Study what happens when you type tsc (to scanner)

Author: cangSDARM

src/compiler/parser.ts

@@ -595,6 +595,7 @@ namespace ts {
         }
     }
 
+    /** 单个文件的parser */
     export function createSourceFile(fileName: string, sourceText: string, languageVersion: ScriptTarget, setParentNodes = false, scriptKind?: ScriptKind): SourceFile {
         performance.mark("beforeParse");
         let result: SourceFile;
@@ -775,7 +776,7 @@ namespace ts {
         let parseErrorBeforeNextFinishedNode = false;
 
         /**
-         * 设置初始状态，并将工作交给 parseSourceFileWorker 函数(For simplified Stack)
+         * Do parser. 设置初始状态，并将工作交给 parseSourceFileWorker 函数
          * @param fileName The name of source file
          * @param sourceText The text of source file
          * @param languageVersion 编译后的版本，如es5, es6等

src/compiler/program.ts

@@ -708,7 +708,7 @@ namespace ts {
         let noDiagnosticsTypeChecker: TypeChecker;
         let classifiableNames: UnderscoreEscapedMap<true>;
         const ambientModuleNameToUnmodifiedFileName = createMap<string>();
-        // Todo:: Use this to report why file was included in --extendedDiagnostics
+        // TODO: Use this to report why file was included in --extendedDiagnostics
         let refFileMap: MultiMap<ts.RefFile> | undefined;
 
         const cachedBindAndCheckDiagnosticsForFile: DiagnosticCache<Diagnostic> = {};
@@ -2239,7 +2239,8 @@ namespace ts {
             fileName: string,
             getSourceFile: (fileName: string) => SourceFile | undefined,
             fail?: (diagnostic: DiagnosticMessage, ...argument: string[]) => void,
-            refFile?: SourceFile): SourceFile | undefined {
+            refFile?: SourceFile
+        ): SourceFile | undefined {
 
             if (hasExtension(fileName)) {
                 const canonicalFileName = host.getCanonicalFileName(fileName);
@@ -2339,7 +2340,7 @@ namespace ts {
             return redirect;
         }
 
-        // Get source file from normalized fileName
+        /** Get source file from normalized fileName */
         function findSourceFile(fileName: string, path: Path, isDefaultLib: boolean, ignoreNoDefaultLib: boolean, refFile: RefFile | undefined, packageId: PackageId | undefined): SourceFile | undefined {
             if (useSourceOfProjectReferenceRedirect) {
                 let source = getSourceOfProjectReferenceRedirect(fileName);
@@ -2543,7 +2544,6 @@ namespace ts {
             return getResolvedProjectReferenceToRedirect(fileName);
         }
 
-
         function getProjectReferenceOutputName(referencedProject: ResolvedProjectReference, fileName: string) {
             const out = referencedProject.commandLine.options.outFile || referencedProject.commandLine.options.out;
             return out ?