Hannah Wolfe
c76ded8f0f
fixes #1548 - add a guard to show readable syntax error for if / unless helper - prevents against 3 different errors that can be generated by different systax errors
24 lines
1.1 KiB
JavaScript
24 lines
1.1 KiB
JavaScript
import { isEmpty, isFunction } from '../utils';
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import Exception from '../exception';
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export default function(instance) {
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instance.registerHelper('if', function(conditional, options) {
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if (arguments.length != 2) { throw new Exception('#if requires exactly one argument');}
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if (isFunction(conditional)) { conditional = conditional.call(this); }
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// Default behavior is to render the positive path if the value is truthy and not empty.
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// The `includeZero` option may be set to treat the condtional as purely not empty based on the
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// behavior of isEmpty. Effectively this determines if 0 is handled by the positive path or negative.
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if ((!options.hash.includeZero && !conditional) || isEmpty(conditional)) {
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return options.inverse(this);
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} else {
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return options.fn(this);
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}
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});
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instance.registerHelper('unless', function(conditional, options) {
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if (arguments.length != 2) { throw new Exception('#unless requires exactly one argument');}
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return instance.helpers['if'].call(this, conditional, {fn: options.inverse, inverse: options.fn, hash: options.hash});
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});
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}
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