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enhance collapse_vars (#3616)

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This commit is contained in:
Alex Lam S.L
2019-12-01 02:31:04 +08:00
committed by GitHub
parent b866a23671
commit 0593892d6e
2 changed files with 350 additions and 7 deletions
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30
lib/compress.js
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@@ -1147,7 +1147,7 @@ merge(Compressor.prototype, {
&& (scan_lhs && lhs.equivalent_to(node)
|| scan_rhs && (hit_rhs = scan_rhs(node, this)))) {
if (stop_if_hit && (hit_rhs || !lhs_local || !replace_all)) {
abort = true;
if (!hit_rhs || !value_def) abort = true;
return node;
}
if (is_lhs(node, parent)) {
@@ -1541,14 +1541,27 @@ merge(Compressor.prototype, {
function find_stop(node, level) {
var parent = scanner.parent(level);
if (parent instanceof AST_Array) return value_def ? find_stop(parent, level + 1) : node;
if (parent instanceof AST_Assign) return node;
if (parent instanceof AST_Binary) {
if (!value_def || parent.left !== node) return node;
if (parent instanceof AST_Assign) {
if (!value_def) return node;
if (lhs.equivalent_to(parent.left)) return node;
if (get_rvalue(candidate).equivalent_to(parent.left)) return node;
return find_stop(parent, level + 1);
}
if (parent instanceof AST_Call) return node;
if (parent instanceof AST_Binary) {
if (!value_def) return node;
if (lazy_op[parent.operator] && parent.left !== node) {
var grandparent = scanner.parent(level + 1);
if (!(grandparent instanceof AST_Binary)) return node;
if (grandparent.operator != parent.operator) return node;
}
return find_stop(parent, level + 1);
}
if (parent instanceof AST_Call) return value_def ? parent : node;
if (parent instanceof AST_Case) return node;
if (parent instanceof AST_Conditional) return node;
if (parent instanceof AST_Conditional) {
if (!value_def || parent.condition !== node) return node;
return find_stop(parent, level + 1);
}
if (parent instanceof AST_Definitions) return find_stop_unused(parent, level + 1);
if (parent instanceof AST_Exit) return node;
if (parent instanceof AST_If) return node;
@@ -1562,7 +1575,10 @@ merge(Compressor.prototype, {
}
if (parent instanceof AST_SimpleStatement) return find_stop_unused(parent, level + 1);
if (parent instanceof AST_Switch) return node;
if (parent instanceof AST_Unary) return node;
if (parent instanceof AST_Unary) {
if (parent.operator == "delete") return node;
return value_def ? find_stop(parent, level + 1) : node;
}
if (parent instanceof AST_VarDef) return node;
return null;
}