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.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.syntax contains several implicits to add syntactic sugar to the combinators. These are sub-categorised into the following sub modules:
      • parsley.syntax.character contains implicits to allow you to use character and string literals as parsers.
      • parsley.syntax.lift enables postfix application of the lift combinator onto a function (or value).
      • parsley.syntax.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.syntax.extension contains syntactic sugar combinators exposed as implicit classes.
    • 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.state contains combinators that interact with the context-sensitive functionality in the form of state.
    • 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.generic 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 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
  • package text

    This package contains the abstract parsers for parsing string and character literals.

    This package contains the abstract parsers for parsing string and character literals.

    Definition Classes
    token
    Since

    4.0.0

  • CharacterParsers
  • StringParsers
c

parsley.token.text

CharacterParsers

abstract class CharacterParsers extends AnyRef

This class defines a uniform interface for defining parsers for character literals, independent of how whitespace should be handled after the literal.

Source
Character.scala
Since

4.0.0

Note

implementations of this class found within Lexer may employ sharing and refine the defs in this class into val or lazy val when overriding.

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Abstract Value Members

  1. abstract def ascii: Parsley[Char]

    This parser will parse a single character literal, which may contain any graphic ASCII character.

    This parser will parse a single character literal, which may contain any graphic ASCII character. These are characters with ordinals in range 0 to 127 inclusive. It may also contain escape sequences, but only those which result in ASCII characters.

    Example:

    1. scala> ascii.parse("'a'")
val res0 = Success('a')
scala> ascii.parse("'£'")
val res1 = Failure(...) // £'s ordinal is not less than 127
scala> ascii.parse("'λ'")
val res2 = Failure(...) // λ's ordinal is not less than 127
scala> ascii.parse("'🙂'")
val res3 = Failure(...) // 🙂's ordinal is not less than 127
    Since

    4.0.0

    Note

    the exact behaviour of this parser is decided by the implementations given in Lexer, which will depend on user-defined configuration. Please see the relevant documentation of these specific objects.

  2. abstract def basicMultilingualPlane: Parsley[Char]

    This parser will parse a single character literal, which may contain any graphic character that falls within the "Basic Multilingual Plane" (BMP).

    This parser will parse a single character literal, which may contain any graphic character that falls within the "Basic Multilingual Plane" (BMP). This is defined as any UTF-16 character that fits into 16 bits. A Scala Char is exactly large enough to hold any BMP character. It may also contain escape sequences, but only those which result in BMP characters.

    Example:

    1. scala> basicMultilingualPlane.parse("'a'")
val res0 = Success('a')
scala> basicMultilingualPlane.parse("'£'")
val res1 = Success('£')
scala> basicMultilingualPlane.parse("'λ'")
val res2 = Success('λ')
scala> basicMultilingualPlane.parse("'🙂'")
val res3 = Failure(...) // 🙂 has a 32-bit codepoint of larger than 0xffff
    Since

    4.0.0

    Note

    the exact behaviour of this parser is decided by the implementations given in Lexer, which will depend on user-defined configuration. Please see the relevant documentation of these specific objects.

  3. abstract def fullUtf16: Parsley[Int]

    This parser will parse a single character literal, which may contain any unicode graphic character as defined by up to two UTF-16 codepoints.

    This parser will parse a single character literal, which may contain any unicode graphic character as defined by up to two UTF-16 codepoints. It may also contain escape sequences.

    Example:

    1. scala> fullUtf16.parse("'a'")
val res0 = Success(97)
scala> fullUtf16.parse("'£'")
val res1 = Success(163)
scala> fullUtf16.parse("'λ'")
val res2 = Success(0x03BB)
scala> fullUtf16.parse("'🙂'")
val res3 = Success(0x1F642)
    Since

    4.0.0

    Note

    the exact behaviour of this parser is decided by the implementations given in Lexer, which will depend on user-defined configuration. Please see the relevant documentation of these specific objects.

  4. abstract def latin1: Parsley[Char]

    This parser will parse a single character literal, which may contain any graphic extended ASCII character.

    This parser will parse a single character literal, which may contain any graphic extended ASCII character. These are characters with ordinals in range 0 to 255 inclusive. It may also contain escape sequences, but only those which result in extended ASCII characters.

    Example:

    1. scala> latin1.parse("'a'")
val res0 = Success('a')
scala> latin1.parse("'£'")
val res1 = Success('£')
scala> latin1.parse("'λ'")
val res2 = Failure(...) // λ's ordinal is not less than 255
scala> latin1.parse("'🙂'")
val res3 = Failure(...) // 🙂's ordinal is not less than 255
    Since

    4.0.0

    Note

    the exact behaviour of this parser is decided by the implementations given in Lexer, which will depend on user-defined configuration. Please see the relevant documentation of these specific objects.

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