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;;; rt-liberation-compiler.el --- Emacs interface to RT -*- lexical-binding: t; -*-
;; Copyright (C) 2008-2021 Free Software Foundation, Inc.
;; Author: Yoni Rabkin <yrk@gnu.org>
;; Authors: Aaron S. Hawley <aaron.s.hawley@gmail.com>, John Sullivan <johnsu01@wjsullivan.net>
;; Maintainer: Yoni Rabkin <yrk@gnu.org>
;; Keywords: rt, tickets
;; url: http://www.nongnu.org/rtliber/
;; This file is a part of rt-liberation.
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU 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 General Public License for more details.
;;
;; You should have received a copy of the GNU General Public
;; License along with this program; if not, write to the Free
;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
;; MA 02111-1307, USA.
;;; Installation and Use:
;;
;; Detailed instructions for installation and use can be found in the
;; rt-liberation manual, in the doc/ directory of the distribution.
;;; History:
;;
;; Started near the end of 2008.
;;; Code:
(require 'cl-lib)
;;; ------------------------------------------------------------------
;;; variables and constants
;;; ------------------------------------------------------------------
(defvar rt-liber-content-string "Content LIKE"
"String representation of \"content\" query tag.")
(defvar rt-liber-subject-string "Subject LIKE"
"String representation of \"subject\" query tag.")
(defvar rt-liber-email-address-string "Requestor.EmailAddress LIKE"
"String representation of \"Requestor.EmailAddress\" query tag.")
(defvar rt-liber-content-not-string "Content NOT LIKE"
"String representation of \"content\" query tag.")
(defvar rt-liber-subject-not-string "Subject NOT LIKE"
"String representation of \"subject\" query tag.")
(defvar rt-liber-resolved-string "Resolved"
"String representation of \"resolved\" query tag.")
(defvar rt-liber-lastupdated-string "LastUpdated"
"String representation of \"lastupdated\" query tag.")
(defvar rt-liber-email-address-not-string "Requestor.EmailAddress NOT LIKE"
"String representation of \"Requestor.EmailAddress\" query tag.")
(defvar rt-liber-created-string "Created"
"String representation of \"created\" query tag.")
;;; --------------------------------------------------------
;;; TicketSQL compiler
;;; --------------------------------------------------------
(eval-and-compile ;; for use in macro `rt-liber-compile-query'
(defun rt-liber-bool-p (sym)
"Return t if SYM is a boolean operator, otherwise nil."
(member sym '(and or)))
(defun rt-liber-attrib-p (sym)
"Return t if SYM is a ticket attribute, otherwise nil."
(member sym '(id owner status subject content queue lastupdatedby
email-address)))
(defun rt-liber-time-p (sym)
"Return t if SYM is a temporal attribute, otherwise nil."
(member sym '(created lastupdated resolved)))
(defun rt-liber-negation-p (sym)
(member sym '(not)))
(defun rt-liber-reduce (op seq)
"Reduce-OP with SEQ to a string of \"s0 op s1 op s2..\"."
(if seq
(cl-reduce
#'(lambda (a b)
(format "%s %s %s" a op b))
seq)
""))
(defun rt-liber-make-interval (pred before after)
"Return a formatted TicketSQL interval.
PRED temporal attribute predicate.
BEFORE date before predicate.
AFTER date after predicate."
(when (string= before "") (setq before nil))
(when (string= after "") (setq after nil))
(concat
(if before (format "%s < '%s'" pred before) "")
(if (and before after) (format " AND ") "")
(if after (format "%s > '%s'" pred after) ""))))
(defmacro rt-liber-compile-query (query &optional n)
"Compile sexp-based QUERY into TicketSQL."
(cond ((null query) `"")
((stringp query) `,query)
((rt-liber-bool-p query) `,(upcase (format "%s" query)))
;; attribute (positive)
((and (rt-liber-attrib-p query)
(not n))
`,(cond ((equal query 'content) rt-liber-content-string)
((equal query 'subject) rt-liber-subject-string)
((equal query 'email-address) rt-liber-email-address-string)
(t (capitalize (format "%s =" query)))))
;; attribute (negation)
((and (rt-liber-attrib-p query)
n)
`,(cond ((equal query 'content) rt-liber-content-not-string)
((equal query 'subject) rt-liber-subject-not-string)
((equal query 'email-address) rt-liber-email-address-not-string)
(t (capitalize (format "%s !=" query)))))
;; time
((rt-liber-time-p query)
`,(cond ((equal query 'created) rt-liber-created-string)
((equal query 'lastupdated) rt-liber-lastupdated-string)
((equal query 'resolved) rt-liber-resolved-string)))
((and (listp query)
(rt-liber-time-p (car query)))
`(rt-liber-make-interval
(rt-liber-compile-query ,(car query))
(rt-liber-compile-query ,(cadr query))
(rt-liber-compile-query ,(caddr query))))
;; function (known at compile time?)
((and query
(listp query)
(not (rt-liber-bool-p (car query)))
(not (rt-liber-negation-p (car query)))
(functionp (car query)))
`(format "%s" ,query))
;; negation attribute pairs
((and (listp query)
(rt-liber-negation-p (car query))
(rt-liber-attrib-p (caadr query)))
`(format "%s '%s'"
(rt-liber-compile-query ,(caadr query) t) ; negate
(rt-liber-compile-query ,(cadadr query))))
;; attribute pairs
((and (listp query)
(rt-liber-attrib-p (car query)))
`(format "%s '%s'"
(rt-liber-compile-query ,(car query))
(rt-liber-compile-query ,(cadr query))))
;; splice boolean operators
((and (listp query)
(rt-liber-bool-p (car query)))
`(rt-liber-reduce (rt-liber-compile-query ,(car query))
(rt-liber-compile-query ,(cdr query))))
;; compound statements
((and (listp query)
(not (cdr query)))
`(list (rt-liber-compile-query ,(car query))))
((listp query)
`(append
(list (rt-liber-compile-query ,(car query)))
(rt-liber-compile-query ,(cdr query))))
;; free variable
((and query
(symbolp query))
`(format "%s" ,query))
(t (error "cannot compile query %s" query))))
(provide 'rt-liberation-compiler)
;;; rt-liberation-compiler.el ends here.
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