Scala Compiler2.13.3 < Back
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# Packages

-  package root

  The Scala compiler and reflection APIs.

  The Scala compiler and reflection APIs.

  Definition Classes
    root
-  package scala
  Definition Classes
    root
-  package tools
  Definition Classes
    scala
-  package nsc
  Definition Classes
    tools
-  package ast
  Definition Classes
    nsc
-  package parser
  Definition Classes
    ast
-  trait Scanners extends ScannersCommon
  Definition Classes
    parser
- CommonTokenData
- DocScanner
- MalformedInput
- ParensAnalyzer
- Scanner
- ScannerCommon
- ScannerData
- SourceFileScanner
- TokenData
- UnitScanner

c

scala.tools.nsc.ast.parser.Scanners

# Scanner

###

#### abstract class Scanner extends CharArrayReader with TokenData with ScannerData with ScannerCommon with DocScanner

Source
  Scanners.scala

Linear Supertypes
Scanners.DocScanner, Scanners.ScannerCommon, ScannerData, TokenData, Scanners.CommonTokenData, CharArrayReader, CharArrayReaderData, AnyRef, Any
Known Subclasses
ParensAnalyzer, SourceFileScanner, UnitScanner, ScaladocUnitScanner
Type Hierarchy

Ordering

1. Alphabetic
2. By Inheritance

Inherited

1. Scanner
2. DocScanner
3. ScannerCommon
4. ScannerData
5. TokenData
6. CommonTokenData
7. CharArrayReader
8. CharArrayReaderData
9. AnyRef
10. Any

Implicitly

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

1. Hide All
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Visibility

1. Public
2. Protected

### Instance Constructors

1.  new Scanner()

### Type Members

1.  class CharArrayLookaheadReader extends CharArrayReader
   Definition Classes
     CharArrayReader

### Abstract Value Members

1.  abstract val buf: Array[Char]
   Definition Classes
     CharArrayReader
2.  abstract def deprecationWarning(off: Scanners.Offset, msg: String, since: String): Unit
   Definition Classes
     ScannerCommon
3.  abstract def error(off: Scanners.Offset, msg: String): Unit
   Definition Classes
     ScannerCommon
4.  abstract def incompleteInputError(off: Scanners.Offset, msg: String): Unit
   Definition Classes
     ScannerCommon
5.  abstract def warning(off: Scanners.Offset, msg: String, category: WarningCategory): Unit
   Definition Classes
     ScannerCommon

### 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 Scanner toany2stringadd[Scanner] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd
4.  def ->[B](y: B): (Scanner, B)
   Implicit
     This member is added by an implicit conversion from Scanner toArrowAssoc[Scanner] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()
5.  final def ==(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
6.  def adjustSepRegions(lastToken: Scanners.Token): Unit
7.  def applyBracePatch(): Boolean

   overridden in UnitScanners: apply brace patch if one exists for this offset return true if subsequent end of line handling should be suppressed.

8.  final def asInstanceOf[T0]: T0
   Definition Classes
     Any
9.  val base: Int

   the base of a number

   the base of a number

   Definition Classes
     TokenData
10.  def beginDocComment(prefix: String): Unit
    Attributes
      protected
    Definition Classes
      DocScanner
11.  val cbuf: java.lang.StringBuilder

    A character buffer for literals

12.  val ch: Char

    the last read character

    the last read character

    Definition Classes
      CharArrayReaderData
13.  def charLitOr(op: () => Unit): Unit

    Parse character literal if current character is followed by \', or follow with given op and return a symbol literal token

14.  val charOffset: Int

    The offset one past the last read character

    The offset one past the last read character

    Definition Classes
      CharArrayReaderData
15.  def charVal: Char

    Convert current strVal to char value.

16.  def checkNoLetter(): Unit
    Annotations
      @inline()
17.  def checkNoTrailingSeparator(): Unit
18.  def clone(): AnyRef
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.CloneNotSupportedException]) @native()
19.  def copyFrom(sd: ScannerData): Scanner.this.type
    Definition Classes
      ScannerData
20.  def copyFrom(td: TokenData): Scanner.this.type
    Definition Classes
      TokenData
21.  def copyFrom(cd: CharArrayReaderData): Scanner.this.type
    Definition Classes
      CharArrayReaderData
22.  def deprecationWarning(msg: String, since: String): Unit
23.  def discardDocBuffer(): Unit

    To prevent doc comments attached to expressions from leaking out of scope onto the next documentable entity, they are discarded upon passing a right brace, bracket, or parenthesis.

    To prevent doc comments attached to expressions from leaking out of scope onto the next documentable entity, they are discarded upon passing a right brace, bracket, or parenthesis.

    Definition Classes
      DocScanner
24.  def doubleVal: Double
    Annotations
      @inline()
25.  def doubleVal(negated: Boolean): Double

    Convert current strVal, base to double value.

26.  def emitIdentifierDeprecationWarnings: Boolean

    Determines whether this scanner should emit identifier deprecation warnings, e.g.

    Determines whether this scanner should emit identifier deprecation warnings, e.g. when seeing `macro` or `then`, which are planned to become keywords in future versions of Scala.

    Attributes
      protected
27.  def ensuring(cond: (Scanner) => Boolean, msg: => Any): Scanner
    Implicit
      This member is added by an implicit conversion from Scanner toEnsuring[Scanner] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
28.  def ensuring(cond: (Scanner) => Boolean): Scanner
    Implicit
      This member is added by an implicit conversion from Scanner toEnsuring[Scanner] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
29.  def ensuring(cond: Boolean, msg: => Any): Scanner
    Implicit
      This member is added by an implicit conversion from Scanner toEnsuring[Scanner] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
30.  def ensuring(cond: Boolean): Scanner
    Implicit
      This member is added by an implicit conversion from Scanner toEnsuring[Scanner] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
31.  final def eq(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
32.  def equals(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef → Any
33.  final def fetchToken(): Unit

    read next token, filling TokenData fields of Scanner.

    read next token, filling TokenData fields of Scanner.

    Attributes
      protected
    Annotations
      @tailrec()
34.  def finalize(): Unit
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.Throwable])
35.  def finishDocComment(): Unit
    Attributes
      protected
    Definition Classes
      DocScanner
36.  def floatVal: Float
    Annotations
      @inline()
37.  def floatVal(negated: Boolean): Float

    Convert current strVal, base to float value.

38.  def flushDoc(): Global.DocComment
    Definition Classes
      DocScanner
39.  def formatted(fmtstr: String): String
    Implicit
      This member is added by an implicit conversion from Scanner toStringFormat[Scanner] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()
40.  final def getClass(): Class[_ <: AnyRef]
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
41.  def getFraction(): Unit

    read fractional part and exponent of floating point number if one is present.

    read fractional part and exponent of floating point number if one is present.

    Attributes
      protected
42.  def getLitChar(): Unit

    copy current character into cbuf, interpreting any escape sequences, and advance to next character.

    copy current character into cbuf, interpreting any escape sequences, and advance to next character.

    Attributes
      protected
43.  def getNumber(): Unit

    Read a number into strVal.

    Read a number into strVal.

    The `base` can be 2, 10 or 16.

    Attributes
      protected
44.  def hashCode(): Int
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
45.  def healBraces(): List[BracePatch]

    overridden in UnitScanners

46.  def inFirstOfStat(token: Scanners.Token): Boolean

    Can token start a statement?

47.  def inLastOfStat(token: Scanners.Token): Boolean

    Can token end a statement?

48.  def incompleteInputError(msg: String): Unit

    signal an error where the input ended in the middle of a token

49.  def init(): Unit

    Initialization method: read first char, then first token

50.  def intVal: Long
    Annotations
      @inline()
51.  def intVal(negated: Boolean): Long

    Convert current strVal, base to long value.

    Convert current strVal, base to long value. This is tricky because of max negative value.

    Conversions in base 2, 10 and 16 are supported. Number separators are skipped on the fly.

52.  def invalidEscape(): Unit
    Attributes
      protected
53.  def invalidUnicodeEscape(n: Int): Unit
    Attributes
      protected
54.  def isAtEnd: Boolean
55.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
56.  def isTrailingComma(right: Scanners.Token): Boolean
57.  val lastLineStartOffset: Int

    The start offset of the line before the current one

    The start offset of the line before the current one

    Definition Classes
      CharArrayReaderData
58.  val lastOffset: Scanners.Offset

    the offset of the character following the token preceding this one

    the offset of the character following the token preceding this one

    Definition Classes
      TokenData
59.  val lineStartOffset: Int

    The start offset of the current line

    The start offset of the current line

    Definition Classes
      CharArrayReaderData
60.  def lookaheadReader: CharArrayLookaheadReader

    A new reader that takes off at the current character position

    A new reader that takes off at the current character position

    Definition Classes
      CharArrayReader
61.  def lookingAhead[A](body: => A): A
62.  val name: Global.TermName

    the name of an identifier

    the name of an identifier

    Definition Classes
      TokenData → CommonTokenData
63.  final def ne(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
64.  val next: TokenData

    we need one token lookahead and one token history

    we need one token lookahead and one token history

    Definition Classes
      ScannerData
65.  final def nextChar(): Unit

    Advance one character; reducing CR;LF pairs to just LF

    Advance one character; reducing CR;LF pairs to just LF

    Definition Classes
      CharArrayReader
66.  final def nextRawChar(): Unit

    Advance one character, leaving CR;LF pairs intact.

    Advance one character, leaving CR;LF pairs intact. This is for use in multi-line strings, so there are no "potential line ends" here.

    Definition Classes
      CharArrayReader
67.  def nextToken(): Unit

    Produce next token, filling TokenData fields of Scanner.

    Produce next token, filling TokenData fields of Scanner.

    Definition Classes
      Scanner → ScannerCommon
68.  def nextTokenAllow(name: Global.Name): Unit

    Get next token, and allow the otherwise deprecated ident `name`

69.  final def notify(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
70.  final def notifyAll(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
71.  val offset: Scanners.Offset

    the offset of the first character of the current token

    the offset of the first character of the current token

    Definition Classes
      TokenData
72.  def parenBalance(token: Scanners.Token): Int

    overridden in UnitScanners

73.  def postProcessToken(): Unit
74.  val prev: TokenData
    Definition Classes
      ScannerData
75.  def processCommentChar(): Unit
    Attributes
      protected
    Definition Classes
      DocScanner
76.  def putChar(c: Char): Unit

    append Unicode character to "cbuf" buffer

    append Unicode character to "cbuf" buffer

    Attributes
      protected
77.  final def putCommentChar(): Unit
    Attributes
      protected
78.  def registerDocComment(raw: String, pos: Global.Position): Unit
    Definition Classes
      DocScanner
79.  def resume(lastCode: Scanners.Token): Unit
80.  var sepRegions: List[Scanners.Token]

    a stack of tokens which indicates whether line-ends can be statement separators also used for keeping track of nesting levels.

    a stack of tokens which indicates whether line-ends can be statement separators also used for keeping track of nesting levels. We keep track of the closing symbol of a region. This can be RPAREN if region starts with '(' RBRACKET if region starts with '[' RBRACE if region starts with '{' ARROW if region starts with 'case' STRINGLIT if region is a string interpolation expression starting with '${' (the STRINGLIT appears twice in succession on the stack iff the expression is a multiline string literal).

81.  final def skipComment(): Boolean

    Returns true if a comment was skipped.

    Returns true if a comment was skipped.

    Note

      Pre-condition: ch == '/'

82.  final def skipNestedComments(): Unit
    Annotations
      @tailrec()
83.  def skipToken(): Scanners.Offset

    read next token and return last offset

84.  def skipTrailingComma(right: Scanners.Token): Boolean
    Definition Classes
      Scanner → ScannerCommon
85.  val strVal: String

    the string value of a literal

    the string value of a literal

    Definition Classes
      TokenData
86.  final def synchronized[T0](arg0: => T0): T0
    Definition Classes
      AnyRef
87.  def syntaxError(msg: String): Unit

    generate an error at the current token offset

88.  def syntaxError(off: Scanners.Offset, msg: String): Unit

    generate an error at the given offset

89.  def toString(): String
    Definition Classes
      Scanner → AnyRef → Any
90.  val token: Scanners.Token

    the next token

    the next token

    Definition Classes
      TokenData → CommonTokenData
91.  final def wait(): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException])
92.  final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException])
93.  final def wait(arg0: Long): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException]) @native()

### Deprecated Value Members

1.  def →[B](y: B): (Scanner, B)
   Implicit
     This member is added by an implicit conversion from Scanner toArrowAssoc[Scanner] 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 Scanners.DocScanner

### Inherited from Scanners.ScannerCommon

### Inherited from ScannerData

### Inherited from TokenData

### Inherited from Scanners.CommonTokenData

### Inherited from CharArrayReader

### Inherited from CharArrayReaderData

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd fromScanner to any2stringadd[Scanner]

### Inherited by implicit conversion StringFormat fromScanner to StringFormat[Scanner]

### Inherited by implicit conversion Ensuring fromScanner to Ensuring[Scanner]

### Inherited by implicit conversion ArrowAssoc fromScanner to ArrowAssoc[Scanner]

### Ungrouped