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 errors

    This package contains various functionality relating to the generation and formatting of error messages.

    This package contains various functionality relating to the generation and formatting of error messages.

    In particular, it includes a collection of combinators for improving error messages within the parser, including labelling and providing additional information. It also contains combinators that can be used to valid data produced by a parser, to ensure it conforms to expected invariances, producing good quality error messages if this is not the case. Finally, this package contains ways of changing the formatting of error messages: this can either be changing how the default String-based errors are formatted, or by injectiing Parsley's errors into a custom error object.

    Definition Classes
    parsley
  • 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
  • package implicits

    This package contains various functionality that involve Scala's implicits mechanism.

    This package contains various functionality that involve Scala's implicits mechanism.

    This includes conversions from scala literals into parsers, as well as enabling new syntax on regular Scala values (such as Parsley's lift or zipped syntax). Automatic conversion to Parsley[Unit] is also supported within this package.

    Definition Classes
    parsley
  • character
  • combinator
  • lift
  • zipped
  • package token

    This package provides a wealth of functionality for performing common lexing tasks.

    This package provides a wealth of functionality for performing common lexing tasks.

    It is organised as follows:

    • the main parsing functionality is accessed via Lexer, which provides implementations for the combinators found in the sub-packages given a LexicalDesc.
    • the descriptions sub-package is how a lexical structure can be described, providing the configuration that alters the behaviour of the parsers produced by the Lexer.
    • the other sub-packages contain the high-level interfaces that the Lexer exposes, which can be used to pass whitespace-aware and non-whitespace-aware combinators around in a uniform way.
    • the predicate module contains functionality to help define boolean predicates on characters or unicode codepoints.
    Definition Classes
    parsley
p

parsley

implicits

package implicits

This package contains various functionality that involve Scala's implicits mechanism.

This includes conversions from scala literals into parsers, as well as enabling new syntax on regular Scala values (such as Parsley's lift or zipped syntax). Automatic conversion to Parsley[Unit] is also supported within this package.

Source
package.scala
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  1. object character

    Provides implicit conversions for characters and strings into parsers.

    Provides implicit conversions for characters and strings into parsers.

    The use of char and string can be distracting to the overall structure of the parser with respect to the grammar. This module exposes combinators that can implicitly convert Scala's string and character literals so that they represent parsers. These will not be whitespace sensitive.

    Since

    3.0.0

  2. object combinator

    Provides implicit conversions for parsers into unit parsers, and other implicits involving combinators.

    Provides implicit conversions for parsers into unit parsers, and other implicits involving combinators.

    Since

    3.0.0

  3. object lift

    This module provides the "lift syntax", which enables a lift combinator on functions of arities up to 22, applying the function across the results of several parsers.

    This module provides the "lift syntax", which enables a lift combinator on functions of arities up to 22, applying the function across the results of several parsers.

    Example:

    1. scala> import parsley.character.char
scala> import parsley.implicits.lift.{Lift2, Lift3}
scala> case class Add(x: Int, y: Int)
scala> val p = Add.lift(char('a') #> 4, char('b') #> 5)
scala> p.parse("ab")
val res0 = Success(Add(4, 5))
scala> val f = (x: Int, y: Int, z: Int) => x * y + z
scala> val q = f.lift(char('a') #> 3, char('b') #> 2, char('c') #> 5)
scala> q.parse("abc")
val res1 = Success(11)
scala> q.parse("ab")
val res2 = Failure(..)
    Since

    3.0.0

    Note

    a limitation of this syntax is that it requires the function's type to be fully known. For a version of this syntax that behaves better with type inference, see zipped.

  4. object zipped

    This module provides alternatives to the f.lift(x, y) syntax, (x, y).zipped(f), which works better with type inference.

    This module provides alternatives to the f.lift(x, y) syntax, (x, y).zipped(f), which works better with type inference.

    Also enables a parameterless zipped method, to pair an arbitrary number of parsers such that (p, q).zipped = p.zip(q).

    Thanks to Andrei Gramescu and George Stacey for ensuring that these combinators even exist in the first place.

    Example:

    1. scala> import parsley.character.char
scala> import parsley.implicits.zipped.{Zipped2, Zipped3}
scala> case class Add(x: Int, y: Int)
scala> val p = (char('a') #> 4, char('b') #> 5).zipped(Add)
scala> p.parse("ab")
val res0 = Success(Add(4, 5))
scala> val q = (char('a') #> 3, char('b') #> 2, char('c') #> 5).zipped((x, y, z) => x * y + z)
scala> q.parse("abc")
val res1 = Success(11)
scala> q.parse("ab")
val res2 = Failure(..)
    Since

    3.0.0

    Note

    these methods are not lazy like the lift syntax or liftN functions! Use the prefix ~ combinator to make arguments lazy where necessary.

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