Pachyderm: Add CharacterCounter

This commit is contained in:
Shadowfacts 2018-09-29 21:16:45 -04:00
parent 813ed27d29
commit d1b45ddf7b
Signed by: shadowfacts
GPG Key ID: 94A5AB95422746E5
3 changed files with 86 additions and 0 deletions

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@ -0,0 +1,35 @@
//
// CharacterCounter.swift
// Pachyderm
//
// Created by Shadowfacts on 9/29/18.
// Copyright © 2018 Shadowfacts. All rights reserved.
//
import Foundation
public struct CharacterCounter {
static let linkDetector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
static let mention = try! NSRegularExpression(pattern: "(@[a-z0-9_]+)(?:@[a-z0-9\\-\\.]+[a-z0-9]+)?", options: .caseInsensitive)
public static func count(text: String) -> Int {
let mentionsRemoved = removeMentions(in: text)
var count = mentionsRemoved.count
for match in linkDetector.matches(in: mentionsRemoved, options: [], range: NSRange(location: 0, length: mentionsRemoved.utf16.count)) {
count -= match.range.length
count += 23 // Mastodon link length
}
return count
}
private static func removeMentions(in text: String) -> String {
var mut = text
for match in mention.matches(in: mut, options: [], range: NSRange(location: 0, length: mut.utf16.count)).reversed() {
let replacement = mut[Range(match.range(at: 1), in: mut)!]
mut.replaceSubrange(Range(match.range, in: mut)!, with: replacement)
}
return mut
}
}

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@ -0,0 +1,43 @@
//
// CharacterCounterTests.swift
// PachydermTests
//
// Created by Shadowfacts on 9/29/18.
// Copyright © 2018 Shadowfacts. All rights reserved.
//
import XCTest
@testable import Pachyderm
class CharacterCounterTests: XCTestCase {
override func setUp() {
}
override func tearDown() {
}
func testCountPlainText() {
XCTAssertEqual(CharacterCounter.count(text: "This is an example message"), 26)
XCTAssertEqual(CharacterCounter.count(text: "This is an example message with an Emoji: 😄"), 43)
XCTAssertEqual(CharacterCounter.count(text: "😄😄😄😄😄😄😄"), 7)
}
func testCountLinks() {
XCTAssertEqual(CharacterCounter.count(text: "This is an example with a link: https://example.com"), 55)
XCTAssertEqual(CharacterCounter.count(text: "This is an example with a link 😄: https://example.com"), 57)
XCTAssertEqual(CharacterCounter.count(text: "😄😄😄😄😄😄😄: https://example.com"), 32)
XCTAssertEqual(CharacterCounter.count(text: "This is an example with a link: https://a.much.longer.example.com/link?foo=bar#baz"), 55)
}
func testCountLocalMentions() {
XCTAssertEqual(CharacterCounter.count(text: "hello @example"), 14)
XCTAssertEqual(CharacterCounter.count(text: "@some_really_long_name"), 22)
}
func testCountRemoteMentions() {
XCTAssertEqual(CharacterCounter.count(text: "hello @example@some.remote.social"), 14)
XCTAssertEqual(CharacterCounter.count(text: "hello @some_really_long_name@some-long.remote-instance.social"), 28)
}
}

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