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more sequencesizing (WIP)

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This commit is contained in:
Mihai Bazon
2012-09-16 16:29:17 +03:00
parent 21c34a1792
commit 0f418d654e
1 changed files with 47 additions and 0 deletions
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47
lib/compress.js
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@@ -189,6 +189,7 @@ function Compressor(options, false_by_default) {
} }
if (compressor.option("sequences")) { if (compressor.option("sequences")) {
statements = sequencesize(statements, compressor); statements = sequencesize(statements, compressor);
statements = sequencesize_2(statements, compressor);
} }
if (compressor.option("if_return")) { if (compressor.option("if_return")) {
statements = handle_if_return(statements, compressor); statements = handle_if_return(statements, compressor);
@@ -371,6 +372,52 @@ function Compressor(options, false_by_default) {
return ret; return ret;
}; };
function sequencesize_2(statements, compressor) {
var ret = [], prev = null;
statements.forEach(function(stat){
if (prev) {
if (stat instanceof AST_For && stat.init && !(stat.init instanceof AST_Definitions)) {
if (prev.body instanceof AST_Seq) {
prev.body.add(stat.init);
prev.body = prev.body.optimize(compressor);
stat.init = prev.body;
} else {
stat.init = AST_Seq.cons(prev.body, stat.init).optimize(compressor);
}
ret.pop();
}
else if (stat instanceof AST_For && !stat.init) {
stat.init = prev.body;
ret.pop();
}
else if (stat instanceof AST_If) {
if (prev.body instanceof AST_Seq) {
prev.body.add(stat.condition);
prev.body = prev.body.optimize(compressor);
stat.condition = prev.body;
} else {
stat.condition = AST_Seq.cons(prev.body, stat.condition).optimize(compressor);
}
ret.pop();
}
else if (stat instanceof AST_With) {
if (prev.body instanceof AST_Seq) {
prev.body.add(stat.expression);
prev.body = prev.body.optimize(compressor);
stat.expression = prev.body;
} else {
stat.expression = AST_Seq.cons(prev.body, stat.expression).optimize(compressor);
}
ret.pop();
}
}
ret.push(stat);
prev = stat instanceof AST_SimpleStatement ? stat : null;
});
CHANGED = ret.length != statements.length;
return ret;
};
function join_consecutive_vars(statements, compressor) { function join_consecutive_vars(statements, compressor) {
var prev = null; var prev = null;
return statements.reduce(function(a, stat){ return statements.reduce(function(a, stat){