// file      : libbuild2/build/script/parser.hxx -*- C++ -*-
// license   : MIT; see accompanying LICENSE file

#ifndef LIBBUILD2_BUILD_SCRIPT_PARSER_HXX
#define LIBBUILD2_BUILD_SCRIPT_PARSER_HXX

#include <libbuild2/types.hxx>
#include <libbuild2/forward.hxx>
#include <libbuild2/utility.hxx>

#include <libbuild2/diagnostics.hxx>

#include <libbuild2/script/parser.hxx>

#include <libbuild2/build/script/token.hxx>
#include <libbuild2/build/script/script.hxx>

namespace build2
{
  namespace build
  {
    namespace script
    {
      class runner;

      class parser: public build2::script::parser
      {
        // Pre-parse. Issue diagnostics and throw failed in case of an error.
        //
      public:
        parser (context& c): build2::script::parser (c) {}

        void
        pre_parse (istream&, const path_name&, uint64_t line, script&);

        // Recursive descent parser.
        //
        // Usually (but not always) parse functions receive the token/type
        // from which it should start consuming and in return the token/type
        // should contain the first token that has not been consumed.
        //
        // Functions that are called parse_*() rather than pre_parse_*() are
        // used for both stages.
        //
      protected:
        token
        pre_parse_script ();

        void
        pre_parse_line (token&, token_type&, bool if_line = false);

        void
        pre_parse_if_else (token&, token_type&);

        command_expr
        parse_command_line (token&, token_type&);

        // Workaround for GCC 4.9 that fails to compile the base class
        // protected member function call from a lambda defined in the derived
        // class.
        //
        using build2::parser::apply_value_attributes;

        // Execute. Issue diagnostics and throw failed in case of an error.
        //
      public:
        void
        execute (environment&, runner&);

      protected:
        void
        exec_script ();

        // Customization hooks.
        //
      protected:
        virtual lookup
        lookup_variable (name&&, string&&, const location&) override;

      protected:
        script* script_;

        // Execute state.
        //
        runner* runner_;
        environment* environment_;
      };
    }
  }
}

#endif // LIBBUILD2_BUILD_SCRIPT_PARSER_HXX