Language.Haskell.Exts.Parser

Parser for Haskell with extensions.

General parsing

class Parseable ast where

Class to reuse the parse function at many different types.

Methods

parse :: String -> ParseResult ast

Parse a string with default mode.

parseWithMode :: ParseMode -> String -> ParseResult ast

Parse a string with an explicit mode.

parseWithComments :: ParseMode -> String -> ParseResult (ast, [Comment])

Parse a string with an explicit mode, returning all comments along the AST

Instances

Parseable Pat

Parseable Exp

Parseable Type

Parseable Decl

Parseable Module

SrcInfo loc => Parseable (Stmt loc)

SrcInfo loc => Parseable (Pat loc)

SrcInfo loc => Parseable (Exp loc)

SrcInfo loc => Parseable (Type loc)

SrcInfo loc => Parseable (Decl loc)

SrcInfo loc => Parseable (Module loc)

data ParseMode

Static parameters governing a parse. Note that the various parse functions in Language.Haskell.Exts.Parser never look at LANGUAGE pragmas, regardless of what the ignoreLanguagePragmas flag is set to. Only the various parseFile functions in Language.Haskell.Exts will act on it, when set to False.

Constructors

ParseMode

Fields

parseFilename :: String

original name of the file being parsed

baseLanguage :: Language

base language (e.g. Haskell98, Haskell2010)

extensions :: [Extension]

list of extensions enabled for parsing

ignoreLanguagePragmas :: Bool

if True, the parser won't care about further extensions in LANGUAGE pragmas in source files

ignoreLinePragmas :: Bool

if True, the parser won't read line position information from LINE pragmas in source files

fixities :: Maybe [Fixity]

list of fixities to be aware of

defaultParseMode :: ParseMode

Default parameters for a parse. The default is an unknown filename, no extensions (i.e. Haskell 98), don't ignore LANGUAGE pragmas, do ignore LINE pragmas, and be aware of fixities from the Prelude.

data ParseResult a

The result of a parse.

Constructors

ParseOk a

The parse succeeded, yielding a value.

ParseFailed SrcLoc String

The parse failed at the specified source location, with an error message.

Instances

Monad ParseResult

Functor ParseResult

Applicative ParseResult

Show a => Show (ParseResult a)

Monoid m => Monoid (ParseResult m)

fromParseResult :: ParseResult a -> a

Retrieve the result of a successful parse, throwing an error if the parse is actually not successful.

Parsing of specific AST elements

Modules

parseModule :: String -> ParseResult Module

Parse of a string, which should contain a complete Haskell module.

parseModuleWithMode :: ParseMode -> String -> ParseResult Module

Parse of a string containing a complete Haskell module, using an explicit mode.

parseModuleWithComments :: ParseMode -> String -> ParseResult (Module, [Comment])

Parse of a string containing a complete Haskell module, using an explicit mode, retaining comments.

Expressions

parseExp :: String -> ParseResult Exp

Parse of a string containing a Haskell expression.

parseExpWithMode :: ParseMode -> String -> ParseResult Exp

Parse of a string containing a Haskell expression, using an explicit mode.

parseExpWithComments :: ParseMode -> String -> ParseResult (Exp, [Comment])

Parse of a string containing a complete Haskell module, using an explicit mode, retaining comments.

Statements

parseStmt :: String -> ParseResult Stmt

Parse of a string containing a Haskell type.

parseStmtWithMode :: ParseMode -> String -> ParseResult Stmt

Parse of a string containing a Haskell type, using an explicit mode.

parseStmtWithComments :: ParseMode -> String -> ParseResult (Stmt, [Comment])

Parse of a string containing a complete Haskell module, using an explicit mode, retaining comments.

Patterns

parsePat :: String -> ParseResult Pat

Parse of a string containing a Haskell pattern.

parsePatWithMode :: ParseMode -> String -> ParseResult Pat

Parse of a string containing a Haskell pattern, using an explicit mode.

parsePatWithComments :: ParseMode -> String -> ParseResult (Pat, [Comment])

Parse of a string containing a complete Haskell module, using an explicit mode, retaining comments.

Declarations

parseDecl :: String -> ParseResult Decl

Parse of a string containing a Haskell top-level declaration.

parseDeclWithMode :: ParseMode -> String -> ParseResult Decl

Parse of a string containing a Haskell top-level declaration, using an explicit mode.

parseDeclWithComments :: ParseMode -> String -> ParseResult (Decl, [Comment])

Parse of a string containing a complete Haskell module, using an explicit mode, retaining comments.

Types

parseType :: String -> ParseResult Type

Parse of a string containing a Haskell type.

parseTypeWithMode :: ParseMode -> String -> ParseResult Type

Parse of a string containing a Haskell type, using an explicit mode.

parseTypeWithComments :: ParseMode -> String -> ParseResult (Type, [Comment])

Parse of a string containing a complete Haskell module, using an explicit mode, retaining comments.

Option pragmas

getTopPragmas :: String -> ParseResult [ModulePragma]