There are five modules that provide quasiquoters, each for a different C variant. C parses C99, GCC parses C99 plus GNU extensions, CUDA parses C99 plus GNU and CUDA extensions, OpenCL parses C99 plus GNU and OpenCL extensions and, ObjC parses C99 plus a subset of Objective-C

For version of GHC prior to 7.4, the quasiquoters generate Template Haskell expressions that use data constructors that must be in scope where the quasiquoted expression occurs. You will be safe if you add the following imports to any module using the quasiquoters provided by this package:

import qualified Data.Loc
import qualified Language.C.Syntax

These modules may also be imported unqualified, of course. The quasiquoters also use some constructors defined in the standard Prelude, so if it is not imported by default, it must be imported qualified. On GHC 7.4 and above, you can use the quasiquoters without worrying about what names are in scope.

The following quasiquoters are defined:

cdecl

Declaration, of type InitGroup.

cedecl

External declarations (top-level declarations in a C file, including function definitions and declarations), of type Definition.

cenum

Component of an enum definition, of type CEnum.

cexp

Expression, of type Stm.

cstm

Statement, of type Stm.

cstms

A list of statements, of type [Stm].

citem

Block item, of type BlockItem. A block item is either a declaration or a statement.

citems

A list of block items, of type @[BlockItem].

cfun

Function definition, of type Func.

cinit

Initializer, of type Initializer.

cparam

Declaration of a function parameter, of type Param.

cparams

Declaration of function parameters, of type [Param].

csdecl

Declaration of a struct member, of type FieldGroup.

ctyquals

A list of type qualifiers, of type [TyQual].

cty

A C type, of type Type.

cunit

A compilation unit, of type [Definition].

In addition, Objective-C support defines the following quasiquoters:

objcprop

Property declaration of type ObjCIfaceDecl.

objcifdecls

Interface declarations of type [ObjCIfaceDecl]

objcimdecls

Class implementation declarations of type [Definition]

objcdictelem

Dictionary element, of type ObjCDictElem

objcpropattr

Property attribute element, of type ObjCPropAttr

objcmethparam

Method parameter, of type ObjCParam

objcmethproto

Method prototype, of type ObjCMethodProto

objcmethdef

Method definition, of type Definition

objcrecv

Receiver, of type ObjCRecv

objcarg

Keyword argument, of type ObjCArg

Antiquotations allow splicing in subterms during quotation. These subterms may bound to a Haskell variable or may be the value of a Haskell expression. Antiquotations appear in a quasiquotation in the form $ANTI:VARID, where ANTI is a valid antiquote specifier and VARID is a Haskell variable identifier, or in the form $ANTI:(EXP), where EXP is a Haskell expressions (the parentheses must appear in this case). The Haskell expression may itself contain a quasiquote, but in that case the final |] must be escaped as \|\]. Additionally, $VARID is shorthand for $exp:VARID and $(EXP) is shorthand for $exp:(EXP), i.e., exp is the default antiquote specifier.

It is often useful to use typedefs that aren't in scope when quasiquoting, e.g., [cdecl|uint32_t foo;|]. The quasiquoter will complain when it sees this because it thinks uint32_t is an identifier. The solution is to use the typename keyword, borrowed from C++, to tell the parser that the identifier is actually a type name. That is, we can write [cdecl|typename uint32_t foo;|] to get the desired behavior.

Valid antiquote specifiers are:

id

A C identifier. The argument must be an instance of ToIdent.

comment

A comment to be attached to a statement. The argument must have type String, and the antiquote must appear in a statement context.

const

A constant. The argument must be an instance of ToConst.

int

An integer constant. The argument must be an instance of Integral.

uint

An unsigned integer constant. The argument must be an instance of Integral.

lint

A long integer constant. The argument must be an instance of Integral.

ulint

An unsigned long integer constant. The argument must be an instance of Integral.

llint

A long long integer constant. The argument must be an instance of Integral.

ullint

An unsigned long long integer constant. The argument must be an instance of Integral.

float

A float constant. The argument must be an instance of Fractional.

double

A double constant. The argument must be an instance of Fractional.

long double

A long double constant. The argument must be an instance of Fractional.

char

A char constant. The argument must have type Char.

string

A string (char*) constant. The argument must have type String.

exp

A C expression. The argument must be an instance of ToExp.

func

A function definition. The argument must have type Func.

args

A list of function arguments. The argument must have type [Stm].

decl

A declaration. The argument must have type InitGroup.

decls

A list of declarations. The argument must have type [InitGroup].

sdecl

A struct member declaration. The argument must have type FieldGroup.

sdecls

A list of struct member declarations. The argument must have type [FieldGroup].

enum

An enum member. The argument must have type CEnum.

enums

An list of enum members. The argument must have type [CEnum].

esc

An arbitrary top-level C "definition," such as an #include or a #define. The argument must have type String. Also: an uninterpreted, expression-level C escape hatch, which is useful for passing through macro calls. The argument must have type String.

escstm

An uninterpreted, statement-level C escape hatch, which is useful for passing through macro calls. The argument must have type String.

edecl

An external definition. The argument must have type Definition.

edecls

An list of external definitions. The argument must have type [Definition].

item

A statement block item. The argument must have type BlockItem.

items

A list of statement block item. The argument must have type [BlockItem].

stm

A statement. The argument must have type Stm.

stms

A list of statements. The argument must have type [Stm].

tyqual

A type qualifier. The argument must have type TyQual.

tyquals

A list of type qualifiers. The argument must have type [TyQual].

ty

A C type. The argument must have type Type.

spec

A declaration specifier. The argument must have type DeclSpec.

param

A function parameter. The argument must have type Param.

params

A list of function parameters. The argument must have type [Param].

pragma

A pragma statement. The argument must have type String.

init

An initializer. The argument must have type Initializer.

inits

A list of initializers. The argument must have type [Initializer].

In addition, Objective-C code can use these antiquote specifiers:

ifdecl

A class interface declaration. The argument must have type ObjCIfaceDecl.

ifdecls

A list of class interface declaration. The argument must have type [ObjCIfaceDecl].

prop

A property declaration. The argument must have type ObjCIfaceDecl.

props

A list of property declarations. The argument must have type [ObjCIfaceDecl].

propattr

A property attribute. The argument must have type ObjCPropAttr.

propattrs

A list of property attribute. The argument must have type [ObjCPropAttr].

dictelems

A list dictionary elements. The argument must have type [ObjCDictElem].

methparam

A method parameter. The argument must have type ObjCParam.

methparams

A list of method parameters. The argument must have type [ObjCParam].

methproto

A method prototype. The argument must have type ObjCMethodProto.

methdef

A method definition. The argument must have type [Definition].

methdefs

A list of method definitions. The argument must have type [Definition].

recv

A receiver. The argument must have type ObjCRecv.

kwarg

A keywords argument. The argument must have type ObjCArg.

kwargs

A list of keyword arguments. The argument must have type [ObjCArg].