#ifndef __PATTERN_H__ #define __PATTERN_H__ #ifdef _WIN32 #pragma warning(disable:4786) #endif #include #include #include "bkstring.h" class Matcher; class NFANode; class NFAQuantifierNode; /** This pattern class is very similar in functionality to Java's java.util.regex.Pattern class. The pattern class represents an immutable regular expression object. Instead of having a single object contain both the regular expression object and the matching object, instead the two objects are split apart. The {@link Matcher Matcher} class represents the maching object. The Pattern class works primarily off of "compiled" patterns. A typical instantiation of a regular expression looks like: 
  Pattern * p = Pattern::compile("a*b");
  Matcher * m = p->createMatcher("aaaaaab");
  if (m->matches()) ...
However, if you do not need to use a pattern more than once, it is often times okay to use the Pattern's static methods insteads. An example looks like this: 
  if (Pattern::matches("a*b", "aaaab")) { ... }
This class does not currently support unicode. The unicode update for this class is coming soon. This class is partially immutable. It is completely safe to call createMatcher concurrently in different threads, but the other functions (e.g. split) should not be called concurrently on the same Pattern.
Construct Matches
 
Characters
x The character x
\\ The character \
\0nn The character with octal ASCII value nn
\0nnn The character with octal ASCII value nnn
\xhh The character with hexadecimal ASCII value hh
\t A tab character
\r A carriage return character
\n A new-line character
 
Character Classes
[abc] Either a, b, or c
[^abc] Any character but a, b, or c
[a-zA-Z] Any character ranging from a thru z, or A thru Z
[^a-zA-Z] Any character except those ranging from a thru z, or A thru Z
[a\-z] Either a, -, or z
[a-z[A-Z]] Same as [a-zA-Z]
[a-z&&[g-i]] Any character in the intersection of a-z and g-i
[a-z&&[^g-i]] Any character in a-z and not in g-i
 
Prefefined character classes
. Any character. Multiline matching must be compiled into the pattern for . to match a \r or a \n. Even if multiline matching is enabled, . will not match a \r\n, only a \r or a \n.
\d [0-9]
\D [^\d]
\s [ \t\r\n\x0B]
\S [^\s]
\w [a-zA-Z0-9_]
\W [^\w]
 
POSIX character classes
\p{Lower} [a-z]
\p{Upper} [A-Z]
\p{ASCII} [\x00-\x7F]
\p{Alpha} [a-zA-Z]
\p{Digit} [0-9]
\p{Alnum} [\w&&[^_]]
\p{Punct} [!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~]
\p{XDigit} [a-fA-F0-9]
 
Boundary Matches
^ The beginning of a line. Also matches the beginning of input.
$ The end of a line. Also matches the end of input.
\b A word boundary
\B A non word boundary
\A The beginning of input
\G The end of the previous match. Ensures that a "next" match will only happen if it begins with the character immediately following the end of the "current" match.
\Z The end of input. Will also match if there is a single trailing \r\n, a single trailing \r, or a single trailing \n.
\z The end of input
 
Greedy Quantifiers
x? x, either zero times or one time
x* x, zero or more times
x+ x, one or more times
x{n} x, exactly n times
x{n,} x, at least n times
x{,m} x, at most m times
x{n,m} x, at least n times and at most m times
 
Possessive Quantifiers
x?+ x, either zero times or one time
x*+ x, zero or more times
x++ x, one or more times
x{n}+ x, exactly n times
x{n,}+ x, at least n times
x{,m}+ x, at most m times
x{n,m}+ x, at least n times and at most m times
 
Reluctant Quantifiers
x?? x, either zero times or one time
x*? x, zero or more times
x+? x, one or more times
x{n}? x, exactly n times
x{n,}? x, at least n times
x{,m}? x, at most m times
x{n,m}? x, at least n times and at most m times
 
Operators
xy x then y
x|y x or y
(x) x as a capturing group
 
Quoting
\Q Nothing, but treat every character (including \s) literally until a matching \E
\E Nothing, but ends its matching \Q
 
Special Constructs
(?:x) x, but not as a capturing group
(?=x) x, via positive lookahead. This means that the expression will match only if it is trailed by x. It will not "eat" any of the characters matched by x.
(?!x) x, via negative lookahead. This means that the expression will match only if it is not trailed by x. It will not "eat" any of the characters matched by x.
(?<=x) x, via positive lookbehind. x cannot contain any quantifiers.
(?x) x, via negative lookbehind. x cannot contain any quantifiers.
(?>x) x{1}+
 
Registered Expression Matching
{x} The registered pattern x
Begin Text Extracted And Modified From java.util.regex.Pattern documentation

Backslashes, escapes, and quoting

The backslash character ('\') serves to introduce escaped constructs, as defined in the table above, as well as to quote characters that otherwise would be interpreted as unescaped constructs. Thus the expression \\ matches a single backslash and \{ matches a left brace.

It is an error to use a backslash prior to any alphabetic character that does not denote an escaped construct; these are reserved for future extensions to the regular-expression language. A backslash may be used prior to a non-alphabetic character regardless of whether that character is part of an unescaped construct.

It is necessary to double backslashes in string literals that represent regular expressions to protect them from interpretation by a compiler. The string literal "\b", for example, matches a single backspace character when interpreted as a regular expression, while "\\b" matches a word boundary. The string litera "\(hello\)" is illegal and leads to a compile-time error; in order to match the string (hello) the string literal "\\(hello\\)" must be used.

Character Classes

Character classes may appear within other character classes, and may be composed by the union operator (implicit) and the intersection operator (&&). The union operator denotes a class that contains every character that is in at least one of its operand classes. The intersection operator denotes a class that contains every character that is in both of its operand classes.

The precedence of character-class operators is as follows, from highest to lowest:

1     Literal escape     \x
2     Range a-z
3     Grouping [...]
4     Intersection [a-z&&[aeiou]]
5     Union [a-e][i-u]

Note that a different set of metacharacters are in effect inside a character class than outside a character class. For instance, the regular expression . loses its special meaning inside a character class, while the expression - becomes a range forming metacharacter.

Groups and capturing

Capturing groups are numbered by counting their opening parentheses from left to right. In the expression ((A)(B(C))), for example, there are four such groups:

1     ((A)(B(C)))
2     (A)
3     (B(C))
4     (C)

Group zero always stands for the entire expression.

Capturing groups are so named because, during a match, each subsequence of the input sequence that matches such a group is saved. The captured subsequence may be used later in the expression, via a back reference, and may also be retrieved from the matcher once the match operation is complete.

The captured input associated with a group is always the subsequence that the group most recently matched. If a group is evaluated a second time because of quantification then its previously-captured value, if any, will be retained if the second evaluation fails. Matching the string "aba" against the expression (a(b)?)+, for example, leaves group two set to "b". All captured input is discarded at the beginning of each match.

Groups beginning with (? are pure, non-capturing groups that do not capture text and do not count towards the group total.

Unicode support

Coming Soon.

Comparison to Perl 5

The Pattern engine performs traditional NFA-based matching with ordered alternation as occurs in Perl 5.

Perl constructs not supported by this class:

  • The conditional constructs (?{X}) and (?(condition)X|Y),

  • The embedded code constructs (?{code}) and (??{code}),

  • The embedded comment syntax (?#comment), and

  • The preprocessing operations \l \u, \L, and \U.

  • Embedded flags

Constructs supported by this class but not by Perl:

  • Possessive quantifiers, which greedily match as much as they can and do not back off, even when doing so would allow the overall match to succeed.

  • Character-class union and intersection as described above.

Notable differences from Perl:

  • In Perl, \1 through \9 are always interpreted as back references; a backslash-escaped number greater than 9 is treated as a back reference if at least that many subexpressions exist, otherwise it is interpreted, if possible, as an octal escape. In this class octal escapes must always begin with a zero. In this class, \1 through \9 are always interpreted as back references, and a larger number is accepted as a back reference if at least that many subexpressions exist at that point in the regular expression, otherwise the parser will drop digits until the number is smaller or equal to the existing number of groups or it is one digit.

  • Perl uses the g flag to request a match that resumes where the last match left off. This functionality is provided implicitly by the Matcher class: Repeated invocations of the find method will resume where the last match left off, unless the matcher is reset.

  • Perl is forgiving about malformed matching constructs, as in the expression *a, as well as dangling brackets, as in the expression abc], and treats them as literals. This class also strict and will not compile a pattern when dangling characters are encountered.

For a more precise description of the behavior of regular expression constructs, please see Mastering Regular Expressions, 2nd Edition, Jeffrey E. F. Friedl, O'Reilly and Associates, 2002.

End Text Extracted And Modified From java.util.regex.Pattern documentation

@author Jeffery Stuart @since March 2003, Stable Since November 2004 @version 1.07.00 @memo A class used to represent "PERL 5"-ish regular expressions */ class Pattern { friend class Matcher; friend class NFANode; friend class NFAQuantifierNode; private: /** This constructor should not be called directly. Those wishing to use the Pattern class should instead use the {@link compile compile} method. @param rhs The pattern to compile @memo Creates a new pattern from the regular expression in rhs. */ Pattern(const bkstring & rhs); protected: /** This currently is not used, so don't try to do anything with it. @memo Holds all the compiled patterns for quick access. */ static std::map compiledPatterns; /** Holds all of the registered patterns as strings. Due to certain problems with compilation of patterns, especially with capturing groups, this seemed to be the best way to do it. */ static std::map > registeredPatterns; protected: /** Holds all the NFA nodes used. This makes deletion of a pattern, as well as clean-up from an unsuccessful compile much easier and faster. */ std::map nodes; /** Used when methods like split are called. The matcher class uses a lot of dynamic memeory, so having an instance increases speedup of certain operations. */ Matcher * matcher; /** The front node of the NFA. */ NFANode * head; /** The actual regular expression we rerpesent */ bkstring pattern; /** Flag used during compilation. Once the pattern is successfully compiled, error is no longer used. */ bool error; /** Used during compilation to keep track of the current index into {@link pattern pattern}. Once the pattern is successfully compiled, error is no longer used. */ int curInd; /** The number of capture groups this contains. */ int groupCount; /** The number of non-capture groups this contains. */ int nonCapGroupCount; /** The flags specified when this was compiled. */ unsigned long flags; protected: /** Raises an error during compilation. Compilation will cease at that point and compile will return NULL. */ void raiseError(); /** Convenience function for registering a node in nodes. @param node The node to register @return The registered node */ NFANode * registerNode(NFANode * node); /** Calculates the union of two strings. This function will first sort the strings and then use a simple selection algorithm to find the union. @param s1 The first "class" to union @param s2 The second "class" to union @return A new string containing all unique characters. Each character must have appeared in one or both of s1 and s2. */ bkstring classUnion (bkstring s1, bkstring s2) const; /** Calculates the intersection of two strings. This function will first sort the strings and then use a simple selection algorithm to find the intersection. @param s1 The first "class" to intersect @param s2 The second "class" to intersect @return A new string containing all unique characters. Each character must have appeared both s1 and s2. */ bkstring classIntersect (bkstring s1, bkstring s2) const; /** Calculates the negation of a string. The negation is the set of all characters between \x00 and \xFF not contained in s1. @param s1 The "class" to be negated. @param s2 The second "class" to intersect @return A new string containing all unique characters. Each character must have appeared both s1 and s2. */ bkstring classNegate (bkstring s1) const; /** Creates a new "class" representing the range from low thru hi. This function will wrap if low > hi. This is a feature, not a buf. Sometimes it is useful to be able to say [\x70-\x10] instead of [\x70-\x7F\x00-\x10]. @param low The beginning character @param hi The ending character @return A new string containing all the characters from low thru hi. */ bkstring classCreateRange(char low, char hi) const; /** Extracts a decimal number from the substring of member-variable {@link pattern pattern} starting at start and ending at end. @param start The starting index in {@link pattern pattern} @param end The last index in {@link pattern pattern} @return The decimal number in {@link pattern pattern} */ int getInt(int start, int end); /** Parses a {n,m} string out of the member-variable {@link pattern pattern} stores the result in sNum and eNum. @param sNum Output parameter. The minimum number of matches required by the curly quantifier are stored here. @param eNum Output parameter. The maximum number of matches allowed by the curly quantifier are stored here. @return Success/Failure. Fails when the curly does not have the proper syntax */ bool quantifyCurly(int & sNum, int & eNum); /** Tries to quantify the currently parsed group. If the group being parsed is indeed quantified in the member-variable {@link pattern pattern}, then the NFA is modified accordingly. @param start The starting node of the current group being parsed @param stop The ending node of the current group being parsed @param gn The group number of the current group being parsed @return The node representing the starting node of the group. If the group becomes quantified, then this node is not necessarily a GroupHead node. */ NFANode * quantifyGroup(NFANode * start, NFANode * stop, const int gn); /** Tries to quantify the last parsed expression. If the character was indeed quantified, then the NFA is modified accordingly. @param newNode The recently created expression node @return The node representing the last parsed expression. If the expression was quantified, return value != newNode */ NFANode * quantify(NFANode * newNode); /** Parses the current class being examined in {@link pattern pattern}. @return A string of unique characters contained in the current class being parsed */ bkstring parseClass(); /** Parses the current POSIX class being examined in {@link pattern pattern}. @return A string of unique characters representing the POSIX class being parsed */ bkstring parsePosix(); /** Returns a string containing the octal character being parsed @return The string contained the octal value being parsed */ bkstring parseOctal(); /** Returns a string containing the hex character being parsed @return The string contained the hex value being parsed */ bkstring parseHex(); /** Returns a new node representing the back reference being parsed @return The new node representing the back reference being parsed */ NFANode * parseBackref(); /** Parses the escape sequence currently being examined. Determines if the escape sequence is a class, a single character, or the beginning of a quotation sequence. @param inv Output parameter. Whether or not to invert the returned class @param quo Output parameter. Whether or not this sequence starts a quotation. @return The characters represented by the class */ bkstring parseEscape(bool & inv, bool & quo); /** Parses a supposed registered pattern currently under compilation. If the sequence of characters does point to a registered pattern, then the registered pattern is appended to *end. The registered pattern is parsed with the current compilation flags. @param end The ending node of the thus-far compiled pattern @return The new end node of the current pattern */ NFANode * parseRegisteredPattern(NFANode ** end); /** Parses a lookbehind expression. Appends the necessary nodes *end. @param pos Positive or negative look behind @param end The ending node of the current pattern @return The new end node of the current pattern */ NFANode * parseBehind(const bool pos, NFANode ** end); /** Parses the current expression and tacks on nodes until a \E is found. @return The end of the current pattern */ NFANode * parseQuote(); /** Parses {@link pattern pattern}. This function is called recursively when an or (|) or a group is encountered. @param inParen Are we currently parsing inside a group @param inOr Are we currently parsing one side of an or (|) @param end The end of the current expression @return The starting node of the NFA constructed from this parse */ NFANode * parse(const bool inParen = 0, const bool inOr = 0, NFANode ** end = NULL); public: /// We should match regardless of case const static unsigned long CASE_INSENSITIVE; /// We are implicitly quoted const static unsigned long LITERAL; /// @memo We should treat a . as [\x00-\x7F] const static unsigned long DOT_MATCHES_ALL; /** ^ and $ should anchor to the beginning and ending of lines, not all input */ const static unsigned long MULTILINE_MATCHING; /** When enabled, only instances of \n are recognized as line terminators */ const static unsigned long UNIX_LINE_MODE; /// The absolute minimum number of matches a quantifier can match (0) const static int MIN_QMATCH; /// The absolute maximum number of matches a quantifier can match (0x7FFFFFFF) const static int MAX_QMATCH; public: /** Call this function to compile a regular expression into a Pattern object. Special values can be assigned to mode when certain non-standard behaviors are expected from the Pattern object. @param pattern The regular expression to compile @param mode A bitwise or of flags signalling what special behaviors are wanted from this Pattern object @return If successful, compile returns a Pattern pointer. Upon failure, compile returns NULL */ static Pattern * compile (const bkstring & pattern, const unsigned long mode = 0); /** Dont use this function. This function will compile a pattern, and cache the result. This will eventually be used as an optimization when people just want to call static methods using the same pattern over and over instead of first compiling the pattern and then using the compiled instance for matching. @param pattern The regular expression to compile @param mode A bitwise or of flags signalling what special behaviors are wanted from this Pattern object @return If successful, compileAndKeep returns a Pattern pointer. Upon failure, compile returns NULL. */ static Pattern * compileAndKeep (const bkstring & pattern, const unsigned long mode = 0); /** Searches through replace and replaces all substrings matched by pattern with str. str may contain backreferences (e.g. \1) to capture groups. A typical invocation looks like:

Pattern::replace("(a+)b(c+)", "abcccbbabcbabc", "\\2b\\1");

which would replace abcccbbabcbabc with cccbabbcbabcba. @param pattern The regular expression @param str The replacement text @param replacementText The string in which to perform replacements @param mode The special mode requested of the Pattern during the replacement process @return The text with the replacement string substituted where necessary */ static bkstring replace (const bkstring & pattern, const bkstring & str, const bkstring & replacementText, const unsigned long mode = 0); /** Splits the specified string over occurrences of the specified pattern. Empty strings can be optionally ignored. The number of strings returned is configurable. A typical invocation looks like:

bkstring str(strSize, '\0');
FILE * fp = fopen(fileName, "r");
fread((char*)str.data(), strSize, 1, fp);
fclose(fp);

std::vector<bkstring> lines = Pattern::split("[\r\n]+", str, true);

 @param pattern The regular expression @param replace The string to split @param keepEmptys Whether or not to keep empty strings @param limit The maximum number of splits to make @param mode The special mode requested of the Pattern during the split process @return All substrings of str split across pattern. */ static std::vector split (const bkstring & pattern, const bkstring & str, const bool keepEmptys = 0, const unsigned long limit = 0, const unsigned long mode = 0); /** Finds all the instances of the specified pattern within the string. You should be careful to only pass patterns with a minimum length of one. For example, the pattern a* can be matched by an empty string, so instead you should pass a+ since at least one character must be matched. A typical invocation of findAll looks like:

std::vector<td::string> numbers = Pattern::findAll("\\d+", string);

@param pattern The pattern for which to search @param str The string to search @param mode The special mode requested of the Pattern during the find process @return All instances of pattern in str */ static std::vector findAll (const bkstring & pattern, const bkstring & str, const unsigned long mode = 0); /** Determines if an entire string matches the specified pattern @param pattern The pattern for to match @param str The string to match @param mode The special mode requested of the Pattern during the replacement process @return True if str is recognized by pattern */ static bool matches (const bkstring & pattern, const bkstring & str, const unsigned long mode = 0); /** Registers a pattern under a specific name for use in later compilations. A typical invocation and later use looks like:

Pattern::registerPattern("ip", "(?:\\d{1,3}\\.){3}\\d{1,3}");
Pattern * p1 = Pattern::compile("{ip}:\\d+");
Pattern * p2 = Pattern::compile("Connection from ({ip}) on port \\d+");

Multiple calls to registerPattern with the same name will result in the pattern getting overwritten. @param name The name to give to the pattern @param pattern The pattern to register @param mode Any special flags to use when compiling pattern @return Success/Failure. Fails only if pattern has invalid syntax */ static bool registerPattern(const bkstring & name, const bkstring & pattern, const unsigned long mode = 0); /** Clears the pattern registry */ static void unregisterPatterns(); /** Don't use */ static void clearPatternCache(); /** Searches through a string for the nth match of the given pattern in the string. Match indeces start at zero, not one. A typical invocation looks like this:

std::pair<bkstring, int> match = Pattern::findNthMatch("\\d{1,3}", "192.168.1.101:22", 1);
printf("%s %i\n", match.first.c_str(), match.second);

Output: 168 4

@param pattern The pattern for which to search @param str The string to search @param matchNum Which match to find @param mode Any special flags to use during the matching process @return A string and an integer. The string is the string matched. The integer is the starting location of the matched string in str. You can check for success/failure by making sure that the integer returned is greater than or equal to zero. */ static std::pair findNthMatch (const bkstring & pattern, const bkstring & str, const int matchNum, const unsigned long mode = 0); public: /** Deletes all NFA nodes allocated during compilation */ ~Pattern(); bkstring replace (const bkstring & str, const bkstring & replacementText); std::vector split (const bkstring & str, const bool keepEmptys = 0, const unsigned long limit = 0); std::vector findAll (const bkstring & str); bool matches (const bkstring & str); /** Returns the flags used during compilation of this pattern @return The flags used during compilation of this pattern */ unsigned long getFlags () const; /** Returns the regular expression this pattern represents @return The regular expression this pattern represents */ bkstring getPattern () const; /** Creates a matcher object using the specified string and this pattern. @param str The string to match against @return A new matcher using object using this pattern and the specified string */ Matcher * createMatcher (const bkstring & str); }; class NFANode { friend class Matcher; public: NFANode * next; NFANode(); virtual ~NFANode(); virtual void findAllNodes(std::map & soFar); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const = 0; inline virtual bool isGroupHeadNode() const { return false; } inline virtual bool isStartOfInputNode() const { return false; } }; class NFACharNode : public NFANode { protected: char ch; public: NFACharNode(const char c); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFACICharNode : public NFANode { protected: char ch; public: NFACICharNode(const char c); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAStartNode : public NFANode { public: NFAStartNode(); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAEndNode : public NFANode { public: NFAEndNode(); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAQuantifierNode : public NFANode { public: int min, max; NFANode * inner; virtual void findAllNodes(std::map & soFar); NFAQuantifierNode(Pattern * pat, NFANode * internal, const int minMatch = Pattern::MIN_QMATCH, const int maxMatch = Pattern::MAX_QMATCH); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAGreedyQuantifierNode : public NFAQuantifierNode { public: NFAGreedyQuantifierNode(Pattern * pat, NFANode * internal, const int minMatch = Pattern::MIN_QMATCH, const int maxMatch = Pattern::MAX_QMATCH); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; virtual int matchInternal(const bkstring & str, Matcher * matcher, const int curInd, const int soFar) const; }; class NFALazyQuantifierNode : public NFAQuantifierNode { public: NFALazyQuantifierNode(Pattern * pat, NFANode * internal, const int minMatch = Pattern::MIN_QMATCH, const int maxMatch = Pattern::MAX_QMATCH); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAPossessiveQuantifierNode : public NFAQuantifierNode { public: NFAPossessiveQuantifierNode(Pattern * pat, NFANode * internal, const int minMatch = Pattern::MIN_QMATCH, const int maxMatch = Pattern::MAX_QMATCH); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAAcceptNode : public NFANode { public: NFAAcceptNode(); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAClassNode : public NFANode { public: bool inv; std::map vals; NFAClassNode(const bool invert = 0); NFAClassNode(const bkstring & clazz, const bool invert); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFACIClassNode : public NFANode { public: bool inv; std::map vals; NFACIClassNode(const bool invert = 0); NFACIClassNode(const bkstring & clazz, const bool invert); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFASubStartNode : public NFANode { public: NFASubStartNode(); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAOrNode : public NFANode { public: NFANode * one; NFANode * two; NFAOrNode(NFANode * first, NFANode * second); virtual void findAllNodes(std::map & soFar); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAQuoteNode : public NFANode { public: bkstring qStr; NFAQuoteNode(const bkstring & quoted); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFACIQuoteNode : public NFANode { public: bkstring qStr; NFACIQuoteNode(const bkstring & quoted); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFALookAheadNode : public NFANode { public: bool pos; NFANode * inner; NFALookAheadNode(NFANode * internal, const bool positive); virtual void findAllNodes(std::map & soFar); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFALookBehindNode : public NFANode { public: bool pos; bkstring mStr; NFALookBehindNode(const bkstring & str, const bool positive); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAStartOfLineNode : public NFANode { public: NFAStartOfLineNode(); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAEndOfLineNode : public NFANode { public: NFAEndOfLineNode(); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAReferenceNode : public NFANode { public: int gi; NFAReferenceNode(const int groupIndex); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAStartOfInputNode : public NFANode { public: NFAStartOfInputNode(); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; inline virtual bool isStartOfInputNode() const { return true; } }; class NFAEndOfInputNode : public NFANode { public: bool term; NFAEndOfInputNode(const bool lookForTerm); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAWordBoundaryNode : public NFANode { public: bool pos; NFAWordBoundaryNode(const bool positive); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAEndOfMatchNode : public NFANode { public: NFAEndOfMatchNode(); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAGroupHeadNode : public NFANode { public: int gi; NFAGroupHeadNode(const int groupIndex); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; inline virtual bool isGroupHeadNode() const { return true; } }; class NFAGroupTailNode : public NFANode { public: int gi; NFAGroupTailNode(const int groupIndex); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAGroupLoopPrologueNode : public NFANode { public: int gi; NFAGroupLoopPrologueNode(const int groupIndex); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; class NFAGroupLoopNode : public NFANode { public: int gi, min, max, type; NFANode * inner; NFAGroupLoopNode(NFANode * internal, const int minMatch, const int maxMatch, const int groupIndex, const int matchType); virtual void findAllNodes(std::map & soFar); virtual int match(const bkstring & str, Matcher * matcher, const int curInd = 0) const; int matchGreedy(const bkstring & str, Matcher * matcher, const int curInd = 0) const; int matchLazy(const bkstring & str, Matcher * matcher, const int curInd = 0) const; int matchPossessive(const bkstring & str, Matcher * matcher, const int curInd = 0) const; }; #endif