/* This is the main file for hacking dvips to do HyperPostScript
 * Written by Mark D. Doyle 11/94. It is (C) Copyright 1994 by Mark D. Doyle
 * and the University of California. You may modify and use this program to
 * your heart's content, so long as you send modifications to Mark Doyle and
 * abide by the rest of the dvips copyrights. 
 */
#include "dvips.h"
#ifdef HPS
#include <stdlib.h>
#ifdef KPATHSEA
#include <kpathsea/c-ctype.h>
#else
#define TOLOWER Tolower
#endif
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
#ifndef Tolower
#define Tolower tolower
#endif
#define NAME 0
#define HREF 1
#define skip_space(s) for( ; *s == ' ' ; s++) ;

Boolean inHTMLregion = 0 ;
Boolean NO_ERROR = 1 ;
Boolean HPS_ERROR = 0 ;
integer HREF_COUNT ;  
Boolean ISHREF = 0 ;
Boolean POPPED = 0 ;
Boolean PUSHED = 0 ;

char *current_name ;
int current_type ;
int current_pushcount ;
extern integer pushcount ;


#define GoTo 0
#define GoToR 1
#define Launch 2

typedef struct rectangle {
  double llx ; /* lower left x coor */
  double lly ; /* lower left y coor */
  double urx ; /* upper right x coor */
  double ury ; /* upper right y coor */
  } dvipsRectangle ; 

typedef struct hps_link {
  int action ; /* GoTo, GoToR, or Launch */
  char *file ;   /* PDF-style system-independent filename - unused now */
  dvipsRectangle rect ;  /* rectangle for location of link */
  int border[5] ; /* Border info --- with dashes*/
  int srcpg ; /* Page of location */
  int page ;  /* Page of destination --- left out is same as srcpg */
  int vert_dest ; /* Vertical position of destination on page */
  double color[3] ; /* color: length of array gives colorspace (3 <=> RGB)*/
  char *title ; /* Title of link */
  } Hps_link ;

struct nlist { /* hashtable entry */
  struct nlist *next ; /* next entry in chain */
  char *name ; /* defined name */
  Hps_link *defn ; /* Link associated with name */
  } ;

typedef struct rect_list { /* linked list of rectangles */
  struct rect_list *next ; /* next rectangle in the chain */
  dvipsRectangle rect ;
  } Rect_list ;

Rect_list *current_rect_list ;

#define HASHSIZE 1223 
static struct nlist *link_targets[HASHSIZE] ; /* names .... */
static struct nlist *link_sources[HASHSIZE] ; /* hrefs .... */

#ifdef KPATHSEA
#define dup_str xstrdup
#else
char *dup_str() ; /* duplicate a string */
#endif

#include "protos.h"

extern Boolean removecomments ;
Boolean noprocset ; /* Leave out BeginProc and EndProc comments */
extern int vactualdpi ; 
extern int pagecounter ;
extern integer hhmem, vvmem ;
extern integer vpapersize ;
/* This was hardcoded to letter size.  The denominator converts scaled
   points to big points (65536*72.27/72). */
#undef PAGESIZE /* HP-UX 10 defines for itself.  */
#define PAGESIZE ((int) (vpapersize/65781.76))
#define MARGIN 72
#define VERTICAL 0
#define HORIZONTAL 1
#define FUDGE 2.0

/* For later use 
* static char *dest_key[9] = {"Fit", "FitB", "FitW", "FitH", "FitBH"
               "FitR", "FitV", "FitBV", "XYZ"} ; 
*/

extern FILE *bitfile  ; 
extern char *oname  ; 

extern integer pagenum ;
extern integer hh ;
extern integer vv ;
extern integer hoff, voff ;

char *hs = NULL ; /* html string to be handled */
char *url_name = NULL ; /* url between double quotes */

/* parse anchor into link */
void do_html P1C(char *, s)
{
  Hps_link *nl ;
  url_name = (char *)malloc(strlen(s)+1) ;
  hs = s ;
  HREF_COUNT = 0 ; 
  skip_space(hs) ; /* skip spaces */
  if ( TOLOWER(*hs) == 'a') { /* valid start */
    POPPED = FALSE ;
    if (inHTMLregion) {
      error("previous html not closed with /A");
      return;
    } else {
      inHTMLregion = TRUE ;
      current_rect_list = NULL ;
    }
    hs++ ;
    skip_space(hs) ;
    while(*hs != '\0') {
      /* parse for names and href */
      if (!href_or_name()) { 
	error("Bad HMTL:") ;
	error(s) ;
	error("!") ;
	break ;
      }
      skip_space(hs) ;
    }
  } else if ( (*hs == '/') && (TOLOWER(hs[1]) == 'a') ) {
    if (!inHTMLregion) {
      error("In html, /A found without previous A") ;
      return;
    } else {
      inHTMLregion = FALSE ;
    }
       if (current_type == HREF && current_name[0] != '#') {
	 if ((nl = lookup_link(current_name, current_type)->defn)) { 
	   nl->rect.urx = dvi_to_hps_conv(hh + hoff,HORIZONTAL) ;
	   nl->rect.ury = dvi_to_hps_conv(vv + voff, VERTICAL)-FUDGE+12.0 ; 
	   stamp_external(current_name,nl); /* Broken lines ? */
	 } else {
	   error("!Null lookup");
	 }
       } else {
	 if ((nl = lookup_link(current_name, current_type)->defn)) { 
	   nl->rect.urx = dvi_to_hps_conv(hh + hoff,HORIZONTAL) ;
	   nl->rect.ury = dvi_to_hps_conv(vv + voff, VERTICAL)-FUDGE+12.0 ; 
	   if (current_type) {
	     stamp_hps(nl) ; /* Put link info right where special is */
	     print_rect_list() ; /* print out rectangles */
	   }
	 } else {
                    error("!Null lookup");
	 }
       } 
  }
  else {
    error( "No A in html special") ;
    error(s) ;
    /*error("!") ;*/
  }
  
  return ;
}

int href_or_name P1H(void) {
  if ((strncmp(hs, "href", 4) == 0) || (strncmp(hs, "HREF", 4) == 0)) {
    ISHREF = TRUE ;
  } else if ((strncmp(hs, "name", 4) == 0) 
	     || (strncmp(hs, "NAME", 4) == 0)) {
    ISHREF = FALSE ; 
  } else {
    error("Not valid href or name html reference") ;
    return(HPS_ERROR) ;
          }
  if(!parseref()) return(HPS_ERROR) ;
  if (url_name) {
    if( ISHREF ) {
      do_link(url_name, HREF) ;
    } else do_link(url_name, NAME) ;
  } else {
    error("No string in qoutes ") ;
    return(HPS_ERROR) ;
  }
  return(NO_ERROR) ;
}

int parseref P1H(void) {
  int i = 0 ;
  for(i=0 ; i++ < 4 ; hs++) ; /* skip href or name in html string */
  skip_space(hs) ;
  if (*hs == '=' ) {
    hs++ ;
  } else {
    error("No equal sign") ;
    return(HPS_ERROR) ;
  }
  if(!get_string()) return(HPS_ERROR) ;
  return(NO_ERROR) ; /* extract stuff between double quotes */
}
        
int get_string P1H(void) {
  char *v = url_name ; 
  
  skip_space(hs) ;
  /* hash_name() ; */
  if (*hs == '"') {
    for(hs++ ; *hs != '"' && *hs != '\0' ; *v++ = *hs++) ;  /* need to esc " */
    if(*hs == '"') {
      hs++ ;
      *v++ = '\0' ;
      return(NO_ERROR) ;
    } else {
      error("Improper href. Missing closing double quote") ;
      return(HPS_ERROR) ;
    }
  } else {
    error("Improper href. Missing opening double quote") ;
    return(HPS_ERROR) ;
  }
}

int do_link P2C(char *, s, int, type)
{

  Hps_link *p ;
  
  if (HREF_COUNT++ > 0) {
    error("!HTML string contains more than one href") ;
    return(HPS_ERROR) ;
  }
  p = (Hps_link *)malloc(sizeof(*p)) ;
  p->action = GoTo ;
  p->title = (char *)malloc(strlen(s)+1) ;
  p->title = s ;
  p->srcpg = pagecounter ;
  p->rect.llx = dvi_to_hps_conv(hh + hoff,HORIZONTAL) ; 
  p->rect.lly = dvi_to_hps_conv(vv + voff,VERTICAL)-FUDGE ;
  p->rect.urx = -1.0 ;
  p->rect.ury = -1.0 ;
  p->vert_dest = -1 ; 
  p->page = -1 ;
  p->color[0] = 0 ;
  p->color[1] = 0 ; /* Blue links */
  p->color[2] = 1 ;
  p->border[0] = 1 ; /* horizontal corner radius */
  p->border[1] = 1 ; /* vertical corner radius */
  p->border[2] = 1 ; /* box line width */
  p->border[3] = 3 ; /* dash on size */
  p->border[4] = 3 ;  /* dash off size */

  current_name = (char *)malloc(strlen(s)+1) ; 
  current_name = s ; 
  current_type = type ;
  current_pushcount = pushcount ;
  install_link(s, p, type) ;
  return(NO_ERROR) ;
}
                 
unsigned int hash_string P1C(char *, s) 
{
  unsigned hashval ;
  for (hashval = 0 ; *s != '\0' ; s++)
    hashval = *s + 31 * hashval ;
  return hashval % HASHSIZE ;
}

/* lookup a hashed name */ 

struct nlist *lookup_link P2C(char *, s, int, type)
{
  struct nlist *np ;
  
  for(np = type ? link_sources[hash_string(s)] : link_targets[hash_string(s)] ;
        np != NULL ; np = np -> next)
      if (strcmp(s, np->name) == 0)
      return np ; /* found */
  return NULL ; /* not found */
}

struct nlist *install_link P3C(char *, name, Hps_link *, defn, int, type)
{
  struct nlist *np ;
  unsigned hashval ;
    np = (struct nlist *)malloc(sizeof(*np)) ;
    if (np == NULL || (np->name = dup_str(name)) == NULL)
      return NULL ;
    hashval = hash_string(name) ;
    np->next = type ? link_sources[hashval] : link_targets[hashval] ;
    (type ? link_sources : link_targets)[hashval] = np ;
    if ((np->defn = link_dup(defn)) == NULL)
      return NULL ; 
  return np ;
}

#ifndef KPATHSEA
char *dup_str P1C(char *, w) /* make a duplicate of s */
{
  char *p ;
  p = (char *)malloc(strlen(w)+1) ;
  if (p != NULL)
    strcpy(p,w) ;
  return p ;
}
#endif

Hps_link *link_dup P1C(Hps_link *, s) /* make a duplicate link */
{
  Hps_link *p ;
  
  p = (Hps_link *) malloc(sizeof(*p)) ;
  if (p != NULL)
    p = s ;
  return p ;
}

double dvi_to_hps_conv P2C(int, i, int, dir)
{
  double hps_coor ;
  /* Convert dvi integers into proper hps coordinates
     Take into account magnification and resolution that dvi file was
     produced at */ 
  hps_coor = dir ? (((i * 72.0) / vactualdpi) +MARGIN) : (PAGESIZE - ((i * 72.0) / (vactualdpi)) - MARGIN  ) ;
  return(hps_coor) ;
}

int vert_loc P1C(int, i)
{
  int return_value ;
  return_value = (int) (i + (PAGESIZE / 4) + FUDGE) ; 
  if ( return_value > PAGESIZE) {
    return((int)PAGESIZE) ;
    } else if (return_value <  (PAGESIZE / 4.0)) {
        return((PAGESIZE / 4)) ;
        } else return(return_value) ;
}

Hps_link *dest_link P1C(char *, s)
{
  /* Assume for now that only one entry with same NAME, i.e.
     Should be true for all legitimate papers.
     Also, assume prepending of # for names. */
  
  struct nlist *np ;
  
  s++ ; /* get rid of hashmark */
  for(np = link_targets[hash_string(s)] ; np != NULL ; np = np -> next) {
     if ( href_name_match(s, np->name)) {
      return (np->defn) ; /* found */
      }
      }
  error("Oh no, link not found in target hashtable") ;
  error(s) ;
  error("!") ;
  return NULL ; /* not found */
}

int count_targets P1H(void) {
  int count=0 ;
  int i ;
  struct nlist *np ;
  
  for (i = 0 ; i < HASHSIZE ; i++) 
    for(np = link_targets[i]  ; np != NULL ; np = np -> next) 
      count++ ; 
  return count ;      
}

void do_targets P1H(void) {

  struct nlist *np ;
  int i ;
  Hps_link *dest ;
  
  for (i = 0 ; i < HASHSIZE ; i++) 
    for(np = link_sources[i]  ; np != NULL ; np = np -> next) {
      if (np->name[0] == '#') { 
	dest = dest_link(np->name) ;
	np->defn->page = dest->srcpg ;
	np->defn->vert_dest = vert_loc((int) dest->rect.lly) ;
      } 
    }
}

void do_target_dict P1H(void)
{
  struct nlist *np ;
  int i ;
  (void) fprintf(bitfile, "HPSdict begin\n") ;
  (void)fprintf(bitfile, "/TargetAnchors\n") ;
  (void)fprintf(bitfile, "%i dict dup begin\n",count_targets()) ;
  
  for (i = 0 ; i < HASHSIZE ; i++) 
    for(np = link_targets[i]  ; np != NULL ; np = np -> next) 
      (void)fprintf(bitfile, "(%s) [%i [%.0f %.0f %.0f %.0f] %i] def\n",
		    np->defn->title, np->defn->srcpg, 
		    np->defn->rect.llx, np->defn->rect.lly,
		    np->defn->rect.urx, np->defn->rect.ury,
		    vert_loc((int) np->defn->rect.lly)) ;  
  (void)fprintf(bitfile,"end targetdump-hook def end\n") ;
}

int href_name_match P2C(char *, h, char *, n)
{
  int count = 0 ;
  int name_length = strlen(n) ;
  while((*h == *n) & (*h != '\0') )  {
    count++ ;
    h++ ;
    n++ ;
    }
  if (name_length == count) {
    return 1 ;
    } else {
     /* printf(" count: %i \n", count) ; */
    return 0 ;
    }
}

void stamp_hps P1C(Hps_link *, pl)
{
  char tmpbuf[200] ;
  if (pl == NULL) {
    error("Null pointer, oh no!") ;
    return ;
  } else {
    /* print out the proper pdfm with local page info only 
     *  target info will be in the target dictionary */
    (void)sprintf(tmpbuf, 
		  " (%s) [[%.0f %.0f %.0f %.0f] [%i %i %i [%i %i]] [%.0f %.0f %.0f]] pdfm ", pl->title, pl->rect.llx, pl->rect.lly, pl->rect.urx, pl->rect.ury,
		  pl->border[0], pl->border[1], pl->border[2], pl->border[3],pl->border[4],
		  pl->color[0], pl->color[1], pl->color[2]) ;
    cmdout(tmpbuf) ; 
  }
  
}

/* For external URL's, we just pass them through as a string. The hyperps
 * interpreter can then do what is wants with them.
 */
void stamp_external P2C(char *, s, Hps_link *, pl) 
{
  char tmpbuf[200];
  if (pl == NULL) {
    error("Null pointer, oh no!") ;
    return ;
  } else {
    /* print out the proper pdfm with local page info only 
     *  target info will be in the target dictionary */
    (void)sprintf(tmpbuf," [[%.0f %.0f %.0f %.0f] [%i %i %i [%i %i]] [%.0f %.0f %.0f]] (%s) pdfm ", pl->rect.llx, pl->rect.lly, pl->rect.urx, pl->rect.ury,
		  pl->border[0], pl->border[1], pl->border[2], pl->border[3],pl->border[4],
		  pl->color[0], pl->color[1], pl->color[2], s) ;
    cmdout(tmpbuf) ;
  }
}

void finish_hps P1H(void) {
  fclose(bitfile) ;
  set_bitfile("head.tmp",1);
  do_targets() ;
  do_target_dict();
  (void)fprintf(bitfile, "TeXDict begin\n") ;
  (void)fprintf(bitfile, "%%%%EndSetup\n") ;
  fclose(bitfile) ;
  open_output() ;
  noprocset = 1 ;
  removecomments = 0;
  copyfile("head.tmp") ;
  copyfile("body.tmp") ;
}

void set_bitfile P2C(char *, s, int, mode)
{  
if ((bitfile=fopen(s, mode ? FOPEN_ABIN_MODE : FOPEN_WBIN_MODE))==NULL) {
   error(s) ;
   error("!couldn't open file") ;
  }
}

void vertical_in_hps P1H(void) { 
  Rect_list *rl ;
  /*printf("in vertical_in_hps") ; */
  if (current_type == NAME) return; /* Handle this case later */
  if (!current_rect_list) {
    current_rect_list = (Rect_list *)malloc(sizeof(Rect_list)) ;
    current_rect_list->next = NULL ;
  }
  else {
    rl = (Rect_list *)malloc(sizeof(Rect_list)) ;
    rl->next = current_rect_list ;
    current_rect_list = rl ;
  }
  current_rect_list->rect.llx = dvi_to_hps_conv(hh + hoff,HORIZONTAL) ; 
  current_rect_list->rect.lly = dvi_to_hps_conv(vv + voff,VERTICAL)-FUDGE ;
  current_rect_list->rect.urx = dvi_to_hps_conv(hhmem, HORIZONTAL) ;
  current_rect_list->rect.ury = dvi_to_hps_conv(vvmem, VERTICAL)-FUDGE ; 
  
  if (POPPED) start_new_box() ; 
}

void print_rect_list P1H(void) {
  Rect_list *rl, *rln ;
  
  for(rl = current_rect_list ; rl != NULL ; rl = rln) {
    /* printf("Rectangle is %.0f, %.0f, %.0f, %.0f\n", rl->rect.llx, rl->rect.lly, 
            rl->rect.urx, rl->rect.ury) ; */
    rln = rl -> next ;
    free(rl) ;
  } 
} 

void end_current_box P1H(void) { 
  Hps_link *nl ;
  
  POPPED = TRUE ;
  HREF_COUNT-- ;
  if (current_type == HREF && current_name[0] != '#') {
    if ((nl = lookup_link(current_name, current_type)->defn)) { 
      nl->rect.urx = dvi_to_hps_conv(hhmem + hoff,HORIZONTAL) ;
      nl->rect.ury = dvi_to_hps_conv(vvmem + voff, VERTICAL)-FUDGE+12.0 ; 
      stamp_external(current_name,nl); /* Broken lines ? */
    } else {
      error("!Null lookup");
    }
  } else {
    if ((nl = lookup_link(current_name, current_type)->defn)) { 
      nl->rect.urx = dvi_to_hps_conv(hhmem + hoff,HORIZONTAL) ;
      nl->rect.ury = dvi_to_hps_conv(vvmem + voff, VERTICAL)-FUDGE+12.0 ; 
      if (current_type) {
	stamp_hps(nl) ; /* Put link info right where special is */
      }
    } else {
      error("!Null lookup");
    }
    /* printf("Ended box %.0f, %.0f, %.0f, %.0f\n", nl->rect.llx, \
       nl->rect.lly,nl->rect.urx, nl->rect.ury) ; */
  }
}

void start_new_box P1H(void) {
  POPPED = FALSE ; 
  do_link(current_name, current_type) ;
}
#else
int no_hypertex ; /* prevent an empty file */
#endif