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package router
import scala.collection.mutable.ArrayBuffer
import scala.util.matching.Regex
class Router[T] {
val routes = new ArrayBuffer[Route[T]]()
def addRoute (
path: String,
target: T,
defaults: Map[String, String] = Map(),
validations: Map[String, Regex] = Map()
) {
routes += new Route(path, defaults, validations, target)
}
def insertRoute (
path: String,
target: T,
defaults: Map[String, String] = Map(),
validations: Map[String, Regex] = Map(),
at: Int = 0
) {
routes insert (
at min routes.length,
new Route(path, defaults, validations, target)
)
}
def route (path: String): Option[Match[T]] = {
def _route (
components: Seq[String],
routes: List[Route[T]]
): Option[Match[T]] = routes match {
case r :: rs => r.route(components) match {
case Some(found) => Some(found)
case None => _route(components, rs)
}
case _ => None
}
_route(path.split("/"), routes.toList)
}
def uriFor (mapping: Map[String, String]): String = {
throw new Error("unimplemented")
}
}
class Route[T] (
val path: String,
val defaults: Map[String, String],
val validations: Map[String, Regex],
val target: T
) {
def route(
parts: Seq[String],
components: Seq[String] = components,
mapping: Map[String, String] = defaults
): Option[Match[T]] = {
if (components.length == 0 && parts.length == 0) {
Some(new Match[T](path, mapping, target))
}
else if (components.length == 0 || parts.length == 0) {
None
}
else {
components.head match {
case Optional(name) => {
throw new Error("unsupported")
}
case Variable(name) => {
if (validate(name, parts.head)) {
route(parts.tail, components.tail, mapping + (name -> parts.head))
}
else {
None
}
}
case literal => parts.head match {
case `literal` => route(parts.tail, components.tail, mapping)
case _ => None
}
}
}
}
override def toString = path
private lazy val components =
path.split("/").filter(_.length > 0)
private lazy val length =
components.length
private lazy val lengthWithoutOptionals =
components.filter(!isOptional(_)).length
private lazy val requiredVariableComponentNames =
for (c <- components if isVariable(c) && !isOptional(c))
yield getComponentName(c)
private lazy val optionalVariableComponentNames =
for (c <- components if isVariable(c) && isOptional(c))
yield getComponentName(c)
private val Optional = """^\?:(.*)$""".r
private val Variable = """^\??:(.*)$""".r
private def isOptional (component: String): Boolean = component match {
case Optional(_) => true
case _ => false
}
private def isVariable (component: String): Boolean = component match {
case Variable(_) => true
case _ => false
}
private def getComponentName (component: String) = component match {
case Variable(name) => Some(name)
case _ => None
}
private def validate (name: String, component: String): Boolean =
validations get name match {
case Some(rx) => rx.findFirstIn(component).nonEmpty
case None => true
}
}
class Match[T] (
val path: String,
val mapping: Map[String, String],
val target: T
)
|
