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160 lines
3.0 KiB
160 lines
3.0 KiB
#include <esp8266.h>
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#include "ansi_parser.h"
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/* Ragel constants block */
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%%{
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machine ansi;
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write data;
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}%%
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/**
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* \brief Linear ANSI chars stream parser
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*
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* Parses a stream of bytes using a Ragel parser. The defined
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* grammar does not use 'unget', so the entire buffer is
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* always processed in a linear manner.
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*
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* \attention -> but always check the Ragel output for 'p--'
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* or 'p -=', that means trouble.
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*
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* \param newdata - array of new chars to process
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* \param len - length of the newdata buffer
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*/
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void ICACHE_FLASH_ATTR
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ansi_parser(const char *newdata, size_t len)
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{
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static int cs = -1;
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// The CSI code is built here
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static char csi_leading; //!< Leading char, 0 if none
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static int csi_ni; //!< Number of the active digit
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static int csi_n[CSI_N_MAX]; //!< Param digits
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static char csi_char; //!< CSI action char (end)
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if (len == 0) len = strlen(newdata);
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// Load new data to Ragel vars
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const char *p = newdata;
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const char *eof = NULL;
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const char *pe = newdata + len;
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// Init Ragel on the first run
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if (cs == -1) {
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%% write init;
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}
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// The parser
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%%{
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ESC = 27;
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NOESC = (any - ESC);
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TOK_ST = ESC '\\'; # String terminator - used for OSC commands
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# --- Regular characters to be printed ---
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action plain_char {
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apars_handle_plainchar(fc);
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}
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# --- CSI CSI commands (Select Graphic Rendition) ---
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# Text color & style
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action CSI_start {
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/* Reset the CSI builder */
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csi_leading = csi_char = 0;
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csi_ni = 0;
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/* Zero out digits */
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for(int i = 0; i < CSI_N_MAX; i++) {
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csi_n[i] = 0;
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}
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fgoto CSI_body;
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}
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action CSI_leading {
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csi_leading = fc;
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}
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action CSI_digit {
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/* x10 + digit */
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if (csi_ni < CSI_N_MAX) {
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csi_n[csi_ni] = csi_n[csi_ni]*10 + (fc - '0');
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}
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}
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action CSI_semi {
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csi_ni++;
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}
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action CSI_end {
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csi_char = fc;
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apars_handle_CSI(csi_leading, csi_n, csi_char);
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fgoto main;
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}
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action errBadSeq {
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apars_handle_badseq();
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fgoto main;
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}
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action back2main {
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fgoto main;
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}
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CSI_body := ((32..47|60..64) @CSI_leading)?
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((digit @CSI_digit)* ';' @CSI_semi)*
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(digit @CSI_digit)* alpha @CSI_end $!errBadSeq;
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# --- OSC commands (Operating System Commands) ---
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# Module parametrisation
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action OSC_start {
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csi_ni = 0;
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// we reuse the CSI numeric buffer
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for(int i = 0; i < CSI_N_MAX; i++) {
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csi_n[i] = 0;
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}
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fgoto OSC_body;
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}
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action OSC_fr {
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apars_handle_OSC_FactoryReset();
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fgoto main;
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}
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action OSC_resize {
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apars_handle_OSC_SetScreenSize(csi_n[0], csi_n[1]);
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fgoto main;
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}
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OSC_body := (
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("FR" ('\a' | ESC '\\') @OSC_fr) |
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('W' (digit @CSI_digit)+ ';' @CSI_semi (digit @CSI_digit)+ ('\a' | ESC '\\') @OSC_resize)
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) $!errBadSeq;
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action RESET_cmd {
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// Reset screen
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apars_handle_RESET_cmd();
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fgoto main;
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}
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# --- Main parser loop ---
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main :=
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(
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(NOESC @plain_char)* ESC (
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'[' @CSI_start |
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']' @OSC_start |
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'c' @RESET_cmd
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)
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)+ $!errBadSeq;
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write exec;
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}%%
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}
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