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((nil . ((eval . (add-hook 'before-save-hook 'copyright-update))))
(scheme-mode . ((tab-width . 2)
(indent-tabs-mode . t)
(geiser-scheme-implementation . guile))))

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### Autotools ###
Makefile.in
Makefile
# http://www.gnu.org/software/autoconf
autom4te.cache
/autoscan.log
/autoscan-*.log
/aclocal.m4
/compile
/config.gues
/config.h.in
/config.log
/config.status
/config.sub
/config.guess
/config.rpath
/configure
/config.scan
/depcomp
/install-sh
/missing
/stamp-h1
/stamp-h
/config.h
/ABOUT-NLS
/INSTALL
/timestamp
/AUTHORS
/ChangeLog
# Libtool.
/ltmain.sh
libtool
# temp files.
*~
# http://www.gnu.org/software/m4/
m4/build-to-host.m4
m4/gettext.m4
m4/host-cpu-c-abi.m4
m4/iconv.m4
m4/intlmacosx.m4
m4/lib-ld.m4
m4/lib-link.m4
m4/lib-prefix.m4
m4/libtool.m4
m4/lt~obsolete.m4
m4/ltoptions.m4
m4/ltsugar.m4
m4/ltversion.m4
m4/nls.m4
m4/po.m4
m4/progtest.m4
# Executables
*.go
# gettext autogenerated files.
po/*sed
po/*.header
po/*.sin
po/Rules-quot
po/Makevars.template
po/POTFILES
po/Makefile.in.in
*.pot

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GNU AFFERO GENERAL PUBLIC LICENSE
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<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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################################################################################
# Makefile.am
# Copyright (C) 2025 Cor Legemaat <cor@cor.za.net>
#
# This file is part of scheme-dql: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published by the
# Free Software Foundation, version 3 of the License.
# scheme-dql is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# scheme-dql. If not, see <https://www.gnu.org/licenses/>.
################################################################################
ACLOCAL_AMFLAGS=-I m4
SUBDIRS = po dql doc
dist_doc_DATA = \
README.org \
COPYING \
AUTHORS \
INSTALL \
NEWS
README: README.org
AUTHORS:
$(file >AUTHORS,$(shell git --no-pager shortlog -sn --email HEAD))
.PHONY: AUTHORS
ChangeLog:
$(file >ChangeLog,$(shell git log --oneline --graph))
.PHONY: ChangeLog
release-tag:
$(shell git tag -a "v$(VERSION)" -m "Release v$(VERSION)")
$(shell git push origin "v$(VERSION)")
live:
mkdir -p /usr/share/guile/site/dql
mount --bind -o ro dql /usr/share/guile/site/dql/
# Remove doc directory on uninstall
uninstall-local:
-rm -r $(docdir)
# End of Makefile.am

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* scheme-dql
A library that exposes an interface for processing data, written as a proof of
concept for fixing SQL syntax in the same sense as how [[https://synthcode.com/scheme/irregex/][irregex]] fixed regular
expression syntax in a scheme way.
The data is in lists of alists stored and read by the calling application in the same
way as how json is used. [[https://github.com/aconchillo/guile-json][guile-json]] could be used to convert to and from json data.
The interface is implemented thru a macro that will compile the query lambda in
the calling code. That function is then called to execute the query on the data.
The idea is to have this as an [[https://sqlite.org/index.html][SQLite]] for scheme but implemented like a header
only library in c/c++ via the macro. Most of the logic is done by calling a function
supplied in the query to keep it simple but powerful.
This is still alpha software, only used in [[https://www.gnu.org/software/guile/][guile]] and not fully tested. The purpose is
to determine how feasible a polish noted data query language could be.
** License
You can redistribute and/or modify [[https://www.cor.za.net/code/scheme-dql][scheme-dql]] under the terms of the GNU
Affero General Public License as published by the Free Software Foundation,
version 3 of the License. Please see =COPYING= file for the terms of GNU Affero
General Public License.
** query language
Each method consist of a list with the first atom a symbol for the method like in
scheme, the second parameter is either the return from a sub query or the
``implied'' data fed thru the function call.
The ~<key-path>~ is multiple string values to follow in order to reach the final
association that contain the data to use.
*** Methods
**** filter
#+begin_src scheme
(filter ;; other query or implied data.
(where <callback> <key-path>))
#+end_src
This will return only the alists that return a ~#true~ from the ~where~ method.
All the where clauses are passed true an ~and~ to the where sub method.
**** sort
#+begin_src scheme
(sort ;; other query or implied data.
(by <callback> <key-path>))
#+end_src
The ~<callback>~ should be a function with two parameters that return
~#true~ if the first parameter should be before the second parameter
~#false~ otherwise.
**** alter
#+begin_src scheme
(alter ;; other query or implied data.
(where <callback> <key-path>)
(insert <data> <key>)
(update <data> <key>)
(drop <key>))
#+end_src
~where~ will act as a filter for application but the returned data is the full
alist, if you want to filter the data use the ~filter~ method.
- ~insert~ will call ~acons~ on the alist.
- ~update~ will call ~assoc-set!~ on the alist.
- ~drop~ will call ~assoc-remove!~ on the alist.
**** select
#+begin_src scheme
(select ;; other query or implied data.
(parm <key-path>)
(parm-as <key> <key-path>)
(parm-val <key-path>))
#+end_src
- ~parm~ will return the association as is.
- ~parm-as~ will return an assosiation with the value represented by the
path but the key will be the ~<key>~ paramter.
- ~parm-val~ will return only the value represented by the path.
*** sub methods
**** where
#+begin_src scheme
(where <callback> <key-path>)
(where (and (where <callback> <key-path>)
(or (where <callback> <key-path>)
(where <callback> <key-path>))))
#+end_src
The ~<callback>~ should be a function with a single parameter that return
~#true~ if the data in the parameter passes the filter and ~#false~ otherwise.
Boolean ~and~ and ~or~ combinations are allowed.
*** example
#+begin_src scheme
(use-modules (dql dql))
(define my-filter
(lambda (val)
(if (string=? val "test") #t #f)))
((dql (select (filter (where my-filter "name"))
(parm "name")
(parm-as "date" "created_at"))
#:print-query "test-query")
data)
#+end_src
** extras
*** write to file
#+begin_src scheme
(dql-write <data> <file-path>)
#+end_src
*** read from file
#+begin_src scheme
(dql-read <file-path>)
#+end_src

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define(SCHEME_DQL_CONFIGURE_COPYRIGHT, [[
Copyright (C) 2025 Cor Legemaat <cor@cor.za.net>
All Rights Reserved
This file is part of scheme-dql: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published by the
Free Software Foundation, version 3 of the License.
scheme-dql is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
scheme-dql. If not, see <https://www.gnu.org/licenses/>.
]])
m4_define([version_major], [0])
m4_define([version_minor], [0])
m4_define([version_revision], [0])
AC_PACKAGE_URL([http://www.cor.za.net/code/scheme-dql])
AC_INIT(scheme-dql,
[version_major.version_minor.version_revision],
[mailto:cor@cor.za.net],
[],
[http://www.cor.za.net/code/scheme-dql])
AC_COPYRIGHT(SCHEME_DQL_CONFIGURE_COPYRIGHT)
AM_INIT_AUTOMAKE([1.16 gnu])
AC_CONFIG_MACRO_DIR([m4])
dnl ****************************************************************************
dnl Add version detail to config.h and makefile.am
dnl ****************************************************************************
AC_DEFINE([VERSION_MAJOR], [version_major], [Major section of version])
AC_DEFINE([VERSION_MINOR], [version_minor], [Minor section of version])
AC_DEFINE([VERSION_REVISION], [version_revision], [Revision section of version])
dnl Push version detail to makefile.am
VERSION=[version_major.version_minor.version_revision]
AC_SUBST(VERSION,[version_major.version_minor.version_revision])
VERSION_MAJOR=[version_major]
AC_SUBST(VERSION_MAJOR,[version_major])
VERSION_MINOR=[version_minor]
AC_SUBST(VERSION_MINOR,[version_minor])
VERSION_REVISION=[version_revision]
AC_SUBST(VERSION_REVISION,[version_revision])
dnl ****************************************************************************
dnl Check for the required guile dependency's.
dnl ****************************************************************************
m4_pattern_forbid([^GUILE_PKG$])
m4_pattern_forbid([^GUILE_PROGS$])
GUILE_PKG([3.0 2.0 2.2])
GUILE_PROGS
GUILE_FLAGS
GUILE_SITE_DIR
GUILE_MODULE_REQUIRED([srfi srfi-1])
GUILE_MODULE_REQUIRED([ice-9 pretty-print])
GUILE_MODULE_REQUIRED([ice-9 optargs])
GUILE_MODULE_REQUIRED([oop goops])
dnl Guile prefix and libdir.
GUILE_PREFIX=`$PKG_CONFIG --print-errors --variable=prefix guile-$GUILE_EFFECTIVE_VERSION`
GUILE_LIBDIR=`$PKG_CONFIG --print-errors --variable=libdir guile-$GUILE_EFFECTIVE_VERSION`
AC_SUBST(GUILE_PREFIX)
AC_SUBST(GUILE_LIBDIR)
if test "$cross_compiling" != no; then
GUILE_TARGET="--target=$host_alias"
AC_SUBST([GUILE_TARGET])
fi
dnl ***************************************************************************
dnl Internationalization
dnl ***************************************************************************
AM_GNU_GETTEXT_REQUIRE_VERSION(0.20)
dnl AM_GNU_GETTEXT_VERSION(0.20)
AM_GNU_GETTEXT([external])
dnl ***************************************************************************
AM_EXTRA_RECURSIVE_TARGETS([doc])
AC_CONFIG_FILES([Makefile
po/Makefile.in
dql/Makefile
doc/Makefile])
AC_CONFIG_COMMANDS([timestamp], [date >timestamp])
AC_OUTPUT
# End the configure script.

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################################################################################
# Makefile.am
# Copyright (C) 2025 Cor Legemaat <cor@cor.za.net>
#
# This file is part of scheme-dql: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published by the
# Free Software Foundation, version 3 of the License.
# scheme-dql is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# scheme-dql. If not, see <https://www.gnu.org/licenses/>.
################################################################################
moddir=$(datadir)/guile/site/$(GUILE_EFFECTIVE_VERSION)/dql
objdir=$(libdir)/guile/$(GUILE_EFFECTIVE_VERSION)/site-ccache/dql
SOURCES = dql.scm
GOBJECTS = $(SOURCES:%.scm=%.go)
nobase_mod_DATA = $(SOURCES) $(NOCOMP_SOURCES)
nobase_obj_DATA = $(GOBJECTS)
# Make sure source files are installed first, so that the mtime of
# installed compiled files is greater than that of installed source
# files. See
# <http://lists.gnu.org/archive/html/guile-devel/2010-07/msg00125.html>
# for details.
guile_install_obj_files = install-nobase_obj_DATA
$(guile_install_obj_files): install-nobase_mod_DATA
EXTRA_DIST = $(SOURCES) $(NOCOMP_SOURCES)
CLEANFILES = $(GOBJECTS)
GUILE_WARNINGS = -Wunbound-variable -Warity-mismatch -Wformat
GUILE_OPTS = -L $(abs_top_builddir)/src
SUFFIXES = .scm .go
.scm.go:
$(GUILD) compile $(GUILE_TARGET) $(GUILE_OPTS) $(GUILE_WARNINGS) -o "$@" "$<"

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;; -*- Mode: Scheme; geiser-scheme-implementation: guile; tab-width: 2 -*-
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; dql.scm
;;; Copyright (C) 2025 Cor Legemaat <cor@cor.za.net>
;;;
;;; This file is part of scheme-dql: you can redistribute it and/or modify it
;;; under the terms of the GNU Affero General Public License as published by the
;;; Free Software Foundation, version 3 of the License.
;;;
;;; scheme-dql is distributed in the hope that it will be useful, but WITHOUT
;;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
;;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
;;; more details.
;;;
;;; You should have received a copy of the GNU General Public License along with
;;; scheme-dql. If not, see <https://www.gnu.org/licenses/>.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
#|
This module creates an interface for processing alist data in the same sense as
how sqlite is used for processing data. The data is in alists stored and read
by the calling application in the same way as how json is used. The querry
syntax is fixed from SQL like how irregex fixed regular expressions.
|#
;; TODO move non public functions to sub modules and generate api documentation
;; for this module with https://luis-felipe.gitlab.io/guile-documenta/.
(define-module (dql dql)
#:use-module (srfi srfi-1)
#:use-module (ice-9 pretty-print)
#:use-module (ice-9 optargs)
#:use-module (oop goops))
(define-public alist?
(lambda (test-list)
"Check if the test data is an alist with the keys as strings.
@strong{test-list} (list):
The data to check.
@strong{return} (bool):
True if the test data is an alist with the keys as strings, false
otherwise."
(if (pair? test-list)
(every (lambda (ass)
(if (pair? ass)
(or (string? (car ass))
(symbol? (car ass)))
#f))
test-list)
#f)))
(define path-val
(lambda (path data)
"Return the code that can determine the last key of the path, where the path
forms a list of keys with each following key is read from the data of the
preceding key.
@strong{path} (list):
A list of key strings in the sequence as how you should traverse the
data to get to the value.
@strong{data} (alist):
The a-list data tree to retrieve the value from.
@strong{return} (any):
The value stored by the last key in the path."
(if (null? (cdr path))
`(assoc-ref ,data ,(car path))
(path-val (cdr path)
`(assoc-ref ,data ,(car path))))))
(define-public dql-data->list
(lambda (data)
"Function to convert the supplied data into a list of alists from a non
list like a vector that could be represented as a list of alists or ill
formatted data.
@strong{data} (any data type that could be represented as a list):
The source data to convert.
@strong{return} (list of alists):
The input data converted to a list of alists.
Only vectors and ill formatted lists of alists are supported at the moment
but more could be added like arrays etc."
(cond ((vector? data)
(vector->list data))
((list? data)
(cond ((and (pair? data) (pair? (car data)) (null? (cdr data))
(pair? (car data)) (pair? (caar data)) (null? (cdar data)))
;;Hack to handle nestling of answers.
(caar data))
((alist? data)
;;Hack for if alist no inside list.
(list data))
(else data)))
(else (error (string-append "Data not a list but \""
(object->string (class-of data))
"\"!\n"))))))
(define map-query-symbols
(lambda (query data)
"Function to map the querry keywords to their representative functions.
@strong{query} (dql-querry):
The querry to map.
@strong{data} (symbol)
The symbol representing the data.
@strong(return) (function call):
The call to the correct function.
Only the first symbol is used to determine what function to apply the
function handle it from there and will call this function again if needed."
(cond ((eq? (car query) 'filter)
(dql-filter (cdr query) data))
((eq? (car query) 'select)
(dql-select (cdr query) data))
((eq? (car query) 'sort)
(dql-sort (cdr query) data))
((eq? (car query) 'alter)
(dql-alter (cdr query) data))
(else (error (string-append "ERROR: Unimplemented query \""
(object->string (car query))
"\"!"))))))
(define first-parm-other
(lambda (parms . local)
"Function to determine if the first parameter is a local parameter or an
sub querry that will supply the data for this query.
@strong{parms} (dql-query):
The query to analyze.
@strong{local} (symbols):
The function local symbols that define local parameters.
@strong{return} (bool):
True if the first parameter is a sub query false otherwise."
(and (pair? parms)
(pair? (car parms))
(not (any (lambda (parm)
(eq? (caar parms) parm))
local)))))
(define dql-boolean-where
(lambda (bool-op filters entry)
"Function to return the code that can determine if the data processed by the
code should be selected for processing or not.
@strong{bool-op} (symbol):
The boolean operation to use for multiple selections.
@strong{filters} (filter list):
The list of callback filters for this query.
@strong{entry} (symbol)
The symbol representing the data entry.
@strong{return} (code):
The code that will analyze the data.
A filter is in the form of @code{(where <callback> <key> <key-n>)} where the
keys are passed as is to @ref(path-val) and the return from that as the data
to the callback function.
A boolean keyword like @samp{and} or @samp{or} will result in a tail call
with the rest of the entries as filters."
(if (or (eq? bool-op 'and)
(eq? bool-op 'or))
(append (list bool-op)
(map (lambda (rule)
(if (eq? (car rule) 'where)
`(,(cadr rule) ,(path-val (cddr rule)
entry))
(dql-boolean-where (car rule)
(cdr rule)
entry)))
filters))
(error (string-append "Unimplemented boolean operand \""
(symbol->string bool-op)
"\" for where!")))))
(define dql-filter
(lambda (query data)
"Function to return the code that will filter the data entries based on the
@xref{where, dql-boolean-where} rules of the query.
@strong{query} (dql-query):
The query to generate the code for.
@strong{data} (symbol)
The symbol representing the data.
@strong{return} (code):
The code that will process the data according to the query."
(let ((fpo (first-parm-other query 'where 'and 'or))
(entry (gensym)))
`(filter-map (lambda (,entry)
(if ,(dql-boolean-where 'and
(if fpo
(cdr query)
query)
entry)
,entry #f))
(dql-data->list ,(if fpo
(map-query-symbols (car query)
data)
data))))))
(define dql-sort
(lambda (query data)
"Function to return the code that will sort the data entries based on the
@code{by} rules of the query.
@strong{query} (dql-query):
The query to generate the code for.
@strong{data} (symbol)
The symbol representing the data.
@strong{return} (code):
The code that will process the data according to the query."
(let ((fpo (first-parm-other query 'by)))
(let ((first-parm (if fpo
(cadr query)
(car query)))
(a (gensym))
(b (gensym)))
`(sort (dql->data->list ,(if fpo
(map-query-symbols (car query)
data)
(if (null? (cdr query))
data
`(dql-sort ,(cdr query)))))
(lambda (,a ,b)
,((cadr first-parm)
(path-val (cddr first-parm) a)
(path-val (cddr first-parm) b))))))))
(define dql-alter
(lambda (query data)
"Function to return the code that will alter the data entries based on the
@xref{where, dql-boolean-where} filter as the first rule and then the
subsequent @code{insert}, @code{update} and @code{drop} rules of the query.
@strong{query} (dql-query):
The query to generate the code for.
@strong{data} (symbol)
The symbol representing the data.
@strong{return} (code):
The code that will process the data according to the query."
(let* ((fpo (first-parm-other query 'insert 'update 'drop 'where))
(entry (gensym))
(parm->code
(lambda (parm)
;;TODO get entry from path-val.
(cond ((eq? (car parm) 'update)
`(set! ,entry
(assoc-set! ,entry ,(second parm) ,(third parm))))
((eq? (car parm) 'insert)
`(set! ,entry
(acons ,(second parm) ,(third parm) ,entry)))
((eq? (car parm) 'drop)
`(set! ,entry
(assoc-remove! ,entry
,(second parm))))
(else (error (string-append "Illegal parameter \""
(symbol->string (car parm))
"\" for alter")))))))
`(map ,(append (list 'lambda (list entry))
(list (append (list 'if
(if fpo
(if (first-parm-other (cdr query)
'where)
#t
(dql-boolean-where 'where
(cadr query)
entry))
(if (first-parm-other query 'where)
#t
(dql-boolean-where 'where
(car query)
entry))))
(list (append (list 'begin)
(map parm->code
(if fpo
(cdr query)
query))))))
(list entry))
(dql-data->list ,(if fpo
(map-query-symbols (car query) data)
data))))))
(define dql-select
(lambda (query data)
"Function to return the code that will select a subsections of the
associations of the alist data entries based on the @code{parm},
@code{parm-as} and @code{parm-val} rules of the query.
@strong{query} (dql-query):
The query to generate the code for.
@strong{data} (symbol)
The symbol representing the data.
@strong{return} (code):
The code that will process the data according to the query."
(let* ((fpo (first-parm-other query 'parm 'parm-as 'parm-val))
(entry (gensym))
(parm->code
(lambda (parm)
(cond ((eq? (car parm) 'parm)
(let ((last-parm (last parm))
(rest-parms (drop-right (cdr parm) 1)))
`(assoc ,last-parm
,(if (null? rest-parms)
entry
(path-val rest-parms
entry)))))
((eq? (car parm) 'parm-as)
`(cons ,(car (cdr parm))
,(path-val (cdr (cdr parm))
entry)))
((eq? (car parm) 'parm-val)
(let ((last-parm (last parm))
(rest-parms (drop-right (cdr parm) 1)))
`(assoc-ref ,(if (null? rest-parms)
entry
(path-val rest-parms
entry))
,last-parm)))
(else
(error "Illegal parameter for select."))))))
`(map (lambda (,entry)
,(append (list 'list)
(map parm->code
(if fpo (cdr query) query))))
(dql-data->list ,(if fpo
(map-query-symbols (car query) data)
data))))))
(defmacro*-public dql (query #:key (print-query #f))
"The main exported macro to return the lambda that will process the data
based on the query.
@strong{query} (dql-query):
The query to generate the code for.
@strong{print-query} (boolean)
Option to @code{pretty-print} the generated lambda's code.
@strong{return} (lambda):
The lambda function that will process the data according to the query."
(let ((data (gensym)))
(if print-query
(begin (display "generated query for ")
(display print-query)
(display ":")
(newline)
(pretty-print `(lambda (,data)
,(map-query-symbols query data)))))
`(lambda (,data)
,(map-query-symbols query data))))
(define-public dql-write
(lambda (data path)
"A helper procedure to write the data to a file.
@strong{data} (alist-data):
The data to write to the file.
@strong{path} (string):
The file path to write the data to.
@strong{return} (undefined):"
(let ((output-port (open-output-file path)))
(pretty-print data output-port
#:display? #f
#:width 600
#:max-expr-width 600)
(close output-port))))
(define-public dql-read
(lambda (path)
"A helper function to read data from a file.
@strong{path} (string):
The file path to read the data from.
@strong{return} (alist-data):
The data read from the file."
(let* ((input-port (open-input-file path))
(data (read input-port)))
(close input-port)
data)))

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2025-06-21 gettextize <bug-gnu-gettext@gnu.org>
* POTFILES.in: New file.

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# Makefile variables for PO directory in any package using GNU gettext.
#
# Copyright (C) 2003-2019 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation gives
# unlimited permission to use, copy, distribute, and modify it.
# Usually the message domain is the same as the package name.
DOMAIN = $(PACKAGE)
# These two variables depend on the location of this directory.
subdir = po
top_builddir = ..
# These options get passed to xgettext.
XGETTEXT_OPTIONS = --keyword=_ --keyword=N_
# This is the copyright holder that gets inserted into the header of the
# $(DOMAIN).pot file. Set this to the copyright holder of the surrounding
# package. (Note that the msgstr strings, extracted from the package's
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# expected to transfer the copyright for their translations to this person
# or entity, or to disclaim their copyright. The empty string stands for
# the public domain; in this case the translators are expected to disclaim
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COPYRIGHT_HOLDER = Free Software Foundation, Inc.
# This tells whether or not to prepend "GNU " prefix to the package
# name that gets inserted into the header of the $(DOMAIN).pot file.
# Possible values are "yes", "no", or empty. If it is empty, try to
# detect it automatically by scanning the files in $(top_srcdir) for
# "GNU packagename" string.
PACKAGE_GNU =
# This is the email address or URL to which the translators shall report
# bugs in the untranslated strings:
# - Strings which are not entire sentences, see the maintainer guidelines
# in the GNU gettext documentation, section 'Preparing Strings'.
# - Strings which use unclear terms or require additional context to be
# understood.
# - Strings which make invalid assumptions about notation of date, time or
# money.
# - Pluralisation problems.
# - Incorrect English spelling.
# - Incorrect formatting.
# It can be your email address, or a mailing list address where translators
# can write to without being subscribed, or the URL of a web page through
# which the translators can contact you.
MSGID_BUGS_ADDRESS =
# This is the list of locale categories, beyond LC_MESSAGES, for which the
# message catalogs shall be used. It is usually empty.
EXTRA_LOCALE_CATEGORIES =
# This tells whether the $(DOMAIN).pot file contains messages with an 'msgctxt'
# context. Possible values are "yes" and "no". Set this to yes if the
# package uses functions taking also a message context, like pgettext(), or
# if in $(XGETTEXT_OPTIONS) you define keywords with a context argument.
USE_MSGCTXT = no
# These options get passed to msgmerge.
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MSGMERGE_OPTIONS =
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# the POT file is checked in the repository and the version control
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# "no". Set this to no if the POT file and PO files are maintained
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DIST_DEPENDS_ON_UPDATE_PO = yes

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# List of source files which contain translatable strings.

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################################################################################
# Makefile.am
# Copyright (C) 2025 Cor Legemaat <cor@cor.za.net>
#
# This file is part of scheme-dql: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published by the
# Free Software Foundation, version 3 of the License.
# scheme-dql is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# scheme-dql. If not, see <https://www.gnu.org/licenses/>.
################################################################################
moddir=$(datadir)/guile/site/$(GUILE_EFFECTIVE_VERSION)/dql
objdir=$(libdir)/guile/$(GUILE_EFFECTIVE_VERSION)/site-ccache/dql
SOURCES = dql.scm
GOBJECTS = $(SOURCES:%.scm=%.go)
nobase_mod_DATA = $(SOURCES) $(NOCOMP_SOURCES)
nobase_obj_DATA = $(GOBJECTS)
# Make sure source files are installed first, so that the mtime of
# installed compiled files is greater than that of installed source
# files. See
# <http://lists.gnu.org/archive/html/guile-devel/2010-07/msg00125.html>
# for details.
guile_install_obj_files = install-nobase_obj_DATA
$(guile_install_obj_files): install-nobase_mod_DATA
EXTRA_DIST = $(SOURCES) $(NOCOMP_SOURCES)
CLEANFILES = $(GOBJECTS)
GUILE_WARNINGS = -Wunbound-variable -Warity-mismatch -Wformat
GUILE_OPTS = -L $(abs_top_builddir)/src
SUFFIXES = .scm .go
.scm.go:
$(GUILD) compile $(GUILE_TARGET) $(GUILE_OPTS) $(GUILE_WARNINGS) -o "$@" "$<"

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;; -*- Mode: Scheme; geiser-scheme-implementation: guile; tab-width: 2 -*-
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; dql.scm
;;; Copyright (C) 2025 Cor Legemaat <cor@cor.za.net>
;;;
;;; This file is part of scheme-dql: you can redistribute it and/or modify it
;;; under the terms of the GNU Affero General Public License as published by the
;;; Free Software Foundation, version 3 of the License.
;;;
;;; scheme-dql is distributed in the hope that it will be useful, but WITHOUT
;;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
;;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
;;; more details.
;;;
;;; You should have received a copy of the GNU General Public License along with
;;; scheme-dql. If not, see <https://www.gnu.org/licenses/>.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
#|
This module creates an interface for processing alist data in the same sense as
how sqlite is used for processing data. The data is in alists stored and read
by the calling application in the same way as how json is used. The querry
syntax is fixed from SQL like how irregex fixed regular expressions.
|#
;; TODO move non public functions to sub modules and generate api documentation
;; for this module with https://luis-felipe.gitlab.io/guile-documenta/.
(define-module (dql dql)
#:use-module (srfi srfi-1)
#:use-module (ice-9 pretty-print)
#:use-module (ice-9 optargs)
#:use-module (oop goops))
(define-public alist?
(lambda (test-list)
"Check if the test data is an alist with the keys as strings.
@strong{test-list} (list):
The data to check.
@strong{return} (bool):
True if the test data is an alist with the keys as strings, false
otherwise."
(if (pair? test-list)
(every (lambda (ass)
(if (pair? ass)
(or (string? (car ass))
(symbol? (car ass)))
#f))
test-list)
#f)))
(define path-val
(lambda (path data)
"Return the code that can determine the last key of the path, where the path
forms a list of keys with each following key is read from the data of the
preceding key.
@strong{path} (list):
A list of key strings in the sequence as how you should traverse the
data to get to the value.
@strong{data} (alist):
The a-list data tree to retrieve the value from.
@strong{return} (any):
The value stored by the last key in the path."
(if (null? (cdr path))
`(assoc-ref ,data ,(car path))
(path-val (cdr path)
`(assoc-ref ,data ,(car path))))))
(define-public dql-data->list
(lambda (data)
"Function to convert the supplied data into a list of alists from a non
list like a vector that could be represented as a list of alists or ill
formatted data.
@strong{data} (any data type that could be represented as a list):
The source data to convert.
@strong{return} (list of alists):
The input data converted to a list of alists.
Only vectors and ill formatted lists of alists are supported at the moment
but more could be added like arrays etc."
(cond ((vector? data)
(vector->list data))
((list? data)
(cond ((and (pair? data) (pair? (car data)) (null? (cdr data))
(pair? (car data)) (pair? (caar data)) (null? (cdar data)))
;;Hack to handle nestling of answers.
(caar data))
((alist? data)
;;Hack for if alist no inside list.
(list data))
(else data)))
(else (error (string-append "Data not a list but \""
(object->string (class-of data))
"\"!\n"))))))
(define map-query-symbols
(lambda (query data)
"Function to map the querry keywords to their representative functions.
@strong{query} (dql-querry):
The querry to map.
@strong{data} (symbol)
The symbol representing the data.
@strong(return) (function call):
The call to the correct function.
Only the first symbol is used to determine what function to apply the
function handle it from there and will call this function again if needed."
(cond ((eq? (car query) 'filter)
(dql-filter (cdr query) data))
((eq? (car query) 'select)
(dql-select (cdr query) data))
((eq? (car query) 'sort)
(dql-sort (cdr query) data))
((eq? (car query) 'alter)
(dql-alter (cdr query) data))
(else (error (string-append "ERROR: Unimplemented query \""
(object->string (car query))
"\"!"))))))
(define first-parm-other
(lambda (parms . local)
"Function to determine if the first parameter is a local parameter or an
sub querry that will supply the data for this query.
@strong{parms} (dql-query):
The query to analyze.
@strong{local} (symbols):
The function local symbols that define local parameters.
@strong{return} (bool):
True if the first parameter is a sub query false otherwise."
(and (pair? parms)
(pair? (car parms))
(not (any (lambda (parm)
(eq? (caar parms) parm))
local)))))
(define dql-boolean-where
(lambda (bool-op filters entry)
"Function to return the code that can determine if the data processed by the
code should be selected for processing or not.
@strong{bool-op} (symbol):
The boolean operation to use for multiple selections.
@strong{filters} (filter list):
The list of callback filters for this query.
@strong{entry} (symbol)
The symbol representing the data entry.
@strong{return} (code):
The code that will analyze the data.
A filter is in the form of @code{(where <callback> <key> <key-n>)} where the
keys are passed as is to @ref(path-val) and the return from that as the data
to the callback function.
A boolean keyword like @samp{and} or @samp{or} will result in a tail call
with the rest of the entries as filters."
(if (or (eq? bool-op 'and)
(eq? bool-op 'or))
(append (list bool-op)
(map (lambda (rule)
(if (eq? (car rule) 'where)
`(,(cadr rule) ,(path-val (cddr rule)
entry))
(dql-boolean-where (car rule)
(cdr rule)
entry)))
filters))
(error (string-append "Unimplemented boolean operand \""
(symbol->string bool-op)
"\" for where!")))))
(define dql-filter
(lambda (query data)
"Function to return the code that will filter the data entries based on the
@xref{where, dql-boolean-where} rules of the query.
@strong{query} (dql-query):
The query to generate the code for.
@strong{data} (symbol)
The symbol representing the data.
@strong{return} (code):
The code that will process the data according to the query."
(let ((fpo (first-parm-other query 'where 'and 'or))
(entry (gensym)))
`(filter-map (lambda (,entry)
(if ,(dql-boolean-where 'and
(if fpo
(cdr query)
query)
entry)
,entry #f))
(dql-data->list ,(if fpo
(map-query-symbols (car query)
data)
data))))))
(define dql-sort
(lambda (query data)
"Function to return the code that will sort the data entries based on the
@code{by} rules of the query.
@strong{query} (dql-query):
The query to generate the code for.
@strong{data} (symbol)
The symbol representing the data.
@strong{return} (code):
The code that will process the data according to the query."
(let ((fpo (first-parm-other query 'by)))
(let ((first-parm (if fpo
(cadr query)
(car query)))
(a (gensym))
(b (gensym)))
`(sort (dql->data->list ,(if fpo
(map-query-symbols (car query)
data)
(if (null? (cdr query))
data
`(dql-sort ,(cdr query)))))
(lambda (,a ,b)
,((cadr first-parm)
(path-val (cddr first-parm) a)
(path-val (cddr first-parm) b))))))))
(define dql-alter
(lambda (query data)
"Function to return the code that will alter the data entries based on the
@xref{where, dql-boolean-where} filter as the first rule and then the
subsequent @code{insert}, @code{update} and @code{drop} rules of the query.
@strong{query} (dql-query):
The query to generate the code for.
@strong{data} (symbol)
The symbol representing the data.
@strong{return} (code):
The code that will process the data according to the query."
(let* ((fpo (first-parm-other query 'insert 'update 'drop 'where))
(entry (gensym))
(parm->code
(lambda (parm)
;;TODO get entry from path-val.
(cond ((eq? (car parm) 'update)
`(set! ,entry
(assoc-set! ,entry ,(second parm) ,(third parm))))
((eq? (car parm) 'insert)
`(set! ,entry
(acons ,(second parm) ,(third parm) ,entry)))
((eq? (car parm) 'drop)
`(set! ,entry
(assoc-remove! ,entry
,(second parm))))
(else (error (string-append "Illegal parameter \""
(symbol->string (car parm))
"\" for alter")))))))
`(map ,(append (list 'lambda (list entry))
(list (append (list 'if
(if fpo
(if (first-parm-other (cdr query)
'where)
#t
(dql-boolean-where 'where
(cadr query)
entry))
(if (first-parm-other query 'where)
#t
(dql-boolean-where 'where
(car query)
entry))))
(list (append (list 'begin)
(map parm->code
(if fpo
(cdr query)
query))))))
(list entry))
(dql-data->list ,(if fpo
(map-query-symbols (car query) data)
data))))))
(define dql-select
(lambda (query data)
"Function to return the code that will select a subsections of the
associations of the alist data entries based on the @code{parm},
@code{parm-as} and @code{parm-val} rules of the query.
@strong{query} (dql-query):
The query to generate the code for.
@strong{data} (symbol)
The symbol representing the data.
@strong{return} (code):
The code that will process the data according to the query."
(let* ((fpo (first-parm-other query 'parm 'parm-as 'parm-val))
(entry (gensym))
(parm->code
(lambda (parm)
(cond ((eq? (car parm) 'parm)
(let ((last-parm (last parm))
(rest-parms (drop-right (cdr parm) 1)))
`(assoc ,last-parm
,(if (null? rest-parms)
entry
(path-val rest-parms
entry)))))
((eq? (car parm) 'parm-as)
`(cons ,(car (cdr parm))
,(path-val (cdr (cdr parm))
entry)))
((eq? (car parm) 'parm-val)
(let ((last-parm (last parm))
(rest-parms (drop-right (cdr parm) 1)))
`(assoc-ref ,(if (null? rest-parms)
entry
(path-val rest-parms
entry))
,last-parm)))
(else
(error "Illegal parameter for select."))))))
`(map (lambda (,entry)
,(append (list 'list)
(map parm->code
(if fpo (cdr query) query))))
(dql-data->list ,(if fpo
(map-query-symbols (car query) data)
data))))))
(defmacro*-public dql (query #:key (print-query #f))
"The main exported macro to return the lambda that will process the data
based on the query.
@strong{query} (dql-query):
The query to generate the code for.
@strong{print-query} (boolean)
Option to @code{pretty-print} the generated lambda's code.
@strong{return} (lambda):
The lambda function that will process the data according to the query."
(let ((data (gensym)))
(if print-query
(begin (display "generated query for ")
(display print-query)
(display ":")
(newline)
(pretty-print `(lambda (,data)
,(map-query-symbols query data)))))
`(lambda (,data)
,(map-query-symbols query data))))
(define-public dql-write
(lambda (data path)
"A helper procedure to write the data to a file.
@strong{data} (alist-data):
The data to write to the file.
@strong{path} (string):
The file path to write the data to.
@strong{return} (undefined):"
(let ((output-port (open-output-file path)))
(pretty-print data output-port
#:display? #f
#:width 600
#:max-expr-width 600)
(close output-port))))
(define-public dql-read
(lambda (path)
"A helper function to read data from a file.
@strong{path} (string):
The file path to read the data from.
@strong{return} (alist-data):
The data read from the file."
(let* ((input-port (open-input-file path))
(data (read input-port)))
(close input-port)
data)))