219 lines
9.4 KiB
EmacsLisp
219 lines
9.4 KiB
EmacsLisp
;;; org-babel-ref.el --- org-babel functions for referencing external data
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;; Copyright (C) 2009 Eric Schulte, Dan Davison
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;; Author: Eric Schulte, Dan Davison
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;; Keywords: literate programming, reproducible research
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;; Homepage: http://orgmode.org
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;; Version: 0.01
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;;; License:
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3, or (at your option)
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;; any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;; Functions for referencing data from the header arguments of a
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;; org-babel block. The syntax of such a reference should be
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;;
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;; #+VAR: variable-name=file:resource-id
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;;
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;; - variable-name :: the name of the variable to which the value
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;; will be assigned
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;;
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;; - file :: path to the file containing the resource, or omitted if
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;; resource is in the current file
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;;
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;; - resource-id :: the id or name of the resource
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;;
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;; So an example of a simple src block referencing table data in the
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;; same file would be
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;;
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;; #+TBLNAME: sandbox
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;; | 1 | 2 | 3 |
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;; | 4 | org-babel | 6 |
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;;
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;; #+begin_src emacs-lisp :var table=sandbox
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;; (message table)
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;; #+end_src
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;;
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;;; Code:
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(require 'org-babel)
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(defun org-babel-ref-variables (params)
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"Takes a parameter alist, and return an alist of variable
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names, and the emacs-lisp representation of the related value."
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(let ((assignments
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(delq nil (mapcar (lambda (pair) (if (eq (car pair) :var) (cdr pair))) params)))
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(others
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(delq nil (mapcar (lambda (pair) (unless (eq :var (car pair)) pair)) params))))
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(mapcar (lambda (assignment) (org-babel-ref-parse assignment)) assignments)))
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(defvar org-babel-ref-split-regexp
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"[ \f\t\n\r\v]*\\(.+?\\)[ \f\t\n\r\v]*=[ \f\t\n\r\v]*\\(.+\\)[ \f\t\n\r\v]*")
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(defun org-babel-ref-parse (assignment &optional params)
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"Parse a variable ASSIGNMENT in a header argument. If the
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right hand side of the assignment has a literal value return that
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value, otherwise interpret as a reference to an external resource
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and find it's value using `org-babel-ref-resolve-reference'.
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Return a list with two elements. The first element of the list
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will be the name of the variable, and the second will be an
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emacs-lisp representation of the value of the variable."
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(if (string-match org-babel-ref-split-regexp assignment)
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(let ((var (match-string 1 assignment))
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(ref (match-string 2 assignment)))
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(cons (intern var)
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(or (org-babel-ref-literal ref)
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(org-babel-ref-resolve-reference ref params))))))
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(defun org-babel-ref-literal (ref)
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"Determine if the right side of a header argument variable
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assignment is a literal value or is a reference to some external
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resource. If REF is literal then return it's value, otherwise
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return nil."
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(let ((out (org-babel-read ref)))
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(if (equal out ref)
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(if (string-match "^\".+\"$" ref)
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(read ref))
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out)))
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(defun org-babel-ref-resolve-reference (ref &optional params)
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"Resolve the reference and return its value"
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(save-excursion
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(let ((case-fold-search t)
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type args new-refere new-referent result lob-info split-file split-ref
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index index-row index-col)
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;; if ref is indexed grab the indices -- beware nested indicies
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(when (and (string-match "\\[\\(.+\\)\\]" ref)
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(let ((str (substring ref 0 (match-beginning 0))))
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(= (count ?( str) (count ?) str))))
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(setq index (match-string 1 ref))
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(setq ref (substring ref 0 (match-beginning 0))))
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;; assign any arguments to pass to source block
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(when (string-match "^\\(.+?\\)\(\\(.*\\)\)$" ref)
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(setq new-refere (match-string 1 ref))
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(setq new-referent (match-string 2 ref))
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;; (message "new-refere=%S, new-referent=%S" new-refere new-referent) ;; debugging
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(when (> (length new-refere) 0)
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(if (> (length new-referent) 0)
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(setq args (mapcar (lambda (ref) (cons :var ref))
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(org-babel-ref-split-args new-referent))))
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;; (message "args=%S" args) ;; debugging
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(setq ref new-refere)))
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(when (string-match "^\\(.+\\):\\(.+\\)$" ref)
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(setq split-file (match-string 1 ref))
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(setq split-ref (match-string 2 ref))
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(find-file split-file) (setq ref split-ref))
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(goto-char (point-min))
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(if (let ((result_regexp (concat "^#\\+\\(TBLNAME\\|RESNAME\\|RESULTS\\):[ \t]*"
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(regexp-quote ref) "[ \t]*$"))
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(regexp (concat org-babel-source-name-regexp
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(regexp-quote ref) "\\(\(.*\)\\)?" "[ \t]*$")))
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;; goto ref in the current buffer
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(or (and (not args)
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(or (re-search-forward result_regexp nil t)
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(re-search-backward result_regexp nil t)))
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(re-search-forward regexp nil t)
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(re-search-backward regexp nil t)
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;; check the Library of Babel
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(setq lob-info (cdr (assoc (intern ref) org-babel-library-of-babel)))))
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(unless lob-info (goto-char (match-beginning 0)))
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;; ;; TODO: allow searching for names in other buffers
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;; (setq id-loc (org-id-find ref 'marker)
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;; buffer (marker-buffer id-loc)
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;; loc (marker-position id-loc))
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;; (move-marker id-loc nil)
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(progn (message (format "reference '%s' not found in this buffer" ref))
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(error (format "reference '%s' not found in this buffer" ref))))
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(if lob-info
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(setq type 'lob)
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(while (not (setq type (org-babel-ref-at-ref-p)))
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(forward-line 1)
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(beginning-of-line)
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(if (or (= (point) (point-min)) (= (point) (point-max)))
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(error "reference not found"))))
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(setq params (org-babel-merge-params params args '((:results . "silent"))))
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(setq result
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(case type
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('results-line (org-babel-read-result))
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('table (org-babel-read-table))
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('file (org-babel-read-file))
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('source-block (org-babel-execute-src-block nil nil params))
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('lob (org-babel-execute-src-block nil lob-info params))))
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(if (symbolp result)
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(format "%S" result)
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(if (and index (listp result))
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(org-babel-ref-index-list index result)
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result)))))
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(defun org-babel-ref-index-list (index lis)
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"Return the subset of LIS indexed by INDEX. If INDEX is
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separated by ,s then each PORTION is assumed to index into the
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next deepest nesting or dimension. A valid PORTION can consist
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of either an integer index, or two integers separated by a : in
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which case the entire range is returned."
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(if (string-match "^,?\\([^,]+\\)" index)
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(let ((length (length lis))
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(portion (match-string 1 index))
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(remainder (substring index (match-end 0))))
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(flet ((wrap (num) (if (< num 0) (+ length num) num))
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(open (lis) (if (and (listp lis) (= (length lis) 1)) (car lis) lis)))
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(open
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(mapcar
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(lambda (sub-lis) (org-babel-ref-index-list remainder sub-lis))
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(if (string-match "\\(\\([-[:digit:]]+\\):\\([-[:digit:]]+\\)\\|\*\\)"
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portion)
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(mapcar (lambda (n) (nth n lis))
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(apply 'number-sequence
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(if (match-string 2 portion)
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(list
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(wrap (string-to-number (match-string 2 portion)))
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(wrap (string-to-number (match-string 3 portion))))
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(list (wrap 0) (wrap -1)))))
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(list (nth (wrap (string-to-number portion)) lis)))))))
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lis))
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(defun org-babel-ref-split-args (arg-string)
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"Split ARG-STRING into top-level arguments of balanced parenthesis."
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(let ((index 0) (depth 0) (buffer "") holder return)
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;; crawl along string, splitting at any ","s which are on the top level
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(while (< index (length arg-string))
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(setq holder (substring arg-string index (+ 1 index)))
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(setq buffer (concat buffer holder))
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(setq index (+ 1 index))
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(cond
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((string= holder ",")
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(when (= depth 0)
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(setq return (reverse (cons (substring buffer 0 -1) return)))
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(setq buffer "")))
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((or (string= holder "(") (string= holder "[")) (setq depth (+ depth 1)))
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((or (string= holder ")") (string= holder "]")) (setq depth (- depth 1)))))
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(mapcar #'org-babel-trim (reverse (cons buffer return)))))
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(defun org-babel-ref-at-ref-p ()
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"Return the type of reference located at point or nil if none
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of the supported reference types are found. Supported reference
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types are tables and source blocks."
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(cond ((org-at-table-p) 'table)
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((looking-at "^#\\+BEGIN_SRC") 'source-block)
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((looking-at org-bracket-link-regexp) 'file)
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((looking-at org-babel-result-regexp) 'results-line)))
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(provide 'org-babel-ref)
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;;; org-babel-ref.el ends here
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