bilbo/saturn-examples
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editor: fix off-by-one error

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This fixes multiple comparisons between the buffer length and the
cursor row.

Also refactor the key-binding logic for better flexibility.
This commit is contained in:
Zack Buhman 2023-06-09 00:59:19 +00:00
parent c86fcbd6af
commit d313bdd855
2 changed files with 126 additions and 34 deletions
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29
editor/editor.hpp
View File

@ -18,6 +18,11 @@ struct cursor {
int32_t col;
};
enum struct mode {
normal,
mark
};
template <int C, int R>
struct buffer {
line<C> row[R];
@ -31,6 +36,8 @@ struct buffer {
int32_t left;
} window;
struct cursor cursor;
struct cursor mark;
enum mode mode;
typedef line<C> line_type;
@ -49,6 +56,8 @@ struct buffer {
inline constexpr bool cursor_home();
inline constexpr bool cursor_end();
inline constexpr bool enter();
inline constexpr void set_mark();
inline constexpr void quit();
private:
inline constexpr void scroll_left();
inline constexpr void scroll_right();
@ -217,7 +226,7 @@ inline constexpr bool buffer<C, R>::cursor_right()
line<C> const * const l = this->lines[cur.row];
int32_t length = (l == nullptr) ? 0 : l->length;
if (cur.col >= length) {
if (cur.row >= this->length)
if (cur.row >= (this->length - 1))
return false;
cur.row++;
@ -256,7 +265,7 @@ inline constexpr bool buffer<C, R>::cursor_down()
{
struct cursor& cur = this->cursor;
if (cur.row >= this->length)
if (cur.row >= (this->length - 1))
return false;
cur.row++;
@ -305,7 +314,7 @@ inline constexpr bool buffer<C, R>::enter()
if (cur.row >= R || cur.row < 0)
return false;
if (this->length > cur.row) {
if ((this->length - 1) > cur.row) {
// first, move all lines down one
int32_t n_lines = this->length - (cur.row + 1);
// don't care about nullptr here, this never dereferences
@ -338,6 +347,20 @@ inline constexpr bool buffer<C, R>::enter()
return true;
}
template <int C, int R>
inline constexpr void buffer<C, R>::set_mark()
{
this->mark.row = this->cursor.row;
this->mark.col = this->cursor.col;
this->mode = mode::mark;
}
template <int C, int R>
inline constexpr void buffer<C, R>::quit()
{
this->mode = mode::normal;
}
template <int C, int R>
inline constexpr void buffer<C, R>::scroll_up()
{

131
editor/main_saturn.cpp
View File

@ -20,13 +20,21 @@ constexpr int32_t viewport_max_row = 240 / 8;
static buffer_type buffer {viewport_max_col, viewport_max_row};
constexpr inline uint16_t rgb15(int32_t r, int32_t g, int32_t b)
{
return ((b & 31) << 10) | ((g & 31) << 5) | ((r & 31) << 0);
}
void palette_data()
{
vdp2.cram.u16[1 + 0 ] = 0;
vdp2.cram.u16[2 + 0 ] = 0x7fff;
vdp2.cram.u16[1 + 0 ] = rgb15( 0, 0, 0);
vdp2.cram.u16[2 + 0 ] = rgb15(31, 31, 31);
vdp2.cram.u16[1 + 16] = 0x7fff;
vdp2.cram.u16[2 + 16] = 0;
vdp2.cram.u16[1 + 16] = rgb15(31, 31, 31);
vdp2.cram.u16[2 + 16] = rgb15( 0, 0, 0);
vdp2.cram.u16[1 + 32] = rgb15(15, 15, 15);
vdp2.cram.u16[2 + 32] = rgb15(31, 31, 31);
}
namespace pix_fmt_4bpp
@ -64,42 +72,103 @@ void cell_data()
}
}
struct modifiers {
uint8_t left_shift;
uint8_t right_shift;
enum modifier {
MODIFIER_NONE = 0,
MODIFIER_LEFT_SHIFT = (1 << 0),
MODIFIER_RIGHT_SHIFT = (1 << 1),
MODIFIER_BOTH_SHIFT = MODIFIER_LEFT_SHIFT | MODIFIER_RIGHT_SHIFT,
MODIFIER_LEFT_CTRL = (1 << 2),
MODIFIER_RIGHT_CTRL = (1 << 3),
MODIFIER_BOTH_CTRL = MODIFIER_LEFT_CTRL | MODIFIER_RIGHT_CTRL,
MODIFIER_LEFT_ALT = (1 << 4),
MODIFIER_RIGHT_ALT = (1 << 5),
MODIFIER_BOTH_ALT = MODIFIER_LEFT_ALT | MODIFIER_RIGHT_ALT,
};
static modifiers modifier_state = { 0 };
static uint32_t modifier_state = 0;
inline void keyboard_regular_key(const enum keysym k)
{
switch (modifier_state) {
case MODIFIER_NONE:
switch (k) {
case keysym::BACKSPACE : buffer.backspace(); break;
case keysym::ARROW_LEFT : buffer.cursor_left(); break;
case keysym::ARROW_RIGHT: buffer.cursor_right(); break;
case keysym::ARROW_UP : buffer.cursor_up(); break;
case keysym::ARROW_DOWN : buffer.cursor_down(); break;
case keysym::HOME : buffer.cursor_home(); break;
case keysym::END : buffer.cursor_end(); break;
case keysym::ENTER : buffer.enter(); break;
default:
{
uint8_t c = keysym_to_char(k, false);
if (c != -1) buffer.put(c);
}
break;
}
break;
case MODIFIER_LEFT_SHIFT: [[fallthrough]];
case MODIFIER_RIGHT_SHIFT: [[fallthrough]];
case MODIFIER_BOTH_SHIFT:
switch (k) {
default:
{
uint8_t c = keysym_to_char(k, true);
if (c != -1) buffer.put(c);
}
break;
}
break;
case MODIFIER_LEFT_CTRL: [[fallthrough]];
case MODIFIER_RIGHT_CTRL: [[fallthrough]];
case MODIFIER_BOTH_CTRL:
switch (k) {
case keysym::SPACE : buffer.set_mark(); break;
case keysym::G : buffer.quit(); break;
case keysym::B : buffer.cursor_left(); break;
case keysym::F : buffer.cursor_right(); break;
case keysym::P : buffer.cursor_up(); break;
case keysym::N : buffer.cursor_down(); break;
case keysym::A : buffer.cursor_home(); break;
case keysym::E : buffer.cursor_end(); break;
default: break;
}
break;
case MODIFIER_LEFT_ALT: [[fallthrough]];
case MODIFIER_RIGHT_ALT: [[fallthrough]];
case MODIFIER_BOTH_ALT:
break;
default: break;
}
}
void keyboard_callback(const enum keysym k, uint8_t kbd_bits)
{
int32_t shift = modifier_state.left_shift || modifier_state.right_shift;
int32_t c = keysym_to_char(k, shift);
if (KEYBOARD__MAKE(kbd_bits)) {
if (k == keysym::UNKNOWN)
return;
if (c != -1) {
buffer.put(c);
} else {
switch (k) {
case keysym::BACKSPACE : buffer.backspace(); break;
case keysym::ARROW_LEFT : buffer.cursor_left(); break;
case keysym::ARROW_RIGHT: buffer.cursor_right(); break;
case keysym::ARROW_UP : buffer.cursor_up(); break;
case keysym::ARROW_DOWN : buffer.cursor_down(); break;
case keysym::HOME : buffer.cursor_home(); break;
case keysym::END : buffer.cursor_end(); break;
case keysym::ENTER : buffer.enter(); break;
case keysym::LEFT_SHIFT : modifier_state.left_shift = 1; break;
case keysym::RIGHT_SHIFT: modifier_state.right_shift = 1; break;
default: break;
}
switch (k) {
case keysym::LEFT_SHIFT : modifier_state |= MODIFIER_LEFT_SHIFT; break;
case keysym::RIGHT_SHIFT: modifier_state |= MODIFIER_RIGHT_SHIFT; break;
case keysym::LEFT_CTRL : modifier_state |= MODIFIER_LEFT_CTRL; break;
case keysym::RIGHT_CTRL : modifier_state |= MODIFIER_RIGHT_CTRL; break;
case keysym::LEFT_ALT : modifier_state |= MODIFIER_LEFT_ALT; break;
case keysym::RIGHT_ALT : modifier_state |= MODIFIER_RIGHT_ALT; break;
default:
keyboard_regular_key(k);
break;
}
} else if (KEYBOARD__BREAK(kbd_bits)) {
switch (k) {
case keysym::LEFT_SHIFT : modifier_state.left_shift = 0; break;
case keysym::RIGHT_SHIFT: modifier_state.right_shift = 0; break;
case keysym::LEFT_SHIFT : modifier_state &= ~(MODIFIER_LEFT_SHIFT); break;
case keysym::RIGHT_SHIFT: modifier_state &= ~(MODIFIER_RIGHT_SHIFT); break;
case keysym::LEFT_CTRL : modifier_state &= ~(MODIFIER_LEFT_CTRL); break;
case keysym::RIGHT_CTRL : modifier_state &= ~(MODIFIER_RIGHT_CTRL); break;
case keysym::LEFT_ALT : modifier_state &= ~(MODIFIER_LEFT_ALT); break;
case keysym::RIGHT_ALT : modifier_state &= ~(MODIFIER_RIGHT_ALT); break;
default: break;
}
}