tor-browser

prettyFast.spec.js (11078B)

---

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */

/*
* Copyright 2013 Mozilla Foundation and contributors
* Licensed under the New BSD license. See LICENSE.md or:
* http://opensource.org/licenses/BSD-2-Clause
*/
import { prettyFast } from "../pretty-fast";
import { SourceMapConsumer } from "devtools/client/shared/vendor/source-map/source-map";

const cases = [
 {
   name: "Simple function",
   input: "function foo() { bar(); }",
 },
 {
   name: "Nested function",
   input: "function foo() { function bar() { debugger; } bar(); }",
 },
 {
   name: "Immediately invoked function expression",
   input: "(function(){thingy()}())",
 },
 {
   name: "Single line comment",
   input: `
   // Comment
   function foo() { bar(); }`,
 },
 {
   name: "Multi line comment",
   input: `
   /* Comment
   more comment */
   function foo() { bar(); }
   `,
 },
 { name: "Null assignment", input: "var i=null;" },
 { name: "Undefined assignment", input: "var i=undefined;" },
 { name: "Void 0 assignment", input: "var i=void 0;" },
 {
   name: "This property access",
   input: "var foo=this.foo;\n",
 },

 {
   name: "True assignment",
   input: "var foo=true;\n",
 },

 {
   name: "False assignment",
   input: "var foo=false;\n",
 },

 {
   name: "For loop",
   input: "for (var i = 0; i < n; i++) { console.log(i); }",
 },

 {
   name: "for..of loop",
   input: "for (const x of [1,2,3]) { console.log(x) }",
 },

 {
   name: "String with semicolon",
   input: "var foo = ';';\n",
 },

 {
   name: "String with quote",
   input: 'var foo = "\'";\n',
 },

 {
   name: "Function calls",
   input: "var result=func(a,b,c,d);",
 },

 {
   name: "Regexp",
   input: "var r=/foobar/g;",
 },

 {
   name: "In operator",
   input: "if(foo in bar){doThing()}",
   output: "if (foo in bar) {\n" + "  doThing()\n" + "}\n",
 },
 {
   name: "With statement",
   input: "with(obj){crock()}",
 },
 {
   name: "New expression",
   input: "var foo=new Foo();",
 },
 {
   name: "Continue/break statements",
   input: "while(1){if(x){continue}if(y){break}if(z){break foo}}",
 },
 {
   name: "Instanceof",
   input: "var a=x instanceof y;",
 },
 {
   name: "Binary operators",
   input: "var a=5*30;var b=5>>3;",
 },
 {
   name: "Delete",
   input: "delete obj.prop;",
 },

 {
   name: "Try/catch/finally statement",
   input: "try{dangerous()}catch(e){handle(e)}finally{cleanup()}",
 },
 {
   name: "If/else statement",
   input: "if(c){then()}else{other()}",
 },
 {
   name: "If/else without curlies",
   input: "if(c) a else b",
 },
 {
   name: "Objects",
   input: `
     var o={a:1,
     b:2};`,
 },
 {
   name: "Do/while loop",
   input: "do{x}while(y)",
 },
 {
   name: "Arrays",
   input: "var a=[1,2,3];",
 },
 {
   name: "Arrays and spread operator",
   input: "var a=[1,...[2,3],...[], 4];",
 },
 {
   name: "Empty object/array literals",
   input: `let a=[];const b={};c={...{},d: 42};for(let x of []){for(let y in {}){}}`,
 },
 {
   name: "Code that relies on ASI",
   input: `
          var foo = 10
          var bar = 20
          function g() {
            a()
            b()
          }`,
 },
 {
   name: "Ternary operator",
   input: "bar?baz:bang;",
 },
 {
   name: "Switch statements",
   input: "switch(x){case a:foo();break;default:bar()}",
 },

 {
   name: "Multiple single line comments",
   input: `function f() {
            // a
            // b
            // c
          }`,
 },
 {
   name: "Indented multiline comment",
   input: `function foo() {
            /**
             * java doc style comment
             * more comment
             */
            bar();
          }`,
 },
 {
   name: "ASI return",
   input: `function f() {
            return
            {}
          }`,
 },
 {
   name: "Non-ASI property access",
   input: `[1,2,3]
          [0]`,
 },
 {
   name: "Non-ASI in",
   input: `'x'
          in foo`,
 },

 {
   name: "Non-ASI function call",
   input: `f
          ()`,
 },
 {
   name: "Non-ASI new",
   input: `new
          F()`,
 },
 {
   name: "Getter and setter literals",
   input: "var obj={get foo(){return this._foo},set foo(v){this._foo=v}}",
 },
 {
   name: "Escaping backslashes in strings",
   input: "'\\\\'\n",
 },
 {
   name: "Escaping carriage return in strings",
   input: "'\\r'\n",
 },
 {
   name: "Escaping tab in strings",
   input: "'\\t'\n",
 },
 {
   name: "Escaping vertical tab in strings",
   input: "'\\v'\n",
 },
 {
   name: "Escaping form feed in strings",
   input: "'\\f'\n",
 },
 {
   name: "Escaping null character in strings",
   input: "'\\0'\n",
 },
 {
   name: "Escaping single quote character in strings",
   input: "'\\''\n",
 },
 {
   name: "Escaping backslashes in template strings",
   input: "`\\\\`\n",
 },
 {
   name: "Escaping carriage return in template strings",
   input: "`\\r`\n",
 },
 {
   name: "Escaped line feed in template strings",
   input: "`\\n`\n",
 },
 {
   name: "Raw line feed in template strings",
   input: "`\n`\n",
 },
 {
   name: "Escaping tab in template strings",
   input: "`\\t`\n",
 },
 {
   name: "Escaping vertical tab in template strings",
   input: "`\\v`\n",
 },
 {
   name: "Escaping form feed in template strings",
   input: "`\\f`\n",
 },
 {
   name: "Escaping null character in template strings",
   input: "`\\0`\n",
 },
 {
   name: "Escaping backtick character in template strings",
   input: "`\\``\n",
 },
 {
   name: "Bug 977082 - space between grouping operator and dot notation",
   input: `JSON.stringify(3).length;
          ([1,2,3]).length;
          (new Date()).toLocaleString();`,
 },
 {
   name: "Bug 975477 don't move end of line comments to next line",
   input: `switch (request.action) {
            case 'show': //$NON-NLS-0$
              if (localStorage.hideicon !== 'true') { //$NON-NLS-0$
                chrome.pageAction.show(sender.tab.id);
              }
              break;
            case 'hide': /*Multiline
              Comment */
              break;
            default:
              console.warn('unknown request'); //$NON-NLS-0$
              // don't respond if you don't understand the message.
              return;
          }`,
 },
 {
   name: "Const handling",
   input: "const d = 'yes';\n",
 },
 {
   name: "Let handling without value",
   input: "let d;\n",
 },
 {
   name: "Let handling with value",
   input: "let d = 'yes';\n",
 },
 {
   name: "Template literals",
   // issue in acorn
   input: "`abc${JSON.stringify({clas: 'testing'})}def`;{a();}",
 },
 {
   name: "Class handling",
   input: "class  Class{constructor(){}}",
 },
 {
   name: "Subclass handling",
   input: "class  Class  extends  Base{constructor(){}}",
 },
 {
   name: "Unnamed class handling",
   input: "let unnamed=class{constructor(){}}",
 },
 {
   name: "Named class handling",
   input: "let unnamed=class Class{constructor(){}}",
 },
 {
   name: "Class extension within a function",
   input: "(function() {  class X extends Y { constructor() {} }  })()",
 },
 {
   name: "Bug 1261971 - indentation after switch statement",
   input: "{switch(x){}if(y){}done();}",
 },
 {
   name: "Bug 1206633 - spaces in for of",
   input: "for (let tab of tabs) {}",
 },
 {
   name: "Bug pretty-sure-3 - escaping line and paragraph separators",
   input: "x = '\\u2029\\u2028';",
 },
 {
   name: "Bug pretty-sure-4 - escaping null character before digit",
   input: "x = '\\u00001';",
 },
 {
   name: "Bug pretty-sure-5 - empty multiline comment shouldn't throw exception",
   input: `{
          /*
          */
            return;
          }`,
 },
 {
   name: "Bug pretty-sure-6 - inline comment shouldn't move parenthesis to next line",
   input: `return /* inline comment */ (
            1+1);`,
 },
 {
   name: "Bug pretty-sure-7 - accessing a literal number property requires a space",
   input: "0..toString()+x.toString();",
 },
 {
   name: "Bug pretty-sure-8 - return and yield only accept arguments when on the same line",
   input: `{
            return
            (x)
            yield
            (x)
            yield
            *x
          }`,
 },
 {
   name: "Bug pretty-sure-9 - accept unary operator at start of file",
   input: "+ 0",
 },
 {
   name: "Stack-keyword property access",
   input: "foo.a=1.1;foo.do.switch.case.default=2.2;foo.b=3.3;\n",
 },
 {
   name: "Dot handling with let which is identifier name",
   input: "y.let.let = 1.23;\n",
 },
 {
   name: "Dot handling with keywords which are identifier name",
   input: "y.await.break.const.delete.else.return.new.yield = 1.23;\n",
 },
 {
   name: "Optional chaining parsing support",
   input: "x?.y?.z?.['a']?.check();\n",
 },
 {
   name: "Private fields parsing support",
   input: `
     class MyClass {
       constructor(a) {
         this.#a = a;this.#b = Math.random();this.ab = this.#getAB();
       }
       #a
       #b = "default value"
       static #someStaticPrivate
       #getA() {
         return this.#a;
       }
       #getAB() {
         return this.#getA()+this.
           #b
       }
     }
   `,
 },
 {
   name: "Long parenthesis",
   input: `
     if (thisIsAVeryLongVariable && thisIsAnotherOne || yetAnotherVeryLongVariable) {
       (thisIsAnotherOne = thisMayReturnNull() || "hi", thisIsAVeryLongVariable = 42, yetAnotherVeryLongVariable && doSomething(true /* do it well */,thisIsAVeryLongVariable, thisIsAnotherOne, yetAnotherVeryLongVariable))
     }
     for (let thisIsAnotherVeryLongVariable = 0; i < thisIsAnotherVeryLongVariable.length; thisIsAnotherVeryLongVariable++) {}
     const x = ({thisIsAnotherVeryLongPropertyName: "but should not cause the paren to be a line delimiter"})
   `,
 },
 {
   name: "Fat arrow function",
   input: `
     const a = () => 42
     addEventListener("click", e => { return false });
     const sum = (c,d) => c+d
   `,
 },
];

const includesOnly = cases.find(({ only }) => only);

for (const { name, input, only, skip } of cases) {
 if ((includesOnly && !only) || skip) {
   continue;
 }
 // Wrapping name into a string to avoid jest/valid-title failures
 test(`${name}`, async () => {
   const actual = prettyFast(input, {
     indent: "  ",
     url: "test.js",
   });

   expect(actual.code).toMatchSnapshot();

   const smc = await new SourceMapConsumer(actual.map.toJSON());
   const mappings = [];
   smc.eachMapping(
     ({ generatedColumn, generatedLine, originalColumn, originalLine }) => {
       mappings.push(
         `(${originalLine}, ${originalColumn}) -> (${generatedLine}, ${generatedColumn})`
       );
     }
   );
   expect(mappings).toMatchSnapshot();
 });
}