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818 lines
16 KiB
Plaintext
818 lines
16 KiB
Plaintext
/* parse.y - parser for flex input */
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%token CHAR NUMBER SECTEND SCDECL XSCDECL WHITESPACE NAME PREVCCL EOF_OP
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%{
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Vern Paxson.
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*
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* The United States Government has rights in this work pursuant
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* to contract no. DE-AC03-76SF00098 between the United States
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* Department of Energy and the University of California.
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*
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* Redistribution and use in source and binary forms are permitted provided
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* that: (1) source distributions retain this entire copyright notice and
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* comment, and (2) distributions including binaries display the following
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* acknowledgement: ``This product includes software developed by the
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* University of California, Berkeley and its contributors'' in the
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* documentation or other materials provided with the distribution and in
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* all advertising materials mentioning features or use of this software.
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* Neither the name of the University nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* $Header: /home/daffy/u0/vern/flex/RCS/parse.y,v 2.15 93/12/09 13:57:23 vern Exp $ */
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/* Some versions of bison are broken in that they use alloca() but don't
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* declare it properly. The following is the patented (just kidding!)
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* #ifdef chud to fix the problem, courtesy of Francois Pinard.
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*/
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#ifdef YYBISON
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/* AIX requires this to be the first thing in the file. */
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#ifdef __GNUC__
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#define alloca __builtin_alloca
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#else /* not __GNUC__ */
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#if HAVE_ALLOCA_H
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#include <alloca.h>
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#else /* not HAVE_ALLOCA_H */
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#ifdef _AIX
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#pragma alloca
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#else /* not _AIX */
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char *alloca ();
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#endif /* not _AIX */
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#endif /* not HAVE_ALLOCA_H */
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#endif /* not __GNUC__ */
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#endif /* YYBISON */
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/* Bletch, ^^^^ that was ugly! */
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#include "flexdef.h"
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int pat, scnum, eps, headcnt, trailcnt, anyccl, lastchar, i, actvp, rulelen;
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int trlcontxt, xcluflg, cclsorted, varlength, variable_trail_rule;
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int *active_ss;
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Char clower();
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void build_eof_action();
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void yyerror();
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static int madeany = false; /* whether we've made the '.' character class */
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int previous_continued_action; /* whether the previous rule's action was '|' */
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/* On some over-ambitious machines, such as DEC Alpha's, the default
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* token type is "long" instead of "int"; this leads to problems with
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* declaring yylval in flexdef.h. But so far, all the yacc's I've seen
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* wrap their definitions of YYSTYPE with "#ifndef YYSTYPE"'s, so the
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* following should ensure that the default token type is "int".
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*/
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#define YYSTYPE int
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%}
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%%
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goal : initlex sect1 sect1end sect2 initforrule
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{ /* add default rule */
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int def_rule;
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pat = cclinit();
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cclnegate( pat );
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def_rule = mkstate( -pat );
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/* Remember the number of the default rule so we
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* don't generate "can't match" warnings for it.
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*/
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default_rule = num_rules;
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finish_rule( def_rule, false, 0, 0 );
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for ( i = 1; i <= lastsc; ++i )
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scset[i] = mkbranch( scset[i], def_rule );
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if ( spprdflt )
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add_action(
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"YY_FATAL_ERROR( \"flex scanner jammed\" )" );
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else
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add_action( "ECHO" );
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add_action( ";\n\tYY_BREAK\n" );
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}
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;
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initlex :
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{ /* initialize for processing rules */
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/* Create default DFA start condition. */
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scinstal( "INITIAL", false );
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/* Initially, the start condition scoping is
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* "no start conditions active".
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*/
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actvp = 0;
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}
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;
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sect1 : sect1 startconddecl WHITESPACE namelist1 '\n'
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| error '\n'
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{ synerr( "unknown error processing section 1" ); }
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;
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sect1end : SECTEND
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{
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/* We now know how many start conditions there
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* are, so create the "activity" map indicating
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* which conditions are active.
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*/
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active_ss = allocate_integer_array( lastsc + 1 );
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for ( i = 1; i <= lastsc; ++i )
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active_ss[i] = 0;
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}
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;
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startconddecl : SCDECL
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{ xcluflg = false; }
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| XSCDECL
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{ xcluflg = true; }
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;
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namelist1 : namelist1 WHITESPACE NAME
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{ scinstal( nmstr, xcluflg ); }
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| NAME
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{ scinstal( nmstr, xcluflg ); }
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| error
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{ synerr( "bad start condition list" ); }
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;
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sect2 : sect2 initforrule flexrule '\n'
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;
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initforrule :
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{
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/* Initialize for a parse of one rule. */
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trlcontxt = variable_trail_rule = varlength = false;
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trailcnt = headcnt = rulelen = 0;
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current_state_type = STATE_NORMAL;
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previous_continued_action = continued_action;
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new_rule();
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}
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;
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flexrule : scon '^' rule
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{
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pat = $3;
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finish_rule( pat, variable_trail_rule,
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headcnt, trailcnt );
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for ( i = 1; i <= actvp; ++i )
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scbol[actvsc[i]] =
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mkbranch( scbol[actvsc[i]], pat );
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if ( ! bol_needed )
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{
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bol_needed = true;
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if ( performance_report > 1 )
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pinpoint_message(
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"'^' operator results in sub-optimal performance" );
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}
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}
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| scon rule
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{
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pat = $2;
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finish_rule( pat, variable_trail_rule,
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headcnt, trailcnt );
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for ( i = 1; i <= actvp; ++i )
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scset[actvsc[i]] =
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mkbranch( scset[actvsc[i]], pat );
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}
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| '^' rule
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{
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pat = $2;
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finish_rule( pat, variable_trail_rule,
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headcnt, trailcnt );
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/* Add to all non-exclusive start conditions,
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* including the default (0) start condition.
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*/
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for ( i = 1; i <= lastsc; ++i )
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if ( ! scxclu[i] )
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scbol[i] = mkbranch( scbol[i], pat );
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if ( ! bol_needed )
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{
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bol_needed = true;
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if ( performance_report > 1 )
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pinpoint_message(
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"'^' operator results in sub-optimal performance" );
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}
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}
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| rule
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{
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pat = $1;
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finish_rule( pat, variable_trail_rule,
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headcnt, trailcnt );
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for ( i = 1; i <= lastsc; ++i )
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if ( ! scxclu[i] )
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scset[i] = mkbranch( scset[i], pat );
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}
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| scon EOF_OP
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{ build_eof_action(); }
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| EOF_OP
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{
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/* This EOF applies to all start conditions
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* which don't already have EOF actions.
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*/
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actvp = 0;
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for ( i = 1; i <= lastsc; ++i )
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if ( ! sceof[i] )
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actvsc[++actvp] = i;
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if ( actvp == 0 )
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warn(
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"all start conditions already have <<EOF>> rules" );
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else
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build_eof_action();
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}
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| error
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{ synerr( "unrecognized rule" ); }
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;
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scon : '<' namelist2 '>'
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| '<' '*' '>'
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{
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actvp = 0;
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for ( i = 1; i <= lastsc; ++i )
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actvsc[++actvp] = i;
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}
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;
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namelist2 : namelist2 ',' sconname
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| { actvp = 0; } sconname
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| error
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{ synerr( "bad start condition list" ); }
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;
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sconname : NAME
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{
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if ( (scnum = sclookup( nmstr )) == 0 )
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format_pinpoint_message(
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"undeclared start condition %s",
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nmstr );
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else
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{
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if ( ++actvp >= current_max_scs )
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/* Some bozo has included multiple
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* instances of start condition names.
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*/
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pinpoint_message(
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"too many start conditions in <> construct!" );
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else
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actvsc[actvp] = scnum;
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}
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}
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;
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rule : re2 re
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{
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if ( transchar[lastst[$2]] != SYM_EPSILON )
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/* Provide final transition \now/ so it
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* will be marked as a trailing context
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* state.
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*/
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$2 = link_machines( $2,
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mkstate( SYM_EPSILON ) );
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mark_beginning_as_normal( $2 );
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current_state_type = STATE_NORMAL;
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if ( previous_continued_action )
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{
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/* We need to treat this as variable trailing
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* context so that the backup does not happen
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* in the action but before the action switch
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* statement. If the backup happens in the
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* action, then the rules "falling into" this
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* one's action will *also* do the backup,
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* erroneously.
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*/
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if ( ! varlength || headcnt != 0 )
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warn(
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"trailing context made variable due to preceding '|' action" );
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/* Mark as variable. */
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varlength = true;
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headcnt = 0;
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}
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if ( lex_compat || (varlength && headcnt == 0) )
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{ /* variable trailing context rule */
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/* Mark the first part of the rule as the
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* accepting "head" part of a trailing
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* context rule.
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*
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* By the way, we didn't do this at the
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* beginning of this production because back
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* then current_state_type was set up for a
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* trail rule, and add_accept() can create
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* a new state ...
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*/
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add_accept( $1,
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num_rules | YY_TRAILING_HEAD_MASK );
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variable_trail_rule = true;
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}
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else
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trailcnt = rulelen;
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$$ = link_machines( $1, $2 );
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}
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| re2 re '$'
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{ synerr( "trailing context used twice" ); }
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| re '$'
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{
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headcnt = 0;
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trailcnt = 1;
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rulelen = 1;
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varlength = false;
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current_state_type = STATE_TRAILING_CONTEXT;
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if ( trlcontxt )
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{
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synerr( "trailing context used twice" );
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$$ = mkstate( SYM_EPSILON );
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}
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else if ( previous_continued_action )
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{
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/* See the comment in the rule for "re2 re"
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* above.
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*/
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warn(
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"trailing context made variable due to preceding '|' action" );
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varlength = true;
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}
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if ( lex_compat || varlength )
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{
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/* Again, see the comment in the rule for
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* "re2 re" above.
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*/
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add_accept( $1,
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num_rules | YY_TRAILING_HEAD_MASK );
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variable_trail_rule = true;
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}
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trlcontxt = true;
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eps = mkstate( SYM_EPSILON );
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$$ = link_machines( $1,
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link_machines( eps, mkstate( '\n' ) ) );
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}
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| re
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{
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$$ = $1;
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if ( trlcontxt )
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{
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if ( lex_compat || (varlength && headcnt == 0) )
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/* Both head and trail are
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* variable-length.
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*/
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variable_trail_rule = true;
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else
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trailcnt = rulelen;
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}
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}
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;
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re : re '|' series
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{
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varlength = true;
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$$ = mkor( $1, $3 );
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}
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| series
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{ $$ = $1; }
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;
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re2 : re '/'
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{
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/* This rule is written separately so the
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* reduction will occur before the trailing
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* series is parsed.
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*/
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if ( trlcontxt )
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synerr( "trailing context used twice" );
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else
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trlcontxt = true;
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if ( varlength )
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/* We hope the trailing context is
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* fixed-length.
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*/
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varlength = false;
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else
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headcnt = rulelen;
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rulelen = 0;
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current_state_type = STATE_TRAILING_CONTEXT;
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$$ = $1;
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}
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;
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series : series singleton
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{
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/* This is where concatenation of adjacent patterns
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* gets done.
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*/
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$$ = link_machines( $1, $2 );
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}
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| singleton
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{ $$ = $1; }
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;
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singleton : singleton '*'
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{
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varlength = true;
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$$ = mkclos( $1 );
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}
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| singleton '+'
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{
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varlength = true;
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$$ = mkposcl( $1 );
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}
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| singleton '?'
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{
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varlength = true;
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$$ = mkopt( $1 );
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}
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| singleton '{' NUMBER ',' NUMBER '}'
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{
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varlength = true;
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if ( $3 > $5 || $3 < 0 )
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{
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synerr( "bad iteration values" );
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$$ = $1;
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}
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else
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{
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if ( $3 == 0 )
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{
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if ( $5 <= 0 )
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{
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synerr(
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"bad iteration values" );
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$$ = $1;
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}
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else
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$$ = mkopt(
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mkrep( $1, 1, $5 ) );
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}
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else
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$$ = mkrep( $1, $3, $5 );
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}
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}
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| singleton '{' NUMBER ',' '}'
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{
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varlength = true;
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if ( $3 <= 0 )
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{
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synerr( "iteration value must be positive" );
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$$ = $1;
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}
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else
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$$ = mkrep( $1, $3, INFINITY );
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}
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| singleton '{' NUMBER '}'
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{
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/* The singleton could be something like "(foo)",
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* in which case we have no idea what its length
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* is, so we punt here.
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*/
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varlength = true;
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if ( $3 <= 0 )
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{
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synerr( "iteration value must be positive" );
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$$ = $1;
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}
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else
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$$ = link_machines( $1,
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copysingl( $1, $3 - 1 ) );
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}
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| '.'
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{
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if ( ! madeany )
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{
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/* Create the '.' character class. */
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anyccl = cclinit();
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ccladd( anyccl, '\n' );
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cclnegate( anyccl );
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if ( useecs )
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mkeccl( ccltbl + cclmap[anyccl],
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ccllen[anyccl], nextecm,
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ecgroup, csize, csize );
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madeany = true;
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}
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++rulelen;
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$$ = mkstate( -anyccl );
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}
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| fullccl
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{
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if ( ! cclsorted )
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/* Sort characters for fast searching. We
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* use a shell sort since this list could
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* be large.
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*/
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cshell( ccltbl + cclmap[$1], ccllen[$1], true );
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if ( useecs )
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mkeccl( ccltbl + cclmap[$1], ccllen[$1],
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nextecm, ecgroup, csize, csize );
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++rulelen;
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$$ = mkstate( -$1 );
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}
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| PREVCCL
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{
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++rulelen;
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$$ = mkstate( -$1 );
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}
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|
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| '"' string '"'
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{ $$ = $2; }
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| '(' re ')'
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{ $$ = $2; }
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|
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| CHAR
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{
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++rulelen;
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|
if ( caseins && $1 >= 'A' && $1 <= 'Z' )
|
|
$1 = clower( $1 );
|
|
|
|
$$ = mkstate( $1 );
|
|
}
|
|
;
|
|
|
|
fullccl : '[' ccl ']'
|
|
{ $$ = $2; }
|
|
|
|
| '[' '^' ccl ']'
|
|
{
|
|
cclnegate( $3 );
|
|
$$ = $3;
|
|
}
|
|
;
|
|
|
|
ccl : ccl CHAR '-' CHAR
|
|
{
|
|
if ( caseins )
|
|
{
|
|
if ( $2 >= 'A' && $2 <= 'Z' )
|
|
$2 = clower( $2 );
|
|
if ( $4 >= 'A' && $4 <= 'Z' )
|
|
$4 = clower( $4 );
|
|
}
|
|
|
|
if ( $2 > $4 )
|
|
synerr( "negative range in character class" );
|
|
|
|
else
|
|
{
|
|
for ( i = $2; i <= $4; ++i )
|
|
ccladd( $1, i );
|
|
|
|
/* Keep track if this ccl is staying in
|
|
* alphabetical order.
|
|
*/
|
|
cclsorted = cclsorted && ($2 > lastchar);
|
|
lastchar = $4;
|
|
}
|
|
|
|
$$ = $1;
|
|
}
|
|
|
|
| ccl CHAR
|
|
{
|
|
if ( caseins && $2 >= 'A' && $2 <= 'Z' )
|
|
$2 = clower( $2 );
|
|
|
|
ccladd( $1, $2 );
|
|
cclsorted = cclsorted && ($2 > lastchar);
|
|
lastchar = $2;
|
|
$$ = $1;
|
|
}
|
|
|
|
|
|
|
{
|
|
cclsorted = true;
|
|
lastchar = 0;
|
|
$$ = cclinit();
|
|
}
|
|
;
|
|
|
|
string : string CHAR
|
|
{
|
|
if ( caseins && $2 >= 'A' && $2 <= 'Z' )
|
|
$2 = clower( $2 );
|
|
|
|
++rulelen;
|
|
|
|
$$ = link_machines( $1, mkstate( $2 ) );
|
|
}
|
|
|
|
|
|
|
{ $$ = mkstate( SYM_EPSILON ); }
|
|
;
|
|
|
|
%%
|
|
|
|
|
|
/* build_eof_action - build the "<<EOF>>" action for the active start
|
|
* conditions
|
|
*/
|
|
|
|
void build_eof_action()
|
|
{
|
|
register int i;
|
|
char action_text[MAXLINE];
|
|
|
|
for ( i = 1; i <= actvp; ++i )
|
|
{
|
|
if ( sceof[actvsc[i]] )
|
|
format_pinpoint_message(
|
|
"multiple <<EOF>> rules for start condition %s",
|
|
scname[actvsc[i]] );
|
|
|
|
else
|
|
{
|
|
sceof[actvsc[i]] = true;
|
|
sprintf( action_text, "case YY_STATE_EOF(%s):\n",
|
|
scname[actvsc[i]] );
|
|
add_action( action_text );
|
|
}
|
|
}
|
|
|
|
line_directive_out( (FILE *) 0 );
|
|
|
|
/* This isn't a normal rule after all - don't count it as
|
|
* such, so we don't have any holes in the rule numbering
|
|
* (which make generating "rule can never match" warnings
|
|
* more difficult.
|
|
*/
|
|
--num_rules;
|
|
++num_eof_rules;
|
|
}
|
|
|
|
|
|
/* format_synerr - write out formatted syntax error */
|
|
|
|
void format_synerr( msg, arg )
|
|
char msg[], arg[];
|
|
{
|
|
char errmsg[MAXLINE];
|
|
|
|
(void) sprintf( errmsg, msg, arg );
|
|
synerr( errmsg );
|
|
}
|
|
|
|
|
|
/* synerr - report a syntax error */
|
|
|
|
void synerr( str )
|
|
char str[];
|
|
{
|
|
syntaxerror = true;
|
|
pinpoint_message( str );
|
|
}
|
|
|
|
|
|
/* warn - report a warning, unless -w was given */
|
|
|
|
void warn( str )
|
|
char str[];
|
|
{
|
|
line_warning( str, linenum );
|
|
}
|
|
|
|
/* format_pinpoint_message - write out a message formatted with one string,
|
|
* pinpointing its location
|
|
*/
|
|
|
|
void format_pinpoint_message( msg, arg )
|
|
char msg[], arg[];
|
|
{
|
|
char errmsg[MAXLINE];
|
|
|
|
(void) sprintf( errmsg, msg, arg );
|
|
pinpoint_message( errmsg );
|
|
}
|
|
|
|
|
|
/* pinpoint_message - write out a message, pinpointing its location */
|
|
|
|
void pinpoint_message( str )
|
|
char str[];
|
|
{
|
|
line_pinpoint( str, linenum );
|
|
}
|
|
|
|
|
|
/* line_warning - report a warning at a given line, unless -w was given */
|
|
|
|
void line_warning( str, line )
|
|
char str[];
|
|
int line;
|
|
{
|
|
char warning[MAXLINE];
|
|
|
|
if ( ! nowarn )
|
|
{
|
|
sprintf( warning, "warning, %s", str );
|
|
line_pinpoint( warning, line );
|
|
}
|
|
}
|
|
|
|
|
|
/* line_pinpoint - write out a message, pinpointing it at the given line */
|
|
|
|
void line_pinpoint( str, line )
|
|
char str[];
|
|
int line;
|
|
{
|
|
fprintf( stderr, "\"%s\", line %d: %s\n", infilename, line, str );
|
|
}
|
|
|
|
|
|
/* yyerror - eat up an error message from the parser;
|
|
* currently, messages are ignore
|
|
*/
|
|
|
|
void yyerror( msg )
|
|
char msg[];
|
|
{
|
|
}
|