From 601f214b876697ee1143575b4b2fff2b2214fa11 Mon Sep 17 00:00:00 2001
From: David Sherret <dsherret@users.noreply.github.com>
Date: Mon, 11 Sep 2023 17:42:01 -0500
Subject: [PATCH] feat: automatically quote property keys if necessary when
 writing structures (#1451)

---
 .../GetAccessorDeclarationStructurePrinter.ts |  4 ++-
 .../MethodDeclarationStructurePrinter.ts      |  4 +--
 .../PropertyDeclarationStructurePrinter.ts    |  3 +-
 .../SetAccessorDeclarationStructurePrinter.ts |  4 ++-
 .../enum/EnumMemberStructurePrinter.ts        |  9 ++----
 .../MethodSignatureStructurePrinter.ts        |  3 +-
 .../PropertySignatureStructurePrinter.ts      |  3 +-
 .../classDeclarationStructurePrinterTests.ts  | 18 +++++++----
 ...terfaceDeclarationStructurePrinterTests.ts | 29 +++++++++++++++++
 packages/ts-morph/src/utils/WriterUtils.ts    | 11 +++++++
 .../ts-morph/src/utils/namingValidator.ts     | 31 +++++++++++++++++--
 11 files changed, 97 insertions(+), 22 deletions(-)

diff --git a/packages/ts-morph/src/structurePrinters/class/GetAccessorDeclarationStructurePrinter.ts b/packages/ts-morph/src/structurePrinters/class/GetAccessorDeclarationStructurePrinter.ts
index 5be2087fe..bc5497d75 100644
--- a/packages/ts-morph/src/structurePrinters/class/GetAccessorDeclarationStructurePrinter.ts
+++ b/packages/ts-morph/src/structurePrinters/class/GetAccessorDeclarationStructurePrinter.ts
@@ -1,6 +1,7 @@
 import { CodeBlockWriter } from "../../codeBlockWriter";
 import { StructurePrinterFactory } from "../../factories";
 import { GetAccessorDeclarationStructure, OptionalKind } from "../../structures";
+import { WriterUtils } from "../../utils";
 import { BlankLineFormattingStructuresPrinter } from "../formatting";
 import { NodePrinter } from "../NodePrinter";
 
@@ -19,7 +20,8 @@ export class GetAccessorDeclarationStructurePrinter extends NodePrinter<Optional
     this.factory.forJSDoc().printDocs(writer, structure.docs);
     this.factory.forDecorator().printTexts(writer, structure.decorators);
     this.factory.forModifierableNode().printText(writer, structure);
-    writer.write(`get ${structure.name}`);
+    writer.write("get ");
+    WriterUtils.writePropertyName(writer, structure.name);
     this.factory.forTypeParameterDeclaration().printTextsWithBrackets(writer, structure.typeParameters);
     this.factory.forParameterDeclaration().printTextsWithParenthesis(writer, structure.parameters);
     this.factory.forReturnTypedNode().printText(writer, structure);
diff --git a/packages/ts-morph/src/structurePrinters/class/MethodDeclarationStructurePrinter.ts b/packages/ts-morph/src/structurePrinters/class/MethodDeclarationStructurePrinter.ts
index 1278ba0a3..049886e2d 100644
--- a/packages/ts-morph/src/structurePrinters/class/MethodDeclarationStructurePrinter.ts
+++ b/packages/ts-morph/src/structurePrinters/class/MethodDeclarationStructurePrinter.ts
@@ -2,7 +2,7 @@ import { ObjectUtils } from "@ts-morph/common";
 import { CodeBlockWriter } from "../../codeBlockWriter";
 import { StructurePrinterFactory } from "../../factories";
 import { MethodDeclarationOverloadStructure, MethodDeclarationStructure, OptionalKind } from "../../structures";
-import { setValueIfUndefined } from "../../utils";
+import { setValueIfUndefined, WriterUtils } from "../../utils";
 import { NodePrinter } from "../NodePrinter";
 
 export class MethodDeclarationStructurePrinter extends NodePrinter<OptionalKind<MethodDeclarationStructure>> {
@@ -81,7 +81,7 @@ export class MethodDeclarationStructurePrinter extends NodePrinter<OptionalKind<
       this.factory.forDecorator().printTexts(writer, (structure as MethodDeclarationStructure).decorators);
 
     this.factory.forModifierableNode().printText(writer, structure);
-    writer.write(name);
+    WriterUtils.writePropertyName(writer, name);
     writer.conditionalWrite(structure.hasQuestionToken, "?");
     this.factory.forTypeParameterDeclaration().printTextsWithBrackets(writer, structure.typeParameters);
     this.factory.forParameterDeclaration().printTextsWithParenthesis(writer, structure.parameters);
diff --git a/packages/ts-morph/src/structurePrinters/class/PropertyDeclarationStructurePrinter.ts b/packages/ts-morph/src/structurePrinters/class/PropertyDeclarationStructurePrinter.ts
index 8694f8eaf..40aa8f89a 100644
--- a/packages/ts-morph/src/structurePrinters/class/PropertyDeclarationStructurePrinter.ts
+++ b/packages/ts-morph/src/structurePrinters/class/PropertyDeclarationStructurePrinter.ts
@@ -1,5 +1,6 @@
 import { CodeBlockWriter } from "../../codeBlockWriter";
 import { OptionalKind, PropertyDeclarationStructure } from "../../structures";
+import { WriterUtils } from "../../utils";
 import { NewLineFormattingStructuresPrinter } from "../formatting";
 import { NodePrinter } from "../NodePrinter";
 
@@ -15,7 +16,7 @@ export class PropertyDeclarationStructurePrinter extends NodePrinter<OptionalKin
     this.factory.forDecorator().printTexts(writer, structure.decorators);
 
     this.factory.forModifierableNode().printText(writer, structure);
-    writer.write(structure.name);
+    WriterUtils.writePropertyName(writer, structure.name);
     writer.conditionalWrite(structure.hasQuestionToken, "?");
     writer.conditionalWrite(structure.hasExclamationToken && !structure.hasQuestionToken, "!");
     this.factory.forTypedNode(":").printText(writer, structure);
diff --git a/packages/ts-morph/src/structurePrinters/class/SetAccessorDeclarationStructurePrinter.ts b/packages/ts-morph/src/structurePrinters/class/SetAccessorDeclarationStructurePrinter.ts
index 6f5b537b7..41dad5078 100644
--- a/packages/ts-morph/src/structurePrinters/class/SetAccessorDeclarationStructurePrinter.ts
+++ b/packages/ts-morph/src/structurePrinters/class/SetAccessorDeclarationStructurePrinter.ts
@@ -1,6 +1,7 @@
 import { CodeBlockWriter } from "../../codeBlockWriter";
 import { StructurePrinterFactory } from "../../factories";
 import { OptionalKind, SetAccessorDeclarationStructure } from "../../structures";
+import { WriterUtils } from "../../utils";
 import { BlankLineFormattingStructuresPrinter } from "../formatting";
 import { NodePrinter } from "../NodePrinter";
 
@@ -20,7 +21,8 @@ export class SetAccessorDeclarationStructurePrinter extends NodePrinter<Optional
     this.factory.forDecorator().printTexts(writer, structure.decorators);
 
     this.factory.forModifierableNode().printText(writer, structure);
-    writer.write(`set ${structure.name}`);
+    writer.write("set ");
+    WriterUtils.writePropertyName(writer, structure.name);
     this.factory.forTypeParameterDeclaration().printTextsWithBrackets(writer, structure.typeParameters);
     this.factory.forParameterDeclaration().printTextsWithParenthesis(writer, structure.parameters);
     this.factory.forReturnTypedNode().printText(writer, structure);
diff --git a/packages/ts-morph/src/structurePrinters/enum/EnumMemberStructurePrinter.ts b/packages/ts-morph/src/structurePrinters/enum/EnumMemberStructurePrinter.ts
index 9f7e5d74d..caa9b6e61 100644
--- a/packages/ts-morph/src/structurePrinters/enum/EnumMemberStructurePrinter.ts
+++ b/packages/ts-morph/src/structurePrinters/enum/EnumMemberStructurePrinter.ts
@@ -2,7 +2,7 @@ import { StringUtils } from "@ts-morph/common";
 import { CodeBlockWriter } from "../../codeBlockWriter";
 import { EnumMemberStructure, OptionalKind } from "../../structures";
 import { WriterFunction } from "../../types";
-import { isValidVariableName } from "../../utils";
+import { isValidVariableName, WriterUtils } from "../../utils";
 import { CommaNewLineSeparatedStructuresPrinter } from "../formatting";
 import { NodePrinter } from "../NodePrinter";
 
@@ -26,12 +26,7 @@ export class EnumMemberStructurePrinter extends NodePrinter<OptionalKind<EnumMem
     }
 
     this.factory.forJSDoc().printDocs(writer, structure.docs);
-    // Adds quotes if structure is not a valid variable name
-    // AND the string is not enclosed in quotation marks
-    if (isValidVariableName(structure.name) || StringUtils.isQuoted(structure.name))
-      writer.write(structure.name);
-    else
-      writer.quote(structure.name);
+    WriterUtils.writePropertyName(writer, structure.name);
 
     if (typeof structure.value === "string") {
       const { value } = structure;
diff --git a/packages/ts-morph/src/structurePrinters/interface/MethodSignatureStructurePrinter.ts b/packages/ts-morph/src/structurePrinters/interface/MethodSignatureStructurePrinter.ts
index eee24388b..cb4f05050 100644
--- a/packages/ts-morph/src/structurePrinters/interface/MethodSignatureStructurePrinter.ts
+++ b/packages/ts-morph/src/structurePrinters/interface/MethodSignatureStructurePrinter.ts
@@ -1,5 +1,6 @@
 import { CodeBlockWriter } from "../../codeBlockWriter";
 import { MethodSignatureStructure, OptionalKind } from "../../structures";
+import { WriterUtils } from "../../utils";
 import { NewLineFormattingStructuresPrinter } from "../formatting";
 import { NodePrinter } from "../NodePrinter";
 
@@ -12,7 +13,7 @@ export class MethodSignatureStructurePrinter extends NodePrinter<OptionalKind<Me
 
   protected printTextInternal(writer: CodeBlockWriter, structure: OptionalKind<MethodSignatureStructure>) {
     this.factory.forJSDoc().printDocs(writer, structure.docs);
-    writer.write(structure.name);
+    WriterUtils.writePropertyName(writer, structure.name);
     writer.conditionalWrite(structure.hasQuestionToken, "?");
     this.factory.forTypeParameterDeclaration().printTextsWithBrackets(writer, structure.typeParameters);
     this.factory.forParameterDeclaration().printTextsWithParenthesis(writer, structure.parameters);
diff --git a/packages/ts-morph/src/structurePrinters/interface/PropertySignatureStructurePrinter.ts b/packages/ts-morph/src/structurePrinters/interface/PropertySignatureStructurePrinter.ts
index 587dcb0a0..8c04a40ae 100644
--- a/packages/ts-morph/src/structurePrinters/interface/PropertySignatureStructurePrinter.ts
+++ b/packages/ts-morph/src/structurePrinters/interface/PropertySignatureStructurePrinter.ts
@@ -1,5 +1,6 @@
 import { CodeBlockWriter } from "../../codeBlockWriter";
 import { OptionalKind, PropertySignatureStructure } from "../../structures";
+import { WriterUtils } from "../../utils";
 import { NewLineFormattingStructuresPrinter } from "../formatting";
 import { NodePrinter } from "../NodePrinter";
 
@@ -13,7 +14,7 @@ export class PropertySignatureStructurePrinter extends NodePrinter<OptionalKind<
   protected printTextInternal(writer: CodeBlockWriter, structure: OptionalKind<PropertySignatureStructure>) {
     this.factory.forJSDoc().printDocs(writer, structure.docs);
     this.factory.forModifierableNode().printText(writer, structure);
-    writer.write(structure.name);
+    WriterUtils.writePropertyName(writer, structure.name);
     writer.conditionalWrite(structure.hasQuestionToken, "?");
     this.factory.forTypedNode(":").printText(writer, structure);
     // why would someone write an initializer? I guess let them do it...
diff --git a/packages/ts-morph/src/tests/structurePrinters/class/classDeclarationStructurePrinterTests.ts b/packages/ts-morph/src/tests/structurePrinters/class/classDeclarationStructurePrinterTests.ts
index fd74d23be..4d4b192dc 100644
--- a/packages/ts-morph/src/tests/structurePrinters/class/classDeclarationStructurePrinterTests.ts
+++ b/packages/ts-morph/src/tests/structurePrinters/class/classDeclarationStructurePrinterTests.ts
@@ -34,7 +34,7 @@ describe("ClassDeclarationStructurePrinter", () => {
             name: "pPrivate",
           }, {
             scope: Scope.Protected,
-            name: "pProtected",
+            name: "p-Protected",
           }],
           ctors: [{}],
           methods: [{
@@ -45,10 +45,10 @@ describe("ClassDeclarationStructurePrinter", () => {
             name: "m2",
           }, {
             scope: Scope.Public,
-            name: "m3",
+            name: "m3-2",
           }],
-          getAccessors: [{ name: "g" }],
-          setAccessors: [{ name: "s" }],
+          getAccessors: [{ name: "g" }, { name: "g-2" }],
+          setAccessors: [{ name: "s" }, { name: "s-2" }],
         };
 
         doTest(
@@ -57,7 +57,7 @@ describe("ClassDeclarationStructurePrinter", () => {
     pNoKeyword;
     public pPublic;
     private pPrivate;
-    protected pProtected;
+    protected "p-Protected";
 
     constructor() {
     }
@@ -65,16 +65,22 @@ describe("ClassDeclarationStructurePrinter", () => {
     get g() {
     }
 
+    get "g-2"() {
+    }
+
     set s() {
     }
 
+    set "s-2"() {
+    }
+
     private m1() {
     }
 
     protected m2() {
     }
 
-    public m3() {
+    public "m3-2"() {
     }
 }`,
         );
diff --git a/packages/ts-morph/src/tests/structurePrinters/interface/interfaceDeclarationStructurePrinterTests.ts b/packages/ts-morph/src/tests/structurePrinters/interface/interfaceDeclarationStructurePrinterTests.ts
index 352c6fc0c..5ecf3fd83 100644
--- a/packages/ts-morph/src/tests/structurePrinters/interface/interfaceDeclarationStructurePrinterTests.ts
+++ b/packages/ts-morph/src/tests/structurePrinters/interface/interfaceDeclarationStructurePrinterTests.ts
@@ -32,5 +32,34 @@ describe("InterfaceDeclarationStructurePrinter", () => {
         doTest({ name: "I", extends: _ => {} }, `interface I {\n}`);
       });
     });
+
+    describe("props and methods", () => {
+      it("should write properties and methods", () => {
+        // todo: more tests
+        doTest(
+          {
+            name: "I",
+            properties: [{
+              name: "prop",
+              type: "string",
+            }, {
+              name: "prop-1",
+              type: "string",
+            }],
+            methods: [{
+              name: "method",
+            }, {
+              name: "method-1",
+            }],
+          },
+          `interface I {
+    prop: string;
+    "prop-1": string;
+    method();
+    "method-1"();
+}`,
+        );
+      });
+    });
   });
 });
diff --git a/packages/ts-morph/src/utils/WriterUtils.ts b/packages/ts-morph/src/utils/WriterUtils.ts
index 73dabc34b..335270ebc 100644
--- a/packages/ts-morph/src/utils/WriterUtils.ts
+++ b/packages/ts-morph/src/utils/WriterUtils.ts
@@ -1,4 +1,6 @@
+import { StringUtils } from "@ts-morph/common";
 import { CodeBlockWriter } from "../codeBlockWriter";
+import { isValidVariableName } from "./namingValidator";
 
 /** Utilities for code block writer. */
 export class WriterUtils {
@@ -19,4 +21,13 @@ export class WriterUtils {
     });
     return chars.join("");
   }
+
+  /* Adds quotes if structure is not a valid variable name
+   * AND the string is not enclosed in quotation marks */
+  static writePropertyName(writer: CodeBlockWriter, text: string) {
+    if (isValidVariableName(text) || StringUtils.isQuoted(text))
+      writer.write(text);
+    else
+      writer.quote(text);
+  }
 }
diff --git a/packages/ts-morph/src/utils/namingValidator.ts b/packages/ts-morph/src/utils/namingValidator.ts
index b7ba2d6b4..f36242789 100644
--- a/packages/ts-morph/src/utils/namingValidator.ts
+++ b/packages/ts-morph/src/utils/namingValidator.ts
@@ -5,12 +5,39 @@
  * Expression from https://stackoverflow.com/a/9337047
  */
 const reg =
-  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+
+// dprint-ignore
+const bannedNames = new Set([
+  "do", "if", "in", "for", "let", "new", "try", "var", "case", "else", "enum", "eval", "false", "null",
+  "this", "true", "void", "with", "break", "catch", "class", "const", "super", "throw", "while", "yield",
+  "delete", "export", "import", "public", "return", "static", "switch", "typeof", "default", "extends",
+  "finally", "package", "private", "continue", "debugger", "function", "arguments", "interface", "protected",
+  "implements", "instanceof"
+]);
 
 /**
  * Tests if a string is a valid Javascript variable name
  * according to ECMAScript 5.1 and Unicode 6.1
  */
 export function isValidVariableName(variableName: string): boolean {
-  return reg.test(variableName);
+  if (bannedNames.has(variableName))
+    return false;
+  if (isAlphaNumeric(variableName))
+    return true; // fast path
+  return reg.test(variableName); // slow path
+}
+
+function isAlphaNumeric(variableName: string): boolean {
+  for (let i = 0; i < variableName.length; i++) {
+    const ch = variableName.charCodeAt(i);
+    if (
+      !(ch >= 48 && ch <= 57) // Not 0-9
+      && !(ch >= 65 && ch <= 90) // Not A-Z
+      && !(ch >= 97 && ch <= 122) // Not a-z
+    ) {
+      return false;
+    }
+  }
+  return true;
 }