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#include "view.h"
#include "buffer.h"
#include "indent.h"
#include "util/ascii.h"
#include "util/debug.h"
#include "util/str-util.h"
#include "util/utf8.h"
#include "window.h"
void view_update_cursor_y(View *view)
{
Buffer *buffer = view->buffer;
Block *blk;
size_t nl = 0;
block_for_each(blk, &buffer->blocks) {
if (blk == view->cursor.blk) {
nl += count_nl(blk->data, view->cursor.offset);
view->cy = nl;
return;
}
nl += blk->nl;
}
BUG("unreachable");
}
void view_update_cursor_x(View *view)
{
StringView line;
const unsigned int tw = view->buffer->options.tab_width;
const size_t cx = fetch_this_line(&view->cursor, &line);
long cx_char = 0;
long w = 0;
for (size_t idx = 0; idx < cx; cx_char++) {
CodePoint u = line.data[idx++];
if (likely(u < 0x80)) {
if (likely(!ascii_iscntrl(u))) {
w++;
} else if (u == '\t') {
w = next_indent_width(w, tw);
} else {
w += 2;
}
} else {
idx--;
u = u_get_nonascii(line.data, line.length, &idx);
w += u_char_width(u);
}
}
view->cx = cx;
view->cx_char = cx_char;
view->cx_display = w;
}
static bool view_is_cursor_visible(const View *v)
{
return v->cy < v->vy || v->cy > v->vy + v->window->edit_h - 1;
}
static void view_center_to_cursor(View *v)
{
size_t lines = v->buffer->nl;
Window *window = v->window;
unsigned int hh = window->edit_h / 2;
if (window->edit_h >= lines || v->cy < hh) {
v->vy = 0;
return;
}
v->vy = v->cy - hh;
if (v->vy + window->edit_h > lines) {
// -1 makes one ~ line visible so that you know where the EOF is
v->vy -= v->vy + window->edit_h - lines - 1;
}
}
static void view_update_vx(View *v)
{
Window *window = v->window;
unsigned int c = 8;
if (v->cx_display - v->vx >= window->edit_w) {
v->vx = (v->cx_display - window->edit_w + c) / c * c;
}
if (v->cx_display < v->vx) {
v->vx = v->cx_display / c * c;
}
}
static void view_update_vy(View *v, unsigned int scroll_margin)
{
Window *window = v->window;
int margin = window_get_scroll_margin(window, scroll_margin);
long max_y = v->vy + window->edit_h - 1 - margin;
if (v->cy < v->vy + margin) {
v->vy = MAX(v->cy - margin, 0);
} else if (v->cy > max_y) {
v->vy += v->cy - max_y;
max_y = v->buffer->nl - window->edit_h + 1;
if (v->vy > max_y && max_y >= 0) {
v->vy = max_y;
}
}
}
void view_update(View *v, unsigned int scroll_margin)
{
view_update_vx(v);
if (v->force_center || (v->center_on_scroll && view_is_cursor_visible(v))) {
view_center_to_cursor(v);
} else {
view_update_vy(v, scroll_margin);
}
v->force_center = false;
v->center_on_scroll = false;
}
long view_get_preferred_x(View *v)
{
if (v->preferred_x < 0) {
view_update_cursor_x(v);
v->preferred_x = v->cx_display;
}
return v->preferred_x;
}
bool view_can_close(const View *view)
{
const Buffer *buffer = view->buffer;
return !buffer_modified(buffer) || buffer->views.count > 1;
}
StringView view_do_get_word_under_cursor(const View *view, size_t *offset_in_line)
{
StringView line;
size_t si = fetch_this_line(&view->cursor, &line);
while (si < line.length) {
size_t i = si;
if (u_is_word_char(u_get_char(line.data, line.length, &i))) {
break;
}
si = i;
}
if (si == line.length) {
*offset_in_line = 0;
return string_view(NULL, 0);
}
size_t ei = si;
while (si > 0) {
size_t i = si;
if (!u_is_word_char(u_prev_char(line.data, &i))) {
break;
}
si = i;
}
while (ei < line.length) {
size_t i = ei;
if (!u_is_word_char(u_get_char(line.data, line.length, &i))) {
break;
}
ei = i;
}
*offset_in_line = si;
return string_view(line.data + si, ei - si);
}
StringView view_get_word_under_cursor(const View *view)
{
size_t offset_in_line;
return view_do_get_word_under_cursor(view, &offset_in_line);
}
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