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| 26 | |
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| 27 | |
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| 28 | <A NAME="multichar"></A> |
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| 29 | <H2>2.2.8. Multi-Character Filters</H2> |
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| 30 | |
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| 31 | <P> |
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| 32 | All the Filters you've seen so far — except for those that derive from <CODE>stdio_filter</CODE> — process characters one at a time. If you instead process several characters at once, you can often reduce the number of function calls it takes to filter a character sequence, resulting in more efficient code. This is what <A HREF="../concepts/multi_character.html">Multi-Character Filters</A> allow us to do. |
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| 33 | </P> |
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| 34 | |
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| 35 | <A NAME="multichar_input_filters"></A> |
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| 36 | <H4>Multi-Character InputFilters</H4> |
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| 37 | |
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| 38 | <P>A typical narrow-character <A HREF="../concepts/multi_character.html">Multi-Character</A> <A HREF="../concepts/input_filter.html">InputFilter</A> looks like this:<P> |
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| 39 | |
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| 40 | <PRE CLASS="broken_ie"><SPAN CLASS='preprocessor'>#include</SPAN> <SPAN CLASS="literal"><iosfwd></SPAN> <SPAN CLASS='comment'>// streamsize</SPAN> |
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| 41 | <SPAN CLASS='preprocessor'>#include</SPAN> <A CLASS="HEADER" HREF="../../../../boost/iostreams/categories.hpp"><SPAN CLASS='literal'><boost/iostreams/categories.hpp></SPAN></A> <SPAN CLASS='comment'>// tags |
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| 42 | </SPAN> |
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| 43 | <SPAN CLASS='keyword'>class</SPAN> my_input_filter { |
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| 44 | <SPAN CLASS='keyword'>public</SPAN>: |
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| 45 | <SPAN CLASS='keyword'>typedef</SPAN> <SPAN CLASS='keyword'>char</SPAN> char_type; |
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| 46 | <SPAN CLASS='keyword'>struct</SPAN> category |
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| 47 | : input_filter_tag, |
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| 48 | multichar_tag |
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| 49 | { }; |
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| 50 | |
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| 51 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Source> |
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| 52 | std::streamsize read(Source& src, <SPAN CLASS='keyword'>char</SPAN>* s, std::streamsize n) |
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| 53 | { |
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| 54 | <SPAN CLASS='comment'>// Read up to n filtered characters into the buffer s,</SPAN> |
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| 55 | <SPAN CLASS='comment'>// returning the number of characters read or -1 for EOF.</SPAN> |
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| 56 | <SPAN CLASS='comment'>// Use src to access the unfiltered character sequence</SPAN> |
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| 57 | } |
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| 58 | |
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| 59 | <SPAN CLASS='comment'>/* Other members */</SPAN> |
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| 60 | };</PRE> |
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| 61 | |
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| 62 | <P> |
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| 63 | Notice that the member type category is a <CODE>struct</CODE> convertible to <CODE>input_filter_tag</CODE> and to <CODE>multichar_tag</CODE>. This tells the Iostream library that <CODE>my_input_filter</CODE> is a <A HREF="../concepts/multi_character.html">Multi-Character Filter</A> and an <A HREF="../concepts/input_filter.html">InputFilter</A>. You could have achieved the same effect several ways. <I>E.g.</I>, |
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| 64 | </P> |
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| 65 | |
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| 66 | <PRE CLASS="broken_ie"> <SPAN CLASS='keyword'>struct</SPAN> category |
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| 67 | : input, |
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| 68 | filter_tag, |
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| 69 | multichar_tag |
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| 70 | { }; |
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| 71 | |
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| 72 | <SPAN CLASS='comment'>/* or */</SPAN> |
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| 73 | |
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| 74 | <SPAN CLASS='keyword'>typedef</SPAN> multichar_input_filter_tag category;</PRE> |
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| 75 | |
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| 76 | <P>(For details, <I>see</I> <A HREF="../guide/modes.html#mode_tags">Mode Tags</A> and <A HREF="../guide/traits.html#category_tags">Category Tags</A>.) |
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| 77 | |
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| 78 | <P> You could also write the above example as follows:</P> |
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| 79 | |
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| 80 | <PRE CLASS="broken_ie"><SPAN CLASS='preprocessor'>#include</SPAN> <SPAN CLASS="literal"><iosfwd></SPAN> <SPAN CLASS='comment'>// streamsize</SPAN> |
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| 81 | <SPAN CLASS='preprocessor'>#include</SPAN> <A CLASS="HEADER" HREF="../../../../boost/iostreams/concepts.hpp"><SPAN CLASS='literal'><boost/iostreams/concepts.hpp></SPAN></A> <SPAN CLASS='comment'>// multichar_input_filter</SPAN> |
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| 82 | |
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| 83 | <SPAN CLASS='keyword'>class</SPAN> my_input_filter : <SPAN CLASS='keyword'>public</SPAN> multichar_input_filter { |
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| 84 | <SPAN CLASS='keyword'>public</SPAN>: |
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| 85 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Source> |
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| 86 | std::streamsize read(<SPAN CLASS='keyword'>char</SPAN>* s, std::streamsize n); |
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| 87 | |
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| 88 | <SPAN CLASS='comment'>/* Other members */</SPAN> |
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| 89 | };</PRE> |
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| 90 | |
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| 91 | <P>Here <A HREF="../classes/filter.html#synopsis"><CODE>multichar_input_filter</CODE></A> is a convenience base class which provides the member types <CODE>char_type</CODE> and <CODE>category</CODE>, as well as no-op implementations of member functions <CODE>close</CODE> and <CODE>imbue</CODE>. |
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| 92 | |
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| 93 | <A NAME="shell_comments_multichar_input_filter"></A> |
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| 94 | <H4><CODE>shell_comments_multichar_input_filter</CODE></H4> |
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| 95 | |
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| 96 | <P>You can express a <A HREF="shell_comments_filters.html">shell comments Filter</A> as an <A HREF="../concepts/multi_character.html">Multi-Character</A> <A HREF="../concepts/input_filter.html">InputFilter</A> as follows:</P> |
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| 97 | |
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| 98 | <PRE CLASS="broken_ie"><SPAN CLASS='preprocessor'>#include</SPAN> <A CLASS="header" HREF="../../../../boost/iostreams/char_traits.hpp"><SPAN CLASS="literal"><boost/iostreams/char_traits.hpp></SPAN></A> <SPAN CLASS="comment">// EOF, WOULD_BLOCK</SPAN> |
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| 99 | <SPAN CLASS='preprocessor'>#include</SPAN> <A CLASS="header" HREF="../../../../boost/iostreams/concepts.hpp"><SPAN CLASS="literal"><boost/iostreams/concepts.hpp></SPAN></A> <SPAN CLASS="comment">// multichar_input_filter</SPAN> |
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| 100 | <SPAN CLASS='preprocessor'>#include</SPAN> <A CLASS="header" HREF="../../../../boost/iostreams/operations.hpp"><SPAN CLASS="literal"><boost/iostreams/operations.hpp></SPAN></A> <SPAN CLASS="comment">// get</SPAN> |
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| 101 | |
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| 102 | <SPAN CLASS='keyword'>namespace</SPAN> boost { <SPAN CLASS='keyword'>namespace</SPAN> iostreams { <SPAN CLASS='keyword'>namespace</SPAN> example { |
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| 103 | |
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| 104 | <SPAN CLASS="keyword">class</SPAN> shell_comments_multichar_input_filter : <SPAN CLASS="keyword">public</SPAN> multichar_input_filter { |
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| 105 | <SPAN CLASS="keyword">public</SPAN>: |
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| 106 | <SPAN CLASS="keyword">explicit</SPAN> shell_comments_multichar_input_filter(<SPAN CLASS="keyword">char</SPAN> comment_char = '#') |
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| 107 | : comment_char_(comment_char), skip_(<SPAN CLASS="keyword">false</SPAN>) |
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| 108 | { } |
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| 109 | |
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| 110 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Source> |
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| 111 | std::streamsize read(Source& src, <SPAN CLASS="keyword">char</SPAN>* s, std::streamsize n) |
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| 112 | { |
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| 113 | <SPAN CLASS="keyword">for</SPAN> (std::streamsize z = <SPAN CLASS='numeric_literal'>0</SPAN>; z < n; ++z) { |
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| 114 | <SPAN CLASS="keyword">int</SPAN> c; |
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| 115 | <SPAN CLASS="keyword">while</SPAN> (true) { |
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| 116 | <SPAN CLASS="keyword">if</SPAN> ((c = boost::iostreams::get(src)) == <SPAN CLASS='numeric_literal'>EOF</SPAN>) |
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| 117 | <SPAN CLASS="keyword">return</SPAN> z != <SPAN CLASS='numeric_literal'>0</SPAN> ? z : <SPAN CLASS='numeric_literal'>-1</SPAN>; |
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| 118 | <SPAN CLASS="keyword">else</SPAN> <SPAN CLASS="keyword">if</SPAN> (c == WOULD_BLOCK) |
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| 119 | <SPAN CLASS="keyword">return</SPAN> z; |
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| 120 | skip_ = c == comment_char_ ? |
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| 121 | <SPAN CLASS="keyword">true</SPAN> : |
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| 122 | c == '\n' ? |
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| 123 | <SPAN CLASS="keyword">false</SPAN> : |
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| 124 | skip_; |
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| 125 | <SPAN CLASS="keyword">if</SPAN> (!skip_) |
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| 126 | <SPAN CLASS="keyword">break</SPAN>; |
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| 127 | } |
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| 128 | s[z] = c; |
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| 129 | } |
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| 130 | <SPAN CLASS="keyword">return</SPAN> n; |
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| 131 | } |
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| 132 | |
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| 133 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Source> |
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| 134 | <SPAN CLASS="keyword">void</SPAN> close(Source&) { skip_ = false; } |
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| 135 | <SPAN CLASS="keyword">private</SPAN>: |
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| 136 | <SPAN CLASS="keyword">char</SPAN> comment_char_; |
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| 137 | <SPAN CLASS="keyword">bool</SPAN> skip_; |
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| 138 | }; |
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| 139 | |
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| 140 | } } } <SPAN CLASS="comment">// End namespace boost::iostreams:example</SPAN></PRE> |
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| 141 | |
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| 142 | <P> |
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| 143 | Note that the implementation of <CODE>read</CODE> is very similar to what you would get if you put the implementation of <A HREF="shell_comments_filters.html#shell_comments_input_filter"><CODE>shell_comments_input_filter::get</CODE></A> inside a <CODE>for</CODE> loop iterating from <CODE>0</CODE> to <CODE>n</CODE>. InputFilters which call themselves recursively, such as <A HREF="tab_expanding_filters.html#tab_expanding_input_filter"><CODE>tab_expanding_input_filter</CODE></A>, are much harder to transform into Multi-Character filters. |
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| 144 | </P> |
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| 145 | |
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| 146 | <A NAME="multichar_output_filters"></A> |
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| 147 | <H4>Multi-Character OutputFilters</H4> |
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| 148 | |
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| 149 | <P>A typical narrow-character <A HREF="../concepts/multi_character.html">Multi-Character</A> <A HREF="../concepts/output_filter.html">OutputFilter</A> looks like this:<P> |
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| 150 | |
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| 151 | <PRE CLASS="broken_ie"><SPAN CLASS='preprocessor'>#include</SPAN> <SPAN CLASS="literal"><iosfwd></SPAN> <SPAN CLASS='comment'>// streamsize</SPAN> |
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| 152 | <SPAN CLASS='preprocessor'>#include</SPAN> <A CLASS="HEADER" HREF="../../../../boost/iostreams/categories.hpp"><SPAN CLASS='literal'><boost/iostreams/categories.hpp></SPAN></A> <SPAN CLASS='comment'>// tags |
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| 153 | </SPAN> |
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| 154 | <SPAN CLASS='keyword'>class</SPAN> my_output_filter { |
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| 155 | <SPAN CLASS='keyword'>public</SPAN>: |
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| 156 | <SPAN CLASS='keyword'>typedef</SPAN> <SPAN CLASS='keyword'>char</SPAN> char_type; |
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| 157 | <SPAN CLASS='keyword'>struct</SPAN> category |
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| 158 | : output_filter_tag, |
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| 159 | multichar_tag |
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| 160 | { }; |
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| 161 | |
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| 162 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Sink> |
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| 163 | std::streamsize write(Sink& dest, <SPAN CLASS='keyword'>const</SPAN> <SPAN CLASS='keyword'>char</SPAN>* s, std::streamsize n) |
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| 164 | { |
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| 165 | <SPAN CLASS='comment'>// Consume up to n filtered characters from the buffer s,</SPAN> |
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| 166 | <SPAN CLASS='comment'>// writing filtered characters to dest. Return the number</SPAN> |
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| 167 | <SPAN CLASS='comment'>// of characters consumed.</SPAN> |
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| 168 | } |
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| 169 | |
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| 170 | <SPAN CLASS='comment'>/* Other members */</SPAN> |
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| 171 | };</PRE> |
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| 172 | |
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| 173 | <P> |
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| 174 | Notice that the member type category is a <CODE>struct</CODE> convertible to <CODE>keyword</CODE> and to <CODE>multichar_tag</CODE>. This tells the Iostream library that <CODE>my_output_filter</CODE> is a <A HREF="../concepts/multi_character.html">Multi-Character Filter</A> and an <A HREF="../concepts/output_filter.html">OutputFilter</A>. As with <A HREF="../concepts/multi_character.html">Multi-Character</A> <A HREF="../concepts/input_filter.html">InputFilters</A>, you could have achieved the same effect several different ways. <I>E.g.</I>, |
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| 175 | </P> |
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| 176 | |
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| 177 | <PRE CLASS="broken_ie"> <SPAN CLASS='keyword'>struct</SPAN> category |
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| 178 | : output, |
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| 179 | filter_tag, |
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| 180 | multichar_tag |
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| 181 | { }; |
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| 182 | |
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| 183 | <SPAN CLASS='comment'>/* or */</SPAN> |
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| 184 | |
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| 185 | <SPAN CLASS='keyword'>typedef</SPAN> multichar_output_filter_tag category;</PRE> |
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| 186 | |
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| 187 | <P>(For details, <I>see</I> <A HREF="../guide/modes.html#mode_tags">Mode Tags</A> and <A HREF="../guide/traits.html#category_tags">Category Tags</A>.) |
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| 188 | |
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| 189 | <P> You could also write the above example as follows:</P> |
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| 190 | |
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| 191 | <PRE CLASS="broken_ie"><SPAN CLASS='preprocessor'>#include</SPAN> <SPAN CLASS="literal"><iosfwd></SPAN> <SPAN CLASS='comment'>// streamsize</SPAN> |
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| 192 | <SPAN CLASS='preprocessor'>#include</SPAN> <A CLASS="HEADER" HREF="../../../../boost/iostreams/concepts.hpp"><SPAN CLASS='literal'><boost/iostreams/concepts.hpp></SPAN></A> <SPAN CLASS='comment'>// multichar_output_filter</SPAN> |
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| 193 | |
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| 194 | <SPAN CLASS='keyword'>class</SPAN> my_output_filter : <SPAN CLASS='keyword'>public</SPAN> multichar_output_filter { |
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| 195 | <SPAN CLASS='keyword'>public</SPAN>: |
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| 196 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Sink> |
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| 197 | std::streamsize write(Sink& dest, <SPAN CLASS='keyword'>const</SPAN> <SPAN CLASS='keyword'>char</SPAN>* s, std::streamsize n); |
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| 198 | |
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| 199 | <SPAN CLASS='comment'>/* Other members */</SPAN> |
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| 200 | };</PRE> |
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| 201 | |
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| 202 | <P>Here <A HREF="../classes/filter.html#synopsis"><CODE>multichar_output_filter</CODE></A> is a convenience base class which provides the member types <CODE>char_type</CODE> and <CODE>category</CODE>, as well as no-op implementations of member functions <CODE>close</CODE> and <CODE>imbue</CODE>. |
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| 203 | |
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| 204 | <A NAME="shell_comments_multichar_ouput_filter"></A> |
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| 205 | <H4><CODE>shell_comments_multichar_output_filter</CODE></H4> |
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| 206 | |
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| 207 | <P>You can express a <A HREF="shell_comments_filters.html">shell comments Filter</A> as an <A HREF="../concepts/multi_character.html">Multi-Character</A> <A HREF="../concepts/output_filter.html">OutputFilter</A> as follows:</P> |
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| 208 | |
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| 209 | <PRE CLASS="broken_ie"><SPAN CLASS='preprocessor'>#include</SPAN> <A CLASS="header" HREF="../../../../boost/iostreams/char_traits.hpp"><SPAN CLASS="literal"><boost/iostreams/char_traits.hpp></SPAN></A> <SPAN CLASS="comment">// EOF, WOULD_BLOCK</SPAN> |
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| 210 | <SPAN CLASS='preprocessor'>#include</SPAN> <A CLASS="header" HREF="../../../../boost/iostreams/concepts.hpp"><SPAN CLASS="literal"><boost/iostreams/concepts.hpp></SPAN></A> <SPAN CLASS="comment">// multichar_output_filter</SPAN> |
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| 211 | <SPAN CLASS='preprocessor'>#include</SPAN> <A CLASS="header" HREF="../../../../boost/iostreams/operations.hpp"><SPAN CLASS="literal"><boost/iostreams/operations.hpp></SPAN></A> <SPAN CLASS="comment">// get</SPAN> |
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| 212 | |
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| 213 | <SPAN CLASS='keyword'>namespace</SPAN> boost { <SPAN CLASS='keyword'>namespace</SPAN> iostreams { <SPAN CLASS='keyword'>namespace</SPAN> example { |
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| 214 | |
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| 215 | <SPAN CLASS="keyword">class</SPAN> shell_comments_multichar_output_filter : <SPAN CLASS="keyword">public</SPAN> multichar_output_filter { |
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| 216 | <SPAN CLASS="keyword">public</SPAN>: |
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| 217 | <SPAN CLASS="keyword">explicit</SPAN> shell_comments_multichar_output_filter(<SPAN CLASS="keyword">char</SPAN> comment_char = '#') |
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| 218 | : comment_char_(comment_char), skip_(<SPAN CLASS="keyword">false</SPAN>) |
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| 219 | { } |
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| 220 | |
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| 221 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Sink> |
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| 222 | std::streamsize write(Sink& dest, <SPAN CLASS="keyword">const</SPAN> char* s, std::streamsize n) |
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| 223 | { |
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| 224 | std::streamsize z; |
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| 225 | <SPAN CLASS="keyword">for</SPAN> (z = <SPAN CLASS='numeric_literal'>0</SPAN>; z < n; ++z) { |
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| 226 | <SPAN CLASS="keyword">int</SPAN> c = s[z]; |
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| 227 | skip_ = c == comment_char_ ? |
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| 228 | <SPAN CLASS="keyword">true</SPAN> : |
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| 229 | c == <SPAN CLASS='literal'>'\n'</SPAN> ? |
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| 230 | <SPAN CLASS="keyword">false</SPAN> : |
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| 231 | skip_; |
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| 232 | <SPAN CLASS="keyword">if</SPAN> (skip_) |
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| 233 | <SPAN CLASS="keyword">continue</SPAN>; |
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| 234 | <SPAN CLASS="keyword">if</SPAN> (!iostreams::put(dest, c)) |
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| 235 | <SPAN CLASS="keyword">break</SPAN>; |
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| 236 | } |
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| 237 | <SPAN CLASS="keyword">return</SPAN> z; |
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| 238 | } |
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| 239 | |
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| 240 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Source> |
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| 241 | <SPAN CLASS="keyword">void</SPAN> close(Source&) { skip_ = <SPAN CLASS="keyword">false</SPAN>; } |
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| 242 | <SPAN CLASS="keyword">private</SPAN>: |
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| 243 | <SPAN CLASS="keyword">char</SPAN> comment_char_; |
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| 244 | <SPAN CLASS="keyword">bool</SPAN> skip_; |
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| 245 | }; |
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| 246 | |
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| 247 | } } } <SPAN CLASS="comment">// End namespace boost::iostreams:example</SPAN></PRE> |
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| 248 | |
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| 249 | <P> |
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| 250 | Note that the implementation of <CODE>write</CODE> is very similar to what you would get if you put the implementation of <A HREF="shell_comments_filters.html#shell_comments_output_filter"><CODE>shell_comments_output_filter::put</CODE></A> inside a <CODE>for</CODE> loop iterating from <CODE>0</CODE> to <CODE>n</CODE>. OutputFilters which call themselves recursively, such as <A HREF="unix2dos_filters.html#unix2dos_output_filter"><CODE>unix2dos_output_filter</CODE></A>, are much harder to transform into Multi-Character filters. |
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| 251 | </P> |
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| 252 | |
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| 253 | <!-- Begin Nav --> |
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| 254 | |
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| 255 | <DIV CLASS='nav'> |
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| 256 | <A HREF='unix2dos_filters.html'><IMG BORDER=0 WIDTH=19 HEIGHT=19 SRC='../../../../doc/html/images/prev.png'></A> |
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| 257 | <A HREF='tutorial.html'><IMG BORDER=0 WIDTH=19 HEIGHT=19 SRC='../../../../doc/html/images/up.png'></A> |
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| 258 | <A HREF='dual_use_filters.html'><IMG BORDER=0 WIDTH=19 HEIGHT=19 SRC='../../../../doc/html/images/next.png'></A> |
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| 259 | </DIV> |
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| 260 | |
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| 261 | <!-- End Nav --> |
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| 262 | |
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| 263 | <!-- Begin Footer --> |
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| 264 | |
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| 265 | <HR> |
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| 266 | |
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| 267 | <P CLASS="copyright">Revised |
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| 268 | <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan --> |
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| 269 | 20 May, 2004 |
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| 270 | <!--webbot bot="Timestamp" endspan i-checksum="38504" --> |
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| 271 | </P> |
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| 272 | |
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| 273 | <P CLASS="copyright">© Copyright <A HREF="http://www.kangaroologic.com" TARGET="_top">Jonathan Turkanis</A>, 2004</P> |
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| 274 | <P CLASS="copyright"> |
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| 275 | Use, modification, and distribution are subject to the Boost Software License, Version 2.0. (See accompanying file <A HREF="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</A> or copy at <A HREF="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>) |
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| 276 | </P> |
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| 277 | <!-- End Footer --> |
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| 279 | </BODY> |
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