object precedence
This object is used to construct precedence parsers from either a Levels or many Ops[A, A].
- Since
2.2.0
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- precedence
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- def apply[A, B](atom: => Parsley[A], table: Levels[A, B]): Parsley[B]
This is used to build an expression parser for a multi-layered expression tree type.
This is used to build an expression parser for a multi-layered expression tree type. Levels are specified from strongest to weakest.
- A
The type of the atomic unit of the expression
- B
The type of the resulting parse tree (outermost operations)
- atom
The atomic unit of the expression
- table
A table of operators. Table is ordered highest precedence to lowest precedence. See Levels and it's subtypes for a description of how the types work.
- returns
A parser for the described expression language
- Since
2.2.0
- def apply[A](atom: => Parsley[A], table: Ops[A, A]*): Parsley[A]
This is used to build an expression parser for a monolithic type.
This is used to build an expression parser for a monolithic type. Levels are specified from strongest to weakest.
- A
The type of the monolithic tree
- atom
The atomic unit of the expression, for instance numbers/variables
- table
A table of operators. Table is ordered highest precedence to lowest precedence. Each list in the table corresponds to operators of the same precedence level.
- returns
A parser for the described expression language
- Since
2.2.0
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This is the documentation for Parsley.
Package structure
The parsley package contains the
Parsleyclass, as well as theResult,Success, andFailuretypes. 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.Parsleycontains the bulk of the core "function-style" combinators, as well as the implicit classes which enable the "method-style" combinators.parsley.combinatorcontains many helpful combinators that simplify some common parser patterns.parsley.charactercontains the combinators needed to read characters and strings, as well as combinators to match specific sub-sets of characters.parsley.debugcontains debugging combinators, helpful for identifying faults in parsers.parsley.exprcontains the following sub modules:parsley.expr.chaincontains combinators used in expression parsingparsley.expr.precedenceis a builder for expression parsers built on a precedence table.parsley.implicitscontains several implicits to add syntactic sugar to the combinators, such as being able to use character and string literals directly as parsers, as well as enabling lifting of functions to work on parsers.parsley.liftcontains 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.registerscontains combinators that interact with the context-sensitive functionality in the form of registers.parsley.tokencontains theLexerclass that provides a host of helpful lexing combinators when provided with the description of a language.parsley.unsafecontains unsafe (and not thread-safe) ways of speeding up the execution of a parser.In addition to the modules and packages outlined above, this version of Parsley (up to version 3.0), also includes the so-called
old-styleAPI, which is deprecated (see the Parsley wiki for a discussion of these differences). You should use the modules described above, and avoid the following:parsley.BitGenparsley.Charparsley.CharSetparsley.Combinatorparsley.ExpressionParserparsley.Implparsley.Implicitsparsley.LanguageDefparsley.NotRequiredparsley.Parserparsley.Predicateparsley.Regparsley.TokenParser