gecko-dev/modules/xml/glue/xmlss.c

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/* 
   This is some glue code for a semi-parsing CSS. Its used to
   output html from XML.
   This will be changed when we incorporate the real xml parser 
   from James Clark will replace this  within the next few weeks.

   For more information on this file, contact rjc or guha 
   For more information on RDF, look at the RDF section of www.mozilla.org
   For more info on XML in navigator, look at the XML section
   of www.mozilla.org.
*/

#include "xmlss.h"
#define href "href"
#define XLL   "XML-Link"

#define BUF_SIZE 4096

int
parseNextXMLCSSBlob (NET_StreamClass *stream, char* blob, int32 size)
{
  StyleSheet ss;
  int32 n, last, m;
  PRBool somethingseenp = false;
  n = last = 0;
  
  ss = (StyleSheet)(stream->data_object);
  if ((ss == NULL) || (size < 0)) {
    return MK_INTERRUPTED;
  }
  
  while (n < size) {
    char c = blob[n];
    m = 0;
    memset(ss->line, '\0', ss->lineSize);
    if (ss->holdOver[0] != '\0') {
      memcpy(ss->line, ss->holdOver, strlen(ss->holdOver));
      m = strlen(ss->holdOver);
      somethingseenp = 1;
      memset(ss->holdOver, '\0', BUF_SIZE);
    }
    while ((m < 300) && (c != '{') && (c != '}')) {
      ss->line[m] = c;
      m++;
      somethingseenp = (somethingseenp || ((c != ' ') && 
					   (c != '\r') && (c != '\n')));
      n++;
      if (n < size) {
	c = blob[n]; 
      }  else break;
    }
    if (c == '}') ss->line[m] = c;
    n++;
    if (m > 0) {
      if ((c == '}') || (c == '{')) {
        last = n;
        if (c == '{') ss->holdOver[0] = '{'; 
        if (somethingseenp) {
          parseNextXMLCSSElement(ss, ss->line);
        }
      }  else if (size > last) {
          memcpy(ss->holdOver, ss->line, m);
      }
    } else if (c == '{') ss->holdOver[0] = '{';
  }
  return(size);
}

static int32 style_id_counter = 0;

void
parseNextXMLCSSElement (StyleSheet ss, char* ele)
{
  if (ele[0] == '{') {
    char* sty = getMem(strlen(ele)-1);
    memcpy(sty, &ele[1], strlen(ele)-2);
    ss->el->style = sty;
  } else {
     StyleElement se = (StyleElement) getMem(sizeof(StyleElementStruct));
     size_t numTags,  size, n, count;
     se->id = ++style_id_counter;
     se->next = ss->el;
     ss->el = se;
     size = strlen(ele);
     count = n = 0;
     numTags = countTagStackSize(ele);
     while (count < numTags) {
       size_t st = 0; 
       char** tgs =  (char**) getMem(numTags * sizeof(char**));
       se->tagStack = tgs;
       while (st < numTags) {	 
	 *(tgs + st++) = getNextSSTag(ele, &n);
       }
       count++;
     }
  }
}



size_t
countSSNumTags (char* ele)
{
  size_t n = 0;
  size_t m = 1;
  size_t sz = strlen(ele);
  while (n < sz) {
    if (ele[n++] == ',') m++;
  }
  return m;
}



size_t
countTagStackSize (char* ele)
{
  size_t n = 0;
  size_t m = 0;
  PRBool inSpace = 1;
  size_t sz = strlen(ele);
  while (n < sz) {
    if (ele[n] == ',') break;
    if ((ele[n] != ' ') && (ele[n] != '\r') && (ele[n] != '\n')) {
      if (inSpace) {
		  m++;
		  inSpace = 0;
	  }
    } else inSpace = 1;
    n++;
  }
  return m;
}



char*
getNextSSTag (char* ele, size_t* n)
{
  char tag[100];
  size_t m = 0;
  char c = ele[*n];
  size_t s = strlen(ele);
  memset(tag, '\0', 100);
  while ((c == '\r') || (c == ' ') || (c == '\n')) {
	*n = *n + 1;
	c = ele[*n];
  }
  while ((c != ' ') && (c != ',') && (*n < s)) {
    tag[m++] = c;
    *n = *n + 1;
    c = ele[*n];
  }
  return copyString(tag);
}



void
outputAttributes(XMLFile f, char** attlist)
{
  uint32 n = 0;
  PRBool xmlinkp = (getAttributeValue(attlist, XLL) != NULL);
  if (!attlist) return ;
  while ((n < 2*MAX_ATTRIBUTES) && (*(attlist + n) != NULL)) {
    if (!(xmlinkp && stringEquals(*(attlist + n), href))) {
      outputToStream(f, *(attlist + n));
      outputToStream(f, "=\"");
      outputToStream(f, *(attlist + n + 1));
      outputToStream(f, "\" ");
    }

    n = n + 2;
  }
}



void
outputAsHTML (XMLFile f, XMLElement el)
{
  if (strcmp(el->tag, "xml:content") == 0) {
    outputToStream(f, el->content);
  } else {
    char* htmlEquiv = getAttributeValue(el->attributes, "html");
    char* linkTag   = getAttributeValue(el->attributes, XLL);
    char*  htmlBuff = getMem(1024);
    XMLElement child = el->child;
    PRBool suppressTag = !startsWith("html:", el->tag) ; 

    if (linkTag && (stringEquals(linkTag, "LINK"))) {
      char* hrefVal = getAttributeValue(el->attributes, href);
      if (hrefVal) {
        char* type = getAttributeValue(el->attributes, "Role");
        char* show = getAttributeValue(el->attributes, "Show");
        if (show &&(strcmp(show, "EMBED") == 0)) {
          if (type && (strcmp(type, "HTML") == 0)) {
            int32 n = 0;
            XMLHTMLInclusion incl = (XMLHTMLInclusion) el->content;
            while (incl && *(incl->content + n)) {              
              outputToStream(f, (*(incl->content + n)));
              n++;
            }           
          } else if (type && (strcmp(type, "IMAGE") == 0)) {
            sprintf(htmlBuff, "<img src=%s>\n", hrefVal);
            outputToStream(f, htmlBuff);
          }
          freeMem(htmlBuff);
          return;
        } else {
          sprintf(htmlBuff, "<a href=\"%s\">", hrefVal);
          outputToStream(f, htmlBuff);
       }
      } else {
        linkTag = 0;
      }
    }

    outputStyleSpan(f, el, 0);

    if (htmlEquiv) {
      sprintf(htmlBuff, "<%s ", htmlEquiv);
      outputToStream(f, htmlBuff);
      outputAttributes(f, el->attributes);
      outputToStream(f, ">\n");
    } else if (!suppressTag){
      sprintf(htmlBuff, "<%s ", &((el->tag)[5]));
      outputToStream(f, htmlBuff);
      outputAttributes(f, el->attributes);
      outputToStream(f, ">\n");
    }
    
    while (child) {
      outputAsHTML(f, child);
      child = child->next;
    }
    if (htmlEquiv) {
      sprintf(htmlBuff, "</%s>\n", htmlEquiv);
      outputToStream(f, htmlBuff);
    } else  if (!suppressTag) {
      sprintf(htmlBuff, "</%s>\n", &((el->tag)[5]));
      outputToStream(f, htmlBuff);
    }
    outputStyleSpan(f, el, 1);
    if (linkTag) outputToStream(f, "</a>");
    freeMem(htmlBuff);
  }
}

void
outputAllStyles(XMLFile xf)
{
  char *ssline;
  StyleSheet ss ;
  StyleElement se;
  outputToStream(xf, "<style>\n");
  for (ss = xf->ss; (ss != NULL) ; ss = ss->next) {    
    for (se = ss->el; (se != NULL) ; se = se->next) {
      if (se->style) { 
      ssline = PR_smprintf(".xml%d {%s}\n", se->id, se->style);
      PR_ASSERT(ssline);
      if (!ssline)
          return;
      outputToStream(xf, ssline);
      free(ssline);
	  }
    }
  }
  outputToStream(xf, "</style>\n");
}

void
convertToHTML (XMLFile xf) {
  XMLElement el = xf->top;
  xf->numOpenStreams--;
  if (xf->numOpenStreams < 1) {
    outputToStream(xf, "<html><body>");
    outputAllStyles(xf);
    outputAsHTML(xf, el); 
    outputToStream(xf, "</body></html>");

  }
}

void
outputStyleSpan (XMLFile f, XMLElement el, PRBool endp)
{
  char *ssid;
  StyleSheet ss ;
  StyleElement se;
  for (ss = f->ss; (ss != NULL) ; ss = ss->next) {    
    for (se = ss->el; (se != NULL) ; se = se->next) {
	 
      if (se->style && stringEquals((se->tagStack)[0],  el->tag)) {
        /* check for se->style from Steve Wingard <swingard@spyglass.com> */
        PRBool divp = startsWith("Display:Block;", se->style);
        PRBool listp = startsWith("Display:List-item;", se->style);
        if (!endp) {
          if (divp) {
            outputToStream(f, "<div ");
          } else  if (listp) {
            outputToStream(f, "<UL><LI><span ");
          } else   {
            outputToStream(f, "<span ");
          }
          ssid=PR_smprintf("class=xml%d>\n", se->id);
          PR_ASSERT(ssid);
          if (!ssid)
              return;
          outputToStream(f, ssid);
          free(ssid);
        } else {
          if (divp) {
            outputToStream(f, "</div>"); 
          } else if (listp) {
            outputToStream(f, "</UL></span>");
          } else {
            outputToStream(f, "</span>");
          }
        }
      }
    }
  }
}