| haskell-src-exts-1.9.0: Manipulating Haskell source: abstract syntax, lexer, parser, and pretty-printer | Source code | Contents | Index

Language.Haskell.Exts.Annotated.Build

Portability | portable
Stability | experimental
Maintainer | Niklas Broberg, d00nibro@chalmers.se

Contents

Syntax building functions
More advanced building

Description
This module contains combinators to use when building Haskell source trees programmatically, as opposed to parsing them from a string. The contents here are quite experimental and will likely receive a lot of attention when the rest has stabilised.
Synopsis

name :: l -> String -> Name l
sym :: l -> String -> Name l
var :: l -> Name l -> Exp l
op :: l -> Name l -> QOp l
qvar :: l -> ModuleName l -> Name l -> Exp l
pvar :: l -> Name l -> Pat l
app :: l -> Exp l -> Exp l -> Exp l
infixApp :: l -> Exp l -> QOp l -> Exp l -> Exp l
appFun :: [l] -> Exp l -> [Exp l] -> Exp l
pApp :: l -> Name l -> [Pat l] -> Pat l
tuple :: l -> [Exp l] -> Exp l
pTuple :: l -> [Pat l] -> Pat l
varTuple :: l -> [Name l] -> Exp l
pvarTuple :: l -> [Name l] -> Pat l
function :: l -> String -> Exp l
strE :: l -> String -> Exp l
charE :: l -> Char -> Exp l
intE :: l -> Integer -> Exp l
strP :: l -> String -> Pat l
charP :: l -> Char -> Pat l
intP :: l -> Integer -> Pat l
doE :: l -> [Stmt l] -> Exp l
lamE :: l -> [Pat l] -> Exp l -> Exp l
letE :: l -> [Decl l] -> Exp l -> Exp l
caseE :: l -> Exp l -> [Alt l] -> Exp l
alt :: l -> Pat l -> Exp l -> Alt l
altGW :: l -> Pat l -> [Stmt l] -> Exp l -> Binds l -> Alt l
listE :: l -> [Exp l] -> Exp l
eList :: l -> Exp l
peList :: l -> Pat l
paren :: l -> Exp l -> Exp l
pParen :: l -> Pat l -> Pat l
qualStmt :: l -> Exp l -> Stmt l
genStmt :: l -> Pat l -> Exp l -> Stmt l
letStmt :: l -> [Decl l] -> Stmt l
binds :: l -> [Decl l] -> Binds l
noBinds :: l -> Binds l
wildcard :: l -> Pat l
genNames :: l -> String -> Int -> [Name l]
sfun :: l -> Name l -> [Name l] -> Rhs l -> Maybe (Binds l) -> Decl l
simpleFun :: l -> Name l -> Name l -> Exp l -> Decl l
patBind :: l -> Pat l -> Exp l -> Decl l
patBindWhere :: l -> Pat l -> Exp l -> [Decl l] -> Decl l
nameBind :: l -> Name l -> Exp l -> Decl l
metaFunction :: l -> String -> [Exp l] -> Exp l
metaConPat :: l -> String -> [Pat l] -> Pat l

Syntax building functions

name :: l -> String -> Name l | Source

An identifier with the given string as its name. The string should be a valid Haskell identifier.

sym :: l -> String -> Name l | Source

A symbol identifier. The string should be a valid Haskell symbol identifier.

var :: l -> Name l -> Exp l | Source

A local variable as expression.

op :: l -> Name l -> QOp l | Source

Use the given identifier as an operator.

qvar :: l -> ModuleName l -> Name l -> Exp l | Source

A qualified variable as expression.

pvar :: l -> Name l -> Pat l | Source

A pattern variable.

app :: l -> Exp l -> Exp l -> Exp l | Source

Application of expressions by juxtaposition.

infixApp :: l -> Exp l -> QOp l -> Exp l -> Exp l | Source

Apply an operator infix.

appFun :: [l] -> Exp l -> [Exp l] -> Exp l | Source

Apply a function to a list of arguments.

pApp :: l -> Name l -> [Pat l] -> Pat l | Source

A constructor pattern, with argument patterns.

tuple :: l -> [Exp l] -> Exp l | Source

A tuple expression.

pTuple :: l -> [Pat l] -> Pat l | Source

A tuple pattern.

varTuple :: l -> [Name l] -> Exp l | Source

A tuple expression consisting of variables only.

pvarTuple :: l -> [Name l] -> Pat l | Source

A tuple pattern consisting of variables only.

function :: l -> String -> Exp l | Source

A function with a given name.

strE :: l -> String -> Exp l | Source

A literal string expression.

charE :: l -> Char -> Exp l | Source

A literal character expression.

intE :: l -> Integer -> Exp l | Source

A literal integer expression.

strP :: l -> String -> Pat l | Source

A literal string pattern.

charP :: l -> Char -> Pat l | Source

A literal character pattern.

intP :: l -> Integer -> Pat l | Source

A literal integer pattern.

doE :: l -> [Stmt l] -> Exp l | Source

A do block formed by the given statements. The last statement in the list should be a `Qualifier` expression.

lamE :: l -> [Pat l] -> Exp l -> Exp l | Source

Lambda abstraction, given a list of argument patterns and an expression body.

letE :: l -> [Decl l] -> Exp l -> Exp l | Source

A `let` ... `in` block.

caseE :: l -> Exp l -> [Alt l] -> Exp l | Source

A `case` expression.

alt :: l -> Pat l -> Exp l -> Alt l | Source

An unguarded alternative in a `case` expression.

altGW :: l -> Pat l -> [Stmt l] -> Exp l -> Binds l -> Alt l | Source

An alternative with a single guard in a `case` expression.

listE :: l -> [Exp l] -> Exp l | Source

A list expression.

eList :: l -> Exp l | Source

The empty list expression.

peList :: l -> Pat l | Source

The empty list pattern.

paren :: l -> Exp l -> Exp l | Source

Put parentheses around an expression.

pParen :: l -> Pat l -> Pat l | Source

Put parentheses around a pattern.

qualStmt :: l -> Exp l -> Stmt l | Source

A qualifier expression statement.

genStmt :: l -> Pat l -> Exp l -> Stmt l | Source

A generator statement: pat `<-` exp

letStmt :: l -> [Decl l] -> Stmt l | Source

A `let` binding group as a statement.

binds :: l -> [Decl l] -> Binds l | Source

Hoist a set of declarations to a binding group.

noBinds :: l -> Binds l | Source

An empty binding group.

wildcard :: l -> Pat l | Source

The wildcard pattern: `_`

genNames :: l -> String -> Int -> [Name l] | Source

Generate k names by appending numbers 1 through k to a given string.
More advanced building

sfun :: l -> Name l -> [Name l] -> Rhs l -> Maybe (Binds l) -> Decl l | Source

A function with a single clause

simpleFun :: l -> Name l -> Name l -> Exp l -> Decl l | Source

A function with a single clause, a single argument, no guards and no where declarations

patBind :: l -> Pat l -> Exp l -> Decl l | Source

A pattern bind where the pattern is a variable, and where there are no guards and no 'where' clause.

patBindWhere :: l -> Pat l -> Exp l -> [Decl l] -> Decl l | Source

A pattern bind where the pattern is a variable, and where there are no guards, but with a 'where' clause.

nameBind :: l -> Name l -> Exp l -> Decl l | Source

Bind an identifier to an expression.

metaFunction :: l -> String -> [Exp l] -> Exp l | Source

Apply function of a given name to a list of arguments.

metaConPat :: l -> String -> [Pat l] -> Pat l | Source

Apply a constructor of a given name to a list of pattern arguments, forming a constructor pattern.
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