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// Copyright 2008 Google Inc. All Rights Reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Test for const semantics.
function CheckException(e) {
var string = e.toString();
var index = string.indexOf(':');
assertTrue(index >= 0);
var name = string.slice(0, index);
assertTrue(string.indexOf("has already been declared") >= 0 ||
string.indexOf("redeclaration") >= 0);
if (name == 'SyntaxError') return 'TypeError';
return name;
}
function TestLocal(s,e) {
try {
return eval("(function(){" + s + ";return " + e + "})")();
} catch (x) {
return CheckException(x);
}
}
// NOTE: TestGlobal usually only tests the given string in the context
// of a global object in dictionary mode. This is because we use
// delete to get rid of any added properties.
function TestGlobal(s,e) {
// Collect the global properties before the call.
var properties = [];
for (var key in this) properties.push(key);
// Compute the result.
var result;
try {
var code = s + (e ? "; $$$result=" + e : "");
if (this.execScript) {
execScript(code);
} else {
this.eval(code);
}
// Avoid issues if $$$result is not defined by
// reading it through this.
result = this.$$$result;
} catch (x) {
result = CheckException(x);
}
// Get rid of any introduced global properties before
// returning the result.
for (var key in this) {
if (properties.indexOf(key) == -1) delete this[key];
}
return result;
}
function TestContext(s,e) {
try {
// Use a with-statement to force the system to do dynamic
// declarations of the introduced variables or constants.
with ({}) {
return eval(s + ";" + e);
}
} catch (x) {
return CheckException(x);
}
}
function TestAll(expected,s,opt_e) {
var e = "";
var msg = s;
if (opt_e) { e = opt_e; msg += "; " + opt_e; }
assertEquals(expected, TestLocal(s,e), "local:'" + msg + "'");
assertEquals(expected, TestGlobal(s,e), "global:'" + msg + "'");
assertEquals(expected, TestContext(s,e), "context:'" + msg + "'");
}
function TestConflict(def0, def1) {
// No eval.
TestAll("TypeError", def0 +'; ' + def1);
// Eval everything.
TestAll("TypeError", 'eval("' + def0 + '; ' + def1 + '")');
// Eval first definition.
TestAll("TypeError", 'eval("' + def0 +'"); ' + def1);
// Eval second definition.
TestAll("TypeError", def0 + '; eval("' + def1 + '")');
// Eval both definitions separately.
TestAll("TypeError", 'eval("' + def0 +'"); eval("' + def1 + '")');
}
// Test conflicting definitions.
TestConflict("const x", "var x");
TestConflict("const x = 0", "var x");
TestConflict("const x", "var x = 0");
TestConflict("const x = 0", "var x = 0");
TestConflict("var x", "const x");
TestConflict("var x = 0", "const x");
TestConflict("var x", "const x = 0");
TestConflict("var x = 0", "const x = 0");
TestConflict("const x = undefined", "var x");
TestConflict("const x", "var x = undefined");
TestConflict("const x = undefined", "var x = undefined");
TestConflict("var x = undefined", "const x");
TestConflict("var x", "const x = undefined");
TestConflict("var x = undefined", "const x = undefined");
TestConflict("const x = undefined", "var x = 0");
TestConflict("const x = 0", "var x = undefined");
TestConflict("var x = undefined", "const x = 0");
TestConflict("var x = 0", "const x = undefined");
TestConflict("const x", "function x() { }");
TestConflict("const x = 0", "function x() { }");
TestConflict("const x = undefined", "function x() { }");
TestConflict("function x() { }", "const x");
TestConflict("function x() { }", "const x = 0");
TestConflict("function x() { }", "const x = undefined");
TestConflict("const x, y", "var x");
TestConflict("const x, y", "var y");
TestConflict("const x = 0, y", "var x");
TestConflict("const x = 0, y", "var y");
TestConflict("const x, y = 0", "var x");
TestConflict("const x, y = 0", "var y");
TestConflict("const x = 0, y = 0", "var x");
TestConflict("const x = 0, y = 0", "var y");
TestConflict("var x", "const x, y");
TestConflict("var y", "const x, y");
TestConflict("var x", "const x = 0, y");
TestConflict("var y", "const x = 0, y");
TestConflict("var x", "const x, y = 0");
TestConflict("var y", "const x, y = 0");
TestConflict("var x", "const x = 0, y = 0");
TestConflict("var y", "const x = 0, y = 0");
// Test that multiple conflicts do not cause issues.
TestConflict("var x, y", "const x, y");
// Test that repeated const declarations throw redeclaration errors.
TestConflict("const x", "const x");
TestConflict("const x = 0", "const x");
TestConflict("const x", "const x = 0");
TestConflict("const x = 0", "const x = 0");
TestConflict("const x = undefined", "const x");
TestConflict("const x", "const x = undefined");
TestConflict("const x = undefined", "const x = undefined");
TestConflict("const x = undefined", "const x = 0");
TestConflict("const x = 0", "const x = undefined");
TestConflict("const x, y", "const x");
TestConflict("const x, y", "const y");
TestConflict("const x = 0, y", "const x");
TestConflict("const x = 0, y", "const y");
TestConflict("const x, y = 0", "const x");
TestConflict("const x, y = 0", "const y");
TestConflict("const x = 0, y = 0", "const x");
TestConflict("const x = 0, y = 0", "const y");
TestConflict("const x", "const x, y");
TestConflict("const y", "const x, y");
TestConflict("const x", "const x = 0, y");
TestConflict("const y", "const x = 0, y");
TestConflict("const x", "const x, y = 0");
TestConflict("const y", "const x, y = 0");
TestConflict("const x", "const x = 0, y = 0");
TestConflict("const y", "const x = 0, y = 0");
// Test that multiple const conflicts do not cause issues.
TestConflict("const x, y", "const x, y");
// Test that const inside loop behaves correctly.
var loop = "for (var i = 0; i < 3; i++) { const x = i; }";
TestAll(0, loop, "x");
TestAll(0, "var a,b,c,d,e,f,g,h; " + loop, "x");
// Test that const inside with behaves correctly.
TestAll(87, "with ({x:42}) { const x = 87; }", "x");
TestAll(undefined, "with ({x:42}) { const x; }", "x");
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