93 lines
2.4 KiB
Swift
93 lines
2.4 KiB
Swift
//
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// Parser.swift
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// Stencil
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//
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// Created by Kyle Fuller on 23/10/2014.
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// Copyright (c) 2014 Cocode. All rights reserved.
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//
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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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public class TokenParser {
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private var tokens:[Token]
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private var tags = Dictionary<String, ((TokenParser, Token) -> ((node:Node?, error:Error?)))>()
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public init(tokens:[Token]) {
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self.tokens = tokens
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tags["for"] = ForNode.parse
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tags["now"] = NowNode.parse
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tags["if"] = IfNode.parse
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tags["ifnot"] = IfNode.parse_ifnot
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}
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public func parse() -> (nodes:[Node]?, error:Error?) {
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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))?) -> (nodes:[Node]?, error:Error?) {
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var nodes = [Node]()
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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(let value):
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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 (nodes, nil)
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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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let (node, error) = parser(self, token)
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if let error = error {
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return (nil, error)
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}
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if let node = node {
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nodes.append(node)
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}
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}
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}
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case .Comment(let value):
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continue
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}
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}
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return (nodes, nil)
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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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