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enhance booleans (#5043)

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This commit is contained in:
Alex Lam S.L
2021-06-30 20:05:52 +01:00
committed by GitHub
parent 611abff49f
commit 1b745494ce
2 changed files with 71 additions and 9 deletions
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36
lib/compress.js
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@@ -8239,7 +8239,10 @@ merge(Compressor.prototype, {
}
function mark_duplicate_condition(compressor, node) {
var level = 0, child, parent = compressor.self();
var child;
var level = 0;
var negated = false;
var parent = compressor.self();
if (!is_statement(parent)) while (true) {
child = parent;
parent = compressor.parent(level++);
@@ -8248,16 +8251,24 @@ merge(Compressor.prototype, {
if (!lazy_op[op]) return;
var left = parent.left;
if (left === child) continue;
if (node.equivalent_to(left)) node[op == "&&" ? "truthy" : "falsy"] = true;
if (match(left)) switch (op) {
case "&&":
node[negated ? "falsy" : "truthy"] = true;
break;
case "||":
case "??":
node[negated ? "truthy" : "falsy"] = true;
break;
}
} else if (parent instanceof AST_Conditional) {
var cond = parent.condition;
if (cond === child) continue;
if (node.equivalent_to(cond)) switch (child) {
if (match(cond)) switch (child) {
case parent.consequent:
node.truthy = true;
node[negated ? "falsy" : "truthy"] = true;
break;
case parent.alternative:
node.falsy = true;
node[negated ? "truthy" : "falsy"] = true;
break;
}
} else if (parent instanceof AST_Exit) {
@@ -8277,17 +8288,26 @@ merge(Compressor.prototype, {
if (parent instanceof AST_BlockStatement) {
if (parent.body[0] === child) continue;
} else if (parent instanceof AST_If) {
if (node.equivalent_to(parent.condition)) switch (child) {
if (match(parent.condition)) switch (child) {
case parent.body:
node.truthy = true;
node[negated ? "falsy" : "truthy"] = true;
break;
case parent.alternative:
node.falsy = true;
node[negated ? "truthy" : "falsy"] = true;
break;
}
}
return;
}
function match(cond) {
if (node.equivalent_to(cond)) return true;
if (!(cond instanceof AST_UnaryPrefix)) return false;
if (cond.operator != "!") return false;
if (!node.equivalent_to(cond.expression)) return false;
negated = true;
return true;
}
}
OPT(AST_If, function(self, compressor) {