
//  ------------------------------------------------------------------
//  GoldED+
//  Copyright (C) 1990-1999 Odinn Sorensen
//  Copyright (C) 1999-2000 Alexander S. Aganichev
//  ------------------------------------------------------------------
//  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., 59 Temple Place, Suite 330, Boston,
//  MA 02111-1307 USA
//  ------------------------------------------------------------------
//  $Id$
//  ------------------------------------------------------------------
//  Container class.
//  ------------------------------------------------------------------

#include "golded.h"


//  ------------------------------------------------------------------

static bool strncont(const char *beginword, const char *stylestopchars, int n)
{
  for(; (n > 0) and (*beginword != NUL); n--, beginword++) {
    if(strchr(stylestopchars, *beginword) != NULL)
      return true;
  }
  return false;
}


//  ------------------------------------------------------------------

static bool in_ftn_domained_address(const char *ptr, const char *txt) {

  while((ptr != txt) and (not isspace(*ptr) and not g_isalpha(*ptr))) {
    if(isdigit(ptr[0]) and ((ptr[1] == ':') or (ptr[1] == '/')) and isdigit(ptr[2]))
      return true;
    --ptr;
  }
  return false;
}


//  ------------------------------------------------------------------

const char *url_begin(const char *ptr) {

  if(strnieql(ptr, "http://", 7))
    return ptr+7;
  if(strnieql(ptr, "https://", 8))
    return ptr+8;
  if(strnieql(ptr, "ftp://", 6))
    return ptr+6;
  if(strnieql(ptr, "www.", 4))
    return ptr+4;
  if(strnieql(ptr, "ftp.", 4))
    return ptr+4;
  if(strnieql(ptr, "mailto:", 7))
    return ptr+7;
  if(strnieql(ptr, "news:", 5))
    return ptr+5;
  if(strnieql(ptr, "ed2k://", 7))
    return ptr+7;
  return NULL;
}


//  ------------------------------------------------------------------

inline bool isstylechar(char c) {

  if(strchr(CFG->stylecodestops, c) != NULL)
    return false;
  return (c == '*') or (c == '/') or (c == '_') or (c == '#');
}

void Container::StyleCodeHighlight(const char* text, int row, int col, bool dohide, vattr color) {

  uint sclen = 0;
  const char* txptr = text;
  char buf[200];
  const char* ptr = text;
  const char* stylemargins = " -|\\";    // we probably have to make a keyword for it
  char* punctchars = CFG->stylecodepunct;
  char* stylestopchars = CFG->stylecodestops;
  char prevchar = ' ';
  bool usestylies = dohide or AA->adat->usestylies;

  if(usestylies or CFG->highlighturls) {
    while(*ptr) {
      if(usestylies and isstylechar(*ptr)) {
        if(strchr(punctchars, prevchar)) {
          int bb = 0, bi = 0, bu = 0, br = 0;
          const char* beginstyle = ptr;
          while(isstylechar(*ptr)) {
            switch(*ptr) {
              case '*': bb++; break;
              case '/': bi++; break;
              case '_': bu++; break;
              case '#': br++; break;
            }
            ptr++;
          }
          if((bb <= 1) and (bi <= 1) and (br <= 1) and (bu <= 1) and *ptr) {
            const char* beginword = ptr;                 //  _/*>another*/_
            const char* end = ptr;
            do {
              end = strpbrk(++end, punctchars);
            } while ((end != NULL) and not isstylechar(*(end-1)));
            if(end == NULL)
              end = ptr+strlen(ptr);
            const char* endstyle = end-1;                //  _/*another*/>_
            if(isstylechar(*endstyle) and not strchr(stylemargins, *beginword)) {
              const char* endword = endstyle;
              int eb = 0, ei = 0, eu = 0, er = 0;
              while(isstylechar(*endword)) {
                switch(*endword) {
                  case '*': eb++; break;
                  case '/': ei++; break;
                  case '_': eu++; break;
                  case '#': er++; break;
                }
                endword--;
              }                                          //  _/*anothe>r*/_
              if(endword >= beginword and not strchr(stylemargins, *endword)) {
                if((bb == eb) and (bi == ei) and (bu == eu) and (br == er)) {
                  bool style_stops_present = strncont(beginword, stylestopchars, endword-beginword);
                  if(not style_stops_present) {
                    int colorindex = (bb ? 1 : 0) | (bi ? 2 : 0) | (bu ? 4 : 0) | (br ? 8 : 0);
                    strxcpy(buf, txptr, (uint)(beginstyle-txptr)+1);
                    prints(row, col+sclen, color, buf);
                    sclen += strlen(buf);
                    if(dohide)
                      strxcpy(buf, beginword, (uint)(endword-beginword)+2);
                    else
                      strxcpy(buf, beginstyle, (uint)(endstyle-beginstyle)+2);
                    prints(row, col+sclen, C_STYLE[colorindex], buf);
                    sclen += strlen(buf);
                    txptr = end;
                    ptr = end-1;
                  }
                }
              }
            }
          }
        }
      }
      else if(CFG->highlighturls) {
        const char *begin;

        if(((begin = url_begin(ptr)) != NULL) and
           ((ptr == text) or (not isxalnum(ptr[-1]) and (ptr[-1] != '@')))) {
          const char *end = begin+strcspn(begin, " \t\"\'<>()[]");

          if(ispunct(end[-1]) and (end[-1] != '/'))
            --end;
          if(begin < end) {
            strxcpy(buf, txptr, (uint)(ptr-txptr)+1);
            prints(row, col+sclen, color, buf);
            sclen += strlen(buf);
            strxcpy(buf, ptr, (uint)(end-ptr)+1);
            prints(row, col+sclen, C_READU, buf);
            sclen += strlen(buf);
            txptr = end;
            ptr = end-1;
          }
        }
        else if(((ptr == text) or not in_ftn_domained_address(ptr, text)) and
                (isascii(*ptr) and not isspace(*ptr) and not ispunct(*ptr) and
                 ((ptr == text) or (not isxalnum(ptr[-1]) and (ptr[-1] != '@'))))) {
          // try to guess e-mail address...
          const char *commerce_at = NULL;

          if(*ptr == '\"') {
            const char *pair_quote = strchr(ptr+1, '\"');
            if(pair_quote != NULL) {
              commerce_at = pair_quote+1;
            }
          }
          else {
            commerce_at = strpbrk(ptr, " \t:/@");
          }
          if((commerce_at != NULL) and (*commerce_at == '@')) {
            int dots_found = 0;
            ++commerce_at;
            while((*commerce_at != NUL) and (isalnum(*commerce_at) or (*commerce_at == '.') or (*commerce_at == '-'))) {
              if(*commerce_at == '.')
                ++dots_found;
              ++commerce_at;
            }
            while((commerce_at[-1] == '.') or (commerce_at[-1] == '-')) {
              --commerce_at;
              if(*commerce_at == '.')
                --dots_found;
            }
            if(dots_found) {
              strxcpy(buf, txptr, (uint)(ptr-txptr)+1);
              prints(row, col+sclen, color, buf);
              sclen += strlen(buf);
              strxcpy(buf, ptr, (uint)(commerce_at-ptr)+1);
              prints(row, col+sclen, C_READU, buf);
              sclen += strlen(buf);
              txptr = commerce_at;
              ptr = commerce_at-1;
            }
          }
        }
      }
      if(*ptr)
        prevchar = *ptr++;
    }
  }
  if(*txptr) {
    prints(row, col+sclen, color, txptr);
    sclen += strlen(txptr);
  }
  uint splen = strlen(text) - sclen;
  if(splen) {
    memset(buf, ' ', splen); buf[splen] = NUL;
    prints(row, col+sclen, color, buf);
  }
}


//  ------------------------------------------------------------------
