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fix corner case in collapse_vars (#3597)

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fixes #3596
This commit is contained in:
Alex Lam S.L
2019-11-19 02:30:52 +08:00
committed by GitHub
parent 02cc4a0d03
commit c289ba1139
3 changed files with 57 additions and 25 deletions
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27
lib/output.js
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@@ -711,16 +711,23 @@ function OutputStream(options) {
PARENS(AST_Sequence, function(output) {
var p = output.parent();
return p instanceof AST_Call // (foo, bar)() or foo(1, (2, 3), 4)
|| p instanceof AST_Unary // !(foo, bar, baz)
|| p instanceof AST_Binary // 1 + (2, 3) + 4 ==> 8
|| p instanceof AST_VarDef // var a = (1, 2), b = a + a; ==> b == 4
|| p instanceof AST_PropAccess // (1, {foo:2}).foo or (1, {foo:2})["foo"] ==> 2
|| p instanceof AST_Array // [ 1, (2, 3), 4 ] ==> [ 1, 3, 4 ]
|| p instanceof AST_ObjectProperty // { foo: (1, 2) }.foo ==> 2
|| p instanceof AST_Conditional /* (false, true) ? (a = 10, b = 20) : (c = 30)
* ==> 20 (side effect, set a := 10 and b := 20) */
;
// (foo, bar)() or foo(1, (2, 3), 4)
return p instanceof AST_Call
// !(foo, bar, baz)
|| p instanceof AST_Unary
// 1 + (2, 3) + 4 ==> 8
|| p instanceof AST_Binary
// var a = (1, 2), b = a + a; ==> b == 4
|| p instanceof AST_VarDef
// (1, {foo:2}).foo or (1, {foo:2})["foo"] ==> 2
|| p instanceof AST_PropAccess && p.expression === this
// [ 1, (2, 3), 4 ] ==> [ 1, 3, 4 ]
|| p instanceof AST_Array
// { foo: (1, 2) }.foo ==> 2
|| p instanceof AST_ObjectProperty
// (false, true) ? (a = 10, b = 20) : (c = 30)
// ==> 20 (side effect, set a := 10 and b := 20)
|| p instanceof AST_Conditional;
});
PARENS(AST_Binary, function(output) {