2003-05-17 11:45:48 +00:00
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<title>Boost.Regex: Algorithm regex_grep (deprecated)</title>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<link rel="stylesheet" type="text/css" href="../../../boost.css">
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</head>
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<body>
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<p></p>
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<table id="Table1" cellspacing="1" cellpadding="1" width="100%" border="0">
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<tr>
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<td valign="top" width="300">
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<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
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</td>
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<td width="353">
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<h1 align="center">Boost.Regex</h1>
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<h2 align="center">Algorithm regex_grep (deprecated)</h2>
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</td>
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<td width="50">
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<h3><a href="index.html"><img height="45" width="43" alt="Boost.Regex Index" src="uarrow.gif" border="0"></a></h3>
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</td>
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</tr>
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</table>
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<br>
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<br>
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<hr>
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<p>The algorithm regex_grep is deprecated in favor of <a href="regex_iterator.html">regex_iterator</a>
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which provides a more convenient and standard library friendly interface.</p>
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<p>The following documentation is taken unchanged from the previous boost release,
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and will not be updated in future.</p>
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<hr>
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<pre>
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2003-05-24 11:13:26 +00:00
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#include <<a href="../../../boost/regex.hpp">boost/regex.hpp</a>>
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2003-05-17 11:45:48 +00:00
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</pre>
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<p>regex_grep allows you to search through a bidirectional-iterator range and
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locate all the (non-overlapping) matches with a given regular expression. The
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function is declared as:</p>
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<pre>
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<b>template</b> <<b>class</b> Predicate, <b>class</b> iterator, <b>class</b> charT, <b>class</b> traits, <b>class</b> Allocator>
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<b>unsigned</b> <b>int</b> regex_grep(Predicate foo,
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iterator first,
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iterator last,
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<b>const</b> basic_regex<charT, traits, Allocator>& e,
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<b>unsigned</b> flags = match_default)
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</pre>
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<p>The library also defines the following convenience versions, which take either
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a const charT*, or a const std::basic_string<>& in place of a pair of
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iterators [note - these versions may not be available, or may be available in a
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more limited form, depending upon your compilers capabilities]:</p>
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<pre>
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<b>template</b> <<b>class</b> Predicate, <b>class</b> charT, <b>class</b> Allocator, <b>class</b> traits>
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<b>unsigned</b> <b>int</b> regex_grep(Predicate foo,
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<b>const</b> charT* str,
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<b>const</b> basic_regex<charT, traits, Allocator>& e,
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<b>unsigned</b> flags = match_default);
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<b>template</b> <<b>class</b> Predicate, <b>class</b> ST, <b>class</b> SA, <b>class</b> Allocator, <b>class</b> charT, <b>class</b> traits>
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<b>unsigned</b> <b>int</b> regex_grep(Predicate foo,
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<b>const</b> std::basic_string<charT, ST, SA>& s,
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<b>const</b> basic_regex<charT, traits, Allocator>& e,
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<b>unsigned</b> flags = match_default);
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</pre>
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<p>The parameters for the primary version of regex_grep have the following
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meanings: </p>
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<p></p>
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<table id="Table2" cellspacing="0" cellpadding="7" width="624" border="0">
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<tr>
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<td width="5%"> </td>
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<td valign="top" width="50%">foo</td>
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<td valign="top" width="50%">A predicate function object or function pointer, see
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below for more information.</td>
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<td width="5%"> </td>
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</tr>
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<tr>
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<td> </td>
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<td valign="top" width="50%">first</td>
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<td valign="top" width="50%">The start of the range to search.</td>
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<td> </td>
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</tr>
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<tr>
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<td> </td>
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<td valign="top" width="50%">last</td>
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<td valign="top" width="50%">The end of the range to search.</td>
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<td> </td>
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</tr>
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<tr>
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<td> </td>
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<td valign="top" width="50%">e</td>
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<td valign="top" width="50%">The regular expression to search for.</td>
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<td> </td>
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</tr>
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<tr>
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<td> </td>
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<td valign="top" width="50%">flags</td>
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<td valign="top" width="50%">The flags that determine how matching is carried out,
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one of the <a href="#match_type">match_flags</a> enumerators.</td>
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<td> </td>
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</tr>
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</table>
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<br>
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<br>
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<p>The algorithm finds all of the non-overlapping matches of the expression e, for
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each match it fills a <a href="#reg_match">match_results</a><iterator,
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Allocator> structure, which contains information on what matched, and calls
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the predicate foo, passing the match_results<iterator, Allocator> as a
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single argument. If the predicate returns true, then the grep operation
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continues, otherwise it terminates without searching for further matches. The
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function returns the number of matches found.</p>
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<p>The general form of the predicate is:</p>
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<pre>
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<b>struct</b> grep_predicate
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{
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<b> bool</b> <b>operator</b>()(<b>const</b> match_results<iterator_type, typename expression_type::alloc_type::template rebind<sub_match<BidirectionalIterator> >::other>& m);
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};
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</pre>
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<p>Note that in almost every case the allocator parameter can be omitted, when
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specifying the <a href="match_results.html">match_results</a> type,
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alternatively one of the typedefs cmatch, wcmatch, smatch or wsmatch can be
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used.</p>
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<p>For example the regular expression "a*b" would find one match in the string
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"aaaaab" and two in the string "aaabb".</p>
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<p>Remember this algorithm can be used for a lot more than implementing a version
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of grep, the predicate can be and do anything that you want, grep utilities
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would output the results to the screen, another program could index a file
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based on a regular expression and store a set of bookmarks in a list, or a text
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file conversion utility would output to file. The results of one regex_grep can
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even be chained into another regex_grep to create recursive parsers.</p>
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<P>The algorithm may throw <CODE>std::runtime_error</CODE> if the complexity
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of matching the expression against an N character string begins to exceed O(N<SUP>2</SUP>),
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or if the program runs out of stack space while matching the expression (if
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Boost.regex is <A href="configuration.html">configured</A> in recursive mode),
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or if the matcher exhausts it's permitted memory allocation (if Boost.regex is <A href="configuration.html">
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configured</A> in non-recursive mode).</P>
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<p><a href="../example/snippets/regex_grep_example_1.cpp"> Example</a>: convert
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the example from <i>regex_search</i> to use <i>regex_grep</i> instead:</p>
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<pre>
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<font color="#008000">#include <string>
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#include <map>
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#include <boost/regex.hpp>
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</font><font color="#000080"><i>// IndexClasses:
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// takes the contents of a file in the form of a string
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// and searches for all the C++ class definitions, storing
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// their locations in a map of strings/int's
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</i></font><b>typedef</b> std::map<std::string, <b>int</b>, std::less<std::string> > map_type;
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const char* re =
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// possibly leading whitespace:
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"^[[:space:]]*"
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// possible template declaration:
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"(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"
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// class or struct:
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"(class|struct)[[:space:]]*"
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// leading declspec macros etc:
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"("
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"\\<\\w+\\>"
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"("
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"[[:blank:]]*\\([^)]*\\)"
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")?"
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"[[:space:]]*"
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")*"
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// the class name
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"(\\<\\w*\\>)[[:space:]]*"
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// template specialisation parameters
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"(<[^;:{]+>)?[[:space:]]*"
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// terminate in { or :
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"(\\{|:[^;\\{()]*\\{)";
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boost::regex expression(re);
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<b>class</b> IndexClassesPred
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{
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map_type& m;
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std::string::const_iterator base;
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<b>public</b>:
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IndexClassesPred(map_type& a, std::string::const_iterator b) : m(a), base(b) {}
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<b>bool</b> <b>operator</b>()(<b>const</b> smatch& what)
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{
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<font color=
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#000080> <i>// what[0] contains the whole string
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</i> <i>// what[5] contains the class name.
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</i> <i>// what[6] contains the template specialisation if any.
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</i> <i>// add class name and position to map:
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</i></font> m[std::string(what[5].first, what[5].second) + std::string(what[6].first, what[6].second)] =
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what[5].first - base;
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<b>return</b> <b>true</b>;
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}
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};
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<b>void</b> IndexClasses(map_type& m, <b>const</b> std::string& file)
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{
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std::string::const_iterator start, end;
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start = file.begin();
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end = file.end();
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regex_grep(IndexClassesPred(m, start), start, end, expression);
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}
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</pre>
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<p><a href="../example/snippets/regex_grep_example_2.cpp"> Example</a>: Use
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regex_grep to call a global callback function:</p>
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<pre>
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<font color="#008000">#include <string>
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#include <map>
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#include <boost/regex.hpp>
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</font><font color="#000080"><i>// purpose:
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// takes the contents of a file in the form of a string
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// and searches for all the C++ class definitions, storing
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// their locations in a map of strings/int's
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</i></font><b>typedef</b> std::map<std::string, <b>int</b>, std::less<std::string> > map_type;
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const char* re =
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// possibly leading whitespace:
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"^[[:space:]]*"
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// possible template declaration:
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"(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"
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// class or struct:
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"(class|struct)[[:space:]]*"
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// leading declspec macros etc:
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"("
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"\\<\\w+\\>"
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"("
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"[[:blank:]]*\\([^)]*\\)"
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")?"
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"[[:space:]]*"
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")*"
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// the class name
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"(\\<\\w*\\>)[[:space:]]*"
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// template specialisation parameters
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"(<[^;:{]+>)?[[:space:]]*"
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// terminate in { or :
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"(\\{|:[^;\\{()]*\\{)";
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boost::regex expression(re);
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map_type class_index;
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std::string::const_iterator base;
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<b>bool</b> grep_callback(<b>const</b> boost::smatch& what)
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{
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<font color="#000080"> <i>// what[0] contains the whole string
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</i> <i>// what[5] contains the class name.
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</i> <i>// what[6] contains the template specialisation if any.
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</i> <i>// add class name and position to map:
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</i></font> class_index[std::string(what[5].first, what[5].second) + std::string(what[6].first, what[6].second)] =
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what[5].first - base;
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<b>return</b> <b>true</b>;
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}
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<b>void</b> IndexClasses(<b>const</b> std::string& file)
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{
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std::string::const_iterator start, end;
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start = file.begin();
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end = file.end();
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base = start;
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regex_grep(grep_callback, start, end, expression, match_default);
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}
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</pre>
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<p><a href="../example/snippets/regex_grep_example_3.cpp"> Example</a>: use
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regex_grep to call a class member function, use the standard library adapters <i>std::mem_fun</i>
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and <i>std::bind1st</i> to convert the member function into a predicate:</p>
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<pre>
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<font color="#008000">#include <string>
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#include <map>
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#include <boost/regex.hpp>
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#include <functional>
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</font><font color="#000080"><i>// purpose:
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// takes the contents of a file in the form of a string
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// and searches for all the C++ class definitions, storing
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// their locations in a map of strings/int's
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</i></font><b>typedef</b> std::map<std::string, <b>int</b>, std::less<std::string> > map_type;
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<b>class</b> class_index
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{
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boost::regex expression;
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map_type index;
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std::string::const_iterator base;
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<b>bool</b> grep_callback(boost::smatch what);
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<b>public</b>:
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<b> void</b> IndexClasses(<b>const</b> std::string& file);
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class_index()
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: index(),
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expression(<font color=
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#000080>"^(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"
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"(class|struct)[[:space:]]*(\\<\\w+\\>([[:blank:]]*\\([^)]*\\))?"
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"[[:space:]]*)*(\\<\\w*\\>)[[:space:]]*(<[^;:{]+>[[:space:]]*)?"
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"(\\{|:[^;\\{()]*\\{)"
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</font> ){}
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};
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<b>bool</b> class_index::grep_callback(boost::smatch what)
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{
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<font color="#000080"> <i>// what[0] contains the whole string
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</i> <i>// what[5] contains the class name.
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</i> <i>// what[6] contains the template specialisation if any.
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</i> <i>// add class name and position to map:
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</i></font> index[std::string(what[5].first, what[5].second) + std::string(what[6].first, what[6].second)] =
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what[5].first - base;
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<b>return</b> <b>true</b>;
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}
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<b>void</b> class_index::IndexClasses(<b>const</b> std::string& file)
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{
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std::string::const_iterator start, end;
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start = file.begin();
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end = file.end();
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base = start;
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regex_grep(std::bind1st(std::mem_fun(&class_index::grep_callback), <b>this</b>),
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start,
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end,
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expression);
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}
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</pre>
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<p><a href="../example/snippets/regex_grep_example_4.cpp"> Finally</a>, C++
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Builder users can use C++ Builder's closure type as a callback argument:</p>
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<pre>
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<font color="#008000">#include <string>
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#include <map>
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#include <boost/regex.hpp>
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#include <functional>
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</font><font color="#000080"><i>// purpose:
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// takes the contents of a file in the form of a string
|
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// and searches for all the C++ class definitions, storing
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// their locations in a map of strings/int's
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</i></font><b>typedef</b> std::map<std::string, <b>int</b>, std::less<std::string> > map_type;
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<b>class</b> class_index
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{
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boost::regex expression;
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map_type index;
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std::string::const_iterator base;
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<b>typedef</b> boost::smatch arg_type;
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<b>bool</b> grep_callback(<b>const</b> arg_type& what);
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<b>public</b>:
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<b>typedef</b> <b>bool</b> (<b>__closure</b>* grep_callback_type)(<b>const</b> arg_type&);
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<b>void</b> IndexClasses(<b>const</b> std::string& file);
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class_index()
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: index(),
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expression(<font color=
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#000080>"^(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"
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"(class|struct)[[:space:]]*(\\<\\w+\\>([[:blank:]]*\\([^)]*\\))?"
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"[[:space:]]*)*(\\<\\w*\\>)[[:space:]]*(<[^;:{]+>[[:space:]]*)?"
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"(\\{|:[^;\\{()]*\\{)"
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</font> ){}
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};
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<b>bool</b> class_index::grep_callback(<b>const</b> arg_type& what)
|
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{
|
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<font color=
|
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#000080> <i>// what[0] contains the whole string</i>
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<i>// what[5] contains the class name.</i>
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<i>// what[6] contains the template specialisation if any.</i>
|
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<i>// add class name and position to map:</i></font>
|
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index[std::string(what[5].first, what[5].second) + std::string(what[6].first, what[6].second)] =
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what[5].first - base;
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<b>return</b> <b>true</b>;
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}
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<b>void</b> class_index::IndexClasses(<b>const</b> std::string& file)
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{
|
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std::string::const_iterator start, end;
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start = file.begin();
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end = file.end();
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base = start;
|
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class_index::grep_callback_type cl = &(<b>this</b>->grep_callback);
|
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regex_grep(cl,
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start,
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end,
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expression);
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}
|
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</pre>
|
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<p></p>
|
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<hr>
|
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<p>Revised
|
|
|
|
|
|
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
2003-10-24 10:51:38 +00:00
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24 Oct 2003
|
2003-05-17 11:45:48 +00:00
|
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|
<!--webbot bot="Timestamp" endspan i-checksum="39359" --></p>
|
2003-10-24 10:51:38 +00:00
|
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|
<p><i><EFBFBD> Copyright John Maddock 1998-
|
2003-05-17 11:45:48 +00:00
|
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%Y" startspan -->
|
2003-10-24 10:51:38 +00:00
|
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|
2003<!--webbot bot="Timestamp" endspan i-checksum="39359" --></i></p>
|
|
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|
|
<P><I>Use, modification and distribution are subject to the Boost Software License,
|
|
|
|
|
|
Version 1.0. (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>)</I></P>
|
2003-05-17 11:45:48 +00:00
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</body>
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</html>
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