update sam docu

include/bio/format/sam_input_handler.hpp

@@ -35,22 +35,75 @@
 namespace bio
 {
 
+/*!\brief Format input handler for the SAM format (bio::sam).
+ * \ingroup format
+ * \details
+ *
+ * ### Attention
+ *
+ * Most users should not perform I/O through input/output handlers but should instead use the respective
+ * readers/writers. See the overview (TODO link) for more information.
+ *
+ * ### Options
+ *
+ * The following options are considered if the respective member variable is availabele in the object passed to
+ * the constructor:
+ *
+ * | Member          | Type    | Default | Description                                                      |
+ * |-----------------|---------|---------|------------------------------------------------------------------|
+ * |`print_warnings` |`bool`   | `false` | Whether to print non-critical warnings to seqan3::debug_stream   |
+ *
+ */
 template <>
 class format_input_handler<sam> : public format_input_handler_base<format_input_handler<sam>>
 {
 private:
-    /* CRTP */
+    /*!\name CRTP related entities
+     * \{
+     */
+    //!\brief The type of the CRTP base class.
     using base_t = format_input_handler_base<format_input_handler<sam>>;
+    using base_t::parse_field;
+    using base_t::parse_field_aux;
     using base_t::stream;
 
+    //!\brief Befriend the base class to enable CRTP.
     friend base_t;
+    //!\}
 
-    //!\brief Default field handlers.
-    using base_t::parse_field;
-    using base_t::parse_field_aux;
+    /*!\name Options
+     * \{
+     */
+    //!\brief Whether to print warnings or not.
+    bool print_warnings = true;
+    //!\}
+
+    //!\brief Throw a bio::format_error with an error message with current line number in diagnostic.
+    [[noreturn]] void error(auto const &... messages) const
+    {
+        std::string message = "[B.I.O sam format error in line " + detail::to_string(line) + "] ";
+        ((message += detail::to_string(messages)), ...);
+
+        throw format_error{message};
+    }
+
+    //!\brief Print a B.I.O warning message with current line number in diagnostic.
+    /* [[noreturn]] compiler says this returns something...? */ void warning(auto const &... messages) const
+    {
+        if (print_warnings)
+        {
+            seqan3::debug_stream << "[B.I.O sam format warning in line " << line << "] ";
+            (seqan3::debug_stream << ... << messages);
+            seqan3::debug_stream << std::endl;
+        }
+    }
 
-    /* RAW RECORD HANDLING*/
+    /*!\name Raw record handling
+     * \{
+     */
+    //!\brief The fields that this format supports [the base class accesses this type].
     using format_fields = decltype(map_io::default_field_ids);
+    //!\brief Type of the raw record.
     using raw_record_type = bio::record<format_fields,
                   seqan3::list_traits::repeat<format_fields::size, std::string_view>>;
 
@@ -69,27 +122,8 @@ class format_input_handler<sam> : public format_input_handler_base<format_input_
     int32_t           last_rname_idx = -1;
     //!\brief Current line number in file.
     size_t            line           = 0;
-    //!\brief Whether to print print_warnings or not.
-    bool              print_warnings = true;
-
-    [[noreturn]] void error(auto const &... messages) const
-    {
-        std::string message = "[B.I.O sam format error in line " + detail::to_string(line) + "] ";
-        ((message += detail::to_string(messages)), ...);
-
-        throw format_error{message};
-    }
-
-    /* [[noreturn]] compiler says this returns something...? */ void warning(auto const &... messages) const
-    {
-        if (print_warnings)
-        {
-            seqan3::debug_stream << "[B.I.O sam format warning in line " << line << "] ";
-            (seqan3::debug_stream << ... << messages);
-            seqan3::debug_stream << std::endl;
-        }
-    }
 
+    //!\brief Read the raw record [the base class invokes this function].
     void read_raw_record()
     {
         ++line;
@@ -116,9 +150,12 @@ class format_input_handler<sam> : public format_input_handler_base<format_input_
         // SAM tags go from end of qual til end of line (possibly empty)
         get<field::tags>(raw_record) = std::string_view{end_qual, static_cast<size_t>(end_line - end_qual)};
     }
+    //!\}
 
-    /* PARSED RECORD HANDLING */
-
+    /*!\name Parsed record handling
+     * \brief This is mostly done via the defaults in the base class.
+     * \{
+     */
     //!\brief Overload for parsing QNAME.
     template <typename parsed_field_t>
     void parse_field(vtag_t<field::qname> const & /**/, parsed_field_t & parsed_field)
@@ -264,18 +301,29 @@ class format_input_handler<sam> : public format_input_handler_base<format_input_
     {
         parsed_field = map_io::record_private_data{.header_ptr = &header};
     }
+    //!\}
 
 public:
-    format_input_handler()                             = default;
-    format_input_handler(format_input_handler const &) = delete;
-    format_input_handler(format_input_handler &&)      = default;
-    format_input_handler & operator=(format_input_handler const &) = delete;
-    format_input_handler & operator=(format_input_handler &&) = default;
-
+    /*!\name Constructors, destructor and assignment.
+     * \{
+     */
+    format_input_handler()                                         = default; //!< Defaulted.
+    format_input_handler(format_input_handler const &)             = delete;  //!< Deleted.
+    format_input_handler(format_input_handler &&)                  = default; //!< Defaulted.
+    ~format_input_handler()                                        = default; //!< Defaulted.
+    format_input_handler & operator=(format_input_handler const &) = delete;  //!< Deleted.
+    format_input_handler & operator=(format_input_handler &&)      = default; //!< Defaulted.
+
+    /*!\brief Construct with an options object.
+     * \param[in,out] str The input stream.
+     * \param[in] options An object with options for the input handler.
+     * \details
+     *
+     * The options argument is typically bio::map_io::reader_options, but any object with a subset of similarly named
+     * members is also accepted. See bio::format_input_handler<vcf> for the supported options and defaults.
+     */
     template <typename options_t>
-    format_input_handler(std::istream & str, options_t const & options) :
-        base_t{str},
-        file_it{str, false /*no_init!*/}
+    format_input_handler(std::istream & str, options_t const & options) : base_t{str}, file_it{str, false /*no_init!*/}
     {
         // extract options
         if constexpr (requires { (bool)options.print_warnings; })
@@ -296,6 +344,11 @@ class format_input_handler<sam> : public format_input_handler_base<format_input_
         header.read(header_string);
     }
 
+    //!\brief Construct with only an input stream.
+    format_input_handler(std::istream & str) : format_input_handler{str, int{}} {}
+    //!\}
+
+    //!\brief Return a reference to the header contained in the input handler.
     auto const & get_header() const { return header; }
 };