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introduce "strict" to pure_getters (#1795)

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This commit is contained in:
Alex Lam S.L
2017-04-07 13:31:58 +08:00
committed by GitHub
parent 281e882d27
commit 0f4cd73dcc
4 changed files with 59 additions and 16 deletions
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15
lib/compress.js
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@@ -71,7 +71,7 @@ function Compressor(options, false_by_default) {
negate_iife : !false_by_default,
passes : 1,
properties : !false_by_default,
pure_getters : false,
pure_getters : !false_by_default && "strict",
pure_funcs : null,
reduce_vars : !false_by_default,
screw_ie8 : true,
@@ -1165,7 +1165,13 @@ merge(Compressor.prototype, {
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
def(AST_Node, return_true);
function is_strict(compressor) {
return /strict/.test(compressor.option("pure_getters"));
}
def(AST_Node, function(compressor) {
return !is_strict(compressor);
});
def(AST_Null, return_true);
def(AST_Undefined, return_true);
def(AST_Constant, return_false);
@@ -1198,12 +1204,9 @@ merge(Compressor.prototype, {
def(AST_Seq, function(compressor) {
return this.cdr.may_eq_null(compressor);
});
def(AST_PropAccess, function(compressor) {
return !compressor.option("unsafe");
});
def(AST_SymbolRef, function(compressor) {
if (this.is_undefined) return true;
if (compressor.option("unsafe")) return false;
if (!is_strict(compressor)) return false;
var fixed = this.fixed_value();
return !fixed || fixed.may_eq_null(compressor);
});