/PROJECTS_ROOT/SmartWires/SystemUtils/myspell/mythes.cxx

#include "license.readme"

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <errno.h>



#include "mythes.hxx"







MyThes::MyThes(const char* idxpath, const char * datpath)

{

    nw = 0;

    encoding = NULL;

    list = NULL;

    offst = NULL;



    if (thInitialize(idxpath, datpath) != 1) {

        fprintf(stderr,"Error - can't open %s or %s\n",idxpath, datpath);

        fflush(stderr);

        if (encoding) free((void*)encoding);

        if (list)  free((void*)list);

        if (offst) free((void*)offst);

        // did not initialize properly - throw exception?

    }

}





MyThes::~MyThes()

{

    if (thCleanup() != 1) {

        /* did not cleanup properly - throw exception? */

    }

    if (encoding) free((void*)encoding);

    encoding = NULL;

    list = NULL;

    offst = NULL;

}





int MyThes::thInitialize(const char* idxpath, const char* datpath)

{



    // open the index file

    FILE * pifile = fopen(idxpath,"r");

    if (!pifile) {

        pifile = NULL;

        return 0;

    } 



    // parse in encoding and index size */    

    char * wrd;

    wrd = (char *)calloc(1, MAX_WD_LEN);

    int len = readLine(pifile,wrd,MAX_WD_LEN);

    encoding = mystrdup(wrd);

    len = readLine(pifile,wrd,MAX_WD_LEN);

    int idxsz = atoi(wrd); 

    



    // now allocate list, offst for the given size

    list = (char**)   calloc(idxsz,sizeof(char*));

    offst = (unsigned int*) calloc(idxsz,sizeof(unsigned int));



    if ( (!(list)) || (!(offst)) ) {

       fprintf(stderr,"Error - bad memory allocation\n");

       fflush(stderr);

       return 0;

    }



    // now parse the remaining lines of the index

    len = readLine(pifile,wrd,MAX_WD_LEN);

    while (len > 0)

    { 

        int np = mystr_indexOfChar(wrd,'|');

        if (nw < idxsz) {

           if (np >= 0) {          

              *(wrd+np) = '\0';

              list[nw] = (char *)calloc(1,(np+1));

              memcpy((list[nw]),wrd,np);

              offst[nw] = atoi(wrd+np+1);

              nw++;

	   }

        }

        len = readLine(pifile,wrd,MAX_WD_LEN);

    }



    free((void *)wrd);

    fclose(pifile);

    pifile=NULL;



    /* next open the data file */

    pdfile = fopen(datpath,"r");

    if (!pdfile) {

        pdfile = NULL;

        return 0;

    } 

        

    return 1;        

}





int MyThes::thCleanup()

{

    /* first close the data file */

    if (pdfile) {

        fclose(pdfile);

        pdfile=NULL;

    }



    /* now free up all the allocated strings on the list */

    for (int i=0; i < nw; i++) 

    {

        if (list[i]) {

            free(list[i]);

            list[i] = 0;

        }

    }



    if (list)  free((void*)list);

    if (offst) free((void*)offst);



    nw = 0;

    return 1;

}







// lookup text in index and count of meanings and a list of meaning entries

// with each entry having a synonym count and pointer to an 

// array of char * (i.e the synonyms)

// 

// note: calling routine should call CleanUpAfterLookup with the original

// meaning point and count to properly deallocate memory



int MyThes::Lookup(const char * pText, int len, mentry** pme)

{ 



    *pme = NULL;



    // handle the case of missing file or file related errors

    if (! pdfile) return 0;



    long offset = 0;



    /* copy search word and make sure null terminated */

    char * wrd = (char *) calloc(1,(len+1));

    memcpy(wrd,pText,len);

  

    /* find it in the list */

    int idx = binsearch(wrd,list,nw);

    free(wrd);  

    if (idx < 0) return 0;



    // now seek to the offset

    offset = (long) offst[idx];

    int rc = fseek(pdfile,offset,SEEK_SET);

    if (rc) {

       return 0;

    }



    // grab the count of the number of meanings

    // and allocate a list of meaning entries

    char * buf = NULL;

    buf  = (char *) malloc( MAX_LN_LEN );

    if (!buf) return 0;

    readLine(pdfile, buf, (MAX_LN_LEN-1));

    int np = mystr_indexOfChar(buf,'|');

    if (np < 0) {

         free(buf);

         return 0;

    }          

    int nmeanings = atoi(buf+np+1);

    *pme = (mentry*) malloc( nmeanings * sizeof(mentry) );

    if (!(*pme)) {

        free(buf);

        return 0;

    }



    // now read in each meaning and parse it to get defn, count and synonym lists

    mentry* pm = *(pme);

    char dfn[MAX_WD_LEN];



    for (int j = 0; j < nmeanings; j++) {

        readLine(pdfile, buf, (MAX_LN_LEN-1));



        pm->count = 0;

        pm->psyns = NULL;

        pm->defn = NULL;



        // store away the part of speech for later use

        char * p = buf;

        char * pos = NULL;

        np = mystr_indexOfChar(p,'|');

        if (np >= 0) {

           *(buf+np) = '\0';

	   pos = mystrdup(p);

           p = p + np + 1;

	} else {

          pos = mystrdup("");

        }

        

        // count the number of fields in the remaining line

        int nf = 1;

        char * d = p;

        np = mystr_indexOfChar(d,'|');        

        while ( np >= 0 ) {

	  nf++;

          d = d + np + 1;

          np = mystr_indexOfChar(d,'|');          

	}

	pm->count = nf;

        pm->psyns = (char **) malloc(nf*sizeof(char*)); 

        

        // fill in the synonym list

        d = p;

        for (int j = 0; j < nf; j++) {

            np = mystr_indexOfChar(d,'|');

            if (np > 0) {

	      *(d+np) = '\0';

              pm->psyns[j] = mystrdup(d);

              d = d + np + 1;

            } else {

              pm->psyns[j] = mystrdup(d);

	    }            

        }



        // add pos to first synonym to create the definition

        int k = strlen(pos);

        int m = strlen(pm->psyns[0]);

        if ((k+m) < (MAX_WD_LEN - 1)) {

             strncpy(dfn,pos,k);

             *(dfn+k) = ' ';

             strncpy((dfn+k+1),(pm->psyns[0]),m+1);

             pm->defn = mystrdup(dfn);

	} else {

	     pm->defn = mystrdup(pm->psyns[0]);

	}

        free(pos);

        pm++;



    }

    free(buf);

   

    return nmeanings;

} 







void MyThes::CleanUpAfterLookup(mentry ** pme, int nmeanings)

{ 



    if (nmeanings == 0) return;

    if ((*pme) == NULL) return;



    mentry * pm = *pme;

       

    for (int i = 0; i < nmeanings; i++) {

       int count = pm->count;

       for (int j = 0; j < count; j++) {

	  if (pm->psyns[j]) free(pm->psyns[j]);

          pm->psyns[j] = NULL;

       }

       if (pm->psyns) free(pm->psyns);

       pm->psyns = NULL;

       if (pm->defn) free(pm->defn);

       pm->defn = NULL;

       pm->count = 0;

       pm++;

    }

    pm = *pme;

    free(pm);

    *pme = NULL;

    return;

}





// read a line of text from a text file stripping

// off the line terminator and replacing it with

// a null string terminator.

// returns:  -1 on error or the number of characters in

//             in the returning string



// A maximum of nc characters will be returned



int MyThes::readLine(FILE * pf, char * buf, int nc)

{

    

  if (fgets(buf,nc,pf)) {

    mychomp(buf);

    return strlen(buf);

  }

  return -1;

}





 

//  performs a binary search on null terminated character

//  strings

//

//  returns: -1 on not found

//           index of wrd in the list[]



int MyThes::binsearch(char * sw, char* list[], int nlst) 

{

    int lp, up, mp, j, indx;

    lp = 0;

    up = nlst-1;

    indx = -1;

    if (strcmp(sw,list[lp]) < 0) return -1;

    if (strcmp(sw,list[up]) > 0) return -1;

    while (indx < 0 ) {

        mp = (int)((lp+up) >> 1);

        j = strcmp(sw,list[mp]);

        if ( j > 0) {

            lp = mp + 1;

        } else if (j < 0 ) {

            up = mp - 1;

        } else {

            indx = mp;

        }

        if (lp > up) return -1;      

    }

    return indx;

}



char * MyThes::get_th_encoding()

{

  if (encoding) return encoding;

  return NULL;

}





// string duplication routine

char * MyThes::mystrdup(const char * p)

{

  int sl = strlen(p) + 1;

  char * d = (char *)malloc(sl);

  if (d) {

    memcpy(d,p,sl);

    return d;

  }

  return NULL;

}



// remove cross-platform text line end characters

void MyThes::mychomp(char * s)

{

  int k = strlen(s);

  if ((k > 0) && ((*(s+k-1)=='\r') || (*(s+k-1)=='\n'))) *(s+k-1) = '\0';

  if ((k > 1) && (*(s+k-2) == '\r')) *(s+k-2) = '\0';

}





// return index of char in string

int MyThes::mystr_indexOfChar(const char * d, int c)

{

  char * p = strchr((char *)d,c);

  if (p) return (int)(p-d);

  return -1;

}