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clean up negate_iife

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- remove extra tree scanning phase for `negate_iife`
- `negate_iife` now only deals with the narrowest form, i.e. IIFE sitting directly under `AST_SimpleStatement`
- `booleans`, `conditionals` etc. will now take care the rest via more accurate accounting
- `a(); void b();` => `a(); b();`

fixes #1288
closes #1451
This commit is contained in:
alexlamsl
2017-02-18 19:11:57 +08:00
parent 6b3c49e458
commit f0ff6189be
5 changed files with 277 additions and 99 deletions
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25
lib/output.js
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@@ -425,7 +425,6 @@ function OutputStream(options) {
pos : function() { return current_pos },
push_node : function(node) { stack.push(node) },
pop_node : function() { return stack.pop() },
stack : function() { return stack },
parent : function(n) {
return stack[stack.length - 2 - (n || 0)];
}
@@ -1334,30 +1333,6 @@ function OutputStream(options) {
}
};
// return true if the node at the top of the stack (that means the
// innermost node in the current output) is lexically the first in
// a statement.
function first_in_statement(output) {
var a = output.stack(), i = a.length, node = a[--i], p = a[--i];
while (i > 0) {
if (p instanceof AST_Statement && p.body === node)
return true;
if ((p instanceof AST_Seq && p.car === node ) ||
(p instanceof AST_Call && p.expression === node && !(p instanceof AST_New) ) ||
(p instanceof AST_Dot && p.expression === node ) ||
(p instanceof AST_Sub && p.expression === node ) ||
(p instanceof AST_Conditional && p.condition === node ) ||
(p instanceof AST_Binary && p.left === node ) ||
(p instanceof AST_UnaryPostfix && p.expression === node ))
{
node = p;
p = a[--i];
} else {
return false;
}
}
};
// self should be AST_New. decide if we want to show parens or not.
function need_constructor_parens(self, output) {
// Always print parentheses with arguments