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services/web/app/src/Features/Documents/DocumentHelper.js

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+/* eslint-disable
+    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 DocumentHelper
+module.exports = DocumentHelper = {
+  getTitleFromTexContent(content, maxContentToScan) {
+    if (maxContentToScan == null) {
+      maxContentToScan = 30000
+    }
+    const TITLE_WITH_CURLY_BRACES = /\\[tT]itle\*?\s*{([^}]+)}/
+    const TITLE_WITH_SQUARE_BRACES = /\\[tT]itle\s*\[([^\]]+)\]/
+    for (const line of Array.from(
+      DocumentHelper._getLinesFromContent(content, maxContentToScan)
+    )) {
+      let match
+      if (
+        (match =
+          line.match(TITLE_WITH_CURLY_BRACES) ||
+          line.match(TITLE_WITH_SQUARE_BRACES))
+      ) {
+        return DocumentHelper.detex(match[1])
+      }
+    }
+
+    return null
+  },
+
+  contentHasDocumentclass(content, maxContentToScan) {
+    if (maxContentToScan == null) {
+      maxContentToScan = 30000
+    }
+    for (const line of Array.from(
+      DocumentHelper._getLinesFromContent(content, maxContentToScan)
+    )) {
+      // We've had problems with this regex locking up CPU.
+      // Previously /.*\\documentclass/ would totally lock up on lines of 500kb (data text files :()
+      // This regex will only look from the start of the line, including whitespace so will return quickly
+      // regardless of line length.
+      if (line.match(/^\s*\\documentclass/)) {
+        return true
+      }
+    }
+
+    return false
+  },
+
+  detex(string) {
+    return string
+      .replace(/\\LaTeX/g, 'LaTeX')
+      .replace(/\\TeX/g, 'TeX')
+      .replace(/\\TikZ/g, 'TikZ')
+      .replace(/\\BibTeX/g, 'BibTeX')
+      .replace(/\\\[[A-Za-z0-9. ]*\]/g, ' ') // line spacing
+      .replace(/\\(?:[a-zA-Z]+|.|)/g, '')
+      .replace(/{}|~/g, ' ')
+      .replace(/[${}]/g, '')
+      .replace(/ +/g, ' ')
+      .trim()
+  },
+
+  _getLinesFromContent(content, maxContentToScan) {
+    if (typeof content === 'string') {
+      return content.substring(0, maxContentToScan).split('\n')
+    } else {
+      return content
+    }
+  },
+}