src/io/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 ){
             print_tree_error( the_node,
                            "The atom block is not in a molecule 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 RigidBody 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 CUTOFFGROUP_HEAD:
        if( the_namespc.type != MOLECULE_HEAD ){
          print_tree_error( the_node,
                            "The CutoffGroup block is not in a Molecule namespace" );
        }
        else{
          init_cutoffgroup( 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 MEMBERS_STMT:
        switch( the_namespc.type ){
        case BOND_HEAD: // fall through
        case BEND_HEAD: // fall through
        case TORSION_HEAD: 
        case RIGIDBODY_HEAD:
        case CUTOFFGROUP_HEAD: // same for the first four
          init_members( the_node, the_namespc );
          break;

        default:
          print_tree_error( the_node, 
                            "Members statement not in a bond, bend, "
                            "torsion, RigidBody, or CutoffGroup" );
          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 ){
          print_tree_error( the_node,
                            "position statement is not located in an "
                            "atom block" );
        }
        
        init_position( the_node, the_namespc );
        break;

      case ORIENTATION_STMT:
        if( the_namespc.type != ATOM_HEAD ){
          print_tree_error( the_node,
                            "orientation statement is not located in an "
                            "atom 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 CUTOFFGROUP_HEAD:
    sprintf( painCave.errMsg,
             "Parse tree error: CutoffGroup 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 ZCONSTRAINT_HEAD:
    sprintf( painCave.errMsg,
             "Parse tree error: Zconstraint head node error [%d] -> %s\n",
             err_node->index,
             err_msg );
    break;

  case MEMBERS_STMT:
    sprintf( painCave.errMsg,
             "Parse tree error: members node error (nMembers = %d)\n"
             "                  -> %s\n",
             err_node->the_data.mbrs.nMembers,
             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.phi, 
             err_node->the_data.ort.theta, 
             err_node->the_data.ort.psi, 
             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:	1490
Committed:	Fri Sep 24 04:16:43 2004 UTC (21 years, 1 month ago) by gezelter
Content type:	text/plain
File size:	11282 byte(s)
Log Message:	Import of OOPSE v. 2.0
#	User	Rev	Content
1	gezelter	1490	#include <stdlib.h>
2			#include <stdio.h>
3
4			#include "parse_tree.h"
5			#include "simError.h"
6
7			#ifdef IS_MPI
8			#define __is_lex__
9			#include "mpiBASS.h"
10			#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			if( the_namespc.type != MOLECULE_HEAD ){
102			print_tree_error( the_node,
103			"The atom block is not in a molecule 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			if( the_namespc.type != MOLECULE_HEAD ){
115			print_tree_error( the_node,
116			"The RigidBody block is not in a Molecule namespace" );
117			}
118			else{
119			init_rigidbody( the_node->index );
120			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 CUTOFFGROUP_HEAD:
127			if( the_namespc.type != MOLECULE_HEAD ){
128			print_tree_error( the_node,
129			"The CutoffGroup block is not in a Molecule namespace" );
130			}
131			else{
132			init_cutoffgroup( 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 BOND_HEAD:
140			if( the_namespc.type != MOLECULE_HEAD ){
141			print_tree_error( the_node,
142			"The bond block is not in a molecule namespace" );
143			}
144			else{
145			init_bond( 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 BEND_HEAD:
153			if( the_namespc.type != MOLECULE_HEAD ){
154			print_tree_error( the_node,
155			"The bend block is not in a molecule namespace" );
156			}
157			else{
158			init_bend( the_node->index );
159			current_namespc.index = the_node->index;
160			current_namespc.type = the_node->type;
161			walk_down( the_node->stmt_list, current_namespc );
162			}
163			break;
164
165			case TORSION_HEAD:
166			if( the_namespc.type != MOLECULE_HEAD ){
167			print_tree_error( the_node,
168			"The torsion block is not in "
169			"a molecule namespace" );
170			}
171			else{
172			init_torsion( the_node->index );
173			current_namespc.index = the_node->index;
174			current_namespc.type = the_node->type;
175			walk_down( the_node->stmt_list, current_namespc );
176			}
177			break;
178
179			case ZCONSTRAINT_HEAD:
180			if( the_namespc.type != GLOBAL_HEAD ){
181			print_tree_error( the_node,
182			"The Zconstraint block is not in "
183			"the global namespace" );
184			}
185			else{
186			init_zconstraint( the_node->index );
187			current_namespc.index = the_node->index;
188			current_namespc.type = the_node->type;
189			walk_down( the_node->stmt_list, current_namespc );
190			}
191			break;
192
193			default:
194			print_tree_error( the_node, "Not a valid code block" );
195			}
196			}
197
198			else{
199
200			// the node is a statement
201
202			switch( the_node->type ){
203
204			case MEMBERS_STMT:
205			switch( the_namespc.type ){
206			case BOND_HEAD: // fall through
207			case BEND_HEAD: // fall through
208			case TORSION_HEAD:
209			case RIGIDBODY_HEAD:
210			case CUTOFFGROUP_HEAD: // same for the first four
211			init_members( the_node, the_namespc );
212			break;
213
214			default:
215			print_tree_error( the_node,
216			"Members statement not in a bond, bend, "
217			"torsion, RigidBody, or CutoffGroup" );
218			break;
219			}
220			break;
221
222			case CONSTRAINT_STMT:
223			switch( the_namespc.type ){
224			case BOND_HEAD: // fall through
225			case BEND_HEAD: // fall through
226			case TORSION_HEAD: // same for the first three
227			init_constraint( the_node, the_namespc );
228			break;
229
230			default:
231			print_tree_error( the_node,
232			"Constraint statement not in a bond, bend, "
233			"or torsion" );
234			break;
235			}
236			break;
237
238			case ASSIGNMENT_STMT:
239			init_assignment( the_node, the_namespc );
240			break;
241
242			case POSITION_STMT:
243			if( the_namespc.type != ATOM_HEAD ){
244			print_tree_error( the_node,
245			"position statement is not located in an "
246			"atom block" );
247			}
248
249			init_position( the_node, the_namespc );
250			break;
251
252			case ORIENTATION_STMT:
253			if( the_namespc.type != ATOM_HEAD ){
254			print_tree_error( the_node,
255			"orientation statement is not located in an "
256			"atom block" );
257			}
258
259			init_orientation( the_node, the_namespc );
260			break;
261
262			default:
263			print_tree_error( the_node, "unrecognized statement" );
264			break;
265			}
266			}
267
268			// recurse down to the next node
269
270			walk_down( the_node->next_stmt, the_namespc );
271			}
272
273			// send an end of block signal
274			else end_of_block();
275
276			// we're done
277			}
278
279
280
281			/*
282			* This is a routine utilized by the node parsers to make printing
283			* error messages easy.
284			*/
285
286			void print_tree_error( struct node_tag* err_node, char* err_msg ){
287
288			switch( err_node->type ){
289
290			case GLOBAL_HEAD:
291			sprintf( painCave.errMsg,
292			"Parse tree error: global head node error -> %s\n",
293			err_msg );
294			break;
295
296			case COMPONENT_HEAD:
297			sprintf( painCave.errMsg,
298			"Parse tree error: component head node error -> %s\n",
299			err_msg );
300			break;
301
302			case MOLECULE_HEAD:
303			sprintf( painCave.errMsg,
304			"Parse tree error: molecule head node error -> %s\n",
305			err_msg );
306			break;
307
308			case RIGIDBODY_HEAD:
309			sprintf( painCave.errMsg,
310			"Parse tree error: rigidBody head node error -> %s\n",
311			err_msg );
312			break;
313
314			case CUTOFFGROUP_HEAD:
315			sprintf( painCave.errMsg,
316			"Parse tree error: CutoffGroup head node error -> %s\n",
317			err_msg );
318			break;
319
320			case ATOM_HEAD:
321			sprintf( painCave.errMsg,
322			"Parse tree error: atom head node error [%d] -> %s\n",
323			err_node->index,
324			err_msg );
325			break;
326
327			case BOND_HEAD:
328			sprintf( painCave.errMsg,
329			"Parse tree error: bond head node error [%d] -> %s\n",
330			err_node->index,
331			err_msg );
332			break;
333
334			case BEND_HEAD:
335			sprintf( painCave.errMsg,
336			"Parse tree error: bend head node error [%d] -> %s\n",
337			err_node->index,
338			err_msg );
339			break;
340
341			case ZCONSTRAINT_HEAD:
342			sprintf( painCave.errMsg,
343			"Parse tree error: Zconstraint head node error [%d] -> %s\n",
344			err_node->index,
345			err_msg );
346			break;
347
348			case MEMBERS_STMT:
349			sprintf( painCave.errMsg,
350			"Parse tree error: members node error (nMembers = %d)\n"
351			" -> %s\n",
352			err_node->the_data.mbrs.nMembers,
353			err_msg );
354			break;
355
356			case CONSTRAINT_STMT:
357			sprintf( painCave.errMsg,
358			"Parse tree error: constraint node error => ( %lf )\n"
359			" -> %s\n",
360			err_node->the_data.cnstr.constraint_val,
361			err_msg );
362			break;
363
364			case ASSIGNMENT_STMT:
365			sprintf( painCave.errMsg,
366			"Parse tree error: assignment node error\n"
367			" => %s = ",
368			err_node->the_data.asmt.identifier );
369
370			switch( err_node->the_data.asmt.type ){
371
372			case STR_ASSN:
373			sprintf( painCave.errMsg,
374			"%s",
375			err_node->the_data.asmt.rhs.str_ptr );
376			break;
377
378			case INT_ASSN:
379			sprintf( painCave.errMsg,
380			"%d",
381			err_node->the_data.asmt.rhs.i_val );
382			break;
383
384			case DOUBLE_ASSN:
385			sprintf( painCave.errMsg,
386			"%lf",
387			err_node->the_data.asmt.rhs.d_val );
388			break;
389			}
390
391			sprintf( painCave.errMsg,
392			"\n"
393			" -> %s\n",
394			err_msg );
395			break;
396
397			case POSITION_STMT:
398			sprintf( painCave.errMsg,
399			"Parse tree error: position node error => ( %lf, %lf, %lf )\n"
400			" -> %s\n",
401			err_node->the_data.pos.x,
402			err_node->the_data.pos.y,
403			err_node->the_data.pos.z,
404			err_msg );
405			break;
406
407			case ORIENTATION_STMT:
408			sprintf( painCave.errMsg,
409			"Parse tree error: orientation node error => ( %lf, %lf, %lf )\n"
410			" -> %s\n",
411			err_node->the_data.ort.phi,
412			err_node->the_data.ort.theta,
413			err_node->the_data.ort.psi,
414			err_msg );
415			break;
416
417			default:
418			sprintf( painCave.errMsg,
419			"Parse tree error: unknown node type -> %s\n",
420			err_msg );
421			}
422
423			painCave.isFatal = 1;
424			simError();
425			#ifdef IS_MPI
426			mpiInterfaceExit();
427			#endif //is_mpi
428
429			}
430
431
432			/*
433			* recursive walkdown and kill of the node tree
434			* note: looks mighty similar to the walkdown routine.
435			*/
436
437			void kill_tree( struct node_tag* the_node ){
438
439
440			if( the_node != NULL ){
441
442			if( the_node->stmt_list != NULL ){
443
444			// the statement is a block node of some sort
445
446			kill_tree( the_node->stmt_list );
447			}
448
449			else{
450
451			// the node is a statement
452
453			switch( the_node->type ){
454
455			case ASSIGNMENT_STMT:
456
457			if( the_node->the_data.asmt.type == STR_ASSN )
458			free( the_node->the_data.asmt.rhs.str_ptr );
459
460			free( the_node->the_data.asmt.identifier );
461			break;
462
463			default:
464			// nothing to do here, everyone else can be freed normally.
465			break;
466			}
467			}
468
469			// recurse down to the next node
470
471			kill_tree( the_node->next_stmt );
472			free( the_node );
473			}
474
475			// we're done
476			}