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330 lines
10 KiB
JavaScript
330 lines
10 KiB
JavaScript
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is JavaScript Engine testing utilities.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2007
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s): Jesse Ruderman
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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var gTestfile = 'regress-380237-04.js';
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//-----------------------------------------------------------------------------
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var BUGNUMBER = 380237;
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var summary = 'Generator expressions parenthesization test';
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var actual = '';
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var expect = '';
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/*
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Given that parentheization seems so fragile *and* the rules for where
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genexps are allowed keep changing, I thought it would be good to have
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a way to test that:
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1) unparenthesized genexps are allowed in some places and the
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decompilation is sane and not over-parenthesized
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2) unparenthesized genexps are disallowed in many places and when
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there are parens, the decompilation is sane and not over-parenthesized
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*/
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// |genexp| must have the exact same whitespace the decompiler uses
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genexp = "x * x for (x in [])";
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genexpParened = "(" + genexp + ")";
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genexpParenedTwice = "(" + genexpParened + ")";
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// Warning: be careful not to put [] around stuff, because that would
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// cause it to be treated as an array comprehension instead of a
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// generator expression!
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// Statements
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doesNotNeedParens(1, "if (xx) { }");
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needParens(2, "if (1, xx) { }");
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needParens(3, "if (xx, 1) { }");
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doesNotNeedParens(4, "do { } while (xx);");
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doesNotNeedParens(5, "while (xx) { }");
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doesNotNeedParens(6, "switch (xx) { }");
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doesNotNeedParens(7, "with (xx) { }");
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needParens(8, "switch (x) { case xx: }");
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needParens(9, "return xx;");
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needParens(10, "yield xx;");
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needParens(11, "for (xx;;) { }");
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needParens(12, "for (;xx;) { }", "function anonymous() {\n for (;;) {\n }\n}");
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needParens(13, "for (;;xx) { }");
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needParens(14, "for (i in xx) { }");
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needParens(15, "throw xx");
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needParens(16, "try { } catch (e if xx) { }");
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needParens(17, "let (x=3) xx");
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needParens(18, "let (x=xx) 3");
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// Function calls
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doesNotNeedParens(19, "f(xx);");
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needParens(20, "f(xx, 1);");
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needParens(21, "f(1, xx);");
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doesNotNeedParens(22, "/x/(xx);");
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needParens(23, "/x/(xx, 1);");
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needParens(24, "/x/(1, xx);");
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// eval is special and often confuses the decompiler.
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doesNotNeedParens(25, "eval(xx);");
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needParens(26, "eval(xx, 1);");
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needParens(27, "eval(1, xx);");
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// Expressions
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needParens(28, "xx;"); // ???
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needParens(29, "var g = xx;"); // ???
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needParens(30, "g += xx;");
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needParens(31, "xx();");
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needParens(32, "xx() = 3;");
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needParens(33, "a ? xx : c");
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needParens(34, "xx ? b : c");
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needParens(35, "a ? b : xx");
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needParens(36, "1 ? xx : c");
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needParens(37, "0 ? b : xx");
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needParens(38, "1 + xx");
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needParens(39, "xx + 1");
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needParens(40, "1, xx");
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doesNotNeedParens(41, "+(xx)");
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doesNotNeedParens(42, "!(xx)");
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needParens(43, "xx, 1");
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needParens(44, "[1, xx]");
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needParens(45, "[xx, 1]");
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needParens(46, "[#1=xx,3]");
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needParens(47, "[#1=xx,#1#]");
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needParens(48, "xx.p");
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needParens(49, "xx.@p");
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needParens(50, "typeof xx;");
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needParens(51, "void xx;");
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needParens(52, "({ a: xx })");
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needParens(53, "({ a: 1, b: xx })");
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needParens(54, "({ a: xx, b: 1 })");
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needParens(55, "({ a getter: xx })");
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needParens(56, "<x a={xx}/>");
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doesNotNeedParens(57, "new (xx);");
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doesNotNeedParens(58, "new a(xx);");
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// Generator expressions cannot be used as LHS, even though they're syntactic
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// sugar for something that looks a lot like an "lvalue return": (f() = 3).
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rejectLHS(59, "++ (xx);");
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rejectLHS(60, "delete xx;");
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rejectLHS(61, "delete (xx);");
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rejectLHS(62, "for (xx in []) { }");
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rejectLHS(63, "for ((xx) in []) { }");
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rejectLHS(64, "try { } catch(xx) { }");
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rejectLHS(65, "try { } catch([(xx)]) { }");
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rejectLHS(66, "xx += 3;");
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rejectLHS(67, "(xx) += 3;");
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rejectLHS(68, "xx = 3;");
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// Assignment
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rejectLHS(69, " (xx) = 3;");
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rejectLHS(70, "var (xx) = 3;");
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rejectLHS(71, "const (xx) = 3;");
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rejectLHS(72, "let (xx) = 3;");
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// Destructuring assignment
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rejectLHS(73, " [(xx)] = 3;");
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rejectLHS(74, "var [(xx)] = 3;");
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rejectLHS(75, "const [(xx)] = 3;");
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rejectLHS(76, "let [(xx)] = 3;");
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// Group assignment (Spidermonkey optimization for certain
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// destructuring assignments)
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rejectLHS(77, " [(xx)] = [3];");
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rejectLHS(78, "var [(xx)] = [3];");
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rejectLHS(79, "const [(xx)] = [3];");
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rejectLHS(80, "let [(xx)] = [3];");
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// Destructuring & group assignment for array comprehensions, just for kicks.
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rejectLHS(81, " [xx] = [3];");
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rejectLHS(82, "var [xx] = [3];");
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rejectLHS(83, "const [xx] = [3];");
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rejectLHS(84, "let [xx] = 3;");
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rejectLHS(85, " [xx] = 3;");
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rejectLHS(86, "var [xx] = 3;");
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rejectLHS(87, "const [xx] = 3;");
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rejectLHS(88, "let [xx] = 3;");
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// This is crazy, ambiguous, and/or buggy.
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// See https://bugzilla.mozilla.org/show_bug.cgi?id=380237#c23 et seq.
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//doesNotNeedParens("(yield xx);");
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print("Done!");
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function doesNotNeedParens(section, pat)
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{
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print("Testing section " + section + " pattern " + pat);
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var f, ft;
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sanityCheck(section, pat);
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expect = 'No Error';
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actual = '';
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ft = pat.replace(/xx/, genexp);
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try {
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f = new Function(ft);
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actual = 'No Error';
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} catch(e) {
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print("Unparenthesized genexp SHOULD have been accepted here!");
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actual = e + '';
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}
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reportCompare(expect, actual, summary + ': doesNotNeedParens section ' + section + ' pattern ' + pat);
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roundTripTest(section, f);
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// Make sure the decompilation is not over-parenthesized.
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var uf = "" + f;
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if (pat.indexOf("(xx)") != -1)
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overParenTest(section, f);
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// else
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// print("Skipping the over-parenthesization test, because I don't know how to test for over-parenthesization when the pattern doesn't have parens snugly around it.")
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}
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function needParens(section, pat, exp)
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{
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print("Testing section " + section + " pattern " + pat);
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var f, ft;
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sanityCheck(section, pat);
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expect = 'SyntaxError';
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actual = '';
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ft = pat.replace(/xx/, genexp);
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try {
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f = new Function(ft);
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print("Unparenthesized genexp should NOT have been accepted here!");
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} catch(e) {
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/* expected to throw */
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actual = e.name;
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}
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reportCompare(expect, actual, summary + ': needParens section ' + section + ' pattern ' + pat);
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expect = 'No Error';
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actual = '';
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ft = pat.replace(/xx/, genexpParened);
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try {
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f = new Function(ft);
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actual = 'No Error';
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} catch(e) {
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print("Yikes!");
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actual = e + '';
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}
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reportCompare(expect, actual, summary + ': needParens section ' + section + ' ft ' + ft);
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roundTripTest(section, f, exp);
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overParenTest(section, f, exp);
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}
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function rejectLHS(section, pat)
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{
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print("Testing section " + section + " pattern " + pat);
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// sanityCheck(pat); // because 'z' should be accepted as an LHS or binding
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var ft;
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expect = 'SyntaxError';
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actual = '';
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ft = pat.replace(/xx/, genexp)
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try {
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new Function(ft);
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print("That should have been a syntax error!");
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actual = 'No Error';
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} catch(e) {
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actual = e.name;
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}
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reportCompare(expect, actual, summary + ': rejectLHS section ' + section);
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}
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function overParenTest(section, f, exp)
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{
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var uf = "" + f;
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if (uf == exp)
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return;
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reportCompare(false, uf.indexOf(genexpParened) == -1, summary +
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': overParenTest genexp snugly in parentheses: section ' + section + ' uf ' + uf);
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if (uf.indexOf(genexpParened) != -1) {
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reportCompare(true, uf.indexOf(genexpParenedTwice) == -1, summary +
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': overParensTest decompilation should not be over-parenthesized: section ' + ' uf ' + uf);
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}
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}
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function sanityCheck(section, pat)
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{
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expect = '';
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actual = '';
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if (pat.indexOf("xx") == -1)
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{
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actual += "No 'xx' in this pattern? ";
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}
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var f, ft;
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ft = pat.replace(/xx/, "z");
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try {
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f = new Function(ft);
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} catch(e) {
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actual += "Yowzers! Probably a bogus test!";
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}
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reportCompare(expect, actual, summary + ': sanityCheck section ' + section + ' pattern ' + pat);
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}
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function roundTripTest(section, f, exp)
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{
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// Decompile
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var uf = "" + f;
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// Recompile
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expect = 'No Error';
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actual = '';
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var euf;
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try {
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euf = eval("(" + uf + ")");
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actual = 'No Error';
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reportCompare(expect, actual, summary + ': roundTripTest: section ' + section + ' uf ' + uf);
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} catch(e) {
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actual = e + '';
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reportCompare(expect, actual, summary + ': roundTripTest: section ' + section + ' uf ' + uf);
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return;
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}
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// Decompile again and make sure the decompilations match exactly.
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expect = exp || uf;
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actual = "" + euf;
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reportCompare(expect, actual, summary + ': roundTripTest no round-trip change: section ' + section);
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}
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