Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 1 | /*********************************************************** |
Guido van Rossum | 1d5735e | 1994-08-30 08:27:36 +0000 | [diff] [blame] | 2 | Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum, |
Guido van Rossum | 9bfef44 | 1993-03-29 10:43:31 +0000 | [diff] [blame] | 3 | Amsterdam, The Netherlands. |
Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 4 | |
| 5 | All Rights Reserved |
| 6 | |
| 7 | Permission to use, copy, modify, and distribute this software and its |
| 8 | documentation for any purpose and without fee is hereby granted, |
| 9 | provided that the above copyright notice appear in all copies and that |
| 10 | both that copyright notice and this permission notice appear in |
| 11 | supporting documentation, and that the names of Stichting Mathematisch |
| 12 | Centrum or CWI not be used in advertising or publicity pertaining to |
| 13 | distribution of the software without specific, written prior permission. |
| 14 | |
| 15 | STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO |
| 16 | THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| 17 | FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE |
| 18 | FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 19 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 20 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| 21 | OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 22 | |
| 23 | ******************************************************************/ |
| 24 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 25 | /* Grammar subroutines needed by parser */ |
| 26 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 27 | #include "pgenheaders.h" |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 28 | #include "assert.h" |
| 29 | #include "grammar.h" |
| 30 | #include "token.h" |
| 31 | |
| 32 | /* Return the DFA for the given type */ |
| 33 | |
| 34 | dfa * |
| 35 | finddfa(g, type) |
| 36 | grammar *g; |
| 37 | register int type; |
| 38 | { |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 39 | register dfa *d; |
Guido van Rossum | 6522eb0 | 1994-09-09 11:11:39 +0000 | [diff] [blame] | 40 | #if 1 |
| 41 | /* Massive speed-up */ |
| 42 | d = &g->g_dfa[type - NT_OFFSET]; |
| 43 | assert(d->d_type == type); |
| 44 | return d; |
| 45 | #else |
| 46 | /* Old, slow version */ |
| 47 | register int i; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 48 | |
| 49 | for (i = g->g_ndfas, d = g->g_dfa; --i >= 0; d++) { |
| 50 | if (d->d_type == type) |
| 51 | return d; |
| 52 | } |
| 53 | assert(0); |
| 54 | /* NOTREACHED */ |
Guido van Rossum | 6522eb0 | 1994-09-09 11:11:39 +0000 | [diff] [blame] | 55 | #endif |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 56 | } |
| 57 | |
| 58 | char * |
| 59 | labelrepr(lb) |
| 60 | label *lb; |
| 61 | { |
| 62 | static char buf[100]; |
| 63 | |
| 64 | if (lb->lb_type == ENDMARKER) |
| 65 | return "EMPTY"; |
| 66 | else if (ISNONTERMINAL(lb->lb_type)) { |
| 67 | if (lb->lb_str == NULL) { |
| 68 | sprintf(buf, "NT%d", lb->lb_type); |
| 69 | return buf; |
| 70 | } |
| 71 | else |
| 72 | return lb->lb_str; |
| 73 | } |
| 74 | else { |
| 75 | if (lb->lb_str == NULL) |
| 76 | return tok_name[lb->lb_type]; |
| 77 | else { |
| 78 | sprintf(buf, "%.32s(%.32s)", |
| 79 | tok_name[lb->lb_type], lb->lb_str); |
| 80 | return buf; |
| 81 | } |
| 82 | } |
| 83 | } |