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package dotty.tools
package dotc
package transform
import org.junit.{Assert, Test}
import TreeTransforms.{TransformerInfo, TreeTransformer, MiniPhaseTransform}
import ast.tpd
import core.Constants.Constant
import core.Contexts.Context
class TreeTransformerTest extends DottyTest {
@Test
def shouldReturnSameTreeIfUnchanged = checkCompile("frontend", "class A{ val d = 1}") {
(tree, context) =>
implicit val ctx = context
class EmptyTransform extends MiniPhaseTransform {
override def phaseName: String = "empty"
init(ctx, ctx.period.firstPhaseId, ctx.period.lastPhaseId)
}
val transformer = new TreeTransformer {
override def miniPhases = Array(new EmptyTransform)
override def phaseName: String = "test"
}
val transformed = transformer.macroTransform(tree)
Assert.assertTrue("returns same tree if unmodified",
tree eq transformed
)
}
// Disabled, awaiting resolution. @Test
def canReplaceConstant = checkCompile("frontend", "class A{ val d = 1}") {
(tree, context) =>
implicit val ctx = context
class ConstantTransform extends MiniPhaseTransform {
override def transformLiteral(tree: tpd.Literal)(implicit ctx: Context, info: TransformerInfo): tpd.Tree = tpd.Literal(Constant(2))
override def phaseName: String = "canReplaceConstant"
init(ctx, ctx.period.firstPhaseId, ctx.period.lastPhaseId)
}
val transformer = new TreeTransformer {
override def miniPhases = Array(new ConstantTransform)
override def phaseName: String = "test"
}
val transformed = transformer.macroTransform(tree)
Assert.assertTrue("returns same tree if unmodified",
transformed.toString.contains("List(ValDef(Modifiers(,,List()),d,TypeTree[TypeRef(ThisType(module class scala),Int)],Literal(Constant(2)))")
)
}
@Test
def canOverwrite = checkCompile("frontend", "class A{ val d = 1}") {
(tree, context) =>
implicit val ctx = context
class Transformation extends MiniPhaseTransform {
override def transformLiteral(tree: tpd.Literal)(implicit ctx: Context, info: TransformerInfo): tpd.Tree = tpd.Literal(Constant(-1))
override def phaseName: String = "canOverwrite"
override def transformValDef(tree: tpd.ValDef)(implicit ctx: Context, info: TransformerInfo): tpd.ValDef = {
Assert.assertTrue("transformation of children succeeded",
tree.rhs.toString == "Literal(Constant(-1))"
)
tpd.cpy.ValDef(tree)(rhs = tpd.Literal(Constant(2)))
}
init(ctx, ctx.period.firstPhaseId, ctx.period.lastPhaseId)
}
val transformer = new TreeTransformer {
override def miniPhases = Array(new Transformation)
override def phaseName: String = "test"
}
val tr = transformer.macroTransform(tree).toString
Assert.assertTrue("node can rewrite children",
tr.contains("Literal(Constant(2))") && !tr.contains("Literal(Constant(-1))")
)
}
@Test
def transformationOrder = checkCompile("frontend", "class A{ val d = 1}") {
(tree, context) =>
implicit val ctx = context
class Transformation1 extends MiniPhaseTransform {
override def phaseName: String = "transformationOrder1"
override def transformLiteral(tree: tpd.Literal)(implicit ctx: Context, info: TransformerInfo): tpd.Tree = {
Assert.assertTrue("correct constant",
tree.const.toString == "Constant(1)"
)
tpd.cpy.Literal(tree)(Constant(-1))
}
override def transformValDef(tree: tpd.ValDef)(implicit ctx: Context, info: TransformerInfo): tpd.ValDef = {
Assert.assertTrue("transformation of children succeeded",
tree.rhs.toString == "Literal(Constant(-1))"
)
tpd.cpy.ValDef(tree)(rhs = tpd.Literal(Constant(2)))
}
init(ctx, ctx.period.firstPhaseId, ctx.period.lastPhaseId)
}
class Transformation2 extends MiniPhaseTransform {
override def phaseName: String = "transformationOrder2"
override def transformValDef(tree: tpd.ValDef)(implicit ctx: Context, info: TransformerInfo): tpd.ValDef = {
Assert.assertTrue("transformation of children succeeded",
tree.rhs.toString == "Literal(Constant(2))"
)
tpd.cpy.ValDef(tree)(rhs = tpd.Literal(Constant(3)))
}
init(ctx, ctx.period.firstPhaseId, ctx.period.lastPhaseId)
}
val transformer = new TreeTransformer {
override def miniPhases = Array(new Transformation1, new Transformation2)
override def phaseName: String = "test"
}
val tr = transformer.macroTransform(tree).toString
Assert.assertTrue("node can rewrite children",
tr.contains("Literal(Constant(3))")
)
}
@Test
def invocationCount = checkCompile("frontend", "class A{ val d = 1}") {
(tree, context) =>
implicit val ctx = context
var transformed1 = 0
class Transformation1 extends MiniPhaseTransform {
override def phaseName: String = "invocationCount1"
override def transformLiteral(tree: tpd.Literal)(implicit ctx: Context, info: TransformerInfo): tpd.Tree = {
transformed1 += 1
Assert.assertTrue("correct constant",
tree.const.toString == "Constant(1)"
)
tpd.cpy.Literal(tree)(Constant(-1))
}
override def transformValDef(tree: tpd.ValDef)(implicit ctx: Context, info: TransformerInfo) = {
transformed1 += 1
Assert.assertTrue("transformation of children succeeded",
tree.rhs.toString == "Literal(Constant(-3))"
)
tpd.cpy.ValDef(tree)(rhs = transformFollowing(tpd.Literal(Constant(2))))
}
init(ctx, ctx.period.firstPhaseId, ctx.period.lastPhaseId)
}
var transformed2 = 0
class Transformation2 extends MiniPhaseTransform {
var constantsSeen = 0
override def phaseName: String = "invocationCount2"
override def transformLiteral(tree: tpd.Literal)(implicit ctx: Context, info: TransformerInfo): tpd.Tree = {
transformed2 += 1
constantsSeen match {
case 0 =>
Assert.assertTrue("correct constant",
tree.const.toString == "Constant(-1)"
)
case 1 =>
Assert.assertTrue("correct constant",
tree.const.toString == "Constant(2)"
)
case _ => Assert.fail("to many constants seen")
}
constantsSeen += 1
tpd.cpy.Literal(tree)(Constant(-3))
}
override def transformValDef(tree: tpd.ValDef)(implicit ctx: Context, info: TransformerInfo) = {
transformed2 += 1
Assert.assertTrue("transformation of children succeeded",
tree.rhs.toString == "Literal(Constant(-3))"
)
transformFollowing(tpd.cpy.ValDef(tree)(rhs = tpd.Literal(Constant(3))))
}
init(ctx, ctx.period.firstPhaseId, ctx.period.lastPhaseId)
}
val transformer = new TreeTransformer {
override def miniPhases = Array(new Transformation1, new Transformation2)
override def phaseName: String = "test"
}
val tr = transformer.macroTransform(tree).toString
Assert.assertTrue("transformations aren't invoked multiple times",
transformed1 == 2 && transformed2 == 3
)
}
}
|
