transform keys and text service

src/app/modules/songs/services/text-rendering.service.ts

@@ -17,7 +17,6 @@ export interface Line {
   text: string;
 }
 
-
 export interface Section {
   type: SectionType;
   number: number;
@@ -32,5 +31,40 @@ export class TextRenderingService {
   constructor() {
   }
 
+  private regexSection = /(Strophe|Refrain|Bridge)/;
+  private regexChords = /\b([CDEFGAHBcdefgahb](#|##|b|bb|sus|maj|maj7|min|aug|\d+|\/[CDEFGAHBcdefgahb])?\b)/;
+
+  public parse(text: string): Section[] {
+    const arrayOfLines = text.split(/\r?\n/).filter(_ => _);
+    const sections = arrayOfLines.reduce((array, line) => {
+      if (line.match(this.regexSection)) return [...array, {
+        type: this.getSectionTypeOfLine(line),
+        number: -1,
+        lines: []
+      }];
+      array[array.length - 1].lines.push(this.getLineOfLineText(line));
+      return array;
+    }, [] as Section[]);
+
+    return sections;
+  }
+
+  private getLineOfLineText(text: string): Line {
+    const matches = !!text.match(this.regexChords);
+    const type = matches ? LineType.chrod : LineType.text;
+    return {type, text}
+  }
+
+  private getSectionTypeOfLine(line: string): SectionType {
+    const typeString = line.match(this.regexSection)[1];
+    switch (typeString) {
+      case  "Strophe":
+        return SectionType.Verse;
+      case  "Refrain":
+        return SectionType.Chorus;
+      case  "Bridge":
+        return SectionType.Bridge;
+    }
+  }
 
 }