e26093f3d8
The ES.next drafts require that source code that matches the productions for let and const bindings outside the extended mode trigger early syntax errors. This CL adapts the parser / preparser accordingly under the harmony scoping flag. Summary: * Harmony scoping flag not set: Old semantics allowing const in classic mode with function level scope. Const binding in strict mode and let bindings in classic and strict mode trigger early syntax errors. * Harmony scoping is set: Use new harmony const and let in extended mode and old const in classic mode. This is to preserve compatibility with current web pages that already use non-standard implementations of const. An early syntax error is thrown on const in strict mode and on let in classic and strict mode. This depends on: http://codereview.chromium.org/8562002/ TEST=mjsunit/harmony/block-early-errors.js Review URL: http://codereview.chromium.org/8564001 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10079 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
56 lines
2.1 KiB
JavaScript
56 lines
2.1 KiB
JavaScript
// Copyright 2011 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --harmony-scoping
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function CheckException(e) {
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var string = e.toString();
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assertInstanceof(e, SyntaxError);
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assertTrue(string.indexOf("Illegal let") >= 0);
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}
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function Check(str) {
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try {
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eval("(function () { " + str + " })");
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assertUnreachable();
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} catch (e) {
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CheckException(e);
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}
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try {
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eval("(function () { { " + str + " } })");
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assertUnreachable();
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} catch (e) {
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CheckException(e);
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}
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}
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// Check for early syntax errors when using let
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// declarations outside of extended mode.
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Check("let x;");
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Check("let x = 1;");
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Check("let x, y;");
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