#include <mapnik/config_error.hpp>
#include <mapnik/xml_tree.hpp>

namespace mapnik
{

config_error::config_error(std::string const& what)
    : what_(what), line_number_(0), file_(), node_name_(), msg_()
{
}


config_error::config_error(std::string const& what, xml_node const& node)
    : what_(what), line_number_(node.line()), file_(node.filename()), node_name_(node.name()), msg_()
{
}


config_error::config_error(std::string const& what, unsigned line_number, std::string const& filename)
    : what_(what), line_number_(line_number), file_(filename), node_name_(), msg_()
{

}

char const* config_error::what() const throw()
{
    std::stringstream s;
    s << what_;
    if (!node_name_.empty()) s << " in " << node_name_;
    if (line_number_ > 0) s << " at line " << line_number_;
    if (!file_.empty()) s << " of '" << file_ << "'";
    msg_ = s.str(); //Avoid returning pointer to dead object
    return msg_.c_str();
}

void config_error::append_context(std::string const& ctx) const
{
    what_ += " " + ctx;
}

void config_error::append_context(std::string const& ctx, xml_node const& node) const
{
    append_context(ctx);
    append_context(node);
}

void config_error::append_context(xml_node const& node) const
{
    if (!line_number_) line_number_ = node.line();
    if (node_name_.empty()) node_name_ = node.name();
    if (file_.empty()) file_ = node.filename();
}

}