overleaf-cep/services/web/app/src/Features/Metadata/MetaHandler.js

/* eslint-disable
    n/handle-callback-err,
    max-len,
    no-cond-assign,
*/
// TODO: This file was created by bulk-decaffeinate.
// Fix any style issues and re-enable lint.
/*
 * decaffeinate suggestions:
 * DS101: Remove unnecessary use of Array.from
 * DS102: Remove unnecessary code created because of implicit returns
 * DS207: Consider shorter variations of null checks
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
let MetaHandler
const ProjectEntityHandler = require('../Project/ProjectEntityHandler')
const DocumentUpdaterHandler = require('../DocumentUpdater/DocumentUpdaterHandler')
const packageMapping = require('./packageMapping')

module.exports = MetaHandler = {
  labelRegex() {
    return /\\label{(.{0,80}?)}/g
  },

  usepackageRegex() {
    return /^\\usepackage(?:\[.{0,80}?])?{(.{0,80}?)}/g
  },

  ReqPackageRegex() {
    return /^\\RequirePackage(?:\[.{0,80}?])?{(.{0,80}?)}/g
  },

  getAllMetaForProject(projectId, callback) {
    if (callback == null) {
      callback = function () {}
    }
    return DocumentUpdaterHandler.flushProjectToMongo(
      projectId,
      function (err) {
        if (err != null) {
          return callback(err)
        }
        return ProjectEntityHandler.getAllDocs(projectId, function (err, docs) {
          if (err != null) {
            return callback(err)
          }
          const projectMeta = MetaHandler.extractMetaFromProjectDocs(docs)
          return callback(null, projectMeta)
        })
      }
    )
  },

  getMetaForDoc(projectId, docId, callback) {
    if (callback == null) {
      callback = function () {}
    }
    return DocumentUpdaterHandler.flushDocToMongo(
      projectId,
      docId,
      function (err) {
        if (err != null) {
          return callback(err)
        }
        return ProjectEntityHandler.getDoc(
          projectId,
          docId,
          function (err, lines) {
            if (err != null) {
              return callback(err)
            }
            const docMeta = MetaHandler.extractMetaFromDoc(lines)
            return callback(null, docMeta)
          }
        )
      }
    )
  },

  extractMetaFromDoc(lines) {
    let pkg
    const docMeta = { labels: [], packages: {} }
    const packages = []
    const labelRe = MetaHandler.labelRegex()
    const packageRe = MetaHandler.usepackageRegex()
    const reqPackageRe = MetaHandler.ReqPackageRegex()
    for (const rawLine of Array.from(lines)) {
      const line = MetaHandler._getNonCommentedContent(rawLine)
      let labelMatch
      let clean, messy, packageMatch
      while ((labelMatch = labelRe.exec(line))) {
        let label
        if ((label = labelMatch[1])) {
          docMeta.labels.push(label)
        }
      }
      while ((packageMatch = packageRe.exec(line))) {
        if ((messy = packageMatch[1])) {
          for (pkg of Array.from(messy.split(','))) {
            if ((clean = pkg.trim())) {
              packages.push(clean)
            }
          }
        }
      }
      while ((packageMatch = reqPackageRe.exec(line))) {
        if ((messy = packageMatch[1])) {
          for (pkg of Array.from(messy.split(','))) {
            if ((clean = pkg.trim())) {
              packages.push(clean)
            }
          }
        }
      }
    }
    for (pkg of Array.from(packages)) {
      if (packageMapping[pkg] != null) {
        docMeta.packages[pkg] = packageMapping[pkg]
      }
    }
    return docMeta
  },

  extractMetaFromProjectDocs(projectDocs) {
    const projectMeta = {}
    for (const _path in projectDocs) {
      const doc = projectDocs[_path]
      projectMeta[doc._id] = MetaHandler.extractMetaFromDoc(doc.lines)
    }
    return projectMeta
  },

  /**
   * Trims comment content from line
   * @param {string} rawLine
   * @returns {string}
   */
  _getNonCommentedContent(rawLine) {
    const commentStart = /(?:^%)|(?:[^\\]%)/
    const match = rawLine.match(commentStart)
    if (match) {
      return rawLine.slice(0, match.index)
    }
    return rawLine
  },
}