cptn-dflt-fall-thru-nrml.js (2036B)
1 // Copyright (C) 2016 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 es6id: 13.12.11 5 description: > 6 Completion value when execution continues through multiple cases and ends 7 with a normal completion in the default case 8 info: | 9 SwitchStatement : switch ( Expression ) CaseBlock 10 11 [...] 12 8. Let R be the result of performing CaseBlockEvaluation of CaseBlock with 13 argument switchValue. 14 9. Set the running execution context’s LexicalEnvironment to oldEnv. 15 10. Return R. 16 17 13.12.9 Runtime Semantics: CaseBlockEvaluation 18 19 CaseBlock : { CaseClausesopt DefaultClause CaseClausesopt } 20 21 1. Let V = undefined. 22 2. Let A be the list of CaseClause items in the first CaseClauses, in 23 source text order. If the first CaseClauses is not present A is « ». 24 3. Let found be false. 25 4. Repeat for each CaseClause C in A 26 [...] 27 5. Let foundInB be false. 28 6. Let B be the List containing the CaseClause items in the second 29 CaseClauses, in source text order. If the second CaseClauses is not 30 present B is « ». 31 7. If found is false, then 32 [...] 33 8. If foundInB is true, return NormalCompletion(V). 34 9. Let R be the result of evaluating DefaultClause. 35 10. If R.[[value]] is not empty, let V = R.[[value]]. 36 11. If R is an abrupt completion, return Completion(UpdateEmpty(R, V)). 37 12. Repeat for each CaseClause C in B (NOTE this is another complete 38 iteration of the second CaseClauses) 39 [...] 40 13. Return NormalCompletion(V). 41 ---*/ 42 43 assert.sameValue( 44 eval('1; switch ("a") { case "a": 2; default: 3; }'), 45 3, 46 'Non-empty value replaces previous non-empty value' 47 ); 48 assert.sameValue( 49 eval('4; switch ("a") { case "a": default: 5; }'), 50 5, 51 'Non-empty value replaces empty value' 52 ); 53 assert.sameValue( 54 eval('6; switch ("a") { case "a": 7; default: }'), 55 7, 56 'Empty value does not replace previous non-empty value' 57 ); 58 59 reportCompare(0, 0);