class Lexer extends AnyRef
A simple lexer for tokens as they are used in JSON, plus parens (, )
Tokens understood are:
(, ), [, ], {, }, :, ,, true, false, null,
strings (syntax as in JSON),
integer numbers (syntax as in JSON: -?(0|\d+)
floating point numbers (syntax as in JSON: -?(0|\d+)(\.\d+)?((e|E)(+|-)?\d+)?)
The end of input is represented as its own token, EOF.
Lexers can keep one token lookahead
- Source
- Lexer.scala
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- Lexer
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Value Members
- final def !=(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
- final def ##: Int
- Definition Classes
- AnyRef → Any
- def +(other: String): String
- def ->[B](y: B): (Lexer, B)
- final def ==(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
- def accept(ch: Char): Unit
The current token is a delimiter consisting of given character, reads next token, otherwise raises an error.
The current token is a delimiter consisting of given character, reads next token, otherwise raises an error.
- ch
the given delimiter character to compare current token with
- Exceptions thrown
Lexer.MalformedInputif the current tokentokenis not a delimiter, or consists of a character different fromc.
- def accept(t: Token): Unit
If current token equals given token, reads next token, otherwise raises an error.
If current token equals given token, reads next token, otherwise raises an error.
- t
the given token to compare current token with
- Exceptions thrown
Lexer.MalformedInputif the two tokens do not match.
- def acceptChar(c: Char): Unit
If last-read character equals given character, reads next character, otherwise raises an error
If last-read character equals given character, reads next character, otherwise raises an error
- c
the given character to compare with last-read character
- Exceptions thrown
Lexer.MalformedInputif character does not match
- final def asInstanceOf[T0]: T0
- Definition Classes
- Any
- var ch: Char
The last-read character
- def clone(): AnyRef
- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.CloneNotSupportedException]) @native()
- def ensuring(cond: (Lexer) => Boolean, msg: => Any): Lexer
- def ensuring(cond: (Lexer) => Boolean): Lexer
- def ensuring(cond: Boolean, msg: => Any): Lexer
- def ensuring(cond: Boolean): Lexer
- final def eq(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
- def equals(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef → Any
- def error(msg: String): Nothing
Always throws a Lexer.MalformedInput exception with given error message.
Always throws a Lexer.MalformedInput exception with given error message.
- msg
the error message
- def finalize(): Unit
- Attributes
- protected[lang]
- Definition Classes
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- Annotations
- @throws(classOf[java.lang.Throwable])
- final def getClass(): Class[_ <: AnyRef]
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
- def getNumber(): Unit
Reads a numeric literal, and forms an
IntLitorFloatLittoken from it.Reads a numeric literal, and forms an
IntLitorFloatLittoken from it. Last-read input characterchmust be either-or a digit.- Exceptions thrown
Lexer.MalformedInputif lexeme not recognized as a numeric literal.
- def getString(): Unit
Reads a string literal, and forms a
StringLittoken from it.Reads a string literal, and forms a
StringLittoken from it. Last-read input characterchmust be opening"-quote.- Exceptions thrown
Lexer.MalformedInputif lexeme not recognized as a string literal.
- def hashCode(): Int
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
- final def isInstanceOf[T0]: Boolean
- Definition Classes
- Any
- final def ne(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
- def nextChar(): Unit
Reads next character into
ch - def nextToken(): Unit
Skips whitespace and reads next lexeme into
tokenSkips whitespace and reads next lexeme into
token- Exceptions thrown
Lexer.MalformedInputif lexeme not recognized as a valid token
- final def notify(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
- final def notifyAll(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
- var pos: Long
The number of characters read so far
- final def synchronized[T0](arg0: => T0): T0
- Definition Classes
- AnyRef
- def toString(): String
- Definition Classes
- AnyRef → Any
- var token: Token
The last-read token
- var tokenPos: Long
The number of characters read before the start of the last-read token
- final def wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
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- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long): Unit
- Definition Classes
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- @throws(classOf[java.lang.InterruptedException]) @native()
Deprecated Value Members
- def formatted(fmtstr: String): String
- Implicit
- This member is added by an implicit conversion from Lexer toStringFormat[Lexer] performed by method StringFormat in scala.Predef.
- Definition Classes
- StringFormat
- Annotations
- @deprecated @inline()
- Deprecated
(Since version 2.12.16) Use
formatString.format(value)instead ofvalue.formatted(formatString), or use thef""string interpolator. In Java 15 and later,formattedresolves to the new method in String which has reversed parameters.
- def →[B](y: B): (Lexer, B)
- Implicit
- This member is added by an implicit conversion from Lexer toArrowAssoc[Lexer] 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.
The Scala compiler and reflection APIs.