add parser tests

parser-test/README.md

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+# Parser Tests
+
+This directory contains tests designed for parsers. There are three directories of tests:
+
+- `pass/`, which contains syntactically valid ECMAScript programs,
+- `early/`, which contains programs which match the grammar of ECMAScript but which trigger early errors, and
+- `fail/`, which contains files which do not match the grammar of ECMAScript.
+
+A fourth directory, `pass-explicit/`, contains alternative versions of the programs in `pass/`, for reasons discussed below.
+
+Note that these tests are not intended to be evaluated, only parsed. Most would throw an error if run. Because they are testing syntax without depending on a functioning `eval()`, they include no metadata; each file is a utf8-encoded sequence of bytes which is to be parsed in full. The file `LICENSES.md` gives the origin and license of each file.
+
+
+## Equivalence tests
+
+Every file in `pass/` has a corresponding file in `pass-explicit/` of the same name. The explicit version (in `pass-explicit/`) is intended to appear as a human might write it, with parentheses included where there could conceivably be unclear precedence.
+
+The two versions of each file should be parsed to structures which are equivalent excepting unnecessary whitespace, comments, grouping parentheses, and semicolons.
+
+
+## Contributing
+
+New `pass/` and `early/` tests should be normalized using the NPM module [normalize-parser-test](https://www.npmjs.com/package/normalize-parser-test). `pass/` tests should additionally have an explicit version created using the provided `node.js` program `make-explicit.js`, which requires node v5 or later.
+
+Add copyright information for new tests to `licenses.md`.
+
+## Sample consumer
+
+Below is a `node.js` program which checks that a particular choice of parser has the correct behavior for all of the tests in this directory. Note that a parser which does not distinguish between early errors and other invalid syntax should treat the tests in `early/` just as they would the tests in `fail/`.
+
+```js
+const fs = require('fs');
+const shift = require('shift-parser');
+const assert = require('assert');
+
+function parse(src, {isModule, earlyErrors}) {
+  (isModule ? shift.parseModule : shift.parseScript)(src, {earlyErrors});
+}
+
+let passExcludes = [];
+let failExcludes = [];
+let earlyExcludes = [
+  '557.script.js',
+  '558.script.js',
+  '559.script.js',
+  '560.script.js',
+  '561.script.js',
+  '563.script.js',
+  '564.script.js',
+  '565.script.js',
+  '566.script.js',
+  '567.script.js',
+  '568.script.js',
+  '569.script.js',
+  '570.script.js',
+  '571.script.js',
+  '572.script.js',
+  '574.script.js',
+  '575.script.js',
+  '576.script.js',
+  '577.script.js',
+  '578.script.js',
+  '579.script.js',
+  '580.script.js',
+  '581.script.js',
+  '582.script.js',
+  '583.script.js',
+  '585.script.js',
+  '586.script.js',
+  '587.script.js',
+  '588.script.js',
+  '589.script.js',
+  '590.script.js',
+  '591.script.js',
+  '592.script.js',
+  '593.script.js',
+  '594.script.js',
+  '596.script.js',
+  '597.script.js',
+  '598.script.js',
+  '599.script.js',
+  '600.script.js',
+  '601.script.js',
+  '602.script.js',
+];
+
+fs.readdirSync('parser-test/pass').filter(f => !passExcludes.includes(f)).forEach(f => {
+  let firstTree, secondTree;
+  assert.doesNotThrow(() => {
+    firstTree = parse(
+      fs.readFileSync(`parser-test/pass/${f}`, 'utf8'),
+      {isModule: f.match('.module.js'), earlyErrors: true}
+    );
+  });
+  assert.doesNotThrow(() => {
+    secondTree = parse(
+      fs.readFileSync(`parser-test/pass-explicit/${f}`, 'utf8'),
+      {isModule: f.match('.module.js'), earlyErrors: true}
+    );
+  });
+  assert.deepStrictEqual(firstTree, secondTree);
+});
+
+fs.readdirSync('parser-test/fail').filter(f => !failExcludes.includes(f)).forEach(f => {
+  assert.throws(() => {
+    parse(
+      fs.readFileSync(`parser-test/fail/${f}`, 'utf8'),
+      {isModule: f.match('.module.js'), earlyErrors: false}
+    );
+  });
+});
+
+fs.readdirSync('parser-test/early').filter(f => !earlyExcludes.includes(f)).forEach(f => {
+  assert.doesNotThrow(() => {
+    parse(
+      fs.readFileSync(`parser-test/early/${f}`, 'utf8'),
+      {isModule: f.match('.module.js'), earlyErrors: false}
+    );
+  });
+  assert.throws(() => {
+    parse(
+      fs.readFileSync(`parser-test/early/${f}`, 'utf8'),
+      {isModule: f.match('.module.js'), earlyErrors: true}
+    );
+  });
+});
+```

parser-test/early/0.script.js

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+break

parser-test/early/1.script.js

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+continue

parser-test/early/10.script.js

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+(function () { 'use strict'; delete a; }())

parser-test/early/100.script.js

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+let let;

parser-test/early/101.script.js

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+"use strict"; const let = 1;

parser-test/early/102.script.js

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+var a = new.target;

parser-test/early/103.script.js

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+({ get __proto(){}, "__proto__": null, __proto__: null, })

parser-test/early/104.script.js

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+({ __proto__: null, "__proto__": null })

parser-test/early/105.script.js

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+({ __proto__: null, __proto__: null })

parser-test/early/106.script.js

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+({ "__proto__": null, __proto__: null })

parser-test/early/107.script.js

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+({ "__proto__": null, '__proto__': null })

parser-test/early/108.script.js

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+({ set __proto__(a){}, "__proto__": null, __proto__: null, })

parser-test/early/109.script.js

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+var a = super();

parser-test/early/11.script.js

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+(function () { 'use strict'; with (a); }())

parser-test/early/110.script.js

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+function* a() { (b = yield 1) => {} }

parser-test/early/111.script.js

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+"use strict"; function *a(){ var b = function yield(){}; }

parser-test/early/112.script.js

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+"use strict"; function *a() { var b = function(yield) {} }

parser-test/early/113.script.js

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+"use strict"; ([yield] = a)

parser-test/early/114.script.js

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+"use strict"; (a = yield) => {}

parser-test/early/115.script.js

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+"use strict"; (yield) => 1

parser-test/early/116.script.js

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+"use strict"; var { a: yield } = b;

parser-test/early/117.script.js

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+"use strict"; try {} catch (yield) {}

parser-test/early/118.script.js

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+"use strict"; function a(yield) {}

parser-test/early/119.script.js

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+"use strict"; function a() { yield }

parser-test/early/12.script.js

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+function a() {'use strict'; var eval = 1; }

parser-test/early/120.script.js

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+"use strict"; let yield = 1;

parser-test/early/121.script.js

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+"use strict"; function a(...yield) {}

parser-test/early/122.script.js

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+"use strict"; var yield;

parser-test/early/123.script.js

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+const a = 1, b;

parser-test/early/124.script.js

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+const a, b = 1;

parser-test/early/125.script.js

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+function a() { "use strict"; var yield; }

parser-test/early/126.script.js

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+function a() { "use strict"; var let; }

parser-test/early/127.script.js

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+__proto__: __proto__: 1;

parser-test/early/128.script.js

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+"use strict"; function a(__proto__, __proto__) { }

parser-test/early/129.script.js

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+a = { __proto__: 1, __proto__: 2 }

parser-test/early/13.script.js

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+function a() {'use strict'; var arguments = 1; }

parser-test/early/130.script.js

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+class a {static prototype(){}}

parser-test/early/131.script.js

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+class a {static "prototype"(){}}

parser-test/early/132.script.js

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+class a {get constructor(){}}

parser-test/early/133.script.js

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+class a {set constructor(b){}}

parser-test/early/134.script.js

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+class a {constructor(){} "constructor"(){}}

parser-test/early/135.script.js

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+class a {b(enum){}}

parser-test/early/136.script.js

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+class a {static [static](){};}

parser-test/early/137.script.js

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+function a() { "use strict"; implements = 1; }

parser-test/early/138.script.js

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+function a() { "use strict"; interface = 1; }

parser-test/early/139.script.js

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+function a() { "use strict"; let = 1; }

parser-test/early/14.script.js

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+function a() {'use strict'; try { } catch (eval) { } }

parser-test/early/140.script.js

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+function a() { "use strict"; package = 1; }

parser-test/early/141.script.js

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+function a() { "use strict"; private = 1; }

parser-test/early/142.script.js

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+function a() { "use strict"; protected = 1; }

parser-test/early/143.script.js

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+function a() { "use strict"; public = 1; }

parser-test/early/144.script.js

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+function a() { "use strict"; static = 1; }

parser-test/early/145.script.js

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+function a() { "use strict"; yield = 1; }

parser-test/early/146.script.js

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+"use strict"; for (a in let) {}

parser-test/early/147.module.js

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+export { a }

parser-test/early/148.module.js

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+export { a, b }

parser-test/early/149.module.js

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+export { a as default }

parser-test/early/15.script.js

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+function a() {'use strict'; try { } catch (arguments) { } }

parser-test/early/150.module.js

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+export { a, b as c }

parser-test/early/151.script.js

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+"use strict"; (class a {constructor() { super() }})

parser-test/early/152.script.js

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+"use strict"; (class a { static constructor() { super() }})

parser-test/early/153.script.js

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+function a(b, { b }){}

parser-test/early/154.script.js

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+(function () {
+    {
+        function a() {
+            b.c('d');
+        }
+        function a() {
+            b.c('e');
+        }
+        a();
+    }
+}());

parser-test/early/155.script.js

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+function a() {
+    b.c('d');
+}
+function a() {
+    b.c('e');
+}
+{
+    function a() {
+        b.c('d');
+    }
+    function a() {
+        b.c('e');
+    }
+}

parser-test/early/156.script.js

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+// Do not optimize this pattern
+function a() {
+    b.c('d');
+}
+
+{
+    function a() {
+        b.c('d');
+    }
+    a();
+    function a() {
+        b.c('e');
+    }
+}
+
+a();
+
+function a() {
+    b.c('e');
+}

parser-test/early/157.script.js

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+function a(b, b) {'use strict';}

parser-test/early/158.script.js

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+"use strict";
+function a([a,a]){ }
+function a([a,...a]){ }
+function a([{a},...a]){ }

parser-test/early/159.script.js

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+class a {b(eval){}}

parser-test/early/16.script.js

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+function a() {'use strict'; eval = 1; }

parser-test/early/160.module.js

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+export {a as default};

parser-test/early/161.module.js

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+export {a as b};

parser-test/early/162.module.js

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+export {a as default, b};

parser-test/early/163.module.js

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+export {a};

parser-test/early/164.module.js

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+export {a, b,};

parser-test/early/165.module.js

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+export {a, b};

parser-test/early/166.script.js

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+function *a() { (b = yield) => {} }

parser-test/early/167.script.js

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+function *a(b = yield){}

parser-test/early/168.script.js

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+'use strict'; ({arguments} = 1);

parser-test/early/169.script.js

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+'use strict'; ({arguments = 1} = 2);

parser-test/early/17.script.js

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+function a() {'use strict'; arguments = 1; }

parser-test/early/170.script.js

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+{ let a; let a; }

parser-test/early/171.script.js

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+{ let a; const a = 1; }

parser-test/early/172.script.js

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+{ const a = 1; let a; }

parser-test/early/173.script.js

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+{ const a = 1; const a = 2; }

parser-test/early/174.script.js

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+{ function a(){} function a(){} }

parser-test/early/175.script.js

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+{ function a(){} function* a(){} }

parser-test/early/176.script.js

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+{ let a; function a(){} }

parser-test/early/177.script.js

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+{ const a = 1; function a(){} }

parser-test/early/178.script.js

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+{ let a; var a; }

parser-test/early/179.script.js

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+{ let a; { var a; } }