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in-place tighten_body()

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This commit is contained in:
alexlamsl 2017-06-16 17:35:01 +08:00
parent 0ff3c24ad5
commit c9d37e81d0
1 changed files with 5 additions and 9 deletions
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14
lib/compress.js
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@ -686,8 +686,6 @@ merge(Compressor.prototype, {
} }
} while (CHANGED && max_iter-- > 0); } while (CHANGED && max_iter-- > 0);
return statements;
// Search from right to left for assignment-like expressions: // Search from right to left for assignment-like expressions:
// - `var a = x;` // - `var a = x;`
// - `a = x;` // - `a = x;`
@ -984,8 +982,7 @@ merge(Compressor.prototype, {
CHANGED = true; CHANGED = true;
stat = stat.clone(); stat = stat.clone();
stat.alternative = next; stat.alternative = next;
statements[i] = stat.transform(compressor); statements.splice(i, 2, stat.transform(compressor));
statements.length = i + 1;
continue; continue;
} }
//--- //---
@ -997,8 +994,7 @@ merge(Compressor.prototype, {
stat.alternative = next || make_node(AST_Return, stat, { stat.alternative = next || make_node(AST_Return, stat, {
value: null value: null
}); });
statements[i] = stat.transform(compressor); statements.splice(i, next ? 2 : 1, stat.transform(compressor));
statements.length = i + 1;
continue; continue;
} }
//--- //---
@ -1982,12 +1978,12 @@ merge(Compressor.prototype, {
}); });
OPT(AST_Block, function(self, compressor){ OPT(AST_Block, function(self, compressor){
self.body = tighten_body(self.body, compressor); tighten_body(self.body, compressor);
return self; return self;
}); });
OPT(AST_BlockStatement, function(self, compressor){ OPT(AST_BlockStatement, function(self, compressor){
self.body = tighten_body(self.body, compressor); tighten_body(self.body, compressor);
switch (self.body.length) { switch (self.body.length) {
case 1: return self.body[0]; case 1: return self.body[0];
case 0: return make_node(AST_EmptyStatement, self); case 0: return make_node(AST_EmptyStatement, self);
@ -2894,7 +2890,7 @@ merge(Compressor.prototype, {
}); });
OPT(AST_Try, function(self, compressor){ OPT(AST_Try, function(self, compressor){
self.body = tighten_body(self.body, compressor); tighten_body(self.body, compressor);
if (self.bcatch && self.bfinally && all(self.bfinally.body, is_empty)) self.bfinally = null; if (self.bcatch && self.bfinally && all(self.bfinally.body, is_empty)) self.bfinally = null;
if (all(self.body, is_empty)) { if (all(self.body, is_empty)) {
var body = []; var body = [];