diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fa983e1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+.*
+*.o
+alee
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..5357f69
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,166 @@
+ GNU LESSER GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc.
+ 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
+ recombine or relink the Application with a modified version of
+ 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.
+
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b34026a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,13 @@
+CXXFLAGS += -g3 -ggdb -O0
+
+CXXFILES := corewords.cpp types.cpp
+OBJFILES := $(subst .cpp,.o,$(CXXFILES))
+EXEFILE := alee
+
+all: alee
+
+alee: $(OBJFILES)
+
+clean:
+ rm -f alee $(OBJFILES)
+
diff --git a/alee.cpp b/alee.cpp
new file mode 100644
index 0000000..8ca209c
--- /dev/null
+++ b/alee.cpp
@@ -0,0 +1,58 @@
+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see .
+ */
+
+#include "memdict.hpp"
+#include "parser.hpp"
+
+#include
+
+// : variable create 0 , ;
+// : create here constant ;
+// : constant
+
+int main()
+{
+ MemDict dict;
+ State state (dict);
+ Parser parser;
+
+ for (;;) {
+ std::string line;
+ std::cout << state.size() << ' ' << state.compiling << "> ";
+ std::getline(std::cin, line);
+
+ ParseStatus r;
+ std::string_view lv (line);
+ do {
+ r = parser.parse(state, lv);
+ } while (r == ParseStatus::Continue);
+
+ if (r != ParseStatus::Finished)
+ std::cout << "r " << to_string(r) << std::endl;
+ }
+
+ return 0;
+}
+
+int user_sys(State& state)
+{
+ const auto value = state.pop();
+ std::cout << value << std::endl;
+ return 0;
+}
+
diff --git a/corewords.cpp b/corewords.cpp
new file mode 100644
index 0000000..6595e41
--- /dev/null
+++ b/corewords.cpp
@@ -0,0 +1,293 @@
+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see .
+ */
+
+#include "corewords.hpp"
+
+Func CoreWords::get(int index)
+{
+ switch (index) {
+ case 0: return op_drop;
+ case 1: return op_dup;
+ case 2: return op_swap;
+ case 3: return op_pick;
+ case 4: return op_sys;
+ case 5: return op_add;
+ case 6: return op_sub;
+ case 7: return op_mul;
+ case 8: return op_div;
+ case 9: return op_mod;
+ case 10: return op_peek;
+ case 11: return op_poke;
+ case 12: return op_rot;
+ case 13: return op_pushr;
+ case 14: return op_popr;
+ case 15: return op_eq;
+ case 16: return op_lt;
+ case 17: return op_allot;
+ case 18: return op_and;
+ case 19: return op_or;
+ case 20: return op_xor;
+ case 21: return op_shl;
+ case 22: return op_shr;
+ case 23: return op_comment;
+ case 24: return op_colon;
+ case 25: return op_semic;
+ case 26: return op_here;
+ case 27: return op_exit;
+ case 28: return op_imm;
+ case 29: return op_const;
+ case 30: return op_literal;
+ case 31: return op_jump;
+ default: return nullptr;
+ }
+}
+
+int CoreWords::op_drop(State& state)
+{
+ state.pop();
+ return 0;
+}
+
+int CoreWords::op_dup(State& state)
+{
+ state.push(state.top());
+ return 0;
+}
+
+int CoreWords::op_swap(State& state)
+{
+ std::swap(state.top(), state.pick(1));
+ return 0;
+}
+
+int CoreWords::op_pick(State& state)
+{
+ state.push(state.pick(state.pop()));
+ return 0;
+}
+
+int CoreWords::op_sys(State& state)
+{
+ return user_sys(state);
+}
+
+int CoreWords::op_add(State& state)
+{
+ const auto a = state.pop();
+ state.top() += a;
+ return 0;
+}
+
+int CoreWords::op_sub(State& state)
+{
+ const auto a = state.pop();
+ state.top() -= a;
+ return 0;
+}
+
+int CoreWords::op_mul(State& state) {
+ const auto a = state.pop();
+ state.top() *= a;
+ return 0;
+}
+
+int CoreWords::op_div(State& state) {
+ const auto a = state.pop();
+ state.top() /= a;
+ return 0;
+}
+
+int CoreWords::op_mod(State& state) {
+ const auto a = state.pop();
+ state.top() %= a;
+ return 0;
+}
+
+int CoreWords::op_peek(State& state) {
+ state.push(state.dict.read(state.pop()));
+ return 0;
+}
+
+int CoreWords::op_poke(State& state) {
+ const auto addr = state.pop();
+ state.dict.write(addr, state.pop());
+ return 0;
+}
+
+int CoreWords::op_rot(State& state) {
+ std::swap(state.pick(2), state.pick(1));
+ std::swap(state.pick(1), state.pick(0));
+ return 0;
+}
+
+int CoreWords::op_pushr(State& state) {
+ state.pushr(state.pop());
+ return 0;
+}
+
+int CoreWords::op_popr(State& state) {
+ state.push(state.popr());
+ return 0;
+}
+
+int CoreWords::op_eq(State& state) {
+ const auto a = state.pop();
+ state.top() = state.top() == a;
+ return 0;
+}
+
+int CoreWords::op_lt(State& state) {
+ const auto a = state.pop();
+ state.top() = state.top() < a;
+ return 0;
+}
+
+int CoreWords::op_allot(State& state) {
+ state.dict.allot(state.pop());
+ return 0;
+}
+
+int CoreWords::op_and(State& state) {
+ const auto a = state.pop();
+ state.top() &= a;
+ return 0;
+}
+
+int CoreWords::op_or(State& state) {
+ const auto a = state.pop();
+ state.top() |= a;
+ return 0;
+}
+
+int CoreWords::op_xor(State& state) {
+ const auto a = state.pop();
+ state.top() ^= a;
+ return 0;
+}
+
+int CoreWords::op_shl(State& state) {
+ const auto a = state.pop();
+ state.top() <<= a;
+ return 0;
+}
+
+int CoreWords::op_shr(State& state) {
+ const auto a = state.pop();
+ state.top() >>= a;
+ return 0;
+}
+
+int CoreWords::op_comment(State& state) {
+ state.pass = Pass::Comment;
+ return 0;
+}
+
+int CoreWords::op_colon(State& state) {
+ state.pass = Pass::Colon;
+ state.pushr(state.dict.here); // this is for EXIT
+ return 0;
+}
+
+int CoreWords::op_semic(State& state) {
+ if (!state.compiling) {
+ state.ip = state.popr();
+ } else {
+ auto begin = state.popr();
+
+ state.dict.write(begin,
+ (state.dict.read(begin) & 0x1F) |
+ ((begin - state.dict.latest) << 6));
+
+ state.dict.latest = begin;
+ state.compiling = false;
+ }
+
+ return 0;
+}
+
+int CoreWords::op_here(State& state) {
+ state.push(state.dict.here);
+ return 0;
+}
+
+int CoreWords::op_exit(State& state)
+{
+ state.ip = state.popr();
+ return 0;
+}
+
+int CoreWords::op_imm(State& state)
+{
+ state.dict.write(state.dict.latest,
+ state.dict.read(state.dict.latest) | Immediate);
+ return 0;
+}
+
+int CoreWords::op_const(State& state)
+{
+ state.pass = Pass::Constant;
+ state.pushr(state.dict.here);
+ return 0;
+}
+
+int CoreWords::op_literal(State& state)
+{
+ state.push(state.beyondip());
+ ++state.ip;
+ return 0;
+}
+
+int CoreWords::op_jump(State& state)
+{
+ state.pushr(state.ip + 1);
+ state.ip = state.beyondip() - 1;
+ return 0;
+}
+
+int CoreWords::findi(std::string_view str)
+{
+ std::size_t i;
+ int wordsi = 0;
+
+ std::string_view words (wordsarr, sizeof(wordsarr));
+
+ for (i = 0; i < words.size();) {
+ const auto end = words.find('\0', i);
+
+ if (words.compare(i, end - i, str) == 0)
+ break;
+
+ ++wordsi;
+ i = end + 1;
+ }
+
+ return wordsi < VisibleWordCount ? wordsi : -1;
+}
+
+Func CoreWords::find(std::string_view str)
+{
+ const auto i = findi(str);
+ return i >= 0 ? get(i) : nullptr;
+}
+
+void CoreWords::run(int i, State& state)
+{
+ if (i >= 0 && i < WordCount)
+ get(i)(state);
+}
+
diff --git a/corewords.hpp b/corewords.hpp
new file mode 100644
index 0000000..08f172b
--- /dev/null
+++ b/corewords.hpp
@@ -0,0 +1,88 @@
+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see .
+ */
+
+#ifndef ALEEFORTH_COREWORDS_HPP
+#define ALEEFORTH_COREWORDS_HPP
+
+#include "types.hpp"
+#include "state.hpp"
+
+int user_sys(State&);
+
+class CoreWords
+{
+public:
+ constexpr static std::size_t VisibleWordCount = 30; // size
+ constexpr static std::size_t HiddenWordLiteral = 30; // index
+ constexpr static std::size_t HiddenWordJump = 31; // index
+ constexpr static std::size_t WordCount = 32; // size
+
+ constexpr static Cell Immediate = (1 << 5);
+
+ static int findi(std::string_view str);
+ static Func find(std::string_view str);
+ static void run(int i, State& state);
+
+private:
+ constexpr static char wordsarr[] =
+ "drop\0dup\0swap\0pick\0sys\0"
+ "+\0-\0*\0/\0%\0"
+ "@\0!\0rot\0>r\0r>\0"
+ "=\0<\0allot\0&\0|\0"
+ "^\0<<\0>>\0(\0:\0"
+ ";\0here\0exit\0imm\0const\0";
+ // lit, jmp, jmp0, ', lits
+
+ static Func get(int index);
+
+ static int op_drop(State& state);
+ static int op_dup(State& state);
+ static int op_swap(State& state);
+ static int op_pick(State& state);
+ static int op_sys(State& state);
+ static int op_add(State& state);
+ static int op_sub(State& state);
+ static int op_mul(State& state);
+ static int op_div(State& state);
+ static int op_mod(State& state);
+ static int op_peek(State& state);
+ static int op_poke(State& state);
+ static int op_rot(State& state);
+ static int op_pushr(State& state);
+ static int op_popr(State& state);
+ static int op_eq(State& state);
+ static int op_lt(State& state);
+ static int op_allot(State& state);
+ static int op_and(State& state);
+ static int op_or(State& state);
+ static int op_xor(State& state);
+ static int op_shl(State& state);
+ static int op_shr(State& state);
+ static int op_comment(State& state);
+ static int op_colon(State& state);
+ static int op_semic(State& state);
+ static int op_here(State& state);
+ static int op_exit(State& state);
+ static int op_imm(State& state);
+ static int op_const(State& state);
+ static int op_literal(State& state);
+ static int op_jump(State& state);
+};
+
+#endif // ALEEFORTH_COREWORDS_HPP
+
diff --git a/dictionary.hpp b/dictionary.hpp
new file mode 100644
index 0000000..c527603
--- /dev/null
+++ b/dictionary.hpp
@@ -0,0 +1,92 @@
+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see .
+ */
+
+#ifndef ALEEFORTH_DICTIONARY_HPP
+#define ALEEFORTH_DICTIONARY_HPP
+
+#include "types.hpp"
+
+#include
+#include
+
+struct Dictionary
+{
+ Addr here = 1;
+ Addr latest = 0;
+
+ virtual Cell read(Addr) const = 0;
+ virtual int write(Addr, Cell) = 0;
+
+ Addr allot(Cell amount) {
+ Addr old = here;
+ here += amount;
+ return old;
+ }
+
+ void add(Cell value) {
+ write(here++, value);
+ }
+
+ void addDefinition(std::string_view str) {
+ add(str.size());
+ for (char c : str)
+ add(c);
+
+ if (here & 1)
+ allot(1);
+ }
+
+ bool issame(Addr addr, std::string_view str, std::size_t n) {
+ if (str.size() != n)
+ return false;
+
+ for (char c : str) {
+ if (read(addr++) != c)
+ return false;
+ }
+
+ return true;
+ }
+
+ Addr find(std::string_view str) {
+ if (latest == 0)
+ return 0;
+
+ auto lt = latest;
+ do {
+ const auto l = read(lt);
+ const auto len = l & 0x1F;
+
+ if (issame(lt + 1, str, len)) {
+ return lt;
+ } else {
+ lt -= l >> 6;
+ }
+ } while (lt);
+
+ return 0;
+ }
+
+ Addr getexec(Addr addr) {
+ const auto len = read(addr) & 0x1F;
+ return ((addr + 1 + len) + 1) & ~1;
+ }
+};
+
+#endif // ALEEFORTH_DICTIONARY_HPP
+
diff --git a/executor.hpp b/executor.hpp
new file mode 100644
index 0000000..485e82a
--- /dev/null
+++ b/executor.hpp
@@ -0,0 +1,44 @@
+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see .
+ */
+
+#ifndef ALEEFORTH_EXECUTOR_HPP
+#define ALEEFORTH_EXECUTOR_HPP
+
+#include "corewords.hpp"
+
+//#include
+
+class Executor
+{
+public:
+ static int fullexec(State& state, Addr addr) {
+ state.pushr(0);
+ state.ip = addr - 1;
+
+ do {
+ ++state.ip;
+ //std::cout << "-- " << state.rsize() << "e " << state.ip << std::endl;
+ CoreWords::run(state.dict.read(state.ip), state);
+ } while (state.ip);
+
+ return 0;
+ }
+};
+
+#endif // ALEEFORTH_EXECUTOR_HPP
+
diff --git a/memdict.hpp b/memdict.hpp
new file mode 100644
index 0000000..8606da2
--- /dev/null
+++ b/memdict.hpp
@@ -0,0 +1,42 @@
+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see .
+ */
+
+#ifndef ALEEFORTH_MEMDICT_HPP
+#define ALEEFORTH_MEMDICT_HPP
+
+#include "dictionary.hpp"
+
+constexpr unsigned long int MemDictSize = 4096;
+
+class MemDict : public Dictionary
+{
+ Cell dict[MemDictSize];
+
+public:
+ virtual Cell read(Addr addr) const final {
+ return dict[addr];
+ }
+
+ virtual int write(Addr addr, Cell value) final {
+ dict[addr] = value;
+ return 0;
+ }
+};
+
+#endif // ALEEFORTH_MEMDICT_HPP
+
diff --git a/parser.hpp b/parser.hpp
new file mode 100644
index 0000000..a850cb8
--- /dev/null
+++ b/parser.hpp
@@ -0,0 +1,107 @@
+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see .
+ */
+
+#ifndef ALEEFORTH_PARSER_HPP
+#define ALEEFORTH_PARSER_HPP
+
+#include "executor.hpp"
+
+class Parser
+{
+public:
+ ParseStatus parse(State& state, std::string_view& str) {
+ const auto end = str.find_first_of(" \t\n\r");
+ const auto sub = str.substr(0, end);
+
+ if (state.pass != Pass::None) {
+ switch (state.pass) {
+ case Pass::Comment:
+ if (str.front() == ')')
+ state.pass = Pass::None;
+
+ str = str.substr(1);
+ break;
+ case Pass::Colon:
+ state.pass = Pass::None;
+ state.compiling = true;
+ state.dict.addDefinition(sub);
+ break;
+ case Pass::Constant:
+ state.pass = Pass::None;
+ state.compiling = true;
+ state.dict.addDefinition(sub);
+ state.dict.add(CoreWords::HiddenWordLiteral);
+ state.dict.add(state.pop());
+ state.dict.add(CoreWords::findi("exit"));
+ break;
+ default:
+ break;
+ }
+ } else {
+ if (auto i = CoreWords::findi(sub); i >= 0) {
+ if (state.compiling)
+ state.dict.add(i);
+ if (!state.compiling || sub.front() == ';')
+ CoreWords::run(i, state);
+ } else if (auto j = state.dict.find(sub); j > 0) {
+ auto e = state.dict.getexec(j);
+ if (state.compiling) {
+ if (state.dict.read(j) & CoreWords::Immediate) {
+ state.compiling = false;
+ Executor::fullexec(state, e);
+ state.compiling = true;
+ } else {
+ state.dict.add(CoreWords::HiddenWordJump);
+ state.dict.add(e);
+ }
+ } else {
+ Executor::fullexec(state, e);
+ }
+ } else {
+ char *p;
+ const auto l = static_cast| (std::strtol(sub.data(), &p, 10));
+
+ if (p != sub.data()) {
+ if (state.compiling) {
+ state.dict.add(CoreWords::HiddenWordLiteral);
+ state.dict.add(l);
+ } else {
+ state.push(l);
+ }
+ } else {
+ return ParseStatus::Error;
+ }
+ }
+
+ if (end == std::string_view::npos)
+ return ParseStatus::Finished;
+ }
+
+ const auto next = str.find_first_not_of(" \t\n\r", end);
+
+ if (next == std::string_view::npos) {
+ return ParseStatus::Finished;
+ } else {
+ str = str.substr(next);
+ return ParseStatus::Continue;
+ }
+ }
+};
+
+#endif // ALEEFORTH_PARSER_HPP
+
diff --git a/state.hpp b/state.hpp
new file mode 100644
index 0000000..03d0084
--- /dev/null
+++ b/state.hpp
@@ -0,0 +1,96 @@
+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see .
+ */
+
+#ifndef ALEEFORTH_STATE_HPP
+#define ALEEFORTH_STATE_HPP
+
+#include "dictionary.hpp"
+#include "types.hpp"
+
+#include
+#include
+
+constexpr unsigned DataStackSize = 12;
+constexpr unsigned ReturnStackSize = 12;
+
+class State
+{
+ Cell dstack[DataStackSize] = {};
+ Cell rstack[ReturnStackSize] = {};
+ Cell *dsp = dstack - 1;
+ Cell *rsp = rstack - 1;
+
+public:
+ bool compiling = false;
+ Addr ip = 0;
+ Pass pass = Pass::None;
+ Dictionary& dict;
+
+ constexpr State(Dictionary& d): dict(d) {}
+
+ Cell beyondip() const {
+ return dict.read(ip + 1);
+ }
+
+ void pushr(Cell value) {
+ if (rsize() == ReturnStackSize)
+ throw;
+ *++rsp = value;
+ }
+
+ Cell popr() {
+ if (rsize() == 0)
+ throw;
+ return *rsp--;
+ }
+
+ void push(Cell value) {
+ if (size() == DataStackSize)
+ throw;
+ *++dsp = value;
+ }
+
+ Cell pop() {
+ if (size() == 0)
+ throw;
+ return *dsp--;
+ }
+
+ Cell& top() {
+ if (size() == 0)
+ throw;
+ return *dsp;
+ }
+
+ Cell& pick(std::size_t i) {
+ if (i >= size())
+ throw;
+ return *(dsp - i);
+ }
+
+ std::size_t size() const noexcept {
+ return std::distance(dstack, static_cast(dsp)) + 1;
+ }
+
+ std::size_t rsize() const noexcept {
+ return std::distance(rstack, static_cast(rsp)) + 1;
+ }
+};
+
+#endif // ALEEFORTH_STATE_HPP
+
diff --git a/types.cpp b/types.cpp
new file mode 100644
index 0000000..c1fc822
--- /dev/null
+++ b/types.cpp
@@ -0,0 +1,30 @@
+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see .
+ */
+
+#include "types.hpp"
+
+std::string_view to_string(ParseStatus ps)
+{
+ switch (ps) {
+ case ParseStatus::Finished: return "Finished";
+ case ParseStatus::Continue: return "Continue";
+ case ParseStatus::Error: return "Error";
+ default: return "???";
+ }
+}
+
diff --git a/types.hpp b/types.hpp
new file mode 100644
index 0000000..124f5ba
--- /dev/null
+++ b/types.hpp
@@ -0,0 +1,49 @@
+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see .
+ */
+
+#ifndef ALEEFORTH_TYPES_HPP
+#define ALEEFORTH_TYPES_HPP
+
+#include
+#include
+
+struct State;
+
+using Addr = uint16_t;
+using Cell = int16_t;
+using Func = int (*)(State&);
+
+enum class Pass
+{
+ None,
+ Comment,
+ Colon,
+ Constant
+};
+
+enum class ParseStatus
+{
+ Finished,
+ Continue,
+ Error
+};
+
+std::string_view to_string(ParseStatus ps);
+
+#endif // ALEEFORTH_TYPES_HPP
+
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