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fix & extend join_vars for object assigments (#2781)

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This commit is contained in:
Alex Lam S.L
2018-01-14 17:11:31 +08:00
committed by GitHub
parent 2cab348341
commit 62a66dfff4
2 changed files with 130 additions and 1 deletions
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21
lib/compress.js
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@@ -1712,6 +1712,7 @@ merge(Compressor.prototype, {
do {
var node = exprs[0];
if (!(node instanceof AST_Assign)) break;
if (node.operator != "=") break;
if (!(node.left instanceof AST_PropAccess)) break;
var sym = node.left.expression;
if (!(sym instanceof AST_SymbolRef)) break;
@@ -1748,8 +1749,26 @@ merge(Compressor.prototype, {
statements[++j] = stat;
defs = stat;
}
} else if (stat instanceof AST_Exit) {
var exprs = join_object_assignments(prev, stat.value);
if (exprs) {
CHANGED = true;
if (exprs.length) {
stat.value = make_sequence(stat.value, exprs);
} else if (stat.value instanceof AST_Sequence) {
stat.value = stat.value.tail_node().left;
} else {
stat.value = stat.value.left;
}
}
statements[++j] = stat;
} else if (stat instanceof AST_For) {
if (prev instanceof AST_Var && (!stat.init || stat.init.TYPE == prev.TYPE)) {
var exprs = join_object_assignments(prev, stat.init);
if (exprs) {
CHANGED = true;
stat.init = exprs.length ? make_sequence(stat.init, exprs) : null;
statements[++j] = stat;
} else if (prev instanceof AST_Var && (!stat.init || stat.init.TYPE == prev.TYPE)) {
if (stat.init) {
prev.definitions = prev.definitions.concat(stat.init.definitions);
}