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https://github.com/ascii-boxes/boxes.git
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495 lines
13 KiB
Plaintext
495 lines
13 KiB
Plaintext
%{
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/*
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* File: lexer.l
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* Date created: March 15, 1999 (Monday, 17:16h)
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* Author: Copyright (C) 1999 Thomas Jensen <boxes@thomasjensen.com>
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* Version: $Id: lexer.l,v 1.17 1999/08/20 19:51:12 tsjensen Exp tsjensen $
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* Language: lex (ANSI C)
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* Purpose: flex lexical analyzer for boxes configuration files
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*
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* Remarks: o This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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* o This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* o You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the Free
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* Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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* - We don't use the yylineno %option. It is not only inefficient,
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* but also doesn't work. :-| *doh*
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*
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* Revision History:
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*
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* $Log: lexer.l,v $
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* Revision 1.17 1999/08/20 19:51:12 tsjensen
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* Moved contents of YY_USER_INIT definition into a separate function which
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* is now called by YY_USER_INIT (better readability)
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*
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* Revision 1.16 1999/08/18 18:23:41 tsjensen
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* Declared yyerrcnt to be static
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* Added YY_USER_INIT macro to set the input buffer size to the config file
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* size (plus a bit). This is supposed to be a workaround for the REJECT
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* problem.
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*
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* Revision 1.15 1999/08/18 15:40:10 tsjensen
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* Added %options never-interactive and caseless
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* Added code for DELIMITER statements
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* Rewrote string rules to deal with delimiter statements
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*
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* Revision 1.14 1999/08/16 16:28:03 tsjensen
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* Implemented new SAMPLE block syntax
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* Replaced states SAMPLE1 and SAMPLE2 with new state SAMPLE - this is now
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* much simpler code
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*
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* Revision 1.13 1999/07/22 12:21:14 tsjensen
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* Added GNU GPL disclaimer
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* Renamed y.tab.h include to parser.h (same file)
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* Renamed parser.h include to lexer.h (same file)
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* Added config.h include
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*
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* Revision 1.12 1999/07/02 11:58:15 tsjensen
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* Added begin_speedmode() which is called by parser.y
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* Added state SPEEDMODE for fast skipping of designs
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* Introduced definitions for PWORD, PBOX, and PWHITE (whitespace)
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* Added %options nounput and noyywrap for easier compilation/linking
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*
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* Revision 1.11 1999/06/28 18:37:38 tsjensen
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* Replaced DEBUG macro with LEXER_DEBUG, which is now activated in boxes.h
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* New tokens to, with, global, once
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* Added LEX_MAX_WARN macro to limit number of lex errors printed per design
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* Replaced exit()s with return YUNREC where errors are not fatal
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*
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* Revision 1.10 1999/06/28 12:17:46 tsjensen
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* Added tokens YBOX and YEND (thus, BOX and END are no longer YKEYWORDs)
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* Added #define FILE_LEXER_L around #include boxes.h to please compiler
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*
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* Revision 1.9 1999/06/22 12:00:05 tsjensen
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* Added #undef DEBUG, because DEBUGging is now activated in boxes.h
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* Added #include tools.h
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*
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* Revision 1.8 1999/06/20 14:17:58 tsjensen
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* Added "padding" keyword and recognition of numbers (YNUMBER)
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*
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* Revision 1.7 1999/06/17 19:05:46 tsjensen
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* Bugfix: Sample block analysis didn't handle empty blocks
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*
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* Revision 1.6 1999/06/14 12:13:41 tsjensen
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* Added Reverse pattern
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*
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* Revision 1.4 1999/04/09 13:31:13 tsjensen
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* Removed all code related to OFFSET blocks (obsolete)
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*
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* Revision 1.3 1999/04/04 16:11:39 tsjensen
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* Added indent keyword
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* Added Replace token
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* Some fiddling which will hopefully fix a line counting bug
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*
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* Revision 1.1 1999/03/18 15:09:48 tsjensen
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* Initial revision
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*/
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#include "config.h"
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "shape.h"
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#define FILE_LEXER_L
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#include "boxes.h"
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#undef FILE_LEXER_L
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#include "tools.h"
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#include "parser.h"
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#include "lexer.h"
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#define LEX_MAX_WARN 3 /* number of lex errors per design */
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static const char rcsid_lexer_l[] =
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"$Id: lexer.l,v 1.17 1999/08/20 19:51:12 tsjensen Exp tsjensen $";
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int yylineno = 1;
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static int yyerrcnt = 0;
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static char sdel = '\"';
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static char sesc = '\\';
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/*
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* User-defined initializations for the lexer
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*/
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static void inflate_inbuf();
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#define YY_USER_INIT inflate_inbuf()
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%}
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%option nounput
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%option noyywrap
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%option never-interactive
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%option caseless
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%option noyylineno
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%x SAMPLE
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%x SPEEDMODE
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%x DELWORD
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%s SHAPES
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%s ELASTIC
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PWORD [a-zA-Z<><5A><EFBFBD><EFBFBD><EFBFBD><EFBFBD>][a-zA-Z0-9\-_<><5F><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>]*
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PWHITE [\n \r\t]
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PBOX Box
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SDELIM [\"~\'`!@\%\&\*=:;<>\?/|\.\\]
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%%
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<DELWORD,SHAPES,ELASTIC,INITIAL>[ \r\t] /* ignore whitespace */
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<DELWORD,SHAPES,ELASTIC,INITIAL>\n ++yylineno;
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<DELWORD>[^ \t\r\n]+ {
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/*
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* String delimiter spec - like WORD, but allow any character
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*/
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\nYDELWOR: %s -- STATE INITIAL", yytext);
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#endif
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yylval.s = (char *) strdup (yytext);
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if (yylval.s == NULL) {
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perror (PROJECT);
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exit (EXIT_FAILURE);
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}
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BEGIN INITIAL;
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return YDELWORD;
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}
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{SDELIM}.*$ {
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/*
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* Strings -- first match everything starting from a potential
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* string delimiter until the end of the line. We will give back what
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* we don't need and also detect unterminated strings.
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*/
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char *p;
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int rest_len = yyleng - 1; /* length of string pointed to by p */
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int qcnt = 0; /* esc char count in current string */
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if (yytext[0] != sdel) {
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REJECT; /* that was not our delimiter */
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}
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yylval.s = (char *) strdup (yytext + 1);
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if (yylval.s == NULL) {
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perror (PROJECT);
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exit (EXIT_FAILURE);
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}
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p = yylval.s;
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while (*p) {
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if (*p == sesc) {
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memmove (p, p+1, rest_len); /* incl. '\0' */
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++qcnt;
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--rest_len;
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if (*p == '\0')
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break;
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}
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else if (*p == sdel) {
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*p = '\0';
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yyless ((p-yylval.s)+2+qcnt); /* string plus quotes */
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\n STRING: \"%s\"", yylval.s);
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#endif
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return STRING;
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}
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--rest_len;
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++p;
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}
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if (yyerrcnt++ < 5)
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yyerror ("Unterminated String -- %s", yytext);
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return YUNREC;
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}
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Sample {
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\nYSAMPLE: %s -- STATE SAMPLE", yytext);
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#endif
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BEGIN SAMPLE;
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return YSAMPLE;
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}
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<SAMPLE>\n {
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++yylineno;
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if (yyleng > 1)
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yymore();
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}
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<SAMPLE>^[ \t]*ends[ \t\r]*$ {
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char *p = yytext + yyleng -1;
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size_t len; /* length of sample */
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while (*p == ' ' || *p == '\t' || *p == '\r')
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--p; /* skip trailing whitespace */
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p -= 2; /* almost skip "ends" statement */
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*p = '\0'; /* p now points to 'n' */
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yylval.s = (char *) strdup (yytext);
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if (yylval.s == NULL) {
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perror (PROJECT);
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exit (EXIT_FAILURE);
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}
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*p-- = 'n';
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len = p - yytext; /* yyless(n): push back all but the first n */
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yyless (len); /* allow him to return YENDSAMPLE */
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yylval.s[len] = '\n'; /* replace 'e' with newline */
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btrim (yylval.s, &len);
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if (len > 0) {
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strcat (yylval.s, "\n"); /* memory was allocated with strdup */
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\n STRING: \"%s\" -- STATE INITIAL", yylval.s);
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#endif
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BEGIN INITIAL;
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return STRING;
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}
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else {
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if (yyerrcnt++ < 5)
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yyerror ("SAMPLE block must not be empty");
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BFREE (yylval.s);
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return YUNREC;
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}
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}
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<SAMPLE>. yymore();
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ends[ \t\r]*$ {
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\nYENDSAM: %s", yytext);
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#endif
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return YENDSAMPLE;
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}
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Elastic {
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\nYELASTC: %s -- STATE ELASTIC", yytext);
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#endif
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BEGIN ELASTIC;
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return YELASTIC;
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}
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Shapes {
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\nYSHAPES: %s -- STATE SHAPES", yytext);
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#endif
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BEGIN SHAPES;
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return YSHAPES;
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}
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{PBOX} {
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\n YBOX: %s", yytext);
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#endif
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yyerrcnt = 0;
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return YBOX;
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}
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Replace { return YREPLACE; }
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Reverse { return YREVERSE; }
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Padding { return YPADDING; }
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End { return YEND; }
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To { return YTO; }
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With { return YWITH; }
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Global { yylval.c = 'g'; return YRXPFLAG; }
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Once { yylval.c = 'o'; return YRXPFLAG; }
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<SHAPES,ELASTIC>nw { yylval.shape = NW; return SHAPE; }
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<SHAPES,ELASTIC>nnw { yylval.shape = NNW; return SHAPE; }
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<SHAPES,ELASTIC>n { yylval.shape = N; return SHAPE; }
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<SHAPES,ELASTIC>nne { yylval.shape = NNE; return SHAPE; }
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<SHAPES,ELASTIC>ne { yylval.shape = NE; return SHAPE; }
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<SHAPES,ELASTIC>ene { yylval.shape = ENE; return SHAPE; }
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<SHAPES,ELASTIC>e { yylval.shape = E; return SHAPE; }
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<SHAPES,ELASTIC>ese { yylval.shape = ESE; return SHAPE; }
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<SHAPES,ELASTIC>se { yylval.shape = SE; return SHAPE; }
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<SHAPES,ELASTIC>sse { yylval.shape = SSE; return SHAPE; }
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<SHAPES,ELASTIC>s { yylval.shape = S; return SHAPE; }
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<SHAPES,ELASTIC>ssw { yylval.shape = SSW; return SHAPE; }
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<SHAPES,ELASTIC>sw { yylval.shape = SW; return SHAPE; }
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<SHAPES,ELASTIC>wsw { yylval.shape = WSW; return SHAPE; }
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<SHAPES,ELASTIC>w { yylval.shape = W; return SHAPE; }
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<SHAPES,ELASTIC>wnw { yylval.shape = WNW; return SHAPE; }
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<ELASTIC>\) {
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\n SYMBOL: \'%c\' -- STATE INITIAL", yytext[0]);
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#endif
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BEGIN INITIAL;
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return yytext[0];
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}
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<SHAPES>\} {
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\n SYMBOL: \'%c\' -- STATE INITIAL", yytext[0]);
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#endif
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BEGIN INITIAL;
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return yytext[0];
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}
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author|created|revision|revdate|indent {
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/*
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* general key words
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*/
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\nKEYWORD: %s", yytext);
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#endif
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yylval.s = (char *) strdup (yytext);
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if (yylval.s == NULL) {
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perror (PROJECT);
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exit (EXIT_FAILURE);
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}
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return KEYWORD;
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}
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Delimiter|Delim {
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/*
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* Change string delimiting characters
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*/
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\nYCHGDEL: %s -- STATE DELWORD", yytext);
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#endif
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BEGIN DELWORD;
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return YCHGDEL;
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}
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{PWORD} {
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\n WORD: %s", yytext);
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#endif
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yylval.s = (char *) strdup (yytext);
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if (yylval.s == NULL) {
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perror (PROJECT);
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exit (EXIT_FAILURE);
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}
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return WORD;
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}
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[\+-]?[0-9]+ {
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\nYNUMBER: %s", yytext);
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#endif
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yylval.num = atoi (yytext);
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return YNUMBER;
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}
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[,(){}] {
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\n SYMBOL: \'%c\'", yytext[0]);
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#endif
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return yytext[0];
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}
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#.*$ {
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/* ignore comments */
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\nCOMMENT: %s", yytext+1);
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#endif
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}
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. {
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if (yyerrcnt++ < LEX_MAX_WARN)
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yyerror ("Unrecognized input char \'%s\'", yytext);
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return YUNREC;
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}
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<SPEEDMODE>{PBOX}{PWHITE}+{PWORD} {
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\n STATUS: %s -- STATE INITIAL", yytext);
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#endif
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yyless (0);
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speeding = 0;
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BEGIN INITIAL;
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}
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<SPEEDMODE>\n ++yylineno;
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<SPEEDMODE>. /* ignore anything else */
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%%
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static void inflate_inbuf()
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/*
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* User-defined initializations for the lexer.
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*
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* Since this scanner must use REJECT in order to be able to process the
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* string delimiter commands, it cannot dynamically enlarge its input
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* buffer to accomodate larger tokens. Thus, we simply set the buffer size
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* to the input file size plus 10 bytes margin-of-error.
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*/
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{
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struct stat sinf;
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if (stat(yyfilename, &sinf)) {
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perror (PROJECT);
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exit (EXIT_FAILURE);
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}
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yy_delete_buffer (YY_CURRENT_BUFFER);
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yy_switch_to_buffer (yy_create_buffer (yyin, sinf.st_size+10));
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}
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void begin_speedmode()
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{
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\n STATUS: begin_speedmode() -- STATE SPEEDMODE");
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#endif
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BEGIN SPEEDMODE;
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}
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void chg_strdelims (const char asesc, const char asdel)
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{
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#ifdef LEXER_DEBUG
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fprintf (stderr, "\n STATUS: chg_strdelims ('%c', '%c')", asesc, asdel);
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#endif
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sesc = asesc;
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sdel = asdel;
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}
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/*EOF*/ /* vim: set cindent sw=4: */
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