Add getPublishedOutput method in docmap-parser [elifesciences/enhance…

…d-preprints-issues#1120]

This commit introduces a new function, getPublishedOutput, in docmap-parser.
This function checks the length of preprintOutputs and versionOfRecordOutputs
and returns the first item if there's one, otherwise it returns false. The
existing function getPublishedVersionOfRecord has been updated to use the newly
implemented getPublishedOutput function.

src/parser/docmap-parser.ts

@@ -385,6 +385,17 @@ const extractExpressions = (step: Step): ExtractedExpressions => {
   };
 };
 
+const getPublishedOutput = (step: Step): Item | false => {
+  const items = extractExpressions(step);
+  if (items.preprintOutputs.length === 1) {
+    return items.preprintOutputs[0];
+  }
+  if (items.versionOfRecordOutputs.length === 1) {
+    return items.versionOfRecordOutputs[0];
+  }
+  return false;
+};
+
 const getPublishedVersionOfRecord = (step: Step): Item | false => {
   const items = extractExpressions(step);
   return (items.versionOfRecordOutputs.length === 1) ? items.versionOfRecordOutputs[0] : false;
@@ -470,8 +481,8 @@ const parseStep = (step: Step, preprints: Array<ReviewedPreprint>, manuscript: M
         preprint.corrections = [];
       }
       const correction = { correctedDate: preprintCorrectedAssertion.happened };
-      const versionOfRecord = getPublishedVersionOfRecord(step);
-      const content = (versionOfRecord && versionOfRecord.content ? versionOfRecord.content : []).reduce<string[]>((ac, { type, url }) => {
+      const publishedOutput = getPublishedOutput(step);
+      const content = (publishedOutput && publishedOutput.content ? publishedOutput.content : []).reduce<string[]>((ac, { type, url }) => {
         if (type === 'web-page' && url) {
           ac.push(url);
         }