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CodeGen.scala
50 lines (41 loc) · 1.67 KB
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CodeGen.scala
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package slick.compiler
import slick.ast.TypeUtil.:@
import slick.ast._
import slick.util.SlickLogger
/** A standard skeleton for a code generator phase. */
abstract class CodeGen extends Phase {
val name = "codeGen"
override protected[this] lazy val logger = SlickLogger[CodeGen]
def apply(state: CompilerState): CompilerState = state.map(n => apply(n, state))
def apply(node: Node, state: CompilerState): Node =
ClientSideOp.mapResultSetMapping(node, keepType = true) { rsm =>
var nmap: Option[Node] = None
var compileMap: Option[Node] = Some(rsm.map)
val nfrom = ClientSideOp.mapServerSide(rsm.from, keepType = true) { ss =>
logger.debug("Compiling server-side and mapping with server-side:", ss)
val (nss, nmapOpt) = compileServerSideAndMapping(ss, compileMap, state)
nmapOpt match {
case Some(_) =>
nmap = nmapOpt
compileMap = None
case None =>
}
logger.debug("Compiled server-side to:", nss)
nss
}
rsm.copy(from = nfrom, map = nmap.get) :@ rsm.nodeType
}
def compileServerSideAndMapping(serverSide: Node, mapping: Option[Node], state: CompilerState): (Node, Option[Node])
/** Extract the source tree and type, after possible CollectionCast operations, from a tree */
def treeAndType(n: Node): (Node, Type) = n match {
case CollectionCast(ch, _) :@ tpe => (treeAndType(ch)._1, tpe)
case n => (n, n.nodeType)
}
}
object CodeGen {
def findResult(n: Node): (String, Any) = n match {
case r @ ResultSetMapping(_, from, _) => findResult(from)
case f @ First(from) => findResult(from)
case CompiledStatement(st, ex, _) => (st, ex)
}
}