tor-browser

The Tor Browser
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cptn-no-dflt-match-final.js (2417B)

      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: Completion value when only the final case matches
      6 info: |
      7    SwitchStatement : switch ( Expression ) CaseBlock
      8 
      9    [...]
     10    8. Let R be the result of performing CaseBlockEvaluation of CaseBlock with
     11       argument switchValue.
     12    9. Set the running execution context’s LexicalEnvironment to oldEnv.
     13    10. Return R.
     14 
     15    13.12.9 Runtime Semantics: CaseBlockEvaluation
     16 
     17    CaseBlock : { CaseClauses }
     18 
     19    1. Let V = undefined.
     20    2. Let A be the List of CaseClause items in CaseClauses, in source text
     21       order.
     22    3. Let found be false.
     23    4. Repeat for each CaseClause C in A,
     24       a. If found is false, then
     25          i. Let clauseSelector be the result of CaseSelectorEvaluation of C.
     26          ii. If clauseSelector is an abrupt completion, then
     27              1. If clauseSelector.[[value]] is empty, return
     28                 Completion{[[type]]: clauseSelector.[[type]], [[value]]:
     29                 undefined, [[target]]: clauseSelector.[[target]]}.
     30              2. Else, return Completion(clauseSelector).
     31          iii. Let found be the result of performing Strict Equality Comparison
     32               input === clauseSelector.[[value]].
     33       b. If found is true, then
     34          i. Let R be the result of evaluating C.
     35          ii. If R.[[value]] is not empty, let V = R.[[value]].
     36          iii. If R is an abrupt completion, return Completion(UpdateEmpty(R,
     37               V)).
     38    5. Return NormalCompletion(V).
     39 ---*/
     40 
     41 assert.sameValue(
     42  eval('1; switch ("a") { case "a": }'),
     43  undefined,
     44  'empty StatementList (lone case)'
     45 );
     46 assert.sameValue(
     47  eval('2; switch ("a") { case "a": 3; }'),
     48  3,
     49  'non-empy StatementList (lone case)'
     50 );
     51 assert.sameValue(
     52  eval('4; switch ("b") { case "a": case "b": }'),
     53  undefined,
     54  'empty StatementList (following an empty case)'
     55 );
     56 assert.sameValue(
     57  eval('5; switch ("b") { case "a": case "b": 6; }'),
     58  6,
     59  'non-empty StatementList (following an empty case)'
     60 );
     61 assert.sameValue(
     62  eval('7; switch ("b") { case "a": 8; case "b": }'),
     63  undefined,
     64  'empty StatementList (following a non-empty case)'
     65 );
     66 assert.sameValue(
     67  eval('9; switch ("b") { case "a": 10; case "b": 11; }'),
     68  11,
     69  'non-empty StatementList (following a non-empty case)'
     70 );
     71 
     72 reportCompare(0, 0);