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#include <stdlib.h>
#include <string.h>
#include "../io/error.h"
#include "knowledge.h"
/** Functions to assimilate sentences using a ZoO_knowledge structure *********/
static int link_to
(
ZoO_index links_count [const restrict static 1],
ZoO_index * links_occurrences [const restrict static 1],
ZoO_index * links [const restrict static 1],
ZoO_index const target
)
{
ZoO_index i, * new_p;
for (i = 0; i < *links_count; ++i)
{
if ((*links)[i] == target)
{
if ((*links_occurrences)[i] == ZoO_INDEX_MAX)
{
ZoO_S_WARNING
(
"Maximum link occurrences count has been reached."
);
return -1;
}
(*links_occurrences)[i] += 1;
return 0;
}
}
if (*links_count == ZoO_INDEX_MAX)
{
ZoO_S_WARNING("Maximum links count has been reached.");
return -1;
}
new_p =
(ZoO_index *) realloc
(
*links_occurrences,
(
(
/* Safe: *links_count < ZoO_INDEX_MAX */
(size_t) (*links_count + 1)
)
* sizeof(ZoO_index)
)
);
if (new_p == (ZoO_index *) NULL)
{
ZoO_S_ERROR("Could not reallocate a link occurrences list.");
return -1;
}
new_p[*links_count] = 1;
*links_occurrences = new_p;
new_p =
(ZoO_index *) realloc
(
*links,
(
(
/* Safe: *links_count < ZoO_INDEX_MAX */
(size_t) (*links_count + 1)
) * sizeof(ZoO_index)
)
);
if (new_p == (ZoO_index *) NULL)
{
ZoO_S_ERROR("Could not reallocate a link list.");
return -1;
}
new_p[*links_count] = target;
*links = new_p;
*links_count += 1;
return 0;
}
static int link_words
(
struct ZoO_knowledge k [const restrict static 1],
ZoO_index const a,
ZoO_index const b
)
{
int error;
error =
link_to
(
&(k->words[a].forward_links_count),
&(k->words[a].forward_links_occurrences),
&(k->words[a].forward_links),
b
);
error =
(
link_to
(
&(k->words[b].backward_links_count),
&(k->words[b].backward_links_occurrences),
&(k->words[b].backward_links),
a
)
| error
);
return error;
}
int ZoO_knowledge_assimilate
(
struct ZoO_knowledge k [const static 1],
struct ZoO_strings string [const restrict static 1],
ZoO_index const aliases_count,
const char * restrict aliases [const restrict static aliases_count]
)
{
int error;
ZoO_index curr_word, next_word;
ZoO_index curr_word_id, next_word_id;
curr_word = 0;
if (string->words_count == 0)
{
return 0;
}
for (curr_word = 0; curr_word < aliases_count; ++curr_word)
{
if (ZoO_IS_PREFIX(aliases[curr_word], string->words[0]))
{
return 0;
}
}
curr_word = 0;
if (ZoO_knowledge_learn(k, string->words[curr_word], &curr_word_id) < 0)
{
return -1;
}
if (link_words(k, ZoO_WORD_START_OF_LINE, curr_word_id) < 0)
{
error = -1;
ZoO_WARNING
(
"Could not indicate that '"
ZoO_CHAR_STRING_SYMBOL
"' was the first word of the sentence.",
string->words[0]
);
}
next_word = 1;
error = 0;
while (next_word < string->words_count)
{
/* prevents words [restrict], k [restrict] */
if (ZoO_knowledge_learn(k, string->words[next_word], &next_word_id) < 0)
{
return -1;
}
if (link_words(k, curr_word_id, next_word_id) < 0)
{
error = -1;
ZoO_WARNING
(
"Could not add a link between words '"
ZoO_CHAR_STRING_SYMBOL
"' and '"
ZoO_CHAR_STRING_SYMBOL
"'.",
string->words[curr_word],
string->words[next_word]
);
}
curr_word = next_word;
curr_word_id = next_word_id;
/*
* Safe:
* - next_word < words_count
* - words_count =< ZoO_INDEX_MAX
* ----
* next_word < ZoO_INDEX_MAX
*/
next_word += 1;
}
if (link_words(k, curr_word_id, ZoO_WORD_END_OF_LINE) < 0)
{
error = -1;
ZoO_WARNING
(
"Could not indicate that '"
ZoO_CHAR_STRING_SYMBOL
"' was the last word of the sentence.",
string->words[curr_word_id]
);
}
return error;
}
|
