376 lines
12 KiB
C++
376 lines
12 KiB
C++
/*=========================================================================
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Program: Insight Segmentation & Registration Toolkit
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Module: $RCSfile$
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Language: C++
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Date: $Date$
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Version: $Revision$
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Copyright (c) 2002 Insight Consortium. All rights reserved.
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notices for more information.
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=========================================================================*/
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// Original Copyright notice:
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// Copyright (C) 1991 Texas Instruments Incorporated.
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//
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// Permission is granted to any individual or institution to use, copy, modify,
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// and distribute this software, provided that this complete copyright and
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// permission notice is maintained, intact, in all copies and supporting
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// documentation.
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//
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// Texas Instruments Incorporated provides this software "as is" without
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// express or implied warranty.
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//
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// Created: MNF 06/13/89 Initial Design and Implementation
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// Updated: LGO 08/09/89 Inherit from Generic
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// Updated: MBN 09/07/89 Added conditional exception handling
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// Updated: MBN 12/15/89 Sprinkled "const" qualifiers all over the place!
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// Updated: DLS 03/22/91 New lite version
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//
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#ifndef cmRegularExpression_h
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#define cmRegularExpression_h
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#include "cmStandardIncludes.h"
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const int NSUBEXP = 10;
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/** \class cmRegularExpression
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* \brief Implements pattern matching with regular expressions.
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*
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* This is the header file for the regular expression class. An object of
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* this class contains a regular expression, in a special "compiled" format.
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* This compiled format consists of several slots all kept as the objects
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* private data. The cmRegularExpression class provides a convenient way to
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* represent regular expressions. It makes it easy to search for the same
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* regular expression in many different strings without having to compile a
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* string to regular expression format more than necessary.
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*
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* This class implements pattern matching via regular expressions.
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* A regular expression allows a programmer to specify complex
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* patterns that can be searched for and matched against the
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* character string of a string object. In its simplest form, a
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* regular expression is a sequence of characters used to
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* search for exact character matches. However, many times the
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* exact sequence to be found is not known, or only a match at
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* the beginning or end of a string is desired. The cmRegularExpression regu-
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* lar expression class implements regular expression pattern
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* matching as is found and implemented in many UNIX commands
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* and utilities.
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*
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* Example: The perl code
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*
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* $filename =~ m"([a-z]+)\.cc";
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* print $1;
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*
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* Is written as follows in C++
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*
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* cmRegularExpression re("([a-z]+)\\.cc");
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* re.find(filename);
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* cerr << re.match(1);
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*
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*
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* The regular expression class provides a convenient mechanism
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* for specifying and manipulating regular expressions. The
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* regular expression object allows specification of such pat-
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* terns by using the following regular expression metacharac-
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* ters:
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*
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* ^ Matches at beginning of a line
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*
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* $ Matches at end of a line
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*
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* . Matches any single character
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*
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* [ ] Matches any character(s) inside the brackets
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*
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* [^ ] Matches any character(s) not inside the brackets
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*
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* - Matches any character in range on either side of a dash
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*
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* * Matches preceding pattern zero or more times
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*
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* + Matches preceding pattern one or more times
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*
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* ? Matches preceding pattern zero or once only
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*
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* () Saves a matched expression and uses it in a later match
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*
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* Note that more than one of these metacharacters can be used
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* in a single regular expression in order to create complex
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* search patterns. For example, the pattern [^ab1-9] says to
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* match any character sequence that does not begin with the
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* characters "ab" followed by numbers in the series one
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* through nine.
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*
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* There are three constructors for cmRegularExpression. One just creates an
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* empty cmRegularExpression object. Another creates a cmRegularExpression
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* object and initializes it with a regular expression that is given in the
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* form of a char*. The third takes a reference to a cmRegularExpression
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* object as an argument and creates an object initialized with the
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* information from the given cmRegularExpression object.
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*
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* The find member function finds the first occurence of the regualr
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* expression of that object in the string given to find as an argument. Find
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* returns a boolean, and if true, mutates the private data appropriately.
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* Find sets pointers to the beginning and end of the thing last found, they
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* are pointers into the actual string that was searched. The start and end
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* member functions return indicies into the searched string that correspond
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* to the beginning and end pointers respectively. The compile member
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* function takes a char* and puts the compiled version of the char* argument
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* into the object's private data fields. The == and != operators only check
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* the to see if the compiled regular expression is the same, and the
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* deep_equal functions also checks to see if the start and end pointers are
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* the same. The is_valid function returns false if program is set to NULL,
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* (i.e. there is no valid compiled exression). The set_invalid function sets
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* the program to NULL (Warning: this deletes the compiled expression). The
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* following examples may help clarify regular expression usage:
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*
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* * The regular expression "^hello" matches a "hello" only at the
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* beginning of a line. It would match "hello there" but not "hi,
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* hello there".
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*
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* * The regular expression "long$" matches a "long" only at the end
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* of a line. It would match "so long\0", but not "long ago".
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*
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* * The regular expression "t..t..g" will match anything that has a
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* "t" then any two characters, another "t", any two characters and
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* then a "g". It will match "testing", or "test again" but would
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* not match "toasting"
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*
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* * The regular expression "[1-9ab]" matches any number one through
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* nine, and the characters "a" and "b". It would match "hello 1"
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* or "begin", but would not match "no-match".
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*
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* * The regular expression "[^1-9ab]" matches any character that is
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* not a number one through nine, or an "a" or "b". It would NOT
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* match "hello 1" or "begin", but would match "no-match".
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*
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* * The regular expression "br* " matches something that begins with
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* a "b", is followed by zero or more "r"s, and ends in a space. It
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* would match "brrrrr ", and "b ", but would not match "brrh ".
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*
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* * The regular expression "br+ " matches something that begins with
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* a "b", is followed by one or more "r"s, and ends in a space. It
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* would match "brrrrr ", and "br ", but would not match "b " or
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* "brrh ".
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*
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* * The regular expression "br? " matches something that begins with
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* a "b", is followed by zero or one "r"s, and ends in a space. It
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* would match "br ", and "b ", but would not match "brrrr " or
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* "brrh ".
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*
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* * The regular expression "(..p)b" matches something ending with pb
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* and beginning with whatever the two characters before the first p
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* encounterd in the line were. It would find "repb" in "rep drepa
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* qrepb". The regular expression "(..p)a" would find "repa qrepb"
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* in "rep drepa qrepb"
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*
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* * The regular expression "d(..p)" matches something ending with p,
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* beginning with d, and having two characters in between that are
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* the same as the two characters before the first p encounterd in
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* the line. It would match "drepa qrepb" in "rep drepa qrepb".
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*
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*/
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class CM_EXPORT cmRegularExpression
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{
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public:
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/**
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* Instantiate cmRegularExpression with program=NULL.
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*/
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inline cmRegularExpression ();
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/**
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* Instantiate cmRegularExpression with compiled char*.
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*/
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inline cmRegularExpression (char const*);
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/**
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* Instantiate cmRegularExpression as a copy of another regular expression.
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*/
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cmRegularExpression (cmRegularExpression const&);
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/**
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* Destructor.
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*/
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inline ~cmRegularExpression();
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/**
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* Compile a regular expression into internal code
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* for later pattern matching.
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*/
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void compile (char const*);
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/**
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* Matches the regular expression to the given string.
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* Returns true if found, and sets start and end indexes accordingly.
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*/
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bool find (char const*);
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/**
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* Matches the regular expression to the given std string.
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* Returns true if found, and sets start and end indexes accordingly.
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*/
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bool find (std::string const&);
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/**
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* Index to start of first find.
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*/
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inline std::string::size_type start() const;
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/**
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* Index to end of first find.
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*/
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inline std::string::size_type end() const;
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/**
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* Returns true if two regular expressions have the same
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* compiled program for pattern matching.
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*/
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bool operator== (cmRegularExpression const&) const;
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/**
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* Returns true if two regular expressions have different
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* compiled program for pattern matching.
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*/
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inline bool operator!= (cmRegularExpression const&) const;
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/**
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* Returns true if have the same compiled regular expressions
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* and the same start and end pointers.
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*/
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bool deep_equal (cmRegularExpression const&) const;
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/**
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* True if the compiled regexp is valid.
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*/
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inline bool is_valid() const;
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/**
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* Marks the regular expression as invalid.
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*/
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inline void set_invalid();
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/**
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* Destructor.
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*/
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// awf added
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std::string::size_type start(int n) const;
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std::string::size_type end(int n) const;
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std::string match(int n) const;
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private:
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const char* startp[NSUBEXP];
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const char* endp[NSUBEXP];
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char regstart; // Internal use only
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char reganch; // Internal use only
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const char* regmust; // Internal use only
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int regmlen; // Internal use only
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char* program;
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int progsize;
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const char* searchstring;
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};
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/**
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* Create an empty regular expression.
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*/
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inline cmRegularExpression::cmRegularExpression ()
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{
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this->program = NULL;
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}
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/**
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* Creates a regular expression from string s, and
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* compiles s.
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*/
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inline cmRegularExpression::cmRegularExpression (const char* s)
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{
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this->program = NULL;
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compile(s);
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}
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/**
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* Destroys and frees space allocated for the regular expression.
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*/
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inline cmRegularExpression::~cmRegularExpression ()
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{
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//#ifndef WIN32
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delete [] this->program;
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//#endif
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}
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/**
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* Set the start position for the regular expression.
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*/
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inline std::string::size_type cmRegularExpression::start () const
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{
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return(this->startp[0] - searchstring);
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}
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/**
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* Returns the start/end index of the last item found.
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*/
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inline std::string::size_type cmRegularExpression::end () const
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{
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return(this->endp[0] - searchstring);
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}
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/**
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* Returns true if two regular expressions have different
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* compiled program for pattern matching.
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*/
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inline bool cmRegularExpression::operator!= (const cmRegularExpression& r) const
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{
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return(!(*this == r));
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}
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/**
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* Returns true if a valid regular expression is compiled
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* and ready for pattern matching.
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*/
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inline bool cmRegularExpression::is_valid () const
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{
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return (this->program != NULL);
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}
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inline void cmRegularExpression::set_invalid ()
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{
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//#ifndef WIN32
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delete [] this->program;
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//#endif
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this->program = NULL;
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}
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/**
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* Return start index of nth submatch. start(0) is the start of the full match.
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*/
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inline std::string::size_type cmRegularExpression::start(int n) const
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{
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return this->startp[n] - searchstring;
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}
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/**
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* Return end index of nth submatch. end(0) is the end of the full match.
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*/
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inline std::string::size_type cmRegularExpression::end(int n) const
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{
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return this->endp[n] - searchstring;
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}
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/**
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* Return nth submatch as a string.
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*/
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inline std::string cmRegularExpression::match(int n) const
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{
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return std::string(this->startp[n], this->endp[n] - this->startp[n]);
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}
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#endif // cmRegularExpressionh
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