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compress undefined property names (#2811)

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- enforce property names as string
- handle `void 0` as `undefined` in `hoist_props` & `reduce_vars`
This commit is contained in:
Alex Lam S.L
2018-01-19 00:36:30 +08:00
committed by GitHub
parent 983e69128b
commit 082e004b87
6 changed files with 46 additions and 16 deletions
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21
lib/compress.js
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@@ -404,14 +404,15 @@ merge(Compressor.prototype, {
}
function read_property(obj, key) {
if (key instanceof AST_Constant) key = key.getValue();
if (key instanceof AST_Node) return null;
key = get_value(key);
if (key instanceof AST_Node) return;
var value;
if (obj instanceof AST_Array) {
var elements = obj.elements;
if (key == "length") return make_node_from_constant(elements.length, obj);
if (typeof key == "number" && key in elements) value = elements[key];
} else if (obj instanceof AST_Object) {
key = "" + key;
var props = obj.properties;
for (var i = props.length; --i >= 0;) {
var prop = props[i];
@@ -1855,6 +1856,18 @@ merge(Compressor.prototype, {
}));
};
function get_value(key) {
if (key instanceof AST_Constant) {
return key.getValue();
}
if (key instanceof AST_UnaryPrefix
&& key.operator == "void"
&& key.expression instanceof AST_Constant) {
return;
}
return key;
}
function is_undefined(node, compressor) {
return node.is_undefined
|| node instanceof AST_Undefined
@@ -3295,9 +3308,7 @@ merge(Compressor.prototype, {
if (node instanceof AST_PropAccess && node.expression instanceof AST_SymbolRef) {
var defs = defs_by_id[node.expression.definition().id];
if (defs) {
var key = node.property;
if (key instanceof AST_Node) key = key.getValue();
var def = defs.get(key);
var def = defs.get(get_value(node.property));
var sym = make_node(AST_SymbolRef, node, {
name: def.name,
scope: node.expression.scope,