refactor parse regexes

Signed-off-by: shmck <shawn.j.mckay@gmail.com>

Author: ShMcK

src/utils/parse.ts

@@ -7,6 +7,15 @@ type TutorialFrame = {
   levels: T.Level[];
 };
 
+const R = {
+  summary: /^#\s(?<tutorialTitle>.*)[\n\r]+(?<tutorialDescription>[^]*)/,
+  level: /^(#{2}\s(?<levelId>L?\d+\.?)\s(?<levelTitle>.*)[\n\r]*(>\s(?<levelSummary>.*))?[\n\r]+(?<levelContent>[^]*))/,
+  step: /^(#{3}\s(?<stepTitle>.*)[\n\r]+(?<stepContent>[^]*))/,
+  hints: /^(#{4}\sHINTS[\n\r]+([\*|\-]\s(?<hintContent>[^]*))[\n\r]+)+/,
+  subtasks: /^(#{4}\sSUBTASKS[\n\r]+([\*|\-]\s(?<subtaskContent>[^]*))[\n\r]+)+/,
+  listItem: /[\n\r]+[\*|\-]\s/,
+};
+
 export function parseMdContent(md: string): TutorialFrame | never {
   let start: number = -1;
   const parts: any[] = [];
@@ -34,9 +43,7 @@ export function parseMdContent(md: string): TutorialFrame | never {
   };
 
   // Capture summary
-  const summaryMatch = parts
-    .shift()
-    .match(/^#\s(?<tutorialTitle>.*)[\n\r]+(?<tutorialDescription>[^]*)/);
+  const summaryMatch = parts.shift().match(R.summary);
   if (summaryMatch.groups.tutorialTitle) {
     mdContent.summary.title = summaryMatch.groups.tutorialTitle.trim();
   }
@@ -49,8 +56,7 @@ export function parseMdContent(md: string): TutorialFrame | never {
   // Identify each part of the content
   parts.forEach((section: string) => {
     // match level
-    const levelRegex = /^(#{2}\s(?<levelId>L?\d+\.?)\s(?<levelTitle>.*)[\n\r]*(>\s(?<levelSummary>.*))?[\n\r]+(?<levelContent>[^]*))/;
-    const levelMatch: RegExpMatchArray | null = section.match(levelRegex);
+    const levelMatch: RegExpMatchArray | null = section.match(R.level);
 
     if (levelMatch && levelMatch.groups) {
       const levelId = levelMatch.groups.levelId.replace(".", "");
@@ -77,8 +83,7 @@ export function parseMdContent(md: string): TutorialFrame | never {
       };
     } else {
       // match step
-      const stepRegex = /^(#{3}\s(?<stepTitle>.*)[\n\r]+(?<stepContent>[^]*))/;
-      const stepMatch: RegExpMatchArray | null = section.match(stepRegex);
+      const stepMatch: RegExpMatchArray | null = section.match(R.step);
       if (stepMatch && stepMatch.groups) {
         current = {
           levelId: current.levelId,
@@ -91,17 +96,14 @@ export function parseMdContent(md: string): TutorialFrame | never {
           content: stepContent.trim(),
         };
       } else {
-        const hintDetectRegex = /^(#{4}\sHINTS[\n\r]+([\*|\-]\s(?<hintContent>[^]*))[\n\r]+)+/;
-        const hintMatch = section.match(hintDetectRegex);
-        const subtaskDetectRegex = /^(#{4}\sSUBTASKS[\n\r]+([\*|\-]\s(?<subtaskContent>[^]*))[\n\r]+)+/;
-        const subtaskMatch = section.match(subtaskDetectRegex);
-        const listItemregex = /[\n\r]+[\*|\-]\s/;
+        const hintMatch = section.match(R.hints);
+        const subtaskMatch = section.match(R.subtasks);
 
         switch (true) {
           // parse hints from stepContent
           case !!hintMatch:
             const hints = section
-              .split(listItemregex)
+              .split(R.listItem)
               .slice(1) // remove #### HINTS
               .map((h) => h.trim());
             if (hints.length) {
@@ -113,7 +115,7 @@ export function parseMdContent(md: string): TutorialFrame | never {
           // parse subtasks from stepContent
           case !!subtaskMatch:
             const subtasks = section
-              .split(listItemregex)
+              .split(R.listItem)
               .slice(1) // remove #### SUBTASKS
               .map((h) => h.trim());
             if (subtasks.length) {