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output optimal representations of NaN & Infinity (#1723)

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- move these optimisations out from `Compressor` to `OutputStream`
- fixes behaviour inconsistency when running uglified code from global or module levels due to redefinition
This commit is contained in:
Alex Lam S.L
2017-03-29 18:31:55 +08:00
committed by GitHub
parent fef0bf9ee0
commit 09f77c7d4d
7 changed files with 137 additions and 44 deletions
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19
lib/output.js
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@@ -592,6 +592,13 @@ function OutputStream(options) {
|| p instanceof AST_Call && p.expression === this;
});
PARENS([ AST_Infinity, AST_NaN ], function(output){
var p = output.parent();
return p instanceof AST_PropAccess && p.expression === this
|| p instanceof AST_Call && p.expression === this
|| p instanceof AST_Unary && p.operator != "+" && p.operator != "-";
});
PARENS(AST_Seq, function(output){
var p = output.parent();
return p instanceof AST_Call // (foo, bar)() or foo(1, (2, 3), 4)
@@ -1254,10 +1261,18 @@ function OutputStream(options) {
});
DEFPRINT(AST_Hole, noop);
DEFPRINT(AST_Infinity, function(self, output){
output.print("Infinity");
output.print("1");
output.space();
output.print("/");
output.space();
output.print("0");
});
DEFPRINT(AST_NaN, function(self, output){
output.print("NaN");
output.print("0");
output.space();
output.print("/");
output.space();
output.print("0");
});
DEFPRINT(AST_This, function(self, output){
output.print("this");