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

172 lines
3.2 KiB

#include <esp8266.h>
#include "ansi_parser.h"
/* Ragel constants block */
%%{
machine ansi;
write data;
}%%
/**
* \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(const char *newdata, size_t len)
{
static int cs = -1;
// 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_n[CSI_N_MAX]; //!< Param digits
static char csi_char; //!< CSI action char (end)
if (len == 0) len = strlen(newdata);
// Load new data to Ragel vars
const char *p = newdata;
const char *eof = NULL;
const char *pe = newdata + len;
// Init Ragel on the first run
if (cs == -1) {
%% write init;
}
// The parser
%%{
ESC = 27;
NOESC = (any - ESC);
TOK_ST = ESC '\\'; # String terminator - used for OSC commands
# --- Regular characters to be printed ---
action plain_char {
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;
/* 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 {
/* x10 + digit */
if (csi_ni < CSI_N_MAX) {
csi_n[csi_ni] = csi_n[csi_ni]*10 + (fc - '0');
}
}
action CSI_semi {
csi_ni++;
}
action CSI_end {
csi_char = fc;
apars_handle_CSI(csi_leading, csi_n, csi_char);
fgoto main;
}
action errBadSeq {
apars_handle_badseq();
fgoto main;
}
action back2main {
fgoto main;
}
CSI_body := ((32..47|60..64) @CSI_leading)?
((digit @CSI_digit)* ';' @CSI_semi)*
(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;
}
fgoto OSC_body;
}
action OSC_fr {
apars_handle_OSC_FactoryReset();
fgoto main;
}
action OSC_resize {
apars_handle_OSC_SetScreenSize(csi_n[0], csi_n[1]);
fgoto main;
}
OSC_body := (
("FR" ('\a' | ESC '\\') @OSC_fr) |
('W' (digit @CSI_digit)+ ';' @CSI_semi (digit @CSI_digit)+ ('\a' | ESC '\\') @OSC_resize)
) $!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;
}
# --- Main parser loop ---
main :=
(
(NOESC @plain_char)* ESC (
'[' @CSI_start |
']' @OSC_start |
'c' @RESET_cmd |
'7' @CSI_SaveCursorAttrs |
'8' @CSI_RestoreCursorAttrs
)
)+ $!errBadSeq;
write exec;
}%%
}