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/*    Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

unsigned char t_buf[4][MAX_LINELEN+1];

char maskbuf[MAX_LINELEN+1];

        /* internal routine. */

void _text_cut(char *p, char *w)

{

    char *p1, *p2;

    p1=wordchr(p,w); if(p1==NULL) error2("syntax_error");

    *p1=0; p2=find_word_start(p1+strlen(w));

    strcpy(t_buf[0],p); strcpy(t_buf[1],p2);

    strip_trailing_spaces(t_buf[0]);

    substitute(t_buf[0]); substitute(t_buf[1]);

}

        /* Extract characters in buf[0] which are identical to

         * corresponding characters in buf[1]. */

void text_common(char *p)

{

    int i,j,n1,n2;

    _text_cut(p,"and");

    n1=strlen(t_buf[0]);n2=strlen(t_buf[1]);

    if(n2<n1) n1=n2;

    for(i=j=0;i<n1;i++) {

        if(t_buf[0][i]==t_buf[1][i] && maskbuf[i]!='0') p[j++]=t_buf[0][i];

    }

    p[j]=0;

}

        /* Returns a mask string composed of '0's and '1's, where

         * '0' means corresponding positions of buf[0] and buf[1] are

         * equal. */

void text_compare(char *p)

{

    int min,max, i;

    _text_cut(p,"and");

    min=strlen(t_buf[0]); max=strlen(t_buf[1]);

    if(min>max) {

        i=min; min=max; max=i;

    }

    for(i=0; i<min; i++) {

        if(t_buf[0][i]==t_buf[1][i]) p[i]='0'; else p[i]='1';

    }

    for(; i<max; i++) p[i]='1';

    p[max]=0;

}

        /* copy text according to mask. */

void text_copy(char *p)

{

    int i, j, n;

    snprintf(t_buf[0],MAX_LINELEN,"%s",p);

    strip_trailing_spaces(t_buf[0]); substitute(t_buf[0]);

    n=strlen(t_buf[0]);

    for(i=j=0;i<n;i++) {

        if(maskbuf[i]!='0') p[j++]=t_buf[0][i];

    }

    p[j]=0;

}

        /* returns count of characters in buf[1] which appear in buf[0]. */

void text_count(char *p)

{

    int i, n, c;

    _text_cut(p,"in");

    n=strlen(t_buf[1]);

    for(i=c=0;i<n;i++) {

        if(strchr(t_buf[0],t_buf[1][i])!=NULL && maskbuf[i]!='0') c++;

    }

    snprintf(p,MAX_LINELEN,"%d",c);

}

        /* Extract characters in buf[0] which are different than

         * corresponding characters in buf[1]. */

void text_diff(char *p)

{

    int i,j,n1,n2;

    _text_cut(p,"from");

    n1=strlen(t_buf[0]);n2=strlen(t_buf[1]);

    if(n2<n1) n1=n2;

    for(i=j=0;i<n1;i++) {

        if(t_buf[0][i]!=t_buf[1][i] && maskbuf[i]!='0') p[j++]=t_buf[0][i];

    }

    p[j]=0;

}

        /* put chars in buf[0] in a new string, into positions

         * corresponding to '1's in the mask buf[1].

         * Positions corresponding to '0's are filled by space.

         * Fill stops at the end of buf[0]. If buf[1] is

         * too short, it is reused from the start. */

void text_expand(char *p)

{

    int i,j,k,n1,n2;

    _text_cut(p,"using");

    n1=strlen(t_buf[0]);n2=strlen(t_buf[1]);

    if(n2==0) {p[0]=0; return;}

    for(i=j=k=0;i<n1 && j<MAX_LINELEN;j++,k=j%n2) {

        if(t_buf[1][k]=='0') p[j]=' ';

        else p[j]=t_buf[0][i++];

    }

    p[j]=0;

}

        /* character by character replacement of buf[1] by buf[0],

         * replacing only mask-effective chars.

         * The resulting string is as long as buf[1], and the replacement

         * stops when chars buf[0] has run out. */

void text_insert(char *p)

{

    int i,j,n1,n2;

    _text_cut(p,"into");

    n1=strlen(t_buf[0]);n2=strlen(t_buf[1]);

    for(i=j=0; i<n2 && j<n1; i++) {

        if(maskbuf[i]!='0') t_buf[1][i]=t_buf[0][j++];

    }

    snprintf(p,MAX_LINELEN,"%s",t_buf[1]);

}

#define MAX_TLEN 96

        /* interact of two strings according to rules

         * defined a table. */

void text_interact(char *p)

{

    char *table, *dline, *tline[MAX_TLEN];

    char *p1, *p2;

    int i,j1,j2,k,l,l2,n;

    table=wordchr(p,"table");

    if(table==NULL) error2("syntax_error");

    *table=0; strip_trailing_spaces(p);

    table=find_word_start(table+strlen("table"));

    snprintf(t_buf[2],MAX_LINELEN,"%s",table);

    _text_cut(p,"and");

    strip_trailing_spaces(t_buf[2]); substitute(t_buf[2]);

    n=linenum(t_buf[2])-1;

    if(n>=MAX_TLEN) error2("text_bad_table");

    p2=strchr(t_buf[2],'\n'); if(p2!=NULL) *p2++=0;

    if(strlen(t_buf[2])!=n) error2("text_bad_table");

    dline=t_buf[2];

    for(i=0,p1=p2;i<n;i++,p1=p2) {

        if(p1==NULL) error2("text_bad_table");

        p2=strchr(p1,'\n');

        if(p2!=NULL) *p2++=0;

        if(strlen(p1)!=n) error2("text_bad_table");

        tline[i]=p1;

    }

    l=strlen(t_buf[0]); l2=strlen(t_buf[1]); if(l2<l) l=l2;

    for(i=k=0;i<l;i++) {

        if(maskbuf[i]!='0') {

            p1=strchr(dline,t_buf[0][i]);

            p2=strchr(dline,t_buf[1][i]);

            if(p1==NULL || p2==NULL) continue;

            j1=p1-dline; j2=p2-dline;

            if(j1>=n || j2>=n) continue; /* should not occur */

            p[k++]=tline[j1][j2];

        }

    }

    p[k]=0;

}

        /* returns a mask string composed of '0's and '1's, where

         * '0' means corresponding char in buf[1] appears in buf[0]. */

void text_mark(char *p)

{

    int i, n;

    _text_cut(p,"in");

    n=strlen(t_buf[1]);

    for(i=0;i<n;i++) {

        if(strchr(t_buf[0],t_buf[1][i])!=NULL) p[i]='1';

        else p[i]='0';

    }

    p[i]=0;

}

        /* Returns a string whose characters are the maximum

         * of the two corresponding chars in buf[0] and buf[1].

         * Length of the string is the longuest one. */

void text_max(char *p)

{

    int min,max, i, j, k;

    _text_cut(p,"and");

    min=strlen(t_buf[0]); max=strlen(t_buf[1]);

    if(min>max) {

        i=min; min=max; max=i; j=0;

    }

    else j=1;

    for(i=k=0; i<min; i++) {

        if(maskbuf[i]=='0') continue;

        if(t_buf[0][i]>t_buf[1][i]) p[k++]=t_buf[0][i];

        else p[k++]=t_buf[1][i];

    }

    for(;i<max;i++) {

        if(maskbuf[i]!='0') p[k++]=t_buf[j][i];

    }

    p[k]=0;

}

        /* Returns a string whose characters are the minimum

         * of the two corresponding chars in buf[0] and buf[1].

         * Length of the string is the shortest one. */

void text_min(char *p)

{

    int min,max, i,k;

    _text_cut(p,"and");

    min=strlen(t_buf[0]); max=strlen(t_buf[1]);

    if(min>max) {

        i=min; min=max; max=i;

    }

    for(i=k=0; i<min; i++) {

        if(maskbuf[i]=='0') continue;

        if(t_buf[0][i]<t_buf[1][i]) p[k++]=t_buf[0][i];

        else p[k++]=t_buf[1][i];

    }

    p[k]=0;

}

        /* extract chars in buf[0] which occur in buf[1]. */

void text_occur(char *p)

{

    int i,j,n;

    unsigned char *pp;

    char buf[MAX_LINELEN+1];

    memset(buf,0,sizeof(buf));

    _text_cut(p,"in");

    n=strlen(t_buf[1]);

    for(i=0;i<n;i++) {

        if(maskbuf[i]=='0') continue;

        pp=strchr(t_buf[0],t_buf[1][i]);

        if(pp!=NULL) buf[pp - t_buf[0]]=1;

    }

    n=strlen(t_buf[0]);

    for(i=j=0;i<n;i++) {

        if(buf[i]) p[j++]=t_buf[0][i];

    }

    p[j]=0;

}

        /* remove characters of buf[1] in buf[0]. */

void text_remove(char *p)

{

    int i, j, n;

    _text_cut(p,"in");

    n=strlen(t_buf[1]);

    for(i=j=0;i<n;i++) {

        if(strchr(t_buf[0],t_buf[1][i])==NULL

           && maskbuf[i]!='0') p[j++]=t_buf[1][i];

    }

    p[j]=0;

}

        /* Cyclic reordering of text. */

void text_reorder(char *p)

{

    int i,j,k,l,n,t;

    int list[10240];

    char buf[MAX_LINELEN+1];

    _text_cut(p,"by"); *p=0;

    n=itemnum(t_buf[1]); if(n<=0 || n>=10240) return;

    for(i=0;i<n;i++) {

        buf[0]=0; fnd_item(t_buf[1],i+1,buf);

        j=atoi(buf); if(j<=0 || j>n) return;

        list[i]=j;

    }

    t=strlen(t_buf[0]);

    for(i=l=0;l<t && i<t+n;i++) {

        j=i/n; k=j*n+list[i%n];

        if(k>t || k<=0) continue;

        p[l++]=t_buf[0][k-1];

    }

    p[l]=0;

}

        /* repeat a string to a given length. */

void text_repeat(char *p)

{

    int n,i,k;

    _text_cut(p,"to");

    n=strevalue(t_buf[1]); if(n>MAX_LINELEN) n=MAX_LINELEN;

    if(n<0) n=0;

    k=strlen(t_buf[0]); if(k<=0) {*p=0; return;}

    for(i=0;i<n;i++) {

        p[i]=t_buf[0][i%k];

    }

    p[i]=0;

}

        /* reverse a string */

void text_reverse(char *p)

{

    int i,n;

    char buf[MAX_LINELEN+1];

    snprintf(t_buf[0],sizeof(t_buf[0]),"%s",p);

    substitute(t_buf[0]);

    n=strlen(t_buf[0]); if(n>MAX_LINELEN) n=MAX_LINELEN;

    for(i=0;i<n;i++) buf[i]=t_buf[0][n-1-i];

    buf[n]=0;

    strcpy(p,buf);

}

        /* remove characters of buf[1] not in buf[0]. */

void text_select(char *p)

{

    int i, j, n;

    _text_cut(p,"in");

    n=strlen(t_buf[1]);

    for(i=j=0;i<n;i++) {

        if(strchr(t_buf[0],t_buf[1][i])!=NULL

           && maskbuf[i]!='0') p[j++]=t_buf[1][i];

    }

    p[j]=0;

}

        /* tag: bit 0 is mask. */

struct {

    char *name;

    int tag;

    void (*routine) (char *p);

} text_proc[]={

      {"appear",        1,      text_occur},

      {"common",        1,      text_common},

      {"compare",       0,      text_compare},

      {"copy",          1,      text_copy},

      {"count",         1,      text_count},

      {"delete",        1,      text_remove},

      {"diff",          1,      text_diff},

      {"differ",        1,      text_diff},

      {"drop",          1,      text_remove},

      {"expand",        0,      text_expand},

      {"extract",       1,      text_select},

      {"insert",        1,      text_insert},

      {"interact",      1,      text_interact},

      {"mark",          0,      text_mark},

      {"max",           1,      text_max},

      {"min",           1,      text_min},

      {"occur",         1,      text_occur},

      {"occurrence",    1,      text_occur},

      {"pick",          1,      text_select},

      {"pickup",        1,      text_select},

      {"remove",        1,      text_remove},

      {"reorder",       0,      text_reorder},

      {"repeat",        0,      text_repeat},

      {"reverse",       0,      text_reverse},

      {"select",        1,      text_select}

};

#define TEXT_PROC_NO (sizeof(text_proc)/sizeof(text_proc[0]))

int textab_verify(void) {

    return verify_order(text_proc,TEXT_PROC_NO,sizeof(text_proc[0]));

}

        /* main entry point for text routines */

void text(char *p)

{

    int i,j,n;

    char *p1, *p2;

    char c,cc;

    char buf[MAX_LINELEN+1];

    p1=find_word_start(p); p2=find_word_end(p1);

    if(p2<=p1 || *p2==0) error2("syntax_error");

    *p2=0;

    i=search_list(text_proc,TEXT_PROC_NO,sizeof(text_proc[0]),p1);

    if(i<0) error2("syntax_error");

    snprintf(buf,sizeof(buf),"%s",find_word_start(p2+1));

    if((text_proc[i].tag&1)!=0 && (p1=wordchr(buf,"mask"))!=NULL) {

        *p1=0; strip_trailing_spaces(buf);

        p2=find_word_start(p1+strlen("mask"));

        strip_trailing_spaces(p2);

        snprintf(maskbuf,sizeof(maskbuf),"%s",p2);

        substitute(maskbuf);

        n=strlen(maskbuf); if(n==0) goto zeromask;

        c=maskbuf[n-1]; cc=0;

        if(c=='+') cc='1'; if(c=='-') cc='0';

        if(cc!=0) memset(maskbuf+n-1,cc,sizeof(maskbuf)-n);

        else for(j=n;j<MAX_LINELEN;j++) maskbuf[j]=maskbuf[j%n];

        maskbuf[sizeof(maskbuf)-1]=0;

    }

    else zeromask: memset(maskbuf,0,sizeof(maskbuf));

    text_proc[i].routine(buf);

    buf[MAX_LINELEN]=0;strcpy(p,buf);

}