#96 setup language db connection and add query function

Keyboards/KeyboardsBase/InterfaceVariables.swift

@@ -30,7 +30,7 @@ var firstKeyboardLoad = false
 var spaceBar = String()
 var language = String()
 var languageTextForSpaceBar: String {
-    "\(language) (Scribe)"
+  "\(language) (Scribe)"
 }
 var showKeyboardLanguage = false
 

Keyboards/KeyboardsBase/KeyboardViewController.swift

@@ -5,6 +5,7 @@
 //
 
 import UIKit
+import GRDB
 
 /// The parent KeyboardViewController class that is inherited by all Scribe keyboards.
 class KeyboardViewController: UIInputViewController {
@@ -1410,6 +1411,9 @@ class KeyboardViewController: UIInputViewController {
       // Show the name of the keyboard to the user.
       showKeyboardLanguage = true
 
+      // Initialize the language database.
+      languageDB = openDBQueue()
+
       // Access UILexicon words including unpaired first and last names from Contacts.
       var uiLexiconWords = [String]()
       self.requestSupplementaryLexicon { (userLexicon: UILexicon!) -> Void in

Keyboards/KeyboardsBase/ScribeFunctionality/CommandVariables.swift

@@ -5,6 +5,7 @@
 //
 
 import UIKit
+import GRDB
 
 // Basic keyboard functionality variables.
 var capsLockPossible = false
@@ -30,6 +31,38 @@ var previousWord = ""
 var backspaceTimer: Timer?
 var scribeKeyHeight = CGFloat(0)
 
+/// Makes a connection to the language database given the value for controllerLanguage.
+func openDBQueue() -> DatabaseQueue {
+  let dbName = "\(String(describing: get_iso_code(keyboardLanguage: controllerLanguage).uppercased()))LanguageData"
+  let dbPath = Bundle.main.path(forResource: dbName, ofType: "sqlite")!
+  let db = try! DatabaseQueue(
+    path: dbPath
+  )
+
+  return db
+}
+
+/// Returns a value from the language database given a query and arguemtns.
+///
+/// - Parameters
+///   - query: the query to run against the language database.
+///   - args: arguments to pass to the query.
+///   - outputCol: the column from which the value should come.
+func queryDB(query: String, args: [String], outputCol: String) -> String {
+  var value = ""
+  do {
+    try languageDB.read { db in
+      if let row = try Row.fetchOne(db, sql: query, arguments: StatementArguments(args)) {
+        value = row[outputCol]
+      }
+    }
+  } catch {}
+
+  return value
+}
+
+var languageDB = try! DatabaseQueue()
+
 // All data needed for Scribe commands for the given language keyboard.
 var nouns = loadJSON(filename: "nouns")
 let verbs = loadJSON(filename: "verbs")

Keyboards/KeyboardsBase/Utilities.swift

@@ -1,8 +1,34 @@
 //
-//  File.swift
-//  Scribe
+//  Utilities.swift
 //
-//  Created by Andrew Tavis on 13.04.23.
+//  Simple utility functions for data extractiona and language management.
 //
 
-import Foundation
+
+/// Returns the ISO code given a langauge.
+///
+/// - Parameters
+///   - language: the language an ISO code should be returned for.
+func get_iso_code(keyboardLanguage: String) -> String {
+  var iso = ""
+  switch keyboardLanguage {
+  case "French":
+    iso = "fr"
+  case "German":
+    iso = "de"
+  case "Italian":
+    iso = "it"
+  case "Portuguese":
+    iso = "pt"
+  case "Russian":
+    iso = "ru"
+  case "Spanish":
+    iso = "es"
+  case "Swedish":
+    iso = "sv"
+  default:
+    break
+  }
+
+  return iso
+}