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drop unused function

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This commit is contained in:
Mihai Bazon
2012-09-16 15:46:47 +03:00
parent 7b6a402916
commit 21c34a1792
1 changed files with 0 additions and 118 deletions
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118
lib/compress.js
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@@ -317,124 +317,6 @@ function Compressor(options, false_by_default) {
return ret;
};
/// XXX: this function is UGLY and kinda wrong.
/// I think it would be cleaner if it operates backwards.
function handle_if_return_2(statements, compressor) {
var self = compressor.self();
var in_lambda = self instanceof AST_Lambda;
var last = statements.length - 1;
return MAP(statements, function(stat, i){
if (stat instanceof AST_If
&& stat.body instanceof AST_Continue
&& !stat.alternative
&& self === stat.body.target()) {
CHANGED = true;
if (i < last) {
var rest = statements.slice(i + 1);
var cond = stat.condition;
while (rest[0] instanceof AST_If
&& rest[0].body instanceof AST_Continue
&& self === rest[0].body.target()
&& !rest[0].alternative) {
cond = make_node(AST_Binary, rest[0], {
operator: "||",
left: cond,
right: rest[0].condition
});
rest.shift();
}
return MAP.last(make_node(AST_If, stat, {
condition: cond.negate(compressor),
body: make_node(AST_BlockStatement, stat, {
body: rest
}).optimize(compressor)
}).optimize(compressor))
} else {
return make_node(AST_SimpleStatement, stat, {
body: stat.condition
}).optimize(compressor);
}
}
if (stat instanceof AST_If
&& stat.body instanceof AST_Return
&& !stat.alternative
&& in_lambda) {
if (!stat.body.value) {
CHANGED = true;
if (i < last) {
var rest = statements.slice(i + 1);
var cond = stat.condition;
while (rest[0] instanceof AST_If
&& rest[0].body instanceof AST_Return
&& !rest[0].body.value
&& !rest[0].alternative) {
cond = make_node(AST_Binary, rest[0], {
operator: "||",
left: cond,
right: rest[0].condition
});
rest.shift();
}
return MAP.last(make_node(AST_If, stat, {
condition: cond.negate(compressor),
body: make_node(AST_BlockStatement, stat, {
body: rest
}).optimize(compressor)
}).optimize(compressor));
} else {
return make_node(AST_SimpleStatement, stat, {
body: stat.condition
}).optimize(compressor);
}
} else if (i == last && last > 0
&& statements[last - 1] instanceof AST_If
&& statements[last - 1].body instanceof AST_Return
&& !statements[last - 1].alternative) {
CHANGED = true;
return MAP.splice([ stat, make_node(AST_Return, stat, {
value: make_node(AST_Undefined, stat).optimize(compressor)
}).optimize(compressor)]);
}
}
if (stat instanceof AST_If
&& stat.body instanceof AST_Exit
&& stat.body.value
&& !stat.alternative
&& i < last
&& statements[i + 1].TYPE == stat.body.TYPE
&& statements[i + 1].value) {
CHANGED = true;
return MAP.last(make_node(AST_If, stat, {
condition: stat.condition,
body: stat.body,
alternative: statements[i + 1]
}).optimize(compressor));
}
if (stat instanceof AST_If
&& stat.alternative instanceof AST_Exit) {
CHANGED = true;
return MAP.last(MAP.splice([
// 1. negate IF and put the exit in the consequent
make_node(AST_If, stat, {
condition: stat.condition.negate(compressor),
body: stat.alternative
}),
// 2. the IF body can now go outside the if
stat.body
// and 3. add the rest of the statements
].concat(statements.slice(i + 1))));
return MAP.last(make_node(AST_If, stat, {
condition: stat.condition.negate(compressor),
body: stat.alternative,
alternative: make_node(AST_BlockStatement, stat.body, {
body: [ stat.body ].concat(statements.slice(i + 1))
})
}).optimize(compressor));
}
return stat;
});
};
function eliminate_dead_code(statements, compressor) {
var has_quit = false;
return statements.reduce(function(a, stat){