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/***************************************************************************
xml.cpp - description
-------------------
begin : Fri Aug 9 2002
copyright : (C) 2002 by ARRL
author : Jon Bloom
email : jbloom@arrl.org
revision : $Id: xml.cpp,v 1.7 2005/02/18 20:21:01 ke3z Exp $
***************************************************************************/
#include "xml.h"
#include "expat.h"
#include <stack>
#include <fstream>
#include <zlib.h>
using namespace std;
namespace tqsllib {
pair<string,bool>
XMLElement::getAttribute(const string& key) {
string s;
XMLElementAttributeList::iterator pos;
pos = _attributes.find(key);
pair<string,bool> rval;
if (pos == _attributes.end())
rval.second = false;
else {
rval.first = pos->second;
rval.second = true;
}
return rval;
}
void
XMLElement::xml_start(void *data, const XML_Char *name, const XML_Char **atts) {
XMLElement *el = (XMLElement *)data;
XMLElement new_el(name);
//cout << "Element: " << name << endl;
for (int i = 0; atts[i]; i += 2) {
new_el.setAttribute(atts[i], atts[i+1]);
}
if (el->_parsingStack.empty()) {
el->_parsingStack.push_back(el->addElement(new_el));
//cout << "Empty: " << new_el.getElementName() << endl;
} else {
//cout << "Adding: " << el->_parsingStack.back()->second.getElementName() << endl;
new_el.setPretext(el->_parsingStack.back()->second.getText());
el->_parsingStack.back()->second.setText("");
el->_parsingStack.push_back(el->_parsingStack.back()->second.addElement(new_el));
}
}
void
XMLElement::xml_end(void *data, const XML_Char *name) {
XMLElement *el = (XMLElement *)data;
if (!(el->_parsingStack.empty()))
el->_parsingStack.pop_back();
}
void
XMLElement::xml_text(void *data, const XML_Char *text, int len) {
XMLElement *el = (XMLElement *)data;
el->_parsingStack.back()->second._text.append(text, len);
}
/*
bool
XMLElement::parseFile(const char *filename) {
ifstream in;
in.open(filename);
if (!in)
return false; // Failed to open file
char buf[256];
XML_Parser xp = XML_ParserCreate(0);
XML_SetUserData(xp, (void *)this);
XML_SetStartElementHandler(xp, &XMLElement::xml_start);
XML_SetEndElementHandler(xp, &XMLElement::xml_end);
XML_SetCharacterDataHandler(xp, &XMLElement::xml_text);
_parsingStack.clear();
while (in.get(buf, sizeof buf, 0).good()) {
// Process the XML
if (XML_Parse(xp, buf, strlen(buf), 0) == 0) {
XML_ParserFree(xp);
return false;
}
}
bool rval = !in.bad();
if (!rval)
rval = (XML_Parse(xp, "", 0, 1) != 0);
XML_ParserFree(xp);
return rval;
}
*/
bool
XMLElement::parseFile(const char *filename) {
gzFile in = gzopen(filename, "rb");
if (!in)
return false; // Failed to open file
char buf[256];
XML_Parser xp = XML_ParserCreate(0);
XML_SetUserData(xp, (void *)this);
XML_SetStartElementHandler(xp, &XMLElement::xml_start);
XML_SetEndElementHandler(xp, &XMLElement::xml_end);
XML_SetCharacterDataHandler(xp, &XMLElement::xml_text);
_parsingStack.clear();
int rcount;
while ((rcount = gzread(in, buf, sizeof buf)) > 0) {
// Process the XML
if (XML_Parse(xp, buf, rcount, 0) == 0) {
gzclose(in);
XML_ParserFree(xp);
return false;
}
}
gzclose(in);
bool rval = (rcount == 0);
if (rval)
rval = (XML_Parse(xp, "", 0, 1) != 0);
XML_ParserFree(xp);
return rval;
}
static struct {
char c;
char *ent;
} xml_entity_table[] = {
{ '"', """ },
{ '\'', "'" },
{ '>', ">" },
{ '<', "<" }
};
static string
xml_entities(const string& s) {
string ns = s;
string::size_type idx = 0;
while ((idx = ns.find('&', idx)) != string::npos) {
ns.replace(idx, 1, "&");
idx++;
}
for (int i = 0; i < int(sizeof xml_entity_table / sizeof xml_entity_table[0]); i++) {
while ((idx = ns.find(xml_entity_table[i].c)) != string::npos)
ns.replace(idx, 1, xml_entity_table[i].ent);
}
return ns;
}
/* Stream out an XMLElement as XML text */
ostream&
operator<< (ostream& stream, XMLElement& el) {
bool ok;
XMLElement subel;
if (el.getElementName() != "") {
stream << "<" << el.getElementName();
string key, val;
bool ok = el.getFirstAttribute(key, val);
while (ok) {
stream << " " << key << "=\"" << xml_entities(val) << "\"";
ok = el.getNextAttribute(key, val);
}
if (el.getText() == "" && !el.getFirstElement(subel)) {
stream << " />";
return stream;
} else
stream << ">";
}
ok = el.getFirstElement(subel);
while (ok) {
string s = subel.getPretext();
if (s != "")
stream << xml_entities(s);
stream << subel;
ok = el.getNextElement(subel);
}
if (el.getText() != "")
stream << xml_entities(el.getText());
if (el.getElementName() != "")
stream << "</" << el.getElementName() << ">";
return stream;
}
} // namespace tqsllib
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