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Alow disabling debug info such as ng-scope, ng-binding classes #8802
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The compiler and ngBind directives add binding information (`ng-binding`
CSS class and `$binding` data property) to elements when they are bound to
the scope. This is only to aid testing and debugging for tools such as
Protractor and Batarang. In production this is unnecessary and add a
performance penalty.
This can be now disabled by calling `$compileProvider.debugInfoEnabled(false)`
in a module `config` block:
```
someModule.config(['$compileProvider', function($compileProvider) {
$compileProvider.debugInfoEnabled(false);
}]);
```
In the bench/apps/largetable-bp benchmark this change, with debug info disabled,
improved by ~140ms, that is 10%.
Measuring the "create" phase, 25 loops, mean time ~1340ms -> ~1200ms.
We were storing the whole `interpolationFn` in the `$binding` data on
elements but this function was bringing a lot of closure variables with it
and so was consuming unwanted amounts of memory.
Now we are only storing the parsed interpolation expressions from the
binding (i.e. the values of `interpolationFn.expressions`).
BREAKING CHANGE:
The value of `$binding` data property on an element is always an array now
and the expressions do not include the curly braces `{{ ... }}`.
The compiler adds scope information (`ng-scope` CSS class and `$scope` data property) to elements
when the are bound to the scope. This is mostly to aid debugging tools such as Batarang. In
production this should be unnecesary and adds a performance penalty.
In the bench/apps/largetable-bp this change caused an improvement of ~100ms (7%).
This can be now disabled by calling `$compileProvider.debugInfoEnabled(false)`
in a module `config` block:
```
someModule.config(['$compileProvider', function($compileProvider) {
$compileProvider.debugInfoEnabled(false);
}]);
```
In the bench/apps/largetable-bp benchmark this change, with debug info disabled,
improved by ~120ms, that is ~10%.
Measuring the "create" phase, 25 loops, mean time ~1200ms -> ~1080ms.
After upgrading, Protractor requires exact string that is used in the binding.
…array Instead of knowing about `.expressions` property, it just accepts a single expression or an array of expressions.
We run unit tests in “strict” mode and thus can’t monkey-patch `window.location` nor `window.location.reload`. In order to avoid full page reload, we could pass location as argument, or another level of indirection, something like this:
```js
var ourGlobalFunkyLocation = window.location;
function reloadWithDebugInfo() {
window.name = 'NG_ENABLE_DEBUG_INFO!' + window.name;
ourGlobalFunkyLocation.reload();
}
// in the test
ourGlobalFunkyLocation = {
reload: function() {}
};
reloadWithDebugInfo();
ourGlobalFunkyLocation = window.location;
```
I don’t think any of these make sense, just so that we can test setting `window.name`. If the `reloadWithDebugInfo` function was more complicated, I would do it.
I don’t think it’s worthy to confuse production code with extra logic which purpose was only to make testing possible.
`$$addScopeInfo` used to accept either DOM Node or jqLite/jQuery wrapper. This commit simplifies the method to always require jqLite/jQuery wrapper and thus remove the `element.data` condition which was wrong. If `element` was a raw comment element, the `data` property was a string (the value of the comment) and an exception was thrown.
To follow our convention (at least in this file): if it’s a jqLite/jQuery wrapper than the variable name starts with `$`.
In a93f03d and d37f103 we changed the compiler and ngBind to add debugging CSS classes (i.e. ng-scope, ng-binding) in linking function. This simplified the code and made sense under the original assumptions that the debug info will be disabled by default. That is however not the case - debug info is enabled by default. When debug info is enabled, this change improves the largetable-bp benchmark by ~580ms, that is 30% faster. Measuring the “create” phase, 25 loops, meantime ~1920ms -> ~1340ms. This change does not affect performance when debug info is disabled.
For easier debugging.
|
Merged as c6bde52 |
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This is based on Pete's PR.