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fix compressing a,b; return c; into return a,b,c;

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This commit is contained in:
Mihai Bazon
2012-08-27 11:00:22 +03:00
parent a8e49f1536
commit 4437e7af19
1 changed files with 10 additions and 7 deletions
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17
lib/compress.js
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@@ -158,8 +158,7 @@ function Compressor(options, false_by_default) {
}
else if (compressor.option("warnings")) {
stat.walk(new TreeWalker(function(node){
if (node instanceof AST_Definitions
|| node instanceof AST_Defun) {
if (node instanceof AST_Definitions || node instanceof AST_Defun) {
compressor.warn("Declarations in unreachable code! [{line},{col}]", node.start);
if (node instanceof AST_Definitions) {
node = node.clone();
@@ -169,11 +168,13 @@ function Compressor(options, false_by_default) {
else if (node instanceof AST_Defun) {
a.push(node);
}
return true; // no point to descend
}
if (node instanceof AST_Scope) {
// also don't descend any other nested scopes
return true;
}
if (node instanceof AST_Scope)
return true;
}))
}));
};
} else {
a.push(stat);
@@ -185,6 +186,7 @@ function Compressor(options, false_by_default) {
}, []);
}
// XXX: this is destructive -- it modifies tree nodes.
function sequencesize(statements) {
var prev = null, last = statements.length - 1;
if (last) statements = statements.reduce(function(a, cur, i){
@@ -196,8 +198,9 @@ function Compressor(options, false_by_default) {
});
prev.body = seq;
}
else if (i == last && cur instanceof AST_Exit
&& cur.value && a.length == 1) {
else if (i == last
&& cur instanceof AST_Exit && cur.value
&& a.length == 1 && prev instanceof AST_SimpleStatement) {
// it only makes sense to do this transformation
// if the AST gets to a single statement.
var seq = make_node(AST_Seq, prev, {