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// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "xml_parser.h"
#include <fstream>
namespace embree
{
//////////////////////////////////////////////////////////////////////////////
/// XML Input
//////////////////////////////////////////////////////////////////////////////
/*! parse a list of XML comments */
void parseComments(Ref<Stream<Token> >& cin)
{
while (cin->peek() == Token::Sym("<!--")) {
cin->drop();
while (cin->peek() != Token::Sym("-->")) {
if (cin->peek() == Token::Eof())
THROW_RUNTIME_ERROR(cin->get().Location().str()+": --> expected");
cin->drop();
}
cin->drop();
}
}
/*! parse XML parameter */
void parseParm(Ref<Stream<Token> >& cin, std::map<std::string,std::string>& parms)
{
std::string name = cin->get().Identifier();
if (cin->get() != Token::Sym("=")) THROW_RUNTIME_ERROR(cin->unget().Location().str()+": symbol \"=\" expected");
parms[name] = cin->get().String();
}
/*! parse XML header */
Ref<XML> parseHeader(Ref<Stream<Token> >& cin)
{
Ref<XML> xml = new XML;
if (cin->get() != Token::Sym("<?")) THROW_RUNTIME_ERROR(cin->unget().Location().str()+": wrong XML header");
xml->name = cin->get().Identifier();
parseComments(cin);
while (cin->peek() != Token::Sym("?>")) {
parseParm(cin,xml->parms);
parseComments(cin);
}
cin->drop();
return xml;
}
/*! parse XML tag */
Ref<XML> parseXML(Ref<Stream<Token> >& cin, size_t depth)
{
if (depth > 1024)
THROW_RUNTIME_ERROR(cin->peek().Location().str()+": maximal nesting depth reached");
Ref<XML> xml = new XML;
xml->loc = cin->peek().Location();
/* parse tag opening */
if (cin->get() != Token::Sym("<")) THROW_RUNTIME_ERROR(cin->unget().Location().str()+": tag expected");
xml->name = cin->get().Identifier();
parseComments(cin);
while (cin->peek() != Token::Sym("/>") && cin->peek() != Token::Sym(">")) {
parseParm(cin,xml->parms);
parseComments(cin);
}
if (cin->peek() == Token::Sym("/>")) {
cin->drop();
return xml;
}
cin->drop();
/* parse body token list */
parseComments(cin);
while (cin->peek() != Token::Sym("<") && cin->peek() != Token::Sym("</")) {
xml->body.push_back(cin->get());
parseComments(cin);
}
/* the body also contains children */
if (cin->peek() == Token::Sym("<")) {
while (cin->peek() != Token::Sym("</")) {
xml->children.push_back(parseXML(cin,depth+1));
parseComments(cin);
}
}
/* parse tag closing */
if (cin->get() != Token::Sym("</") ) THROW_RUNTIME_ERROR(cin->unget().Location().str()+": symbol \"</\" expected");
if (cin->get() != Token::Id(xml->name)) THROW_RUNTIME_ERROR(cin->unget().Location().str()+": closing "+xml->name+" expected");
if (cin->get() != Token::Sym(">") ) THROW_RUNTIME_ERROR(cin->unget().Location().str()+": symbol \">\" expected");
return xml;
}
/* load XML from token stream */
Ref<XML> parseXML(Ref<Stream<int> > chars, std::string id, bool hasHeader = true, bool hasTail = false)
{
/* create lexer for XML file */
std::vector<std::string> symbols;
symbols.push_back("<!--");
symbols.push_back("-->");
symbols.push_back("<?");
symbols.push_back("?>");
symbols.push_back("</");
symbols.push_back("/>");
symbols.push_back("<");
symbols.push_back(">");
symbols.push_back("=");
Ref<Stream<Token> > cin = new TokenStream(chars,TokenStream::alpha + TokenStream::ALPHA + "_" + id, TokenStream::separators, symbols);
if (hasHeader) parseHeader(cin);
parseComments(cin);
Ref<XML> xml = parseXML(cin,0);
parseComments(cin);
if (!hasTail)
if (cin->peek() != Token::Eof()) THROW_RUNTIME_ERROR(cin->peek().Location().str()+": end of file expected");
return xml;
}
/*! load XML file from stream */
std::istream& operator>>(std::istream& cin, Ref<XML>& xml) {
xml = parseXML(new StdStream(cin),"",false,true);
return cin;
}
/*! load XML file from disk */
Ref<XML> parseXML(const FileName& fileName, std::string id, bool hasHeader) {
return parseXML(new FileStream(fileName),id,hasHeader,false);
}
//////////////////////////////////////////////////////////////////////////////
/// XML Output
//////////////////////////////////////////////////////////////////////////////
/* indent to some hierarchy level using spaces */
void indent(std::ostream& cout, size_t depth) {
for (size_t i=0; i<2*depth; i++) cout << " ";
}
/* store XML to a stream */
std::ostream& emitXML(std::ostream& cout, const Ref<XML>& xml, size_t depth = 0)
{
/* print header */
if (depth == 0) cout << "<?xml version=\"1.0\"?>" << std::endl << std::endl;
/* print tag opening */
indent(cout,depth); cout << "<" << xml->name;
for (std::map<std::string,std::string>::const_iterator i=xml->parms.begin(); i!=xml->parms.end(); i++)
cout << " " << i->first << "=" << "\"" << i->second << "\"";
if (xml->children.size() == 0 && xml->body.size() == 0) {
cout << "/>" << std::endl;
return cout;
}
cout << ">";
bool compact = xml->body.size() < 16 && xml->children.size() == 0;
if (!compact) cout << std::endl;
/* print token list */
if (xml->body.size()) {
if (!compact) indent(cout,depth+1);
for (size_t i=0; i<xml->body.size(); i++)
cout << xml->body[i] << (i!=xml->body.size()-1?" ":"");
if (!compact) cout << std::endl;
}
/* print children */
for (size_t i=0; i<xml->children.size(); i++)
emitXML(cout,xml->children[i],depth+1);
/* print tag closing */
if (!compact) indent(cout,depth);
return cout << "</" << xml->name << ">" << std::endl;
}
/* store XML to stream */
std::ostream& operator<<(std::ostream& cout, const Ref<XML>& xml) {
return emitXML(cout,xml);
}
/*! store XML to disk */
void emitXML(const FileName& fileName, const Ref<XML>& xml)
{
std::ofstream cout(fileName.c_str());
if (!cout.is_open()) THROW_RUNTIME_ERROR("cannot open file " + fileName.str() + " for writing");
emitXML(cout,xml);
cout.close();
}
}
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