block-conflicts.js 5.18 KB
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// Copyright 2011 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
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// Test for conflicting variable bindings.

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"use strict";

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function CheckException(e) {
  var string = e.toString();
  assertTrue(string.indexOf("has already been declared") >= 0 ||
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             string.indexOf("redeclaration") >= 0);
  return 'Conflict';
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}


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function TestGlobal(s,e) {
  try {
    return eval(s + e);
  } catch (x) {
    return CheckException(x);
  }
}


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function TestFunction(s,e) {
  try {
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    return eval("(function(){" + s + " return " + e + "})")();
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  } catch (x) {
    return CheckException(x);
  }
}


function TestBlock(s,e) {
  try {
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    return eval("(function(){ {" + s + "} return " + e + "})")();
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  } catch (x) {
    return CheckException(x);
  }
}

function TestAll(expected,s,opt_e) {
  var e = "";
  var msg = s;
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  if (opt_e) { e = opt_e; msg += opt_e; }
  assertEquals(expected === 'LocalConflict' ? 'NoConflict' : expected,
      TestGlobal(s,e), "global:'" + msg + "'");
  assertEquals(expected === 'LocalConflict' ? 'NoConflict' : expected,
      TestFunction(s,e), "function:'" + msg + "'");
  assertEquals(expected === 'LocalConflict' ? 'Conflict' : expected,
      TestBlock(s,e), "block:'" + msg + "'");
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}


function TestConflict(s) {
  TestAll('Conflict', s);
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  TestAll('Conflict', 'eval("' + s + '");');
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}

function TestNoConflict(s) {
  TestAll('NoConflict', s, "'NoConflict'");
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  TestAll('NoConflict', 'eval("' + s + '");', "'NoConflict'");
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}

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function TestLocalConflict(s) {
  TestAll('LocalConflict', s, "'NoConflict'");
  TestAll('NoConflict', 'eval("' + s + '");', "'NoConflict'");
}

var letbinds = [ "let x;",
                 "let x = 0;",
                 "let x = undefined;",
                 "let x = function() {};",
                 "let x, y;",
                 "let y, x;",
                 "const x = 0;",
                 "const x = undefined;",
                 "const x = function() {};",
                 "const x = 2, y = 3;",
                 "const y = 4, x = 5;",
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                 "class x { }",
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                 ];
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function forCompatible(bind) {
  return !bind.startsWith('class');
}
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var varbinds = [ "var x;",
                 "var x = 0;",
                 "var x = undefined;",
                 "var x = function() {};",
                 "var x, y;",
                 "var y, x;",
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                 ];
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var funbind = "function x() {}";
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for (var l = 0; l < letbinds.length; ++l) {
  // Test conflicting let/var bindings.
  for (var v = 0; v < varbinds.length; ++v) {
    // Same level.
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    TestConflict(letbinds[l] + varbinds[v]);
    TestConflict(varbinds[v] + letbinds[l]);
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    // Different level.
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    TestConflict(letbinds[l] + '{' + varbinds[v] + '}');
    TestConflict('{' + varbinds[v] +'}' + letbinds[l]);
    TestNoConflict(varbinds[v] + '{' + letbinds[l] + '}');
    TestNoConflict('{' + letbinds[l] + '}' + varbinds[v]);
    // For loop.
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    if (forCompatible(letbinds[l])) {
      TestConflict('for (' + letbinds[l] + '0;) {' + varbinds[v] + '}');
    }
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    TestNoConflict('for (' + varbinds[v] + '0;) {' + letbinds[l] + '}');
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  }

  // Test conflicting let/let bindings.
  for (var k = 0; k < letbinds.length; ++k) {
    // Same level.
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    TestConflict(letbinds[l] + letbinds[k]);
    TestConflict(letbinds[k] + letbinds[l]);
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    // Different level.
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    TestNoConflict(letbinds[l] + '{ ' + letbinds[k] + '}');
    TestNoConflict('{' + letbinds[k] +'} ' + letbinds[l]);
    // For loop.
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    if (forCompatible(letbinds[l])) {
      TestNoConflict('for (' + letbinds[l] + '0;) {' + letbinds[k] + '}');
    }
    if (forCompatible(letbinds[k])) {
      TestNoConflict('for (' + letbinds[k] + '0;) {' + letbinds[l] + '}');
    }
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  }

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  // Test conflicting function/let bindings.
  // Same level.
  TestConflict(letbinds[l] + funbind);
  TestConflict(funbind + letbinds[l]);
  // Different level.
  TestNoConflict(letbinds[l] + '{' + funbind + '}');
  TestNoConflict('{' + funbind + '}' + letbinds[l]);
  TestNoConflict(funbind + '{' + letbinds[l] + '}');
  TestNoConflict('{' + letbinds[l] + '}' + funbind);
  // For loop.
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  if (forCompatible(letbinds[l])) {
    TestNoConflict('for (' + letbinds[l] + '0;) {' + funbind + '}');
  }
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  // Test conflicting parameter/let bindings.
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  TestConflict('(function(x) {' + letbinds[l] + '})();');
}

// Test conflicting function/var bindings.
for (var v = 0; v < varbinds.length; ++v) {
  // Same level.
  TestLocalConflict(varbinds[v] + funbind);
  TestLocalConflict(funbind + varbinds[v]);
  // Different level.
  TestLocalConflict(funbind + '{' + varbinds[v] + '}');
  TestLocalConflict('{' + varbinds[v] +'}' + funbind);
  TestNoConflict(varbinds[v] + '{' + funbind + '}');
  TestNoConflict('{' + funbind + '}' + varbinds[v]);
  // For loop.
  TestNoConflict('for (' + varbinds[v] + '0;) {' + funbind + '}');
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}

// Test conflicting catch/var bindings.
for (var v = 0; v < varbinds.length; ++v) {
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  TestNoConflict('try {} catch(x) {' + varbinds[v] + '}');
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}

// Test conflicting parameter/var bindings.
for (var v = 0; v < varbinds.length; ++v) {
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  TestNoConflict('(function (x) {' + varbinds[v] + '})();');
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}
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// Test conflicting parameter/function bindings.
TestNoConflict('(function (x) {' + funbind + '})();');