52 lines
1.7 KiB
Swift
52 lines
1.7 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Hummingbird server framework project
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//
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// Copyright (c) 2021-2021 the Hummingbird authors
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// Licensed under Apache License v2.0
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//
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// See LICENSE.txt for license information
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// See hummingbird/CONTRIBUTORS.txt for the list of Hummingbird authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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//===----------------------------------------------------------------------===//
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/// Lambda function. Can add this to object being rendered to filter contents of objects.
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///
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/// See http://mustache.github.io/mustache.5.html for more details on
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/// mustache lambdas. Lambdas work slightly differently in HummingbirdMustache though
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/// as they are passed a template representing the contained text and not the raw text
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/// e.g
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/// ```
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/// struct Object {
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/// let name: String
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/// let wrapped: HBMustacheLambda
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/// }
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/// let willy = Object(name: "Willy", wrapped: .init({ object, template in
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/// return "<b>\(template.render(object))</b>"
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/// }))
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/// let mustache = "{{#wrapped}}{{name}} is awesome.{{/wrapped}}"
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/// let template = try HBMustacheTemplate(string: mustache)
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/// let output = template.render(willy)
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/// print(output) // <b>Willy is awesome</b>
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/// ```
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///
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public struct HBMustacheLambda {
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/// lambda callback
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public typealias Callback = (Any, HBMustacheTemplate) -> String
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let callback: Callback
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/// Initialize `HBMustacheLambda`
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/// - Parameter cb: function to be called by lambda
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public init(_ cb: @escaping Callback) {
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self.callback = cb
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}
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internal func run(_ object: Any, _ template: HBMustacheTemplate) -> String {
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return self.callback(object, template)
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}
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}
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