#include "sass.hpp"

#include "ast.hpp"

#include "to_value.hpp"

namespace Sass {

  Value_Ptr To_Value::fallback_impl(AST_Node_Ptr n)

  {

    // throw a runtime error if this happens

    // we want a well defined set of possible nodes

    throw std::runtime_error("invalid node for to_value");

  }

  // Custom_Error is a valid value

  Value_Ptr To_Value::operator()(Custom_Error_Ptr e)

  {

    return e;

  }

  // Custom_Warning is a valid value

  Value_Ptr To_Value::operator()(Custom_Warning_Ptr w)

  {

    return w;

  }

  // Boolean is a valid value

  Value_Ptr To_Value::operator()(Boolean_Ptr b)

  {

    return b;

  }

  // Number is a valid value

  Value_Ptr To_Value::operator()(Number_Ptr n)

  {

    return n;

  }

  // Color is a valid value

  Value_Ptr To_Value::operator()(Color_Ptr c)

  {

    return c;

  }

  // String_Constant is a valid value

  Value_Ptr To_Value::operator()(String_Constant_Ptr s)

  {

    return s;

  }

  // String_Quoted is a valid value

  Value_Ptr To_Value::operator()(String_Quoted_Ptr s)

  {

    return s;

  }

  // List is a valid value

  Value_Ptr To_Value::operator()(List_Ptr l)

  {

    List_Obj ll = SASS_MEMORY_NEW(List,

                               l->pstate(),

                               l->length(),

                               l->separator(),

                               l->is_arglist());

    for (size_t i = 0, L = l->length(); i < L; ++i) {

      ll->append((*l)[i]->perform(this));

    }

    return ll.detach();

  }

  // Map is a valid value

  Value_Ptr To_Value::operator()(Map_Ptr m)

  {

    return m;

  }

  // Null is a valid value

  Value_Ptr To_Value::operator()(Null_Ptr n)

  {

    return n;

  }

  // Argument returns its value

  Value_Ptr To_Value::operator()(Argument_Ptr arg)

  {

    if (!arg->name().empty()) return 0;

    return arg->value()->perform(this);

  }

  // Selector_List is converted to a string

  Value_Ptr To_Value::operator()(Selector_List_Ptr s)

  {

    return SASS_MEMORY_NEW(String_Quoted,

                           s->pstate(),

                           s->to_string(ctx.c_options));

  }

  // Binary_Expression is converted to a string

  Value_Ptr To_Value::operator()(Binary_Expression_Ptr s)

  {

    return SASS_MEMORY_NEW(String_Quoted,

                           s->pstate(),

                           s->to_string(ctx.c_options));

  }

};