a352f28785
All of our static evaluation & dead-code elimination transforms need to
happen in post-order, transforming inner nodes first. This is so that
in complex nested cases all transforms see the simplified version of
their inner nodes.
For example:
async getNimbusExperimentData() {
if (!PDFJSDev.test("GECKOVIEW")) { return null; }
// other code
}
-> [evaluation of PDFJSDev.*]
async getNimbusExperimentData() {
if (!false) { return null; }
// other code
}
-> [!false -> true]
async getNimbusExperimentData() {
if (true) { return null; }
// other code
}
-> [if (true) -> replace with the if branch]
async getNimbusExperimentData() {
return null;
// other code
}
-> [early return -> remove dead code]
async getNimbusExperimentData() {
return null;
// other code
}
This was done correctly in all cases except for our `UnaryExpression`
transform, which was happening in pre-order.
13 lines
525 B
JavaScript
13 lines
525 B
JavaScript
var a = typeof PDFJSDev === 'undefined';
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var b = typeof PDFJSDev !== 'undefined';
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var c = PDFJSDev.test('TRUE');
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var d = PDFJSDev.test('FALSE');
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var e = PDFJSDev.eval('TRUE');
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var f = PDFJSDev.eval('TEXT');
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var g = PDFJSDev.eval('OBJ');
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var h = PDFJSDev.json('$ROOT/external/builder/fixtures_esprima/evals.json');
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var i = typeof PDFJSDev === 'undefined' ? PDFJSDev.eval('FALSE') : '0';
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var j = typeof PDFJSDev !== 'undefined' ? PDFJSDev.eval('OBJ.obj') : '0';
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var k = !PDFJSDev.test('TRUE');
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var l = !PDFJSDev.test('FALSE');
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