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/* Copyright (C) 2018 June McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define _XOPEN_SOURCE_EXTENDED
#include <curses.h>
#include <err.h>
#include <locale.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
static struct Span {
size_t at, to;
} Span(size_t at, size_t to) {
return (struct Span) { at, to };
}
static bool spanEqual(struct Span a, struct Span b) {
return a.at == b.at && a.to == b.to;
}
static bool spanIn(struct Span a, struct Span b) {
return a.at > b.at && a.to < b.to;
}
static bool spanHeadIn(struct Span a, struct Span b) {
return a.at > b.at && a.at < b.to;
}
static bool spanTailIn(struct Span a, struct Span b) {
return a.to > b.at && a.to < b.to;
}
static struct Vec {
char *ptr;
size_t len;
} Vec(char *ptr, size_t len) {
return (struct Vec) { ptr, len };
}
static struct Vec vecHead(struct Vec vec, struct Span span, size_t at) {
return Vec(vec.ptr, at - span.at);
}
static struct Vec vecTail(struct Vec vec, struct Span span, size_t at) {
return Vec(vec.ptr + (at - span.at), vec.len - (at - span.at));
}
static struct Table {
struct Table *next, *prev;
size_t len;
struct Vec vec[];
} *Table(size_t cap) {
size_t size = sizeof(struct Table) + cap * sizeof(struct Vec);
struct Table *table = malloc(size);
if (!table) err(EX_OSERR, "malloc");
memset(table, 0, size);
return table;
}
static struct TableIter {
struct Table *table;
size_t i;
struct Vec vec;
struct Span span;
} TableIter(struct Table *table) {
return (struct TableIter) { table, 0, Vec(NULL, 0), Span(0, 0) };
}
static bool tableNext(struct TableIter *it) {
if (it->i == it->table->len) return false;
it->vec = it->table->vec[it->i++];
it->span = Span(it->span.to, it->span.to + it->vec.len);
return true;
}
static bool tablePrev(struct TableIter *it) {
if (!it->i) return false;
it->vec = it->table->vec[--it->i];
it->span = Span(it->span.at - it->vec.len, it->span.at);
return true;
}
static struct Table *tableInsert(struct Table *prev, size_t at, struct Vec vec) {
struct Table *next = Table(prev->len + 2);
if (!prev->len) {
next->vec[next->len++] = vec;
return next;
}
struct Span span = Span(at, at + vec.len);
for (struct TableIter it = TableIter(prev); tableNext(&it); (void)it) {
if (it.span.at == at) {
next->vec[next->len++] = vec;
next->vec[next->len++] = it.vec;
} else if (spanHeadIn(span, it.span)) {
next->vec[next->len++] = vecHead(it.vec, it.span, at);
next->vec[next->len++] = vec;
next->vec[next->len++] = vecTail(it.vec, it.span, at);
} else {
next->vec[next->len++] = it.vec;
}
}
return next;
}
static struct Table *tableDelete(struct Table *prev, struct Span span) {
struct Table *next = Table(prev->len + 1);
for (struct TableIter it = TableIter(prev); tableNext(&it); (void)it) {
if (spanIn(it.span, span) || spanEqual(it.span, span)) {
// drop
} else if (spanIn(span, it.span)) {
next->vec[next->len++] = vecHead(it.vec, it.span, span.at);
next->vec[next->len++] = vecTail(it.vec, it.span, span.to);
} else if (spanHeadIn(span, it.span)) {
next->vec[next->len++] = vecHead(it.vec, it.span, span.at);
} else if (spanTailIn(span, it.span)) {
next->vec[next->len++] = vecTail(it.vec, it.span, span.to);
} else {
next->vec[next->len++] = it.vec;
}
}
return next;
}
static struct VecIter {
struct Vec vec;
size_t i;
wchar_t ch;
} VecIter(struct Vec vec, size_t i) {
return (struct VecIter) { vec, i, 0 };
}
static bool vecNext(struct VecIter *it) {
if (it->i >= it->vec.len) return false;
int len = mbtowc(&it->ch, &it->vec.ptr[it->i], it->vec.len - it->i);
if (len < 0) errx(EX_DATAERR, "mbtowc");
it->i += len;
return true;
}
static bool vecPrev(struct VecIter *it) {
if (!it->i) return false;
int len;
for (int n = 1; n < MB_CUR_MAX; ++n) {
len = mbtowc(&it->ch, &it->vec.ptr[it->i - n], n);
if (len > 0) break;
}
if (len < 0) errx(EX_DATAERR, "mbtowc");
it->i -= len;
return true;
}
//static void curse(void) {
// setlocale(LC_CTYPE, "");
// initscr();
// cbreak();
// noecho();
// keypad(stdscr, true);
// set_escdelay(100);
//}
//
//static void curseChar(wchar_t ch, attr_t attr, short color) {
// cchar_t cc;
// wchar_t ws[] = { ch, 0 };
// setcchar(&cc, ws, attr, color, NULL);
// add_wch(&cc);
//}
static void draw(struct Table *table) {
//move(0, 0);
struct TableIter it = TableIter(table);
tableNext(&it);
printf("(%zu,%zu)%.*s", it.span.at, it.span.to, (int)it.vec.len, it.vec.ptr);
tableNext(&it);
printf("(%zu,%zu)%.*s", it.span.at, it.span.to, (int)it.vec.len, it.vec.ptr);
tablePrev(&it);
printf("(%zu,%zu)%.*s", it.span.at, it.span.to, (int)it.vec.len, it.vec.ptr);
tablePrev(&it);
printf("(%zu,%zu)%.*s", it.span.at, it.span.to, (int)it.vec.len, it.vec.ptr);
}
int main() {
struct Table *table = Table(0);
table = tableInsert(table, 0, Vec("Hello, world!\nGoodbye, world!\n", 30));
table = tableDelete(table, Span(1, 5));
table = tableInsert(table, 1, Vec("owdy", 4));
table = tableDelete(table, Span(3, 6));
table = tableInsert(table, 3, Vec(" Ω", 3));
//curse();
draw(table);
//getch();
//endwin();
}
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