Packages

  • package root

    This is the documentation for Parsley.

    This is the documentation for Parsley.

    Package structure

    The parsley package contains the Parsley class, as well as the Result, Success, and Failure types. In addition to these, it also contains the following packages and "modules" (a module is defined as being an object which mocks a package):

    • parsley.Parsley contains the bulk of the core "function-style" combinators.
    • parsley.combinator contains many helpful combinators that simplify some common parser patterns.
    • parsley.character contains the combinators needed to read characters and strings, as well as combinators to match specific sub-sets of characters.
    • parsley.debug contains debugging combinators, helpful for identifying faults in parsers.
    • parsley.extension contains syntactic sugar combinators exposed as implicit classes.
    • parsley.io contains extension methods to run parsers with input sourced from IO sources.
    • parsley.expr contains the following sub modules:
      • parsley.expr.chain contains combinators used in expression parsing
      • parsley.expr.precedence is a builder for expression parsers built on a precedence table.
      • parsley.expr.infix contains combinators used in expression parsing, but with more permissive types than their equivalents in chain.
      • parsley.expr.mixed contains combinators that can be used for expression parsing, but where different fixities may be mixed on the same level: this is rare in practice.
    • parsley.implicits contains several implicits to add syntactic sugar to the combinators. These are sub-categorised into the following sub modules:
      • parsley.implicits.character contains implicits to allow you to use character and string literals as parsers.
      • parsley.implicits.combinator contains implicits related to combinators, such as the ability to make any parser into a Parsley[Unit] automatically.
      • parsley.implicits.lift enables postfix application of the lift combinator onto a function (or value).
      • parsley.implicits.zipped enables boths a reversed form of lift where the function appears on the right and is applied on a tuple (useful when type inference has failed) as well as a .zipped method for building tuples out of several combinators.
    • parsley.errors contains modules to deal with error messages, their refinement and generation.
    • parsley.lift contains functions which lift functions that work on regular types to those which now combine the results of parsers returning those same types. these are ubiquitous.
    • parsley.ap contains functions which allow for the application of a parser returning a function to several parsers returning each of the argument types.
    • parsley.registers contains combinators that interact with the context-sensitive functionality in the form of registers.
    • parsley.token contains the Lexer class that provides a host of helpful lexing combinators when provided with the description of a language.
    • parsley.position contains parsers for extracting position information.
    • parsley.genericbridges contains some basic implementations of the Parser Bridge pattern (see Design Patterns for Parser Combinators in Scala, or the parsley wiki): these can be used before more specialised generic bridge traits can be constructed.
    Definition Classes
    root
  • package parsley
    Definition Classes
    root
  • package expr

    This package contains various functionality relating to the parsing of expressions..

    This package contains various functionality relating to the parsing of expressions..

    This includes the "chain" combinators, which tackle the left-recursion problem and allow for the parsing and combining of operators with values. It also includes functionality for constructing larger precedence tables, which may even vary the type of each layer in the table, allowing for strongly-typed expression parsing.

    Definition Classes
    parsley
  • Atoms
  • Fixity
  • GOps
  • InfixL
  • InfixN
  • InfixR
  • Ops
  • Postfix
  • Prec
  • Prefix
  • SOps
  • chain
  • infix
  • mixed
  • precedence

object infix

This module contains the very useful chaining family of combinators, which are mostly used to parse operators and expressions of varying fixities. It is a more low-level API compared with precedence.

Compared with the combinators in chain, these allow for more freedom in the type of the values and the operators.

Source
infix.scala
Since

4.0.0

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  12. def left[A, B, C >: B](p: Parsley[A], op: => Parsley[(C, A) => B], x: C)(implicit wrap: (A) => C): Parsley[C]

    This combinator handles left-associative parsing, and application of, zero or more binary operators between zero or more values.

    This combinator handles left-associative parsing, and application of, zero or more binary operators between zero or more values.

    First parse p, then parse op followed by a p repeatedly. The results of the ps, x1 through xn, are combined with the results of the ops, f1 through fn-1, with left-associative application: fn-1(fn-2(..f1(x1, x2).., xn-1), xn). This application is then returned as the result of the combinator. If p or op fails having consumed input at any point, the whole combinator fails. If no p could be parsed, this combinator will return a default result x.

    Compared with chain.left, this combinator allows the types of the operators to more accurately encode their associativity in their types. The recursive values of type C may only be applied on the left-hand side of the operators.

    A

    the type of the values.

    B

    the type returned by the operator, which must be a subtype of the result type C.

    C

    the result type of the chain, which also fits into the recursive application site of the operators.

    p

    the value to be parsed.

    op

    the operator between each value.

    x

    the default value to return if no ps can be parsed.

    wrap

    a function that can convert the value type into the result type, this is provided automatically when A <:< C.

    returns

    a parser that parses alternating p and op, ending in a p and applies their results left-associatively or returns x if no p was parsed.

    Example:
    1. scala> import parsley.expr.infix
      scala> import parsley.character.{digit, char}
      scala> sealed trait Expr
      scala> case class Add(x: Expr, y: Num) extends Expr
      scala> case class Num(x: Int) extends Expr
      scala> val expr = infix.left[Num, Add, Expr](digit.map(d => Num(d.asDigit)), char('+').as(Add), Num(0))
      scala> expr.parse("1+2+3+4")
      val res0 = Success(Add(Add(Add(Num(1), Num(2)), Num(3)), Num(4)))
      scala> expr.parse("")
      val res1 = Success(Num(0))
    Since

    4.0.0

    See also

    chain.left for a version where the types must match, allowing for flexibility to change the associativity.

  13. def left1[A, B, C >: B](p: Parsley[A], op: => Parsley[(C, A) => B])(implicit wrap: (A) => C): Parsley[C]

    This combinator handles left-associative parsing, and application of, zero or more binary operators between one or more values.

    This combinator handles left-associative parsing, and application of, zero or more binary operators between one or more values.

    First parse p, then parse op followed by a p repeatedly. The results of the ps, x1 through xn, are combined with the results of the ops, f1 through fn-1, with left-associative application: fn-1(fn-2(..f1(x1, x2).., xn-1), xn). This application is then returned as the result of the combinator. If p or op fails having consumed input at any point, the whole combinator fails.

    Compared with chain.left1, this combinator allows the types of the operators to more accurately encode their associativity in their types. The recursive values of type C may only be applied on the left-hand side of the operators.

    A

    the type of the values.

    B

    the type returned by the operator, which must be a subtype of the result type C.

    C

    the result type of the chain, which also fits into the recursive application site of the operators.

    p

    the value to be parsed.

    op

    the operator between each value.

    wrap

    a function that can convert the value type into the result type, this is provided automatically when A <:< C.

    returns

    a parser that parses alternating p and op, ending in a p and applies their results left-associatively.

    Example:
    1. scala> import parsley.expr.infix
      scala> import parsley.character.{digit, char}
      scala> sealed trait Expr
      scala> case class Add(x: Expr, y: Num) extends Expr
      scala> case class Num(x: Int) extends Expr
      scala> val expr = infix.left1[Num, Add, Expr](digit.map(d => Num(d.asDigit)), char('+').as(Add))
      scala> expr.parse("1+2+3+4")
      val res0 = Success(Add(Add(Add(Num(1), Num(2)), Num(3)), Num(4)))
      scala> expr.parse("")
      val res1 = Failure(..)
    Since

    4.0.0

    See also

    chain.left1 for a version where the types must match, allowing for flexibility to change the associativity.

  14. final def ne(arg0: AnyRef): Boolean
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  15. final def notify(): Unit
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  16. final def notifyAll(): Unit
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  17. def right[A, B, C >: B](p: Parsley[A], op: => Parsley[(A, C) => B], x: C)(implicit wrap: (A) => C): Parsley[C]

    This combinator handles right-associative parsing, and application of, zero or more binary operators between zero or more values.

    This combinator handles right-associative parsing, and application of, zero or more binary operators between zero or more values.

    First parse p, then parse op followed by a p repeatedly. The results of the ps, x1 through xn, are combined with the results of the ops, f1 through fn-1, with right-associative application: f1(x1, f2(x2, ..fn-1(xn-1, xn)..)). This application is then returned as the result of the combinator. If p or op fails having consumed input at any point, the whole combinator fails. If no p could be parsed, this combinator will return a default result x.

    Compared with chain.right, this combinator allows the types of the operators to more accurately encode their associativity in their types. The recursive values of type C may only be applied on the right-hand side of the operators.

    A

    the type of the values.

    B

    the type returned by the operator, which must be a subtype of the result type C.

    C

    the result type of the chain, which also fits into the recursive application site of the operators.

    p

    the value to be parsed.

    op

    the operator between each value.

    x

    the default value to return if no ps can be parsed.

    wrap

    a function that can convert the value type into the result type, this is provided automatically when A <:< C.

    returns

    a parser that parses alternating p and op, ending in a p and applies their results right-associatively or returns x if no p was parsed.

    Example:
    1. scala> import parsley.expr.infix
      scala> import parsley.character.{digit, char}
      scala> sealed trait Expr
      scala> case class Add(x: Num, y: Expr) extends Expr
      scala> case class Num(x: Int) extends Expr
      scala> val expr = infix.right[Num, Add, Expr](digit.map(d => Num(d.asDigit)), char('+').as(Add), Num(0))
      scala> expr.parse("1+2+3+4")
      val res0 = Success(Add(Num(1), Add(Num(2), Add(Num(3), Num(4)))))
      scala> expr.parse("")
      val res1 = Success(Num(0))
    Since

    4.0.0

    See also

    chain.right for a version where the types must match, allowing for flexibility to change the associativity.

  18. def right1[A, B, C >: B](p: Parsley[A], op: => Parsley[(A, C) => B])(implicit wrap: (A) => C): Parsley[C]

    This combinator handles right-associative parsing, and application of, zero or more binary operators between one or more values.

    This combinator handles right-associative parsing, and application of, zero or more binary operators between one or more values.

    First parse p, then parse op followed by a p repeatedly. The results of the ps, x1 through xn, are combined with the results of the ops, f1 through fn-1, with right-associative application: f1(x1, f2(x2, ..fn-1(xn-1, xn)..)). This application is then returned as the result of the combinator. If p or op fails having consumed input at any point, the whole combinator fails.

    Compared with chain.right1, this combinator allows the types of the operators to more accurately encode their associativity in their types. The recursive values of type C may only be applied on the right-hand side of the operators.

    A

    the type of the values.

    B

    the type returned by the operator, which must be a subtype of the result type C.

    C

    the result type of the chain, which also fits into the recursive application site of the operators.

    p

    the value to be parsed.

    op

    the operator between each value.

    wrap

    a function that can convert the value type into the result type, this is provided automatically when A <:< C.

    returns

    a parser that parses alternating p and op, ending in a p and applies their results right-associatively.

    Example:
    1. scala> import parsley.expr.infix
      scala> import parsley.character.{digit, char}
      scala> sealed trait Expr
      scala> case class Add(x: Num, y: Expr) extends Expr
      scala> case class Num(x: Int) extends Expr
      scala> val expr = infix.right1[Num, Add, Expr](digit.map(d => Num(d.asDigit)), char('+').as(Add)))
      scala> expr.parse("1+2+3+4")
      val res0 = Success(Add(Num(1), Add(Num(2), Add(Num(3), Num(4)))))
      scala> expr.parse("")
      val res1 = Failure(..)
    Since

    4.0.0

    See also

    chain.right1 for a version where the types must match, allowing for flexibility to change the associativity.

  19. final def synchronized[T0](arg0: => T0): T0
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