703 lines
14 KiB
Plaintext
703 lines
14 KiB
Plaintext
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/* 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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#ifndef lint
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static char rcsid[] =
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"@(#) $Header$ (LBL)";
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#endif
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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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Char clower();
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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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%}
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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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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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fputs( "YY_FATAL_ERROR( \"flex scanner jammed\" )",
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temp_action_file );
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else
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fputs( "ECHO", temp_action_file );
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fputs( ";\n\tYY_BREAK\n", temp_action_file );
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}
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;
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initlex :
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{
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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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}
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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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startconddecl : SCDECL
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{
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/* these productions are separate from the s1object
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* rule because the semantics must be done before
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* we parse the remainder of an s1object
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*/
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xcluflg = false;
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}
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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 )
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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 )
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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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pinpoint_message(
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"warning - 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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namelist2 : namelist2 ',' 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", nmstr );
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else
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actvsc[++actvp] = scnum;
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}
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| 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", nmstr );
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else
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actvsc[actvp = 1] = scnum;
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}
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| error
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{ synerr( "bad start condition list" ); }
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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, 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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{
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fprintf( stderr,
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"%s: warning - trailing context rule at line %d made variable because\n",
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program_name, linenum );
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fprintf( stderr,
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" of preceding '|' action\n" );
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}
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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 ( varlength && headcnt == 0 )
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{ /* variable trailing context rule */
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/* mark the first part of the rule as the accepting
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* "head" part of a trailing context rule
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*/
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/* by the way, we didn't do this at the beginning
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* of this production because back then
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* current_state_type was set up for a trail
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* rule, and add_accept() can create a new
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* state ...
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*/
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add_accept( $1, 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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$$ = link_machines( $1, $2 );
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}
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| re2 re '$'
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{ synerr( "trailing context used twice" ); }
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| re '$'
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{
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if ( trlcontxt )
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{
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synerr( "trailing context used twice" );
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$$ = 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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if ( ! varlength || headcnt != 0 )
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{
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fprintf( stderr,
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"%s: warning - trailing context rule at line %d made variable because\n",
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program_name, linenum );
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fprintf( stderr,
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" of preceding '|' action\n" );
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}
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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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trlcontxt = true;
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if ( ! varlength )
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headcnt = rulelen;
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++rulelen;
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trailcnt = 1;
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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 ( varlength && headcnt == 0 )
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/* both head and trail are variable-length */
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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
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* the 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 fixed-length */
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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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$$ = $1;
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}
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else
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{
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if ( $3 == 0 )
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$$ = mkopt( mkrep( $1, $3, $5 ) );
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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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$$ = link_machines( $1, copysingl( $1, $3 - 1 ) );
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}
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| '.'
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{
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if ( ! madeany )
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{
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/* create the '.' character class */
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anyccl = cclinit();
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ccladd( anyccl, '\n' );
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cclnegate( anyccl );
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if ( useecs )
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mkeccl( ccltbl + cclmap[anyccl],
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ccllen[anyccl], nextecm,
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ecgroup, csize, csize );
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madeany = true;
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}
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++rulelen;
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$$ = 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 use a
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* shell sort since this list could 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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| '"' string '"'
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{ $$ = $2; }
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| '(' re ')'
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{ $$ = $2; }
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| CHAR
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{
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++rulelen;
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if ( caseins && $1 >= 'A' && $1 <= 'Z' )
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$1 = clower( $1 );
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$$ = mkstate( $1 );
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}
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;
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fullccl : '[' ccl ']'
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{ $$ = $2; }
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| '[' '^' ccl ']'
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{
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/* *Sigh* - to be compatible Unix lex, negated ccls
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* match newlines
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*/
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#ifdef NOTDEF
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ccladd( $3, '\n' ); /* negated ccls don't match '\n' */
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cclsorted = false; /* because we added the newline */
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#endif
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cclnegate( $3 );
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$$ = $3;
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}
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;
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ccl : ccl CHAR '-' CHAR
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{
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if ( $2 > $4 )
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synerr( "negative range in character class" );
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else
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{
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if ( caseins )
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{
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if ( $2 >= 'A' && $2 <= 'Z' )
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$2 = clower( $2 );
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if ( $4 >= 'A' && $4 <= 'Z' )
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$4 = clower( $4 );
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}
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for ( i = $2; i <= $4; ++i )
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ccladd( $1, i );
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/* keep track if this ccl is staying in alphabetical
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* order
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*/
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cclsorted = cclsorted && ($2 > lastchar);
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lastchar = $4;
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}
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$$ = $1;
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}
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| ccl CHAR
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{
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if ( caseins )
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if ( $2 >= 'A' && $2 <= 'Z' )
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$2 = clower( $2 );
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ccladd( $1, $2 );
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cclsorted = cclsorted && ($2 > lastchar);
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lastchar = $2;
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$$ = $1;
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}
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{
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cclsorted = true;
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lastchar = 0;
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$$ = cclinit();
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}
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;
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string : string CHAR
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{
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if ( caseins )
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if ( $2 >= 'A' && $2 <= 'Z' )
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$2 = clower( $2 );
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++rulelen;
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$$ = link_machines( $1, mkstate( $2 ) );
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}
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{ $$ = mkstate( SYM_EPSILON ); }
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;
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%%
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/* build_eof_action - build the "<<EOF>>" action for the active start
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* conditions
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*/
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void build_eof_action()
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{
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register int i;
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for ( i = 1; i <= actvp; ++i )
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{
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if ( sceof[actvsc[i]] )
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format_pinpoint_message(
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"multiple <<EOF>> rules for start condition %s",
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scname[actvsc[i]] );
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else
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{
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sceof[actvsc[i]] = true;
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fprintf( temp_action_file, "case YY_STATE_EOF(%s):\n",
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scname[actvsc[i]] );
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}
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}
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line_directive_out( temp_action_file );
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}
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/* synerr - report a syntax error */
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void synerr( str )
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char str[];
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{
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syntaxerror = true;
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pinpoint_message( str );
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}
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/* format_pinpoint_message - write out a message formatted with one string,
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* pinpointing its location
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*/
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void format_pinpoint_message( msg, arg )
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char msg[], arg[];
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{
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char errmsg[MAXLINE];
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(void) sprintf( errmsg, msg, arg );
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pinpoint_message( errmsg );
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}
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/* pinpoint_message - write out a message, pinpointing its location */
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void pinpoint_message( str )
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char str[];
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{
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fprintf( stderr, "\"%s\", line %d: %s\n", infilename, linenum, str );
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}
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/* yyerror - eat up an error message from the parser;
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* currently, messages are ignore
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*/
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void yyerror( msg )
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char msg[];
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{
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}
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