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expressions.c
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expressions.c
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/*********************************************************************
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*********************************************************************/
/***********************************************************************
* File: expressions.c
* Description: functions for handling numerical expressions
*
* - general utilities:
* comparisons between numbers etc.
*
* - LNF compilation:
* normalization of expressions
* translation of subtractions
*
* - LNF post-processing:
* summarization of effects
* encoding of non-minimal LNFs
*
* Author: Joerg Hoffmann 2001
*
*********************************************************************/
#include "ff.h"
#include "output.h"
#include "memory.h"
#include "expressions.h"
/*******************************************************
* SIMPLE UTILITIES
*******************************************************/
Bool number_comparison_holds( Comparator c, float l, float r )
{
switch ( c ) {
case LE:
if ( l < r ) return TRUE;
break;
case LEQ:
if ( l <= r ) return TRUE;
break;
case EQ:
if ( l == r ) return TRUE;
break;
case GEQ:
if ( l >= r ) return TRUE;
break;
case GE:
if ( l > r ) return TRUE;
break;
case IGUAL:
/* technical for non-required fluents
*/
return TRUE;
default:
printf("\n\nillegal comparator %d in number comp holds", c);
exit( 1 );
}
return FALSE;
}
/*******************************************************
* MACHINERY FOR LNF TRANSFORMATION!!!!!!
*******************************************************/
Bool transform_to_LNF( void )
{
if ( !is_linear_task() ) {
return FALSE;
}
normalize_expressions();
if ( gcmd_line.display_info == 121 ) {
printf("\n\nnormalized expressions representation is:\n\n");
print_lnf_representation();
}
translate_subtractions();
if ( gcmd_line.display_info == 122 ) {
printf("\n\nLNF : translated subtractions representation is:\n\n");
print_lnf_representation();
}
/* LNF computed. start post-processing.
*/
/* do same-cond effects etc. summarization here so as to have
* as tight as possible an encoded LNF representation.
*/
summarize_effects();
if ( gcmd_line.display_info == 123 ) {
printf("\n\nLNF - summarized effects representation is:\n\n");
print_lnf_representation();
}
encode_lfns_as_artificial_fluents();
/* optimization is translated into minimizing
* effect costs... here, determine the cost that
* each effect has.
*
* returns TRUE if a non-trivial optimization expression
* could be established.
*/
if ( setup_effect_costs() ) {
if ( gcmd_line.display_info > 1 ) {
printf("\nmetric established (normalized to minimize): ");
print_LnfExpNode( &glnf_metric );
}
goptimization_established = TRUE;
}
if ( gcmd_line.display_info == 124 ) {
printf("\n\nencoded LNF representation is:\n\n");
print_lnf_representation();
}
return TRUE;
}
/* simple syntax check
*/
Bool is_linear_task( void )
{
Action *a;
ActionEffect *e;
int i, j;
for ( a = gactions; a; a = a->next ) {
/* preconds
*/
for ( i = 0; i < a->num_numeric_preconds; i++ ) {
if ( !is_linear_expression( a->numeric_preconds_lh[i] ) ) {
return FALSE;
}
if ( !is_linear_expression( a->numeric_preconds_rh[i] ) ) {
return FALSE;
}
}
/* effects
*/
for ( i = 0; i < a->num_effects; i++ ) {
e = &(a->effects[i]);
for ( j = 0; j < e->num_numeric_conditions; j++ ) {
if ( !is_linear_expression( e->numeric_conditions_lh[j] ) ) {
return FALSE;
}
if ( !is_linear_expression( e->numeric_conditions_rh[j] ) ) {
return FALSE;
}
}
if ( e->illegal ) {
/* we don't care whether that one's ok or not-
* it won't be applied anyway.
*/
continue;
}
for ( j = 0; j < e->num_numeric_effects; j++ ) {
if ( e->numeric_effects_neft[j] != INCREASE &&
e->numeric_effects_neft[j] != DECREASE &&
e->numeric_effects_neft[j] != ASSIGN ) {
return FALSE;
}
if ( !is_linear_expression( e->numeric_effects_rh[j] ) ) {
return FALSE;
}
}
}
}
/* goal condition also...
*/
for ( i = 0; i < gnum_numeric_goal; i++ ) {
if ( !is_linear_expression( gnumeric_goal_lh[i] ) ) {
return FALSE;
}
if ( !is_linear_expression( gnumeric_goal_rh[i] ) ) {
return FALSE;
}
}
if ( gmetric != NULL ) {
if ( !is_linear_expression( gmetric ) ) {
if ( gcmd_line.display_info ) {
printf("\nwarning: metric is no linear expression. defaulting to plan length.");
}
free_ExpNode( gmetric );
gmetric = NULL;
}
}
return TRUE;
}
Bool is_linear_expression( ExpNode *n )
{
switch ( n->connective ) {
case MU:
if ( !is_linear_expression( n->leftson ) ||
!is_linear_expression( n->rightson ) ) {
return FALSE;
}
if ( n->leftson->connective != NUMBER &&
n->rightson->connective != NUMBER ) {
return FALSE;
}
break;
case DI:
if ( !is_linear_expression( n->leftson ) ||
n->rightson->connective != NUMBER ) {
return FALSE;
}
break;
case AD:
case SU:
if ( !is_linear_expression( n->leftson ) ||
!is_linear_expression( n->rightson ) ) {
return FALSE;
}
break;
case MINUS:
if ( !is_linear_expression( n->son ) ) {
return FALSE;
}
break;
case NUMBER:
case FHEAD:
break;
default:
printf("\n\nis linear exp: wrong specifier %d",
n->connective);
exit( 1 );
}
return TRUE;
}
void print_lnf_representation( void )
{
int i;
Action *a;
for ( i = 0; i < gnum_operators; i++ ) {
printf("\n\n------------------operator %s-----------\n\n", goperators[i]->name);
for ( a = gactions; a; a = a->next ) {
if ( ( !a->norm_operator &&
!a->pseudo_action ) ||
( a->norm_operator &&
a->norm_operator->operator != goperators[i] ) ||
( a->pseudo_action &&
a->pseudo_action->operator != goperators[i] ) ) {
continue;
}
print_lnf_Action( a );
}
}
printf("\n\n--------------------GOAL REACHED ops-----------\n\n");
for ( a = gactions; a; a = a->next ) {
if ( !a->norm_operator &&
!a->pseudo_action ) {
print_lnf_Action( a );
}
}
printf("\n\ninitial state is:\n\n");
print_State( ginitial_state );
printf("\n\ngoal is:\n\n");
for ( i = 0; i < gnum_logic_goal; i++ ) {
print_ft_name( glogic_goal[i] );
printf("\n");
}
for ( i = 0; i < gnum_lnf_goal; i++ ) {
switch ( glnf_goal_comp[i] ) {
case GEQ:
printf("(>= ");
break;
case GE:
printf("(> ");
break;
default:
printf("\nwrong comparator in lnf goal %d\n\n", glnf_goal_comp[i]);
exit( 1 );
}
print_LnfExpNode( glnf_goal_lh[i] );
printf(" %f", glnf_goal_rh[i]);
printf(")\n");
}
if ( gmetric ) {
printf("\n\nmetric is (minimize) (constant part skipped):\n");
print_LnfExpNode( &glnf_metric );
} else {
printf("\n\nmetric: none, i.e. plan length\n");
}
}
/*******************************************************
* SUBPART I: NORMALIZE THE EXPRESSIONS
*******************************************************/
/* local globals.
*/
Comparator lcomp;
int lF[MAX_LNF_F];
float lC[MAX_LNF_F];
int lnum_F;
float lc;
void normalize_expressions( void )
{
Action *a, *p, *t;
ActionEffect *e;
int i, j, k;
Bool eq;
LnfExpNode *lnf;
/* first, pre-normalize all the expressions, i.e. translate
* divisions, and push muliplications downwards.
*/
for ( i = 0; i < gnum_numeric_goal; i++ ) {
if ( !translate_divisions( &(gnumeric_goal_lh[i]) ) ) {
printf("\n\nff: division by zero in goal. no plan will solve it.\n\n");
exit( 1 );
}
push_multiplications_down( &(gnumeric_goal_lh[i]) );
if ( !translate_divisions( &(gnumeric_goal_rh[i]) ) ) {
printf("\n\nff: division by zero in goal. no plan will solve it.\n\n");
exit( 1 );
}
push_multiplications_down( &(gnumeric_goal_rh[i]) );
}
a = gactions; p = NULL;
while ( a ) {
for ( i = 0; i < a->num_numeric_preconds; i++ ) {
if ( !translate_divisions( &(a->numeric_preconds_lh[i]) ) ) break;
push_multiplications_down( &(a->numeric_preconds_lh[i]) );
if ( !translate_divisions( &(a->numeric_preconds_rh[i]) ) ) break;
push_multiplications_down( &(a->numeric_preconds_rh[i]) );
}
if ( i < a->num_numeric_preconds ) {
if ( gcmd_line.display_info ) {
printf("\nwarning: division by zero in precond of ");
print_Action_name( a );
printf(". skipping action.");
}
gnum_actions--;
if ( p ) {
p->next = a->next;
t = a;
a = a->next;
t->next = gtrash_actions;
gtrash_actions = t;
} else {
gactions = a->next;
t = a;
a = a->next;
t->next = gtrash_actions;
gtrash_actions = t;
}
continue;
}
for ( i = 0; i < a->num_effects; i++ ) {
e = &(a->effects[i]);
for ( j = 0; j < e->num_numeric_conditions; j++ ) {
if ( !translate_divisions( &(e->numeric_conditions_lh[j]) ) ) break;
push_multiplications_down( &(e->numeric_conditions_lh[j]) );
if ( !translate_divisions( &(e->numeric_conditions_rh[j]) ) ) break;
push_multiplications_down( &(e->numeric_conditions_rh[j]) );
}
if ( j < e->num_numeric_conditions ) break;
if ( e->illegal ) {
continue;
}
for ( j = 0; j < e->num_numeric_effects; j++ ) {
if ( !translate_divisions( &(e->numeric_effects_rh[j]) ) ) break;
push_multiplications_down( &(e->numeric_effects_rh[j]) );
}
if ( j < e->num_numeric_effects ) {
if ( gcmd_line.display_info ) {
printf("\nwarning: division by zero in effect rh of ");
print_Action_name( a );
printf(". marking effect as illegal.");
}
e->illegal = TRUE;
}
}
if ( i < a->num_effects ) {
if ( gcmd_line.display_info ) {
printf("\nwarning: division by zero in effect cond of ");
print_Action_name( a );
printf(". skipping action.");
}
gnum_actions--;
if ( p ) {
p->next = a->next;
t = a;
a = a->next;
t->next = gtrash_actions;
gtrash_actions = t;
} else {
gactions = a->next;
t = a;
a = a->next;
t->next = gtrash_actions;
gtrash_actions = t;
}
continue;
}
p = a;
a = a->next;
}
if ( gmetric != NULL ) {
if ( !translate_divisions( &gmetric ) ) {
if ( gcmd_line.display_info ) {
printf("\nwarning: division by zero in metric. replaced with plan length.");
}
free_ExpNode( gmetric );
gmetric = NULL;
}
push_multiplications_down( &gmetric );
}
/* now, collect the normalized representations of all expressions.
*/
for ( a = gactions; a; a = a->next ) {
/* preconds
*/
a->lnf_preconds_comp = ( Comparator * ) calloc( MAX_LNF_COMPS, sizeof( Comparator ) );
a->lnf_preconds_lh = ( LnfExpNode_pointer * ) calloc( MAX_LNF_COMPS, sizeof( LnfExpNode_pointer ) );
a->lnf_preconds_rh = ( float * ) calloc( MAX_LNF_COMPS, sizeof( float ) );
a->num_lnf_preconds = 0;
for ( i = 0; i < a->num_numeric_preconds; i++ ) {
if ( a->num_lnf_preconds == MAX_LNF_COMPS ) {
printf("\n\nincrease MAX_LNF_COMPS! currently %d\n\n", MAX_LNF_COMPS);
exit( 1 );
}
eq = FALSE;
if ( a->numeric_preconds_comp[i] == EQ ) {
eq = TRUE;
a->numeric_preconds_comp[i] = LEQ;
}
put_comp_into_normalized_locals( a->numeric_preconds_comp[i],
a->numeric_preconds_lh[i],
a->numeric_preconds_rh[i] );
a->lnf_preconds_comp[a->num_lnf_preconds] = lcomp;
a->lnf_preconds_lh[a->num_lnf_preconds] = new_LnfExpNode();
lnf = a->lnf_preconds_lh[a->num_lnf_preconds];
for ( j = 0; j < lnum_F; j++ ) {
if ( lC[j] == 0 ) continue;
if ( lC[j] > 0 ) {
lnf->pF[lnf->num_pF] = lF[j];
lnf->pC[lnf->num_pF++] = lC[j];
} else {
lnf->nF[lnf->num_nF] = lF[j];
lnf->nC[lnf->num_nF++] = (-1) * lC[j];
}
}
a->lnf_preconds_rh[a->num_lnf_preconds] = lc;
a->num_lnf_preconds++;
if ( eq ) {
if ( a->num_lnf_preconds == MAX_LNF_COMPS ) {
printf("\n\nincrease MAX_LNF_COMPS! currently %d\n\n", MAX_LNF_COMPS);
exit( 1 );
}
a->numeric_preconds_comp[i] = EQ;
put_comp_into_normalized_locals( GEQ,
a->numeric_preconds_lh[i],
a->numeric_preconds_rh[i] );
a->lnf_preconds_comp[a->num_lnf_preconds] = lcomp;
a->lnf_preconds_lh[a->num_lnf_preconds] = new_LnfExpNode();
lnf = a->lnf_preconds_lh[a->num_lnf_preconds];
for ( j = 0; j < lnum_F; j++ ) {
if ( lC[j] == 0 ) continue;
if ( lC[j] > 0 ) {
lnf->pF[lnf->num_pF] = lF[j];
lnf->pC[lnf->num_pF++] = lC[j];
} else {
lnf->nF[lnf->num_nF] = lF[j];
lnf->nC[lnf->num_nF++] = (-1) * lC[j];
}
}
a->lnf_preconds_rh[a->num_lnf_preconds] = lc;
a->num_lnf_preconds++;
}
}
/* effects
*/
for ( i = 0; i < a->num_effects; i++ ) {
e = &(a->effects[i]);
e->lnf_conditions_comp = ( Comparator * ) calloc( MAX_LNF_COMPS, sizeof( Comparator ) );
e->lnf_conditions_lh = ( LnfExpNode_pointer * ) calloc( MAX_LNF_COMPS, sizeof( LnfExpNode_pointer ) );
e->lnf_conditions_rh = ( float * ) calloc( MAX_LNF_COMPS, sizeof( float ) );
e->num_lnf_conditions = 0;
for ( j = 0; j < e->num_numeric_conditions; j++ ) {
if ( e->num_lnf_conditions == MAX_LNF_COMPS ) {
printf("\n\nincrease MAX_LNF_COMPS! currently %d\n\n", MAX_LNF_COMPS);
exit( 1 );
}
eq = FALSE;
if ( e->numeric_conditions_comp[j] == EQ ) {
eq = TRUE;
e->numeric_conditions_comp[j] = LEQ;
}
put_comp_into_normalized_locals( e->numeric_conditions_comp[j],
e->numeric_conditions_lh[j],
e->numeric_conditions_rh[j] );
e->lnf_conditions_comp[e->num_lnf_conditions] = lcomp;
e->lnf_conditions_lh[e->num_lnf_conditions] = new_LnfExpNode();
lnf = e->lnf_conditions_lh[e->num_lnf_conditions];
for ( k = 0; k < lnum_F; k++ ) {
if ( lC[k] == 0 ) continue;
if ( lC[k] > 0 ) {
lnf->pF[lnf->num_pF] = lF[k];
lnf->pC[lnf->num_pF++] = lC[k];
} else {
lnf->nF[lnf->num_nF] = lF[k];
lnf->nC[lnf->num_nF++] = (-1) * lC[k];
}
}
e->lnf_conditions_rh[e->num_lnf_conditions] = lc;
e->num_lnf_conditions++;
if ( eq ) {
if ( e->num_lnf_conditions == MAX_LNF_COMPS ) {
printf("\n\nincrease MAX_LNF_COMPS! currently %d\n\n", MAX_LNF_COMPS);
exit( 1 );
}
e->numeric_conditions_comp[j] = EQ;
put_comp_into_normalized_locals( GEQ,
e->numeric_conditions_lh[j],
e->numeric_conditions_rh[j] );
e->lnf_conditions_comp[e->num_lnf_conditions] = lcomp;
e->lnf_conditions_lh[e->num_lnf_conditions] = new_LnfExpNode();
lnf = e->lnf_conditions_lh[e->num_lnf_conditions];
for ( k = 0; k < lnum_F; k++ ) {
if ( lC[k] == 0 ) continue;
if ( lC[k] > 0 ) {
lnf->pF[lnf->num_pF] = lF[k];
lnf->pC[lnf->num_pF++] = lC[k];
} else {
lnf->nF[lnf->num_nF] = lF[k];
lnf->nC[lnf->num_nF++] = (-1) * lC[k];
}
}
e->lnf_conditions_rh[e->num_lnf_conditions] = lc;
e->num_lnf_conditions++;
}
}
if ( e->illegal ) {
/* we do have the LNF to know whether the effect appears.
* if it does, then this one is illegal anyway, remembered
* in inst final due to undefined fl access.
*
* if it is LEGAL, then all fluents we're gonna find and
* collect below are relevant!!!
*/
continue;
}
e->lnf_effects_neft = ( NumericEffectType * ) calloc( MAX_LNF_EFFS, sizeof( NumericEffectType ) );
e->lnf_effects_fl = ( int * ) calloc( MAX_LNF_EFFS, sizeof( int ) );
e->lnf_effects_rh = ( LnfExpNode_pointer * ) calloc( MAX_LNF_EFFS, sizeof( LnfExpNode_pointer ) );
e->num_lnf_effects = 0;
for ( j = 0; j < e->num_numeric_effects; j++ ) {
if ( e->num_lnf_effects == MAX_LNF_EFFS ) {
printf("\n\nincrease MAX_LNF_EFFS! currently %d\n\n", MAX_LNF_EFFS);
exit( 1 );
}
e->lnf_effects_neft[e->num_lnf_effects] = e->numeric_effects_neft[j];
e->lnf_effects_fl[e->num_lnf_effects] = e->numeric_effects_fl[j];
lnum_F = 0;
lc = 0;
if ( e->lnf_effects_neft[e->num_lnf_effects] == DECREASE ) {
collect_normalized_locals( e->numeric_effects_rh[j], FALSE );
e->lnf_effects_neft[e->num_lnf_effects] = INCREASE;
} else {
collect_normalized_locals( e->numeric_effects_rh[j], TRUE );
}
e->lnf_effects_rh[e->num_lnf_effects] = new_LnfExpNode();
lnf = e->lnf_effects_rh[e->num_lnf_effects];
for ( k = 0; k < lnum_F; k++ ) {
if ( lC[k] == 0 ) continue;
if ( lC[k] > 0 ) {
lnf->pF[lnf->num_pF] = lF[k];
lnf->pC[lnf->num_pF++] = lC[k];
} else {
lnf->nF[lnf->num_nF] = lF[k];
lnf->nC[lnf->num_nF++] = (-1) * lC[k];
}
}
e->lnf_effects_rh[e->num_lnf_effects]->c = lc;
e->num_lnf_effects++;
}
}
}
/* goal condition also...
*/
glnf_goal_comp = ( Comparator * ) calloc( MAX_LNF_COMPS, sizeof( Comparator ) );
glnf_goal_lh = ( LnfExpNode_pointer * ) calloc( MAX_LNF_COMPS, sizeof( LnfExpNode_pointer ) );
glnf_goal_rh = ( float * ) calloc( MAX_LNF_COMPS, sizeof( float ) );
gnum_lnf_goal = 0;
for ( i = 0; i < gnum_numeric_goal; i++ ) {
if ( gnum_lnf_goal == MAX_LNF_COMPS ) {
printf("\n\nincrease MAX_LNF_COMPS! currently %d\n\n", MAX_LNF_COMPS);
exit( 1 );
}
eq = FALSE;
if ( gnumeric_goal_comp[i] == EQ ) {
eq = TRUE;
gnumeric_goal_comp[i] = LEQ;
}
put_comp_into_normalized_locals( gnumeric_goal_comp[i],
gnumeric_goal_lh[i],
gnumeric_goal_rh[i] );
glnf_goal_comp[gnum_lnf_goal] = lcomp;
glnf_goal_lh[gnum_lnf_goal] = new_LnfExpNode();
lnf = glnf_goal_lh[gnum_lnf_goal];
for ( j = 0; j < lnum_F; j++ ) {
if ( lC[j] == 0 ) continue;
if ( lC[j] > 0 ) {
lnf->pF[lnf->num_pF] = lF[j];
lnf->pC[lnf->num_pF++] = lC[j];
} else {
lnf->nF[lnf->num_nF] = lF[j];
lnf->nC[lnf->num_nF++] = (-1) * lC[j];
}
}
glnf_goal_rh[gnum_lnf_goal] = lc;
gnum_lnf_goal++;
if ( eq ) {
if ( gnum_lnf_goal == MAX_LNF_COMPS ) {
printf("\n\nincrease MAX_LNF_COMPS! currently %d\n\n", MAX_LNF_COMPS);
exit( 1 );
}
gnumeric_goal_comp[i] = EQ;
put_comp_into_normalized_locals( GEQ,
gnumeric_goal_lh[i],
gnumeric_goal_rh[i] );
glnf_goal_comp[gnum_lnf_goal] = lcomp;
glnf_goal_lh[gnum_lnf_goal] = new_LnfExpNode();
lnf = glnf_goal_lh[gnum_lnf_goal];
for ( j = 0; j < lnum_F; j++ ) {
if ( lC[j] == 0 ) continue;
if ( lC[j] > 0 ) {
lnf->pF[lnf->num_pF] = lF[j];
lnf->pC[lnf->num_pF++] = lC[j];
} else {
lnf->nF[lnf->num_nF] = lF[j];
lnf->nC[lnf->num_nF++] = (-1) * lC[j];
}
}
glnf_goal_rh[gnum_lnf_goal] = lc;
gnum_lnf_goal++;
}
}
/* metric...
*/
lnum_F = 0;
lc = 0;
glnf_metric.num_pF = 0;
glnf_metric.num_nF = 0;
glnf_metric.c = 0;
collect_normalized_locals( gmetric, TRUE );
lnf = &glnf_metric;
for ( j = 0; j < lnum_F; j++ ) {
if ( lC[j] == 0 ) continue;
if ( lC[j] > 0 ) {
lnf->pF[lnf->num_pF] = lF[j];
lnf->pC[lnf->num_pF++] = lC[j];
} else {
lnf->nF[lnf->num_nF] = lF[j];
lnf->nC[lnf->num_nF++] = (-1) * lC[j];
}
}
}
Bool translate_divisions( ExpNode **n )
{
ExpNode *tmp;
/* "dirty": also normalize multiplications so that the constant
* is always on the left hand side ---
* simplifies function below a lot.
*/
switch ( (*n)->connective ) {
case DI:
/* rightson is number due to syntax check.
*/
if ( (*n)->rightson->value == 0 ) {
/* what needs to be done we can only decide further up.
*/
printf("\nwarning: division by zero.");
return FALSE;
}
if ( !translate_divisions( &((*n)->leftson) ) ) return FALSE;
(*n)->connective = MU;
(*n)->rightson->value = 1 / (*n)->rightson->value;
tmp = (*n)->rightson;
(*n)->rightson = (*n)->leftson;
(*n)->leftson = tmp;
break;
case MU:
if ( !translate_divisions( &((*n)->leftson) ) ) return FALSE;
if ( !translate_divisions( &((*n)->rightson) ) ) return FALSE;
if ( (*n)->rightson->connective == NUMBER ) {
tmp = (*n)->rightson;
(*n)->rightson = (*n)->leftson;
(*n)->leftson = tmp;
}
break;
case AD:
case SU:
if ( !translate_divisions( &((*n)->leftson) ) ) return FALSE;
if ( !translate_divisions( &((*n)->rightson) ) ) return FALSE;
break;
case MINUS:
if ( !translate_divisions( &((*n)->son) ) ) return FALSE;
break;
case NUMBER:
case FHEAD:
break;
default:
printf("\n\ntranslate divisions: wrong specifier %d",
(*n)->connective);
exit( 1 );
}
return TRUE;
}
void push_multiplications_down( ExpNode **n )
{
ExpNode *tmp1, *tmp2;
switch ( (*n)->connective ) {
case MU:
/* due to syntax check, at least one of sons is number,
*
* due to above, it's the left one.
* NOTE that this invariant is kept true troughout the
* modifications done here.
*/
if ( (*n)->rightson->connective == NUMBER ) {
(*n)->connective = NUMBER;
(*n)->value = (*n)->leftson->value * (*n)->rightson->value;
free_ExpNode( (*n)->leftson );
free_ExpNode( (*n)->rightson );
(*n)->leftson = NULL;
(*n)->rightson = NULL;
break;
}
if ( (*n)->rightson->connective == FHEAD ) {
(*n)->connective = FHEAD;
(*n)->fl = (*n)->rightson->fl;
(*n)->c = (*n)->leftson->value;
free_ExpNode( (*n)->leftson );
free_ExpNode( (*n)->rightson );
(*n)->leftson = NULL;
(*n)->rightson = NULL;
break;
}
if ( (*n)->rightson->connective == MINUS ) {
(*n)->connective = MINUS;
(*n)->son = (*n)->rightson;
(*n)->son->connective = MU;
(*n)->son->leftson = (*n)->leftson;
(*n)->son->rightson = (*n)->rightson->son;
(*n)->rightson = NULL;
(*n)->leftson = NULL;
(*n)->son->son = NULL;
push_multiplications_down( &((*n)->son) );
break;
}
if ( (*n)->rightson->connective == MU ) {
(*n)->leftson->value *= (*n)->rightson->leftson->value;
tmp1 = (*n)->rightson->rightson;
(*n)->rightson->rightson = NULL;
free_ExpNode( (*n)->rightson );
(*n)->rightson = tmp1;
push_multiplications_down( n );
break;
}
/* rigthson is either AD or SU
*/
tmp1 = new_ExpNode( NUMBER );
tmp2 = new_ExpNode( NUMBER );
tmp1->value = (*n)->leftson->value;
tmp2->value = (*n)->leftson->value;
(*n)->connective = (*n)->rightson->connective;
(*n)->leftson->connective = MU;
(*n)->rightson->connective = MU;
(*n)->leftson->leftson = tmp1;
(*n)->leftson->rightson = (*n)->rightson->leftson;
(*n)->rightson->leftson = tmp2;
push_multiplications_down( &((*n)->leftson) );
push_multiplications_down( &((*n)->rightson) );
break;
case AD:
case SU:
push_multiplications_down( &((*n)->leftson) );
push_multiplications_down( &((*n)->rightson) );
break;
case MINUS:
push_multiplications_down( &((*n)->son) );
break;
case NUMBER:
case FHEAD:
break;