914 lines
17 KiB
Plaintext
914 lines
17 KiB
Plaintext
/* parse.y - parser for flex input */
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%token CHAR NUMBER SECTEND SCDECL XSCDECL NAME PREVCCL EOF_OP
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%token OPTION_OP OPT_OUTFILE OPT_PREFIX OPT_YYCLASS
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%token CCE_ALNUM CCE_ALPHA CCE_BLANK CCE_CNTRL CCE_DIGIT CCE_GRAPH
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%token CCE_LOWER CCE_PRINT CCE_PUNCT CCE_SPACE CCE_UPPER CCE_XDIGIT
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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 2.28 95/04/21 11:51:51 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. What a piece. */
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# ifdef _AIX
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#pragma alloca
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# endif
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#endif
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#include "flexdef.h"
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/* The remainder of the alloca() cruft has to come after including flexdef.h,
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* so HAVE_ALLOCA_H is (possibly) defined.
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*/
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#ifdef YYBISON
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# ifdef __GNUC__
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# ifndef alloca
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# define alloca __builtin_alloca
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# endif
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# else
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# if HAVE_ALLOCA_H
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# include <alloca.h>
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# else
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# ifdef __hpux
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void *alloca ();
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# else
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# ifdef __TURBOC__
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# include <malloc.h>
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# else
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char *alloca ();
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# endif
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# endif
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# endif
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# endif
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#endif
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/* Bletch, ^^^^ that was ugly! */
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int pat, scnum, eps, headcnt, trailcnt, anyccl, lastchar, i, rulelen;
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int trlcontxt, xcluflg, currccl, cclsorted, varlength, variable_trail_rule;
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int *scon_stk;
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int scon_stk_ptr;
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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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/* Expand a POSIX character class expression. */
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#define CCL_EXPR(func) \
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{ \
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int c; \
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for ( c = 0; c < csize; ++c ) \
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if ( isascii(c) && func(c) ) \
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ccladd( currccl, c ); \
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}
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/* While POSIX defines isblank(), it's not ANSI C. */
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#define IS_BLANK(c) ((c) == ' ' || (c) == '\t')
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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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}
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;
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sect1 : sect1 startconddecl namelist1
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| sect1 options
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| error
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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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check_options();
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scon_stk = allocate_integer_array( lastsc + 1 );
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scon_stk_ptr = 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 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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options : OPTION_OP optionlist
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;
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optionlist : optionlist option
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;
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option : OPT_OUTFILE '=' NAME
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{
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outfilename = copy_string( nmstr );
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did_outfilename = 1;
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}
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| OPT_PREFIX '=' NAME
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{ prefix = copy_string( nmstr ); }
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| OPT_YYCLASS '=' NAME
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{ yyclass = copy_string( nmstr ); }
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;
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sect2 : sect2 scon initforrule flexrule '\n'
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{ scon_stk_ptr = $2; }
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| sect2 scon '{' sect2 '}'
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{ scon_stk_ptr = $2; }
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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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in_rule = true;
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new_rule();
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}
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;
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flexrule : '^' 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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if ( scon_stk_ptr > 0 )
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{
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for ( i = 1; i <= scon_stk_ptr; ++i )
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scbol[scon_stk[i]] =
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mkbranch( scbol[scon_stk[i]],
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pat );
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}
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else
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{
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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],
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pat );
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}
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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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if ( scon_stk_ptr > 0 )
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{
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for ( i = 1; i <= scon_stk_ptr; ++i )
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scset[scon_stk[i]] =
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mkbranch( scset[scon_stk[i]],
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pat );
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}
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else
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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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scset[i] =
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mkbranch( scset[i],
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pat );
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}
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}
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| EOF_OP
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{
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if ( scon_stk_ptr > 0 )
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build_eof_action();
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else
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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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for ( i = 1; i <= lastsc; ++i )
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if ( ! sceof[i] )
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scon_stk[++scon_stk_ptr] = i;
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if ( scon_stk_ptr == 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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}
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| error
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{ synerr( "unrecognized rule" ); }
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;
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scon_stk_ptr :
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{ $$ = scon_stk_ptr; }
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;
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scon : '<' scon_stk_ptr namelist2 '>'
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{ $$ = $2; }
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| '<' '*' '>'
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{
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$$ = scon_stk_ptr;
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for ( i = 1; i <= lastsc; ++i )
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{
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int j;
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for ( j = 1; j <= scon_stk_ptr; ++j )
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if ( scon_stk[j] == i )
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break;
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if ( j > scon_stk_ptr )
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scon_stk[++scon_stk_ptr] = i;
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}
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}
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{ $$ = scon_stk_ptr; }
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;
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namelist2 : namelist2 ',' sconname
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| 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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for ( i = 1; i <= scon_stk_ptr; ++i )
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if ( scon_stk[i] == scnum )
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{
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format_warn(
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"<%s> specified twice",
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scname[scnum] );
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break;
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}
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if ( i > scon_stk_ptr )
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scon_stk[++scon_stk_ptr] = 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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$$ = mkor( $1, $3 );
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}
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|
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| series
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{ $$ = $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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|
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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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$$ = $1;
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}
|
|
|
|
else
|
|
$$ = link_machines( $1,
|
|
copysingl( $1, $3 - 1 ) );
|
|
}
|
|
|
|
| '.'
|
|
{
|
|
if ( ! madeany )
|
|
{
|
|
/* Create the '.' character class. */
|
|
anyccl = cclinit();
|
|
ccladd( anyccl, '\n' );
|
|
cclnegate( anyccl );
|
|
|
|
if ( useecs )
|
|
mkeccl( ccltbl + cclmap[anyccl],
|
|
ccllen[anyccl], nextecm,
|
|
ecgroup, csize, csize );
|
|
|
|
madeany = true;
|
|
}
|
|
|
|
++rulelen;
|
|
|
|
$$ = mkstate( -anyccl );
|
|
}
|
|
|
|
| fullccl
|
|
{
|
|
if ( ! cclsorted )
|
|
/* Sort characters for fast searching. We
|
|
* use a shell sort since this list could
|
|
* be large.
|
|
*/
|
|
cshell( ccltbl + cclmap[$1], ccllen[$1], true );
|
|
|
|
if ( useecs )
|
|
mkeccl( ccltbl + cclmap[$1], ccllen[$1],
|
|
nextecm, ecgroup, csize, csize );
|
|
|
|
++rulelen;
|
|
|
|
$$ = mkstate( -$1 );
|
|
}
|
|
|
|
| PREVCCL
|
|
{
|
|
++rulelen;
|
|
|
|
$$ = mkstate( -$1 );
|
|
}
|
|
|
|
| '"' string '"'
|
|
{ $$ = $2; }
|
|
|
|
| '(' re ')'
|
|
{ $$ = $2; }
|
|
|
|
| CHAR
|
|
{
|
|
++rulelen;
|
|
|
|
if ( caseins && $1 >= 'A' && $1 <= 'Z' )
|
|
$1 = clower( $1 );
|
|
|
|
$$ = 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;
|
|
}
|
|
|
|
| ccl ccl_expr
|
|
{
|
|
/* Too hard to properly maintain cclsorted. */
|
|
cclsorted = false;
|
|
$$ = $1;
|
|
}
|
|
|
|
|
|
|
{
|
|
cclsorted = true;
|
|
lastchar = 0;
|
|
currccl = $$ = cclinit();
|
|
}
|
|
;
|
|
|
|
ccl_expr: CCE_ALNUM { CCL_EXPR(isalnum) }
|
|
| CCE_ALPHA { CCL_EXPR(isalpha) }
|
|
| CCE_BLANK { CCL_EXPR(IS_BLANK) }
|
|
| CCE_CNTRL { CCL_EXPR(iscntrl) }
|
|
| CCE_DIGIT { CCL_EXPR(isdigit) }
|
|
| CCE_GRAPH { CCL_EXPR(isgraph) }
|
|
| CCE_LOWER { CCL_EXPR(islower) }
|
|
| CCE_PRINT { CCL_EXPR(isprint) }
|
|
| CCE_PUNCT { CCL_EXPR(ispunct) }
|
|
| CCE_SPACE { CCL_EXPR(isspace) }
|
|
| CCE_UPPER {
|
|
if ( caseins )
|
|
CCL_EXPR(islower)
|
|
else
|
|
CCL_EXPR(isupper)
|
|
}
|
|
| CCE_XDIGIT { CCL_EXPR(isxdigit) }
|
|
;
|
|
|
|
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 <= scon_stk_ptr; ++i )
|
|
{
|
|
if ( sceof[scon_stk[i]] )
|
|
format_pinpoint_message(
|
|
"multiple <<EOF>> rules for start condition %s",
|
|
scname[scon_stk[i]] );
|
|
|
|
else
|
|
{
|
|
sceof[scon_stk[i]] = true;
|
|
sprintf( action_text, "case YY_STATE_EOF(%s):\n",
|
|
scname[scon_stk[i]] );
|
|
add_action( action_text );
|
|
}
|
|
}
|
|
|
|
line_directive_out( (FILE *) 0, 1 );
|
|
|
|
/* 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 );
|
|
}
|
|
|
|
|
|
/* format_warn - write out formatted warning */
|
|
|
|
void format_warn( msg, arg )
|
|
char msg[], arg[];
|
|
{
|
|
char warn_msg[MAXLINE];
|
|
|
|
(void) sprintf( warn_msg, msg, arg );
|
|
warn( warn_msg );
|
|
}
|
|
|
|
|
|
/* 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[];
|
|
{
|
|
}
|