cptn-dflt-b-fall-thru-nrml.js (2616B)
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 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 a. Repeat for each CaseClause C in B 33 i. If foundInB is false, then 34 1. Let clauseSelector be the result of CaseSelectorEvaluation of 35 C. 36 [...] 37 3. Let foundInB be the result of performing Strict Equality 38 Comparison input === clauseSelector.[[value]]. 39 ii. If foundInB is true, then 40 [...] 41 8. If foundInB is true, return NormalCompletion(V). 42 9. Let R be the result of evaluating DefaultClause. 43 10. If R.[[value]] is not empty, let V = R.[[value]]. 44 11. If R is an abrupt completion, return Completion(UpdateEmpty(R, V)). 45 12. Repeat for each CaseClause C in B (NOTE this is another complete 46 iteration of the second CaseClauses) 47 a. Let R be the result of evaluating CaseClause C. 48 b. If R.[[value]] is not empty, let V = R.[[value]]. 49 c. If R is an abrupt completion, return Completion(UpdateEmpty(R, V)). 50 13. Return NormalCompletion(V). 51 ---*/ 52 53 assert.sameValue( 54 eval('1; switch ("a") { default: case "b": 2; case "c": 3; }'), 55 3, 56 'Non-empty value replaces previous non-empty value' 57 ); 58 assert.sameValue( 59 eval('4; switch ("a") { default: case "b": case "c": 5; }'), 60 5, 61 'Non-empty value replaces empty value' 62 ); 63 assert.sameValue( 64 eval('6; switch ("a") { default: case "b": 7; case "c": }'), 65 7, 66 'Empty value does not replace previous non-empty value' 67 ); 68 69 reportCompare(0, 0);