hollance

Barfdown: a Markdown-ish Parser Written in Swift

Goals for this project:

• Parse a simplified version of Markdown that is good enough for writing my blog posts.
• Be reasonably efficient. This means the parser shouldn't copy substrings around if not necessary. This is done by storing all the elements as indexes into the original text.
• Be small and therefore be easy to understand.
• No regular expressions. They are the lazy person's solution to parsing. ;-)

This is just a toy project for me to experiment with writing parsers in Swift. Because why not?

hollance

/*
  Boyer-Moore string search
  
  This code is based on the article "Faster String Searches" by Costas Menico
  from Dr Dobb's magazine, July 1989. (Yes, 1989!)
  http://www.drdobbs.com/database/faster-string-searches/184408171
 */

extension String {
  func indexOf(pattern: String) -> String.Index? {

hollance

var rect = CGRect(x: 100, y: 10, width: 205, height: 10000)
addressLabel.frame = rect
addressLabel.sizeToFit()

rect.size.height = addressLabel.frame.size.height
addressLabel.frame = rect

hollance

struct TakeWhile<S: SequenceType>: SequenceType {
  private let seq: S
  private let block: (S.Generator.Element) -> Bool
  init(_ seq: S, block: (S.Generator.Element) -> Bool) {
    self.seq = seq
    self.block = block
  }
  func generate() -> GeneratorOf<S.Generator.Element> {
    var gen = seq.generate()
    return GeneratorOf<S.Generator.Element> {

hollance

/*
 The code from https://gist.github.com/GarthSnyder/c8efe80675cd00322b51
 rewritten as a Swift sequence and generator.
 */

import Foundation
 
struct PrimeFactorGenerator: GeneratorType {
  var n: Int
  var divisor = 2

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import Foundation
import CoreGraphics

@infix func * (left: CGPoint, right: (a: CGFloat, b: CGFloat)) -> CGPoint {
  return CGPoint(x: left.x * right.a, y: left.y * right.b)
}

let pt1 = CGPointMake(100, 50)
let pt2 = pt1 * (2, 3)

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class Set<T: Hashable>: Sequence, Printable {
  var dictionary = Dictionary<T, Bool>()  // private

  func addElement(newElement: T) {
    dictionary[newElement] = true
  }

  func removeElement(element: T) {
    dictionary[element] = nil
  }

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extension String {
  subscript(i: Int) -> Character {
    return Array(self)[i]
  }
}

var s = "Hello world"
println(s[0])

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#import <SpriteKit/SpriteKit.h>

@interface MotionStreak : SKShapeNode

- (void)addPosition:(CGPoint)position;
- (void)updateStreak;

@end

hollance

// Gets the path to the app's Documents folder
- (NSString *)documentsDirectory
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    return paths[0];
}

// Gets the path to the data file
- (NSString *)dataFilePath
{