Here is the collection of libraries contained in the
distribution of
PAKCS.
Most of these libraries have been implemented during the development
of larger Curry applications. If you have suggestions for
changes/improvements or if you want to contribute your own library,
please contact
Michael Hanus.
Prelude

This is the standard prelude, i.e., the main library which is added
to every Curry program.
AllSolutions

This library contains a collection of functions for
obtaining lists of solutions to constraints.
These operations are useful to encapsulate
nondeterministic operations between I/O actions in
order to connects the worlds of logic and functional programming
and to avoid nondeterminism failures on the I/O level.
Assertion

This library defines the datatype and functions for the
Curry module tester "currytest".
Char

This library contains some useful functions on characters.
CHR

This library defines CHR(Curry), a representation of CHR rules in Curry,
an interpreter for CHR rules, and a compiler into CHR(Prolog).
CHRcompiled

This library defines the structure of CHR goals and some constructors
to be used in compiled CHR(Curry) rules.
CLPFD

This library supports constraint programming with
finite domain constraints.
CLPR

This library supports constraint programming with
arithmetic constraints over real numbers.
CLPB

This library provides a Boolean constraint solver based on BDDs.
Combinatorial

This library contains a collection of common nondeterministic
and/or combinatorial operations.
Constraint

This library contains
some useful operations for constraint programming.
CSV

This library supports reading/writing files in CSV
(comma separated values) format that can be imported and exported
by most spreadsheed and database applications.
Database

Library for accessing and storing data in databases.
The contents of a database is represented in this library
as dynamic predicates that are defined by facts than can change over
time and can be persistently stored.
All functions in this library distinguishes between queries that
access the database and transactions that manipulates data
in the database. Transactions have a monadic structure.
Both queries and transactions can be executed as I/O actions.
However, arbitrary I/O actions cannot be embedded in transactions.
The ideas of this library are described in
this paper.
Debug

This library contains some useful operation for debugging programs.
Directory

This library supports the access to the directory structure of the
underlying operating system.
Distribution

This library contains functions to obtain information concerning the current
distribution of the Curry implementation, e.g., compiler version,
load paths, front end.
Dynamic

This library supports the manipulation of dynamic predicates,
i.e., predicates that are defined by facts than can change over
time and can be persistently stored.
The ideas of this library are described in
this paper.
Remark:
This library has been revised to the library
Database
.
Thus, it might not be further supported in the future.
Either

This library contains some useful operation for
the
Either
data type.
FileGoodies

A collection of useful operations when dealing with files.
Findall

This library contains some operations for encapsulating search
which were previously part of the standard prelude.
Since there are alternative and better approaches
the encpasulate search, e.g., set functions,
these operations are now in a separate module
in order to keep the standard prelude more portable.
Float

A collection of operations on floating point numbers.
Function

A collection of utility operations for function application.
Global

This library provides functionality for global entities.
A global entity has a name declared in the program.
Its value can be accessed and modified by IO actions.
Furthermore, global entities can be persistent so that
their values are stored across different program executions.
GlobalVariable

This library implements global variables.
A global variable has a name declared in the program.
Its value can be accessed and modified by IO actions.
Values of global variables can contain logic variables shared with
computations running in the same computation space.
As a consequence, values of global variables are not kept
across different program executions.
GUI

This library contains definitions and functions to
implement graphical user interfaces for Curry programs.
It is based on Tcl/Tk and its basic ideas are described in detail
here.
Integer

A collection of common operations on integer numbers.
IO

This library contains IO operations, like reading and writing files,
that are not already contained in the prelude.
IOExts

This library contains some useful extensions to the IO monad,
in particular, the implementation of a global state.
JavaScript

A library to represent JavaScript programs.
KeyDatabaseSQLite

This library provides a general interface for databases
(persistent predicates based on the library
Database
)
where each entry consists of a key and an info part.
KeyDatabaseSQLite

This library provides a general interface for databases
(persistent predicates based on the library
Database
)
where each entry consists of a key and an info part.
It reimplements the interface of the module
KeyDatabase
based on the
SQLite database engine.
KeyDB

This library provides a general interface for databases
(persistent predicates) where each entry consists of a key and an info
part.
Remark:
This library has been revised to the library
KeyDatabase
.
Thus, it might not be further supported in the future.
List

This library contains some useful operations on lists which are not
contained in the
standard prelude
.
Maybe

This library contains some useful operations on the Maybe type which are not
contained in the
standard prelude
.
NamedSocket

This library contains operations for network programming with sockets
where sockets are addressed by symbolic names rather than numbers.
Parser

This library defines (functional logic) parser combinators
to support a simple implementation of parsers in Curry.
It is adapted from Rafael Caballero and Francisco J. LopezFraguas:
A Functional Logic Perspective of Parsing,
Proc. FLOPS'99, Springer LNCS 1722, pp. 8599, 1999
Ports

This library supports the development of concurrent and
distributed applications in Curry by defining ports
for sending and receiving messages, possibly containing
logical variables. A detailed description
of the idea and use of ports can be found
here.
Pretty

This library provides combinators to support the definition
of pretty printers for structured text.
Profile

This library contains limited and preliminary support
for profiling. Currently, it supports the possibility
to show the time and space needed to evaluate a term to its normal form.
Prolog

A library to represent Prolog programs.
PropertyFile

This library defines some functions to read and update files
containing properties in the usual equational syntax.
Read

This library defines some functions for reading special tokens
(naturals, integers, hexadecimal numbers) from strings.
This library is included for backward compatibility only.
You should use the library
ReadNumeric
which provides a better interface
for these functions.
ReadNumeric

This library defines some functions for reading numeric tokens
(naturals, integers, hexadecimal numbers) from strings and converting
them to numbers.
ReadShowTerm

This library contains functions for converting ground data terms
to strings and vice versa.
SetFunctions

This library contains a prototypical implementation of set functions
to encapsulate nondeterministic computations. The general idea of
set functions is described in
this paper
but the implementation in this library is more restricted than
the general approach.
Socket

This library contains basic operations for network programming with sockets.
System

This library supports the access to parts of the system environment,
like the current date and time, environment variables,
system calls etc.
Time

This library contains definitions and functions to
handle date and time information.
Unsafe

This library contains unsafe operations which should not be used.
Data structures and algorithms:
Array

An implementation of arrays with Braun Trees.
Dequeue

An implementation of doubleended queues supporting access at both
ends in constant amortized time.
FiniteMap

An implementation of finite maps.
A finite map is an efficient purely functional data structure
to store a mapping from keys to values.
GraphInductive

A library for inductive graphs (port of a Haskell library by Martin Erwig).
Graphs are composed and decomposed in an inductive way.
Random

This library provides operations for generating pseudorandom
number sequences.
RedBlackTree

This library provides an efficient implementation of redblack trees.
It serves as the base for the libraries
SetRBT
and TableRBT
.
All the operations on trees are generic, i.e., one has to provide
explicit order predicates on elements.
SetRBT

This library provides an efficient implementation of sets
as redblack trees. The implementation is generic in the types
of elements and the set operations require an ordering predicate on elements.
The library also contains a generic sort function
with complexity O(n*log(n)) based on insertion into redblack trees.
Sort

A collection of useful functions for sorting and comparing
characters, strings, and lists.
TableRBT

This library provides an efficient implementation of tables
(i.e., finite mappings from keys to values) as redblack trees.
The implementation is generic in the types of keys and values
and the table operations require an ordering predicate on keys.
Traversal

This library supports lightweight generic traversals through treestructured data.
Libraries for web applications:
CategorizedHtmlList

This library provides functions to categorize a list of entities
into a HTML page with an index access (e.g., "AZ") to these entities.
HTML

This library supports HTML and CGI programming, i.e.,
the generation of (dynamic) web pages. A detailed description
of this library and its basic ideas can be found
here.
HtmlParser

This library contains a parser for HTML documents.
It does not perform any syntax checks but returns
only a generic representation according to the definition of
HTML documents provided in the library
HTML
.
Mail

This library contains functions for sending emails.
The implementation might need to be adapted to the local environment.
Markdown

Library to translate markdown documents into HTML or LaTeX.
URL

This library contains functions related to URLs,
in particular, downloading of documents accessible by a URL.
WUI

Library to support typeoriented construction of web user interfaces.
The ideas behind the application and implementation of this library are
described in paper that is available via
this web page.
XML

Library for processing data in XML format.
It contains a definition of a datatype for representing
XML terms and a parser and pretty printing for converting
strings into such XML terms and vice versa.
XmlConv

This library provides typebased combinators to construct XML converters.
Arbitrary XML data can be represented as algebraic datatypes and vice versa.
See
here for a description of this library.
AbstractCurry

This library contains a definition for representing Curry programs
in Curry and an I/O action to read Curry programs and
transform them into this abstract representation.
AbstractCurryGoodies

This library provides some useful functions to write programs
that generate AbstractCurry programs more compact and readable.
AbstractCurryPrinter

This library contains a pretty printer for AbstractCurry programs
in order to show an AbstractCurry program in standard Curry syntax.
CompactFlatCurry

This library contains functions to reduce the size of FlatCurry programs
by combining the main module and all imports into a single program
that contains only the functions directly or indirectly called from
a set of main functions.
CurryStringClassifier

This library contains a simple tool to process strings containing
Curry source code in order to perform simple manipulations of source programs
(e.g., adding type signatures, removing comments).
FlatCurry

This library supports metaprogramming, i.e., the manipulation of
Curry programs in Curry. For this purpose, the library contains
definitions of datatypes for the representation of socalled
FlatCurry programs and an I/O action to read Curry programs
and transform them into this representation.
FlatCurryGoodies

This library provides selector functions, test and update operations
as well as some useful auxiliary functions for manipulating
FlatCurry data terms.
FlatCurryRead

This library defines operations to read a FlatCurry programs or interfaces
together with all its imported modules in the current load path.
FlatCurryShow

This library contains functions to transform FlatCurry programs
into string representations, either in a FlatCurry format
or in a Currylike syntax.
FlatCurryXML

This library contains functions to
convert FlatCurry programs into XML terms and vice versa.
FlexRigid

This library provides a function to compute the rigid/flex status
of a FlatCurry expression (righthand side of a function definition).
PrettyAbstract

This library contains a pretty printer for AbstractCurry programs
in order to show an AbstractCurry program in humanreadable Curry syntax.
In contrast to the library
AbstractCurryPrinter
,
this library implements a better humanreadable pretty printing
of AbstractCurry programs.