Scala Compiler2.12.21 < 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
 
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

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Visibility

1. Public
2. All

### 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 to any2stringadd[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 to ArrowAssoc[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 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.

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

   the base of a number

   the base of a number

   Definition Classes
     TokenData
9.  def beginDocComment(prefix: String): Unit
   Attributes
     protected
   Definition Classes
     DocScanner
10.  val bidiChars: ListBuffer[(Int, Int)]
    Definition Classes
      CharArrayReader
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
17.  def clone(): AnyRef
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( ... ) @native()
18.  def copyFrom(sd: ScannerData): Scanner.this.type
    Definition Classes
      ScannerData
19.  def copyFrom(td: TokenData): Scanner.this.type
    Definition Classes
      TokenData
20.  def copyFrom(cd: CharArrayReaderData): Scanner.this.type
    Definition Classes
      CharArrayReaderData
21.  def decodeUni: Boolean
    Definition Classes
      CharArrayReader
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
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 to Ensuring[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 to Ensuring[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 to Ensuring[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 to Ensuring[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: Any): 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
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
37.  def floatVal(negated: Boolean): Float

    Convert current strVal, base to float value.

38.  def flushDoc(): Global.DocComment
    Definition Classes
      DocScanner
39.  final def getClass(): Class[_]
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
40.  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
41.  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
42.  def getNumber(): Unit

    Read a number into strVal.

    Read a number into strVal.

    The `base` can be 8, 10 or 16, where base 8 flags a leading zero. For ints, base 8 is legal only for the case of exactly one zero.

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

    overridden in UnitScanners

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

    Can token start a statement?

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

    Can token end a statement?

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

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

48.  def init(): Unit

    Initialization method: read first char, then first token

49.  def intVal: Long
50.  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 10 and 16 are supported. As a permanent migration path, attempts to write base 8 literals except `0` emit a verbose error.

51.  def invalidEscape(): Unit
    Attributes
      protected
52.  def isAtEnd: Boolean
53.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
54.  def isUnicodeEscape: Boolean

    Is last character a unicode escape \\uxxxx?

    Is last character a unicode escape \\uxxxx?

    Definition Classes
      CharArrayReader
55.  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
56.  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
57.  val lastUnicodeOffset: Int
    Attributes
      protected
    Definition Classes
      CharArrayReaderData
58.  val lineStartOffset: Int

    The start offset of the current line

    The start offset of the current line

    Definition Classes
      CharArrayReaderData
59.  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
60.  val name: Global.TermName

    the name of an identifier

    the name of an identifier

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

    we need one token lookahead and one token history

    we need one token lookahead and one token history

    Definition Classes
      ScannerData
63.  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
64.  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
65.  def nextToken(): Unit

    Produce next token, filling TokenData fields of Scanner.

    Produce next token, filling TokenData fields of Scanner.

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

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

67.  final def notify(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
68.  final def notifyAll(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
69.  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
70.  def parenBalance(token: Scanners.Token): Int

    overridden in UnitScanners

71.  val prev: TokenData
    Definition Classes
      ScannerData
72.  def processCommentChar(): Unit
    Attributes
      protected
    Definition Classes
      DocScanner
73.  def putChar(c: Char): Unit

    append Unicode character to "cbuf" buffer

    append Unicode character to "cbuf" buffer

    Attributes
      protected
74.  final def putCommentChar(): Unit
    Attributes
      protected
75.  def registerDocComment(raw: String, pos: Global.Position): Unit
    Definition Classes
      DocScanner
76.  def resume(lastCode: Scanners.Token): Unit
77.  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).

78.  def skipCASE(): Unit

    Advance beyond a case token without marking the CASE in sepRegions.

    Advance beyond a case token without marking the CASE in sepRegions. This method should be called to skip beyond CASE tokens that are not part of matches, i.e. no ARROW is expected after them.

79.  final def skipComment(): Boolean

80.  final def skipNestedComments(): Unit
    Annotations
      @tailrec()
81.  def skipToken(): Scanners.Offset

    read next token and return last offset

82.  val strVal: String

    the string value of a literal

    the string value of a literal

    Definition Classes
      TokenData
83.  final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
      AnyRef
84.  def syntaxError(msg: String): Unit

    generate an error at the current token offset

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

    generate an error at the given offset

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

    the next token

    the next token

    Definition Classes
      TokenData → CommonTokenData
88.  final def wait(): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
89.  final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
90.  final def wait(arg0: Long): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... ) @native()
91.  def →[B](y: B): (Scanner, B)
    Implicit
      This member is added by an implicit conversion from Scanner to ArrowAssoc[Scanner] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc

### Deprecated Value Members

1.  def formatted(fmtstr: String): String
   Implicit
     This member is added by an implicit conversion from Scanner to StringFormat[Scanner] performed by method StringFormat in scala.Predef.
   Definition Classes
     StringFormat
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.12.16) Use `formatString.format(value)` instead of `value.formatted(formatString)`, or use the `f""` string interpolator. In Java 15 and later, `formatted` resolves to the new method in String which has reversed parameters.

### 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 from Scanner to any2stringadd[Scanner]

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

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

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

### Ungrouped