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- // Copyright (c) 2005, Google Inc.
- // All rights reserved.
- //
- // Redistribution and use in source and binary forms, with or without
- // modification, are permitted provided that the following conditions are
- // met:
- //
- // * Redistributions of source code must retain the above copyright
- // notice, this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above
- // copyright notice, this list of conditions and the following disclaimer
- // in the documentation and/or other materials provided with the
- // distribution.
- // * Neither the name of Google Inc. nor the names of its
- // contributors may be used to endorse or promote products derived from
- // this software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- //
- // Author: Sanjay Ghemawat
- // Support for PCRE_XXX modifiers added by Giuseppe Maxia, July 2005
- #ifndef _PCRECPP_H
- #define _PCRECPP_H
- // C++ interface to the pcre regular-expression library. RE supports
- // Perl-style regular expressions (with extensions like \d, \w, \s,
- // ...).
- //
- // -----------------------------------------------------------------------
- // REGEXP SYNTAX:
- //
- // This module is part of the pcre library and hence supports its syntax
- // for regular expressions.
- //
- // The syntax is pretty similar to Perl's. For those not familiar
- // with Perl's regular expressions, here are some examples of the most
- // commonly used extensions:
- //
- // "hello (\\w+) world" -- \w matches a "word" character
- // "version (\\d+)" -- \d matches a digit
- // "hello\\s+world" -- \s matches any whitespace character
- // "\\b(\\w+)\\b" -- \b matches empty string at a word boundary
- // "(?i)hello" -- (?i) turns on case-insensitive matching
- // "/\\*(.*?)\\*/" -- .*? matches . minimum no. of times possible
- //
- // -----------------------------------------------------------------------
- // MATCHING INTERFACE:
- //
- // The "FullMatch" operation checks that supplied text matches a
- // supplied pattern exactly.
- //
- // Example: successful match
- // pcrecpp::RE re("h.*o");
- // re.FullMatch("hello");
- //
- // Example: unsuccessful match (requires full match):
- // pcrecpp::RE re("e");
- // !re.FullMatch("hello");
- //
- // Example: creating a temporary RE object:
- // pcrecpp::RE("h.*o").FullMatch("hello");
- //
- // You can pass in a "const char*" or a "string" for "text". The
- // examples below tend to use a const char*.
- //
- // You can, as in the different examples above, store the RE object
- // explicitly in a variable or use a temporary RE object. The
- // examples below use one mode or the other arbitrarily. Either
- // could correctly be used for any of these examples.
- //
- // -----------------------------------------------------------------------
- // MATCHING WITH SUB-STRING EXTRACTION:
- //
- // You can supply extra pointer arguments to extract matched subpieces.
- //
- // Example: extracts "ruby" into "s" and 1234 into "i"
- // int i;
- // string s;
- // pcrecpp::RE re("(\\w+):(\\d+)");
- // re.FullMatch("ruby:1234", &s, &i);
- //
- // Example: does not try to extract any extra sub-patterns
- // re.FullMatch("ruby:1234", &s);
- //
- // Example: does not try to extract into NULL
- // re.FullMatch("ruby:1234", NULL, &i);
- //
- // Example: integer overflow causes failure
- // !re.FullMatch("ruby:1234567891234", NULL, &i);
- //
- // Example: fails because there aren't enough sub-patterns:
- // !pcrecpp::RE("\\w+:\\d+").FullMatch("ruby:1234", &s);
- //
- // Example: fails because string cannot be stored in integer
- // !pcrecpp::RE("(.*)").FullMatch("ruby", &i);
- //
- // The provided pointer arguments can be pointers to any scalar numeric
- // type, or one of
- // string (matched piece is copied to string)
- // StringPiece (StringPiece is mutated to point to matched piece)
- // T (where "bool T::ParseFrom(const char*, int)" exists)
- // NULL (the corresponding matched sub-pattern is not copied)
- //
- // CAVEAT: An optional sub-pattern that does not exist in the matched
- // string is assigned the empty string. Therefore, the following will
- // return false (because the empty string is not a valid number):
- // int number;
- // pcrecpp::RE::FullMatch("abc", "[a-z]+(\\d+)?", &number);
- //
- // -----------------------------------------------------------------------
- // DO_MATCH
- //
- // The matching interface supports at most 16 arguments per call.
- // If you need more, consider using the more general interface
- // pcrecpp::RE::DoMatch(). See pcrecpp.h for the signature for DoMatch.
- //
- // -----------------------------------------------------------------------
- // PARTIAL MATCHES
- //
- // You can use the "PartialMatch" operation when you want the pattern
- // to match any substring of the text.
- //
- // Example: simple search for a string:
- // pcrecpp::RE("ell").PartialMatch("hello");
- //
- // Example: find first number in a string:
- // int number;
- // pcrecpp::RE re("(\\d+)");
- // re.PartialMatch("x*100 + 20", &number);
- // assert(number == 100);
- //
- // -----------------------------------------------------------------------
- // UTF-8 AND THE MATCHING INTERFACE:
- //
- // By default, pattern and text are plain text, one byte per character.
- // The UTF8 flag, passed to the constructor, causes both pattern
- // and string to be treated as UTF-8 text, still a byte stream but
- // potentially multiple bytes per character. In practice, the text
- // is likelier to be UTF-8 than the pattern, but the match returned
- // may depend on the UTF8 flag, so always use it when matching
- // UTF8 text. E.g., "." will match one byte normally but with UTF8
- // set may match up to three bytes of a multi-byte character.
- //
- // Example:
- // pcrecpp::RE_Options options;
- // options.set_utf8();
- // pcrecpp::RE re(utf8_pattern, options);
- // re.FullMatch(utf8_string);
- //
- // Example: using the convenience function UTF8():
- // pcrecpp::RE re(utf8_pattern, pcrecpp::UTF8());
- // re.FullMatch(utf8_string);
- //
- // NOTE: The UTF8 option is ignored if pcre was not configured with the
- // --enable-utf8 flag.
- //
- // -----------------------------------------------------------------------
- // PASSING MODIFIERS TO THE REGULAR EXPRESSION ENGINE
- //
- // PCRE defines some modifiers to change the behavior of the regular
- // expression engine.
- // The C++ wrapper defines an auxiliary class, RE_Options, as a vehicle
- // to pass such modifiers to a RE class.
- //
- // Currently, the following modifiers are supported
- //
- // modifier description Perl corresponding
- //
- // PCRE_CASELESS case insensitive match /i
- // PCRE_MULTILINE multiple lines match /m
- // PCRE_DOTALL dot matches newlines /s
- // PCRE_DOLLAR_ENDONLY $ matches only at end N/A
- // PCRE_EXTRA strict escape parsing N/A
- // PCRE_EXTENDED ignore whitespaces /x
- // PCRE_UTF8 handles UTF8 chars built-in
- // PCRE_UNGREEDY reverses * and *? N/A
- // PCRE_NO_AUTO_CAPTURE disables matching parens N/A (*)
- //
- // (For a full account on how each modifier works, please check the
- // PCRE API reference manual).
- //
- // (*) Both Perl and PCRE allow non matching parentheses by means of the
- // "?:" modifier within the pattern itself. e.g. (?:ab|cd) does not
- // capture, while (ab|cd) does.
- //
- // For each modifier, there are two member functions whose name is made
- // out of the modifier in lowercase, without the "PCRE_" prefix. For
- // instance, PCRE_CASELESS is handled by
- // bool caseless(),
- // which returns true if the modifier is set, and
- // RE_Options & set_caseless(bool),
- // which sets or unsets the modifier.
- //
- // Moreover, PCRE_EXTRA_MATCH_LIMIT can be accessed through the
- // set_match_limit() and match_limit() member functions.
- // Setting match_limit to a non-zero value will limit the executation of
- // pcre to keep it from doing bad things like blowing the stack or taking
- // an eternity to return a result. A value of 5000 is good enough to stop
- // stack blowup in a 2MB thread stack. Setting match_limit to zero will
- // disable match limiting. Alternately, you can set match_limit_recursion()
- // which uses PCRE_EXTRA_MATCH_LIMIT_RECURSION to limit how much pcre
- // recurses. match_limit() caps the number of matches pcre does;
- // match_limit_recrusion() caps the depth of recursion.
- //
- // Normally, to pass one or more modifiers to a RE class, you declare
- // a RE_Options object, set the appropriate options, and pass this
- // object to a RE constructor. Example:
- //
- // RE_options opt;
- // opt.set_caseless(true);
- //
- // if (RE("HELLO", opt).PartialMatch("hello world")) ...
- //
- // RE_options has two constructors. The default constructor takes no
- // arguments and creates a set of flags that are off by default.
- //
- // The optional parameter 'option_flags' is to facilitate transfer
- // of legacy code from C programs. This lets you do
- // RE(pattern, RE_Options(PCRE_CASELESS|PCRE_MULTILINE)).PartialMatch(str);
- //
- // But new code is better off doing
- // RE(pattern,
- // RE_Options().set_caseless(true).set_multiline(true)).PartialMatch(str);
- // (See below)
- //
- // If you are going to pass one of the most used modifiers, there are some
- // convenience functions that return a RE_Options class with the
- // appropriate modifier already set:
- // CASELESS(), UTF8(), MULTILINE(), DOTALL(), EXTENDED()
- //
- // If you need to set several options at once, and you don't want to go
- // through the pains of declaring a RE_Options object and setting several
- // options, there is a parallel method that give you such ability on the
- // fly. You can concatenate several set_xxxxx member functions, since each
- // of them returns a reference to its class object. e.g.: to pass
- // PCRE_CASELESS, PCRE_EXTENDED, and PCRE_MULTILINE to a RE with one
- // statement, you may write
- //
- // RE(" ^ xyz \\s+ .* blah$", RE_Options()
- // .set_caseless(true)
- // .set_extended(true)
- // .set_multiline(true)).PartialMatch(sometext);
- //
- // -----------------------------------------------------------------------
- // SCANNING TEXT INCREMENTALLY
- //
- // The "Consume" operation may be useful if you want to repeatedly
- // match regular expressions at the front of a string and skip over
- // them as they match. This requires use of the "StringPiece" type,
- // which represents a sub-range of a real string. Like RE, StringPiece
- // is defined in the pcrecpp namespace.
- //
- // Example: read lines of the form "var = value" from a string.
- // string contents = ...; // Fill string somehow
- // pcrecpp::StringPiece input(contents); // Wrap in a StringPiece
- //
- // string var;
- // int value;
- // pcrecpp::RE re("(\\w+) = (\\d+)\n");
- // while (re.Consume(&input, &var, &value)) {
- // ...;
- // }
- //
- // Each successful call to "Consume" will set "var/value", and also
- // advance "input" so it points past the matched text.
- //
- // The "FindAndConsume" operation is similar to "Consume" but does not
- // anchor your match at the beginning of the string. For example, you
- // could extract all words from a string by repeatedly calling
- // pcrecpp::RE("(\\w+)").FindAndConsume(&input, &word)
- //
- // -----------------------------------------------------------------------
- // PARSING HEX/OCTAL/C-RADIX NUMBERS
- //
- // By default, if you pass a pointer to a numeric value, the
- // corresponding text is interpreted as a base-10 number. You can
- // instead wrap the pointer with a call to one of the operators Hex(),
- // Octal(), or CRadix() to interpret the text in another base. The
- // CRadix operator interprets C-style "0" (base-8) and "0x" (base-16)
- // prefixes, but defaults to base-10.
- //
- // Example:
- // int a, b, c, d;
- // pcrecpp::RE re("(.*) (.*) (.*) (.*)");
- // re.FullMatch("100 40 0100 0x40",
- // pcrecpp::Octal(&a), pcrecpp::Hex(&b),
- // pcrecpp::CRadix(&c), pcrecpp::CRadix(&d));
- // will leave 64 in a, b, c, and d.
- //
- // -----------------------------------------------------------------------
- // REPLACING PARTS OF STRINGS
- //
- // You can replace the first match of "pattern" in "str" with
- // "rewrite". Within "rewrite", backslash-escaped digits (\1 to \9)
- // can be used to insert text matching corresponding parenthesized
- // group from the pattern. \0 in "rewrite" refers to the entire
- // matching text. E.g.,
- //
- // string s = "yabba dabba doo";
- // pcrecpp::RE("b+").Replace("d", &s);
- //
- // will leave "s" containing "yada dabba doo". The result is true if
- // the pattern matches and a replacement occurs, or false otherwise.
- //
- // GlobalReplace() is like Replace(), except that it replaces all
- // occurrences of the pattern in the string with the rewrite.
- // Replacements are not subject to re-matching. E.g.,
- //
- // string s = "yabba dabba doo";
- // pcrecpp::RE("b+").GlobalReplace("d", &s);
- //
- // will leave "s" containing "yada dada doo". It returns the number
- // of replacements made.
- //
- // Extract() is like Replace(), except that if the pattern matches,
- // "rewrite" is copied into "out" (an additional argument) with
- // substitutions. The non-matching portions of "text" are ignored.
- // Returns true iff a match occurred and the extraction happened
- // successfully. If no match occurs, the string is left unaffected.
- #include <string>
- #include <pcre.h>
- #include <pcrecpparg.h> // defines the Arg class
- // This isn't technically needed here, but we include it
- // anyway so folks who include pcrecpp.h don't have to.
- #include <pcre_stringpiece.h>
- namespace pcrecpp {
- #define PCRE_SET_OR_CLEAR(b, o) \
- if (b) all_options_ |= (o); else all_options_ &= ~(o); \
- return *this
- #define PCRE_IS_SET(o) \
- (all_options_ & o) == o
- /***** Compiling regular expressions: the RE class *****/
- // RE_Options allow you to set options to be passed along to pcre,
- // along with other options we put on top of pcre.
- // Only 9 modifiers, plus match_limit and match_limit_recursion,
- // are supported now.
- class PCRECPP_EXP_DEFN RE_Options {
- public:
- // constructor
- RE_Options() : match_limit_(0), match_limit_recursion_(0), all_options_(0) {}
- // alternative constructor.
- // To facilitate transfer of legacy code from C programs
- //
- // This lets you do
- // RE(pattern, RE_Options(PCRE_CASELESS|PCRE_MULTILINE)).PartialMatch(str);
- // But new code is better off doing
- // RE(pattern,
- // RE_Options().set_caseless(true).set_multiline(true)).PartialMatch(str);
- RE_Options(int option_flags) : match_limit_(0), match_limit_recursion_(0),
- all_options_(option_flags) {}
- // we're fine with the default destructor, copy constructor, etc.
- // accessors and mutators
- int match_limit() const { return match_limit_; };
- RE_Options &set_match_limit(int limit) {
- match_limit_ = limit;
- return *this;
- }
- int match_limit_recursion() const { return match_limit_recursion_; };
- RE_Options &set_match_limit_recursion(int limit) {
- match_limit_recursion_ = limit;
- return *this;
- }
- bool caseless() const {
- return PCRE_IS_SET(PCRE_CASELESS);
- }
- RE_Options &set_caseless(bool x) {
- PCRE_SET_OR_CLEAR(x, PCRE_CASELESS);
- }
- bool multiline() const {
- return PCRE_IS_SET(PCRE_MULTILINE);
- }
- RE_Options &set_multiline(bool x) {
- PCRE_SET_OR_CLEAR(x, PCRE_MULTILINE);
- }
- bool dotall() const {
- return PCRE_IS_SET(PCRE_DOTALL);
- }
- RE_Options &set_dotall(bool x) {
- PCRE_SET_OR_CLEAR(x, PCRE_DOTALL);
- }
- bool extended() const {
- return PCRE_IS_SET(PCRE_EXTENDED);
- }
- RE_Options &set_extended(bool x) {
- PCRE_SET_OR_CLEAR(x, PCRE_EXTENDED);
- }
- bool dollar_endonly() const {
- return PCRE_IS_SET(PCRE_DOLLAR_ENDONLY);
- }
- RE_Options &set_dollar_endonly(bool x) {
- PCRE_SET_OR_CLEAR(x, PCRE_DOLLAR_ENDONLY);
- }
- bool extra() const {
- return PCRE_IS_SET(PCRE_EXTRA);
- }
- RE_Options &set_extra(bool x) {
- PCRE_SET_OR_CLEAR(x, PCRE_EXTRA);
- }
- bool ungreedy() const {
- return PCRE_IS_SET(PCRE_UNGREEDY);
- }
- RE_Options &set_ungreedy(bool x) {
- PCRE_SET_OR_CLEAR(x, PCRE_UNGREEDY);
- }
- bool utf8() const {
- return PCRE_IS_SET(PCRE_UTF8);
- }
- RE_Options &set_utf8(bool x) {
- PCRE_SET_OR_CLEAR(x, PCRE_UTF8);
- }
- bool no_auto_capture() const {
- return PCRE_IS_SET(PCRE_NO_AUTO_CAPTURE);
- }
- RE_Options &set_no_auto_capture(bool x) {
- PCRE_SET_OR_CLEAR(x, PCRE_NO_AUTO_CAPTURE);
- }
- RE_Options &set_all_options(int opt) {
- all_options_ = opt;
- return *this;
- }
- int all_options() const {
- return all_options_ ;
- }
- // TODO: add other pcre flags
- private:
- int match_limit_;
- int match_limit_recursion_;
- int all_options_;
- };
- // These functions return some common RE_Options
- static inline RE_Options UTF8() {
- return RE_Options().set_utf8(true);
- }
- static inline RE_Options CASELESS() {
- return RE_Options().set_caseless(true);
- }
- static inline RE_Options MULTILINE() {
- return RE_Options().set_multiline(true);
- }
- static inline RE_Options DOTALL() {
- return RE_Options().set_dotall(true);
- }
- static inline RE_Options EXTENDED() {
- return RE_Options().set_extended(true);
- }
- // Interface for regular expression matching. Also corresponds to a
- // pre-compiled regular expression. An "RE" object is safe for
- // concurrent use by multiple threads.
- class PCRECPP_EXP_DEFN RE {
- public:
- // We provide implicit conversions from strings so that users can
- // pass in a string or a "const char*" wherever an "RE" is expected.
- RE(const string& pat) { Init(pat, NULL); }
- RE(const string& pat, const RE_Options& option) { Init(pat, &option); }
- RE(const char* pat) { Init(pat, NULL); }
- RE(const char* pat, const RE_Options& option) { Init(pat, &option); }
- RE(const unsigned char* pat) {
- Init(reinterpret_cast<const char*>(pat), NULL);
- }
- RE(const unsigned char* pat, const RE_Options& option) {
- Init(reinterpret_cast<const char*>(pat), &option);
- }
- // Copy constructor & assignment - note that these are expensive
- // because they recompile the expression.
- RE(const RE& re) { Init(re.pattern_, &re.options_); }
- const RE& operator=(const RE& re) {
- if (this != &re) {
- Cleanup();
- // This is the code that originally came from Google
- // Init(re.pattern_.c_str(), &re.options_);
- // This is the replacement from Ari Pollak
- Init(re.pattern_, &re.options_);
- }
- return *this;
- }
- ~RE();
- // The string specification for this RE. E.g.
- // RE re("ab*c?d+");
- // re.pattern(); // "ab*c?d+"
- const string& pattern() const { return pattern_; }
- // If RE could not be created properly, returns an error string.
- // Else returns the empty string.
- const string& error() const { return *error_; }
- /***** The useful part: the matching interface *****/
- // This is provided so one can do pattern.ReplaceAll() just as
- // easily as ReplaceAll(pattern-text, ....)
- bool FullMatch(const StringPiece& text,
- const Arg& ptr1 = no_arg,
- const Arg& ptr2 = no_arg,
- const Arg& ptr3 = no_arg,
- const Arg& ptr4 = no_arg,
- const Arg& ptr5 = no_arg,
- const Arg& ptr6 = no_arg,
- const Arg& ptr7 = no_arg,
- const Arg& ptr8 = no_arg,
- const Arg& ptr9 = no_arg,
- const Arg& ptr10 = no_arg,
- const Arg& ptr11 = no_arg,
- const Arg& ptr12 = no_arg,
- const Arg& ptr13 = no_arg,
- const Arg& ptr14 = no_arg,
- const Arg& ptr15 = no_arg,
- const Arg& ptr16 = no_arg) const;
- bool PartialMatch(const StringPiece& text,
- const Arg& ptr1 = no_arg,
- const Arg& ptr2 = no_arg,
- const Arg& ptr3 = no_arg,
- const Arg& ptr4 = no_arg,
- const Arg& ptr5 = no_arg,
- const Arg& ptr6 = no_arg,
- const Arg& ptr7 = no_arg,
- const Arg& ptr8 = no_arg,
- const Arg& ptr9 = no_arg,
- const Arg& ptr10 = no_arg,
- const Arg& ptr11 = no_arg,
- const Arg& ptr12 = no_arg,
- const Arg& ptr13 = no_arg,
- const Arg& ptr14 = no_arg,
- const Arg& ptr15 = no_arg,
- const Arg& ptr16 = no_arg) const;
- bool Consume(StringPiece* input,
- const Arg& ptr1 = no_arg,
- const Arg& ptr2 = no_arg,
- const Arg& ptr3 = no_arg,
- const Arg& ptr4 = no_arg,
- const Arg& ptr5 = no_arg,
- const Arg& ptr6 = no_arg,
- const Arg& ptr7 = no_arg,
- const Arg& ptr8 = no_arg,
- const Arg& ptr9 = no_arg,
- const Arg& ptr10 = no_arg,
- const Arg& ptr11 = no_arg,
- const Arg& ptr12 = no_arg,
- const Arg& ptr13 = no_arg,
- const Arg& ptr14 = no_arg,
- const Arg& ptr15 = no_arg,
- const Arg& ptr16 = no_arg) const;
- bool FindAndConsume(StringPiece* input,
- const Arg& ptr1 = no_arg,
- const Arg& ptr2 = no_arg,
- const Arg& ptr3 = no_arg,
- const Arg& ptr4 = no_arg,
- const Arg& ptr5 = no_arg,
- const Arg& ptr6 = no_arg,
- const Arg& ptr7 = no_arg,
- const Arg& ptr8 = no_arg,
- const Arg& ptr9 = no_arg,
- const Arg& ptr10 = no_arg,
- const Arg& ptr11 = no_arg,
- const Arg& ptr12 = no_arg,
- const Arg& ptr13 = no_arg,
- const Arg& ptr14 = no_arg,
- const Arg& ptr15 = no_arg,
- const Arg& ptr16 = no_arg) const;
- bool Replace(const StringPiece& rewrite,
- string *str) const;
- int GlobalReplace(const StringPiece& rewrite,
- string *str) const;
- bool Extract(const StringPiece &rewrite,
- const StringPiece &text,
- string *out) const;
- // Escapes all potentially meaningful regexp characters in
- // 'unquoted'. The returned string, used as a regular expression,
- // will exactly match the original string. For example,
- // 1.5-2.0?
- // may become:
- // 1\.5\-2\.0\?
- // Note QuoteMeta behaves the same as perl's QuoteMeta function,
- // *except* that it escapes the NUL character (\0) as backslash + 0,
- // rather than backslash + NUL.
- static string QuoteMeta(const StringPiece& unquoted);
- /***** Generic matching interface *****/
- // Type of match (TODO: Should be restructured as part of RE_Options)
- enum Anchor {
- UNANCHORED, // No anchoring
- ANCHOR_START, // Anchor at start only
- ANCHOR_BOTH // Anchor at start and end
- };
- // General matching routine. Stores the length of the match in
- // "*consumed" if successful.
- bool DoMatch(const StringPiece& text,
- Anchor anchor,
- int* consumed,
- const Arg* const* args, int n) const;
- // Return the number of capturing subpatterns, or -1 if the
- // regexp wasn't valid on construction.
- int NumberOfCapturingGroups() const;
- // The default value for an argument, to indicate the end of the argument
- // list. This must be used only in optional argument defaults. It should NOT
- // be passed explicitly. Some people have tried to use it like this:
- //
- // FullMatch(x, y, &z, no_arg, &w);
- //
- // This is a mistake, and will not work.
- static Arg no_arg;
- private:
- void Init(const string& pattern, const RE_Options* options);
- void Cleanup();
- // Match against "text", filling in "vec" (up to "vecsize" * 2/3) with
- // pairs of integers for the beginning and end positions of matched
- // text. The first pair corresponds to the entire matched text;
- // subsequent pairs correspond, in order, to parentheses-captured
- // matches. Returns the number of pairs (one more than the number of
- // the last subpattern with a match) if matching was successful
- // and zero if the match failed.
- // I.e. for RE("(foo)|(bar)|(baz)") it will return 2, 3, and 4 when matching
- // against "foo", "bar", and "baz" respectively.
- // When matching RE("(foo)|hello") against "hello", it will return 1.
- // But the values for all subpattern are filled in into "vec".
- int TryMatch(const StringPiece& text,
- int startpos,
- Anchor anchor,
- bool empty_ok,
- int *vec,
- int vecsize) const;
- // Append the "rewrite" string, with backslash subsitutions from "text"
- // and "vec", to string "out".
- bool Rewrite(string *out,
- const StringPiece& rewrite,
- const StringPiece& text,
- int *vec,
- int veclen) const;
- // internal implementation for DoMatch
- bool DoMatchImpl(const StringPiece& text,
- Anchor anchor,
- int* consumed,
- const Arg* const args[],
- int n,
- int* vec,
- int vecsize) const;
- // Compile the regexp for the specified anchoring mode
- pcre* Compile(Anchor anchor);
- string pattern_;
- RE_Options options_;
- pcre* re_full_; // For full matches
- pcre* re_partial_; // For partial matches
- const string* error_; // Error indicator (or points to empty string)
- };
- } // namespace pcrecpp
- #endif /* _PCRECPP_H */
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