Fix scanner offset and make it easier to read

src/compiler/scanner.ts

@@ -1745,10 +1745,10 @@ namespace ts {
                     case CharacterCodes.slash:
                         // Single-line comment
                         if (text.charCodeAt(pos + 1) === CharacterCodes.slash) {
-                            pos += 2;
                             if (text.charCodeAt(pos + 2) === CharacterCodes.slash) {
                                 tokenFlags |= TokenFlags.PrecedingJSDocComment;
                             }
+                            pos += 2;
 
                             while (pos < end) {
                                 if (isLineBreak(text.charCodeAt(pos))) {
@@ -1773,10 +1773,10 @@ namespace ts {
                         }
                         // Multi-line comment
                         if (text.charCodeAt(pos + 1) === CharacterCodes.asterisk) {
-                            pos += 2;
-                            if (text.charCodeAt(pos) === CharacterCodes.asterisk && text.charCodeAt(pos + 1) !== CharacterCodes.slash) {
+                            if (text.charCodeAt(pos + 2) === CharacterCodes.asterisk && text.charCodeAt(pos + 3) !== CharacterCodes.slash) {
                                 tokenFlags |= TokenFlags.PrecedingJSDocComment;
                             }
+                            pos += 2;
 
                             let commentClosed = false;
                             let lastLineStart = tokenPos;

tests/baselines/reference/tripleSlashJsdoc.symbols

@@ -0,0 +1,40 @@
+=== tests/cases/conformance/jsdoc/tripleSlash.js ===
+/// @type {number} - TODO this is still skipped for some reason
+var x;
+>x : Symbol(x, Decl(tripleSlash.js, 1, 3))
+
+/// Adds one
+/// @param {number} n - this is a long,
+/// multiline comment
+///
+/// @return {number}
+function add1(n) {
+>add1 : Symbol(add1, Decl(tripleSlash.js, 1, 6))
+>n : Symbol(n, Decl(tripleSlash.js, 8, 14))
+
+    return n + 1
+>n : Symbol(n, Decl(tripleSlash.js, 8, 14))
+}
+
+// Should be the same
+
+/**  Adds one
+ * @param {number} n - this is a long,
+ * multiline comment
+ *
+ * @return {number}
+*/
+function add2(n) {
+>add2 : Symbol(add2, Decl(tripleSlash.js, 10, 1))
+>n : Symbol(n, Decl(tripleSlash.js, 20, 14))
+
+    return n + 1
+>n : Symbol(n, Decl(tripleSlash.js, 20, 14))
+}
+
+/// I documented this const
+const documented = ""
+>documented : Symbol(documented, Decl(tripleSlash.js, 25, 5))
+
+
+

tests/baselines/reference/tripleSlashJsdoc.types

@@ -0,0 +1,45 @@
+=== tests/cases/conformance/jsdoc/tripleSlash.js ===
+/// @type {number} - TODO this is still skipped for some reason
+var x;
+>x : number
+
+/// Adds one
+/// @param {number} n - this is a long,
+/// multiline comment
+///
+/// @return {number}
+function add1(n) {
+>add1 : (n: number) => number
+>n : number
+
+    return n + 1
+>n + 1 : number
+>n : number
+>1 : 1
+}
+
+// Should be the same
+
+/**  Adds one
+ * @param {number} n - this is a long,
+ * multiline comment
+ *
+ * @return {number}
+*/
+function add2(n) {
+>add2 : (n: number) => number
+>n : number
+
+    return n + 1
+>n + 1 : number
+>n : number
+>1 : 1
+}
+
+/// I documented this const
+const documented = ""
+>documented : ""
+>"" : ""
+
+
+

tests/cases/fourslash/commentsCommentParsing.ts

@@ -202,7 +202,7 @@
 ////class NoQuic/*50*/kInfoClass {
 ////}
 
-verify.signatureHelp({ marker: "1", docComment: "" });
+verify.signatureHelp({ marker: "1", docComment: " This is simple /// comments" });
 verify.quickInfoAt("1q", "function simple(): void");
 
 verify.signatureHelp({ marker: "2", docComment: "" });