Aminet 1/Aminet - June 1993 [Walnut Creek].iso/usenet/sources/volume90/unix/flex_2_3/part07

Internet Message Format | 1990-08-19 | 34.2 KB

Path: abcfd20.larc.nasa.gov!amiga-request
From: [e-mail] (Amiga Sources/Binaries Moderator)
Subject: v90i234: flex 2.3 - fast lexical analyzer generator, Part07/13
Reply-To: [e-mail] (William P Loftus)
Newsgroups: comp.sources.amiga
Message-ID: <comp.sources.amiga:[e-mail]>
Date: 19 Aug 90 22:42:50 GMT
Approved: [e-mail] (Tad Guy)
X-Mail-Submissions-To: [e-mail]
X-Post-Discussions-To: comp.sys.amiga

Submitted-by: [e-mail] (William P Loftus)
Posting-number: Volume 90, Issue 234
Archive-name: unix/flex-2.3/part07

#!/bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#        "End of archive 7 (of 13)."
# Contents:  gen.c
# Wrapped by tadguy@abcfd20 on Sun Aug 19 18:41:46 1990
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'gen.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'gen.c'\"
else
echo shar: Extracting \"'gen.c'\" \(31559 characters\)
sed "s/^X//" >'gen.c' <<'END_OF_FILE'
X/* gen - actual generation (writing) of flex scanners */
X
X/*-
X * Copyright (c) 1990 The Regents of the University of California.
X * All rights reserved.
X *
X * This code is derived from software contributed to Berkeley by
X * Vern Paxson.
X *
X * The United States Government has rights in this work pursuant
X * to contract no. DE-AC03-76SF00098 between the United States
X * Department of Energy and the University of California.
X *
X * Redistribution and use in source and binary forms are permitted provided
X * that: (1) source distributions retain this entire copyright notice and
X * comment, and (2) distributions including binaries display the following
X * acknowledgement:  ``This product includes software developed by the
X * University of California, Berkeley and its contributors'' in the
X * documentation or other materials provided with the distribution and in
X * all advertising materials mentioning features or use of this software.
X * Neither the name of the University nor the names of its contributors may
X * be used to endorse or promote products derived from this software without
X * specific prior written permission.
X * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
X * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
X * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
X */
X
X#ifndef lint
Xstatic char rcsid[] =
X    "@(#) $Header: /usr/fsys/odin/a/vern/flex/RCS/gen.c,v 2.9 90/06/27 23:48:22 vern Exp $ (LBL)";
X#endif
X
X#include "flexdef.h"
X
X
X/* declare functions that have forward references */
X
Xvoid gen_next_state PROTO((int));
Xvoid genecs PROTO(());
Xvoid indent_put2s PROTO((char [], char []));
Xvoid indent_puts PROTO((char []));
X
X
Xstatic int indent_level = 0; /* each level is 4 spaces */
X
X#define indent_up() (++indent_level)
X#define indent_down() (--indent_level)
X#define set_indent(indent_val) indent_level = indent_val
X
X/* *everything* is done in terms of arrays starting at 1, so provide
X * a null entry for the zero element of all C arrays
X */
Xstatic char C_short_decl[] = "static const short int %s[%d] =\n    {   0,\n";
Xstatic char C_long_decl[] = "static const long int %s[%d] =\n    {   0,\n";
Xstatic char C_state_decl[] =
X    "static const yy_state_type %s[%d] =\n    {   0,\n";
X
X
X/* indent to the current level */
X
Xvoid do_indent()
X
X    {
X    register int i = indent_level * 4;
X
X    while ( i >= 8 )
X    {
X    putchar( '\t' );
X    i -= 8;
X    }
X
X    while ( i > 0 )
X    {
X    putchar( ' ' );
X    --i;
X    }
X    }
X
X
X/* generate the code to keep backtracking information */
X
Xvoid gen_backtracking()
X
X    {
X    if ( reject || num_backtracking == 0 )
X    return;
X
X    if ( fullspd )
X    indent_puts( "if ( yy_current_state[-1].yy_nxt )" );
X    else
X    indent_puts( "if ( yy_accept[yy_current_state] )" );
X
X    indent_up();
X    indent_puts( "{" );
X    indent_puts( "yy_last_accepting_state = yy_current_state;" );
X    indent_puts( "yy_last_accepting_cpos = yy_cp;" );
X    indent_puts( "}" );
X    indent_down();
X    }
X
X
X/* generate the code to perform the backtrack */
X
Xvoid gen_bt_action()
X
X    {
X    if ( reject || num_backtracking == 0 )
X    return;
X
X    set_indent( 3 );
X
X    indent_puts( "case 0: /* must backtrack */" );
X    indent_puts( "/* undo the effects of YY_DO_BEFORE_ACTION */" );
X    indent_puts( "*yy_cp = yy_hold_char;" );
X
X    if ( fullspd || fulltbl )
X    indent_puts( "yy_cp = yy_last_accepting_cpos + 1;" );
X    else
X    /* backtracking info for compressed tables is taken \after/
X     * yy_cp has been incremented for the next state
X     */
X    indent_puts( "yy_cp = yy_last_accepting_cpos;" );
X
X    indent_puts( "yy_current_state = yy_last_accepting_state;" );
X    indent_puts( "goto yy_find_action;" );
X    putchar( '\n' );
X
X    set_indent( 0 );
X    }
X
X
X/* genctbl - generates full speed compressed transition table
X *
X * synopsis
X *     genctbl();
X */
X
Xvoid genctbl()
X
X    {
X    register int i;
X    int end_of_buffer_action = num_rules + 1;
X
X    /* table of verify for transition and offset to next state */
X    printf( "static const struct yy_trans_info yy_transition[%d] =\n",
X        tblend + numecs + 1 );
X    printf( "    {\n" );
X
X    /* We want the transition to be represented as the offset to the
X     * next state, not the actual state number, which is what it currently is.
X     * The offset is base[nxt[i]] - base[chk[i]].  That's just the
X     * difference between the starting points of the two involved states
X     * (to - from).
X     *
X     * first, though, we need to find some way to put in our end-of-buffer
X     * flags and states.  We do this by making a state with absolutely no
X     * transitions.  We put it at the end of the table.
X     */
X    /* at this point, we're guaranteed that there's enough room in nxt[]
X     * and chk[] to hold tblend + numecs entries.  We need just two slots.
X     * One for the action and one for the end-of-buffer transition.  We
X     * now *assume* that we're guaranteed the only character we'll try to
X     * index this nxt/chk pair with is EOB, i.e., 0, so we don't have to
X     * make sure there's room for jam entries for other characters.
X     */
X
X    base[lastdfa + 1] = tblend + 2;
X    nxt[tblend + 1] = end_of_buffer_action;
X    chk[tblend + 1] = numecs + 1;
X    chk[tblend + 2] = 1; /* anything but EOB */
X    nxt[tblend + 2] = 0; /* so that "make test" won't show arb. differences */
X
X    /* make sure every state has a end-of-buffer transition and an action # */
X    for ( i = 0; i <= lastdfa; ++i )
X    {
X    register int anum = dfaacc[i].dfaacc_state;
X
X    chk[base[i]] = EOB_POSITION;
X    chk[base[i] - 1] = ACTION_POSITION;
X    nxt[base[i] - 1] = anum;    /* action number */
X    }
X
X    for ( i = 0; i <= tblend; ++i )
X    {
X    if ( chk[i] == EOB_POSITION )
X        transition_struct_out( 0, base[lastdfa + 1] - i );
X
X    else if ( chk[i] == ACTION_POSITION )
X        transition_struct_out( 0, nxt[i] );
X
X    else if ( chk[i] > numecs || chk[i] == 0 )
X        transition_struct_out( 0, 0 );        /* unused slot */
X
X    else    /* verify, transition */
X        transition_struct_out( chk[i], base[nxt[i]] - (i - chk[i]) );
X    }
X
X
X    /* here's the final, end-of-buffer state */
X    transition_struct_out( chk[tblend + 1], nxt[tblend + 1] );
X    transition_struct_out( chk[tblend + 2], nxt[tblend + 2] );
X
X    printf( "    };\n" );
X    printf( "\n" );
X
X    /* table of pointers to start states */
X    printf( "static const struct yy_trans_info *yy_start_state_list[%d] =\n",
X        lastsc * 2 + 1 );
X    printf( "    {\n" );
X
X    for ( i = 0; i <= lastsc * 2; ++i )
X    printf( "    &yy_transition[%d],\n", base[i] );
X
X    dataend();
X
X    if ( useecs )
X    genecs();
X    }
X
X
X/* generate equivalence-class tables */
X
Xvoid genecs()
X
X    {
X    register int i, j;
X    static char C_char_decl[] = "static const %s %s[%d] =\n    {   0,\n";
X    int numrows;
X    Char clower();
X
X    if ( numecs < csize )
X    printf( C_char_decl, "YY_CHAR", "yy_ec", csize );
X    else
X    printf( C_char_decl, "short", "yy_ec", csize );
X
X    for ( i = 1; i < csize; ++i )
X    {
X    if ( caseins && (i >= 'A') && (i <= 'Z') )
X        ecgroup[i] = ecgroup[clower( i )];
X
X    ecgroup[i] = abs( ecgroup[i] );
X    mkdata( ecgroup[i] );
X    }
X
X    dataend();
X
X    if ( trace )
X    {
X    char *readable_form();
X
X    fputs( "\n\nEquivalence Classes:\n\n", stderr );
X
X    numrows = csize / 8;
X
X    for ( j = 0; j < numrows; ++j )
X        {
X        for ( i = j; i < csize; i = i + numrows )
X        {
X        fprintf( stderr, "%4s = %-2d", readable_form( i ), ecgroup[i] );
X
X        putc( ' ', stderr );
X        }
X
X        putc( '\n', stderr );
X        }
X    }
X    }
X
X
X/* generate the code to find the action number */
X
Xvoid gen_find_action()
X
X    {
X    if ( fullspd )
X    indent_puts( "yy_act = yy_current_state[-1].yy_nxt;" );
X
X    else if ( fulltbl )
X    indent_puts( "yy_act = yy_accept[yy_current_state];" );
X
X    else if ( reject )
X    {
X    indent_puts( "yy_current_state = *--yy_state_ptr;" );
X    indent_puts( "yy_lp = yy_accept[yy_current_state];" );
X
X    puts( "find_rule: /* we branch to this label when backtracking */" );
X
X    indent_puts( "for ( ; ; ) /* until we find what rule we matched */" );
X
X    indent_up();
X
X    indent_puts( "{" );
X
X    indent_puts( "if ( yy_lp && yy_lp < yy_accept[yy_current_state + 1] )" );
X    indent_up();
X    indent_puts( "{" );
X    indent_puts( "yy_act = yy_acclist[yy_lp];" );
X
X    if ( variable_trailing_context_rules )
X        {
X        indent_puts( "if ( yy_act & YY_TRAILING_HEAD_MASK ||" );
X        indent_puts( "     yy_looking_for_trail_begin )" );
X        indent_up();
X        indent_puts( "{" );
X
X        indent_puts( "if ( yy_act == yy_looking_for_trail_begin )" );
X        indent_up();
X        indent_puts( "{" );
X        indent_puts( "yy_looking_for_trail_begin = 0;" );
X        indent_puts( "yy_act &= ~YY_TRAILING_HEAD_MASK;" );
X        indent_puts( "break;" );
X        indent_puts( "}" );
X        indent_down();
X
X        indent_puts( "}" );
X        indent_down();
X
X        indent_puts( "else if ( yy_act & YY_TRAILING_MASK )" );
X        indent_up();
X        indent_puts( "{" );
X        indent_puts(
X        "yy_looking_for_trail_begin = yy_act & ~YY_TRAILING_MASK;" );
X        indent_puts(
X        "yy_looking_for_trail_begin |= YY_TRAILING_HEAD_MASK;" );
X
X        if ( real_reject )
X        {
X        /* remember matched text in case we back up due to REJECT */
X        indent_puts( "yy_full_match = yy_cp;" );
X        indent_puts( "yy_full_state = yy_state_ptr;" );
X        indent_puts( "yy_full_lp = yy_lp;" );
X        }
X
X        indent_puts( "}" );
X        indent_down();
X
X        indent_puts( "else" );
X        indent_up();
X        indent_puts( "{" );
X        indent_puts( "yy_full_match = yy_cp;" );
X        indent_puts( "yy_full_state = yy_state_ptr;" );
X        indent_puts( "yy_full_lp = yy_lp;" );
X        indent_puts( "break;" );
X        indent_puts( "}" );
X        indent_down();
X
X        indent_puts( "++yy_lp;" );
X        indent_puts( "goto find_rule;" );
X        }
X
X    else
X        {
X        /* remember matched text in case we back up due to trailing context
X         * plus REJECT
X         */
X        indent_up();
X        indent_puts( "{" );
X        indent_puts( "yy_full_match = yy_cp;" );
X        indent_puts( "break;" );
X        indent_puts( "}" );
X        indent_down();
X        }
X
X    indent_puts( "}" );
X    indent_down();
X
X    indent_puts( "--yy_cp;" );
X
X    /* we could consolidate the following two lines with those at
X     * the beginning, but at the cost of complaints that we're
X     * branching inside a loop
X     */
X    indent_puts( "yy_current_state = *--yy_state_ptr;" );
X    indent_puts( "yy_lp = yy_accept[yy_current_state];" );
X
X    indent_puts( "}" );
X
X    indent_down();
X    }
X
X    else
X    /* compressed */
X    indent_puts( "yy_act = yy_accept[yy_current_state];" );
X    }
X
X
X/* genftbl - generates full transition table
X *
X * synopsis
X *     genftbl();
X */
X
Xvoid genftbl()
X
X    {
X    register int i;
X    int end_of_buffer_action = num_rules + 1;
X
X    printf( C_short_decl, "yy_accept", lastdfa + 1 );
X
X
X    dfaacc[end_of_buffer_state].dfaacc_state = end_of_buffer_action;
X
X    for ( i = 1; i <= lastdfa; ++i )
X    {
X    register int anum = dfaacc[i].dfaacc_state;
X
X    mkdata( anum );
X
X    if ( trace && anum )
X        fprintf( stderr, "state # %d accepts: [%d]\n", i, anum );
X    }
X
X    dataend();
X
X    if ( useecs )
X    genecs();
X
X    /* don't have to dump the actual full table entries - they were created
X     * on-the-fly
X     */
X    }
X
X
X/* generate the code to find the next compressed-table state */
X
Xvoid gen_next_compressed_state( char_map )
Xchar *char_map;
X
X    {
X    indent_put2s( "register YY_CHAR yy_c = %s;", char_map );
X
X    /* save the backtracking info \before/ computing the next state
X     * because we always compute one more state than needed - we
X     * always proceed until we reach a jam state
X     */
X    gen_backtracking();
X
X    indent_puts(
X    "while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )" );
X    indent_up();
X    indent_puts( "{" );
X    indent_puts( "yy_current_state = yy_def[yy_current_state];" );
X
X    if ( usemecs )
X    {
X    /* we've arrange it so that templates are never chained
X     * to one another.  This means we can afford make a
X     * very simple test to see if we need to convert to
X     * yy_c's meta-equivalence class without worrying
X     * about erroneously looking up the meta-equivalence
X     * class twice
X     */
X    do_indent();
X    /* lastdfa + 2 is the beginning of the templates */
X    printf( "if ( yy_current_state >= %d )\n", lastdfa + 2 );
X
X    indent_up();
X    indent_puts( "yy_c = yy_meta[yy_c];" );
X    indent_down();
X    }
X
X    indent_puts( "}" );
X    indent_down();
X
X    indent_puts(
X    "yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];" );
X    }
X
X
X/* generate the code to find the next match */
X
Xvoid gen_next_match()
X
X    {
X    /* NOTE - changes in here should be reflected in gen_next_state() and
X     * gen_NUL_trans()
X     */
X    char *char_map = useecs ? "yy_ec[*yy_cp]" : "*yy_cp";
X    char *char_map_2 = useecs ? "yy_ec[*++yy_cp]" : "*++yy_cp";
X
X    if ( fulltbl )
X    {
X    indent_put2s(
X        "while ( (yy_current_state = yy_nxt[yy_current_state][%s]) > 0 )",
X        char_map );
X
X    indent_up();
X
X    if ( num_backtracking > 0 )
X        {
X        indent_puts( "{" );
X        gen_backtracking();
X        putchar( '\n' );
X        }
X
X    indent_puts( "++yy_cp;" );
X
X    if ( num_backtracking > 0 )
X        indent_puts( "}" );
X
X    indent_down();
X
X    putchar( '\n' );
X    indent_puts( "yy_current_state = -yy_current_state;" );
X    }
X
X    else if ( fullspd )
X    {
X    indent_puts( "{" );
X    indent_puts( "register const struct yy_trans_info *yy_trans_info;\n" );
X    indent_puts( "register YY_CHAR yy_c;\n" );
X    indent_put2s( "for ( yy_c = %s;", char_map );
X    indent_puts(
X    "      (yy_trans_info = &yy_current_state[yy_c])->yy_verify == yy_c;" );
X    indent_put2s( "      yy_c = %s )", char_map_2 );
X
X    indent_up();
X
X    if ( num_backtracking > 0 )
X        indent_puts( "{" );
X
X    indent_puts( "yy_current_state += yy_trans_info->yy_nxt;" );
X
X    if ( num_backtracking > 0 )
X        {
X        putchar( '\n' );
X        gen_backtracking();
X        indent_puts( "}" );
X        }
X
X    indent_down();
X    indent_puts( "}" );
X    }
X
X    else
X    { /* compressed */
X    indent_puts( "do" );
X
X    indent_up();
X    indent_puts( "{" );
X
X    gen_next_state( false );
X
X    indent_puts( "++yy_cp;" );
X
X    indent_puts( "}" );
X    indent_down();
X
X    do_indent();
X
X    if ( interactive )
X        printf( "while ( yy_base[yy_current_state] != %d );\n", jambase );
X    else
X        printf( "while ( yy_current_state != %d );\n", jamstate );
X
X    if ( ! reject && ! interactive )
X        {
X        /* do the guaranteed-needed backtrack to figure out the match */
X        indent_puts( "yy_cp = yy_last_accepting_cpos;" );
X        indent_puts( "yy_current_state = yy_last_accepting_state;" );
X        }
X    }
X    }
X
X
X/* generate the code to find the next state */
X
Xvoid gen_next_state( worry_about_NULs )
Xint worry_about_NULs;
X
X    { /* NOTE - changes in here should be reflected in get_next_match() */
X    char char_map[256];
X
X    if ( worry_about_NULs && ! nultrans )
X    {
X    if ( useecs )
X        (void) sprintf( char_map, "(*yy_cp ? yy_ec[*yy_cp] : %d)", NUL_ec );
X    else
X        (void) sprintf( char_map, "(*yy_cp ? *yy_cp : %d)", NUL_ec );
X    }
X
X    else
X    (void) strcpy( char_map, useecs ? "yy_ec[*yy_cp]" : "*yy_cp" );
X
X    if ( worry_about_NULs && nultrans )
X    {
X    if ( ! fulltbl && ! fullspd )
X        /* compressed tables backtrack *before* they match */
X        gen_backtracking();
X
X    indent_puts( "if ( *yy_cp )" );
X    indent_up();
X    indent_puts( "{" );
X    }
X
X    if ( fulltbl )
X    indent_put2s( "yy_current_state = yy_nxt[yy_current_state][%s];",
X        char_map );
X
X    else if ( fullspd )
X    indent_put2s( "yy_current_state += yy_current_state[%s].yy_nxt;",
X            char_map );
X
X    else
X    gen_next_compressed_state( char_map );
X
X    if ( worry_about_NULs && nultrans )
X    {
X    indent_puts( "}" );
X    indent_down();
X    indent_puts( "else" );
X    indent_up();
X    indent_puts( "yy_current_state = yy_NUL_trans[yy_current_state];" );
X    indent_down();
X    }
X
X    if ( fullspd || fulltbl )
X    gen_backtracking();
X
X    if ( reject )
X    indent_puts( "*yy_state_ptr++ = yy_current_state;" );
X    }
X
X
X/* generate the code to make a NUL transition */
X
Xvoid gen_NUL_trans()
X
X    { /* NOTE - changes in here should be reflected in get_next_match() */
X    int need_backtracking = (num_backtracking > 0 && ! reject);
X
X    if ( need_backtracking )
X    /* we'll need yy_cp lying around for the gen_backtracking() */
X    indent_puts( "register YY_CHAR *yy_cp = yy_c_buf_p;" );
X
X    putchar( '\n' );
X
X    if ( nultrans )
X    {
X    indent_puts( "yy_current_state = yy_NUL_trans[yy_current_state];" );
X    indent_puts( "yy_is_jam = (yy_current_state == 0);" );
X    }
X
X    else if ( fulltbl )
X    {
X    do_indent();
X    printf( "yy_current_state = yy_nxt[yy_current_state][%d];\n",
X        NUL_ec );
X    indent_puts( "yy_is_jam = (yy_current_state <= 0);" );
X    }
X
X    else if ( fullspd )
X    {
X    do_indent();
X    printf( "register int yy_c = %d;\n", NUL_ec );
X
X    indent_puts(
X        "register const struct yy_trans_info *yy_trans_info;\n" );
X    indent_puts( "yy_trans_info = &yy_current_state[yy_c];" );
X    indent_puts( "yy_current_state += yy_trans_info->yy_nxt;" );
X
X    indent_puts( "yy_is_jam = (yy_trans_info->yy_verify != yy_c);" );
X    }
X
X    else
X    {
X    char NUL_ec_str[20];
X
X    (void) sprintf( NUL_ec_str, "%d", NUL_ec );
X    gen_next_compressed_state( NUL_ec_str );
X
X    if ( reject )
X        indent_puts( "*yy_state_ptr++ = yy_current_state;" );
X
X    do_indent();
X
X    if ( interactive )
X        printf( "yy_is_jam = (yy_base[yy_current_state] == %d);\n",
X            jambase );
X    else
X        printf( "yy_is_jam = (yy_current_state == %d);\n", jamstate );
X    }
X
X    /* if we've entered an accepting state, backtrack; note that
X     * compressed tables have *already* done such backtracking, so
X     * we needn't bother with it again
X     */
X    if ( need_backtracking && (fullspd || fulltbl) )
X    {
X    putchar( '\n' );
X    indent_puts( "if ( ! yy_is_jam )" );
X    indent_up();
X    indent_puts( "{" );
X    gen_backtracking();
X    indent_puts( "}" );
X    indent_down();
X    }
X    }
X
X
X/* generate the code to find the start state */
X
Xvoid gen_start_state()
X
X    {
X    if ( fullspd )
X    indent_put2s( "yy_current_state = yy_start_state_list[yy_start%s];",
X        bol_needed ? " + (yy_bp[-1] == '\\n' ? 1 : 0)" : "" );
X
X    else
X    {
X    indent_puts( "yy_current_state = yy_start;" );
X
X    if ( bol_needed )
X        {
X        indent_puts( "if ( yy_bp[-1] == '\\n' )" );
X        indent_up();
X        indent_puts( "++yy_current_state;" );
X        indent_down();
X        }
X
X    if ( reject )
X        {
X        /* set up for storing up states */
X        indent_puts( "yy_state_ptr = yy_state_buf;" );
X        indent_puts( "*yy_state_ptr++ = yy_current_state;" );
X        }
X    }
X    }
X
X
X/* gentabs - generate data statements for the transition tables
X *
X * synopsis
X *    gentabs();
X */
X
Xvoid gentabs()
X
X    {
X    int i, j, k, *accset, nacc, *acc_array, total_states;
X    int end_of_buffer_action = num_rules + 1;
X
X    /* *everything* is done in terms of arrays starting at 1, so provide
X     * a null entry for the zero element of all C arrays
X     */
X    static char C_char_decl[] =
X    "static const YY_CHAR %s[%d] =\n    {   0,\n";
X
X    acc_array = allocate_integer_array( current_max_dfas );
X    nummt = 0;
X
X    /* the compressed table format jams by entering the "jam state",
X     * losing information about the previous state in the process.
X     * In order to recover the previous state, we effectively need
X     * to keep backtracking information.
X     */
X    ++num_backtracking;
X
X    if ( reject )
X    {
X    /* write out accepting list and pointer list
X     *
X     * first we generate the "yy_acclist" array.  In the process, we compute
X     * the indices that will go into the "yy_accept" array, and save the
X     * indices in the dfaacc array
X     */
X    int EOB_accepting_list[2];
X
X    /* set up accepting structures for the End Of Buffer state */
X    EOB_accepting_list[0] = 0;
X    EOB_accepting_list[1] = end_of_buffer_action;
X    accsiz[end_of_buffer_state] = 1;
X    dfaacc[end_of_buffer_state].dfaacc_set = EOB_accepting_list;
X
X    printf( C_short_decl, "yy_acclist", max( numas, 1 ) + 1 );
X
X    j = 1;    /* index into "yy_acclist" array */
X
X    for ( i = 1; i <= lastdfa; ++i )
X        {
X        acc_array[i] = j;
X
X        if ( accsiz[i] != 0 )
X        {
X        accset = dfaacc[i].dfaacc_set;
X        nacc = accsiz[i];
X
X        if ( trace )
X            fprintf( stderr, "state # %d accepts: ", i );
X
X        for ( k = 1; k <= nacc; ++k )
X            {
X            int accnum = accset[k];
X
X            ++j;
X
X            if ( variable_trailing_context_rules &&
X             ! (accnum & YY_TRAILING_HEAD_MASK) &&
X             accnum > 0 &&
X             rule_type[accnum] == RULE_VARIABLE )
X            {
X            /* special hack to flag accepting number as part
X             * of trailing context rule
X             */
X            accnum |= YY_TRAILING_MASK;
X            }
X
X            mkdata( accnum );
X
X            if ( trace )
X            {
X            fprintf( stderr, "[%d]", accset[k] );
X
X            if ( k < nacc )
X                fputs( ", ", stderr );
X            else
X                putc( '\n', stderr );
X            }
X            }
X        }
X        }
X
X    /* add accepting number for the "jam" state */
X    acc_array[i] = j;
X
X    dataend();
X    }
X
X    else
X    {
X    dfaacc[end_of_buffer_state].dfaacc_state = end_of_buffer_action;
X
X    for ( i = 1; i <= lastdfa; ++i )
X        acc_array[i] = dfaacc[i].dfaacc_state;
X
X    /* add accepting number for jam state */
X    acc_array[i] = 0;
X    }
X
X    /* spit out "yy_accept" array.  If we're doing "reject", it'll be pointers
X     * into the "yy_acclist" array.  Otherwise it's actual accepting numbers.
X     * In either case, we just dump the numbers.
X     */
X
X    /* "lastdfa + 2" is the size of "yy_accept"; includes room for C arrays
X     * beginning at 0 and for "jam" state
X     */
X    k = lastdfa + 2;
X
X    if ( reject )
X    /* we put a "cap" on the table associating lists of accepting
X     * numbers with state numbers.  This is needed because we tell
X     * where the end of an accepting list is by looking at where
X     * the list for the next state starts.
X     */
X    ++k;
X
X    printf( C_short_decl, "yy_accept", k );
X
X    for ( i = 1; i <= lastdfa; ++i )
X    {
X    mkdata( acc_array[i] );
X
X    if ( ! reject && trace && acc_array[i] )
X        fprintf( stderr, "state # %d accepts: [%d]\n", i, acc_array[i] );
X    }
X
X    /* add entry for "jam" state */
X    mkdata( acc_array[i] );
X
X    if ( reject )
X    /* add "cap" for the list */
X    mkdata( acc_array[i] );
X
X    dataend();
X
X    if ( useecs )
X    genecs();
X
X    if ( usemecs )
X    {
X    /* write out meta-equivalence classes (used to index templates with) */
X
X    if ( trace )
X        fputs( "\n\nMeta-Equivalence Classes:\n", stderr );
X
X    printf( C_char_decl, "yy_meta", numecs + 1 );
X
X    for ( i = 1; i <= numecs; ++i )
X        {
X        if ( trace )
X        fprintf( stderr, "%d = %d\n", i, abs( tecbck[i] ) );
X
X        mkdata( abs( tecbck[i] ) );
X        }
X
X    dataend();
X    }
X
X    total_states = lastdfa + numtemps;
X
X    printf( tblend > MAX_SHORT ? C_long_decl : C_short_decl,
X        "yy_base", total_states + 1 );
X
X    for ( i = 1; i <= lastdfa; ++i )
X    {
X    register int d = def[i];
X
X    if ( base[i] == JAMSTATE )
X        base[i] = jambase;
X
X    if ( d == JAMSTATE )
X        def[i] = jamstate;
X
X    else if ( d < 0 )
X        {
X        /* template reference */
X        ++tmpuses;
X        def[i] = lastdfa - d + 1;
X        }
X
X    mkdata( base[i] );
X    }
X
X    /* generate jam state's base index */
X    mkdata( base[i] );
X
X    for ( ++i /* skip jam state */; i <= total_states; ++i )
X    {
X    mkdata( base[i] );
X    def[i] = jamstate;
X    }
X
X    dataend();
X
X    printf( tblend > MAX_SHORT ? C_long_decl : C_short_decl,
X        "yy_def", total_states + 1 );
X
X    for ( i = 1; i <= total_states; ++i )
X    mkdata( def[i] );
X
X    dataend();
X
X    printf( lastdfa > MAX_SHORT ? C_long_decl : C_short_decl,
X        "yy_nxt", tblend + 1 );
X
X    for ( i = 1; i <= tblend; ++i )
X    {
X    if ( nxt[i] == 0 || chk[i] == 0 )
X        nxt[i] = jamstate;    /* new state is the JAM state */
X
X    mkdata( nxt[i] );
X    }
X
X    dataend();
X
X    printf( lastdfa > MAX_SHORT ? C_long_decl : C_short_decl,
X        "yy_chk", tblend + 1 );
X
X    for ( i = 1; i <= tblend; ++i )
X    {
X    if ( chk[i] == 0 )
X        ++nummt;
X
X    mkdata( chk[i] );
X    }
X
X    dataend();
X    }
X
X
X/* write out a formatted string (with a secondary string argument) at the
X * current indentation level, adding a final newline
X */
X
Xvoid indent_put2s( fmt, arg )
Xchar fmt[], arg[];
X
X    {
X    do_indent();
X    printf( fmt, arg );
X    putchar( '\n' );
X    }
X
X
X/* write out a string at the current indentation level, adding a final
X * newline
X */
X
Xvoid indent_puts( str )
Xchar str[];
X
X    {
X    do_indent();
X    puts( str );
X    }
X
X
X/* make_tables - generate transition tables
X *
X * synopsis
X *     make_tables();
X *
X * Generates transition tables and finishes generating output file
X */
X
Xvoid make_tables()
X
X    {
X    register int i;
X    int did_eof_rule = false;
X
X    skelout();
X
X    /* first, take care of YY_DO_BEFORE_ACTION depending on yymore being used */
X    set_indent( 2 );
X
X    if ( yymore_used )
X    {
X    indent_puts( "yytext -= yy_more_len; \\" );
X    indent_puts( "yyleng = yy_cp - yytext; \\" );
X    }
X
X    else
X    indent_puts( "yyleng = yy_cp - yy_bp; \\" );
X
X    set_indent( 0 );
X
X    skelout();
X
X
X    printf( "#define YY_END_OF_BUFFER %d\n", num_rules + 1 );
X
X    if ( fullspd )
X    { /* need to define the transet type as a size large
X       * enough to hold the biggest offset
X       */
X    int total_table_size = tblend + numecs + 1;
X    char *trans_offset_type =
X        total_table_size > MAX_SHORT ? "long" : "short";
X
X    set_indent( 0 );
X    indent_puts( "struct yy_trans_info" );
X    indent_up();
X        indent_puts( "{" );
X        indent_puts( "short yy_verify;" );
X
X        /* in cases where its sister yy_verify *is* a "yes, there is a
X     * transition", yy_nxt is the offset (in records) to the next state.
X     * In most cases where there is no transition, the value of yy_nxt
X     * is irrelevant.  If yy_nxt is the -1th  record of a state, though,
X     * then yy_nxt is the action number for that state
X         */
X
X        indent_put2s( "%s yy_nxt;", trans_offset_type );
X        indent_puts( "};" );
X    indent_down();
X
X    indent_puts( "typedef const struct yy_trans_info *yy_state_type;" );
X    }
X
X    else
X    indent_puts( "typedef int yy_state_type;" );
X
X    if ( fullspd )
X    genctbl();
X
X    else if ( fulltbl )
X    genftbl();
X
X    else
X    gentabs();
X
X    if ( num_backtracking > 0 )
X    {
X    indent_puts( "static yy_state_type yy_last_accepting_state;" );
X    indent_puts( "static YY_CHAR *yy_last_accepting_cpos;\n" );
X    }
X
X    if ( nultrans )
X    {
X    printf( C_state_decl, "yy_NUL_trans", lastdfa + 1 );
X
X    for ( i = 1; i <= lastdfa; ++i )
X        {
X        if ( fullspd )
X        {
X        if ( nultrans )
X            printf( "    &yy_transition[%d],\n", base[i] );
X        else
X            printf( "    0,\n" );
X        }
X
X        else
X        mkdata( nultrans[i] );
X        }
X
X    dataend();
X    }
X
X    if ( ddebug )
X    { /* spit out table mapping rules to line numbers */
X    indent_puts( "extern int yy_flex_debug;" );
X    indent_puts( "int yy_flex_debug = 1;\n" );
X
X    printf( C_short_decl, "yy_rule_linenum", num_rules );
X    for ( i = 1; i < num_rules; ++i )
X        mkdata( rule_linenum[i] );
X    dataend();
X    }
X
X    if ( reject )
X    {
X    /* declare state buffer variables */
X    puts(
X    "static yy_state_type yy_state_buf[YY_BUF_SIZE + 2], *yy_state_ptr;" );
X    puts( "static YY_CHAR *yy_full_match;" );
X    puts( "static int yy_lp;" );
X
X    if ( variable_trailing_context_rules )
X        {
X        puts( "static int yy_looking_for_trail_begin = 0;" );
X        puts( "static int yy_full_lp;" );
X        puts( "static int *yy_full_state;" );
X        printf( "#define YY_TRAILING_MASK 0x%x\n", YY_TRAILING_MASK );
X        printf( "#define YY_TRAILING_HEAD_MASK 0x%x\n",
X            YY_TRAILING_HEAD_MASK );
X        }
X
X    puts( "#define REJECT \\" );
X        puts( "{ \\" );
X        puts(
X    "*yy_cp = yy_hold_char; /* undo effects of setting up yytext */ \\" );
X        puts(
X        "yy_cp = yy_full_match; /* restore poss. backed-over text */ \\" );
X
X    if ( variable_trailing_context_rules )
X        {
X        puts( "yy_lp = yy_full_lp; /* restore orig. accepting pos. */ \\" );
X        puts(
X        "yy_state_ptr = yy_full_state; /* restore orig. state */ \\" );
X        puts(
X        "yy_current_state = *yy_state_ptr; /* restore curr. state */ \\" );
X        }
X
X        puts( "++yy_lp; \\" );
X        puts( "goto find_rule; \\" );
X        puts( "}" );
X    }
X
X    else
X    {
X    puts( "/* the intent behind this definition is that it'll catch" );
X    puts( " * any uses of REJECT which flex missed" );
X    puts( " */" );
X    puts( "#define REJECT reject_used_but_not_detected" );
X    }
X
X    if ( yymore_used )
X    {
X    indent_puts( "static int yy_more_flag = 0;" );
X    indent_puts( "static int yy_doing_yy_more = 0;" );
X    indent_puts( "static int yy_more_len = 0;" );
X    indent_puts(
X        "#define yymore() { yy_more_flag = 1; }" );
X    indent_puts(
X        "#define YY_MORE_ADJ (yy_doing_yy_more ? yy_more_len : 0)" );
X    }
X
X    else
X    {
X    indent_puts( "#define yymore() yymore_used_but_not_detected" );
X    indent_puts( "#define YY_MORE_ADJ 0" );
X    }
X
X    skelout();
X
X    if ( ferror( temp_action_file ) )
X    flexfatal( "error occurred when writing temporary action file" );
X
X    else if ( fclose( temp_action_file ) )
X    flexfatal( "error occurred when closing temporary action file" );
X
X    temp_action_file = fopen( action_file_name, "r" );
X
X    if ( temp_action_file == NULL )
X    flexfatal( "could not re-open temporary action file" );
X
X    /* copy prolog from action_file to output file */
X    action_out();
X
X    skelout();
X
X    set_indent( 2 );
X
X    if ( yymore_used )
X    {
X    indent_puts( "yy_doing_yy_more = yy_more_flag;" );
X    indent_puts( "if ( yy_doing_yy_more )" );
X    indent_up();
X    indent_puts( "{" );
X    indent_puts( "yy_more_len = yyleng;" );
X    indent_puts( "yy_more_flag = 0;" );
X    indent_puts( "}" );
X    indent_down();
X    }
X
X    skelout();
X
X    gen_start_state();
X
X    /* note, don't use any indentation */
X    puts( "yy_match:" );
X    gen_next_match();
X
X    skelout();
X    set_indent( 2 );
X    gen_find_action();
X
X    skelout();
X    if ( ddebug )
X    {
X    indent_puts( "if ( yy_flex_debug )" );
X    indent_up();
X
X    indent_puts( "{" );
X    indent_puts( "if ( yy_act == 0 )" );
X    indent_up();
X    indent_puts( "fprintf( stderr, \"--scanner backtracking\\n\" );" );
X    indent_down();
X
X    do_indent();
X    printf( "else if ( yy_act < %d )\n", num_rules );
X    indent_up();
X    indent_puts(
X    "fprintf( stderr, \"--accepting rule at line %d (\\\"%s\\\")\\n\"," );
X    indent_puts( "         yy_rule_linenum[yy_act], yytext );" );
X    indent_down();
X
X    do_indent();
X    printf( "else if ( yy_act == %d )\n", num_rules );
X    indent_up();
X    indent_puts(
X    "fprintf( stderr, \"--accepting default rule (\\\"%s\\\")\\n\"," );
X    indent_puts( "         yytext );" );
X    indent_down();
X
X    do_indent();
X    printf( "else if ( yy_act == %d )\n", num_rules + 1 );
X    indent_up();
X    indent_puts( "fprintf( stderr, \"--(end of buffer or a NUL)\\n\" );" );
X    indent_down();
X
X    do_indent();
X    printf( "else\n" );
X    indent_up();
X    indent_puts( "fprintf( stderr, \"--EOF\\n\" );" );
X    indent_down();
X
X    indent_puts( "}" );
X    indent_down();
X    }
X
X    /* copy actions from action_file to output file */
X    skelout();
X    indent_up();
X    gen_bt_action();
X    action_out();
X
X    /* generate cases for any missing EOF rules */
X    for ( i = 1; i <= lastsc; ++i )
X    if ( ! sceof[i] )
X        {
X        do_indent();
X        printf( "case YY_STATE_EOF(%s):\n", scname[i] );
X        did_eof_rule = true;
X        }
X
X    if ( did_eof_rule )
X    {
X    indent_up();
X    indent_puts( "yyterminate();" );
X    indent_down();
X    }
X
X
X    /* generate code for handling NUL's, if needed */
X
X    /* first, deal with backtracking and setting up yy_cp if the scanner
X     * finds that it should JAM on the NUL
X     */
X    skelout();
X    set_indent( 7 );
X
X    if ( fullspd || fulltbl )
X    indent_puts( "yy_cp = yy_c_buf_p;" );
X
X    else
X    { /* compressed table */
X    if ( ! reject && ! interactive )
X        {
X        /* do the guaranteed-needed backtrack to figure out the match */
X        indent_puts( "yy_cp = yy_last_accepting_cpos;" );
X        indent_puts( "yy_current_state = yy_last_accepting_state;" );
X        }
X    }
X
X
X    /* generate code for yy_get_previous_state() */
X    set_indent( 1 );
X    skelout();
X
X    if ( bol_needed )
X    indent_puts( "register YY_CHAR *yy_bp = yytext;\n" );
X
X    gen_start_state();
X
X    set_indent( 2 );
X    skelout();
X    gen_next_state( true );
X
X    set_indent( 1 );
X    skelout();
X    gen_NUL_trans();
X
X    skelout();
X
X    /* copy remainder of input to output */
X
X    line_directive_out( stdout );
X    (void) flexscan(); /* copy remainder of input to output */
X    }
END_OF_FILE
if test 31559 -ne `wc -c <'gen.c'`; then
    echo shar: \"'gen.c'\" unpacked with wrong size!
fi
# end of 'gen.c'
fi
echo shar: End of archive 7 \(of 13\).
cp /dev/null ark7isdone
MISSING=""
for I in 1 2 3 4 5 6 7 8 9 10 11 12 13 ; do
    if test ! -f ark${I}isdone ; then
    MISSING="${MISSING} ${I}"
    fi
done
if test "${MISSING}" = "" ; then
    echo You have unpacked all 13 archives.
    rm -f ark[1-9]isdone ark[1-9][0-9]isdone
else
    echo You still need to unpack the following archives:
    echo "        " ${MISSING}
fi
##  End of shell archive.
exit 0
--
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