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

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */

/* 
This file is used to build a persistent XML parse tree.

Eventually, this file will also contain the code to implement
the DOM APIs for access to this tree (any volunteers?)

If you have questions, send them to guha@netscape.com
*/

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

void
XMLDOM_CharHandler (XMLFile f, const char* content, int len) {
  XMLElement xmle = (XMLElement)getMem(sizeof(XMLElementStruct));  
  xmle->content = getMem(len+1);
  memcpy(xmle->content, content, len);
  xmle->tag = "xml:content";
  addChild(f->current, xmle);
}


char *
xmlgetAttributeValue (const char** attlist, char* elName)
{
  size_t n = 0;
  if (!attlist) return NULL;
  while ((n < 2*MAX_ATTRIBUTES) && (*(attlist + n) != NULL)) {
    if (strcmp(*(attlist + n), elName) == 0) return (char*)*(attlist + n + 1);
    n = n + 2;
  }
  return NULL;
}

char **
copyCharStarList (char** list)
{
  size_t length = 0;
  while (*(list + length++)){}
  if (length == 0) {
    return NULL;
  } else {
    char** ans = getMem(length * sizeof(char*));
    size_t n = 0;
    while (*(list + n++)) {
      *(ans + n - 1) = copyString(*(list + n - 1));
    }
    return ans;
  }
}


#ifdef MOZILLA_CLIENT
char *
makeAbsoluteURL (char* p1, char* p2)
{
  return NET_MakeAbsoluteURL(p1, p2);

}


#endif

void
addStyleSheet(XMLFile f, StyleSheet ss)
{
  if (f->ss == NULL) {
    f->ss = ss;
  } else {
    StyleSheet nss = f->ss;
    while (nss->next != NULL) nss = nss->next;
    nss->next = ss;
  }
}


void
addChild (XMLElement parent, XMLElement child)
{
  if (parent->child == NULL) {
    parent->child = child;
  } else {
    XMLElement nc = parent->child;
    while (nc->next) {nc = nc->next;}
    nc->next = child;
  }
}

void XMLDOM_EndHandler (XMLFile f, const char* elementName) {
  f->current = f->current->parent;
}

void XMLDOM_StartHandler (XMLFile f, const char* elementName, const char** attlist) {
  XMLElement xmle = (XMLElement)getMem(sizeof(XMLElementStruct));
  xmle->parent = f->current;
  if (f->top == NULL) f->top = xmle;  
  xmle->tag = copyString(elementName);
  xmle->attributes = copyCharStarList((char**)attlist);
  if (f->current)  addChild(f->current, xmle);
  f->current = xmle;
#ifdef MOZILLA_CLIENT
  if (xmlgetAttributeValue(xmle->attributes, XLL) != NULL) {
    char* linkTag = xmlgetAttributeValue(xmle->attributes, XLL);
    char* hrefVal = xmlgetAttributeValue(xmle->attributes, href);
    char* type = xmlgetAttributeValue(xmle->attributes, "Role");
    char* show = xmlgetAttributeValue(xmle->attributes, "Show");

    if (linkTag && (stringEquals(linkTag, "LINK")) &&
        hrefVal && type && stringEquals(type, "HTML") &&
        show && (stringEquals(show, "Embed"))) {
      XMLHTMLInclusion incl = (XMLHTMLInclusion)getMem(sizeof(XMLHTMLInclusionStruct));
      incl->xml = f;
      incl->content = (char**)getMem(400);
      xmle->content = (char*) incl;
      f->numOpenStreams++;
      readHTML(makeAbsoluteURL(f->address, hrefVal), incl);
      if (f->numTransclusions == 0) {
        f->transclusions = (XMLElement*)getMem(sizeof(XMLElement*) * 10);
      } 
      f->transclusions[f->numTransclusions++] = xmle;
#ifdef DOM
      ET_ReflectObject(f->mwcontext, f->transclusions[f->numTransclusions - 1], NULL, LO_DOCUMENT_LAYER_ID, 
		  f->numTransclusions - 1, LM_TRANSCLUSIONS);
#endif
    }
  }
#endif
}


char** 
setAttribute (char** attlist, char* elName, char* elValue)
{
  size_t n = 0;
  char** nattlist;
  if (!attlist) return NULL;
  while ((n < 2*MAX_ATTRIBUTES) && (*(attlist + n) != NULL)) {
    if (strcmp(*(attlist + n), elName) == 0) {
      *(attlist + n + 1) = elValue;
      return attlist;
    }
    n = n + 2;
  }

  nattlist = getMem(n+2);
  memcpy(nattlist, attlist, (n * sizeof(char**)));
  *(nattlist + n) = elName;
  *(nattlist + n + 1) = elValue;
  freeMem(attlist);
  return nattlist;
}

#ifdef MOZILLA_CLIENT
void XMLSetTransclusionProperty( XMLFile f, uint index, char* propName, char* propValue ) {
  XMLElement el = f->transclusions[index];
  if (!el) return;
  el->attributes = setAttribute(el->attributes, propName, propValue);
  if (stringEquals(propName, "href")) {
    XMLHTMLInclusion incl =  (XMLHTMLInclusion) el->content;
    freeMem(incl->content);
    incl->content =  (char**)getMem(400);
    incl->n = 0;
    readHTML (makeAbsoluteURL(f->address, propValue), (XMLHTMLInclusion)el->content);
  } else if (stringEquals(propName, "visibility")
             ||stringEquals(propName, "display")) {
    xmlhtml_complete_int(f);
  }
}

void XMLDeleteMochaObjectReference(XMLFile f, uint index)
{
  XMLElement el = f->transclusions[index];
  if (el) el->mocha_object = NULL;
}

int32
XMLTransclusionCount(MWContext *context)
{
  if (!context) {
    return 0;
  } else {
    XMLFile f = (XMLFile)context->xmlfile;
    if (!f) {
      return 0;
    } else {
      return f->numTransclusions;
    }
  }
}

JSObject* XML_GetMochaObject (void* el) {
  return ((XMLElement)el)->mocha_object;
}

void XML_SetMochaObject (void* el, JSObject* jso) {
  ((XMLElement)el)->mocha_object = jso;
}


void * /* XMLElement */ XMLGetTransclusionByIndex( MWContext *context, uint index )
{
  XMLFile f = context->xmlfile;
  if (!f) return 0;
  return f->transclusions[index];
}

#endif

void XMLDOM_PIHandler (XMLFile f, const char *elementName, const char *data) {  
#ifdef MOZILLA_CLIENT
  if (startsWith("xml:stylesheet", elementName))   {
    char* url ; 
	char* attlist[2*MAX_ATTRIBUTES+1];
	char* attv;
    char* xdata = ((data == NULL) ? NULL : copyString(data));
	StyleSheet ss;
    tokenizeXMLElement ((char*) xdata, (char**)attlist);
    attv = xmlgetAttributeValue(attlist, "type");
	if (!(attv && (startsWith("text/css", attv)))) {
		freeMem(xdata);
		return;
	}
	url = xmlgetAttributeValue(attlist, href);
    ss = (StyleSheet) getMem(sizeof(StyleSheetStruct));
    ss->address = makeAbsoluteURL(f->address, url);
    ss->line = (char*)getMem(XML_BUF_SIZE);
    ss->holdOver = (char*)getMem(XML_BUF_SIZE);
    ss->lineSize = XML_BUF_SIZE;
    ss->xmlFile = f;
    f->numOpenStreams++;
    addStyleSheet(f, ss);
    readCSS(ss);
	freeMem(xdata); 
    return;
  }
#endif  
}
  

void
tokenizeXMLElement (char* attr, char** attlist)
{
  size_t n = 0;
  size_t s = strlen(attr); 
  char c ;
  size_t m = 0;
  size_t atc = 0;
  PRBool inAttrNamep = 1; 
  while (atc < 2*MAX_ATTRIBUTES+1) {*(attlist + atc++) = NULL;}
  atc = 0;
  while (n < s) {
    PRBool attributeOpenStringSeenp = 0;
    m = 0;
    c = attr[n++];
    while ((n <= s) && (atc < 2*MAX_ATTRIBUTES)) {
      if (inAttrNamep && (m > 0) && (wsc(c) || (c == '='))) {
        attr[n-1] = '\0';
        *(attlist + atc++) = &attr[n-m-1];
        break;
      }
      if  (!inAttrNamep && attributeOpenStringSeenp && (c == '"')) {
        attr[n-1] = '\0';
        *(attlist + atc++) = &attr[n-m-1];
        break;
      }
      if (inAttrNamep) {
        if ((m > 0) || (!wsc(c))) m++;
      } else {
        if (c == '"') {
          attributeOpenStringSeenp = 1;
        } else {
          if ((m > 0) || (!(wsc(c)))) m++;
        }
      }
      c = attr[n++];
    }
    inAttrNamep = (inAttrNamep ? 0 : 1);
  }
}