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355 lines
6.9 KiB
C++
355 lines
6.9 KiB
C++
#include <qpdf/PCRE.hh>
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#include <qpdf/QUtil.hh>
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#include <stdexcept>
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#include <iostream>
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#include <string.h>
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PCRE::NoBackref::NoBackref() :
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std::logic_error("PCRE error: no match")
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{
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}
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PCRE::Match::Match(int nbackrefs, char const* subject)
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{
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this->init(-1, nbackrefs, subject);
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}
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PCRE::Match::~Match()
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{
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this->destroy();
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}
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PCRE::Match::Match(Match const& rhs)
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{
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this->copy(rhs);
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}
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PCRE::Match&
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PCRE::Match::operator=(Match const& rhs)
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{
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if (this != &rhs)
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{
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this->destroy();
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this->copy(rhs);
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}
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return *this;
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}
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void
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PCRE::Match::init(int nmatches, int nbackrefs, char const* subject)
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{
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this->nmatches = nmatches;
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this->nbackrefs = nbackrefs;
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this->subject = subject;
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this->ovecsize = 3 * (1 + nbackrefs);
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this->ovector = 0;
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if (this->ovecsize)
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{
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this->ovector = new int[this->ovecsize];
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}
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}
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void
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PCRE::Match::copy(Match const& rhs)
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{
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this->init(rhs.nmatches, rhs.nbackrefs, rhs.subject);
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int i;
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for (i = 0; i < this->ovecsize; ++i)
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{
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this->ovector[i] = rhs.ovector[i];
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}
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}
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void
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PCRE::Match::destroy()
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{
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delete [] this->ovector;
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}
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PCRE::Match::operator bool()
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{
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return (this->nmatches >= 0);
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}
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std::string
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PCRE::Match::getMatch(int n, int flags)
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{
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// This method used to be implemented in terms of
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// pcre_get_substring, but that function gives you an empty string
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// for an unmatched backreference that is in range.
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int offset;
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int length;
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try
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{
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getOffsetLength(n, offset, length);
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}
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catch (NoBackref&)
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{
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if (flags & gm_no_substring_returns_empty)
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{
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return "";
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}
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else
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{
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throw;
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}
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}
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return std::string(this->subject).substr(offset, length);
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}
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void
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PCRE::Match::getOffsetLength(int n, int& offset, int& length)
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{
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if ((this->nmatches < 0) ||
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(n > this->nmatches - 1) ||
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(this->ovector[n * 2] == -1))
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{
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throw NoBackref();
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}
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offset = this->ovector[n * 2];
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length = this->ovector[n * 2 + 1] - offset;
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}
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int
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PCRE::Match::getOffset(int n)
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{
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int offset;
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int length;
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this->getOffsetLength(n, offset, length);
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return offset;
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}
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int
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PCRE::Match::getLength(int n)
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{
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int offset;
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int length;
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this->getOffsetLength(n, offset, length);
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return length;
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}
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int
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PCRE::Match::nMatches() const
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{
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return this->nmatches;
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}
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PCRE::PCRE(char const* pattern, int options)
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{
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char const *errptr;
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int erroffset;
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this->code = pcre_compile(pattern, options, &errptr, &erroffset, 0);
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if (this->code)
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{
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this->nbackrefs = pcre_info(this->code, 0, 0);
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}
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else
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{
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std::string message = (std::string("compilation of ") + pattern +
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" failed at offset " +
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QUtil::int_to_string(erroffset) + ": " +
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errptr);
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throw std::runtime_error("PCRE error: " + message);
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}
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}
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PCRE::~PCRE()
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{
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pcre_free(this->code);
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}
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PCRE::Match
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PCRE::match(char const* subject, int options, int startoffset, int size)
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{
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if (size == -1)
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{
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size = strlen(subject);
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}
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Match result(this->nbackrefs, subject);
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int status = pcre_exec(this->code, 0, subject, size,
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startoffset, options,
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result.ovector, result.ovecsize);
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if (status >= 0)
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{
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result.nmatches = status;
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}
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else
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{
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std::string message;
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switch (status)
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{
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case PCRE_ERROR_NOMATCH:
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break;
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case PCRE_ERROR_BADOPTION:
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message = "bad option passed to PCRE::match()";
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throw std::logic_error(message);
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break;
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case PCRE_ERROR_NOMEMORY:
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message = "insufficient memory";
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throw std::runtime_error(message);
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break;
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case PCRE_ERROR_NULL:
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case PCRE_ERROR_BADMAGIC:
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case PCRE_ERROR_UNKNOWN_NODE:
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default:
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message = "pcre_exec returned " + QUtil::int_to_string(status);
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throw std::logic_error(message);
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}
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}
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return result;
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}
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void
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PCRE::test(int n)
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{
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try
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{
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if (n == 1)
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{
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static char const* utf8 = "abπdefq";
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PCRE u1("^([[:alpha:]]+)");
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PCRE u2("^([\\p{L}]+)", PCRE_UTF8);
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PCRE::Match m1 = u1.match(utf8);
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if (m1)
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{
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std::cout << "no utf8: " << m1.getMatch(1) << std::endl;
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}
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PCRE::Match m2 = u2.match(utf8);
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if (m2)
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{
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std::cout << "utf8: " << m2.getMatch(1) << std::endl;
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}
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return;
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}
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try
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{
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PCRE pcre1("a**");
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}
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catch (std::exception& e)
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{
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std::cout << e.what() << std::endl;
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}
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PCRE pcre2("^([^\\s:]*)\\s*:\\s*(.*?)\\s*$");
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PCRE::Match m2 = pcre2.match("key: value one two three ");
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if (m2)
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{
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std::cout << m2.nMatches() << std::endl;
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std::cout << m2.getMatch(0) << std::endl;
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std::cout << m2.getOffset(0) << std::endl;
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std::cout << m2.getLength(0) << std::endl;
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std::cout << m2.getMatch(1) << std::endl;
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std::cout << m2.getOffset(1) << std::endl;
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std::cout << m2.getLength(1) << std::endl;
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std::cout << m2.getMatch(2) << std::endl;
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std::cout << m2.getOffset(2) << std::endl;
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std::cout << m2.getLength(2) << std::endl;
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try
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{
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std::cout << m2.getMatch(3) << std::endl;
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}
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catch (std::exception& e)
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{
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std::cout << e.what() << std::endl;
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}
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try
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{
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std::cout << m2.getOffset(3) << std::endl;
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}
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catch (std::exception& e)
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{
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std::cout << e.what() << std::endl;
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}
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}
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PCRE pcre3("^(a+)(b+)?$");
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PCRE::Match m3 = pcre3.match("aaa");
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try
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{
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if (m3)
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{
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std::cout << m3.nMatches() << std::endl;
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std::cout << m3.getMatch(0) << std::endl;
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std::cout << m3.getMatch(1) << std::endl;
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std::cout << "-"
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<< m3.getMatch(
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2, Match::gm_no_substring_returns_empty)
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<< "-" << std::endl;
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std::cout << "hello" << std::endl;
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std::cout << m3.getMatch(2) << std::endl;
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std::cout << "can't see this" << std::endl;
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}
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}
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catch (std::exception& e)
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{
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std::cout << e.what() << std::endl;
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}
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// backref: 1 2 3 4 5
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PCRE pcre4("^((?:(a(b)?)(?:,(c))?)|(c))?$");
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static char const* candidates[] = {
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"qqqcqqq", // no match
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"ab,c", // backrefs: 0, 1, 2, 3, 4
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"ab", // backrefs: 0, 1, 2, 3
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"a", // backrefs: 0, 1, 2
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"a,c", // backrefs: 0, 1, 2, 4
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"c", // backrefs: 0, 1, 5
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"", // backrefs: 0
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0
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};
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for (char const** p = candidates; *p; ++p)
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{
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PCRE::Match m(pcre4.match(*p));
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if (m)
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{
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int nmatches = m.nMatches();
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for (int i = 0; i < nmatches; ++i)
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{
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std::cout << *p << ": " << i << ": ";
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try
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{
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std::string match = m.getMatch(i);
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std::cout << match;
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}
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catch (NoBackref&)
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{
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std::cout << "no backref (getMatch)";
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}
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std::cout << std::endl;
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std::cout << *p << ": " << i << ": ";
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try
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{
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int offset;
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int length;
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m.getOffsetLength(i, offset, length);
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std::cout << offset << ", " << length;
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}
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catch (NoBackref&)
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{
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std::cout << "no backref (getOffsetLength)";
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}
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std:: cout << std::endl;
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}
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}
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else
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{
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std::cout << *p << ": no match" << std::endl;
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}
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}
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}
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catch (std::exception& e)
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{
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std::cout << "unexpected exception: " << e.what() << std::endl;
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}
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}
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