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Un exemple de DSL très simple avec Scala
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| case class Banque(nom:String) {banque => | |
| def accepte(m:Montant) = | |
| CompteBuilder(banque, m) | |
| } | |
| implicit def stringToBanque(s:String) = Banque(s) | |
| implicit def intWithDevise(i:Int) = new { | |
| def ~(d:Devise) = Montant(i, d) | |
| } | |
| case class CompteBuilder(b:Banque, m:Montant) { | |
| def sur(compte:String) = Compte(b, compte).plus(m) | |
| } | |
| trait Devise | |
| case object Euro extends Devise | |
| case object Pound extends Devise | |
| case class Compte(banque:Banque, numero:String, situation:Situation=ZERO) { | |
| def plus(montant:Montant) = this.copy(situation = situation + montant) | |
| def moins(montant:Montant) = plus(-montant) | |
| } | |
| case class Montant(somme:Int, d:Devise) { | |
| def +(other:Montant) = this.copy(somme=other.somme+somme) //ignoring the devise in this example | |
| def unary_- = this.copy(somme = -somme) | |
| } | |
| case class Situation(montant:Montant) { | |
| def +(m:Montant) = this.copy(montant=montant + m) | |
| } | |
| case object ZERO extends Situation(Montant(0, Euro)) |
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| "XXX" accepte 1000~Euro sur "001-345657678-23" plus 200~Euro moins 50~Euro |
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Plusieurs erreurs sont levées lors de la compilation au niveau des "implicit def ..." (lignes 8, 10).
Comment peut-on y remédier ?