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import { isEmpty, isFunction } from '../utils';
import Exception from '../exception';
export default function(instance) {
instance.registerHelper('if', function(conditional, options) {
if (arguments.length != 2) {
throw new Exception('#if requires exactly one argument');
}
if (isFunction(conditional)) {
conditional = conditional.call(this);
}
// Default behavior is to render the positive path if the value is truthy and not empty.
// The `includeZero` option may be set to treat the condtional as purely not empty based on the
// behavior of isEmpty. Effectively this determines if 0 is handled by the positive path or negative.
if ((!options.hash.includeZero && !conditional) || isEmpty(conditional)) {
return options.inverse(this);
} else {
return options.fn(this);
}
});
instance.registerHelper('unless', function(conditional, options) {
if (arguments.length != 2) {
throw new Exception('#unless requires exactly one argument');
}
return instance.helpers['if'].call(this, conditional, {
fn: options.inverse,
inverse: options.fn,
hash: options.hash
});
});
}