46 lines
1.1 KiB
Swift
46 lines
1.1 KiB
Swift
/// A container for template variables.
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public class Context {
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var dictionaries:[[String: Any]]
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/// Initialise a Context with a dictionary
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public init(dictionary:[String: Any]) {
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dictionaries = [dictionary]
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}
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/// Initialise an empty Context
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public init() {
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dictionaries = []
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}
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public subscript(key: String) -> Any? {
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/// Retrieves a variable's value, starting at the current context and going upwards
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get {
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for dictionary in Array(dictionaries.reverse()) {
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if let value = dictionary[key] {
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return value
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}
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}
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return nil
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}
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/// Set a variable in the current context, deleting the variable if it's nil
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set(value) {
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if var dictionary = dictionaries.popLast() {
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dictionary[key] = value
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dictionaries.append(dictionary)
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}
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}
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}
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/// Push a new level into the Context
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public func push(dictionary: [String: Any]? = nil) {
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dictionaries.append(dictionary ?? [:])
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}
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/// Pop the last level off of the Context
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public func pop() -> [String: Any]? {
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return dictionaries.popLast()
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}
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}
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