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489 lines
20 KiB
EmacsLisp
489 lines
20 KiB
EmacsLisp
;;; ob-java.el --- org-babel functions for java evaluation -*- lexical-binding: t -*-
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;; Copyright (C) 2011-2021 Free Software Foundation, Inc.
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;; Authors: Eric Schulte
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;; Dan Davison
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;; Maintainer: Ian Martins <ianxm@jhu.edu>
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;; Keywords: literate programming, reproducible research
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;; Homepage: https://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs 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 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs 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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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Org-Babel support for evaluating java source code.
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;;; Code:
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(require 'ob)
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(defvar org-babel-tangle-lang-exts)
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(add-to-list 'org-babel-tangle-lang-exts '("java" . "java"))
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(defvar org-babel-temporary-directory) ; from ob-core
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(defvar org-babel-default-header-args:java '((:results . "output")
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(:dir . "."))
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"Default header args for java source blocks.
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The docs say functional mode should be the default [1], but
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ob-java didn't originally support functional mode, so we keep
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scripting mode as the default for now to maintain previous
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behavior.
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Most languages write tempfiles to babel's temporary directory,
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but ob-java originally had to write them to the current
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directory, so we keep that as the default behavior.
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[1] https://orgmode.org/manual/Results-of-Evaluation.html")
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(defconst org-babel-header-args:java '((imports . :any))
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"Java-specific header arguments.")
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(defcustom org-babel-java-command "java"
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"Name of the java command.
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May be either a command in the path, like java or an absolute
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path name, like /usr/local/bin/java. Parameters may be used,
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like java -verbose."
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:group 'org-babel
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:package-version '(Org . "9.5")
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:type 'string)
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(defcustom org-babel-java-compiler "javac"
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"Name of the java compiler.
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May be either a command in the path, like javac or an absolute
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path name, like /usr/local/bin/javac. Parameters may be used,
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like javac -verbose."
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:group 'org-babel
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:package-version '(Org . "9.5")
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:type 'string)
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(defcustom org-babel-java-hline-to "null"
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"Replace hlines in incoming tables with this when translating to java."
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:group 'org-babel
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:package-version '(Org . "9.5")
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:type 'string)
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(defcustom org-babel-java-null-to 'hline
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"Replace `null' in java tables with this before returning."
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:group 'org-babel
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:package-version '(Org . "9.5")
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:type 'symbol)
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(defconst org-babel-java--package-re (rx line-start (0+ space) "package"
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(1+ space) (group (1+ (in alnum ?_ ?.))) ; capture the package name
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(0+ space) ?\; line-end)
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"Regexp for the package statement.")
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(defconst org-babel-java--imports-re (rx line-start (0+ space) "import"
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(opt (1+ space) "static")
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(1+ space) (group (1+ (in alnum ?_ ?. ?*))) ; capture the fully qualified class name
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(0+ space) ?\; line-end)
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"Regexp for import statements.")
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(defconst org-babel-java--class-re (rx line-start (0+ space) (opt (seq "public" (1+ space)))
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"class" (1+ space)
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(group (1+ (in alnum ?_))) ; capture the class name
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(0+ space) ?{)
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"Regexp for the class declaration.")
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(defconst org-babel-java--main-re (rx line-start (0+ space) "public"
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(1+ space) "static"
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(1+ space) "void"
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(1+ space) "main"
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(0+ space) ?\(
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(0+ space) "String"
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(0+ space) (1+ (in alnum ?_ ?\[ ?\] space)) ; "[] args" or "args[]"
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(0+ space) ?\)
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(0+ space) (opt "throws" (1+ (in alnum ?_ ?, ?. space)))
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?{)
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"Regexp for the main method declaration.")
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(defconst org-babel-java--any-method-re (rx line-start
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(0+ space) (opt (seq (1+ alnum) (1+ space))) ; visibility
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(opt (seq "static" (1+ space))) ; binding
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(1+ (in alnum ?_ ?\[ ?\])) ; return type
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(1+ space) (1+ (in alnum ?_)) ; method name
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(0+ space) ?\(
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(0+ space) (0+ (in alnum ?_ ?\[ ?\] ?, space)) ; params
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(0+ space) ?\)
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(0+ space) (opt "throws" (1+ (in alnum ?_ ?, ?. space)))
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?{)
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"Regexp for any method.")
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(defconst org-babel-java--result-wrapper "\n public static String __toString(Object val) {
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if (val instanceof String) {
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return \"\\\"\" + val + \"\\\"\";
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} else if (val == null) {
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return \"null\";
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} else if (val.getClass().isArray()) {
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StringBuffer sb = new StringBuffer();
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Object[] vals = (Object[])val;
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sb.append(\"[\");
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for (int ii=0; ii<vals.length; ii++) {
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sb.append(__toString(vals[ii]));
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if (ii<vals.length-1)
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sb.append(\",\");
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}
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sb.append(\"]\");
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return sb.toString();
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} else if (val instanceof List) {
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StringBuffer sb = new StringBuffer();
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List vals = (List)val;
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sb.append(\"[\");
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for (int ii=0; ii<vals.size(); ii++) {
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sb.append(__toString(vals.get(ii)));
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if (ii<vals.size()-1)
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sb.append(\",\");
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}
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sb.append(\"]\");
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return sb.toString();
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} else {
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return String.valueOf(val);
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}
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}
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public static void main(String[] args) throws IOException {
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BufferedWriter output = new BufferedWriter(new FileWriter(\"%s\"));
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output.write(__toString(_main(args)));
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output.close();
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}"
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"Code to inject into a class so that we can capture the value it returns.
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This implementation was inspired by ob-python, although not as
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elegant. This modified the source block to write out the value
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it wants to return to a temporary file so that ob-java can read
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it back. The name of the temporary file to write must be
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replaced in this string.")
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(defun org-babel-execute:java (body params)
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"Execute a java source block with BODY code and PARAMS params."
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(let* (;; allow header overrides
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(org-babel-java-compiler
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(or (cdr (assq :javac params))
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org-babel-java-compiler))
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(org-babel-java-command
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(or (cdr (assq :java params))
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org-babel-java-command))
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;; if true, run from babel temp directory
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(run-from-temp (not (cdr (assq :dir params))))
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;; class and package
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(fullclassname (or (cdr (assq :classname params))
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(org-babel-java-find-classname body)))
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;; just the class name
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(classname (car (last (split-string fullclassname "\\."))))
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;; just the package name
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(packagename (if (string-match-p "\\." fullclassname)
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(file-name-base fullclassname)))
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;; the base dir that contains the top level package dir
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(basedir (file-name-as-directory (if run-from-temp
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(if (file-remote-p default-directory)
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(concat
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(file-remote-p default-directory)
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org-babel-remote-temporary-directory)
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org-babel-temporary-directory)
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default-directory)))
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;; the dir to write the source file
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(packagedir (if (and (not run-from-temp) packagename)
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(file-name-as-directory
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(concat basedir (replace-regexp-in-string "\\\." "/" packagename)))
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basedir))
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;; the filename of the source file
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(src-file (concat packagedir classname ".java"))
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;; compiler flags
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(cmpflag (or (cdr (assq :cmpflag params)) ""))
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;; runtime flags
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(cmdline (or (cdr (assq :cmdline params)) ""))
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;; command line args
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(cmdargs (or (cdr (assq :cmdargs params)) ""))
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;; the command to compile and run
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(cmd (concat org-babel-java-compiler " " cmpflag " "
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(org-babel-process-file-name src-file 'noquote)
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" && " org-babel-java-command
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" -cp " (org-babel-process-file-name basedir 'noquote)
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" " cmdline " " (if run-from-temp classname fullclassname)
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" " cmdargs))
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;; header args for result processing
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(result-type (cdr (assq :result-type params)))
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(result-params (cdr (assq :result-params params)))
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(result-file (and (eq result-type 'value)
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(org-babel-temp-file "java-")))
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;; the expanded body of the source block
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(full-body (org-babel-expand-body:java body params)))
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;; created package-name directories if missing
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(unless (or (not packagedir) (file-exists-p packagedir))
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(make-directory packagedir 'parents))
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;; write the source file
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(setq full-body (org-babel-java--expand-for-evaluation
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full-body run-from-temp result-type result-file))
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(with-temp-file src-file (insert full-body))
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;; compile, run, process result
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(org-babel-reassemble-table
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(org-babel-java-evaluate cmd result-type result-params result-file)
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(org-babel-pick-name
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(cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
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(org-babel-pick-name
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(cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
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;; helper functions
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(defun org-babel-java-find-classname (body)
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"Try to find fully qualified class name in BODY.
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Look through BODY for the package and class. If found, put them
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together into a fully qualified class name and return. Else just
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return class name. If that isn't found either, default to Main."
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(let ((package (if (string-match org-babel-java--package-re body)
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(match-string 1 body)))
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(class (if (string-match org-babel-java--class-re body)
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(match-string 1 body))))
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(or (and package class (concat package "." class))
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(and class class)
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(and package (concat package ".Main"))
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"Main")))
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(defun org-babel-java--expand-for-evaluation (body suppress-package-p result-type result-file)
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"Expand source block for evaluation.
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In order to return a value we have to add a __toString method.
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In order to prevent classes without main methods from erroring we
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add a dummy main method if one is not provided. These
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manipulations are done outside of `org-babel--expand-body' so
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that they are hidden from tangles.
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BODY is the file content before instrumentation.
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SUPPRESS-PACKAGE-P if true, suppress the package statement.
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RESULT-TYPE is taken from params.
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RESULT-FILE is the temp file to write the result."
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(with-temp-buffer
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(insert body)
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;; suppress package statement
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(goto-char (point-min))
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(when (and suppress-package-p
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(re-search-forward org-babel-java--package-re nil t))
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(replace-match ""))
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;; add a dummy main method if needed
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(goto-char (point-min))
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(when (not (re-search-forward org-babel-java--main-re nil t))
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(org-babel-java--move-past org-babel-java--class-re)
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(insert "\n public static void main(String[] args) {
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System.out.print(\"success\");
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}\n\n"))
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;; special handling to return value
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(when (eq result-type 'value)
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(goto-char (point-min))
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(org-babel-java--move-past org-babel-java--class-re)
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(insert (format org-babel-java--result-wrapper
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(org-babel-process-file-name result-file 'noquote)))
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(search-forward "public static void main(") ; rename existing main
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(replace-match "public static Object _main("))
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;; add imports
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(org-babel-java--import-maybe "java.util" "List")
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(org-babel-java--import-maybe "java.util" "Arrays")
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(org-babel-java--import-maybe "java.io" "BufferedWriter")
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(org-babel-java--import-maybe "java.io" "FileWriter")
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(org-babel-java--import-maybe "java.io" "IOException")
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(buffer-string)))
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(defun org-babel-java--move-past (re)
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"Move point past the first occurrence of the given regexp RE."
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(while (re-search-forward re nil t)
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(goto-char (1+ (match-end 0)))))
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(defun org-babel-java--import-maybe (package class)
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"Import from PACKAGE the given CLASS if it is used and not already imported."
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(let (class-found import-found)
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(goto-char (point-min))
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(setq class-found (re-search-forward class nil t))
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(goto-char (point-min))
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(setq import-found
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(re-search-forward (concat "^import .*" package ".*\\(?:\\*\\|" class "\\);") nil t))
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(when (and class-found (not import-found))
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(org-babel-java--move-past org-babel-java--package-re)
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(insert (concat "import " package "." class ";\n")))))
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(defun org-babel-expand-body:java (body params)
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"Expand BODY with PARAMS.
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BODY could be a few statements, or could include a full class
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definition specifying package, imports, and class. Because we
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allow this flexibility in what the source block can contain, it
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is simplest to expand the code block from the inside out."
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(let* ((fullclassname (or (cdr (assq :classname params)) ; class and package
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(org-babel-java-find-classname body)))
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(classname (car (last (split-string fullclassname "\\.")))) ; just class name
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(packagename (if (string-match-p "\\." fullclassname) ; just package name
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(file-name-base fullclassname)))
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(var-lines (org-babel-variable-assignments:java params))
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(imports-val (assq :imports params))
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(imports (if imports-val
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(split-string (org-babel-read (cdr imports-val) nil) " ")
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nil)))
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(with-temp-buffer
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(insert body)
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;; wrap main. If there are methods defined, but no main method
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;; and no class, wrap everything in a generic main method.
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(goto-char (point-min))
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(when (and (not (re-search-forward org-babel-java--main-re nil t))
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(not (re-search-forward org-babel-java--any-method-re nil t)))
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(org-babel-java--move-past org-babel-java--package-re) ; if package is defined, move past it
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(org-babel-java--move-past org-babel-java--imports-re) ; if imports are defined, move past them
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(insert "public static void main(String[] args) {\n")
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(indent-code-rigidly (point) (point-max) 4)
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(goto-char (point-max))
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(insert "\n}"))
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;; wrap class. If there's no class, wrap everything in a
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;; generic class.
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(goto-char (point-min))
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(when (not (re-search-forward org-babel-java--class-re nil t))
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(org-babel-java--move-past org-babel-java--package-re) ; if package is defined, move past it
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(org-babel-java--move-past org-babel-java--imports-re) ; if imports are defined, move past them
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(insert (concat "\npublic class " (file-name-base classname) " {\n"))
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(indent-code-rigidly (point) (point-max) 4)
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(goto-char (point-max))
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(insert "\n}"))
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(goto-char (point-min))
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;; insert variables from source block headers
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(when var-lines
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(goto-char (point-min))
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(org-babel-java--move-past org-babel-java--class-re) ; move inside class
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(insert (mapconcat 'identity var-lines "\n"))
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(insert "\n"))
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;; add imports from source block headers
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(when imports
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(goto-char (point-min))
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(org-babel-java--move-past org-babel-java--package-re) ; if package is defined, move past it
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(insert (mapconcat (lambda (package) (concat "import " package ";")) imports "\n") "\n"))
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;; add package at the top
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(goto-char (point-min))
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(when (and packagename (not (re-search-forward org-babel-java--package-re nil t)))
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(insert (concat "package " packagename ";\n")))
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;; return expanded body
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(buffer-string))))
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(defun org-babel-variable-assignments:java (params)
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"Return a list of java statements assigning the block's variables.
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variables are contained in PARAMS."
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(mapcar
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(lambda (pair)
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(let* ((type-data (org-babel-java-val-to-type (cdr pair)))
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(basetype (car type-data))
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(var-to-java (lambda (var) (funcall #'org-babel-java-var-to-java var basetype))))
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(format " static %s %s = %s;"
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(cdr type-data) ; type
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(car pair) ; name
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(funcall var-to-java (cdr pair))))) ; value
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(org-babel--get-vars params)))
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(defun org-babel-java-var-to-java (var basetype)
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"Convert an elisp value to a java variable.
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Convert an elisp value, VAR, of type BASETYPE into a string of
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java source code specifying a variable of the same value."
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(cond ((and (sequencep var) (not (stringp var)))
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(let ((var-to-java (lambda (var) (funcall #'org-babel-java-var-to-java var basetype))))
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(concat "Arrays.asList(" (mapconcat var-to-java var ", ") ")")))
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((eq var 'hline) org-babel-java-hline-to)
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((eq basetype 'integerp) (format "%d" var))
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((eq basetype 'floatp) (format "%f" var))
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((eq basetype 'stringp) (if (and (stringp var) (string-match-p ".\n+." var))
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(error "Java does not support multiline string literals")
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(format "\"%s\"" var)))))
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(defun org-babel-java-val-to-type (val)
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"Determine the type of VAL.
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Return (BASETYPE . LISTTYPE), where BASETYPE is a symbol
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representing the type of the individual items in VAL, and
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LISTTYPE is a string name of the type parameter for a container
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for BASETYPE items."
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(let* ((basetype (org-babel-java-val-to-base-type val))
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(basetype-str (pcase basetype
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(`integerp "Integer")
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(`floatp "Double")
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(`stringp "String")
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(_ (error "Unknown type %S" basetype)))))
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(cond
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((and (listp val) (listp (car val))) ; a table
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(cons basetype (format "List<List<%s>>" basetype-str)))
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((or (listp val) (vectorp val)) ; a list declared in the source block header
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(cons basetype (format "List<%s>" basetype-str)))
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(t ; return base type
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(cons basetype basetype-str)))))
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(defun org-babel-java-val-to-base-type (val)
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"Determine the base type of VAL.
|
|
VAL may be
|
|
`integerp' if all base values are integers
|
|
`floatp' if all base values are either floating points or integers
|
|
`stringp' otherwise."
|
|
(cond
|
|
((integerp val) 'integerp)
|
|
((floatp val) 'floatp)
|
|
((or (listp val) (vectorp val))
|
|
(let ((type nil))
|
|
(mapc (lambda (v)
|
|
(pcase (org-babel-java-val-to-base-type v)
|
|
(`stringp (setq type 'stringp))
|
|
(`floatp
|
|
(when (or (not type) (eq type 'integerp))
|
|
(setq type 'floatp)))
|
|
(`integerp
|
|
(unless type (setq type 'integerp)))))
|
|
val)
|
|
type))
|
|
(t 'stringp)))
|
|
|
|
(defun org-babel-java-table-or-string (results)
|
|
"Convert RESULTS into an appropriate elisp value.
|
|
If the results look like a list or vector, then convert them into an
|
|
Emacs-lisp table, otherwise return the results as a string."
|
|
(let ((res (org-babel-script-escape results)))
|
|
(if (listp res)
|
|
(mapcar (lambda (el) (if (eq 'null el)
|
|
org-babel-java-null-to
|
|
el))
|
|
res)
|
|
res)))
|
|
|
|
(defun org-babel-java-evaluate (cmd result-type result-params result-file)
|
|
"Evaluate using an external java process.
|
|
CMD the command to execute.
|
|
|
|
If RESULT-TYPE equals `output' then return standard output as a
|
|
string. If RESULT-TYPE equals `value' then return the value
|
|
returned by the source block, as elisp.
|
|
|
|
RESULT-PARAMS input params used to format the response.
|
|
|
|
RESULT-FILE filename of the tempfile to store the returned value in
|
|
for `value' RESULT-TYPE. Not used for `output' RESULT-TYPE."
|
|
(let ((raw (pcase result-type
|
|
(`output (org-babel-eval cmd ""))
|
|
(`value (org-babel-eval cmd "")
|
|
(org-babel-eval-read-file result-file)))))
|
|
(org-babel-result-cond result-params raw
|
|
(org-babel-java-table-or-string raw))))
|
|
|
|
(provide 'ob-java)
|
|
|
|
;;; ob-java.el ends here
|