GRMustache.swift cycle

gistfile1.swift

import Mustache

// Wrap the result in a section, and the key `cycleKey` will enumerate and cycle
// around boxes, one after the other.
func cyclingBox(key cycleKey: String, #boxes: [MustacheBox]) -> MustacheBox {
    var index = 0
    return Box { (key: String) in
        if key == cycleKey {
            let box = boxes[index]
            index = (index + 1) % boxes.count
            return box
        } else {
            return Box()
        }
    }
}

let templateString =
    "First cycle:\n" +
    "{{#cycle}}" +
        "{{x}}{{x}}{{x}}{{x}}{{x}}" +
    "{{/cycle}}" +
    
    "\nNext cycle:\n" +
    "{{#cycle}}" +
        "{{x}}{{x}}{{x}}{{x}}{{x}}" +
    "{{/cycle}}" +
    
    "\nCycle wrapped in another cycle:\n" +
    "{{#cycle}}" +
        "{{x}}{{x}}" +
        "(" +
        "{{#cycle}}" +
            "{{x}}{{x}}{{x}}{{x}}" +
        "{{/cycle}}" +
        ")" +
        "{{x}}{{x}}" +
    "{{/cycle}}"
let template = Template(string: templateString)!

// Rendering:
//
// First cycle:
// ABCAB
// Next cycle:
// ABCAB
// Cycle wrapped in another cycle:
// AB(ABCA)CA
let cycle = cyclingBox(key: "x", boxes: [Box("A"), Box("B"), Box("C")])
let rendering = template.render(Box(["cycle": cycle]))!
print(rendering)