initial.

.editorconfig

@@ -0,0 +1,11 @@
+
+root = true
+
+[*]
+tab_width = 8
+
+[*.{cpp,h}]
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+insert_final_newline = true

.gitignore

@@ -30,3 +30,6 @@
 *.exe
 *.out
 *.app
+
+# backup files
+*~

LICENSE

@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
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+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.

README.md

@@ -1,2 +1,60 @@
-# my-lisp
-A small Lisp interpreter
+
+# my-lisp -- A small Lisp interpreter
+
+非常に小さな Lisp インタプリタ。
+
+参考:
+<a href="https://github.com/kanaka/mal/blob/master/process/guide.md">The Make-A-Lisp Process</a>
+ただ, MAL は Clojure に近く、Lisp らしい感じとは若干異なる。
+
+Common Lisp か Scheme が有力。とりあえず Common Lisp のサブセットを実装。
+
+C++17
+
+
+
+ - REPL Read-Eval-Print-Loop
+   + ✅ GNU Readline はライセンスが GPLv3 なので使えない。libedit-devel を利用
+
+ - Reader, Print
+   + ✅ ファイルからの読み込み `READ()` 関数, S式の構築、画面への表示 `PRINT()` 関数
+     - 文法をユーザが拡張できるので, bison/flex は使えない。手書き。
+   + ✅ Standard Macro Characters
+   + reader macro
+   + Sharpsign (dispatching macro character)
+     - `simple-vector`
+
+ - Environments
+   + ✅ 変数定義. `SETQ`
+   + レキシカルスコープ. `LET`, `LET*`
+   + ビルトイン関数
+   + ✅ 関数呼び出し. Function `FUNCALL`
+
+ - Eval
+   + `EVAL()` をつくる
+   + atom の評価
+   + `lambda` 式からクロージャをつくる
+   + ユーザ定義関数
+
+ - Special operator `IF`, macro `DO`
+
+ - Tail Call Optimization (TCO)
+
+ - Files
+
+ - ✅ Quoting `QUOTE`
+
+ - Macros
+   + Backquote `quasiquote`, Comma `unquote`, `,@` `unquote-splicing`
+   + Function `MACROEXPAND`
+
+ - Try (Conditions)
+   + `tagbody` & 無条件ジャンプ `go`  -- 実装しない
+   + `block` & `return-from`
+   + `catch` & `throw`   -- ほかのプログラミング言語の例外処理とは異なる。実装しない
+   + `handler-bind` or `handler-case`  -- これが例外処理
+
+ - 若干のライブラリ
+   + type `hash-table`. `(make-hash-table)`
+
+

edit_line.cpp

@@ -0,0 +1,57 @@
+
+// GNU Readline は GPLv3 でライセンスされるため, GPLed なソフトウェア以外では
+// 使えない. libedit-devel-3.1-45.20221030cvs.fc38.x86_64 を使う
+
+#include "edit_line.h"
+#include "my_debug.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <editline/readline.h>
+#include <unicode/unistr.h>
+using namespace icu;
+
+/* @note /usr/include/readline/tilde.h ファイルで定義される:
+         extern char *tilde_expand (const char *);
+*/
+
+
+namespace my {
+
+EditLine::EditLine(const UnicodeString& historyFile)
+{
+    std::string u;
+    char* v = tilde_expand( (char*) historyFile.toUTF8String(u).c_str() );
+    m_historyPath = UnicodeString((const char*) v);
+    free(v);
+
+    u = "";
+    m_historyPath.toUTF8String(u);
+    TRACE("history file = %s\n", u.c_str() );
+    read_history( u.c_str() );
+}
+
+EditLine::~EditLine()
+{
+    std::string u;
+    write_history(m_historyPath.toUTF8String(u).c_str());
+}
+
+bool EditLine::get(const UnicodeString& prompt, UnicodeString* out)
+{
+    std::string u;
+    char *line = readline( prompt.toUTF8String(u).c_str() );
+    if (line == NULL)
+        return false; // EOF かつ行が空のとき
+
+    add_history(line); // Add input to in-memory history
+    append_history(1, m_historyPath.toUTF8String(u).c_str() );
+
+    *out = UnicodeString((const char*) line);
+    free(line);
+
+    return true;
+}
+
+} // namespace my

edit_line.h

@@ -0,0 +1,23 @@
+
+#ifndef INCLUDE_READLINE_H
+#define INCLUDE_READLINE_H
+
+#include <unicode/unistr.h>
+
+namespace my {
+
+class EditLine
+{
+public:
+    EditLine(const icu::UnicodeString& historyFile);
+    ~EditLine();
+
+    bool get(const icu::UnicodeString& prompt, icu::UnicodeString* line);
+
+private:
+    icu::UnicodeString m_historyPath;
+};
+
+} // namespace my
+
+#endif // INCLUDE_READLINE_H