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ack/util/flex/gen.c
ceriel 29b2e6e3d4 initial version
1991-01-16 16:07:50 +00:00

1336 lines
31 KiB
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/* gen - actual generation (writing) of flex scanners */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Vern Paxson.
*
* The United States Government has rights in this work pursuant
* to contract no. DE-AC03-76SF00098 between the United States
* Department of Energy and the University of California.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* Neither the name of the University nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char rcsid[] =
"@(#) $Header$ (LBL)";
#endif
#include "flexdef.h"
/* declare functions that have forward references */
void gen_next_state PROTO((int));
void genecs PROTO(());
void indent_put2s PROTO((char [], char []));
void indent_puts PROTO((char []));
static int indent_level = 0; /* each level is 4 spaces */
#define indent_up() (++indent_level)
#define indent_down() (--indent_level)
#define set_indent(indent_val) indent_level = indent_val
/* *everything* is done in terms of arrays starting at 1, so provide
* a null entry for the zero element of all C arrays
*/
static char C_short_decl[] = "static const short int %s[%d] =\n { 0,\n";
static char C_long_decl[] = "static const long int %s[%d] =\n { 0,\n";
static char C_state_decl[] =
"static const yy_state_type %s[%d] =\n { 0,\n";
/* indent to the current level */
void do_indent()
{
register int i = indent_level * 4;
while ( i >= 8 )
{
putchar( '\t' );
i -= 8;
}
while ( i > 0 )
{
putchar( ' ' );
--i;
}
}
/* generate the code to keep backtracking information */
void gen_backtracking()
{
if ( reject || num_backtracking == 0 )
return;
if ( fullspd )
indent_puts( "if ( yy_current_state[-1].yy_nxt )" );
else
indent_puts( "if ( yy_accept[yy_current_state] )" );
indent_up();
indent_puts( "{" );
indent_puts( "yy_last_accepting_state = yy_current_state;" );
indent_puts( "yy_last_accepting_cpos = yy_cp;" );
indent_puts( "}" );
indent_down();
}
/* generate the code to perform the backtrack */
void gen_bt_action()
{
if ( reject || num_backtracking == 0 )
return;
set_indent( 3 );
indent_puts( "case 0: /* must backtrack */" );
indent_puts( "/* undo the effects of YY_DO_BEFORE_ACTION */" );
indent_puts( "*yy_cp = yy_hold_char;" );
if ( fullspd || fulltbl )
indent_puts( "yy_cp = yy_last_accepting_cpos + 1;" );
else
/* backtracking info for compressed tables is taken \after/
* yy_cp has been incremented for the next state
*/
indent_puts( "yy_cp = yy_last_accepting_cpos;" );
indent_puts( "yy_current_state = yy_last_accepting_state;" );
indent_puts( "goto yy_find_action;" );
putchar( '\n' );
set_indent( 0 );
}
/* genctbl - generates full speed compressed transition table
*
* synopsis
* genctbl();
*/
void genctbl()
{
register int i;
int end_of_buffer_action = num_rules + 1;
/* table of verify for transition and offset to next state */
printf( "static const struct yy_trans_info yy_transition[%d] =\n",
tblend + numecs + 1 );
printf( " {\n" );
/* We want the transition to be represented as the offset to the
* next state, not the actual state number, which is what it currently is.
* The offset is base[nxt[i]] - base[chk[i]]. That's just the
* difference between the starting points of the two involved states
* (to - from).
*
* first, though, we need to find some way to put in our end-of-buffer
* flags and states. We do this by making a state with absolutely no
* transitions. We put it at the end of the table.
*/
/* at this point, we're guaranteed that there's enough room in nxt[]
* and chk[] to hold tblend + numecs entries. We need just two slots.
* One for the action and one for the end-of-buffer transition. We
* now *assume* that we're guaranteed the only character we'll try to
* index this nxt/chk pair with is EOB, i.e., 0, so we don't have to
* make sure there's room for jam entries for other characters.
*/
base[lastdfa + 1] = tblend + 2;
nxt[tblend + 1] = end_of_buffer_action;
chk[tblend + 1] = numecs + 1;
chk[tblend + 2] = 1; /* anything but EOB */
nxt[tblend + 2] = 0; /* so that "make test" won't show arb. differences */
/* make sure every state has a end-of-buffer transition and an action # */
for ( i = 0; i <= lastdfa; ++i )
{
register int anum = dfaacc[i].dfaacc_state;
chk[base[i]] = EOB_POSITION;
chk[base[i] - 1] = ACTION_POSITION;
nxt[base[i] - 1] = anum; /* action number */
}
for ( i = 0; i <= tblend; ++i )
{
if ( chk[i] == EOB_POSITION )
transition_struct_out( 0, base[lastdfa + 1] - i );
else if ( chk[i] == ACTION_POSITION )
transition_struct_out( 0, nxt[i] );
else if ( chk[i] > numecs || chk[i] == 0 )
transition_struct_out( 0, 0 ); /* unused slot */
else /* verify, transition */
transition_struct_out( chk[i], base[nxt[i]] - (i - chk[i]) );
}
/* here's the final, end-of-buffer state */
transition_struct_out( chk[tblend + 1], nxt[tblend + 1] );
transition_struct_out( chk[tblend + 2], nxt[tblend + 2] );
printf( " };\n" );
printf( "\n" );
/* table of pointers to start states */
printf( "static const struct yy_trans_info *yy_start_state_list[%d] =\n",
lastsc * 2 + 1 );
printf( " {\n" );
for ( i = 0; i <= lastsc * 2; ++i )
printf( " &yy_transition[%d],\n", base[i] );
dataend();
if ( useecs )
genecs();
}
/* generate equivalence-class tables */
void genecs()
{
register int i, j;
static char C_char_decl[] = "static const %s %s[%d] =\n { 0,\n";
int numrows;
Char clower();
if ( numecs < csize )
printf( C_char_decl, "YY_CHAR", "yy_ec", csize );
else
printf( C_char_decl, "short", "yy_ec", csize );
for ( i = 1; i < csize; ++i )
{
if ( caseins && (i >= 'A') && (i <= 'Z') )
ecgroup[i] = ecgroup[clower( i )];
ecgroup[i] = abs( ecgroup[i] );
mkdata( ecgroup[i] );
}
dataend();
if ( trace )
{
char *readable_form();
fputs( "\n\nEquivalence Classes:\n\n", stderr );
numrows = csize / 8;
for ( j = 0; j < numrows; ++j )
{
for ( i = j; i < csize; i = i + numrows )
{
fprintf( stderr, "%4s = %-2d", readable_form( i ), ecgroup[i] );
putc( ' ', stderr );
}
putc( '\n', stderr );
}
}
}
/* generate the code to find the action number */
void gen_find_action()
{
if ( fullspd )
indent_puts( "yy_act = yy_current_state[-1].yy_nxt;" );
else if ( fulltbl )
indent_puts( "yy_act = yy_accept[yy_current_state];" );
else if ( reject )
{
indent_puts( "yy_current_state = *--yy_state_ptr;" );
indent_puts( "yy_lp = yy_accept[yy_current_state];" );
puts( "find_rule: /* we branch to this label when backtracking */" );
indent_puts( "for ( ; ; ) /* until we find what rule we matched */" );
indent_up();
indent_puts( "{" );
indent_puts( "if ( yy_lp && yy_lp < yy_accept[yy_current_state + 1] )" );
indent_up();
indent_puts( "{" );
indent_puts( "yy_act = yy_acclist[yy_lp];" );
if ( variable_trailing_context_rules )
{
indent_puts( "if ( yy_act & YY_TRAILING_HEAD_MASK ||" );
indent_puts( " yy_looking_for_trail_begin )" );
indent_up();
indent_puts( "{" );
indent_puts( "if ( yy_act == yy_looking_for_trail_begin )" );
indent_up();
indent_puts( "{" );
indent_puts( "yy_looking_for_trail_begin = 0;" );
indent_puts( "yy_act &= ~YY_TRAILING_HEAD_MASK;" );
indent_puts( "break;" );
indent_puts( "}" );
indent_down();
indent_puts( "}" );
indent_down();
indent_puts( "else if ( yy_act & YY_TRAILING_MASK )" );
indent_up();
indent_puts( "{" );
indent_puts(
"yy_looking_for_trail_begin = yy_act & ~YY_TRAILING_MASK;" );
indent_puts(
"yy_looking_for_trail_begin |= YY_TRAILING_HEAD_MASK;" );
if ( real_reject )
{
/* remember matched text in case we back up due to REJECT */
indent_puts( "yy_full_match = yy_cp;" );
indent_puts( "yy_full_state = yy_state_ptr;" );
indent_puts( "yy_full_lp = yy_lp;" );
}
indent_puts( "}" );
indent_down();
indent_puts( "else" );
indent_up();
indent_puts( "{" );
indent_puts( "yy_full_match = yy_cp;" );
indent_puts( "yy_full_state = yy_state_ptr;" );
indent_puts( "yy_full_lp = yy_lp;" );
indent_puts( "break;" );
indent_puts( "}" );
indent_down();
indent_puts( "++yy_lp;" );
indent_puts( "goto find_rule;" );
}
else
{
/* remember matched text in case we back up due to trailing context
* plus REJECT
*/
indent_up();
indent_puts( "{" );
indent_puts( "yy_full_match = yy_cp;" );
indent_puts( "break;" );
indent_puts( "}" );
indent_down();
}
indent_puts( "}" );
indent_down();
indent_puts( "--yy_cp;" );
/* we could consolidate the following two lines with those at
* the beginning, but at the cost of complaints that we're
* branching inside a loop
*/
indent_puts( "yy_current_state = *--yy_state_ptr;" );
indent_puts( "yy_lp = yy_accept[yy_current_state];" );
indent_puts( "}" );
indent_down();
}
else
/* compressed */
indent_puts( "yy_act = yy_accept[yy_current_state];" );
}
/* genftbl - generates full transition table
*
* synopsis
* genftbl();
*/
void genftbl()
{
register int i;
int end_of_buffer_action = num_rules + 1;
printf( C_short_decl, "yy_accept", lastdfa + 1 );
dfaacc[end_of_buffer_state].dfaacc_state = end_of_buffer_action;
for ( i = 1; i <= lastdfa; ++i )
{
register int anum = dfaacc[i].dfaacc_state;
mkdata( anum );
if ( trace && anum )
fprintf( stderr, "state # %d accepts: [%d]\n", i, anum );
}
dataend();
if ( useecs )
genecs();
/* don't have to dump the actual full table entries - they were created
* on-the-fly
*/
}
/* generate the code to find the next compressed-table state */
void gen_next_compressed_state( char_map )
char *char_map;
{
indent_put2s( "register YY_CHAR yy_c = %s;", char_map );
/* save the backtracking info \before/ computing the next state
* because we always compute one more state than needed - we
* always proceed until we reach a jam state
*/
gen_backtracking();
indent_puts(
"while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )" );
indent_up();
indent_puts( "{" );
indent_puts( "yy_current_state = yy_def[yy_current_state];" );
if ( usemecs )
{
/* we've arrange it so that templates are never chained
* to one another. This means we can afford make a
* very simple test to see if we need to convert to
* yy_c's meta-equivalence class without worrying
* about erroneously looking up the meta-equivalence
* class twice
*/
do_indent();
/* lastdfa + 2 is the beginning of the templates */
printf( "if ( yy_current_state >= %d )\n", lastdfa + 2 );
indent_up();
indent_puts( "yy_c = yy_meta[yy_c];" );
indent_down();
}
indent_puts( "}" );
indent_down();
indent_puts(
"yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];" );
}
/* generate the code to find the next match */
void gen_next_match()
{
/* NOTE - changes in here should be reflected in gen_next_state() and
* gen_NUL_trans()
*/
char *char_map = useecs ? "yy_ec[*yy_cp]" : "*yy_cp";
char *char_map_2 = useecs ? "yy_ec[*++yy_cp]" : "*++yy_cp";
if ( fulltbl )
{
indent_put2s(
"while ( (yy_current_state = yy_nxt[yy_current_state][%s]) > 0 )",
char_map );
indent_up();
if ( num_backtracking > 0 )
{
indent_puts( "{" );
gen_backtracking();
putchar( '\n' );
}
indent_puts( "++yy_cp;" );
if ( num_backtracking > 0 )
indent_puts( "}" );
indent_down();
putchar( '\n' );
indent_puts( "yy_current_state = -yy_current_state;" );
}
else if ( fullspd )
{
indent_puts( "{" );
indent_puts( "register const struct yy_trans_info *yy_trans_info;\n" );
indent_puts( "register YY_CHAR yy_c;\n" );
indent_put2s( "for ( yy_c = %s;", char_map );
indent_puts(
" (yy_trans_info = &yy_current_state[yy_c])->yy_verify == yy_c;" );
indent_put2s( " yy_c = %s )", char_map_2 );
indent_up();
if ( num_backtracking > 0 )
indent_puts( "{" );
indent_puts( "yy_current_state += yy_trans_info->yy_nxt;" );
if ( num_backtracking > 0 )
{
putchar( '\n' );
gen_backtracking();
indent_puts( "}" );
}
indent_down();
indent_puts( "}" );
}
else
{ /* compressed */
indent_puts( "do" );
indent_up();
indent_puts( "{" );
gen_next_state( false );
indent_puts( "++yy_cp;" );
indent_puts( "}" );
indent_down();
do_indent();
if ( interactive )
printf( "while ( yy_base[yy_current_state] != %d );\n", jambase );
else
printf( "while ( yy_current_state != %d );\n", jamstate );
if ( ! reject && ! interactive )
{
/* do the guaranteed-needed backtrack to figure out the match */
indent_puts( "yy_cp = yy_last_accepting_cpos;" );
indent_puts( "yy_current_state = yy_last_accepting_state;" );
}
}
}
/* generate the code to find the next state */
void gen_next_state( worry_about_NULs )
int worry_about_NULs;
{ /* NOTE - changes in here should be reflected in get_next_match() */
char char_map[256];
if ( worry_about_NULs && ! nultrans )
{
if ( useecs )
(void) sprintf( char_map, "(*yy_cp ? yy_ec[*yy_cp] : %d)", NUL_ec );
else
(void) sprintf( char_map, "(*yy_cp ? *yy_cp : %d)", NUL_ec );
}
else
(void) strcpy( char_map, useecs ? "yy_ec[*yy_cp]" : "*yy_cp" );
if ( worry_about_NULs && nultrans )
{
if ( ! fulltbl && ! fullspd )
/* compressed tables backtrack *before* they match */
gen_backtracking();
indent_puts( "if ( *yy_cp )" );
indent_up();
indent_puts( "{" );
}
if ( fulltbl )
indent_put2s( "yy_current_state = yy_nxt[yy_current_state][%s];",
char_map );
else if ( fullspd )
indent_put2s( "yy_current_state += yy_current_state[%s].yy_nxt;",
char_map );
else
gen_next_compressed_state( char_map );
if ( worry_about_NULs && nultrans )
{
indent_puts( "}" );
indent_down();
indent_puts( "else" );
indent_up();
indent_puts( "yy_current_state = yy_NUL_trans[yy_current_state];" );
indent_down();
}
if ( fullspd || fulltbl )
gen_backtracking();
if ( reject )
indent_puts( "*yy_state_ptr++ = yy_current_state;" );
}
/* generate the code to make a NUL transition */
void gen_NUL_trans()
{ /* NOTE - changes in here should be reflected in get_next_match() */
int need_backtracking = (num_backtracking > 0 && ! reject);
if ( need_backtracking )
/* we'll need yy_cp lying around for the gen_backtracking() */
indent_puts( "register YY_CHAR *yy_cp = yy_c_buf_p;" );
putchar( '\n' );
if ( nultrans )
{
indent_puts( "yy_current_state = yy_NUL_trans[yy_current_state];" );
indent_puts( "yy_is_jam = (yy_current_state == 0);" );
}
else if ( fulltbl )
{
do_indent();
printf( "yy_current_state = yy_nxt[yy_current_state][%d];\n",
NUL_ec );
indent_puts( "yy_is_jam = (yy_current_state <= 0);" );
}
else if ( fullspd )
{
do_indent();
printf( "register int yy_c = %d;\n", NUL_ec );
indent_puts(
"register const struct yy_trans_info *yy_trans_info;\n" );
indent_puts( "yy_trans_info = &yy_current_state[yy_c];" );
indent_puts( "yy_current_state += yy_trans_info->yy_nxt;" );
indent_puts( "yy_is_jam = (yy_trans_info->yy_verify != yy_c);" );
}
else
{
char NUL_ec_str[20];
(void) sprintf( NUL_ec_str, "%d", NUL_ec );
gen_next_compressed_state( NUL_ec_str );
if ( reject )
indent_puts( "*yy_state_ptr++ = yy_current_state;" );
do_indent();
if ( interactive )
printf( "yy_is_jam = (yy_base[yy_current_state] == %d);\n",
jambase );
else
printf( "yy_is_jam = (yy_current_state == %d);\n", jamstate );
}
/* if we've entered an accepting state, backtrack; note that
* compressed tables have *already* done such backtracking, so
* we needn't bother with it again
*/
if ( need_backtracking && (fullspd || fulltbl) )
{
putchar( '\n' );
indent_puts( "if ( ! yy_is_jam )" );
indent_up();
indent_puts( "{" );
gen_backtracking();
indent_puts( "}" );
indent_down();
}
}
/* generate the code to find the start state */
void gen_start_state()
{
if ( fullspd )
indent_put2s( "yy_current_state = yy_start_state_list[yy_start%s];",
bol_needed ? " + (yy_bp[-1] == '\\n' ? 1 : 0)" : "" );
else
{
indent_puts( "yy_current_state = yy_start;" );
if ( bol_needed )
{
indent_puts( "if ( yy_bp[-1] == '\\n' )" );
indent_up();
indent_puts( "++yy_current_state;" );
indent_down();
}
if ( reject )
{
/* set up for storing up states */
indent_puts( "yy_state_ptr = yy_state_buf;" );
indent_puts( "*yy_state_ptr++ = yy_current_state;" );
}
}
}
/* gentabs - generate data statements for the transition tables
*
* synopsis
* gentabs();
*/
void gentabs()
{
int i, j, k, *accset, nacc, *acc_array, total_states;
int end_of_buffer_action = num_rules + 1;
/* *everything* is done in terms of arrays starting at 1, so provide
* a null entry for the zero element of all C arrays
*/
static char C_char_decl[] =
"static const YY_CHAR %s[%d] =\n { 0,\n";
acc_array = allocate_integer_array( current_max_dfas );
nummt = 0;
/* the compressed table format jams by entering the "jam state",
* losing information about the previous state in the process.
* In order to recover the previous state, we effectively need
* to keep backtracking information.
*/
++num_backtracking;
if ( reject )
{
/* write out accepting list and pointer list
*
* first we generate the "yy_acclist" array. In the process, we compute
* the indices that will go into the "yy_accept" array, and save the
* indices in the dfaacc array
*/
int EOB_accepting_list[2];
/* set up accepting structures for the End Of Buffer state */
EOB_accepting_list[0] = 0;
EOB_accepting_list[1] = end_of_buffer_action;
accsiz[end_of_buffer_state] = 1;
dfaacc[end_of_buffer_state].dfaacc_set = EOB_accepting_list;
printf( C_short_decl, "yy_acclist", max( numas, 1 ) + 1 );
j = 1; /* index into "yy_acclist" array */
for ( i = 1; i <= lastdfa; ++i )
{
acc_array[i] = j;
if ( accsiz[i] != 0 )
{
accset = dfaacc[i].dfaacc_set;
nacc = accsiz[i];
if ( trace )
fprintf( stderr, "state # %d accepts: ", i );
for ( k = 1; k <= nacc; ++k )
{
int accnum = accset[k];
++j;
if ( variable_trailing_context_rules &&
! (accnum & YY_TRAILING_HEAD_MASK) &&
accnum > 0 &&
rule_type[accnum] == RULE_VARIABLE )
{
/* special hack to flag accepting number as part
* of trailing context rule
*/
accnum |= YY_TRAILING_MASK;
}
mkdata( accnum );
if ( trace )
{
fprintf( stderr, "[%d]", accset[k] );
if ( k < nacc )
fputs( ", ", stderr );
else
putc( '\n', stderr );
}
}
}
}
/* add accepting number for the "jam" state */
acc_array[i] = j;
dataend();
}
else
{
dfaacc[end_of_buffer_state].dfaacc_state = end_of_buffer_action;
for ( i = 1; i <= lastdfa; ++i )
acc_array[i] = dfaacc[i].dfaacc_state;
/* add accepting number for jam state */
acc_array[i] = 0;
}
/* spit out "yy_accept" array. If we're doing "reject", it'll be pointers
* into the "yy_acclist" array. Otherwise it's actual accepting numbers.
* In either case, we just dump the numbers.
*/
/* "lastdfa + 2" is the size of "yy_accept"; includes room for C arrays
* beginning at 0 and for "jam" state
*/
k = lastdfa + 2;
if ( reject )
/* we put a "cap" on the table associating lists of accepting
* numbers with state numbers. This is needed because we tell
* where the end of an accepting list is by looking at where
* the list for the next state starts.
*/
++k;
printf( C_short_decl, "yy_accept", k );
for ( i = 1; i <= lastdfa; ++i )
{
mkdata( acc_array[i] );
if ( ! reject && trace && acc_array[i] )
fprintf( stderr, "state # %d accepts: [%d]\n", i, acc_array[i] );
}
/* add entry for "jam" state */
mkdata( acc_array[i] );
if ( reject )
/* add "cap" for the list */
mkdata( acc_array[i] );
dataend();
if ( useecs )
genecs();
if ( usemecs )
{
/* write out meta-equivalence classes (used to index templates with) */
if ( trace )
fputs( "\n\nMeta-Equivalence Classes:\n", stderr );
printf( C_char_decl, "yy_meta", numecs + 1 );
for ( i = 1; i <= numecs; ++i )
{
if ( trace )
fprintf( stderr, "%d = %d\n", i, abs( tecbck[i] ) );
mkdata( abs( tecbck[i] ) );
}
dataend();
}
total_states = lastdfa + numtemps;
printf( tblend > MAX_SHORT ? C_long_decl : C_short_decl,
"yy_base", total_states + 1 );
for ( i = 1; i <= lastdfa; ++i )
{
register int d = def[i];
if ( base[i] == JAMSTATE )
base[i] = jambase;
if ( d == JAMSTATE )
def[i] = jamstate;
else if ( d < 0 )
{
/* template reference */
++tmpuses;
def[i] = lastdfa - d + 1;
}
mkdata( base[i] );
}
/* generate jam state's base index */
mkdata( base[i] );
for ( ++i /* skip jam state */; i <= total_states; ++i )
{
mkdata( base[i] );
def[i] = jamstate;
}
dataend();
printf( tblend > MAX_SHORT ? C_long_decl : C_short_decl,
"yy_def", total_states + 1 );
for ( i = 1; i <= total_states; ++i )
mkdata( def[i] );
dataend();
printf( lastdfa > MAX_SHORT ? C_long_decl : C_short_decl,
"yy_nxt", tblend + 1 );
for ( i = 1; i <= tblend; ++i )
{
if ( nxt[i] == 0 || chk[i] == 0 )
nxt[i] = jamstate; /* new state is the JAM state */
mkdata( nxt[i] );
}
dataend();
printf( lastdfa > MAX_SHORT ? C_long_decl : C_short_decl,
"yy_chk", tblend + 1 );
for ( i = 1; i <= tblend; ++i )
{
if ( chk[i] == 0 )
++nummt;
mkdata( chk[i] );
}
dataend();
}
/* write out a formatted string (with a secondary string argument) at the
* current indentation level, adding a final newline
*/
void indent_put2s( fmt, arg )
char fmt[], arg[];
{
do_indent();
printf( fmt, arg );
putchar( '\n' );
}
/* write out a string at the current indentation level, adding a final
* newline
*/
void indent_puts( str )
char str[];
{
do_indent();
puts( str );
}
/* make_tables - generate transition tables
*
* synopsis
* make_tables();
*
* Generates transition tables and finishes generating output file
*/
void make_tables()
{
register int i;
int did_eof_rule = false;
skelout();
/* first, take care of YY_DO_BEFORE_ACTION depending on yymore being used */
set_indent( 2 );
if ( yymore_used )
{
indent_puts( "yytext -= yy_more_len; \\" );
indent_puts( "yyleng = yy_cp - yytext; \\" );
}
else
indent_puts( "yyleng = yy_cp - yy_bp; \\" );
set_indent( 0 );
skelout();
printf( "#define YY_END_OF_BUFFER %d\n", num_rules + 1 );
if ( fullspd )
{ /* need to define the transet type as a size large
* enough to hold the biggest offset
*/
int total_table_size = tblend + numecs + 1;
char *trans_offset_type =
total_table_size > MAX_SHORT ? "long" : "short";
set_indent( 0 );
indent_puts( "struct yy_trans_info" );
indent_up();
indent_puts( "{" );
indent_puts( "short yy_verify;" );
/* in cases where its sister yy_verify *is* a "yes, there is a
* transition", yy_nxt is the offset (in records) to the next state.
* In most cases where there is no transition, the value of yy_nxt
* is irrelevant. If yy_nxt is the -1th record of a state, though,
* then yy_nxt is the action number for that state
*/
indent_put2s( "%s yy_nxt;", trans_offset_type );
indent_puts( "};" );
indent_down();
indent_puts( "typedef const struct yy_trans_info *yy_state_type;" );
}
else
indent_puts( "typedef int yy_state_type;" );
if ( fullspd )
genctbl();
else if ( fulltbl )
genftbl();
else
gentabs();
if ( num_backtracking > 0 )
{
indent_puts( "static yy_state_type yy_last_accepting_state;" );
indent_puts( "static YY_CHAR *yy_last_accepting_cpos;\n" );
}
if ( nultrans )
{
printf( C_state_decl, "yy_NUL_trans", lastdfa + 1 );
for ( i = 1; i <= lastdfa; ++i )
{
if ( fullspd )
{
if ( nultrans )
printf( " &yy_transition[%d],\n", base[i] );
else
printf( " 0,\n" );
}
else
mkdata( nultrans[i] );
}
dataend();
}
if ( ddebug )
{ /* spit out table mapping rules to line numbers */
indent_puts( "extern int yy_flex_debug;" );
indent_puts( "int yy_flex_debug = 1;\n" );
printf( C_short_decl, "yy_rule_linenum", num_rules );
for ( i = 1; i < num_rules; ++i )
mkdata( rule_linenum[i] );
dataend();
}
if ( reject )
{
/* declare state buffer variables */
puts(
"static yy_state_type yy_state_buf[YY_BUF_SIZE + 2], *yy_state_ptr;" );
puts( "static YY_CHAR *yy_full_match;" );
puts( "static int yy_lp;" );
if ( variable_trailing_context_rules )
{
puts( "static int yy_looking_for_trail_begin = 0;" );
puts( "static int yy_full_lp;" );
puts( "static int *yy_full_state;" );
printf( "#define YY_TRAILING_MASK 0x%x\n", YY_TRAILING_MASK );
printf( "#define YY_TRAILING_HEAD_MASK 0x%x\n",
YY_TRAILING_HEAD_MASK );
}
puts( "#define REJECT \\" );
puts( "{ \\" );
puts(
"*yy_cp = yy_hold_char; /* undo effects of setting up yytext */ \\" );
puts(
"yy_cp = yy_full_match; /* restore poss. backed-over text */ \\" );
if ( variable_trailing_context_rules )
{
puts( "yy_lp = yy_full_lp; /* restore orig. accepting pos. */ \\" );
puts(
"yy_state_ptr = yy_full_state; /* restore orig. state */ \\" );
puts(
"yy_current_state = *yy_state_ptr; /* restore curr. state */ \\" );
}
puts( "++yy_lp; \\" );
puts( "goto find_rule; \\" );
puts( "}" );
}
else
{
puts( "/* the intent behind this definition is that it'll catch" );
puts( " * any uses of REJECT which flex missed" );
puts( " */" );
puts( "#define REJECT reject_used_but_not_detected" );
}
if ( yymore_used )
{
indent_puts( "static int yy_more_flag = 0;" );
indent_puts( "static int yy_doing_yy_more = 0;" );
indent_puts( "static int yy_more_len = 0;" );
indent_puts(
"#define yymore() { yy_more_flag = 1; }" );
indent_puts(
"#define YY_MORE_ADJ (yy_doing_yy_more ? yy_more_len : 0)" );
}
else
{
indent_puts( "#define yymore() yymore_used_but_not_detected" );
indent_puts( "#define YY_MORE_ADJ 0" );
}
skelout();
if ( ferror( temp_action_file ) )
flexfatal( "error occurred when writing temporary action file" );
else if ( fclose( temp_action_file ) )
flexfatal( "error occurred when closing temporary action file" );
temp_action_file = fopen( action_file_name, "r" );
if ( temp_action_file == NULL )
flexfatal( "could not re-open temporary action file" );
/* copy prolog from action_file to output file */
action_out();
skelout();
set_indent( 2 );
if ( yymore_used )
{
indent_puts( "yy_more_len = 0;" );
indent_puts( "yy_doing_yy_more = yy_more_flag;" );
indent_puts( "if ( yy_doing_yy_more )" );
indent_up();
indent_puts( "{" );
indent_puts( "yy_more_len = yyleng;" );
indent_puts( "yy_more_flag = 0;" );
indent_puts( "}" );
indent_down();
}
skelout();
gen_start_state();
/* note, don't use any indentation */
puts( "yy_match:" );
gen_next_match();
skelout();
set_indent( 2 );
gen_find_action();
skelout();
if ( ddebug )
{
indent_puts( "if ( yy_flex_debug )" );
indent_up();
indent_puts( "{" );
indent_puts( "if ( yy_act == 0 )" );
indent_up();
indent_puts( "fprintf( stderr, \"--scanner backtracking\\n\" );" );
indent_down();
do_indent();
printf( "else if ( yy_act < %d )\n", num_rules );
indent_up();
indent_puts(
"fprintf( stderr, \"--accepting rule at line %d (\\\"%s\\\")\\n\"," );
indent_puts( " yy_rule_linenum[yy_act], yytext );" );
indent_down();
do_indent();
printf( "else if ( yy_act == %d )\n", num_rules );
indent_up();
indent_puts(
"fprintf( stderr, \"--accepting default rule (\\\"%s\\\")\\n\"," );
indent_puts( " yytext );" );
indent_down();
do_indent();
printf( "else if ( yy_act == %d )\n", num_rules + 1 );
indent_up();
indent_puts( "fprintf( stderr, \"--(end of buffer or a NUL)\\n\" );" );
indent_down();
do_indent();
printf( "else\n" );
indent_up();
indent_puts( "fprintf( stderr, \"--EOF\\n\" );" );
indent_down();
indent_puts( "}" );
indent_down();
}
/* copy actions from action_file to output file */
skelout();
indent_up();
gen_bt_action();
action_out();
/* generate cases for any missing EOF rules */
for ( i = 1; i <= lastsc; ++i )
if ( ! sceof[i] )
{
do_indent();
printf( "case YY_STATE_EOF(%s):\n", scname[i] );
did_eof_rule = true;
}
if ( did_eof_rule )
{
indent_up();
indent_puts( "yyterminate();" );
indent_down();
}
/* generate code for handling NUL's, if needed */
/* first, deal with backtracking and setting up yy_cp if the scanner
* finds that it should JAM on the NUL
*/
skelout();
set_indent( 7 );
if ( fullspd || fulltbl )
indent_puts( "yy_cp = yy_c_buf_p;" );
else
{ /* compressed table */
if ( ! reject && ! interactive )
{
/* do the guaranteed-needed backtrack to figure out the match */
indent_puts( "yy_cp = yy_last_accepting_cpos;" );
indent_puts( "yy_current_state = yy_last_accepting_state;" );
}
}
/* generate code for yy_get_previous_state() */
set_indent( 1 );
skelout();
if ( bol_needed )
indent_puts( "register YY_CHAR *yy_bp = yytext;\n" );
gen_start_state();
set_indent( 2 );
skelout();
gen_next_state( true );
set_indent( 1 );
skelout();
gen_NUL_trans();
skelout();
/* copy remainder of input to output */
line_directive_out( stdout );
(void) flexscan(); /* copy remainder of input to output */
}
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