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enhance if_return to handle return void... (#1977)

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fixes #512
This commit is contained in:
Alex Lam S.L
2017-05-20 15:58:46 +08:00
committed by GitHub
parent 5bf8d7e949
commit 58fae7dc07
4 changed files with 38 additions and 11 deletions
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19
lib/compress.js
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@@ -914,12 +914,12 @@ merge(Compressor.prototype, {
continue loop;
case stat instanceof AST_If:
if (stat.body instanceof AST_Return) {
var value = stat.body.value;
//---
// pretty silly case, but:
// if (foo()) return; return; ==> foo(); return;
if (((in_lambda && ret.length == 0)
|| (ret[0] instanceof AST_Return && !ret[0].value))
&& !stat.body.value && !stat.alternative) {
if ((in_lambda && ret.length == 0 || ret[0] instanceof AST_Return && !ret[0].value)
&& !value && !stat.alternative) {
CHANGED = true;
var cond = make_node(AST_SimpleStatement, stat.condition, {
body: stat.condition
@@ -929,7 +929,7 @@ merge(Compressor.prototype, {
}
//---
// if (foo()) return x; return y; ==> return foo() ? x : y;
if (ret[0] instanceof AST_Return && stat.body.value && ret[0].value && !stat.alternative) {
if (ret[0] instanceof AST_Return && value && ret[0].value && !stat.alternative) {
CHANGED = true;
stat = stat.clone();
stat.alternative = ret[0];
@@ -939,7 +939,7 @@ merge(Compressor.prototype, {
//---
// if (foo()) return x; [ return ; ] ==> return foo() ? x : undefined;
if (multiple_if_returns && (ret.length == 0 || ret[0] instanceof AST_Return)
&& stat.body.value && !stat.alternative && in_lambda) {
&& value && !stat.alternative && in_lambda) {
CHANGED = true;
stat = stat.clone();
stat.alternative = ret[0] || make_node(AST_Return, stat, {
@@ -949,8 +949,8 @@ merge(Compressor.prototype, {
continue loop;
}
//---
// if (foo()) return; [ else x... ]; y... ==> if (!foo()) { x...; y... }
if (!stat.body.value && in_lambda) {
// if (foo()) return [ void bar() ]; [ else x...; ] y... ==> if (!foo()) { x...; y... } else bar();
if (in_lambda && (!value || value instanceof AST_UnaryPrefix && value.operator == "void")) {
CHANGED = true;
stat = stat.clone();
stat.condition = stat.condition.negate(compressor);
@@ -959,11 +959,12 @@ merge(Compressor.prototype, {
stat.body = make_node(AST_BlockStatement, stat, {
body: body
});
stat.alternative = null;
stat.alternative = value ? make_node(AST_SimpleStatement, value, {
body: value.expression
}) : null;
ret = funs.concat([ stat.transform(compressor) ]);
continue loop;
}
//---
// if (a) return b; if (c) return d; e; ==> return a ? b : c ? d : void e;
//