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circuitpython/shared-module/terminalio/Terminal.c

124 lines
5.1 KiB

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Scott Shawcroft for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "shared-module/terminalio/Terminal.h"
#include "shared-bindings/displayio/TileGrid.h"
void common_hal_terminalio_terminal_construct(terminalio_terminal_obj_t *self, displayio_tilegrid_t* tilegrid, const uint8_t* unicode_characters, uint16_t unicode_characters_len) {
self->cursor_x = 0;
self->cursor_y = 0;
self->tilegrid = tilegrid;
self->unicode_characters = unicode_characters;
self->unicode_characters_len = unicode_characters_len;
}
size_t common_hal_terminalio_terminal_write(terminalio_terminal_obj_t *self, const byte *data, size_t len, int *errcode) {
const byte* i = data;
uint16_t start_y = self->cursor_y;
while (i < data + len) {
unichar c = utf8_get_char(i);
i = utf8_next_char(i);
// Always handle ASCII.
if (c < 128) {
if (c >= 0x20 && c <= 0x7e) {
common_hal_displayio_textgrid_set_tile(self->tilegrid, self->cursor_x, self->cursor_y, c - 0x20);
self->cursor_x++;
}
if (c == '\r') {
self->cursor_x = 0;
} else if (c == '\n') {
self->cursor_y++;
// Commands below are used by MicroPython in the REPL
} else if (c == '\b') {
if (self->cursor_x > 0) {
self->cursor_x--;
}
} else if (c == 0x1b) {
if (i[0] == '[') {
if (i[1] == 'K') {
// Clear the rest of the line.
for (uint16_t j = self->cursor_x; j < self->tilegrid->width_in_tiles; j++) {
common_hal_displayio_textgrid_set_tile(self->tilegrid, j, self->cursor_y, 0);
}
i += 2;
} else {
// Handle commands of the form \x1b[####D
uint16_t n = 0;
uint8_t j = 1;
for (; j < 6; j++) {
if ('0' <= i[j] && i[j] <= '9') {
n = n * 10 + (i[j] - '0');
} else {
c = i[j];
}
}
if (c == 'D') {
if (n > self->cursor_x) {
self->cursor_x = 0;
} else {
self->cursor_x -= n;
}
i += j;
}
}
}
}
} else {
// Do a linear search of the mapping for unicode.
const byte* j = self->unicode_characters;
uint8_t k = 0;
while (j < self->unicode_characters + self->unicode_characters_len) {
unichar potential_c = utf8_get_char(j);
j = utf8_next_char(j);
if (c == potential_c) {
common_hal_displayio_textgrid_set_tile(self->tilegrid, self->cursor_x, self->cursor_y, 0x7f - 0x20 + k);
self->cursor_x++;
break;
}
}
}
if (self->cursor_x >= self->tilegrid->width_in_tiles) {
self->cursor_y++;
self->cursor_x %= self->tilegrid->width_in_tiles;
}
if (self->cursor_y >= self->tilegrid->height_in_tiles) {
self->cursor_y %= self->tilegrid->height_in_tiles;
}
if (self->cursor_y != start_y) {
// clear the new row
for (uint16_t j = 0; j < self->tilegrid->width_in_tiles; j++) {
common_hal_displayio_textgrid_set_tile(self->tilegrid, j, self->cursor_y, 0);
start_y = self->cursor_y;
}
}
}
return i - data;
}
bool common_hal_terminalio_terminal_ready_to_tx(terminalio_terminal_obj_t *self) {
return true;
}