com.github.plokhotnyuk.jsoniter_scala.macros.NameMapper.scala Maven / Gradle / Ivy
package com.github.plokhotnyuk.jsoniter_scala.macros
import scala.quoted._
private[macros] sealed trait NameMapper:
def apply(input: String)(using Quotes): Option[String]
private[macros] class PartialFunctionWrapper(fun: PartialFunction[String, String]) extends NameMapper:
def apply(input: String)(using Quotes): Option[String] = fun.lift(input)
private[macros] class ExprPartialFunctionWrapper(fun: Expr[PartialFunction[String, String]]) extends NameMapper:
def apply(input: String)(using Quotes): Option[String] = CompileTimeEval.evalApplyString(fun, input)
private[macros] case class FromExprException(name: String, expr: Expr[Any]) extends RuntimeException
private[macros] object NameMapper {
given Conversion[PartialFunction[String, String], NameMapper] with
inline def apply(pf: PartialFunction[String, String]) = PartialFunctionWrapper(pf)
given Conversion[Function[String, String], NameMapper] with
inline def apply(f: Function[String, String]) = PartialFunctionWrapper({ case x => f(x) })
given FromExpr[NameMapper] with {
def unapply(x: Expr[NameMapper])(using Quotes): Option[NameMapper] = {
import quotes.reflect._
if (x.asTerm.tpe <:< TypeRepr.of[PartialFunctionWrapper]) {
PartialFunctionWrapper.toExprWrapper(x.asExprOf[PartialFunctionWrapper])
} else if (x.asTerm.tpe <:< TypeRepr.of[ExprPartialFunctionWrapper]) {
throw new FromExprException("Double application of FromExpr ", x)
} else throw new FromExprException("FieldNameMapper", x)
}
}
}
private[macros] object PartialFunctionWrapper {
def toExprWrapper(x: Expr[PartialFunctionWrapper])(using Quotes): Option[ExprPartialFunctionWrapper] = x match
case '{ PartialFunctionWrapper($fun) } => Some(ExprPartialFunctionWrapper(fun))
case _ => throw new FromExprException("FieldNameExpr", x)
}
private[macros] object CompileTimeEval {
case class CompileTimeEvalException(message: String, expr: Expr[Any], reason: Throwable = null)
extends RuntimeException(message, reason)
def evalApplyString(fun: Expr[PartialFunction[String, String]], input: String)(using Quotes): Option[String] =
new QuoteScope().evalApplyString(fun, input)
def evalExpr[T: Type](expr: Expr[T])(using Quotes): Expr[T] = new QuoteScope().evalExpr(expr)
class QuoteScope(using Quotes) {
import quotes.reflect._
def evalApplyString(fun: Expr[PartialFunction[String, String]], input: String): Option[String] =
if (fun.asTerm.tpe <:< TypeRepr.of[Map[String, String]]) {
evalApplyStringMap(fun.asExprOf[Map[String, String]], input)
} else evalApplyStringTerm(fun.asTerm, input, Map.empty)
def evalApplyStringMap(m: Expr[Map[String, String]], input: String): Option[String] = m match
case '{ Map(${Varargs(args)}) } =>
args.map(a => summon[FromExpr[(String, String)]].unapply(a.asExprOf[(String, String)]))
.collectFirst { case Some((k, v)) if (k == input) => v }
case _ => throw CompileTimeEvalException(s"Map ${m.show} should be a constrictoor literal, we have ${m.asTerm}", m)
def evalExpr[T: Type](expr: Expr[T]): Expr[T] = evalTerm(expr.asTerm, Map.empty, None).asExprOf[T]
private def evalApplyStringTerm(ft: Term, input: String, bindings: Map[Symbol, Term]): Option[String] =
ft match
case Inlined(_, inlineBindings, body) =>
evalApplyStringTerm(body, input, addBindings(ft, bindings, inlineBindings))
case _ =>
val inputLiteral = Literal(StringConstant(input))
val nullTerm = Literal(NullConstant())
val termResult = ft match
case Lambda(params, body) => params match
case List(param) => evalTerm(body, bindings.updated(param.symbol, inputLiteral), Some(nullTerm))
case _ =>
throw CompileTimeEvalException(s"Expected that partial function have one parameter ${ft.show}", ft.asExpr)
case _ =>
if (ft.tpe <:< TypeRepr.of[PartialFunction[_, _]]) {
val isDefinedTerm =
try Apply(Select.unique(ft, "isDefinedAt"), List(inputLiteral)) catch {
case ex: Throwable =>
throw CompileTimeEvalException(s"Can't create isDefinedAt call for $ft: ${ex.getMessage}", ft.asExpr, ex)
}
val applyTerm =
try Apply(Select.unique(ft, "apply"), List(inputLiteral)) catch {
case ex: Throwable =>
throw CompileTimeEvalException(s"Can't create apply call for $ft: ${ex.getMessage}", ft.asExpr, ex)
}
if (evalCondition(isDefinedTerm, bindings)) evalTerm(applyTerm, bindings, None)
else nullTerm
} else if (ft.tpe <:< TypeRepr.of[Function[_, _]]) {
val applyTerm =
try Apply(Select.unique(ft, "apply"), List(inputLiteral)) catch {
case ex: Throwable =>
throw CompileTimeEvalException(s"Can't create apply call for $ft: ${ex.getMessage}", ft.asExpr, ex)
}
evalApply(applyTerm, bindings)
} else {
throw CompileTimeEvalException(s"PartialFunction[String, String] or Function[String, String] is required, we have ${ft.tpe.show}", ft.asExpr)
}
termToOptString(termResult)
private def evalTerm(ft: quotes.reflect.Term, bindings: Map[Symbol, Term], optDefault: Option[Term]): Term = {
import quotes.reflect._
ft match
case Inlined(_, inlineBindings, body) =>
evalTerm(body, addBindings(ft, bindings, inlineBindings), optDefault)
case id@Ident(_) => bindings.get(id.symbol) match
case Some(term) => evalTerm(term, bindings, optDefault)
case None => throw CompileTimeEvalException(s"Unknown symbol: $id, bindigns=$bindings", ft.asExpr)
case m@Match(_, _) => evalMatch(m, bindings, optDefault)
case If(cond, ifTrue, ifFalse) =>
if (evalCondition(cond, bindings)) evalTerm(ifTrue, bindings, optDefault)
else evalTerm(ifFalse, bindings, optDefault)
case app@Apply(_, _) => evalApply(app, bindings)
case block@Block(_, _) => evalBlock(block, bindings, optDefault)
case lt@Literal(_) => lt
case Typed(expr, tpt) => evalTerm(expr, bindings, optDefault)
case other => throw CompileTimeEvalException(s"Unsupported constant expression: $other", ft.asExpr)
}
private def evalMatch(t: Match, bindings: Map[Symbol, Term], optDefault: Option[Term]): Term =
val scrutinee = evalTerm(t.scrutinee, bindings, None)
var result: Option[Term] = None
var cases = t.cases
while (!cases.isEmpty && result.isEmpty) {
result = evalCaseDef(t, cases.head, scrutinee, bindings, optDefault)
cases = cases.tail
}
result match
case Some(value) => value
case None => optDefault.getOrElse(throw CompileTimeEvalException(s"Match failed and no default: scrutinee=$scrutinee\nmatch: ${t.show}\nbindings: ${bindings}\nmatch tree: $t\n", t.asExpr))
private def evalCaseDef(m: Term, caseDef: CaseDef, scrutinee: Term, bindings: Map[Symbol, Term],
optDefault: Option[Term]): Option[Term] =
evalCaseDefPattern(m, caseDef.pattern, scrutinee, bindings).flatMap { newBinding =>
caseDef.guard match
case Some(guard) =>
if (evalCondition(guard, newBinding)) Some(evalTerm(caseDef.rhs, newBinding, optDefault))
else None
case None =>
Some(evalTerm(caseDef.rhs, newBinding, optDefault))
}
private def evalCaseDefPattern(m: Term, pattern: Tree, scrutinee: Term,
bindings: Map[Symbol, Term]): Option[Map[Symbol, Term]] =
pattern match
case TypedOrTest(v, tpt) =>
evalCaseDefPattern(m, v, scrutinee, bindings).flatMap { newBinding =>
if (scrutinee.tpe <:< tpt.tpe) Some(newBinding)
else None
}
case b@Bind(_, tree) =>
evalCaseDefPattern(m, tree, scrutinee, bindings).map { newBindings =>
tree match
case ct: Term => newBindings.updated(b.symbol, ct)
case _ => newBindings.updated(b.symbol, scrutinee)
}
case Unapply(fun, _, _) => // TODO: implement regexpr ?
throw CompileTimeEvalException(s"Unapply $fun is not supported in compile-time pattern", m.asExpr)
case Alternatives(cases) =>
var c = cases
var retval: Option[Map[quotes.reflect.Symbol, quotes.reflect.Term]] = None
while (!c.isEmpty) {
retval = evalCaseDefPattern(m, c.head, scrutinee, bindings)
c = c.tail
}
retval
case Wildcard() =>
Some(bindings.updated(pattern.symbol, scrutinee))
case lit@Literal(_) =>
if (evalLitEquals(lit, scrutinee, bindings)) Some(bindings)
else None
case other =>
throw CompileTimeEvalException(s"Pattern $other is not supported in compile-time evaluation", m.asExpr)
private def evalApply(applyTerm: Apply, bindings: Map[Symbol, Term]): Term =
evalApply2(applyTerm, applyTerm.fun, applyTerm.args.map(x => evalTerm(x, bindings, None)), bindings)
private def evalApply2(posTerm: Term, fun: Term, args: List[Term], bindings: Map[Symbol, Term]): Term = fun match
case Inlined(_, inlineBindings, body) =>
evalApply2(posTerm, body, args, addBindings(posTerm, bindings, inlineBindings))
case Select(qual, memberName) =>
evalApplySelect(posTerm, qual, memberName, args, bindings)
case other =>
val funSym = other.symbol
if (funSym.flags.is(Flags.Module)) applyJavaReflectModule(posTerm, funSym, args) // TODO: test
else throw new CompileTimeEvalException(s"Expected that $funSym is a module", posTerm.asExpr)
private def evalApplySelect(posTerm: Term, qual: Term, memberName: String, args: List[Term],
bindings: Map[Symbol, Term]): Term = {
def runIsDefinedAt(fun: Term): Boolean =
evalApplySelect(posTerm, fun, "isDefinedAt", args, bindings) match
case Literal(BooleanConstant(v)) => v
case other => throw new CompileTimeEvalException(
s"Expected that isDefined returns boolean, we have $other\nfun = ${fun.show}", posTerm.asExpr)
qual match
case Inlined(_, inlineBindings, body) =>
evalApplySelect(body, body, memberName, args, addBindings(posTerm, bindings, inlineBindings))
case Select(qual1, name1) =>
if (qual1.symbol.fullName == "com.github.plokhotnyuk.jsoniter_scala.macros.JsonCodecMaker") {
applyJsonCodeMakerField(posTerm, name1, memberName, args)
} else jvmToTerm(posTerm, javaReflectionCall(posTerm, evalQualJvm(qual, bindings), memberName, args))
case Lambda(_, _) =>
if (memberName == "apply") {
val nApply = Select.unique(qual,"apply").appliedToArgs(args) // TODO: pass symbol instead using Select.unique
Term.betaReduce(nApply) match
case Some(term) => evalTerm(term, bindings, None)
case None => throw new CompileTimeEvalException(s"Can't beta-reduce $nApply", posTerm.asExpr)
} else {
throw new CompileTimeEvalException(s"Expected that lambda call memeber name is 'apply', we have $memberName", posTerm.asExpr)
}
case Apply(TypeApply(Select(frs, "andThen"), List(stringTpt)), List(snd)) =>
if (memberName == "isDefinedAt") {
if (runIsDefinedAt(frs)) {
val r1 = evalApplySelect(posTerm, frs, "apply", args, bindings)
evalApplySelect(posTerm, snd, "isDefinedAt", List(r1), bindings)
} else Literal(BooleanConstant(false))
} else if (memberName == "apply") {
val r1 = evalApplySelect(posTerm, frs, "apply", args, bindings)
evalApplySelect(posTerm, snd, "apply", List(r1), bindings)
} else {
throw new CompileTimeEvalException(s"Expected that parial function methods are 'isDefinedAt' and 'apply', we have $memberName", posTerm.asExpr)
}
case Apply(TypeApply(Select(frs, "orElse"), List(stringTpt)), List(snd)) =>
if (memberName == "isDefinedAt") {
if (runIsDefinedAt(frs)) Literal(BooleanConstant(true))
else evalApplySelect(posTerm, snd, "isDefinedAt", args, bindings)
} else if (memberName == "apply") {
if (runIsDefinedAt(frs)) evalApplySelect(posTerm, frs, "apply", args, bindings)
else evalApplySelect(posTerm, snd, "apply", args, bindings)
} else {
throw new CompileTimeEvalException(s"expected that parial function methods are 'isDefinedAt' and 'apply', we have $memberName", posTerm.asExpr)
}
case other =>
jvmToTerm(posTerm, javaReflectionCall(posTerm, evalQualJvm(qual, bindings), memberName, args))
}
private def evalQualJvm(qual: Term, bindings: Map[Symbol, Term]): AnyRef =
if (qual.symbol.flags.is(Flags.Module)) retrieveRuntimeModule(qual, qual.symbol)
else {
qual match
case Inlined(_, inlineBindings, body) =>
evalQualJvm(body, addBindings(body, bindings, inlineBindings))
case id@Ident(_) =>
bindings.get(id.symbol) match
case Some(value) =>
termToJvm(evalTerm(value, bindings, None))
case None =>
throw new CompileTimeEvalException(s"Can't interpret '${id.show}' as constant expression", qual.asExpr)
case Select(qual1, name) =>
retrieveRuntimeField(evalQualJvm(qual1, bindings), name)
case Apply(Select(qual1, name), args) =>
javaReflectionCall(qual, evalQualJvm(qual1, bindings), name, args)
case If(cond, ifTrue, ifFalse) =>
if (evalCondition(cond, bindings)) evalQualJvm(ifTrue, bindings)
else evalQualJvm(ifFalse, bindings)
case _ => // this can be constant expression
termToJvm(evalTerm(qual, bindings, None))
}
private def evalCondition(term: Term, bindings: Map[Symbol, Term]): Boolean = evalTerm(term, bindings, None) match
case Literal(BooleanConstant(v)) => v
case other => throw CompileTimeEvalException(s"Condition should return boolean value, we have ${other.show}", term.asExpr)
private def evalBlock(block: Block, bindings: Map[Symbol, Term], optDefault: Option[Term]): Term =
var statements = block.statements
var b = bindings
while (statements.nonEmpty) {
statements.head match
case dfn: Definition => b = addDefinition(block, b, dfn)
case bt: Term => throw CompileTimeEvalException(s"Term as non-last block statement have no sence", bt.asExpr)
case _ => // ignore Import and Export
statements = statements.tail
}
evalTerm(block.expr, b, optDefault)
private def evalLitEquals(lhs: Literal, rhs: Term, bindings: Map[Symbol, Term]): Boolean = rhs match
case Literal(rconst) => lhs.constant.value == rconst.value
case _ => evalLitEquals(lhs, evalTerm(rhs, bindings, None), bindings)
private def addBindings(m: Term, x: Map[Symbol, Term], bindings: List[Definition]): Map[Symbol, Term] =
var r = x
var c = bindings
while (!c.isEmpty) {
r = addDefinition(m, r, c.head)
c = c.tail
}
r
private def addDefinition(m: Term, x: Map[quotes.reflect.Symbol, quotes.reflect.Term],
binding: quotes.reflect.Definition): Map[quotes.reflect.Symbol, quotes.reflect.Term] =
binding match
case vd@ValDef(_, _, optRhs) => optRhs match
case Some(rhs) => x.updated(vd.symbol, rhs)
case None => x
case other =>
throw CompileTimeEvalException(s"Definitions other then ValDefs is not supported, we have $other ", m.asExpr)
private def applyJsonCodeMakerField(t: Term, fieldName: String, operation: String, args: List[Term]): Term =
val arg = termToString(args.head)
val field: PartialFunction[String, String] = fieldName match {
case "partialIdentity" => JsonCodecMaker.partialIdentity
case "enforceCamelCase" => JsonCodecMaker.enforceCamelCase
case "EnforcePascalCase" => JsonCodecMaker.EnforcePascalCase
case "enforce_snake_case" => JsonCodecMaker.enforce_snake_case
case "enforce-kebab-case" => JsonCodecMaker.`enforce-kebab-case`
case _ => throw CompileTimeEvalException(s"Unknonwn JsonCodeMaker parial function field: $fieldName", t.asExpr)
}
operation match {
case "isDefinedAt" => Literal(BooleanConstant(field.isDefinedAt(arg)))
case "apply" => jvmToTerm(t, field.apply(arg))
case _ => throw CompileTimeEvalException(s"Expected isDefinedAt or Apply operations, we have: $operation", t.asExpr)
}
private def retrieveRuntimeModule(applyTerm: Term, sym: Symbol): AnyRef =
val className = sym.fullName + "$" // assume that java and scala encoding are same.
val moduleField =
try java.lang.Class.forName(className).getField("MODULE$") catch {
case ex: Exception =>
throw CompileTimeEvalException(s"Can't get ModuleField for lass $className", applyTerm.asExpr, ex)
}
val instance = moduleField.get(null)
if (instance eq null) throw CompileTimeEvalException(s"Module is null for lass $className", applyTerm.asExpr)
instance
// Field is a Scala field, we search for an access method with the same name
private def retrieveRuntimeField(obj: AnyRef, name: String): AnyRef =
try obj.getClass.getMethod(name).invoke(obj) catch { // TODO: error handling
case ex: NoSuchMethodException => obj.getClass.getField(name).get(obj)
}
private def applyJavaReflectedModuleField(applyTerm: Term, qualSym: Symbol, memberName: String,
args: List[Term]): Term =
jvmToTerm(applyTerm, javaReflectionCall(applyTerm, retrieveRuntimeModule(applyTerm, qualSym), memberName, args))
private def applyJavaReflectModule(applyTerm: Term, funSym: Symbol, args: List[Term]): Term =
applyJavaReflectedModuleField(applyTerm, funSym, "apply", args)
class JvmReflectionMethodCallException(msg: String, ex: Exception) extends RuntimeException(msg, ex)
sealed trait JvmReflectionMethodCall {
def process(): AnyRef
protected def retrieveArgTypes(args: Array[AnyRef]): Array[java.lang.Class[_]] =
val argsTypes = new Array[Class[_]](args.length)
var i = 0
while (i < argsTypes.length) {
argsTypes(i) = args(i).getClass()
i += 1
}
argsTypes
}
case class DirectJvmReflectionMethodCall(obj: AnyRef, name: String,
args: Array[AnyRef]) extends JvmReflectionMethodCall {
def process(): AnyRef =
val argsTypes = retrieveArgTypes(args)
val method =
try obj.getClass.getMethod(name, argsTypes: _*) catch {
case ex: NoSuchMethodException =>
throw JvmReflectionMethodCallException(s"Can't find method $name of object $obj (class ${obj.getClass}) with argument types: ${argsTypes.toList}", ex)
case ex: SecurityException =>
throw JvmReflectionMethodCallException(s"Can't get method $name of object $obj (class ${obj.getClass})", ex)
}
try method.invoke(obj, args: _*) catch {
case ex: Exception =>
throw JvmReflectionMethodCallException(s"Can't invoke method $name of object $obj (class ${obj.getClass})", ex)
}
}
sealed trait PrependedArgumentJvmReflectionMethodCall extends JvmReflectionMethodCall {
def prependArgument(obj: AnyRef, args: Array[AnyRef]): Array[AnyRef] =
val retval = new Array[AnyRef](args.length + 1)
retval(0) = obj
System.arraycopy(args, 0, retval, 1, args.length)
retval
}
case class HelperObjectJvmReflectionMethodCall(helperObj: AnyRef, obj: AnyRef, name: String,
args: Array[AnyRef]) extends PrependedArgumentJvmReflectionMethodCall {
def process(): AnyRef =
val nArgs = prependArgument(obj, args)
val argsTypes = retrieveArgTypes(nArgs)
val method =
try helperObj.getClass().getMethod(name, argsTypes: _*) catch {
case ex: NoSuchMethodException =>
throw JvmReflectionMethodCallException(s"Can't find method $name of object $helperObj (class ${helperObj.getClass}) with argument types: ${argsTypes.toList}", ex)
case ex: SecurityException =>
throw JvmReflectionMethodCallException(s"Can't get method $name of object $helperObj (class ${helperObj.getClass})", ex)
}
try method.invoke(helperObj, nArgs: _*) catch {
case ex: Exception =>
throw JvmReflectionMethodCallException(s"Can't invoke method $name of object $helperObj (class ${helperObj.getClass})", ex)
}
}
case class StringConcatJvmReflectionMethodCall(obj: String, args: Array[AnyRef]) extends JvmReflectionMethodCall {
def process(): AnyRef =
var r = obj
var i = 0
while (i < args.length) {
r = r.concat(args(i).toString)
i += 1
}
r
}
private def javaReflectionCall(term: Term, qual: AnyRef, name: String, args: List[Term]): AnyRef =
try prepareJvmReflectionMethodCall(term, qual, name, args.map(t => termToJvm(t)).toArray).process() catch {
case ex: JvmReflectionMethodCallException =>
throw CompileTimeEvalException(ex.getMessage, term.asExpr, ex.getCause)
}
private def prepareJvmReflectionMethodCall(t: Term, x: AnyRef, name: String,
args: Array[AnyRef]): JvmReflectionMethodCall = name match
case "+" =>
if (x.isInstanceOf[java.lang.String]) {
StringConcatJvmReflectionMethodCall(x.asInstanceOf[java.lang.String], args)
} else if (x.isInstanceOf[java.lang.Integer] || x.isInstanceOf[java.lang.Long]) {
HelperObjectJvmReflectionMethodCall(x, x, "sum", args)
} else {
throw CompileTimeEvalException(s"Can't find substitute for opeation $name of object $x (class ${x.getClass})", t.asExpr)
}
case _ => DirectJvmReflectionMethodCall(x, name, args)
private def jvmToTerm(applyTerm: Term, obj: AnyRef): Term = Literal {
if (obj.isInstanceOf[String]) StringConstant(obj.asInstanceOf[String])
else if (obj.asInstanceOf[java.lang.Boolean]) BooleanConstant(obj.asInstanceOf[java.lang.Boolean].booleanValue())
else if (obj.isInstanceOf[java.lang.Character]) CharConstant(obj.asInstanceOf[java.lang.Character].charValue())
else if (obj.isInstanceOf[java.lang.Byte]) ByteConstant(obj.asInstanceOf[java.lang.Byte].byteValue())
else if (obj.isInstanceOf[java.lang.Short]) ShortConstant(obj.asInstanceOf[java.lang.Short].shortValue())
else if (obj.isInstanceOf[java.lang.Integer]) IntConstant(obj.asInstanceOf[java.lang.Integer].intValue())
else if (obj.isInstanceOf[java.lang.Long]) LongConstant(obj.asInstanceOf[java.lang.Long].intValue())
else if (obj.isInstanceOf[java.lang.Float]) FloatConstant(obj.asInstanceOf[java.lang.Float].floatValue())
else if (obj.isInstanceOf[java.lang.Double]) DoubleConstant(obj.asInstanceOf[java.lang.Double].floatValue())
else {
throw CompileTimeEvalException(s"Return value of an external function ($obj) is not primitive or string", applyTerm.asExpr)
}
}
private def termToJvm(x: Term): AnyRef = x match
case Literal(StringConstant(v)) => v
case Literal(BooleanConstant(v)) => java.lang.Boolean.valueOf(v)
case Literal(CharConstant(v)) => java.lang.Character.valueOf(v)
case Literal(ByteConstant(v)) => java.lang.Byte.valueOf(v)
case Literal(ShortConstant(v)) => java.lang.Short.valueOf(v)
case Literal(IntConstant(v)) => java.lang.Integer.valueOf(v)
case Literal(LongConstant(v)) => java.lang.Long.valueOf(v)
case Literal(FloatConstant(v)) => java.lang.Float.valueOf(v)
case Literal(DoubleConstant(v)) => java.lang.Double.valueOf(v)
case id: Ident if (id.symbol.flags.is(Flags.Module)) => retrieveRuntimeModule(x, id.symbol)
case _ => throw CompileTimeEvalException(s"Can't interpret $x as primitive (type ${x.tpe.widen.show})", x.asExpr)
private def termToOptString(x: Term): Option[String] = x match
case Literal(NullConstant()) => None
case Literal(StringConstant(v)) => Some(v)
case _ => throw CompileTimeEvalException(s"Term should return string or null term, we have $x", x.asExpr)
private def termToString(x: quotes.reflect.Term): String = x match
case Literal(StringConstant(v)) => v
case _ => throw CompileTimeEvalException(s"Term should return string, we have $x", x.asExpr)
}
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