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enhance conditionals (#5575)

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This commit is contained in:
Alex Lam S.L
2022-07-25 18:49:45 +01:00
committed by GitHub
parent fc7678c115
commit 996836b67e
2 changed files with 115 additions and 4 deletions
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29
lib/compress.js
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@@ -9662,10 +9662,20 @@ Compressor.prototype.compress = function(node) {
var alt_index = last_index(alt_stats);
for (var stats = []; body_index >= 0 && alt_index >= 0;) {
var stat = body_stats[body_index];
if (!stat.equals(alt_stats[alt_index])) break;
body_stats.splice(body_index--, 1);
alt_stats.splice(alt_index--, 1);
stats.unshift(stat);
var alt_stat = alt_stats[alt_index];
if (stat.equals(alt_stat)) {
body_stats.splice(body_index--, 1);
alt_stats.splice(alt_index--, 1);
stats.unshift(stat);
} else {
if (!(stat instanceof AST_SimpleStatement)) break;
if (!(alt_stat instanceof AST_SimpleStatement)) break;
var expr = stat.body.tail_node();
if (!expr.equals(alt_stat.body.tail_node())) break;
body_index = pop_expr(body_stats, stat.body, body_index);
alt_index = pop_expr(alt_stats, alt_stat.body, alt_index);
stats.unshift(make_node(AST_SimpleStatement, expr, { body: expr }));
}
}
if (stats.length > 0) {
self.body = body_stats.length > 0 ? make_node(AST_BlockStatement, self, {
@@ -9692,6 +9702,17 @@ Compressor.prototype.compress = function(node) {
return index;
}
function pop_expr(stats, body, index) {
if (body instanceof AST_Sequence) {
stats[index] = make_node(AST_SimpleStatement, body, {
body: make_sequence(body, body.expressions.slice(0, -1)),
});
} else {
stats.splice(index--, 1);
}
return index;
}
function sequencesize(stat, defuns, var_defs, refs) {
if (stat == null) return [];
if (stat instanceof AST_BlockStatement) {