package scala.tools
package reflect
trait ToolBox[U <: scala.reflect.api.Universe] {
/** Underlying universe of a ToolBox
*/
val u: U
/** Underlying mirror of a ToolBox
*/
val mirror: u.Mirror
/** Front end of the toolbox.
*
* Accumulates and displays warnings and errors, can drop to interactive mode (if supported).
* The latter can be useful to study the typechecker or to debug complex macros.
*
* [[scala.tools.reflect]] provides two predefined front ends that can be created using
* [[scala.tools.reflect.mkSilentFrontEnd]] and [[scala.tools.reflect.mkConsoleFrontEnd]].
*/
def frontEnd: FrontEnd
/** Represents mode of operations of the typechecker underlying `c.typecheck` calls.
* Is necessary since the shape of the typechecked tree alone is not enough to guess how it should be typechecked.
* Can be EXPRmode (typecheck as a term), TYPEmode (typecheck as a type) or PATTERNmode (typecheck as a pattern).
*/
type TypecheckMode
/** Indicates that an argument to `c.typecheck` should be typechecked as a term.
* This is the default typechecking mode in Scala 2.11 and the only one supported in Scala 2.10.
*/
val TERMmode: TypecheckMode
/** Indicates that an argument to `c.typecheck` should be typechecked as a type.
*/
val TYPEmode: TypecheckMode
/** Indicates that an argument to `c.typecheck` should be typechecked as a pattern.
*/
val PATTERNmode: TypecheckMode
/** @see `Typers.typecheck`
*/
@deprecated("Use `tb.typecheck` instead", "2.11.0")
def typeCheck(tree: u.Tree, pt: u.Type = u.WildcardType, silent: Boolean = false, withImplicitViewsDisabled: Boolean = false, withMacrosDisabled: Boolean = false): u.Tree =
typecheck(tree, TERMmode, pt, silent, withImplicitViewsDisabled, withMacrosDisabled)
/** Typechecks a tree against the expected type `pt`
* under typechecking mode specified in `mode` with [[EXPRmode]] being default.
* This populates symbols and types of the tree and possibly transforms it to reflect certain desugarings.
*
* If the tree has unresolved type variables (represented as instances of `FreeTypeSymbol` symbols),
* then they all have to be resolved first using `Tree.substituteTypes`, or an error occurs.
*
* If `silent` is false, `ToolBoxError` will be thrown in case of a typecheck error.
* If `silent` is true, the typecheck is silent and will return `EmptyTree` if an error occurs.
* Such errors don't vanish and can be inspected by turning on -Ydebug.
*
* Typechecking can be steered with the following optional parameters:
* `withImplicitViewsDisabled` recursively prohibits implicit views (though, implicit vals will still be looked up and filled in), default value is false
* `withMacrosDisabled` recursively prohibits macro expansions and macro-based implicits, default value is false
*/
def typecheck(tree: u.Tree, mode: TypecheckMode = TERMmode, pt: u.Type = u.WildcardType, silent: Boolean = false, withImplicitViewsDisabled: Boolean = false, withMacrosDisabled: Boolean = false): u.Tree
/** Infers an implicit value of the expected type `pt` in top-level context.
* Optional `pos` parameter provides a position that will be associated with the implicit search.
*
* As mentioned in https://groups.google.com/forum/#!topic/scala-internals/ta-vbUT6JE8
* this API won't take into account the lexical context of the callsite, because
* currently it's impossible to reify it.
*
* If `silent` is false, `ToolBoxError` will be thrown in case of an inference error.
* If `silent` is true, the typecheck is silent and will return `EmptyTree` if an error occurs.
* Such errors don't vanish and can be inspected by turning on -Xlog-implicits.
* Unlike in `typecheck`, `silent` is true by default.
*/
def inferImplicitValue(pt: u.Type, silent: Boolean = true, withMacrosDisabled: Boolean = false, pos: u.Position = u.NoPosition): u.Tree
/** Infers an implicit view from the provided tree `tree` from the type `from` to the type `to` in the toplevel context.
* Optional `pos` parameter provides a position that will be associated with the implicit search.
*
* As mentioned in https://groups.google.com/forum/#!topic/scala-internals/ta-vbUT6JE8
* this API won't take into account the lexical context of the callsite, because
* currently it's impossible to reify it.
*
* If `silent` is false, `ToolBoxError` will be thrown in case of an inference error.
* If `silent` is true, the typecheck is silent and will return `EmptyTree` if an error occurs.
* Such errors don't vanish and can be inspected by turning on -Xlog-implicits.
* Unlike in `typecheck`, `silent` is true by default.
*/
def inferImplicitView(tree: u.Tree, from: u.Type, to: u.Type, silent: Boolean = true, withMacrosDisabled: Boolean = false, pos: u.Position = u.NoPosition): u.Tree
/** Recursively resets locally defined symbols and types in a given tree.
* WARNING: Don't use this API, go for [[untypecheck]] instead.
*/
@deprecated("Use `tb.untypecheck` instead", "2.11.0")
def resetLocalAttrs(tree: u.Tree): u.Tree
/**
* @see [[scala.reflect.macros.Typers.untypecheck]]
*/
def untypecheck(tree: u.Tree): u.Tree
/** .. */
def parse(code: String): u.Tree
/** Compiles a tree using this ToolBox.
*
* If the tree has unresolved type variables (represented as instances of `FreeTypeSymbol` symbols),
* then they all have to be resolved first using `Tree.substituteTypes`, or an error occurs.
*
* This spawns the compiler at the Namer phase, and pipelines the tree through that compiler.
* Currently `compile` does not accept trees that already typechecked, because typechecking isn't idempotent.
* For more info, take a look at https://issues.scala-lang.org/browse/SI-5464.
*/
def compile(tree: u.Tree): () => Any
/** Defines a top-level class, trait or module in this ToolBox,
* putting it into a uniquely-named package and returning a symbol that references the defined entity.
* For a ClassDef, a ClassSymbol is returned, and for a ModuleDef, a ModuleSymbol is returned (not a module class, but a module itself).
*
* This method can be used to generate definitions that will later be re-used by subsequent calls to
* `compile`, `define` or `eval`. To refer to the generated definition in a tree, use q"$sym".
*/
def define(tree: u.ImplDef): u.Symbol
/** Compiles and runs a tree using this ToolBox.
* Is equivalent to `compile(tree)()`.
*/
def eval(tree: u.Tree): Any
}
/** Represents an error during toolboxing
*/
case class ToolBoxError(message: String, cause: Throwable = null) extends Throwable(message, cause)
