// file      : build2/test/script/regex -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license   : MIT; see accompanying LICENSE file

#ifndef BUILD2_TEST_SCRIPT_REGEX
#define BUILD2_TEST_SCRIPT_REGEX

#include <regex>

#include <build2/types>
#include <build2/utility>

namespace build2
{
  namespace test
  {
    namespace script
    {
      // @@ How can we get the position the first line_char in the output that
      //    did not match, for diagnostics? Failed that it will be very hard
      //    to debug match failures.
      //

      using char_string = std::basic_string<char>;
      using char_regex = std::basic_regex<char>;

      // Newlines are line separators and are not part of the line:
      //
      // line<newline>line<newline>
      //
      // Specifically, this means that a customary trailing newline creates a
      // trailing blank line.
      //
      // Special characters should only be compared to special. All others
      // can inter-compare (though there cannot be regex characters in the
      // output, only in line_regex).
      //
      enum class line_type
      {
        blank,
        special,
        literal,
        regex
      };

      struct line_char
      {
        line_type type;

        union
        {                       // Uninitialized if type is blank.
          char special;         // [()|*+?{\}0123456789,=!] (excluding []).
          char_string literal;
          char_regex regex;
        };
      };

      // Note: line_string is not NUL-terminated.
      //
      using line_string = vector<line_char>;

      class line_regex: public std::basic_regex<line_char>
      {
      public:
        using base_type = std::basic_regex<line_char>;

        using base_type::base_type;

        explicit
        line_regex (const line_string&);
      };
    }
  }
}

#endif // BUILD2_TEST_SCRIPT_REGEX