mdtools/BASS_parse/BASS_parse.c

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

#include "BASS_parse.h"

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

#define HASH_SIZE 211 // the size of the hash table
#define SHIFT 4 // the bit shift for the hash index calculation


//*** Global functions, variables, and structures ************

unsigned short is_initialized = 0; // tells whether to init the linked list

// reserved word elements for the hash table
struct res_element{
  char word[100];        //the reserved word
  int token;             //the token to return;
  struct res_element* next;
};

struct res_element** reserved = NULL; //the table of reserved words

void initialize_res_list(void); // function to initialize the list

int hash ( char* text ); // generates the hash key

void add_res_element( char* text, int the_token ); //adds elements to the table

// the elements of the defined Hash table
struct defined_element{
  char defined[100];
  char definition[DEFINED_BUFFER_SIZE];
  struct defined_element* next;
};

struct defined_element** defined_list = NULL; // the defined hash table


//*** The Functions *******************************************


/*
  function to initialize the list of reserved words into memory.
*/

void initialize_res_list(){
  
  register unsigned short i; // loop counter

  reserved = ( struct res_element ** ) 
    calloc( HASH_SIZE, sizeof( struct hash__element* ) );

  for( i=0; i < HASH_SIZE; i++ ){
    
    reserved[i] = NULL;
  }

  // add the reserved words

  add_res_element( "molecule", MOLECULE );
  add_res_element( "atom", ATOM );
  add_res_element( "bond", BOND );
  add_res_element( "bend", BEND );
  add_res_element( "torsion", TORSION );
  add_res_element( "position", POSITION );
  add_res_element( "members", MEMBERS );
  add_res_element( "constraint", CONSTRAINT );
  add_res_element( "component", COMPONENT );
  add_res_element( "startIndex", START_INDEX );
  add_res_element( "orientation", ORIENTATION );
  
  is_initialized = 1; // set the initialization boolean to true
}


/*
   checks for reserved words.
   If a reserved word is found, returns the token,
   else returns 0.
*/

int res_word( char* text ){
  
  int matched = 0;
  int key; // the hash key
  struct res_element* current_ptr; // points to the current hash element
  struct defined_element* def_ptr; // points to the current define element

  if( !is_initialized ){ // initialize the list if not already done

    initialize_res_list();
  }
  
  // get the hash key

  key = hash( text );
  current_ptr = reserved[key];

  // walk through possible mutiple entries

  while( current_ptr != NULL ){
    
    matched = !strcmp( text, current_ptr->word );
    if( matched ) return current_ptr->token; // search successful

    current_ptr = current_ptr->next;
  }

  // if no keywords turn up, check the word against the list of defines
  
  if( defined_list != NULL ){
    def_ptr = defined_list[key];
    
    while( def_ptr != NULL ){
      
      matched = !strcmp( text, def_ptr->defined );
      if( matched ) return DEFINED;
      
      def_ptr = def_ptr->next;
    }
  }

  return 0; //search failed
}

/*
 * This is used to test whether a given word is defined
 * returns 1 if true, 0 if False.
 */

int is_defined( char* text ){

  int matched = 0;
  int key;
  struct defined_element* def_ptr; // points to the current define element
  
  key = hash( text );

  if( defined_list != NULL ){
        def_ptr = defined_list[key];
    
    while( def_ptr != NULL ){
      
      matched = !strcmp( text, def_ptr->defined );
      if( matched ) return 1; // search succesful
      
      def_ptr = def_ptr->next;
    }
  }

  return 0; //search failed
}

/*
 * The next bit returns the text to substitute for any given define.
 */

char* get_definition( char* defined ){
  int key;
  int matched = 0;
  struct defined_element* def_ptr;
  
  if( defined_list != NULL ){

    key = hash( defined );
    def_ptr = defined_list[key];
    
    while( def_ptr != NULL ){
      
      matched = !strcmp( defined, def_ptr->defined );
      if( matched ) return def_ptr->definition;
      
      def_ptr = def_ptr->next;
    }
  }
  
  // search failed, therefore there is an error

  fprintf( stderr, "%s was not found in the defined list\n", defined );
#ifdef IS_MPI
  mpiInterfaceExit();
#endif
  exit(0);
  return NULL;
}
 
/*
 * Add a define statement to the hash table
 */

void insert_define( char* defined, char* definition ){
  
  int i, key;
  struct defined_element* element;

  if( defined_list == NULL ){
    
    defined_list = ( struct defined_element** )
      calloc( HASH_SIZE, sizeof( struct defined_element* ) );
    
    for( i=0; i<HASH_SIZE; i++ ){

      defined_list[i] = NULL;
    }
  }

  key = hash( defined );
  element = (struct defined_element* )
    malloc( sizeof( struct defined_element ) );

  // fill the element
  
  strcpy( element->defined, defined );
  strcpy( element->definition, definition );

  // add the element to the table

  element->next = defined_list[key];
  defined_list[key] = element;
}

/*
 * adds an element to the hash table
 */

void add_res_element( char* text, int the_token ){
  
  int key; // the calculated hash key;
  struct res_element* element; // the element being added

  key = hash( text );
  element = (struct res_element *) malloc( sizeof( struct res_element ) );
  
  // fill the element

  strcpy( element->word, text );
  element->token = the_token;

  // add the element to the table

  element->next = reserved[key];
  reserved[key] = element;
}

/*
  generartes the hash key from the given word.
*/

int hash ( char* text ){

  register unsigned short int i = 0; // loop counter
  int key = 0; // the hash key

  while( text[i] != '\0' ){

    key = ( ( key << SHIFT ) + text[i] ) % HASH_SIZE;
    
    i++;
  }
  
  if( key < 0 ){

    // if the key is less than zero, we've had an overflow error

    fprintf( stderr,
             "There has been an overflow error in the hash key.");
#ifdef IS_MPI
    mpiInterfaceExit();
#endif
    exit(0);
  }
  
  return key;
}

/*
  function to clean up the memory after we are finished with the lists
*/

void kill_lists( ){
  
  struct res_element* current_res_ptr;
  struct res_element* temp_res_ptr;

  struct defined_element* current_def_ptr;
  struct defined_element* temp_def_ptr;

  register unsigned short int i;

  if( reserved != NULL ){

    for( i=0; i < HASH_SIZE; i++){
      
      current_res_ptr = reserved[i];
      
      while( current_res_ptr != NULL ){
        
        temp_res_ptr = current_res_ptr->next;
        free( current_res_ptr );
        current_res_ptr = temp_res_ptr;
      }
    }    

    free( reserved );
  }

  if( defined_list != NULL ){

    for( i=0; i < HASH_SIZE; i++){
      
      current_def_ptr = defined_list[i];
      
      while( current_def_ptr != NULL ){
        
        temp_def_ptr = current_def_ptr->next;
        free( current_def_ptr );
        current_def_ptr = temp_def_ptr;
      }
    }    

    free( defined_list );
  }

  reserved = NULL;
  defined_list = NULL;

  is_initialized = 0; // initialization is now false
}
Revision:	138
Committed:	Wed Oct 16 21:07:02 2002 UTC (22 years, 6 months ago) by chuckv
Content type:	text/plain
File size:	7090 byte(s)
Log Message:	changed mpiInterface.c and .h -> mpiBASS.c and .h for clarity of purpose
#	Content
1	#include <stdio.h>
2	#include <stdlib.h>
3	#include <string.h>
4
5	#include "BASS_parse.h"
6
7	#ifdef IS_MPI
8	#define __is_lex__
9	#include "../headers/mpiBASS.h"
10	#endif
11
12	#define HASH_SIZE 211 // the size of the hash table
13	#define SHIFT 4 // the bit shift for the hash index calculation
14
15
16
17	//* Global functions, variables, and structures **********
18
19	unsigned short is_initialized = 0; // tells whether to init the linked list
20
21	// reserved word elements for the hash table
22	struct res_element{
23	char word[100]; //the reserved word
24	int token; //the token to return;
25	struct res_element* next;
26	};
27
28	struct res_element** reserved = NULL; //the table of reserved words
29
30	void initialize_res_list(void); // function to initialize the list
31
32	int hash ( char* text ); // generates the hash key
33
34	void add_res_element( char* text, int the_token ); //adds elements to the table
35
36	// the elements of the defined Hash table
37	struct defined_element{
38	char defined[100];
39	char definition[DEFINED_BUFFER_SIZE];
40	struct defined_element* next;
41	};
42
43	struct defined_element** defined_list = NULL; // the defined hash table
44
45
46
47	//* The Functions *****************************************
48
49
50	/*
51	function to initialize the list of reserved words into memory.
52	*/
53
54	void initialize_res_list(){
55
56	register unsigned short i; // loop counter
57
58	reserved = ( struct res_element ** )
59	calloc( HASH_SIZE, sizeof( struct hash__element* ) );
60
61	for( i=0; i < HASH_SIZE; i++ ){
62
63	reserved[i] = NULL;
64	}
65
66	// add the reserved words
67
68	add_res_element( "molecule", MOLECULE );
69	add_res_element( "atom", ATOM );
70	add_res_element( "bond", BOND );
71	add_res_element( "bend", BEND );
72	add_res_element( "torsion", TORSION );
73	add_res_element( "position", POSITION );
74	add_res_element( "members", MEMBERS );
75	add_res_element( "constraint", CONSTRAINT );
76	add_res_element( "component", COMPONENT );
77	add_res_element( "startIndex", START_INDEX );
78	add_res_element( "orientation", ORIENTATION );
79
80	is_initialized = 1; // set the initialization boolean to true
81	}
82
83
84	/*
85	checks for reserved words.
86	If a reserved word is found, returns the token,
87	else returns 0.
88	*/
89
90	int res_word( char* text ){
91
92	int matched = 0;
93	int key; // the hash key
94	struct res_element* current_ptr; // points to the current hash element
95	struct defined_element* def_ptr; // points to the current define element
96
97	if( !is_initialized ){ // initialize the list if not already done
98
99	initialize_res_list();
100	}
101
102	// get the hash key
103
104	key = hash( text );
105	current_ptr = reserved[key];
106
107	// walk through possible mutiple entries
108
109	while( current_ptr != NULL ){
110
111	matched = !strcmp( text, current_ptr->word );
112	if( matched ) return current_ptr->token; // search successful
113
114	current_ptr = current_ptr->next;
115	}
116
117	// if no keywords turn up, check the word against the list of defines
118
119	if( defined_list != NULL ){
120	def_ptr = defined_list[key];
121
122	while( def_ptr != NULL ){
123
124	matched = !strcmp( text, def_ptr->defined );
125	if( matched ) return DEFINED;
126
127	def_ptr = def_ptr->next;
128	}
129	}
130
131	return 0; //search failed
132	}
133
134	/*
135	* This is used to test whether a given word is defined
136	* returns 1 if true, 0 if False.
137	*/
138
139	int is_defined( char* text ){
140
141	int matched = 0;
142	int key;
143	struct defined_element* def_ptr; // points to the current define element
144
145	key = hash( text );
146
147	if( defined_list != NULL ){
148	def_ptr = defined_list[key];
149
150	while( def_ptr != NULL ){
151
152	matched = !strcmp( text, def_ptr->defined );
153	if( matched ) return 1; // search succesful
154
155	def_ptr = def_ptr->next;
156	}
157	}
158
159	return 0; //search failed
160	}
161
162	/*
163	* The next bit returns the text to substitute for any given define.
164	*/
165
166	char* get_definition( char* defined ){
167	int key;
168	int matched = 0;
169	struct defined_element* def_ptr;
170
171	if( defined_list != NULL ){
172
173	key = hash( defined );
174	def_ptr = defined_list[key];
175
176	while( def_ptr != NULL ){
177
178	matched = !strcmp( defined, def_ptr->defined );
179	if( matched ) return def_ptr->definition;
180
181	def_ptr = def_ptr->next;
182	}
183	}
184
185	// search failed, therefore there is an error
186
187	fprintf( stderr, "%s was not found in the defined list\n", defined );
188	#ifdef IS_MPI
189	mpiInterfaceExit();
190	#endif
191	exit(0);
192	return NULL;
193	}
194
195	/*
196	* Add a define statement to the hash table
197	*/
198
199	void insert_define( char* defined, char* definition ){
200
201	int i, key;
202	struct defined_element* element;
203
204	if( defined_list == NULL ){
205
206	defined_list = ( struct defined_element** )
207	calloc( HASH_SIZE, sizeof( struct defined_element* ) );
208
209	for( i=0; i<HASH_SIZE; i++ ){
210
211	defined_list[i] = NULL;
212	}
213	}
214
215	key = hash( defined );
216	element = (struct defined_element* )
217	malloc( sizeof( struct defined_element ) );
218
219	// fill the element
220
221	strcpy( element->defined, defined );
222	strcpy( element->definition, definition );
223
224	// add the element to the table
225
226	element->next = defined_list[key];
227	defined_list[key] = element;
228	}
229
230	/*
231	* adds an element to the hash table
232	*/
233
234	void add_res_element( char* text, int the_token ){
235
236	int key; // the calculated hash key;
237	struct res_element* element; // the element being added
238
239	key = hash( text );
240	element = (struct res_element *) malloc( sizeof( struct res_element ) );
241
242	// fill the element
243
244	strcpy( element->word, text );
245	element->token = the_token;
246
247	// add the element to the table
248
249	element->next = reserved[key];
250	reserved[key] = element;
251	}
252
253	/*
254	generartes the hash key from the given word.
255	*/
256
257	int hash ( char* text ){
258
259	register unsigned short int i = 0; // loop counter
260	int key = 0; // the hash key
261
262	while( text[i] != '\0' ){
263
264	key = ( ( key << SHIFT ) + text[i] ) % HASH_SIZE;
265
266	i++;
267	}
268
269	if( key < 0 ){
270
271	// if the key is less than zero, we've had an overflow error
272
273	fprintf( stderr,
274	"There has been an overflow error in the hash key.");
275	#ifdef IS_MPI
276	mpiInterfaceExit();
277	#endif
278	exit(0);
279	}
280
281	return key;
282	}
283
284	/*
285	function to clean up the memory after we are finished with the lists
286	*/
287
288	void kill_lists( ){
289
290	struct res_element* current_res_ptr;
291	struct res_element* temp_res_ptr;
292
293	struct defined_element* current_def_ptr;
294	struct defined_element* temp_def_ptr;
295
296	register unsigned short int i;
297
298	if( reserved != NULL ){
299
300	for( i=0; i < HASH_SIZE; i++){
301
302	current_res_ptr = reserved[i];
303
304	while( current_res_ptr != NULL ){
305
306	temp_res_ptr = current_res_ptr->next;
307	free( current_res_ptr );
308	current_res_ptr = temp_res_ptr;
309	}
310	}
311
312	free( reserved );
313	}
314
315	if( defined_list != NULL ){
316
317	for( i=0; i < HASH_SIZE; i++){
318
319	current_def_ptr = defined_list[i];
320
321	while( current_def_ptr != NULL ){
322
323	temp_def_ptr = current_def_ptr->next;
324	free( current_def_ptr );
325	current_def_ptr = temp_def_ptr;
326	}
327	}
328
329	free( defined_list );
330	}
331
332	reserved = NULL;
333	defined_list = NULL;
334
335	is_initialized = 0; // initialization is now false
336	}