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// sprit-forth: A portable subroutine-threaded Forth.
// Copyright (C) 2023 Clyne Sullivan <clyne@bitgloo.com>
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Library General Public License as published by
// the Free Software Foundation; either version 2 of the License, or (at your
// option) any later version.
//
// This library 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 Library General Public License for
// more details.
//
// You should have received a copy of the GNU Library General Public License
// along with this library; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
#include "core.hpp"
#include "state.hpp"
#include <cctype>
void jump(FuncList ip)
{
IP = ip - 1;
}
static auto literall = WordWrap<[] {
*++SP = (Cell)*++IP;
}>();
void compileliteral()
{
comma((Cell)literall);
comma(*SP--);
}
bool haskey()
{
return DICT[DIdxSrcLen] > 0;
}
void addkey(int k)
{
--DICT[DIdxSource];
++DICT[DIdxSrcLen];
auto ptr = reinterpret_cast<char *>(DICT[DIdxSource]);
*ptr = static_cast<char>(k);
}
int key()
{
while (!haskey())
getinput();
auto ptr = reinterpret_cast<char *>(DICT[DIdxSource]);
++DICT[DIdxSource];
--DICT[DIdxSrcLen];
return *ptr;
}
Cell *comma(Cell n)
{
const auto ptr = reinterpret_cast<Cell *>(HERE);
*ptr = n;
HERE += sizeof(Cell);
return ptr;
}
Addr aligned(Addr addr)
{
return (addr + (sizeof(Cell) - 1)) & ~(sizeof(Cell) - 1);
}
void align()
{
HERE = aligned(HERE);
}
void word()
{
int k;
do {
k = key();
} while (isspace(k));
char *ptr;
do {
ptr = reinterpret_cast<char *>(HERE);
*ptr = k;
++HERE;
if (!haskey())
break;
k = key();
} while (!isspace(k));
addkey(k);
ptr = reinterpret_cast<char *>(HERE);
*ptr = '\0';
++HERE;
}
void colon()
{
align();
auto name = HERE;
word();
align();
comma(HERE + 4 * sizeof(Cell)); // exec ptr
comma(name); // name ptr
*++SP = (Cell)comma(0); // link (filled by latest)
comma(0); // immediate
comma((Cell)+[](FuncList *ip) {
++ip;
*++RP = (Cell)IP;
jump((FuncList)*ip);
});
comma(HERE + sizeof(Cell));
STATE = -1;
}
void semic()
{
comma((Cell)fexit);
auto link = (Cell *)*SP--;
*link = LATEST;
LATEST = (Cell)(link - 2);
STATE = 0;
}
// : ' bl word find drop ;
void tick()
{
auto name = (char *)HERE;
word();
int len = HERE - (Cell)name - 1;
auto word = find(name, len);
*++SP = (Cell)word;
HERE = (Cell)name;
}
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