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27 | <A NAME="tab_expanding"></A> |
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28 | <H2>2.2.5. Tab-Expanding Filters</H2> |
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29 | |
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30 | <P> |
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31 | Suppose you want to write a filter which replaces each tab character with one or more space characters in such a way that the document appears unchanged when displayed. The basic algorithm is as follows: You examine characters one at a time, forwarding them <I>as-is</I> and keeping track of the current column number. When you encounter a tab character, you replace it with a sequence of space characters whose length depends on the current column count. When you encounter a newline character, you forward it and reset the column count. |
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32 | </P> |
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33 | |
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34 | <P> |
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35 | In the next three sections, I'll express this algorithm as a <A HREF="../classes/stdio_filter.html"><CODE>stdio_filter</CODE></A>, an <A HREF="../concepts/input_filter.html">InputFilter</A> and an <A HREF="../concepts/output_filter.html">OutputFilter</A>. The source code can be found in the header <A HREF="../../example/tab_expanding_filter.hpp"><CODE><libs/iostreams/example/tab_expanding_filter.hpp></CODE></A>. These examples were inspired by James Kanze's <CODE>ExpandTabsInserter.hh</CODE> (<I>see</I> <A CLASS="bib_ref" HREF="../bibliography.html#kanze">[Kanze]</A>). |
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36 | </P> |
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37 | |
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38 | <A NAME="tab_expanding_stdio_filter"></A> |
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39 | <H4><CODE>tab_expanding_stdio_filter</CODE></H4> |
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40 | |
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41 | <P>You can express a tab-expanding Filter as a <A HREF="../classes/stdio_filter.html"><CODE>stdio_filter</CODE></A> as follows:</P> |
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42 | |
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43 | <PRE class="broken_ie"><SPAN CLASS='preprocessor'>#include</SPAN> <SPAN CLASS="literal"><cstdio></SPAN> <SPAN CLASS="comment">// EOF</SPAN> |
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44 | <SPAN CLASS="preprocessor">#include</SPAN> <SPAN CLASS="literal"><iostream></SPAN> <SPAN CLASS="comment">// cin, cout</SPAN> |
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45 | <SPAN CLASS="preprocessor">#include</SPAN> <A CLASS="header" HREF="../../../../boost/iostreams/filter/stdio.hpp"><SPAN CLASS="literal"><boost/iostreams/filter/stdio.hpp></SPAN></A> |
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46 | |
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47 | <SPAN CLASS="keyword">class</SPAN> tab_expanding_stdio_filter : <SPAN CLASS="keyword"><SPAN CLASS="keyword"><SPAN CLASS="keyword">public</SPAN></SPAN></SPAN> stdio_filter { |
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48 | <SPAN CLASS="keyword">public</SPAN>: |
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49 | explicit tab_expanding_stdio_filter(<SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> tab_size = 8) |
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50 | : tab_size_(tab_size), col_no_(0) |
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51 | { |
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52 | assert(tab_size > 0); |
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53 | } |
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54 | <SPAN CLASS="keyword">private</SPAN>: |
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55 | <SPAN CLASS="keyword">void</SPAN> do_filter(); |
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56 | <SPAN CLASS="keyword">void</SPAN> do_close(); |
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57 | <SPAN CLASS="keyword">void</SPAN> put_char(<SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> c); |
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58 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> tab_size_; |
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59 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> col_no_; |
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60 | }; |
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61 | |
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62 | } } } <SPAN CLASS="comment">// End namespace boost::iostreams:example</SPAN></PRE> |
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63 | |
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64 | <P>The helper function <CODE>put_char</CODE> is identical to <A HREF="line_wrapping_filters.html#line_wrapping_stdio_filter"><CODE>line_wrapping_stdio_filter::put_char</CODE></A>. It writes a character to <CODE>std::cout</CODE> and updates the column count:</P> |
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65 | |
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66 | <PRE class="broken_ie"> <SPAN CLASS="keyword">void</SPAN> put_char(<SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> c) |
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67 | { |
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68 | std::cout.put(c); |
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69 | <SPAN CLASS="keyword">if</SPAN> (c == <SPAN CLASS="literal">'\n'</SPAN>) { |
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70 | col_no_ = 0; |
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71 | } <SPAN CLASS="keyword">else</SPAN> { |
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72 | ++col_no_; |
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73 | } |
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74 | }</PRE> |
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75 | |
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76 | <P>Using <CODE>put_char</CODE> you can implement <CODE>do_filter</CODE> as follows:</P> |
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77 | |
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78 | <PRE class="broken_ie"> <SPAN CLASS="keyword">void</SPAN> do_filter() |
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79 | { |
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80 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> c; |
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81 | <SPAN CLASS="keyword">while</SPAN> ((c = std::cin.get()) != <SPAN CLASS="numeric_literal">EOF</SPAN>) { |
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82 | <SPAN CLASS="keyword">if</SPAN> (c == '\t') { |
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83 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> spaces = tab_size_ - (col_no_ % tab_size_); |
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84 | for (; spaces > 0; --spaces) |
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85 | put_char(' '); |
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86 | } <SPAN CLASS="keyword">else</SPAN> { |
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87 | put_char(c); |
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88 | } |
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89 | } |
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90 | }</PRE> |
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91 | |
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92 | <P>The <CODE>while</CODE> loop reads a character from <CODE>std::cin</CODE> and writes it to <CODE>std::cout</CODE>, unless it is a tab character, in which case it writes an appropriate number of space characters to <CODE>std::cout</CODE>.</P> |
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93 | |
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94 | <P>As with <A HREF="line_wrapping_filters.html#line_wrapping_stdio_filter"><CODE>line_wrapping_stdio_filter</CODE></A>, the <CODE>virtual</CODE> function <CODE>do_close</CODE> resets the Filter's state:</P> |
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95 | |
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96 | <PRE class="broken_ie"> <SPAN CLASS="keyword">void</SPAN> do_close() { col_no_ = 0; }</PRE> |
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97 | |
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98 | <A NAME="tab_expanding_input_filter"></A> |
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99 | <H4><CODE>tab_expanding_input_filter</CODE></H4> |
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100 | |
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101 | <P>You can express a tab-expanding Filter as an <A HREF="../concepts/input_filter.html">InputFilter</A> as follows:</P> |
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102 | |
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103 | <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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104 | <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">// input_filter</SPAN> |
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105 | <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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106 | |
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107 | <SPAN CLASS='keyword'>namespace</SPAN> boost { <SPAN CLASS='keyword'>namespace</SPAN> iostreams { <SPAN CLASS='keyword'>namespace</SPAN> example { |
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108 | |
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109 | <SPAN CLASS="keyword">class</SPAN> tab_expanding_input_filter : <SPAN CLASS="keyword"><SPAN CLASS="keyword"><SPAN CLASS="keyword">public</SPAN></SPAN></SPAN> input_filter { |
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110 | <SPAN CLASS="keyword">public</SPAN>: |
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111 | explicit tab_expanding_input_filter(<SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> tab_size = 8) |
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112 | : tab_size_(tab_size), col_no_(0), spaces_(0) |
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113 | { |
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114 | assert(tab_size > 0); |
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115 | } |
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116 | |
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117 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Source> |
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118 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> get(Source& src); |
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119 | |
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120 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Source> |
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121 | <SPAN CLASS="keyword">void</SPAN> close(Source&); |
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122 | <SPAN CLASS="keyword">private</SPAN>: |
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123 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> get_char(<SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> c); |
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124 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> tab_size_; |
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125 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> col_no_; |
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126 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> spaces_; |
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127 | }; |
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128 | |
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129 | } } } <SPAN CLASS="comment">// End namespace boost::iostreams:example</SPAN></PRE> |
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130 | |
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131 | <P>Let's look first at the helper function <CODE>get_char</CODE>:</P> |
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132 | |
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133 | <PRE class="broken_ie"> <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> get_char(<SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> c) |
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134 | { |
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135 | <SPAN CLASS="keyword">if</SPAN> (c == <SPAN CLASS="literal">'\n'</SPAN>) { |
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136 | col_no_ = 0; |
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137 | } <SPAN CLASS="keyword">else</SPAN> { |
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138 | ++col_no_; |
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139 | } |
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140 | <SPAN CLASS="keyword">return</SPAN> c; |
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141 | }</PRE> |
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142 | |
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143 | <P>This function updates the column count based on the given character <CODE>c</CODE> and returns <CODE>c</CODE>. Using <CODE>get_char</CODE> you can implement <CODE>get</CODE> as follows:</P> |
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144 | |
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145 | <PRE class="broken_ie"> <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Source> |
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146 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> get(Source& src) |
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147 | { |
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148 | <SPAN CLASS="keyword">if</SPAN> (spaces_ > 0) { |
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149 | --spaces_; |
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150 | <SPAN CLASS="keyword">return</SPAN> get_char(' '); |
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151 | } |
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152 | |
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153 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> c; |
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154 | <SPAN CLASS="keyword">if</SPAN> ((c = iostreams::get(src)) == <SPAN CLASS="numeric_literal">EOF</SPAN> || c == WOULD_BLOCK) |
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155 | <SPAN CLASS="keyword">return</SPAN> c; |
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156 | |
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157 | <SPAN CLASS="keyword">if</SPAN> (c != '\t') |
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158 | <SPAN CLASS="keyword">return</SPAN> get_char(c); |
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159 | |
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160 | <SPAN CLASS='comment'>// Found a tab. Call this filter recursively.</SPAN> |
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161 | spaces_ = tab_size_ - (col_no_ % tab_size_); |
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162 | <SPAN CLASS="keyword">return</SPAN> this->get(src); |
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163 | }</PRE> |
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164 | |
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165 | <P> |
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166 | The implementation is similar to that of <A HREF="line_wrapping_filters.html#line_wrapping_input_filter"><CODE>line_wrapping_input_filter::get</CODE></A>. Since <CODE>get</CODE> can only return a single character at a time, whenever a tab character must be replaced by a sequence of space character, only the first space character can be returned. The rest must be returned by subsequent invocations of <CODE>get</CODE>. The member variable <CODE>spaces_</CODE> is used to store the number of such space characters. |
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167 | </P> |
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168 | <P> |
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169 | The implementation begins by checking whether any space characters remain to be returned. If so, it decrements <CODE>spaces_</CODE> and returns a space. Otherwise, a character is read from <CODE>src</CODE>. Ordinary characters, as well as the special values <CODE>EOF</CODE> and <CODE>WOULD_BLOCK</CODE>, are returned <I>as-is</I>. When a tab character is encountered, the number of spaces which must be returned by future invocations of get is recorded, and a space character is returned. |
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170 | </P> |
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171 | |
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172 | <P>As usual, the function <CODE>close</CODE> resets the Filter's state:</P> |
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173 | |
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174 | <PRE class="broken_ie"> <SPAN CLASS="keyword">void</SPAN> close(Source&) |
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175 | { |
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176 | col_no_ = 0; |
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177 | spaces_ = 0; |
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178 | }</PRE> |
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179 | |
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180 | <A NAME="tab_expanding_output_filter"></A> |
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181 | <H4><CODE>tab_expanding_output_filter</CODE></H4> |
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182 | |
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183 | <P>You can express a tab-expanding Filter as an <A HREF="../concepts/output_filter.html">OutputFilter</A> as follows:</P> |
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184 | |
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185 | <PRE class="broken_ie"><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">// output_filter</SPAN> |
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186 | <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">// put</SPAN> |
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187 | |
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188 | <SPAN CLASS='keyword'>namespace</SPAN> boost { <SPAN CLASS='keyword'>namespace</SPAN> iostreams { <SPAN CLASS='keyword'>namespace</SPAN> example { |
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189 | |
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190 | <SPAN CLASS="keyword">class</SPAN> tab_expanding_output_filter : <SPAN CLASS="keyword"><SPAN CLASS="keyword"><SPAN CLASS="keyword">public</SPAN></SPAN></SPAN> output_filter { |
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191 | <SPAN CLASS="keyword">public</SPAN>: |
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192 | explicit tab_expanding_output_filter(<SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> tab_size = 8) |
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193 | : tab_size_(tab_size), col_no_(0), spaces_(0) |
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194 | { |
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195 | assert(tab_size > 0); |
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196 | } |
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197 | |
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198 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Sink> |
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199 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">bool</SPAN></SPAN> put(Sink& dest, <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> c); |
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200 | |
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201 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Sink> |
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202 | <SPAN CLASS="keyword">void</SPAN> close(Sink&); |
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203 | <SPAN CLASS="keyword">private</SPAN>: |
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204 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Sink> |
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205 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">bool</SPAN></SPAN> put_char(Sink& dest, <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> c); |
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206 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> tab_size_; |
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207 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> col_no_; |
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208 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> spaces_; |
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209 | }; |
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210 | |
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211 | } } } <SPAN CLASS="comment">// End namespace boost::iostreams:example</SPAN></PRE> |
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212 | |
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213 | <P>The implemenation helper function <CODE>put_char</CODE> is the same as that of <A HREF="line_wrapping_filters.html#line_wrapping_output_filter"><CODE>line_wrapping_output_filter::put_char</CODE></A>: it writes the given character to <CODE>std::cout</CODE> and increments the column number, unless the character is a newline, in which case the column number is reset.</P> |
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214 | |
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215 | <PRE class="broken_ie"> <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Sink> |
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216 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">bool</SPAN></SPAN> put_char(Sink& dest, <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> c) |
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217 | { |
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218 | <SPAN CLASS="keyword">if</SPAN> (!iostreams::put(dest, c)) |
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219 | <SPAN CLASS="keyword">return</SPAN> <SPAN CLASS="keyword">false</SPAN>; |
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220 | <SPAN CLASS="keyword">if</SPAN> (c != <SPAN CLASS="literal">'\n'</SPAN>) |
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221 | ++col_no_; |
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222 | <SPAN CLASS="keyword">else</SPAN> |
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223 | col_no_ = 0; |
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224 | <SPAN CLASS="keyword">return</SPAN> <SPAN CLASS="keyword">true</SPAN>; |
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225 | }</PRE> |
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226 | |
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227 | <P>Using <CODE>put_char</CODE> you can implement <CODE>put</CODE> as follows:</P> |
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228 | |
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229 | <PRE class="broken_ie"> <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Sink> |
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230 | <SPAN CLASS="keyword"><SPAN CLASS="keyword">bool</SPAN></SPAN> put(Sink& dest, <SPAN CLASS="keyword"><SPAN CLASS="keyword">int</SPAN></SPAN> c) |
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231 | { |
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232 | for (; spaces_ > 0; --spaces_) |
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233 | <SPAN CLASS="keyword">if</SPAN> (!put_char(dest, ' ')) |
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234 | <SPAN CLASS="keyword">return</SPAN> <SPAN CLASS="keyword">false</SPAN>; |
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235 | |
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236 | <SPAN CLASS="keyword">if</SPAN> (c == '\t') { |
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237 | spaces_ = tab_size_ - (col_no_ % tab_size_) - 1; |
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238 | <SPAN CLASS="keyword">return</SPAN> this->put(dest, ' '); |
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239 | } |
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240 | |
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241 | <SPAN CLASS="keyword">return</SPAN> put_char(dest, c); |
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242 | }</PRE> |
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243 | |
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244 | <P> |
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245 | The implementation begins by attempting to write any space characters left over from previously encountered tabs. If successful, it examine the given character <CODE>c</CODE>. If <CODE>c</CODE> is not a tab character, it attempts to write it to <CODE>dest</CODE>. Otherwise, it calculates the number of spaces which must be inserted and calls itself recursively. Using recursion here saves us from having to decrement the member variable <CODE>spaces_</CODE> at two different points in the code. |
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246 | </P> |
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247 | <P> |
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248 | Note that after a tab character is encountered, get will return false until all the associated space characters have been written. |
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249 | </P> |
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250 | |
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251 | <P>As usual, the function <CODE>close</CODE> resets the Filter's state:</P> |
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252 | |
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253 | <PRE class="broken_ie"> <SPAN CLASS="keyword">void</SPAN> close(Source&) |
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254 | { |
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255 | col_no_ = 0; |
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256 | spaces_ = 0; |
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257 | }</PRE> |
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270 | |
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271 | <HR> |
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272 | |
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273 | <P CLASS="copyright">Revised |
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274 | <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan --> |
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275 | 20 May, 2004 |
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276 | <!--webbot bot="Timestamp" endspan i-checksum="38504" --> |
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277 | </P> |
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278 | |
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279 | <P CLASS="copyright">© Copyright <A HREF="http://www.kangaroologic.com" TARGET="_top">Jonathan Turkanis</A>, 2004</P> |
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280 | <P CLASS="copyright"> |
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281 | 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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