OOPSE/libBASS/parse_tree.c

#include <stdlib.h>
#include <stdio.h>

#include "parse_tree.h"
#include "simError.h"

#ifdef IS_MPI
#define __is_lex__
#include "mpiBASS.h"
#endif

void walk_down( struct node_tag* the_node, struct namespc the_namespc );
int mol_index; // keeps track of the number of molecules
int comp_index; // keeps track of the number of components.

/*
 * This is the parse tree function that is called by the yacc
 * routine. It passes the global node and namespace to the recursive
 * walk_down routine to explore the node tree.
 */

void pt_me( struct node_tag* head_node ){

  struct namespc global_namespc;
  
  if( head_node->type != GLOBAL_HEAD ){
    sprintf( painCave.errMsg, 
             "Parse tree error: The head node was not the global node.\n" );
    painCave.isFatal = 1;
    simError();
#ifdef IS_MPI
    mpiInterfaceExit();
#endif //is_mpi
  }

  global_namespc.index = 0;
  global_namespc.type = GLOBAL_HEAD;

  mol_index = 0;
  comp_index = 0;
  walk_down( head_node->next_stmt, global_namespc ); 
  // closed global namespace and exit

}

/*
 * This is the main logic workhorse routine for the node tree
 * parser. It recursively walks down the node list and calls the
 * appropriate interface functions acording to the node types. It will
 * also set the appropriate namespace for the nodes.  
 *
 *       Note: the nodes only know about the namespace of their
 *       current level, the namespace above themselves is hidden.
 */

void walk_down( struct node_tag* the_node, struct namespc the_namespc ){
  
  struct namespc current_namespc;

  if( the_node != NULL ){
    
    if( the_node->type == GLOBAL_HEAD ){
      print_tree_error( the_node, "Too many global regions" );
    }

    if( the_node->stmt_list != NULL ){

      // the statement is a block node of some sort
      
      switch( the_node->type ){

      case COMPONENT_HEAD:
        if( the_namespc.type != GLOBAL_HEAD ){
          print_tree_error( the_node, 
                            "component block is not in the global namespace" );
        }
        else{
          init_component( comp_index );
          current_namespc.index = comp_index;
          current_namespc.type = COMPONENT_HEAD;
          walk_down( the_node->stmt_list, current_namespc );
          comp_index++;
        }
        break;

      case MOLECULE_HEAD:
        if( the_namespc.type != GLOBAL_HEAD ){
          print_tree_error( the_node, 
                            "Molecule block is not in the global namespace" );
        }
        else{
          init_molecule( mol_index );
          current_namespc.index = mol_index;
          current_namespc.type = MOLECULE_HEAD;
          walk_down( the_node->stmt_list, current_namespc );
          mol_index++;
        }
        break;

      case ATOM_HEAD:
        if( the_namespc.type != MOLECULE_HEAD && the_namespc.type != RIGIDBODY_HEAD ){
             print_tree_error( the_node,
                            "The atom block is not in a molecule or rigidBody namespace" );
        }
        else{
          init_atom( the_node->index );
          current_namespc.index = the_node->index;
          current_namespc.type = the_node->type;
          walk_down( the_node->stmt_list, current_namespc );
        }
        break;

      case RIGIDBODY_HEAD:
        if( the_namespc.type != MOLECULE_HEAD ){
          print_tree_error( the_node,
                            "The rigid body block is not in a molecule namespace" );
        }
        else{
          init_rigidbody( the_node->index );
          current_namespc.index = the_node->index;
          current_namespc.type = the_node->type;
          walk_down( the_node->stmt_list, current_namespc );
        }
        break;
        
      case BOND_HEAD:
        if( the_namespc.type != MOLECULE_HEAD ){
          print_tree_error( the_node,
                            "The bond block is not in a molecule namespace" );
        }
        else{
          init_bond( the_node->index );
          current_namespc.index = the_node->index;
          current_namespc.type = the_node->type;
          walk_down( the_node->stmt_list, current_namespc );
        }
        break;

      case BEND_HEAD:
        if( the_namespc.type != MOLECULE_HEAD ){
          print_tree_error( the_node,
                            "The bend block is not in a molecule namespace" );
        }
        else{
          init_bend( the_node->index );
          current_namespc.index = the_node->index;
          current_namespc.type = the_node->type;
          walk_down( the_node->stmt_list, current_namespc );
        }
        break;

      case TORSION_HEAD:
        if( the_namespc.type != MOLECULE_HEAD ){
          print_tree_error( the_node,
                            "The torsion block is not in "
                            "a molecule namespace" );
        }
        else{
          init_torsion( the_node->index );
          current_namespc.index = the_node->index;
          current_namespc.type = the_node->type;
          walk_down( the_node->stmt_list, current_namespc );
        }
        break;
      
      case ZCONSTRAINT_HEAD:
        if( the_namespc.type != GLOBAL_HEAD ){
          print_tree_error( the_node,
                            "The Zconstraint block is not in "
                            "the global namespace" );
        }
        else{
          init_zconstraint( the_node->index );
          current_namespc.index = the_node->index;
          current_namespc.type = the_node->type;
          walk_down( the_node->stmt_list, current_namespc );
        }
        break;
        
      default:
        print_tree_error( the_node, "Not a valid code block" );
      }
    }
    
    else{
      
      // the node is a statement 

      switch( the_node->type ){

      case MEMBER_STMT:
        switch( the_namespc.type ){
        case BOND_HEAD: // fall through
        case BEND_HEAD: // fall through
        case TORSION_HEAD: // same for the first three
          init_members( the_node, the_namespc );
          break;

        default:
          print_tree_error( the_node, 
                            "Member statement not in a bond, bend, "
                            "or torsion" );
          break;
        }
        break;

      case CONSTRAINT_STMT:
        switch( the_namespc.type ){
        case BOND_HEAD: // fall through
        case BEND_HEAD: // fall through
        case TORSION_HEAD: // same for the first three
          init_constraint( the_node, the_namespc );
          break;

        default:
          print_tree_error( the_node, 
                            "Constraint statement not in a bond, bend, "
                            "or torsion" );
          break;
        }
        break;

      case ASSIGNMENT_STMT:
        init_assignment( the_node, the_namespc );
        break;

      case POSITION_STMT:
        if( the_namespc.type != ATOM_HEAD && the_namespc.type != RIGIDBODY_HEAD){
          print_tree_error( the_node,
                            "position statement is not located in an "
                            "atom or rigidBody block" );
        }
        
        init_position( the_node, the_namespc );
        break;

      case ORIENTATION_STMT:
        if( the_namespc.type != ATOM_HEAD && the_namespc.type != RIGIDBODY_HEAD){
          print_tree_error( the_node,
                            "orientation statement is not located in an "
                            "atom or rigidBody block" );
        }
        
        init_orientation( the_node, the_namespc );
        break;

      default:
        print_tree_error( the_node, "unrecognized statement" );
        break;
      }
    }
    
    // recurse down to the next node

    walk_down( the_node->next_stmt, the_namespc );
  }

  // send an end of block signal
  else end_of_block();
  
  // we're done
}


/*
 * This is a routine utilized by the node parsers to make printing
 * error messages easy.
 */

void print_tree_error( struct node_tag* err_node, char* err_msg ){

  switch( err_node->type ){

  case GLOBAL_HEAD:
    sprintf( painCave.errMsg,
             "Parse tree error: global head node error -> %s\n",
             err_msg );
    break;
    
  case COMPONENT_HEAD:
    sprintf( painCave.errMsg,
             "Parse tree error: component head node error -> %s\n",
             err_msg );
    break;

  case MOLECULE_HEAD:
    sprintf( painCave.errMsg,
             "Parse tree error: molecule head node error -> %s\n",
             err_msg );
    break;

  case RIGIDBODY_HEAD:
    sprintf( painCave.errMsg,
             "Parse tree error: rigidBody head node error -> %s\n",
             err_msg );
    break;

  case ATOM_HEAD:
    sprintf( painCave.errMsg,
             "Parse tree error: atom head node error [%d] -> %s\n",
             err_node->index,
             err_msg );
    break;
    
  case BOND_HEAD:
    sprintf( painCave.errMsg,
             "Parse tree error: bond head node error [%d] -> %s\n",
             err_node->index,
             err_msg );
    break;
    
  case BEND_HEAD:
    sprintf( painCave.errMsg,
             "Parse tree error: bend head node error [%d] -> %s\n",
             err_node->index,
             err_msg );
    break;
    
  case TORSION_HEAD:
    sprintf( painCave.errMsg,
             "Parse tree error: torsion head node error [%d] -> %s\n",
             err_node->index,
             err_msg );
    break;
  
  case ZCONSTRAINT_HEAD:
    sprintf( painCave.errMsg,
             "Parse tree error: Zconstraint head node error [%d] -> %s\n",
             err_node->index,
             err_msg );
    break;

  case MEMBER_STMT:
    sprintf( painCave.errMsg,
             "Parse tree error: member node error => ( %d, %d, %d, %d )\n"
             "                  -> %s\n",
             err_node->the_data.mbr.a,
             err_node->the_data.mbr.b,
             err_node->the_data.mbr.c,
             err_node->the_data.mbr.d,
             err_msg );
    break;

  case CONSTRAINT_STMT:
    sprintf( painCave.errMsg,
            "Parse tree error: constraint node error => ( %lf )\n"
            "                 -> %s\n",
            err_node->the_data.cnstr.constraint_val,
            err_msg );
    break;
    
  case ASSIGNMENT_STMT:
    sprintf( painCave.errMsg,
             "Parse tree error: assignment node error\n"
             "                  => %s = ",
             err_node->the_data.asmt.identifier );
    
    switch( err_node->the_data.asmt.type ){
      
    case STR_ASSN:
      sprintf( painCave.errMsg,
               "%s",
               err_node->the_data.asmt.rhs.str_ptr );
      break;
      
    case INT_ASSN:
      sprintf( painCave.errMsg,
               "%d",
               err_node->the_data.asmt.rhs.i_val );
      break;
      
    case DOUBLE_ASSN:
      sprintf( painCave.errMsg,
               "%lf",
               err_node->the_data.asmt.rhs.d_val );
      break;
    }
    
    sprintf( painCave.errMsg,
             "\n"
             "                  -> %s\n",
             err_msg );
    break;

  case POSITION_STMT:
    sprintf( painCave.errMsg,
             "Parse tree error: position node error => ( %lf, %lf, %lf )\n"
             "                  -> %s\n",
             err_node->the_data.pos.x, 
             err_node->the_data.pos.y, 
             err_node->the_data.pos.z, 
             err_msg );
    break;

  case ORIENTATION_STMT:
    sprintf( painCave.errMsg,
             "Parse tree error: orientation node error => ( %lf, %lf, %lf )\n"
             "                  -> %s\n",
             err_node->the_data.ort.x, 
             err_node->the_data.ort.y, 
             err_node->the_data.ort.z, 
             err_msg );
    break;

  default:
    sprintf( painCave.errMsg,
             "Parse tree error: unknown node type -> %s\n",
             err_msg );
  }

  painCave.isFatal = 1;
  simError();
#ifdef IS_MPI
  mpiInterfaceExit();
#endif //is_mpi

}


/*
 * recursive walkdown and kill of the node tree
 * note: looks mighty similar to the walkdown routine.
 */ 
  
void kill_tree( struct node_tag* the_node ){
  

  if( the_node != NULL ){
    
    if( the_node->stmt_list != NULL ){

      // the statement is a block node of some sort
      
      kill_tree( the_node->stmt_list );
    }
    
    else{
      
      // the node is a statement 

      switch( the_node->type ){

      case ASSIGNMENT_STMT:
        
        if( the_node->the_data.asmt.type == STR_ASSN )
          free( the_node->the_data.asmt.rhs.str_ptr );
        
        free( the_node->the_data.asmt.identifier );
        break;

      default:
        // nothing to do here, everyone else can be freed normally.
        break;
      }
    }
    
    // recurse down to the next node

    kill_tree( the_node->next_stmt );
    free( the_node );    
  }

  // we're done
}
Revision:	957
Committed:	Mon Jan 19 16:08:21 2004 UTC (20 years, 7 months ago) by gezelter
Content type:	text/plain
File size:	11072 byte(s)
Log Message:	BASS changes to add RigidBodies and LJrcut
#	User	Rev	Content
1	mmeineke	377	#include <stdlib.h>
2			#include <stdio.h>
3
4	mmeineke	854	#include "parse_tree.h"
5			#include "simError.h"
6	mmeineke	377
7			#ifdef IS_MPI
8			#define __is_lex__
9	mmeineke	854	#include "mpiBASS.h"
10	mmeineke	377	#endif
11
12			void walk_down( struct node_tag* the_node, struct namespc the_namespc );
13			int mol_index; // keeps track of the number of molecules
14			int comp_index; // keeps track of the number of components.
15
16			/*
17			* This is the parse tree function that is called by the yacc
18			* routine. It passes the global node and namespace to the recursive
19			* walk_down routine to explore the node tree.
20			*/
21
22			void pt_me( struct node_tag* head_node ){
23
24			struct namespc global_namespc;
25
26			if( head_node->type != GLOBAL_HEAD ){
27			sprintf( painCave.errMsg,
28			"Parse tree error: The head node was not the global node.\n" );
29			painCave.isFatal = 1;
30			simError();
31			#ifdef IS_MPI
32			mpiInterfaceExit();
33			#endif //is_mpi
34			}
35
36			global_namespc.index = 0;
37			global_namespc.type = GLOBAL_HEAD;
38
39			mol_index = 0;
40			comp_index = 0;
41			walk_down( head_node->next_stmt, global_namespc );
42			// closed global namespace and exit
43
44			}
45
46			/*
47			* This is the main logic workhorse routine for the node tree
48			* parser. It recursively walks down the node list and calls the
49			* appropriate interface functions acording to the node types. It will
50			* also set the appropriate namespace for the nodes.
51			*
52			* Note: the nodes only know about the namespace of their
53			* current level, the namespace above themselves is hidden.
54			*/
55
56			void walk_down( struct node_tag* the_node, struct namespc the_namespc ){
57
58			struct namespc current_namespc;
59
60			if( the_node != NULL ){
61
62			if( the_node->type == GLOBAL_HEAD ){
63			print_tree_error( the_node, "Too many global regions" );
64			}
65
66			if( the_node->stmt_list != NULL ){
67
68			// the statement is a block node of some sort
69
70			switch( the_node->type ){
71
72			case COMPONENT_HEAD:
73			if( the_namespc.type != GLOBAL_HEAD ){
74			print_tree_error( the_node,
75			"component block is not in the global namespace" );
76			}
77			else{
78			init_component( comp_index );
79			current_namespc.index = comp_index;
80			current_namespc.type = COMPONENT_HEAD;
81			walk_down( the_node->stmt_list, current_namespc );
82			comp_index++;
83			}
84			break;
85
86			case MOLECULE_HEAD:
87			if( the_namespc.type != GLOBAL_HEAD ){
88			print_tree_error( the_node,
89			"Molecule block is not in the global namespace" );
90			}
91			else{
92			init_molecule( mol_index );
93			current_namespc.index = mol_index;
94			current_namespc.type = MOLECULE_HEAD;
95			walk_down( the_node->stmt_list, current_namespc );
96			mol_index++;
97			}
98			break;
99
100			case ATOM_HEAD:
101	gezelter	957	if( the_namespc.type != MOLECULE_HEAD && the_namespc.type != RIGIDBODY_HEAD ){
102			print_tree_error( the_node,
103			"The atom block is not in a molecule or rigidBody namespace" );
104			}
105			else{
106			init_atom( the_node->index );
107			current_namespc.index = the_node->index;
108			current_namespc.type = the_node->type;
109			walk_down( the_node->stmt_list, current_namespc );
110			}
111			break;
112
113			case RIGIDBODY_HEAD:
114	mmeineke	377	if( the_namespc.type != MOLECULE_HEAD ){
115			print_tree_error( the_node,
116	gezelter	957	"The rigid body block is not in a molecule namespace" );
117	mmeineke	377	}
118			else{
119	gezelter	957	init_rigidbody( the_node->index );
120	mmeineke	377	current_namespc.index = the_node->index;
121			current_namespc.type = the_node->type;
122			walk_down( the_node->stmt_list, current_namespc );
123			}
124			break;
125
126			case BOND_HEAD:
127			if( the_namespc.type != MOLECULE_HEAD ){
128			print_tree_error( the_node,
129			"The bond block is not in a molecule namespace" );
130			}
131			else{
132			init_bond( the_node->index );
133			current_namespc.index = the_node->index;
134			current_namespc.type = the_node->type;
135			walk_down( the_node->stmt_list, current_namespc );
136			}
137			break;
138
139			case BEND_HEAD:
140			if( the_namespc.type != MOLECULE_HEAD ){
141			print_tree_error( the_node,
142			"The bend block is not in a molecule namespace" );
143			}
144			else{
145			init_bend( the_node->index );
146			current_namespc.index = the_node->index;
147			current_namespc.type = the_node->type;
148			walk_down( the_node->stmt_list, current_namespc );
149			}
150			break;
151
152			case TORSION_HEAD:
153			if( the_namespc.type != MOLECULE_HEAD ){
154			print_tree_error( the_node,
155			"The torsion block is not in "
156			"a molecule namespace" );
157			}
158			else{
159			init_torsion( the_node->index );
160			current_namespc.index = the_node->index;
161			current_namespc.type = the_node->type;
162			walk_down( the_node->stmt_list, current_namespc );
163			}
164			break;
165	mmeineke	675
166			case ZCONSTRAINT_HEAD:
167			if( the_namespc.type != GLOBAL_HEAD ){
168			print_tree_error( the_node,
169			"The Zconstraint block is not in "
170			"the global namespace" );
171			}
172			else{
173			init_zconstraint( the_node->index );
174			current_namespc.index = the_node->index;
175			current_namespc.type = the_node->type;
176			walk_down( the_node->stmt_list, current_namespc );
177			}
178			break;
179	mmeineke	377
180			default:
181			print_tree_error( the_node, "Not a valid code block" );
182			}
183			}
184
185			else{
186
187			// the node is a statement
188
189			switch( the_node->type ){
190
191			case MEMBER_STMT:
192			switch( the_namespc.type ){
193			case BOND_HEAD: // fall through
194			case BEND_HEAD: // fall through
195			case TORSION_HEAD: // same for the first three
196			init_members( the_node, the_namespc );
197			break;
198
199			default:
200			print_tree_error( the_node,
201			"Member statement not in a bond, bend, "
202			"or torsion" );
203			break;
204			}
205			break;
206
207			case CONSTRAINT_STMT:
208			switch( the_namespc.type ){
209			case BOND_HEAD: // fall through
210			case BEND_HEAD: // fall through
211			case TORSION_HEAD: // same for the first three
212			init_constraint( the_node, the_namespc );
213			break;
214
215			default:
216			print_tree_error( the_node,
217			"Constraint statement not in a bond, bend, "
218			"or torsion" );
219			break;
220			}
221			break;
222
223			case ASSIGNMENT_STMT:
224			init_assignment( the_node, the_namespc );
225			break;
226
227			case POSITION_STMT:
228	gezelter	957	if( the_namespc.type != ATOM_HEAD && the_namespc.type != RIGIDBODY_HEAD){
229	mmeineke	377	print_tree_error( the_node,
230			"position statement is not located in an "
231	gezelter	957	"atom or rigidBody block" );
232	mmeineke	377	}
233
234			init_position( the_node, the_namespc );
235			break;
236
237			case ORIENTATION_STMT:
238	gezelter	957	if( the_namespc.type != ATOM_HEAD && the_namespc.type != RIGIDBODY_HEAD){
239	mmeineke	377	print_tree_error( the_node,
240			"orientation statement is not located in an "
241	gezelter	957	"atom or rigidBody block" );
242	mmeineke	377	}
243
244			init_orientation( the_node, the_namespc );
245			break;
246
247			default:
248			print_tree_error( the_node, "unrecognized statement" );
249			break;
250			}
251			}
252
253			// recurse down to the next node
254
255			walk_down( the_node->next_stmt, the_namespc );
256			}
257
258			// send an end of block signal
259			else end_of_block();
260
261			// we're done
262			}
263
264
265
266			/*
267			* This is a routine utilized by the node parsers to make printing
268			* error messages easy.
269			*/
270
271			void print_tree_error( struct node_tag* err_node, char* err_msg ){
272
273			switch( err_node->type ){
274
275			case GLOBAL_HEAD:
276			sprintf( painCave.errMsg,
277			"Parse tree error: global head node error -> %s\n",
278			err_msg );
279			break;
280
281			case COMPONENT_HEAD:
282			sprintf( painCave.errMsg,
283			"Parse tree error: component head node error -> %s\n",
284			err_msg );
285			break;
286
287			case MOLECULE_HEAD:
288			sprintf( painCave.errMsg,
289			"Parse tree error: molecule head node error -> %s\n",
290			err_msg );
291			break;
292
293	gezelter	957	case RIGIDBODY_HEAD:
294			sprintf( painCave.errMsg,
295			"Parse tree error: rigidBody head node error -> %s\n",
296			err_msg );
297			break;
298
299	mmeineke	377	case ATOM_HEAD:
300			sprintf( painCave.errMsg,
301			"Parse tree error: atom head node error [%d] -> %s\n",
302			err_node->index,
303			err_msg );
304			break;
305
306			case BOND_HEAD:
307			sprintf( painCave.errMsg,
308			"Parse tree error: bond head node error [%d] -> %s\n",
309			err_node->index,
310			err_msg );
311			break;
312
313			case BEND_HEAD:
314			sprintf( painCave.errMsg,
315			"Parse tree error: bend head node error [%d] -> %s\n",
316			err_node->index,
317			err_msg );
318			break;
319
320			case TORSION_HEAD:
321			sprintf( painCave.errMsg,
322			"Parse tree error: torsion head node error [%d] -> %s\n",
323			err_node->index,
324			err_msg );
325			break;
326	mmeineke	675
327			case ZCONSTRAINT_HEAD:
328			sprintf( painCave.errMsg,
329			"Parse tree error: Zconstraint head node error [%d] -> %s\n",
330			err_node->index,
331			err_msg );
332			break;
333
334	mmeineke	377	case MEMBER_STMT:
335			sprintf( painCave.errMsg,
336			"Parse tree error: member node error => ( %d, %d, %d, %d )\n"
337			" -> %s\n",
338			err_node->the_data.mbr.a,
339			err_node->the_data.mbr.b,
340			err_node->the_data.mbr.c,
341			err_node->the_data.mbr.d,
342			err_msg );
343			break;
344
345			case CONSTRAINT_STMT:
346			sprintf( painCave.errMsg,
347			"Parse tree error: constraint node error => ( %lf )\n"
348			" -> %s\n",
349			err_node->the_data.cnstr.constraint_val,
350			err_msg );
351			break;
352
353			case ASSIGNMENT_STMT:
354			sprintf( painCave.errMsg,
355			"Parse tree error: assignment node error\n"
356			" => %s = ",
357			err_node->the_data.asmt.identifier );
358
359			switch( err_node->the_data.asmt.type ){
360
361			case STR_ASSN:
362			sprintf( painCave.errMsg,
363			"%s",
364			err_node->the_data.asmt.rhs.str_ptr );
365			break;
366
367			case INT_ASSN:
368			sprintf( painCave.errMsg,
369			"%d",
370			err_node->the_data.asmt.rhs.i_val );
371			break;
372
373			case DOUBLE_ASSN:
374			sprintf( painCave.errMsg,
375			"%lf",
376			err_node->the_data.asmt.rhs.d_val );
377			break;
378			}
379
380			sprintf( painCave.errMsg,
381			"\n"
382			" -> %s\n",
383			err_msg );
384			break;
385
386			case POSITION_STMT:
387			sprintf( painCave.errMsg,
388			"Parse tree error: position node error => ( %lf, %lf, %lf )\n"
389			" -> %s\n",
390			err_node->the_data.pos.x,
391			err_node->the_data.pos.y,
392			err_node->the_data.pos.z,
393			err_msg );
394			break;
395
396			case ORIENTATION_STMT:
397			sprintf( painCave.errMsg,
398			"Parse tree error: orientation node error => ( %lf, %lf, %lf )\n"
399			" -> %s\n",
400			err_node->the_data.ort.x,
401			err_node->the_data.ort.y,
402			err_node->the_data.ort.z,
403			err_msg );
404			break;
405
406			default:
407			sprintf( painCave.errMsg,
408			"Parse tree error: unknown node type -> %s\n",
409			err_msg );
410			}
411
412			painCave.isFatal = 1;
413			simError();
414			#ifdef IS_MPI
415			mpiInterfaceExit();
416			#endif //is_mpi
417
418			}
419
420
421			/*
422			* recursive walkdown and kill of the node tree
423			* note: looks mighty similar to the walkdown routine.
424			*/
425
426			void kill_tree( struct node_tag* the_node ){
427
428
429			if( the_node != NULL ){
430
431			if( the_node->stmt_list != NULL ){
432
433			// the statement is a block node of some sort
434
435			kill_tree( the_node->stmt_list );
436			}
437
438			else{
439
440			// the node is a statement
441
442			switch( the_node->type ){
443
444			case ASSIGNMENT_STMT:
445
446			if( the_node->the_data.asmt.type == STR_ASSN )
447			free( the_node->the_data.asmt.rhs.str_ptr );
448
449			free( the_node->the_data.asmt.identifier );
450			break;
451
452			default:
453			// nothing to do here, everyone else can be freed normally.
454			break;
455			}
456			}
457
458			// recurse down to the next node
459
460			kill_tree( the_node->next_stmt );
461			free( the_node );
462			}
463
464			// we're done
465			}