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| <div class="section" lang="en"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="boost_regex.ref.deprecated_interfaces.regex_grep"></a><a class="link" href="regex_grep.html" title="regex_grep (Deprecated)"> |
| regex_grep (Deprecated)</a> |
| </h4></div></div></div> |
| <p> |
| The algorithm <code class="computeroutput"><span class="identifier">regex_grep</span></code> |
| is deprecated in favor of <a class="link" href="../regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> which provides |
| a more convenient and standard library friendly interface. |
| </p> |
| <p> |
| The following documentation is taken unchanged from the previous boost |
| release, and will not be updated in future. |
| </p> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| <p> |
| <code class="computeroutput"><span class="identifier">regex_grep</span></code> allows you to |
| search through a bidirectional-iterator range and locate all the (non-overlapping) |
| matches with a given regular expression. The function is declared as: |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Predicate</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">iterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span> |
| <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">regex_grep</span><span class="special">(</span><span class="identifier">Predicate</span> <span class="identifier">foo</span><span class="special">,</span> |
| <span class="identifier">iterator</span> <span class="identifier">first</span><span class="special">,</span> |
| <span class="identifier">iterator</span> <span class="identifier">last</span><span class="special">,</span> |
| <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">,</span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">match_default</span><span class="special">)</span> |
| </pre> |
| <p> |
| The library also defines the following convenience versions, which take |
| either a <code class="computeroutput"><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span></code>, or a <code class="computeroutput"><span class="keyword">const</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><>&</span></code> |
| in place of a pair of iterators. |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Predicate</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span> |
| <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">regex_grep</span><span class="special">(</span><span class="identifier">Predicate</span> <span class="identifier">foo</span><span class="special">,</span> |
| <span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">str</span><span class="special">,</span> |
| <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">,</span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">match_default</span><span class="special">);</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Predicate</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ST</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">SA</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span> |
| <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">regex_grep</span><span class="special">(</span><span class="identifier">Predicate</span> <span class="identifier">foo</span><span class="special">,</span> |
| <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">ST</span><span class="special">,</span> <span class="identifier">SA</span><span class="special">>&</span> <span class="identifier">s</span><span class="special">,</span> |
| <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">,</span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">match_default</span><span class="special">);</span> |
| </pre> |
| <p> |
| The parameters for the primary version of <code class="computeroutput"><span class="identifier">regex_grep</span></code> |
| have the following meanings: |
| </p> |
| <p> |
| foo: A predicate function object or function pointer, see below for more |
| information. |
| </p> |
| <p> |
| first: The start of the range to search. |
| </p> |
| <p> |
| last: The end of the range to search. |
| </p> |
| <p> |
| e: The regular expression to search for. |
| </p> |
| <p> |
| flags: The flags that determine how matching is carried out, one of the |
| match_flags enumerators. |
| </p> |
| <p> |
| The algorithm finds all of the non-overlapping matches of the expression |
| <span class="emphasis"><em>e</em></span>, for each match it fills a <code class="computeroutput"><span class="identifier">match_results</span><span class="special"><</span><span class="identifier">iterator</span><span class="special">></span></code> structure, which contains information |
| on what matched, and calls the predicate <span class="emphasis"><em>foo</em></span>, passing |
| the <code class="computeroutput"><span class="identifier">match_results</span><span class="special"><</span><span class="identifier">iterator</span><span class="special">></span></code> |
| as a single argument. If the predicate returns <span class="emphasis"><em>true</em></span>, |
| then the grep operation continues, otherwise it terminates without searching |
| for further matches. The function returns the number of matches found. |
| </p> |
| <p> |
| The general form of the predicate is: |
| </p> |
| <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">grep_predicate</span> |
| <span class="special">{</span> |
| <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">match_results</span><span class="special"><</span><span class="identifier">iterator_type</span><span class="special">>&</span> <span class="identifier">m</span><span class="special">);</span> |
| <span class="special">};</span> |
| </pre> |
| <p> |
| For example the regular expression "a*b" would find one match |
| in the string "aaaaab" and two in the string "aaabb". |
| </p> |
| <p> |
| Remember this algorithm can be used for a lot more than implementing a |
| version of grep, the predicate can be and do anything that you want, grep |
| utilities would output the results to the screen, another program could |
| index a file based on a regular expression and store a set of bookmarks |
| in a list, or a text file conversion utility would output to file. The |
| results of one <code class="computeroutput"><span class="identifier">regex_grep</span></code> |
| can even be chained into another <code class="computeroutput"><span class="identifier">regex_grep</span></code> |
| to create recursive parsers. |
| </p> |
| <p> |
| The algorithm may throw <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span></code> |
| if the complexity of matching the expression against an <span class="emphasis"><em>N</em></span> |
| character string begins to exceed O(N<sup>2</sup>), or if the program runs out of |
| stack space while matching the expression (if Boost.Regex is configured |
| in recursive mode), or if the matcher exhausts it's permitted memory allocation |
| (if Boost.Regex is configured in non-recursive mode). |
| </p> |
| <p> |
| Example: convert the example from <a class="link" href="../regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a> to use <code class="computeroutput"><span class="identifier">regex_grep</span></code> instead: |
| </p> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">string</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">map</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| |
| <span class="comment">// IndexClasses: |
| </span><span class="comment">// takes the contents of a file in the form of a string |
| </span><span class="comment">// and searches for all the C++ class definitions, storing |
| </span><span class="comment">// their locations in a map of strings/int's |
| </span><span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span> <span class="special">></span> <span class="identifier">map_type</span><span class="special">;</span> |
| |
| <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">re</span> <span class="special">=</span> |
| <span class="comment">// possibly leading whitespace: |
| </span> <span class="string">"^[[:space:]]*"</span> |
| <span class="comment">// possible template declaration: |
| </span> <span class="string">"(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"</span> |
| <span class="comment">// class or struct: |
| </span> <span class="string">"(class|struct)[[:space:]]*"</span> |
| <span class="comment">// leading declspec macros etc: |
| </span> <span class="string">"("</span> |
| <span class="string">"\\<\\w+\\>"</span> |
| <span class="string">"("</span> |
| <span class="string">"[[:blank:]]*\\([^)]*\\)"</span> |
| <span class="string">")?"</span> |
| <span class="string">"[[:space:]]*"</span> |
| <span class="string">")*"</span> |
| <span class="comment">// the class name |
| </span> <span class="string">"(\\<\\w*\\>)[[:space:]]*"</span> |
| <span class="comment">// template specialisation parameters |
| </span> <span class="string">"(<[^;:{]+>)?[[:space:]]*"</span> |
| <span class="comment">// terminate in { or : |
| </span> <span class="string">"(\\{|:[^;\\{()]*\\{)"</span><span class="special">;</span> |
| |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span> <span class="identifier">expression</span><span class="special">(</span><span class="identifier">re</span><span class="special">);</span> |
| <span class="keyword">class</span> <span class="identifier">IndexClassesPred</span> |
| <span class="special">{</span> |
| <span class="identifier">map_type</span><span class="special">&</span> <span class="identifier">m</span><span class="special">;</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span> <span class="identifier">base</span><span class="special">;</span> |
| <span class="keyword">public</span><span class="special">:</span> |
| <span class="identifier">IndexClassesPred</span><span class="special">(</span><span class="identifier">map_type</span><span class="special">&</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span> <span class="identifier">b</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">m</span><span class="special">(</span><span class="identifier">a</span><span class="special">),</span> <span class="identifier">base</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span> <span class="special">{}</span> |
| <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">smatch</span><span class="special">&</span> <span class="identifier">what</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="comment">// what[0] contains the whole string |
| </span> <span class="comment">// what[5] contains the class name. |
| </span> <span class="comment">// what[6] contains the template specialisation if any. |
| </span> <span class="comment">// add class name and position to map: |
| </span> <span class="identifier">m</span><span class="special">[</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">second</span><span class="special">)</span> <span class="special">+</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="identifier">what</span><span class="special">[</span><span class="number">6</span><span class="special">].</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">what</span><span class="special">[</span><span class="number">6</span><span class="special">].</span><span class="identifier">second</span><span class="special">)]</span> <span class="special">=</span> |
| <span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">first</span> <span class="special">-</span> <span class="identifier">base</span><span class="special">;</span> |
| <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> |
| <span class="special">}</span> |
| <span class="special">};</span> |
| <span class="keyword">void</span> <span class="identifier">IndexClasses</span><span class="special">(</span><span class="identifier">map_type</span><span class="special">&</span> <span class="identifier">m</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">file</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span> <span class="identifier">start</span><span class="special">,</span> <span class="identifier">end</span><span class="special">;</span> |
| <span class="identifier">start</span> <span class="special">=</span> <span class="identifier">file</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> |
| <span class="identifier">end</span> <span class="special">=</span> <span class="identifier">file</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> |
| <span class="identifier">regex_grep</span><span class="special">(</span><span class="identifier">IndexClassesPred</span><span class="special">(</span><span class="identifier">m</span><span class="special">,</span> <span class="identifier">start</span><span class="special">),</span> <span class="identifier">start</span><span class="special">,</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">expression</span><span class="special">);</span> |
| <span class="special">}</span> |
| </pre> |
| <p> |
| Example: Use <code class="computeroutput"><span class="identifier">regex_grep</span></code> |
| to call a global callback function: |
| </p> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">string</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">map</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| |
| <span class="comment">// purpose: |
| </span><span class="comment">// takes the contents of a file in the form of a string |
| </span><span class="comment">// and searches for all the C++ class definitions, storing |
| </span><span class="comment">// their locations in a map of strings/int's |
| </span><span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span> <span class="special">></span> <span class="identifier">map_type</span><span class="special">;</span> |
| |
| <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">re</span> <span class="special">=</span> |
| <span class="comment">// possibly leading whitespace: |
| </span> <span class="string">"^[[:space:]]*"</span> |
| <span class="comment">// possible template declaration: |
| </span> <span class="string">"(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"</span> |
| <span class="comment">// class or struct: |
| </span> <span class="string">"(class|struct)[[:space:]]*"</span> |
| <span class="comment">// leading declspec macros etc: |
| </span> <span class="string">"("</span> |
| <span class="string">"\\<\\w+\\>"</span> |
| <span class="string">"("</span> |
| <span class="string">"[[:blank:]]*\\([^)]*\\)"</span> |
| <span class="string">")?"</span> |
| <span class="string">"[[:space:]]*"</span> |
| <span class="string">")*"</span> |
| <span class="comment">// the class name |
| </span> <span class="string">"(\\<\\w*\\>)[[:space:]]*"</span> |
| <span class="comment">// template specialisation parameters |
| </span> <span class="string">"(<[^;:{]+>)?[[:space:]]*"</span> |
| <span class="comment">// terminate in { or : |
| </span> <span class="string">"(\\{|:[^;\\{()]*\\{)"</span><span class="special">;</span> |
| |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span> <span class="identifier">expression</span><span class="special">(</span><span class="identifier">re</span><span class="special">);</span> |
| <span class="identifier">map_type</span> <span class="identifier">class_index</span><span class="special">;</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span> <span class="identifier">base</span><span class="special">;</span> |
| |
| <span class="keyword">bool</span> <span class="identifier">grep_callback</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">smatch</span><span class="special">&</span> <span class="identifier">what</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="comment">// what[0] contains the whole string |
| </span> <span class="comment">// what[5] contains the class name. |
| </span> <span class="comment">// what[6] contains the template specialisation if any. |
| </span> <span class="comment">// add class name and position to map: |
| </span> <span class="identifier">class_index</span><span class="special">[</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">second</span><span class="special">)</span> <span class="special">+</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="identifier">what</span><span class="special">[</span><span class="number">6</span><span class="special">].</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">what</span><span class="special">[</span><span class="number">6</span><span class="special">].</span><span class="identifier">second</span><span class="special">)]</span> <span class="special">=</span> |
| <span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">first</span> <span class="special">-</span> <span class="identifier">base</span><span class="special">;</span> |
| <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> |
| <span class="special">}</span> |
| <span class="keyword">void</span> <span class="identifier">IndexClasses</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">file</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span> <span class="identifier">start</span><span class="special">,</span> <span class="identifier">end</span><span class="special">;</span> |
| <span class="identifier">start</span> <span class="special">=</span> <span class="identifier">file</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> |
| <span class="identifier">end</span> <span class="special">=</span> <span class="identifier">file</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> |
| <span class="identifier">base</span> <span class="special">=</span> <span class="identifier">start</span><span class="special">;</span> |
| <span class="identifier">regex_grep</span><span class="special">(</span><span class="identifier">grep_callback</span><span class="special">,</span> <span class="identifier">start</span><span class="special">,</span> <span class="identifier">end</span><span class="special">,</span> <span class="identifier">expression</span><span class="special">,</span> <span class="identifier">match_default</span><span class="special">);</span> |
| <span class="special">}</span> |
| </pre> |
| <p> |
| Example: use <code class="computeroutput"><span class="identifier">regex_grep</span></code> |
| to call a class member function, use the standard library adapters <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">mem_fun</span></code> and <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">bind1st</span></code> |
| to convert the member function into a predicate: |
| </p> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">string</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">map</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">functional</span><span class="special">></span> |
| <span class="comment">// purpose: |
| </span><span class="comment">// takes the contents of a file in the form of a string |
| </span><span class="comment">// and searches for all the C++ class definitions, storing |
| </span><span class="comment">// their locations in a map of strings/int's |
| </span> |
| <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span> <span class="special">></span> <span class="identifier">map_type</span><span class="special">;</span> |
| <span class="keyword">class</span> <span class="identifier">class_index</span> |
| <span class="special">{</span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span> <span class="identifier">expression</span><span class="special">;</span> |
| <span class="identifier">map_type</span> <span class="identifier">index</span><span class="special">;</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span> <span class="identifier">base</span><span class="special">;</span> |
| <span class="keyword">bool</span> <span class="identifier">grep_callback</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">smatch</span> <span class="identifier">what</span><span class="special">);</span> |
| <span class="keyword">public</span><span class="special">:</span> |
| <span class="keyword">void</span> <span class="identifier">IndexClasses</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">file</span><span class="special">);</span> |
| <span class="identifier">class_index</span><span class="special">()</span> |
| <span class="special">:</span> <span class="identifier">index</span><span class="special">(),</span> |
| <span class="identifier">expression</span><span class="special">(</span><span class="string">"^(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"</span> |
| <span class="string">"(class|struct)[[:space:]]*(\\<\\w+\\>([[:blank:]]*\\([^)]*\\))?"</span> |
| <span class="string">"[[:space:]]*)*(\\<\\w*\\>)[[:space:]]*(<[^;:{]+>[[:space:]]*)?"</span> |
| <span class="string">"(\\{|:[^;\\{()]*\\{)"</span> |
| <span class="special">){}</span> |
| <span class="special">};</span> |
| <span class="keyword">bool</span> <span class="identifier">class_index</span><span class="special">::</span><span class="identifier">grep_callback</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">smatch</span> <span class="identifier">what</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="comment">// what[0] contains the whole string |
| </span> <span class="comment">// what[5] contains the class name. |
| </span> <span class="comment">// what[6] contains the template specialisation if any. |
| </span> <span class="comment">// add class name and position to map: |
| </span> <span class="identifier">index</span><span class="special">[</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">second</span><span class="special">)</span> <span class="special">+</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="identifier">what</span><span class="special">[</span><span class="number">6</span><span class="special">].</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">what</span><span class="special">[</span><span class="number">6</span><span class="special">].</span><span class="identifier">second</span><span class="special">)]</span> <span class="special">=</span> |
| <span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">first</span> <span class="special">-</span> <span class="identifier">base</span><span class="special">;</span> |
| <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> |
| <span class="special">}</span> |
| |
| <span class="keyword">void</span> <span class="identifier">class_index</span><span class="special">::</span><span class="identifier">IndexClasses</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">file</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span> <span class="identifier">start</span><span class="special">,</span> <span class="identifier">end</span><span class="special">;</span> |
| <span class="identifier">start</span> <span class="special">=</span> <span class="identifier">file</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> |
| <span class="identifier">end</span> <span class="special">=</span> <span class="identifier">file</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> |
| <span class="identifier">base</span> <span class="special">=</span> <span class="identifier">start</span><span class="special">;</span> |
| <span class="identifier">regex_grep</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">bind1st</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">mem_fun</span><span class="special">(&</span><span class="identifier">class_index</span><span class="special">::</span><span class="identifier">grep_callback</span><span class="special">),</span> <span class="keyword">this</span><span class="special">),</span> |
| <span class="identifier">start</span><span class="special">,</span> |
| <span class="identifier">end</span><span class="special">,</span> |
| <span class="identifier">expression</span><span class="special">);</span> |
| <span class="special">}</span> |
| </pre> |
| <p> |
| Finally, C++ Builder users can use C++ Builder's closure type as a callback |
| argument: |
| </p> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">string</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">map</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">functional</span><span class="special">></span> |
| <span class="comment">// purpose: |
| </span><span class="comment">// takes the contents of a file in the form of a string |
| </span><span class="comment">// and searches for all the C++ class definitions, storing |
| </span><span class="comment">// their locations in a map of strings/int's |
| </span> |
| <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span> <span class="special">></span> <span class="identifier">map_type</span><span class="special">;</span> |
| <span class="keyword">class</span> <span class="identifier">class_index</span> |
| <span class="special">{</span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span> <span class="identifier">expression</span><span class="special">;</span> |
| <span class="identifier">map_type</span> <span class="identifier">index</span><span class="special">;</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span> <span class="identifier">base</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">smatch</span> <span class="identifier">arg_type</span><span class="special">;</span> |
| <span class="keyword">bool</span> <span class="identifier">grep_callback</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">arg_type</span><span class="special">&</span> <span class="identifier">what</span><span class="special">);</span> |
| <span class="keyword">public</span><span class="special">:</span> |
| <span class="keyword">typedef</span> <span class="keyword">bool</span> <span class="special">(</span><span class="identifier">__closure</span><span class="special">*</span> <span class="identifier">grep_callback_type</span><span class="special">)(</span><span class="keyword">const</span> <span class="identifier">arg_type</span><span class="special">&);</span> |
| <span class="keyword">void</span> <span class="identifier">IndexClasses</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">file</span><span class="special">);</span> |
| <span class="identifier">class_index</span><span class="special">()</span> |
| <span class="special">:</span> <span class="identifier">index</span><span class="special">(),</span> |
| <span class="identifier">expression</span><span class="special">(</span><span class="string">"^(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"</span> |
| <span class="string">"(class|struct)[[:space:]]*(\\<\\w+\\>([[:blank:]]*\\([^)]*\\))?"</span> |
| <span class="string">"[[:space:]]*)*(\\<\\w*\\>)[[:space:]]*(<[^;:{]+>[[:space:]]*)?"</span> |
| <span class="string">"(\\{|:[^;\\{()]*\\{)"</span> |
| <span class="special">){}</span> |
| <span class="special">};</span> |
| |
| <span class="keyword">bool</span> <span class="identifier">class_index</span><span class="special">::</span><span class="identifier">grep_callback</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">arg_type</span><span class="special">&</span> <span class="identifier">what</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="comment">// what[0] contains the whole string |
| </span><span class="comment">// what[5] contains the class name. |
| </span><span class="comment">// what[6] contains the template specialisation if any. |
| </span><span class="comment">// add class name and position to map: |
| </span><span class="identifier">index</span><span class="special">[</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">second</span><span class="special">)</span> <span class="special">+</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="identifier">what</span><span class="special">[</span><span class="number">6</span><span class="special">].</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">what</span><span class="special">[</span><span class="number">6</span><span class="special">].</span><span class="identifier">second</span><span class="special">)]</span> <span class="special">=</span> |
| <span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">first</span> <span class="special">-</span> <span class="identifier">base</span><span class="special">;</span> |
| <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> |
| <span class="special">}</span> |
| |
| <span class="keyword">void</span> <span class="identifier">class_index</span><span class="special">::</span><span class="identifier">IndexClasses</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">file</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span> <span class="identifier">start</span><span class="special">,</span> <span class="identifier">end</span><span class="special">;</span> |
| <span class="identifier">start</span> <span class="special">=</span> <span class="identifier">file</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> |
| <span class="identifier">end</span> <span class="special">=</span> <span class="identifier">file</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> |
| <span class="identifier">base</span> <span class="special">=</span> <span class="identifier">start</span><span class="special">;</span> |
| <span class="identifier">class_index</span><span class="special">::</span><span class="identifier">grep_callback_type</span> <span class="identifier">cl</span> <span class="special">=</span> <span class="special">&(</span><span class="keyword">this</span><span class="special">-></span><span class="identifier">grep_callback</span><span class="special">);</span> |
| <span class="identifier">regex_grep</span><span class="special">(</span><span class="identifier">cl</span><span class="special">,</span> |
| <span class="identifier">start</span><span class="special">,</span> |
| <span class="identifier">end</span><span class="special">,</span> |
| <span class="identifier">expression</span><span class="special">);</span> |
| <span class="special">}</span> |
| </pre> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 1998 -2010 John Maddock<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
| </p> |
| </div></td> |
| </tr></table> |
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