file.cpp

赫赫大名的 OGRE 游戏引擎

#include <vrmllib/file.h>

#include <stdexcept>
#include <stack>
#include <algorithm>

#include <vrmllib/nodes.h>
#include "commentstream.h"

namespace vrmllib {
namespace {

void set_parent(std::vector<node *> &c, grouping_node *p)
{
	for (std::vector<node *>::iterator i=c.begin(); i!=c.end(); ++i) {
		if (!*i)
			continue;
		(*i)->parent = p;
		if (grouping_node *n = dynamic_cast<grouping_node *>(*i))
			set_parent(n->children, n);
	}
}

} // anonymous namespace

file::file(std::istream &sarg)
{
	utillib::commentstream s(sarg, '#', '\n');
	std::ios::iostate exceptions = sarg.exceptions();
	sarg.exceptions(std::ios::goodbit);

	try {
		for (;;) {
			char t;
			s >> t;
			if (s)
				s.putback(t);
			else if (s.eof())
				break;
			else
				throw std::runtime_error(
					"parse error: unexpected end of file");

			s.exceptions(std::ios::badbit
				| std::ios::failbit
				| std::ios::eofbit);

			std::string word;
			s >> word;

			if (word == "ROUTE") {
				s >> word;
				s >> word; // TO
				s >> word;
			} else {
				node *n = node::parse_node_xdef(s, *this, word);
				if (n)
					roots.push_back(n);
			}
			
			s.exceptions(std::ios::goodbit);
		}

	} catch (std::ios::failure &e) {
		sarg.exceptions(exceptions);
		throw std::runtime_error(std::string("parse error: stream failure: ") + e.what());
	} catch (...) {
		sarg.exceptions(exceptions);
		throw;
	}
	sarg.exceptions(exceptions);

	set_parent(roots, 0);
}

namespace {
	inline void delnode(node *n) { delete n; }
}

file::~file()
{
	std::for_each(nodes.begin(), nodes.end(), delnode);
}

} // namespace vrmllib