1 files changed, 127 insertions, 0 deletions
diff --git a/shared-module/terminalio/Terminal.c b/shared-module/terminalio/Terminal.c
new file mode 100644
index 000000000..6734fa30e
--- /dev/null
+++ b/shared-module/terminalio/Terminal.c
@@ -0,0 +1,127 @@
+/*
+ * 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-module/displayio/__init__.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, size_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;
+    self->first_row = 0;
+}
+
+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;
+            }
+            common_hal_displayio_textgrid_set_top_left(self->tilegrid, 0, (start_y + self->tilegrid->height_in_tiles + 1) % self->tilegrid->height_in_tiles);
+        }
+    }
+    return i - data;
+}
+
+bool common_hal_terminalio_terminal_ready_to_tx(terminalio_terminal_obj_t *self) {
+    return true;
+}