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in-place join_vars

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This commit is contained in:
alexlamsl 2017-06-16 15:01:00 +08:00
parent f044a8efa4
commit eca96f1905
1 changed files with 8 additions and 10 deletions
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18
lib/compress.js
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@ -679,7 +679,7 @@ merge(Compressor.prototype, {
statements = sequencesize(statements, compressor);
}
if (compressor.option("join_vars")) {
statements = join_consecutive_vars(statements, compressor);
join_consecutive_vars(statements, compressor);
}
if (compressor.option("collapse_vars")) {
collapse(statements, compressor);
@ -1173,8 +1173,9 @@ merge(Compressor.prototype, {
};
function join_consecutive_vars(statements, compressor) {
var prev = null;
return statements.reduce(function(a, stat){
for (var i = 0, j = -1, len = statements.length; i < len; i++) {
var stat = statements[i];
var prev = statements[j];
if (stat instanceof AST_Definitions && prev && prev.TYPE == stat.TYPE) {
prev.definitions = prev.definitions.concat(stat.definitions);
CHANGED = true;
@ -1183,21 +1184,18 @@ merge(Compressor.prototype, {
&& prev instanceof AST_Var
&& (!stat.init || stat.init.TYPE == prev.TYPE)) {
CHANGED = true;
a.pop();
if (stat.init) {
stat.init.definitions = prev.definitions.concat(stat.init.definitions);
} else {
stat.init = prev;
}
a.push(stat);
prev = stat;
statements[j] = stat;
}
else {
prev = stat;
a.push(stat);
statements[++j] = stat;
}
return a;
}, []);
}
statements.length = j + 1;
};
};