mirror of https://github.com/tc39/test262.git
71 lines
2.3 KiB
JavaScript
71 lines
2.3 KiB
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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es6id: 13.12.11
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description: Completion value when only the final case matches
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info: >
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SwitchStatement : switch ( Expression ) CaseBlock
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[...]
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8. Let R be the result of performing CaseBlockEvaluation of CaseBlock with
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argument switchValue.
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9. Set the running execution context’s LexicalEnvironment to oldEnv.
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10. Return R.
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13.12.9 Runtime Semantics: CaseBlockEvaluation
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CaseBlock : { CaseClauses }
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1. Let V = undefined.
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2. Let A be the List of CaseClause items in CaseClauses, in source text
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order.
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3. Let found be false.
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4. Repeat for each CaseClause C in A,
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a. If found is false, then
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i. Let clauseSelector be the result of CaseSelectorEvaluation of C.
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ii. If clauseSelector is an abrupt completion, then
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1. If clauseSelector.[[value]] is empty, return
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Completion{[[type]]: clauseSelector.[[type]], [[value]]:
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undefined, [[target]]: clauseSelector.[[target]]}.
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2. Else, return Completion(clauseSelector).
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iii. Let found be the result of performing Strict Equality Comparison
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input === clauseSelector.[[value]].
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b. If found is true, then
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i. Let R be the result of evaluating C.
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ii. If R.[[value]] is not empty, let V = R.[[value]].
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iii. If R is an abrupt completion, return Completion(UpdateEmpty(R,
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V)).
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5. Return NormalCompletion(V).
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---*/
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assert.sameValue(
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eval('1; switch ("a") { case "a": }'),
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undefined,
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'empty StatementList (lone case)'
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);
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assert.sameValue(
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eval('2; switch ("a") { case "a": 3; }'),
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3,
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'non-empy StatementList (lone case)'
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);
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assert.sameValue(
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eval('4; switch ("b") { case "a": case "b": }'),
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undefined,
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'empty StatementList (following an empty case)'
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);
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assert.sameValue(
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eval('5; switch ("b") { case "a": case "b": 6; }'),
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6,
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'non-empty StatementList (following an empty case)'
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);
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assert.sameValue(
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eval('7; switch ("b") { case "a": 8; case "b": }'),
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undefined,
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'empty StatementList (following a non-empty case)'
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);
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assert.sameValue(
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eval('9; switch ("b") { case "a": 10; case "b": 11; }'),
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11,
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'non-empty StatementList (following a non-empty case)'
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);
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