predicate.h

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/*
 * Copyright (c) 2003-2023, 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
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 *
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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#pragma once
 
#include "expr.h"
#include "commodity.h"
#include "annotate.h"
 
namespace ledger {
 
class predicate_t : public expr_t
{
public:
  keep_details_t what_to_keep;
 
  predicate_t(const keep_details_t& _what_to_keep = keep_details_t())
    : what_to_keep(_what_to_keep) {
    TRACE_CTOR(predicate_t, "");
  }
  predicate_t(const predicate_t& other)
    : expr_t(other), what_to_keep(other.what_to_keep) {
    TRACE_CTOR(predicate_t, "copy");
  }
  predicate_t(ptr_op_t              _ptr,
              const keep_details_t& _what_to_keep,
              scope_t *             _context = NULL)
    : expr_t(_ptr, _context), what_to_keep(_what_to_keep) {
    TRACE_CTOR(predicate_t, "ptr_op_t, keep_details_t, scope_t *");
  }
  predicate_t(const string&         str,
              const keep_details_t& _what_to_keep,
              const parse_flags_t&  flags = PARSE_DEFAULT)
    : expr_t(str, flags), what_to_keep(_what_to_keep) {
    TRACE_CTOR(predicate_t, "string, keep_details_t, parse_flags_t");
  }
  predicate_t(std::istream&         in,
              const keep_details_t& _what_to_keep,
              const parse_flags_t&  flags = PARSE_DEFAULT)
    : expr_t(in, flags), what_to_keep(_what_to_keep) {
    TRACE_CTOR(predicate_t, "std::istream&, keep_details_t, parse_flags_t");
  }
  virtual ~predicate_t() {
    TRACE_DTOR(predicate_t);
  }
 
  virtual value_t real_calc(scope_t& scope) {
    return (*this ?
            expr_t::real_calc(scope)
              .strip_annotations(what_to_keep)
              .to_boolean() :
            true);
  }
};
 
} // namespace ledger