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import scala.reflect.internal.util.{BatchSourceFile, SourceFile, OffsetPosition}
import scala.reflect.io.{PlainFile, AbstractFile}
import scala.reflect.macros.{TypecheckException, Context}
import scalatags.Text.all._
import scalatex.stages.{Parser, Compiler}
import scala.language.experimental.macros
import acyclic.file
package object scalatex {
/**
* Wraps the given string as a twist fragment.
*/
def tw(expr: String): Frag = macro Internals.applyMacro
def twf(filename: String): Frag = macro Internals.applyMacroFile
object Internals {
def twRuntimeErrors(expr: String): Frag = macro applyMacroRuntimeErrors
def twDebug(expr: String): Frag = macro applyMacroDebug
def applyMacro(c: Context)(expr: c.Expr[String]): c.Expr[Frag] = applyMacroFull(c)(expr, false, false)
def applyMacroDebug(c: Context)(expr: c.Expr[String]): c.Expr[Frag] = applyMacroFull(c)(expr, false, true)
def applyMacroRuntimeErrors(c: Context)(expr: c.Expr[String]): c.Expr[Frag] = applyMacroFull(c)(expr, true, false)
def applyMacroFile(c: Context)(filename: c.Expr[String]): c.Expr[Frag] = {
import c.universe._
val fileName = filename.tree
.asInstanceOf[Literal]
.value
.value
.asInstanceOf[String]
val txt = io.Source.fromFile(fileName).mkString
val sourceFile = new BatchSourceFile(
new PlainFile(fileName),
txt.toCharArray
)
compileThing(c)(txt, sourceFile, 0, false, false)
}
case class DebugFailure(msg: String, pos: String) extends Exception(msg)
private[this] def applyMacroFull(c: Context)
(expr: c.Expr[String],
runtimeErrors: Boolean,
debug: Boolean)
: c.Expr[Frag] = {
import c.universe._
val scalatexFragment = expr.tree
.asInstanceOf[Literal]
.value
.value
.asInstanceOf[String]
val stringStart =
expr.tree
.pos
.lineContent
.drop(expr.tree.pos.column)
.take(2)
compileThing(c)(
scalatexFragment,
expr.tree.pos.source,
expr.tree.pos.point + (if (stringStart == "\"\"") 1 else -1),
runtimeErrors,
debug
)
}
}
def compileThing(c: Context)
(scalatexSource: String,
source: SourceFile,
point: Int,
runtimeErrors: Boolean,
debug: Boolean) = {
import c.universe._
def compile(s: String): c.Tree = {
val realPos = new OffsetPosition(source, point).asInstanceOf[c.universe.Position]
Compiler(c)(realPos, Parser.tupled(stages.Trim(s)))
}
import c.Position
try {
val compiled = compile(scalatexSource)
if (debug) println(compiled)
c.Expr[Frag](c.typeCheck(compiled))
} catch {
case e@TypecheckException(pos: Position, msg) =>
if (!runtimeErrors) c.abort(pos, msg)
else {
val posMsg = pos.lineContent + "\n" + (" " * pos.column) + "^"
c.Expr( q"""throw scalatex.Internals.DebugFailure($msg, $posMsg)""")
}
}
}
}
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