cverb.cpp

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#include <cstring>

#include <fstream>
#include <iostream>
#include <map>
#include <string>
#include <cstring>

#include "cverb.h"

using namespace std;

cverb_object cverb;
verbose vlevel1("level1");
verbose vdebug("debug");
verbose vstats("stats");
verbose vsfile("sfile");
verbose varcs("arcs");
verbose vxml("xml");

namespace {

// The right way is to use: ofstream fout; but cverb(fout.rdbuf()) receive
// a null pointer and stl shipped with 2.91 segfault.
ofstream fout("/dev/null");
ostream null_stream(fout.rdbuf());

// Used to setup the bad bit in our null stream so output will fail earlier
// and overhead will be smaller.
struct setup_stream {
    setup_stream();
};

setup_stream::setup_stream()
{
    null_stream.clear(ios::badbit);
}

setup_stream setup;

// We use a multimap because user can create multiple verbose object with
// the same name, these are synonymous, setting up one to true will setup
// all with the same name to true.
typedef multimap<string, verbose *> recorder_t;
// The recorder is lazilly created by verbose object ctor
static recorder_t * object_map;

} // anonymous namespace


verbose::verbose(char const * name)
    :
    set(false)
{
    // all params is treated a part, there is no need to create a
    // verbose all("all"); it's meaningless. "all" verbose named object is
    // reserved.
    if (strcmp(name, "all") == 0)
        return;
    if (!object_map)
        object_map = new recorder_t;
    object_map->insert(recorder_t::value_type(name, this));
}


verbose verbose::operator|(verbose const & rhs)
{
    verbose result(*this);
    result.set = result.set || rhs.set;
    return result;
}


verbose verbose::operator&(verbose const & rhs)
{
    verbose result(*this);
    result.set = result.set && rhs.set;
    return result;
}


bool verbose::setup(string const & name)
{
    if (name == "all") {
        null_stream.rdbuf(cout.rdbuf());
        null_stream.clear();
        return true;
    }
    if (!object_map)
        object_map = new recorder_t;
    pair<recorder_t::iterator, recorder_t::iterator> p_it =
        object_map->equal_range(name);
    if (p_it.first == p_it.second)
        return false;
    for (; p_it.first != p_it.second; ++p_it.first)
        p_it.first->second->set = true;
    return true;
}


bool verbose::setup(vector<string> const & names)
{
    for (size_t i = 0; i < names.size(); ++i)
        if (!setup(names[i]))
            return false;
    return true;
}


ostream& operator<<(cverb_object &, verbose const & v)
{
    return v.set ? cout : null_stream;
}