ESPTerm - ESP8266 terminal emulator. Branches: [master] patches, [work] next release
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espterm-firmware/user/ansi_parser.rl

365 lines
7.2 KiB

#include <esp8266.h>
#include "ansi_parser.h"
#include "screen.h"
#include "ascii.h"
#include "uart_driver.h"
/* Ragel constants block */
%%{
machine ansi;
write data;
}%%
static volatile int cs = -1;
static volatile bool inside_osc = false;
volatile u32 ansi_parser_char_cnt = 0;
void ICACHE_FLASH_ATTR
ansi_parser_reset(void) {
if (cs != ansi_start) {
cs = ansi_start;
inside_osc = false;
apars_reset_utf8buffer();
ansi_warn("Parser timeout, state reset");
}
}
#define HISTORY_LEN 10
#if DEBUG_ANSI
static char history[HISTORY_LEN + 1];
#endif
void ICACHE_FLASH_ATTR
apars_handle_badseq(void)
{
#if DEBUG_ANSI
char buf1[HISTORY_LEN*3+2];
char buf2[HISTORY_LEN*3+2];
char *b1 = buf1;
char *b2 = buf2;
char c;
for(int i=0;i<HISTORY_LEN;i++) {
c = history[i];
b1 += sprintf(b1, "%2X ", c);
if (c < 32 || c > 127) c = '.';
b2 += sprintf(b2, "%c ", c);
}
ansi_dbg("Context: %s", buf2);
ansi_dbg(" %s", buf1);
#endif
}
/**
* \brief Linear ANSI chars stream parser
*
* Parses a stream of bytes using a Ragel parser. The defined
* grammar does not use 'unget', so the entire buffer is
* always processed in a linear manner.
*
* \attention -> but always check the Ragel output for 'p--'
* or 'p -=', that means trouble.
*
* \param newdata - array of new chars to process
* \param len - length of the newdata buffer
*/
void ICACHE_FLASH_ATTR
ansi_parser(char newchar)
{
// The CSI code is built here
static char csi_leading; //!< Leading char, 0 if none
static int csi_ni; //!< Number of the active digit
static int csi_cnt; //!< Digit count
static int csi_n[CSI_N_MAX]; //!< Param digits
static char csi_char; //!< CSI action char (end)
static char osc_buffer[OSC_CHAR_MAX];
static int osc_bi; // buffer char index
// This is used to detect timeout delay (time since last rx char)
ansi_parser_char_cnt++;
// Init Ragel on the first run
if (cs == -1) {
%% write init;
#if DEBUG_ANSI
memset(history, 0, sizeof(history));
#endif
}
#if DEBUG_ANSI
for(int i=1; i<HISTORY_LEN; i++) {
history[i-1] = history[i];
}
history[HISTORY_LEN-1] = newchar;
#endif
// Handle simple characters immediately (bypass parser)
if (newchar < ' ') {
switch (newchar) {
case ESC:
if (!inside_osc) {
// Reset state
cs = ansi_start;
// now the ESC will be processed by the parser
}
break; // proceed to parser
// Literally passed
case FF:
case VT:
newchar = LF; // translate to LF, like VT100 / xterm do
case CR:
case LF:
case TAB:
case BS:
apars_handle_plainchar(newchar);
return;
// Select G0 or G1
case SI:
screen_set_charset_n(1);
return;
case SO:
screen_set_charset_n(0);
return;
case BEL:
// bel is also used to terminate OSC
if (!inside_osc) {
apars_handle_bel();
return;
}
break;
case ENQ: // respond with space (like xterm)
UART_WriteChar(UART0, SP, UART_TIMEOUT_US);
return;
// Cancel the active sequence
case CAN:
case SUB:
cs = ansi_start;
return;
default:
// Discard all others
return;
}
} else {
// >= ' '
// bypass the parser for simple characters (speed-up)
if (cs == ansi_start) {
apars_handle_plainchar(newchar);
return;
}
}
// Load new data to Ragel vars
const char *p = &newchar;
const char *eof = NULL;
const char *pe = &newchar + 1;
// The parser
%%{
#/*
ESC = 27;
NOESC = (any - ESC);
TOK_ST = ESC '\\'; # String terminator - used for OSC commands
OSC_END = ('\a' | TOK_ST);
# --- Regular characters to be printed ---
action plain_char {
if (fc != 0) {
apars_handle_plainchar(fc);
}
}
# --- CSI CSI commands (Select Graphic Rendition) ---
# Text color & style
action CSI_start {
// Reset the CSI builder
csi_leading = csi_char = 0;
csi_ni = 0;
csi_cnt = 0;
// Zero out digits
for(int i = 0; i < CSI_N_MAX; i++) {
csi_n[i] = 0;
}
fgoto CSI_body;
}
action CSI_leading {
csi_leading = fc;
}
action CSI_digit {
if (csi_cnt == 0) csi_cnt = 1;
// x10 + digit
if (csi_ni < CSI_N_MAX) {
csi_n[csi_ni] = csi_n[csi_ni]*10 + (fc - '0');
}
}
action CSI_semi {
if (csi_cnt == 0) csi_cnt = 1; // handle case when first arg is empty
csi_cnt++;
csi_ni++;
}
action CSI_end {
csi_char = fc;
apars_handle_CSI(csi_leading, csi_n, csi_cnt, csi_char);
fgoto main;
}
action errBadSeq {
ansi_warn("Parser error.");
apars_handle_badseq();
fgoto main;
}
action back2main {
8 years ago
fgoto main;
}
CSI_body := ((32..47|60..64) @CSI_leading)?
((digit @CSI_digit)* ';' @CSI_semi)*
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(digit @CSI_digit)* (alpha|'`'|'@') @CSI_end $!errBadSeq;
# --- OSC commands (Operating System Commands) ---
# Module parametrisation
action OSC_start {
csi_ni = 0;
// we reuse the CSI numeric buffer
for(int i = 0; i < CSI_N_MAX; i++) {
csi_n[i] = 0;
}
osc_bi = 0;
osc_buffer[0] = '\0';
inside_osc = true;
fgoto OSC_body;
}
# collecting title string; this can also be entered by ESC k
action SetTitle_start {
osc_bi = 0;
osc_buffer[0] = '\0';
inside_osc = true;
fgoto TITLE_body;
}
action OSC_resize {
apars_handle_OSC_SetScreenSize(csi_n[0], csi_n[1]);
inside_osc = false;
fgoto main;
}
action OSC_text_char {
osc_buffer[osc_bi++] = fc;
}
action OSC_title {
osc_buffer[osc_bi++] = '\0';
apars_handle_OSC_SetTitle(osc_buffer);
inside_osc = false;
fgoto main;
}
action OSC_button {
osc_buffer[osc_bi++] = '\0';
apars_handle_OSC_SetButton(csi_n[0], osc_buffer);
inside_osc = false;
fgoto main;
}
# 0; is xterm title hack
OSC_body := (
("BTN" digit @CSI_digit '=' (NOESC @OSC_text_char)* OSC_END @OSC_button) |
("TITLE=" @SetTitle_start) |
("0;" @SetTitle_start) |
('W' (digit @CSI_digit)+ ';' @CSI_semi (digit @CSI_digit)+ OSC_END @OSC_resize)
) $!errBadSeq;
TITLE_body := (NOESC @OSC_text_char)* OSC_END @OSC_title $!errBadSeq;
action RESET_cmd {
// Reset screen
apars_handle_RESET_cmd();
fgoto main;
}
action CSI_SaveCursorAttrs {
apars_handle_saveCursorAttrs();
fgoto main;
}
action CSI_RestoreCursorAttrs {
apars_handle_restoreCursorAttrs();
fgoto main;
}
action HASH_code {
apars_handle_hashCode(fc);
fgoto main;
}
action SHORT_code {
apars_handle_shortCode(fc);
fgoto main;
}
action SetXCtrls {
apars_handle_setXCtrls(fc); // weird control settings like 7 bit / 8 bit mode
fgoto main;
}
action CharsetCmd_start {
// abuse the buffer for storing the leading char
osc_buffer[0] = fc;
fgoto charsetcmd_body;
}
action CharsetCmd_end {
apars_handle_characterSet(osc_buffer[0], fc);
fgoto main;
}
charsetcmd_body := (any @CharsetCmd_end) $!errBadSeq;
# --- Main parser loop ---
main :=
(
(NOESC @plain_char)* ESC (
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('[' @CSI_start) |
(']' @OSC_start) |
('#' digit @HASH_code) |
('k' @SetTitle_start) |
([a-jl-zA-Z0-9=<>] @SHORT_code) |
([()*+-./] @CharsetCmd_start) |
(' ' [FG] @SetXCtrls)
)
)+ $!errBadSeq;
write exec;
#*/
}%%
}
// 'ESC k blah OSC_end' is a shortcut for setting title (k is defined in GNU screen as Title Definition String)