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252 lines
11 KiB
C++
252 lines
11 KiB
C++
//
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// RegularExpression.h
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//
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// Library: Foundation
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// Package: RegExp
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// Module: RegularExpression
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//
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// Definitions of class RegularExpression.
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//
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// A wrapper class for Philip Hazel's PCRE - Perl Compatible Regular Expressions
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// library (http://www.pcre.org).
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_RegularExpression_INCLUDED
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#define Foundation_RegularExpression_INCLUDED
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#include "Poco/Foundation.h"
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#include <vector>
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#include <map>
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namespace Poco {
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class Foundation_API RegularExpression
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/// A class for working with regular expressions.
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/// Implemented using PCRE2, the Perl Compatible
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/// Regular Expressions library by Philip Hazel
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/// (see http://www.pcre.org).
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{
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public:
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enum Options
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/// Some of the following options can only be passed to the constructor;
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/// some can be passed only to matching functions, and some can be used
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/// everywhere.
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///
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/// * Options marked [ctor] can be passed to the constructor.
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/// * Options marked [match] can be passed to match, extract, split and subst.
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/// * Options marked [subst] can be passed to subst.
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///
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/// See the PCRE documentation for more information.
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{
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RE_CASELESS = 0x00000001, /// case insensitive matching (/i) [ctor]
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RE_MULTILINE = 0x00000002, /// enable multi-line mode; affects ^ and $ (/m) [ctor]
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RE_DOTALL = 0x00000004, /// dot matches all characters, including newline (/s) [ctor]
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RE_EXTENDED = 0x00000008, /// totally ignore whitespace (/x) [ctor]
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RE_ANCHORED = 0x00000010, /// treat pattern as if it starts with a ^ [ctor, match]
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RE_DOLLAR_ENDONLY = 0x00000020, /// dollar matches end-of-string only, not last newline in string [ctor]
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RE_EXTRA = 0x00000040, /// enable optional PCRE functionality [ctor]
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RE_NOTBOL = 0x00000080, /// circumflex does not match beginning of string [match]
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RE_NOTEOL = 0x00000100, /// $ does not match end of string [match]
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RE_UNGREEDY = 0x00000200, /// make quantifiers ungreedy [ctor]
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RE_NOTEMPTY = 0x00000400, /// empty string never matches [match]
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RE_UTF8 = 0x00000800, /// assume pattern and subject is UTF-8 encoded [ctor]
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RE_NO_AUTO_CAPTURE = 0x00001000, /// disable numbered capturing parentheses [ctor, match]
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RE_NO_UTF8_CHECK = 0x00002000, /// do not check validity of UTF-8 code sequences [match]
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RE_FIRSTLINE = 0x00040000, /// an unanchored pattern is required to match
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/// before or at the first newline in the subject string,
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/// though the matched text may continue over the newline [ctor]
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RE_DUPNAMES = 0x00080000, /// names used to identify capturing subpatterns need not be unique [ctor]
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RE_NEWLINE_CR = 0x00100000, /// assume newline is CR ('\r'), the default [ctor]
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RE_NEWLINE_LF = 0x00200000, /// assume newline is LF ('\n') [ctor]
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RE_NEWLINE_CRLF = 0x00300000, /// assume newline is CRLF ("\r\n") [ctor]
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RE_NEWLINE_ANY = 0x00400000, /// assume newline is any valid Unicode newline character [ctor]
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RE_NEWLINE_ANYCRLF = 0x00500000, /// assume newline is any of CR, LF, CRLF [ctor]
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RE_GLOBAL = 0x10000000, /// replace all occurences (/g) [subst]
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RE_NO_VARS = 0x20000000 /// treat dollar in replacement string as ordinary character [subst]
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};
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struct Match
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{
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std::string::size_type offset; /// zero based offset (std::string::npos if subexpr does not match)
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std::string::size_type length; /// length of substring
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std::string name; /// name of group
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};
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using MatchVec = std::vector<Match>;
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using GroupMap = std::map<int, std::string>;
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RegularExpression(const std::string& pattern, int options = 0, bool study = true);
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/// Creates a regular expression and parses the given pattern.
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/// Note: the study argument is only provided for backwards compatibility
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/// and is ignored since POCO release 1.12, which uses PCRE2.
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/// For a description of the options, please see the PCRE documentation.
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/// Throws a RegularExpressionException if the patter cannot be compiled.
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~RegularExpression();
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/// Destroys the regular expression.
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int match(const std::string& subject, Match& mtch, int options = 0) const;
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/// Matches the given subject string against the pattern. Returns the position
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/// of the first captured substring in mtch.
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/// If no part of the subject matches the pattern, mtch.offset is std::string::npos and
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/// mtch.length is 0.
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/// Throws a RegularExpressionException in case of an error.
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/// Returns the number of matches.
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int match(const std::string& subject, std::string::size_type offset, Match& mtch, int options = 0) const;
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/// Matches the given subject string, starting at offset, against the pattern.
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/// Returns the position of the captured substring in mtch.
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/// If no part of the subject matches the pattern, mtch.offset is std::string::npos and
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/// mtch.length is 0.
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/// Throws a RegularExpressionException in case of an error.
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/// Returns the number of matches.
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int match(const std::string& subject, std::string::size_type offset, MatchVec& matches, int options = 0) const;
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/// Matches the given subject string against the pattern.
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/// The first entry in matches contains the position of the captured substring.
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/// The following entries identify matching subpatterns. See the PCRE documentation
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/// for a more detailed explanation.
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/// If no part of the subject matches the pattern, matches is empty.
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/// Throws a RegularExpressionException in case of an error.
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/// Returns the number of matches.
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bool match(const std::string& subject, std::string::size_type offset = 0) const;
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/// Returns true if and only if the subject matches the regular expression.
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///
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/// Internally, this method sets the RE_ANCHORED and RE_NOTEMPTY options for
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/// matching, which means that the empty string will never match and
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/// the pattern is treated as if it starts with a ^.
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bool match(const std::string& subject, std::string::size_type offset, int options) const;
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/// Returns true if and only if the subject matches the regular expression.
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bool operator == (const std::string& subject) const;
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/// Returns true if and only if the subject matches the regular expression.
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///
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/// Internally, this method sets the RE_ANCHORED and RE_NOTEMPTY options for
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/// matching, which means that the empty string will never match and
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/// the pattern is treated as if it starts with a ^.
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bool operator != (const std::string& subject) const;
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/// Returns true if and only if the subject does not match the regular expression.
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///
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/// Internally, this method sets the RE_ANCHORED and RE_NOTEMPTY options for
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/// matching, which means that the empty string will never match and
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/// the pattern is treated as if it starts with a ^.
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int extract(const std::string& subject, std::string& str, int options = 0) const;
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/// Matches the given subject string against the pattern.
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/// Returns the captured string.
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/// Throws a RegularExpressionException in case of an error.
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/// Returns the number of matches.
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int extract(const std::string& subject, std::string::size_type offset, std::string& str, int options = 0) const;
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/// Matches the given subject string, starting at offset, against the pattern.
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/// Returns the captured string.
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/// Throws a RegularExpressionException in case of an error.
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/// Returns the number of matches.
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int split(const std::string& subject, std::vector<std::string>& strings, int options = 0) const;
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/// Matches the given subject string against the pattern.
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/// The first entry in captured is the captured substring.
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/// The following entries contain substrings matching subpatterns. See the PCRE documentation
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/// for a more detailed explanation.
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/// If no part of the subject matches the pattern, captured is empty.
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/// Throws a RegularExpressionException in case of an error.
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/// Returns the number of matches.
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int split(const std::string& subject, std::string::size_type offset, std::vector<std::string>& strings, int options = 0) const;
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/// Matches the given subject string against the pattern.
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/// The first entry in captured is the captured substring.
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/// The following entries contain substrings matching subpatterns. See the PCRE documentation
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/// for a more detailed explanation.
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/// If no part of the subject matches the pattern, captured is empty.
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/// Throws a RegularExpressionException in case of an error.
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/// Returns the number of matches.
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int subst(std::string& subject, const std::string& replacement, int options = 0) const;
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/// Substitute in subject all matches of the pattern with replacement.
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/// If RE_GLOBAL is specified as option, all matches are replaced. Otherwise,
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/// only the first match is replaced.
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/// Occurrences of $<n> (for example, $1, $2, ...) in replacement are replaced
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/// with the corresponding captured string. $0 is the original subject string.
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/// Returns the number of replaced occurrences.
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int subst(std::string& subject, std::string::size_type offset, const std::string& replacement, int options = 0) const;
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/// Substitute in subject all matches of the pattern with replacement,
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/// starting at offset.
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/// If RE_GLOBAL is specified as option, all matches are replaced. Otherwise,
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/// only the first match is replaced.
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/// Unless RE_NO_VARS is specified, occurrences of $<n> (for example, $0, $1, $2, ... $9)
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/// in replacement are replaced with the corresponding captured string.
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/// $0 is the captured substring. $1 ... $n are the substrings matching the subpatterns.
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/// Returns the number of replaced occurrences.
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static bool match(const std::string& subject, const std::string& pattern, int options = 0);
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/// Matches the given subject string against the regular expression given in pattern,
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/// using the given options.
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protected:
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std::string::size_type substOne(std::string& subject, std::string::size_type offset, const std::string& replacement, int options) const;
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static int compileOptions(int options);
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static int matchOptions(int options);
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private:
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// Note: to avoid a dependency on the pcre2.h header the following are
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// declared as void* and casted to the correct type in the implementation file.
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void* _pcre; // Actual type is pcre2_code_8*
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GroupMap _groups;
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RegularExpression();
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RegularExpression(const RegularExpression&);
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RegularExpression& operator = (const RegularExpression&);
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};
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//
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// inlines
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//
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inline int RegularExpression::match(const std::string& subject, Match& mtch, int options) const
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{
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return match(subject, 0, mtch, options);
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}
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inline int RegularExpression::split(const std::string& subject, std::vector<std::string>& strings, int options) const
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{
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return split(subject, 0, strings, options);
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}
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inline int RegularExpression::subst(std::string& subject, const std::string& replacement, int options) const
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{
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return subst(subject, 0, replacement, options);
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}
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inline bool RegularExpression::operator == (const std::string& subject) const
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{
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return match(subject);
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}
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inline bool RegularExpression::operator != (const std::string& subject) const
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{
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return !match(subject);
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}
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} // namespace Poco
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#endif // Foundation_RegularExpression_INCLUDED
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