Scala Reflection Library2.13.5 < Back
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  EXPERIMENTAL

  EXPERIMENTAL

  The Scala Reflection API (located in scala-reflect.jar).

  In Scala 2.10.0, the Scala Reflection API and its implementation have an "experimental" status. This means that the API and the docs are not complete and can be changed in binary- and source-incompatible manner in 2.10.1. This also means that the implementation has some known issues.

  The following types are the backbone of the Scala Reflection API, and serve as a good starting point for information about Scala Reflection:

  - scala.reflect.api.Symbols
  - scala.reflect.api.Types
  - scala.reflect.api.Mirrors
  - scala.reflect.api.Universe

  For more information about Scala Reflection, see the Reflection Guide

  Definition Classes
    reflect
- Annotations
- Constants
- Exprs
- FlagSets
- ImplicitTags
- Internals
- JavaUniverse
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- Mirrors
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- Position
- Positions
- Printers
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- StandardDefinitions
- StandardLiftables
- StandardNames
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- TreeCreator
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- TypeCreator
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- Types
- Universe

t

scala.reflect.api

# Position

###

#### trait Position extends Attachments

EXPERIMENTAL

Position tracks the origin of symbols and tree nodes. They are commonly used when displaying warnings and errors, to indicate the incorrect point in the program.

Every non-empty position refers to a SourceFile and three character offsets within it: start, end, and point. The point is where the ^ belongs when issuing an error message, usually a Name. A range position can be designated as transparent, which excuses it from maintaining the invariants to follow. If a transparent position has opaque children, those are considered as if they were the direct children of the transparent position's parent.

Note: some of these invariants actually apply to the trees which carry the positions, but they are phrased as if the positions themselves were the parent/children for conciseness.

Invariant 1: in a focused/offset position, start == point == end Invariant 2: in a range position, start <= point < end Invariant 3: an offset position never has a child with a range position Invariant 4: every range position child of a range position parent is contained within its parent Invariant 5: opaque range position siblings overlap at most at a single point

The following tests are useful on positions:

pos.isDefined true if position is not an UndefinedPosition (those being NoPosition and FakePos) pos.isRange true if position is a range (opaque or transparent) which implies start < end pos.isOpaqueRange true if position is an opaque range

The following accessor methods are provided - an exception will be thrown if point/start/end are attempted on an UndefinedPosition.

pos.source The source file of the position, or NoSourceFile if unavailable pos.point The offset of the point pos.start The (inclusive) start offset, or the point of an offset position pos.end The (exclusive) end offset, or the point of an offset position

The following conversion methods are often used:

pos.focus Converts a range position to an offset position focused on the point pos.makeTransparent Convert an opaque range into a transparent range

For more information about `Position`s, see the Reflection Guide: Annotations, Names, Scopes, and More

Source
  Position.scala

Linear Supertypes
Attachments, AnyRef, Any
Type Hierarchy
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3. By Inheritance

Inherited

1. Position
2. Attachments
3. AnyRef
4. Any

Implicitly

1. by any2stringadd
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc

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Visibility

1. Public
2. Protected

### Type Members

1.  abstract type Pos >: Null <: Position

   The position type of this attachment

   The position type of this attachment

   Definition Classes
     Position → Attachments

### Abstract Value Members

1.  abstract def all: Set[Any]

   The underlying payload with the guarantee that no two elements have the same type.

   The underlying payload with the guarantee that no two elements have the same type.

   Definition Classes
     Attachments
2.  abstract def column: Int

   The position indicates a `column` and the `line` in the source file.

3.  abstract def end: Int

   The end of the position's range, or the point if not a range position.

4.  abstract def focus: Pos

   If this is a range position, the offset position of its point.

   If this is a range position, the offset position of its point. Otherwise the position itself

5.  abstract def isEmpty: Boolean
   Definition Classes
     Attachments
6.  abstract def isOpaqueRange: Boolean

   Is this position a non-transparent range position?

7.  abstract def isRange: Boolean

   Is this position a range position?

8.  abstract def isTransparent: Boolean

   Is this position a transparent position?

9.  abstract def line: Int

   The position indicates a `column` and the `line` in the source file.

10.  abstract def makeTransparent: Pos

    If opaque range, make this position transparent.

11.  abstract def point: Int

    The point (where the ^ is) of the position, which is easiest to access using the line and column values. The line content is also available.

12.  abstract def pos: Pos

    The underlying position

    The underlying position

    Definition Classes
      Attachments
13.  abstract def source: SourceFile

    Java file corresponding to the source file of this position.

    Java file corresponding to the source file of this position.

    The return type is `scala.reflect.io.AbstractFile`, which belongs to an experimental part of Scala reflection. It should not be used unless you know what you are doing. In subsequent releases, this API will be refined and exposed as a part of scala.reflect.api.

14.  abstract def start: Int

    The start of the position's range, or the point if not a range position.

15.  abstract def withEnd(off: Int): Pos

    Returns a new position with the same attributes, but a different end value (if a range).

16.  abstract def withPoint(off: Int): Pos

    Returns a new position with the same attributes, but a different point value (if a range or offset).

17.  abstract def withPos(newPos: Pos): Attachments { type Pos = Position.this.Pos }

    Creates a copy of this attachment with the position replaced by `newPos`

    Creates a copy of this attachment with the position replaced by `newPos`

    Definition Classes
      Attachments
18.  abstract def withStart(off: Int): Pos

    Returns a new position with the same attributes, but a different start value (if a range).

19.  abstract def endOrPoint: Int

    The end of the position's range, or point if not a range position.

    The end of the position's range, or point if not a range position.

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

20.  abstract def focusEnd: Pos

    If this is a range position, the offset position of its end.

    If this is a range position, the offset position of its end. Otherwise the position itself

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

21.  abstract def focusStart: Pos

    If this is a range position, the offset position of its start.

    If this is a range position, the offset position of its start. Otherwise the position itself

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

22.  abstract def includes(pos: Pos): Boolean

    Does this position include the given position `pos`? This holds if `this` is a range position and its range [start..end] is the same or covers the range of the given position, which may or may not be a range position.

    Does this position include the given position `pos`? This holds if `this` is a range position and its range [start..end] is the same or covers the range of the given position, which may or may not be a range position.

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

23.  abstract def isDefined: Boolean

    Is this position not a NoPosition? If isDefined is true, offset and source are both defined.

    Is this position not a NoPosition? If isDefined is true, offset and source are both defined.

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

24.  abstract def lineContent: String

    The content of the line this Position refers to.

    The content of the line this Position refers to.

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

25.  abstract def overlaps(pos: Pos): Boolean

    Does this position overlap with that position? This holds if both positions are ranges and there is an interval of non-zero length that is shared by both position ranges.

    Does this position overlap with that position? This holds if both positions are ranges and there is an interval of non-zero length that is shared by both position ranges.

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

26.  abstract def pointOrElse(default: Int): Int

    The point (where the ^ is) of the position, or else `default` if undefined.

    The point (where the ^ is) of the position, or else `default` if undefined.

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

27.  abstract def precedes(pos: Pos): Boolean

    Does this position precede that position? This holds if both positions are defined and the end point of this position is not larger than the start point of the given position.

    Does this position precede that position? This holds if both positions are defined and the end point of this position is not larger than the start point of the given position.

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

28.  abstract def properlyIncludes(pos: Pos): Boolean

    Does this position properly include the given position `pos` ("properly" meaning their ranges are not the same)?

    Does this position properly include the given position `pos` ("properly" meaning their ranges are not the same)?

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

29.  abstract def properlyPrecedes(pos: Pos): Boolean

    Does this position properly precede the given position `pos` ("properly" meaning their ranges do not share a common point).

    Does this position properly precede the given position `pos` ("properly" meaning their ranges do not share a common point).

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

30.  abstract def sameRange(pos: Pos): Boolean

    Does this position cover the same range as that position? Holds only if both position are ranges

    Does this position cover the same range as that position? Holds only if both position are ranges

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

31.  abstract def show: String

    Show a textual representation of the position.

    Show a textual representation of the position.

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) use `universe.show(position)` instead

32.  abstract def startOrPoint: Int

    The start of the position's range, or point if not a range position.

    The start of the position's range, or point if not a range position.

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

33.  abstract def toSingleLine: Pos

    Convert this to a position around `point` that spans a single source line

    Convert this to a position around `point` that spans a single source line

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

34.  abstract def union(pos: Pos): Pos

    If this is a range, the union with the other range, with the point of this position.

    If this is a range, the union with the other range, with the point of this position. Otherwise, this position

    Annotations
      @deprecated
    Deprecated

      (Since version 2.11.0) removed from the public API

### Concrete Value Members

1.  final def !=(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
2.  final def ##: Int
   Definition Classes
     AnyRef → Any
3.  def +(other: String): String
   Implicit
     This member is added by an implicit conversion from Position toany2stringadd[Position] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd
4.  def ->[B](y: B): (Position, B)
   Implicit
     This member is added by an implicit conversion from Position toArrowAssoc[Position] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()
5.  final def ==(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
6.  final def addElement[T](attachment: T): Attachments { type Pos = Position.this.Pos }

   Creates a copy of this attachment with the given element added.

   Creates a copy of this attachment with the given element added.

   Definition Classes
     Attachments
7.  final def asInstanceOf[T0]: T0
   Definition Classes
     Any
8.  def clone(): AnyRef
   Attributes
     protected[lang]
   Definition Classes
     AnyRef
   Annotations
     @throws(classOf[java.lang.CloneNotSupportedException]) @native()
9.  def cloneAttachments: Attachments { type Pos = Position.this.Pos }
   Definition Classes
     Attachments
10.  def contains[T](implicit arg0: ClassTag[T]): Boolean

    Check underlying payload contains an instance of type `T`.

    Check underlying payload contains an instance of type `T`.

    Definition Classes
      Attachments
11.  final def containsElement(element: Any): Boolean

    Tests if the given element is attached.

    Tests if the given element is attached.

    Definition Classes
      Attachments
12.  def ensuring(cond: (Position) => Boolean, msg: => Any): Position
    Implicit
      This member is added by an implicit conversion from Position toEnsuring[Position] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
13.  def ensuring(cond: (Position) => Boolean): Position
    Implicit
      This member is added by an implicit conversion from Position toEnsuring[Position] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
14.  def ensuring(cond: Boolean, msg: => Any): Position
    Implicit
      This member is added by an implicit conversion from Position toEnsuring[Position] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
15.  def ensuring(cond: Boolean): Position
    Implicit
      This member is added by an implicit conversion from Position toEnsuring[Position] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
16.  final def eq(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
17.  def equals(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef → Any
18.  def finalize(): Unit
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.Throwable])
19.  def formatted(fmtstr: String): String
    Implicit
      This member is added by an implicit conversion from Position toStringFormat[Position] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()
20.  def get[T](implicit arg0: ClassTag[T]): Option[T]

    An underlying payload of the given class type `T`.

    An underlying payload of the given class type `T`.

    Definition Classes
      Attachments
21.  final def getClass(): Class[_ <: AnyRef]
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
22.  def hashCode(): Int
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
23.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
24.  final def ne(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
25.  final def notify(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
26.  final def notifyAll(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
27.  def remove[T](implicit arg0: ClassTag[T]): Attachments { type Pos = Position.this.Pos }

    Creates a copy of this attachment with the payload of the given class type `T` removed.

    Creates a copy of this attachment with the payload of the given class type `T` removed.

    Definition Classes
      Attachments
28.  final def removeElement[T](attachment: T): Attachments { type Pos = Position.this.Pos }

    Creates a copy of this attachment with the given element removed.

    Creates a copy of this attachment with the given element removed.

    Definition Classes
      Attachments
29.  final def synchronized[T0](arg0: => T0): T0
    Definition Classes
      AnyRef
30.  def toString(): String
    Definition Classes
      AnyRef → Any
31.  def update[T](attachment: T)(implicit arg0: ClassTag[T]): Attachments { type Pos = Position.this.Pos }

    Creates a copy of this attachment with the payload slot of T added/updated with the provided value.

    Creates a copy of this attachment with the payload slot of T added/updated with the provided value. Replaces an existing payload of the same type, if exists.

    Definition Classes
      Attachments
32.  final def wait(): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException])
33.  final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException])
34.  final def wait(arg0: Long): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException]) @native()

### Deprecated Value Members

1.  def →[B](y: B): (Position, B)
   Implicit
     This member is added by an implicit conversion from Position toArrowAssoc[Position] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @deprecated
   Deprecated

     (Since version 2.13.0) Use `->` instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

### Inherited from Attachments

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd fromPosition to any2stringadd[Position]

### Inherited by implicit conversion StringFormat fromPosition to StringFormat[Position]

### Inherited by implicit conversion Ensuring fromPosition to Ensuring[Position]

### Inherited by implicit conversion ArrowAssoc fromPosition to ArrowAssoc[Position]

### Commonly used methods

### Ungrouped