frontmatter':
            this._processFrontmatter(node, context);
            break;
          case 'body':
            // eslint-disable-next-line no-console
            console.warn(`<body> tag found in ${node.attribs[ATTRIB_CWF]}. This may cause formatting errors.`);
            break;
          case 'include':
            this.markdownProcessor.docId += 1; // used in markdown-it-footnotes
            return processInclude(node, context, this.pageSources, this.variableProcessor,
                                  (text: string) => this.markdownProcessor.renderMd(text),
                                  (text: string) => this.markdownProcessor.renderMdInline(text),
                                  this.config);
          case 'panel':
            this.mdAttributeRenderer.processPanelAttributes(node);
            return processPanelSrc(node, context, this.pageSources, this.config);
          case 'question':
            this.mdAttributeRenderer.processQuestion(node);
            break;
          case 'ul':
            processUlNode(node);
            break;
          case 'q-option':
            this.mdAttributeRenderer.processQOption(node);
            break;
          case 'quiz':
            this.mdAttributeRenderer.processQuiz(node);
            break;
          case 'popover':
            this.mdAttributeRenderer.processPopoverAttributes(node);
            return processPopoverSrc(node, context, this.pageSources, this.variableProcessor,
                                     (text: string) => this.markdownProcessor.renderMd(text), this.config);
          case 'tooltip':
            this.mdAttributeRenderer.processTooltip(node);
            break;
          case 'modal':
            this.processModal(node);
            break;
          case 'tab':
          case 'tab-group':
            this.mdAttributeRenderer.processTabAttributes(node);
            break;
          case 'box':
            this.mdAttributeRenderer.processBoxAttributes(node);
            break;
          case 'dropdown':
            this.mdAttributeRenderer.processDropdownAttributes(node);
            break;
          case 'thumbnail':
            this.mdAttributeRenderer.processThumbnailAttributes(node);
            break;
          case 'page-nav':
            this.pageNavProcessor.renderPageNav(node);
            break;
          case 'page-nav-print':
            PageNavProcessor.transformPrintContainer(node);
            break;
          case 'site-nav':
            renderSiteNav(node);
            break;
          case 'mb-temp-footnotes':
            this.footnoteProcessor.processMbTempFootnotes(node);
            break;
          case 'script':
          case 'style':
            processScriptAndStyleTag(node, this.userScriptsAndStyles);
            break;
          case 'scroll-top-button':
            this.mdAttributeRenderer.processScrollTopButtonAttributes(node);
            break;
          case 'a-point':
            this.mdAttributeRenderer.processAnnotationPointAttributes(node);
            break;
          case 'code':
            setCodeLineNumbers(node, this.config.codeLineNumbers);
            // fall through
          case 'annotation': // Annotations are added automatically by KaTeX when rendering math formulae.
          case 'eq': // markdown-it-texmath html tag
          case 'eqn': // markdown-it-texmath html tag
          case 'thumb': // image
            /*
             * These are not components from MarkBind Vue components.
             * We have to add 'v-pre' to let Vue know to ignore this tag and not compile it.
             *
             * Although there won't be warnings if we use production Vue, it is still good to add this.
             */
            if (!_.has(node.attribs, 'v-pre')) { node.attribs['v-pre'] = ''; }
            break;
          default:
            break;
          }
        } catch (error) {
          logger.error(error);
        }

        return context;
      }

      postProcessNode(nodeOrText: NodeOrText) {
        if (NodeProcessor._isText(nodeOrText)) return;
        const node = nodeOrText as MbNode;

        try {
          switch (node.name) {
          case 'pre':
            highlightCodeBlock(node);
            break;
          case 'panel':
            assignPanelId(node);
            break;
          case 'head-top': {
            const collected = NodeProcessor.collectLayoutEl(node);
            Iif (collected) {
              this.headTop.push(collected);
            }
            break;
          }
          case 'head-bottom': {
            const collected = NodeProcessor.collectLayoutEl(node);
            Iif (collected) {
              this.headBottom.push(collected);
            }
            break;
          }
          case 'script-bottom': {
            const collected = NodeProcessor.collectLayoutEl(node);
            Iif (collected) {
              this.scriptBottom.push(collected);
            }
            break;
          }
          default:
            break;
          }
        } catch (error) {
          logger.error(error);
        }

        if (node.attribs) {
          delete node.attribs[ATTRIB_CWF];
        }
      }

      private traverse(dom: DomElement, context: Context): NodeOrText {
        if (NodeProcessor._isText(dom)) {
          return dom as TextElement;
        }
        const node = dom as MbNode;
        node.name = node.name.toLowerCase();
        if (linkProcessor.hasTagLink(node)) {
          linkProcessor.convertRelativeLinks(node, context.cwf, this.config.rootPath, this.config.baseUrl);
          linkProcessor.convertMdExtToHtmlExt(node);
          Iif (this.config.intrasiteLinkValidation.enabled) {
            this.siteLinkManager.collectIntraLinkToValidate(node, context.cwf);
          }
          linkProcessor.collectSource(node, this.config.rootPath, this.config.baseUrl, this.pageSources);
        }

        switch (node.name) {
        case 'md':
          node.name = 'span';
          cheerio(node).html(
            this.markdownProcessor.renderMdInline(cheerio.html(node.children as unknown as cheerio.Element)),
          );
          break;
        case 'markdown':
          node.name = 'div';
          cheerio(node).html(
            this.markdownProcessor.renderMd(cheerio.html(node.children as unknown as cheerio.Element)),
          );
          break;
        default:
          break;
        }

        // eslint-disable-next-line no-param-reassign
        context = this.processNode(node, context);
        this.pluginManager.processNode(node);

        if (node.children) {
          node.children.forEach((child) => {
            this.traverse(child, context);
          });
        }

        this.postProcessNode(node);

        addSitePageNavPortal(node);

        const isHeadingTag = (/^h[1-6]$/).test(node.name);
        if (isHeadingTag && !node.attribs.id) {
          setHeadingId(node, this.config);
        }

        this.pluginManager.postProcessNode(node);

        return node;
      }

      process(
        file: string,
        content: string,
        cwf: string = file,
        extraVariables: Record<string, string> = {},
      ) {
        const context = new Context(cwf, [], extraVariables, {});

        return new Promise((resolve, reject) => {
          const handler = new htmlparser.DomHandler((error, dom) => {
            Iif (error) {
              reject(error);
              return;
            }
            const mainHtmlNodes = dom.map((d) => {
              let processed: NodeOrText;
              try {
                processed = this.traverse(d, context);
              } catch (err: any) {
                err.message += `\nError while rendering '${file}'`;
                logger.error(err);
                processed = createErrorNode(d, err);
              }
              return processed;
            });
            mainHtmlNodes.forEach(d => NodeProcessor._trimNodes(d));

            const footnotesHtml = this.footnoteProcessor.combineFootnotes(node => this.processNode(
              node, new Context(cwf, [], extraVariables, {}),
            ));
            const mainHtml = cheerio(mainHtmlNodes).html();
            const mainHtmlWithUniqPageNavUuid = this.pageNavProcessor.finalizePageNavUuid(
              mainHtml, mainHtmlNodes, footnotesHtml);

            resolve(mainHtmlWithUniqPageNavUuid + footnotesHtml);
          });
          const parser = new htmlparser.Parser(handler);
          const fileExt = path.extname(file);
          if (isMarkdownFileExt(fileExt)) {
            const renderedContent = this.markdownProcessor.renderMd(content);
            // Wrap with <root> as $.remove() does not work on top level nodes
            parser.parseComplete(`<root>${renderedContent}</root>`);
          } else Eif (fileExt === '.html') {
            parser.parseComplete(`<root>${content}</root>`);
          } else {
            const error = new Error(`Unsupported File Extension: '${fileExt}'`);
            reject(error);
          }
        });
      }
    }