112 lines
2.8 KiB
Swift
112 lines
2.8 KiB
Swift
import Foundation
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public func until(tags:[String])(parser:TokenParser, token:Token) -> Bool {
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if let name = token.components().first {
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for tag in tags {
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if name == tag {
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return true
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}
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}
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}
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return false
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}
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/// A class for parsing an array of tokens and converts them into a collection of Node's
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public class TokenParser {
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public typealias TagParser = (TokenParser, Token) -> Result
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public typealias NodeList = [Node]
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public enum Result {
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case Success(node: Node)
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case Error(error: Stencil.Error)
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}
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public enum Results {
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case Success(nodes: NodeList)
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case Error(error: Stencil.Error)
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}
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private var tokens:[Token]
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private var tags = [String:TagParser]()
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public init(tokens:[Token]) {
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self.tokens = tokens
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registerTag("for", parser: ForNode.parse)
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registerTag("if", parser: IfNode.parse)
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registerTag("ifnot", parser: IfNode.parse_ifnot)
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registerTag("now", parser: NowNode.parse)
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registerTag("include", parser: IncludeNode.parse)
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registerTag("extends", parser: ExtendsNode.parse)
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registerTag("block", parser: BlockNode.parse)
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}
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/// Registers a new template tag
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public func registerTag(name:String, parser:TagParser) {
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tags[name] = parser
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}
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/// Registers a simple template tag with a name and a handler
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public func registerSimpleTag(name:String, handler:((Context) -> (Stencil.Result))) {
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registerTag(name, parser: { (parser, token) -> TokenParser.Result in
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return .Success(node:SimpleNode(handler: handler))
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})
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}
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/// Parse the given tokens into nodes
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public func parse() -> Results {
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return parse(nil)
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}
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public func parse(parse_until:((parser:TokenParser, token:Token) -> (Bool))?) -> TokenParser.Results {
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var nodes = NodeList()
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while tokens.count > 0 {
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let token = nextToken()!
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switch token {
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case .Text(let text):
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nodes.append(TextNode(text: text))
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case .Variable(let variable):
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nodes.append(VariableNode(variable: variable))
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case .Block:
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let tag = token.components().first
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if let parse_until = parse_until {
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if parse_until(parser: self, token: token) {
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prependToken(token)
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return .Success(nodes:nodes)
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}
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}
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if let tag = tag {
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if let parser = self.tags[tag] {
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switch parser(self, token) {
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case .Success(let node):
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nodes.append(node)
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case .Error(let error):
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return .Error(error:error)
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}
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}
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}
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case .Comment:
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continue
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}
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}
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return .Success(nodes:nodes)
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}
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public func nextToken() -> Token? {
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if tokens.count > 0 {
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return tokens.removeAtIndex(0)
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}
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return nil
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}
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public func prependToken(token:Token) {
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tokens.insert(token, atIndex: 0)
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}
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}
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