tscfg.generators.TemplateGenerator.scala Maven / Gradle / Ivy
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package tscfg.generators
import tscfg.model._
case class TemplateOpts(indent: String = " ", commentPrefix: String = "##")
class TemplateGenerator(opts: TemplateOpts) {
def generate(o: ObjectType): String = genObjectTypeMembers(o)
private def genEnumType(et: EnumObjectType): String = {
s"[${et.members.mkString(", ")}]"
}
private def genObjectType(o: ObjectRealType): String = {
val members =
opts.indent + genObjectTypeMembers(o).replaceAll("\n", "\n" + opts.indent)
s"""{
|$members
|}""".stripMargin
}
private def genObjectTypeMembers(o: ObjectRealType): String = {
val symbols = o.members.keys.toList.sorted
symbols
.map { symbol =>
val a = o.members(symbol)
val (annotations, comments) = a.comments match {
case None => (List.empty, List.empty)
case Some(str) =>
val lines = str.split("\n").toList.filterNot(_.startsWith("!"))
lines.partition(_.startsWith("@"))
}
val cmn =
if (comments.isEmpty) ""
else {
opts.commentPrefix + comments.mkString(
"\n" + opts.commentPrefix
) + "\n"
}
val opt = if (a.optional) "optional" else "required"
a.t match {
case _: EnumObjectType =>
val decl = opts.commentPrefix + s" '$symbol': Enumeration.\n"
val (typ, _) = gen(a.t)
val assign = symbol + " = " + typ
decl +
cmn +
assign
case _ =>
val dfl = a.default.map(d => s". Default: $d").getOrElse("")
val (typ, abbrev) = gen(a.t)
val abbrev2 = if (abbrev == abbrevObject) "section" else abbrev
val decl = opts.commentPrefix + s" '$symbol': $opt $abbrev2$dfl.\n"
val sysPropOpt: Option[String] = annotations
.find(_.startsWith(sysPropAnn))
.map(_.substring(sysPropAnn.length).trim)
val envVarOpt: Option[String] = annotations
.find(_.startsWith(envVarAnn))
.map(_.substring(envVarAnn.length).trim)
val assign =
if (abbrev == abbrevObject)
symbol + " " + typ // do not include `=' for an object
else if (isBasicAbbrev(abbrev))
symbol + " = " + "?"
else
symbol + " = " + typ
val assignSysProp =
sysPropOpt.map(e => s"\n$symbol = $${$e}").getOrElse("")
val assignEnvVar =
envVarOpt.map(e => s"\n$symbol = $${?$e}").getOrElse("")
decl +
cmn +
(if (a.optional) "#" + assign.replaceAll("\n", "\n#")
else assign) +
assignSysProp +
assignEnvVar
}
}
.mkString("\n\n")
}
private def gen(typ: Type): (String, String) = typ match {
case o: ObjectType =>
(genObjectType(o), abbrevObject)
case aot: AbstractObjectType =>
(genObjectType(aot), abbrevAbsObject)
case ObjectRefType(ns, simpleName) =>
(simpleName, simpleName)
case b: BasicType =>
val lc = b.toString.toLowerCase
(lc, lc)
case ListType(t) =>
val (subTyp, abbrev) = gen(t)
(s"[$subTyp, ...]", abbrevListOf + " " + abbrev)
case et: EnumObjectType =>
(genEnumType(et), abbrevEnum)
}
private def isBasicAbbrev(abbrev: String): Boolean =
abbrev != abbrevEnum &&
abbrev != abbrevObject && abbrev != abbrevAbsObject &&
!abbrev.startsWith(abbrevListOf)
private val abbrevEnum = "enumeration"
private val abbrevObject = "object"
private val abbrevAbsObject = "abstract class"
private val abbrevListOf = "list of"
private val envVarAnn = "@envvar"
private val sysPropAnn = "@sysprop"
}