build/variable.cxx


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// file      : build/variable.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license   : MIT; see accompanying LICENSE file

#include <build/variable>

#include <build/utility>

using namespace std;

namespace build
{
  variable_set variable_pool;

  // value_proxy
  //
  template <>
  string& value_proxy::
  as<string&> () const
  {
    list_value& lv (as<list_value&> ());
    assert (lv.size () == 1);
    name& n (lv.front ());
    assert (n.simple ());
    return n.value;
  }

  template <>
  const string& value_proxy::
  as<const string&> () const
  {
    const list_value& lv (as<list_value&> ());
    assert (lv.size () < 2);

    if (lv.empty ())
      return empty_string;

    const name& n (lv.front ());

    assert (n.simple ());
    return n.value;
  }

  template <>
  dir_path& value_proxy::
  as<dir_path&> () const
  {
    list_value& lv (as<list_value&> ());
    assert (lv.size () == 1);
    name& n (lv.front ());
    assert (n.directory ());
    return n.dir;
  }

  template <>
  const dir_path& value_proxy::
  as<const dir_path&> () const
  {
    const list_value& lv (as<list_value&> ());
    assert (lv.size () < 2);

    if (lv.empty ())
      return empty_dir_path;

    const name& n (lv.front ());

    if (n.empty ())
      return empty_dir_path;

    assert (n.directory ());
    return n.dir;
  }

  template <>
  bool value_proxy::
  as<bool> () const
  {
    const list_value& lv (as<const list_value&> ());
    assert (lv.size () == 1);
    const name& n (lv.front ());
    assert (n.simple ());
    if (n.value == "true")
      return true;
    else if (n.value == "false")
      return false;
    else
      assert (false); // Bool value should be 'true' or 'false'.
  }
}