30 lines
708 B
JavaScript
30 lines
708 B
JavaScript
class Helper {
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constructor(name, fn, useValueFallback = true) {
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this.name = name
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this.fn = fn
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this.useValueFallback = useValueFallback
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}
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register(handlebars) {
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// wrap the function so that no helper can cause handlebars to break
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handlebars.registerHelper(this.name, (value, info) => {
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let context = {}
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if (info && info.data && info.data.root) {
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context = info.data.root
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}
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const result = this.fn(value, context)
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if (result == null) {
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return this.useValueFallback ? value : null
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} else {
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return result
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}
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})
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}
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unregister(handlebars) {
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handlebars.unregisterHelper(this.name)
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}
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}
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module.exports = Helper
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