/* This file is dedicated to the public domain. * * Convert gemtext to HTML. Only accepts input on stdin. */ #include #include typedef enum { STATE_NORMAL, STATE_BLOCKQUOTE, STATE_NEWLINE, STATE_NEWLINE_EQUALS, STATE_NEWLINE_EQUALS_ARROW, STATE_BEFORE_URL, STATE_IN_URL, STATE_BEFORE_URL_NAME, STATE_URL_NAME, STATE_SINGLE_BACKTICK, STATE_DOUBLE_BACKTICK, STATE_PRE_START, STATE_IN_PRE, STATE_PRE_SINGLE_BACKTICK, STATE_PRE_DOUBLE_BACKTICK, STATE_SKIP_LINE, STATE_HASH, STATE_DOUBLE_HASH, STATE_AFTER_HASH, STATE_AFTER_DOUBLE_HASH, STATE_AFTER_TRIPLE_HASH } ParseState; static ParseState state = STATE_NEWLINE; static ParseState prev_state = STATE_NORMAL; int main(void) { int c; #define BUFSIZE 4096 char urlbuf[BUFSIZE + 1]; char *urlp; urlp = urlbuf; printf(""); #define SET_STATE(s) do { \ prev_state = state; \ state = s; \ } while (0) #define REDO_NORMAL do { \ SET_STATE(STATE_NORMAL); \ goto normal; \ } while (0) while ((c = getc(stdin)) != EOF) { switch (state) { case STATE_NORMAL: case STATE_BLOCKQUOTE: case STATE_IN_PRE: case STATE_PRE_START: case STATE_SKIP_LINE: case STATE_URL_NAME: case STATE_AFTER_HASH: case STATE_AFTER_DOUBLE_HASH: case STATE_AFTER_TRIPLE_HASH: normal: switch (c) { case '\r': break; case '\n': if (state == STATE_BLOCKQUOTE) { fputs("", stdout); } else if (state == STATE_PRE_START) { fputs("\">", stdout); SET_STATE(STATE_IN_PRE); } else if (state == STATE_URL_NAME) { fputs("", stdout); fputs("
", stdout); } else if (state == STATE_AFTER_HASH) { fputs("", stdout); } else if (state == STATE_AFTER_DOUBLE_HASH) { fputs("", stdout); } else if (state == STATE_AFTER_TRIPLE_HASH) { fputs("", stdout); } else if (state == STATE_SKIP_LINE) { } else { fputs("
", stdout); } SET_STATE(STATE_NEWLINE); break; case '<': fputs("<", stdout); break; case '>': fputs(">", stdout); break; case '&': fputs("&", stdout); break; default: if (state != STATE_SKIP_LINE) putchar(c); break; } break; case STATE_NEWLINE: if (prev_state == STATE_IN_PRE) { if (c == '`') { SET_STATE(STATE_PRE_SINGLE_BACKTICK); break; } else { SET_STATE(STATE_IN_PRE); goto normal; } } switch (c) { case '=': SET_STATE(STATE_NEWLINE_EQUALS); break; case '>': SET_STATE(STATE_BLOCKQUOTE); printf("

"); break; case '`': SET_STATE(STATE_SINGLE_BACKTICK); break; case '#': SET_STATE(STATE_HASH); break; default: REDO_NORMAL; } break; case STATE_NEWLINE_EQUALS: if (c == '>') { SET_STATE(STATE_NEWLINE_EQUALS_ARROW); } else { putchar('='); REDO_NORMAL; } break; case STATE_NEWLINE_EQUALS_ARROW: if (c == ' ') { state = STATE_BEFORE_URL; } else { putchar('='); REDO_NORMAL; } break; case STATE_BEFORE_URL: if (c == ' ') { continue; break; } else { fputs("", stdout); *urlp = '\0'; SET_STATE(STATE_BEFORE_URL_NAME); break; case '\n': *urlp = '\0'; fputs("\">", stdout); fputs(urlbuf, stdout); fputs("
", stdout); SET_STATE(STATE_NEWLINE); break; default: if (urlp < &urlbuf[BUFSIZE] && c != '>' && c != '<') *urlp++ = c; putchar(c); } break; case STATE_BEFORE_URL_NAME: if (c != ' ' && c != '\t') { SET_STATE(STATE_URL_NAME); goto normal; } break; case STATE_SINGLE_BACKTICK: case STATE_PRE_SINGLE_BACKTICK: if (c == '`') { SET_STATE(state == STATE_SINGLE_BACKTICK ? STATE_DOUBLE_BACKTICK : STATE_PRE_DOUBLE_BACKTICK); } else { putchar('`'); REDO_NORMAL; } break; case STATE_DOUBLE_BACKTICK: case STATE_PRE_DOUBLE_BACKTICK: if (c == '`') { if (state == STATE_DOUBLE_BACKTICK) { SET_STATE(STATE_PRE_START); fputs("
", stdout);
					SET_STATE(STATE_SKIP_LINE);
				}
			} else {
				fputs("``", stdout);
				if (state == STATE_DOUBLE_BACKTICK) {
					REDO_NORMAL;
				} else {
					SET_STATE(STATE_IN_PRE);
					goto normal;
				}
			}
			break;
		case STATE_HASH:
			if (c == '#') {
				SET_STATE(STATE_DOUBLE_HASH);
			} else {
				fputs("", stdout);
				SET_STATE(STATE_AFTER_HASH);
				goto normal;
			}
			break;
		case STATE_DOUBLE_HASH:
			if (c == '#') {
				fputs("
", stdout);
				SET_STATE(STATE_AFTER_TRIPLE_HASH);
			} else {
				fputs("
", stdout);
				SET_STATE(STATE_AFTER_DOUBLE_HASH);
				goto normal;
			}
			break;
		}
	}
	exit(0);
}

", stdout); SET_STATE(STATE_AFTER_HASH); goto normal; } break; case STATE_DOUBLE_HASH: if (c == '#') { fputs("

", stdout); SET_STATE(STATE_AFTER_TRIPLE_HASH); } else { fputs("

", stdout); SET_STATE(STATE_AFTER_DOUBLE_HASH); goto normal; } break; } } exit(0); }