diff options
Diffstat (limited to 'lib/mp-readline/readline.c')
| -rw-r--r-- | lib/mp-readline/readline.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/lib/mp-readline/readline.c b/lib/mp-readline/readline.c new file mode 100644 index 0000000000..ee2e8ebdae --- /dev/null +++ b/lib/mp-readline/readline.c @@ -0,0 +1,246 @@ +/* + * This file is part of the Micro Python project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2013, 2014 Damien P. George + * + * 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 <stdio.h> +#include <stdint.h> +#include <string.h> + +#include "py/mpstate.h" +#include "readline.h" +#include "pybstdio.h" + +#if 0 // print debugging info +#define DEBUG_PRINT (1) +#define DEBUG_printf printf +#else // don't print debugging info +#define DEBUG_printf(...) (void)0 +#endif + +#define READLINE_HIST_SIZE (MP_ARRAY_SIZE(MP_STATE_PORT(readline_hist))) + +enum { ESEQ_NONE, ESEQ_ESC, ESEQ_ESC_BRACKET, ESEQ_ESC_BRACKET_DIGIT, ESEQ_ESC_O }; + +void readline_init0(void) { + memset(MP_STATE_PORT(readline_hist), 0, READLINE_HIST_SIZE * sizeof(const char*)); +} + +STATIC char *str_dup_maybe(const char *str) { + uint32_t len = strlen(str); + char *s2 = m_new_maybe(char, len + 1); + if (s2 == NULL) { + return NULL; + } + memcpy(s2, str, len + 1); + return s2; +} + +int readline(vstr_t *line, const char *prompt) { + stdout_tx_str(prompt); + int orig_line_len = line->len; + int escape_seq = ESEQ_NONE; + char escape_seq_buf[1] = {0}; + int hist_cur = -1; + int cursor_pos = orig_line_len; + for (;;) { + int c = stdin_rx_chr(); + int last_line_len = line->len; + int redraw_step_back = 0; + bool redraw_from_cursor = false; + int redraw_step_forward = 0; + if (escape_seq == ESEQ_NONE) { + if (CHAR_CTRL_A <= c && c <= CHAR_CTRL_D && vstr_len(line) == orig_line_len) { + // control character with empty line + return c; + } else if (c == CHAR_CTRL_A) { + // CTRL-A with non-empty line is go-to-start-of-line + goto home_key; + } else if (c == CHAR_CTRL_C) { + // CTRL-C with non-empty line is cancel + return c; + } else if (c == CHAR_CTRL_E) { + // CTRL-E is go-to-end-of-line + goto end_key; + } else if (c == '\r') { + // newline + stdout_tx_str("\r\n"); + if (line->len > orig_line_len && (MP_STATE_PORT(readline_hist)[0] == NULL || strcmp(MP_STATE_PORT(readline_hist)[0], line->buf + orig_line_len) != 0)) { + // a line which is not empty and different from the last one + // so update the history + char *most_recent_hist = str_dup_maybe(line->buf + orig_line_len); + if (most_recent_hist != NULL) { + for (int i = READLINE_HIST_SIZE - 1; i > 0; i--) { + MP_STATE_PORT(readline_hist)[i] = MP_STATE_PORT(readline_hist)[i - 1]; + } + MP_STATE_PORT(readline_hist)[0] = most_recent_hist; + } + } + return 0; + } else if (c == 27) { + // escape sequence + escape_seq = ESEQ_ESC; + } else if (c == 8 || c == 127) { + // backspace/delete + if (cursor_pos > orig_line_len) { + vstr_cut_out_bytes(line, cursor_pos - 1, 1); + // set redraw parameters + redraw_step_back = 1; + redraw_from_cursor = true; + } + } else if (32 <= c && c <= 126) { + // printable character + vstr_ins_char(line, cursor_pos, c); + // set redraw parameters + redraw_from_cursor = true; + redraw_step_forward = 1; + } + } else if (escape_seq == ESEQ_ESC) { + switch (c) { + case '[': + escape_seq = ESEQ_ESC_BRACKET; + break; + case 'O': + escape_seq = ESEQ_ESC_O; + break; + default: + DEBUG_printf("(ESC %d)", c); + escape_seq = ESEQ_NONE; + } + } else if (escape_seq == ESEQ_ESC_BRACKET) { + if ('0' <= c && c <= '9') { + escape_seq = ESEQ_ESC_BRACKET_DIGIT; + escape_seq_buf[0] = c; + } else { + escape_seq = ESEQ_NONE; + if (c == 'A') { + // up arrow + if (hist_cur + 1 < READLINE_HIST_SIZE && MP_STATE_PORT(readline_hist)[hist_cur + 1] != NULL) { + // increase hist num + hist_cur += 1; + // set line to history + line->len = orig_line_len; + vstr_add_str(line, MP_STATE_PORT(readline_hist)[hist_cur]); + // set redraw parameters + redraw_step_back = cursor_pos - orig_line_len; + redraw_from_cursor = true; + redraw_step_forward = line->len - orig_line_len; + } + } else if (c == 'B') { + // down arrow + if (hist_cur >= 0) { + // decrease hist num + hist_cur -= 1; + // set line to history + vstr_cut_tail_bytes(line, line->len - orig_line_len); + if (hist_cur >= 0) { + vstr_add_str(line, MP_STATE_PORT(readline_hist)[hist_cur]); + } + // set redraw parameters + redraw_step_back = cursor_pos - orig_line_len; + redraw_from_cursor = true; + redraw_step_forward = line->len - orig_line_len; + } + } else if (c == 'C') { + // right arrow + if (cursor_pos < line->len) { + redraw_step_forward = 1; + } + } else if (c == 'D') { + // left arrow + if (cursor_pos > orig_line_len) { + redraw_step_back = 1; + } + } else if (c == 'H') { + // home + goto home_key; + } else if (c == 'F') { + // end + goto end_key; + } else { + DEBUG_printf("(ESC [ %d)", c); + } + } + } else if (escape_seq == ESEQ_ESC_BRACKET_DIGIT) { + if (c == '~') { + if (escape_seq_buf[0] == '1' || escape_seq_buf[0] == '7') { +home_key: + redraw_step_back = cursor_pos - orig_line_len; + } else if (escape_seq_buf[0] == '4' || escape_seq_buf[0] == '8') { +end_key: + redraw_step_forward = line->len - cursor_pos; + } else { + DEBUG_printf("(ESC [ %c %d)", escape_seq_buf[0], c); + } + } else { + DEBUG_printf("(ESC [ %c %d)", escape_seq_buf[0], c); + } + escape_seq = ESEQ_NONE; + } else if (escape_seq == ESEQ_ESC_O) { + switch (c) { + case 'H': + goto home_key; + case 'F': + goto end_key; + default: + DEBUG_printf("(ESC O %d)", c); + escape_seq = ESEQ_NONE; + } + } else { + escape_seq = ESEQ_NONE; + } + + // redraw command prompt, efficiently + // TODO we can probably use some more sophisticated VT100 commands here + if (redraw_step_back > 0) { + for (int i = 0; i < redraw_step_back; i++) { + stdout_tx_str("\b"); + } + cursor_pos -= redraw_step_back; + } + if (redraw_from_cursor) { + if (line->len < last_line_len) { + // erase old chars + for (int i = cursor_pos; i < last_line_len; i++) { + stdout_tx_str(" "); + } + // step back + for (int i = cursor_pos; i < last_line_len; i++) { + stdout_tx_str("\b"); + } + } + // draw new chars + stdout_tx_strn(line->buf + cursor_pos, line->len - cursor_pos); + // move cursor forward if needed (already moved forward by length of line, so move it back) + for (int i = cursor_pos + redraw_step_forward; i < line->len; i++) { + stdout_tx_str("\b"); + } + cursor_pos += redraw_step_forward; + } else if (redraw_step_forward > 0) { + // draw over old chars to move cursor forwards + stdout_tx_strn(line->buf + cursor_pos, redraw_step_forward); + cursor_pos += redraw_step_forward; + } + } +} |