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enhance join_vars (#5824)

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closes #5790
This commit is contained in:
Alex Lam S.L
2024-06-05 13:46:11 +03:00
committed by GitHub
parent aa7c3389e6
commit ffe0fe7762
2 changed files with 140 additions and 10 deletions
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52
lib/compress.js
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@@ -4222,16 +4222,25 @@ Compressor.prototype.compress = function(node) {
if (value.left instanceof AST_SymbolRef) names.set(value.left.name, true);
value = value.right;
}
if (!(value instanceof AST_Object)) return;
var trimmed = false;
do {
if (!try_join(exprs[0])) break;
exprs.shift();
trimmed = true;
} while (exprs.length);
return trimmed;
if (value instanceof AST_Array) {
var trimmed = false;
do {
if (!try_join_array(exprs[0])) break;
exprs.shift();
trimmed = true;
} while (exprs.length);
return trimmed;
} else if (value instanceof AST_Object) {
var trimmed = false;
do {
if (!try_join_object(exprs[0])) break;
exprs.shift();
trimmed = true;
} while (exprs.length);
return trimmed;
}
function try_join(node) {
function try_join_array(node) {
if (!(node instanceof AST_Assign)) return;
if (node.operator != "=") return;
if (!(node.left instanceof AST_PropAccess)) return;
@@ -4241,7 +4250,30 @@ Compressor.prototype.compress = function(node) {
if (!node.right.is_constant_expression(scope)) return;
var prop = node.left.property;
if (prop instanceof AST_Node) {
if (try_join(prop)) prop = node.left.property = prop.right.clone();
if (try_join_array(prop)) prop = node.left.property = prop.right.clone();
prop = prop.evaluate(compressor);
}
if (prop instanceof AST_Node) return;
if (!RE_POSITIVE_INTEGER.test("" + prop)) return;
prop = +prop;
var len = value.elements.length;
if (prop > len + 4) return;
while (len < prop) value.elements[len++] = make_node(AST_Hole, value);
value.elements[prop] = node.right;
return true;
}
function try_join_object(node) {
if (!(node instanceof AST_Assign)) return;
if (node.operator != "=") return;
if (!(node.left instanceof AST_PropAccess)) return;
var sym = node.left.expression;
if (!(sym instanceof AST_SymbolRef)) return;
if (!names.has(sym.name)) return;
if (!node.right.is_constant_expression(scope)) return;
var prop = node.left.property;
if (prop instanceof AST_Node) {
if (try_join_object(prop)) prop = node.left.property = prop.right.clone();
prop = prop.evaluate(compressor);
}
if (prop instanceof AST_Node) return;