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package scalatex.stages
import acyclic.file
import scala.reflect.macros.Context
import scala.reflect.internal.util.{Position, OffsetPosition}
/**
* Walks the parsed AST, converting it into an un-structured Scala source-blob
* which when compiled results in a function that can be used to generate the
* given Frag at runtime.
*/
object Compiler{
val WN = TwistNodes
def apply(c: Context)(literalPos: c.Position, template: WN.Template): c.Tree = {
import c.universe._
def fragType = tq"scalatags.Text.all.Frag"
def posFor(offset: Int) = {
new OffsetPosition(
literalPos.source,
offset
).asInstanceOf[c.universe.Position]
}
def compileTree(frag: WN.TemplateTree): Tree = {
// println(frag)
val fragPos = posFor(literalPos.point + frag.offset)
def fragPosFor(offset: Int) = {
println(posFor(fragPos.point + offset))
posFor(fragPos.point + offset)
}
def atFragPos(t: Tree, offset: Int) = {
println(t)
atPos(fragPosFor(offset))(t)
}
def setFragPos(t: Tree, offset: Int) = {
println(t)
c.internal.setPos(t, fragPosFor(offset))
t
}
// println(s"${frag.offset}\n${literalPos.point}\n${pos.point}\n$frag\n")
val f: Tree = frag match {
case WN.Plain(text, offset) => atPos(fragPos)(q"$text")
case WN.Display(exp, offset) => compileTree(exp)
case WN.Comment(msg, offset) => q""
case WN.ScalaExp(Seq(WN.Simple(first, _), WN.Block(ws, args, content, _)), offset)
if first.startsWith("for(") =>
val fresh = c.fresh()
val skeleton: Tree = c.parse(first + s"{$fresh}").asInstanceOf[Apply]
// println("FIRST " + first)
skeleton.foreach{x =>
x
if (x.pos != NoPosition) setFragPos(x, x.pos.point + 1)
}
val b = content.map(compileTree(_))
def rec(t: Tree): Tree = t match {
case a @ Apply(fun, List(f @ Function(vparams, body))) =>
val f2 = Function(vparams, rec(body))
val a2 = Apply(fun, List(f2))
atPos(a.pos)(a2)
atPos(f.pos)(f2)
a2
case Ident(x: TermName) if x.decoded == fresh =>
q"Seq[$fragType](..$b)"
}
rec(skeleton)
case WN.ScalaExp(WN.Simple(first, _) +: WN.Block(_, None, content1, _) +: rest, offset)
if first.startsWith("if(") =>
val b1 = content1.map(compileTree(_))
val tree = c.parse(first + "{}").asInstanceOf[If]
tree.foreach{x =>
setFragPos(x, x.pos.point + 1)
}
val If(cond, _, _) = tree
val b2 = rest match{
case Seq(WN.Simple(next, _), WN.Block(_, None, content2, _)) =>
content2.map(compileTree(_))
case Seq() => Nil
}
q"if($cond){ Seq[$fragType](..$b1): $fragType } else { Seq[$fragType](..$b2): $fragType }"
case xx @ WN.ScalaExp(WN.Simple(first, _) +: rest, offset) =>
val firstTree = c.parse(first)
firstTree.foreach{x =>
setFragPos(x, x.pos.point)
}
val s = rest.foldLeft[Tree](firstTree) {
case (l, WN.Simple(code, _)) =>
val fresh = c.fresh()
val snippet = s"$fresh$code"
val skeleton = c.parse(snippet)
def rec(t: Tree): Tree = {
val res = t match {
case Apply(fun, args) =>
for(arg <- args; tree <- arg if tree.pos != NoPosition){
c.internal.setPos(tree, fragPosFor(tree.pos.point + first.length - fresh.length))
}
Apply(rec(fun), args)
case Select(qualifier, name) => Select(rec(qualifier), name)
case Ident(x: TermName) if x.decoded == fresh => l
}
atFragPos(res, t.pos.point + first.length - fresh.length)
// println(Position.formatMessage(newPos.asInstanceOf[scala.reflect.internal.util.Position], "", true))
res
}
rec(skeleton)
case (l, WN.Block(ws, None, content, offset)) =>
val contentTrees = content.map(compileTree(_))
atFragPos(q"$l(..$contentTrees)", offset)
case (l, WN.Block(ws, Some(args), content, offset)) =>
val snippet = s"{$args ()}"
val skeleton = c.parse(snippet)
val Function(vparams, body) = skeleton
vparams.map(_.foreach { t =>
if (t.pos != NoPosition)
setFragPos(t, t.pos.point)
})
val contentTrees = content.map{compileTree(_)}
val func = Function(vparams, q"Seq[$fragType](..$contentTrees)")
atFragPos(func, skeleton.pos.point)
val res = q"$l($func)"
atFragPos(res, offset)
res
}
s
}
f
}
def compileTemplate(tmpl: WN.Template): Tree = {
val WN.Template(name, comment, params, topImports, imports, subs, content, offset) = tmpl
val fullName = if (name.toString == "") c.fresh("outer") else name
val DefDef(mods, realName, tparams, vparamss, tpt, rhs) = {
val snippet = s"def $fullName$params = {}"
val z = c.parse(snippet).asInstanceOf[DefDef]
z
}
val innerDefs = subs.map(compileTemplate(_))
val body = atPos(literalPos)(q"""{
..${topImports.map(i => c.parse(i.code))}
..$innerDefs
Seq[scalatags.Text.all.Frag](..${content.map(compileTree(_))})
}""")
if (name.toString == "") body
else DefDef(mods, realName, tparams, vparamss, tpt, body)
}
atPos(literalPos)(q"${compileTemplate(template)}")
}
}
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