/*
 * Copyright (c) 2003-2013, John Wiegley.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of New Artisans LLC nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <system.hh>

#include "scope.h"

namespace ledger {

scope_t *       scope_t::default_scope = NULL;
empty_scope_t * scope_t::empty_scope   = NULL;

void symbol_scope_t::define(const symbol_t::kind_t kind,
                            const string& name, expr_t::ptr_op_t def)
{
  DEBUG("scope.symbols",
        "Defining '" << name << "' = " << def << " in " << this);

  if (! symbols)
    symbols = symbol_map();

  std::pair<symbol_map::iterator, bool> result
    = symbols->insert(symbol_map::value_type(symbol_t(kind, name, def), def));
  if (! result.second) {
    symbol_map::iterator i = symbols->find(symbol_t(kind, name));
    assert(i != symbols->end());
    symbols->erase(i);

    result = symbols->insert(symbol_map::value_type
                             (symbol_t(kind, name, def), def));
    if (! result.second)
      throw_(compile_error,
             _f("Redefinition of '%1%' in the same scope") % name);
  }
}

expr_t::ptr_op_t symbol_scope_t::lookup(const symbol_t::kind_t kind,
                                        const string& name)
{
  if (symbols) {
    DEBUG("scope.symbols", "Looking for '" << name << "' in " << this);
    symbol_map::const_iterator i = symbols->find(symbol_t(kind, name));
    if (i != symbols->end()) {
      DEBUG("scope.symbols", "Found '" << name << "' in " << this);
      return (*i).second;
    }
  }
  return child_scope_t::lookup(kind, name);
}

value_t& call_scope_t::resolve(const std::size_t index,
                               value_t::type_t   context,
                               const bool        required)
{
  if (index >= args.size())
    throw_(calc_error, _("Too few arguments to function"));

  value_t& value(args[index]);
  if (value.is_any()) {
    context_scope_t scope(*this, context, required);
    value = as_expr(value)->calc(scope, locus, depth);
    if (required && ! value.is_type(context))
      throw_(calc_error, _f("Expected %1% for argument %2%, but received %3%")
             % value.label(context) % index % value.label());
  }
  return value;
}

} // namespace ledger
