Scala DSLの作り方

Scala DSL

2010 5 18
( Lab)

2010 5 18

Scala

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•

•

•

• JVM Java

• Scalable ≒ DSL

2010 5 18

DSL

• Domain Speciﬁc Language

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•

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• OSMU (One Source Multi Use)

2010 5 18

Specs

object CsvEntityTest extends Speciﬁcation { • BDD
val TestReadDir = "/tmp/goldenport.d/read"
val TestCreateDir = "/tmp/goldenport.d/create/CsvEntity" • Behavior Driven
val readonlyCsvFileName = GoldenportTestUtility.readonlyCsvFileName Development
"CsvEntity Read" should {
"CsvEntity DefaultEntitySpace FileDataSource open" in { •
val space = new DefaultEntitySpace
space.addEntityClass(new CsvEntityClass())
val datasource = new FileDataSource(readonlyCsvFileName, space.context)
val mayCsv: Option[GEntity] = space.reconstitute(datasource)
mayCsv must beSome[GEntity]
val csv = mayCsv.get.asInstanceOf[CsvEntity]
csv.open()
csv.width must be(3)
csv.height must be(2)
csv.get(0, 0) must be_==("A") • Specs
csv.get(1, 0) must be_==("B")
csv.get(2, 0) must be_==("C")
csv.get(0, 1) must be_==("X")
csv.get(1, 1) must be_==("Y") • Scala
csv.get(2, 1) must be_==("Z")
csv.close()
}

2010 5 18

SimpleModeler

case class DER extends DomainResource { • DSL
term = " "
caption = " "
brief = <t></t>
description = <text></text>
• Scala DSL
id(" Id", DVI Id())
attribute(" Name", DVN Name())
} Google App
case class DVI Id extends DomainValueId { Engine Java
term = " Id"
caption = " Id"
brief = <t></t>
description = <text></text>

attribute("value", XString)
}

2010 5 18

SimpleModeler

2010 5 18

g3

•
class Join extends G3Application {
agent('compute) {
case x: Int => x + 100
• Scala DSL
}

start(List(1, 2, 3, 4, 5)) split() publish("compute") join() aggregate()
}

2010 5 18

class MyTodo extends Todo { • TODO
name = " " Scala DSL

" " until 20100505
• Scala DSL HTML
" " until 20100606
" " until 20100707

task(" ") {
until = 20100808
todo("PC ")
"IDE " until 20100707
}
}

2010 5 18

DSL HTML

<html>
<head>
<title>TODO </title>
</head>
<body>

<ul>
<li> (20100505)</li>
<li> (20100606)</li>
<li> (20100707)</li>
<li>PC (20100808) [ ]</li>
<li>IDE (20100808) [ ]</li>
</ul>

</body>
</html>

2010 5 18

class MyTodo extends Todo {
name = " "
}

abstract class Todo {
var name: String = _
}

2010 5 18

name = " "
import scala.collection.mutable.ArrayBuffer
todo(" ")
todo(" ") abstract class Todo {
todo(" ") val items = new ArrayBuffer[TodoItem]
}
def todo(title: String) {
val item = new TodoItem(title)
items += item
}
}

class TodoItem(val title: String) {
}

2010 5 18

name = " " abstract class Todo {
val items = new ArrayBuffer[TodoItem]
todo(" ") until 20100505
def todo(title: String): TodoItem = {
todo(" ") until 20100606 val item = new TodoItem(title)
todo(" ") until 20100707 items += item
item
} }
}

var untilDate: Int = _

def until(date: Int): TodoItem = {
untilDate = date
this
}
}

2010 5 18
(ﬂuent interface)

name = " " abstract class Todo {
" " until 20100505
" " until 20100606 val item = new TodoItem(title)
items += item
" " until 20100707 item
}
}
implicit def todoWrapper(title: String): TodoItem =
todo(title)
}

var untilDate: Int = _

def until(date: Int): TodoItem = {
untilDate = date
this
}
}

2010 5 18

name = " "

" " until 20100505
" " until 20100606
" " until 20100707

task(" ") {
todo("PC ")
"IDE " until 20100707
}
}

2010 5 18

class TodoItem(var title: String) {
abstract class Todo { var untilDate: Int = _
val items = new ArrayBuffer[TodoItem] def until(date: Int): TodoItem = {
val tasks = new ArrayBuffer[Task] untilDate = date
private[this] var currentTask: Option[Task] = None this
}
def todo(title: String): TodoItem = { }
val item = new TodoItem(title)
currentTask match { class Task(var title: String) {
case Some(tk) => tk.items += item val items = new ArrayBuffer[TodoItem]
case None => items += item var untilDate: Int = _
} }
item
}

def task(title: String)(p: => Unit): Task = {
val tk = new Task(title)
tasks += tk
currentTask = Some(tk)
p
currentTask = None
tk
}

implicit def todoWrapper(title: String): TodoItem = todo(title)
}

2010 5 18
Stack

name = " "

" " until 20100505
" " until 20100606
" " until 20100707

task(" ") {
until = 20100808
todo("PC ")
"IDE " until 20100707
}
}

2010 5 18

def until: Int = {
abstract class Todo { currentTask.get.untilDate
var name: String = _ }
val tasks = new ArrayBuffer[Task] def until_=(value: Int) {
private[this] var currentTask: Option[Task] = None currentTask.get.untilDate = value
}
val item = new TodoItem(title) implicit def todoWrapper(title: String): TodoItem = todo(title)
currentTask match { }
case Some(tk) => tk.items += item
case None => items += item class TodoItem(var title: String) {
} var untilDate: Int = _
item
} def until(date: Int): TodoItem = {
untilDate = date
def task(title: String)(p: => Unit): Task = { this
val tk = new Task(title) }
tasks += tk }
currentTask = Some(tk)
p class Task(var title: String) {
currentTask = None val items = new ArrayBuffer[TodoItem]
tk var untilDate: Int = _
} }
this
}
}

2010 5 18

MakeTodoDsl
import scala.xml.{XML, Node}
private def makeList(todo: Todo): List[Node] = {
object MakeTodoDsl { (for (item <- todo.items) yield <li>{
def main(args: Array[String]) { "%s(%s)".format(item.title, item.untilDate)
val input = args(0) }</li>).toList :::
val output = args(1) (for (task <- todo.tasks; item <- task.items) yield <li>{
"%s(%s) [%s]".format(item.title, task.untilDate, task.title)
val appClass = Class.forName(input) }</li>).toList
val todo = appClass.newInstance.asInstanceOf[Todo] }
}
val html = <html>
<head>
</head>
<body>

<ul>
{ makeList(todo) }
</ul>

</body>
</html>

XML.save(output, html, "utf-8")
}

2010 5 18

def main(args: Array[String]) {
val input = args(0)
val output = args(1)

val appClass = Class.forName(input)
val todo = appClass.newInstance.asInstanceOf[Todo]

2010 5 18

XML
val html = <html>
<head>
</head>
<body>

<ul>
{ makeList(todo) }
</ul>

</body>
</html>

XML.save(output, html, "utf-8")
}
2010 5 18

private def makeList(todo: Todo): List[Node] = {
(for (item <- todo.items) yield <li>{
"%s(%s)".format(item.title, item.untilDate)
}</li>).toList :::
(for (task <- todo.tasks; item <- task.items) yield <li>{
"%s(%s) [%s]".format(item.title, task.untilDate, task.title)}</li>
).toList
}

2010 5 18

DSL HTML

<html> •
<head>
</head>
<body>

<ul>
<li> (20100505)</li>
<li> (20100606)</li>
<li> (20100707)</li>
<li>PC (20100808) [ ]</li>
<li>IDE (20100808) [ ]</li>
</ul>

</body>
</html>

2010 5 18

• •

• •

• • XML

• •

• apply • (2.8)

• update • (2.8)

2010 5 18

• DSL Scala

• Scala Java …

•

• Scala DSL

•

• Scala

2010 5 18

Scala DSLの作り方

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Scala DSLの作り方