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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 "types.hpp"
#include <cctype>
#include <cstdlib>
static void parseword(const char *start, const char *end)
{
if (start != end) {
if (auto word = find(start, end - start); word) {
if (!word->immediate() && STATE) {
comma((Cell)word->list);
} else {
execute1(word);
}
} else if (isdigit(*start)) {
*++SP = std::atoi(start);
if (STATE)
compileliteral();
}
}
}
void parseSource()
{
auto start = (char *)DICT[DIdxSource];
auto end = start;
// Try to build words while we have input available.
while (haskey()) {
end = (char *)++DICT[DIdxSource];
--DICT[DIdxSrcLen];
if (isspace(*end)) {
// May have collected a word.
// parseword() will check if start != end.
parseword(start, end);
start = (char *)(DICT[DIdxSource] + 1);
}
}
// Parse the final word if it is non-empty.
if (start != end)
parseword(start, end);
}
void parse()
{
// Reset source buffer and try to fill it with getinput().
DICT[DIdxSource] = (Cell)&DICT[DIdxBegin];
DICT[DIdxSrcLen] = 0;
getinput();
parseSource();
}
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