81 lines
2.3 KiB
Swift
81 lines
2.3 KiB
Swift
class IfNode : NodeType {
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let variable:Variable
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let trueNodes:[NodeType]
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let falseNodes:[NodeType]
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class func parse(_ parser:TokenParser, token:Token) throws -> NodeType {
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let components = token.components()
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guard components.count == 2 else {
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throw TemplateSyntaxError("'if' statements should use the following 'if condition' `\(token.contents)`.")
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}
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let variable = components[1]
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var trueNodes = [NodeType]()
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var falseNodes = [NodeType]()
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trueNodes = try parser.parse(until(["endif", "else"]))
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guard let token = parser.nextToken() else {
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throw TemplateSyntaxError("`endif` was not found.")
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}
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if token.contents == "else" {
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falseNodes = try parser.parse(until(["endif"]))
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_ = parser.nextToken()
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}
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return IfNode(variable: variable, trueNodes: trueNodes, falseNodes: falseNodes)
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}
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class func parse_ifnot(_ parser:TokenParser, token:Token) throws -> NodeType {
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let components = token.components()
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guard components.count == 2 else {
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throw TemplateSyntaxError("'ifnot' statements should use the following 'ifnot condition' `\(token.contents)`.")
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}
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let variable = components[1]
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var trueNodes = [NodeType]()
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var falseNodes = [NodeType]()
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falseNodes = try parser.parse(until(["endif", "else"]))
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guard let token = parser.nextToken() else {
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throw TemplateSyntaxError("`endif` was not found.")
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}
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if token.contents == "else" {
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trueNodes = try parser.parse(until(["endif"]))
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_ = parser.nextToken()
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}
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return IfNode(variable: variable, trueNodes: trueNodes, falseNodes: falseNodes)
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}
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init(variable:String, trueNodes:[NodeType], falseNodes:[NodeType]) {
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self.variable = Variable(variable)
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self.trueNodes = trueNodes
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self.falseNodes = falseNodes
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}
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func render(_ context: Context) throws -> String {
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let result = try variable.resolve(context)
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var truthy = false
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if let result = result as? [Any] {
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truthy = !result.isEmpty
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} else if let result = result as? [String:Any] {
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truthy = !result.isEmpty
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} else if let result = result as? Bool {
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truthy = result
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} else if result != nil {
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truthy = true
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}
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return try context.push {
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if truthy {
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return try renderNodes(trueNodes, context)
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} else {
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return try renderNodes(falseNodes, context)
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}
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}
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}
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}
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