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;;; esxpath.el --- testing phase -*- lexical-binding: t -*-
;; Copyright (C) 2013 Evan Izaksonas-Smith
;; Author: Evan Izaksonas-Smith <tali713@rastafy>
;; Keywords: extensions, lisp
;; 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, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(require 'esxml)
;;probable call
(defmacro esxpath-transform (pathspec)
(pcase pathspec
(`(,(and keyword) (pred keywordp) . ,_)
(error "Keyword %s unhandled" keyword))
(`(,(and root (pred symbolp)) ,(and body (pred symbolp)))
`(if (eq ',root (car ,body)) (nthcdr 2 ,body)))
(`(,(and node (pred symbolp)) ,(and body (pred consp)))
`(remove-if-not (apply-partially 'esxpath-tag-p ',node)
(esxpath-transform ,body)))
(_ pathspec)))
(pp (macroexpand '(esxpath-transform (title (book (bookstore test-sheet))))))
(remove-if-not
(apply-partially 'esxpath-tag-p 'title)
(remove-if-not
(apply-partially 'esxpath-tag-p 'book)
(if
(eq 'bookstore
(car test-sheet))
(list test-sheet))))
;; (defun esxpath-child-p (child-node parent-node)
;; (find child-node (esxpath-get-children parent-node)))
;; (defun esxpath-descendent-p (descendent-node ancestor-node)
;; (or (esxpath-child-p descendent-node ancestor-node)
;; (let ((children (esxpath-get-children ancestor-node)))
;; (if children (every (apply-partially 'esxpath-descendent-p descendent-node)
;; children)))))
(defun esxpath-fill-missing-attributes (pathspec)
(pcase pathspec
(`(,key
,arg
,(and pathspec (pred consp)))
`(,key ,arg ,(esxpath-fill-missing-attributes pathspec)))
(`(,(and key (pred keywordp))
,(and pathspec (pred consp)))
`(,key ,(esxpath-fill-missing-attributes pathspec)))
(`(,key
,(and pathspec (pred consp)))
`(,key () ,(esxpath-fill-missing-attributes pathspec)))
(`(,key)
`(,key ()))
(_ pathspec)))
(defun esxpath-transform (pathspec)
`(lambda (esxml)
,(pcase-recur `(,(car (last pathspec))
(esxpath-select-root ',(first pathspec) esxml))
;; (`((:has-child ,pathspec) ,form) (esxpath-select-with-child ))
(`((,(and tag (pred symbolp))
,(and attrs (pred attrsp))
,pathspec)
,form)
(:recur pathspec `(esxpath-select-from-children ',tag ',attrs ,form)))
(`((,(and tag (pred symbolp))
,(and attrs (pred attrsp)))
,form)
`(esxpath-select-from-children ',tag ',attrs ,form))
(`(,pathspec ,form) `((pathspec ,pathspec) (form ,form))))))
(defmacro esxpath (pathspec)
(esxpath-transform (esxpath-fill-missing-attributes pathspec)))
(pp (macroexpand '(esxpath (bookstore (book)))))
(pp (esxpath-transform
(esxpath-fill-missing-attributes
'(bookstore (book (title ((price . "1.00"))))))
))
(funcall (esxpath (bookstore (book)))
test-sheet)
;; ABOVE HERE DISCARD
(defvar test-sheet
(sxml-to-esxml '(bookstore
(book
(title (@ (lang "eng")) "Harry Potter")
(price "29.99"))
(book
(title (@ (lang "eng")) "Learning XML")
(price "39.95")))))
(defmacro plambda (&rest pcases)
(declare (indent defun))
(let ((args (gensym "args")))
`(lambda (,args)
(pcase ,args ,@pcases))))
(defun esxpath-tag-p (tag esxml)
(and (consp esxml)
(eq tag (car esxml))))
(defvar test-sheet2
'(tag ((attr1 . "foo")
(attr2 . "bar")
(attr3 . "3"))))
(defun esxpath-attrs-match (test-attrs esxml)
(pcase-let ((`(,_ ,attrs . ,_) esxml))
(every (plambda
(`(,key . ,(pred stringp)) (equal (assoc-default key test-attrs)
(assoc-default key attrs)))
(`(,key . (,op ,n)) (funcall op
(string-to-number (assoc-default key attrs))
n))
(x (error "Unhandled attr: %s" x)))
test-attrs)))
(defun esxpath-match (tag test-attrs esxml)
(and (if tag (esxpath-tag-p tag esxml) t)
(if test-attrs (esxpath-attrs-match test-attrs esxml) t)))
(defun on-nodeset (function)
(lambda (node-set)
(apply 'append (mapcar function node-set))))
(defun esxpath-select-root (root attrs esxml)
"Returns the root node as a node-set if it matches ROOT.
ROOT is a symbol, the tag of the root node."
(if (esxpath-match root attrs esxml)
(list esxml)))
(ert-deftest esxpath-select-root ()
"testing select-root"
(should (equal (esxpath-select-root nil nil test-sheet)
'((bookstore nil
(book nil
(title
((lang . "eng"))
"Harry Potter")
(price nil "29.99"))
(book nil
(title
((lang . "eng"))
"Learning XML")
(price nil "39.95"))))))
(should (equal (esxpath-select-root 'bookstore nil test-sheet)
'((bookstore nil
(book nil
(title
((lang . "eng"))
"Harry Potter")
(price nil "29.99"))
(book nil
(title
((lang . "eng"))
"Learning XML")
(price nil "39.95"))))))
(should (equal (esxpath-select-root 'foo nil test-sheet)
nil)))
(defun esxpath-select (tag attrs node-set)
(remove-if-not (apply-partially 'esxpath-match tag attrs) node-set))
(defun esxpath-get-children (esxml)
(pcase esxml (`(,_ ,_ . ,body) body)))
(defalias 'esxpath-select-children (on-nodeset 'esxpath-get-children))
(defun esxpath-select-from-children (tag attrs node-set)
(esxpath-select tag attrs (esxpath-select-children node-set)))
(ert-deftest esxpath-select-from-children ()
(should (equal (esxpath-select-from-children 'book nil
(esxpath-select-root nil nil test-sheet))
'((book nil
(title
((lang . "eng"))
"Harry Potter")
(price nil "29.99"))
(book nil
(title
((lang . "eng"))
"Learning XML")
(price nil "39.95")))))
(should (equal (esxpath-select-from-children nil '((lang . "eng"))
(esxpath-select-from-children
'book nil
(esxpath-select-root nil nil test-sheet)))
'((title
((lang . "eng"))
"Harry Potter")
(title
((lang . "eng"))
"Learning XML")))))
(defun esxpath-has-child (pred node)
(and (member-if pred (esxpath-get-children node))
node))
(esxpath-has-child (apply-partially 'esxpath-match 'book nil)
test-sheet)
(defun esxpath-select-with-child (pred)
(lambda (node-set)
(remove-if-not (apply-partially 'esxpath-has-child pred)
node-set)))
(provide 'esxpath)
;;; esxpath.el ends here
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