1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
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.filter(!isOptional(_)).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) => {
if (validate(name, parts.head)) {
route(parts.tail, components.tail, mapping + (name -> parts.head))
}
else {
route(parts, components.tail, mapping)
}
}
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
def pathWithMapping (mapping: Map[String, String]): Option[String] = {
val requiredDefaults = defaults.keys.filter { k =>
mapping.isDefinedAt(k) && !hasVariable(k)
}
if (requiredDefaults.forall(k => defaults(k) == mapping(k)) &&
requiredVariableComponents.forall(mapping.isDefinedAt)) {
val boundComponents = components.flatMap {
case Optional(v) => {
val component = (mapping get v).flatMap(validComponentValue(v, _))
defaults get v match {
case Some(default) => {
component.flatMap {
case `default` => None
case c => Some(c)
}
}
case None => component
}
}
case Variable(v) => validComponentValue(v, (mapping(v)))
case literal => Some(literal)
}
Some(boundComponents.mkString("/"))
}
else {
None
}
}
private lazy val components =
path.split("/").filter(_.length > 0)
lazy val requiredVariableComponents =
components.filter(!isOptional(_)).flatMap(getComponentName)
lazy val optionalVariableComponents =
components.filter(isOptional).flatMap(getComponentName)
lazy val hasVariable = components.flatMap(getComponentName).toSet
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
}
private def validComponentValue (
name: String,
component: String
): Option[String] = {
if (validate(name, component)) { Some(component) } else { None }
}
}
class Match[T] (
val path: String,
val mapping: Map[String, String],
val target: T
)
|
