X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2FCompare.cpp;h=68570b85b5fcee49befc572ec5accf9b3e7bd109;hb=355395174bf50e1a3b8514e8eebec978c496d6ba;hp=37989a8986ca7760aafe2d053618bdeec247d2e3;hpb=93510f741c5dad1202162ce8b05f48b5e0e849aa;p=lyx.git diff --git a/src/Compare.cpp b/src/Compare.cpp index 37989a8986..68570b85b5 100644 --- a/src/Compare.cpp +++ b/src/Compare.cpp @@ -12,16 +12,16 @@ #include "Compare.h" +#include "Author.h" #include "BufferParams.h" #include "Changes.h" +#include "Font.h" #include "insets/InsetText.h" -#include "support/lassert.h" - -#include - -#include +#include "support/lassert.h" +#include "support/lyxalgo.h" +#include "support/qstring_helpers.h" using namespace std; using namespace lyx::support; @@ -57,14 +57,14 @@ static void step(DocIterator & dit, DocIterator const & end, Direction direction */ class DocRange { public: - DocRange(DocIterator from_, DocIterator to_) + DocRange(DocIterator const & from_, DocIterator const & to_) : from(from_), to(to_) {} - DocRange(Buffer const * buf) + DocRange(Buffer const * buf) : + from(doc_iterator_begin(buf)), + to(doc_iterator_end(buf)) { - from = doc_iterator_begin(buf); - to = doc_iterator_end(buf); to.backwardPos(); } @@ -84,46 +84,32 @@ public: size_t DocRange::length() const { - pit_type startpit = from.pit(); - pit_type endpit = to.pit(); - ParagraphList const & ps_ = from.text()->paragraphs(); - - ParagraphList pars(boost::next(ps_.begin(), startpit), - boost::next(ps_.begin(), endpit + 1)); - - // Remove the end of the last paragraph; afterwards, remove the - // beginning of the first paragraph. - Paragraph & back = pars.back(); - back.eraseChars(to.pos(), back.size(), false); - Paragraph & front = pars.front(); - front.eraseChars(0, from.pos(), false); - - ParagraphList::const_iterator pit = pars.begin(); - ParagraphList::const_iterator end_it = pars.end(); - + ParagraphList const & ps = from.text()->paragraphs(); size_t length = 0; - for (; pit != end_it; ++pit) - length += pit->size() + 1; - - // The last paragraph has no paragraph-end - --length; - return length; + pit_type pit = from.pit(); + pit_type const endpit = to.pit(); + for (; pit < endpit; ++pit) + length += ps[pit].size() + 1; + length += to.pos() - from.pos(); + return length; } class DocPair { public: - DocPair() {} + DocPair() + {} DocPair(DocIterator o_, DocIterator n_) : o(o_), n(n_) {} - bool operator!=(DocPair const & rhs) { + bool operator!=(DocPair const & rhs) + { // this might not be intuitive but correct for our purpose return o != rhs.o && n != rhs.n; } - + DocPair & operator++() { @@ -143,17 +129,17 @@ public: /// DocIterator n; }; - + /** * A pair of two DocRanges. */ class DocRangePair { public: - DocRangePair(DocRange o_, DocRange n_) + DocRangePair(DocRange const & o_, DocRange const & n_) : o(o_), n(n_) {} - - DocRangePair(DocPair from, DocPair to) + + DocRangePair(DocPair const & from, DocPair const & to) : o(from.o, to.o), n(from.n, to.n) {} @@ -162,10 +148,16 @@ public: {} /// Returns the from pair - DocPair from() const { return DocPair(o.from, n.from); } + DocPair from() const + { + return DocPair(o.from, n.from); + } /// Returns the to pair - DocPair to() const { return DocPair(o.to, n.to); } + DocPair to() const + { + return DocPair(o.to, n.to); + } DocRange o; DocRange n; @@ -197,7 +189,8 @@ static DocRangePair stepIntoInset(DocPair const & inset_location) template class compl_vector { public: - compl_vector() {} + compl_vector() + {} void reset(T const & def) { @@ -206,13 +199,14 @@ public: Vn_.clear(); } + /// Gets the value at index. If it is not in the vector + /// the default value is inserted and returned. T & operator[](int index) { vector & V = index >= 0 ? Vp_ : Vn_; - if (index < 0) - index = -index-1; - while (index >= V.size()) + unsigned int const ii = index >= 0 ? index : -index - 1; + while (ii >= V.size()) V.push_back(default_); - return V[index]; + return V[ii]; } private: @@ -233,14 +227,18 @@ private: class Compare::Impl { public: /// - Impl(Compare const & compare) - : abort_(false), compare_(compare) + Impl(Compare const & compare) + : abort_(false), n_(0), m_(0), offset_reverse_diagonal_(0), + odd_offset_(0), compare_(compare), + old_buf_(0), new_buf_(0), dest_buf_(0), dest_pars_(0), + recursion_level_(0), nested_inset_level_(0), D_(0) {} /// - ~Impl() {} + ~Impl() + {} - // Algorithm to find the shortest edit string. This algorithm + // Algorithm to find the shortest edit string. This algorithm // only needs a linear amount of memory (linear with the sum // of the number of characters in the two paragraph-lists). bool diff(Buffer const * new_buf, Buffer const * old_buf, @@ -249,10 +247,19 @@ public: /// Set to true to cancel the algorithm bool abort_; + /// + QString status() + { + QString status; + status += toqstr("recursion level:") + " " + QString::number(recursion_level_) + + " " + toqstr("differences:") + " " + QString::number(D_); + return status; + } + private: /// Finds the middle snake and returns the length of the /// shortest edit script. - int find_middle_snake(DocRangePair const & rp, DocPair & middle_snake); + int findMiddleSnake(DocRangePair const & rp, DocPair & middle_snake); enum SnakeResult { NoSnake, @@ -262,46 +269,46 @@ private: /// Retrieve the middle snake when there is overlap between /// the forward and backward path. - SnakeResult retrieve_middle_snake(int k, int D, Direction direction, + SnakeResult retrieveMiddleSnake(int k, int D, Direction direction, DocPair & middle_snake); - - /// Find the the furthest reaching D-path (number of horizontal + + /// Find the furthest reaching D-path (number of horizontal /// and vertical steps; differences between the old and new /// document) in the k-diagonal (vertical minus horizontal steps). - void furthest_Dpath_kdiagonal(int D, int k, + void furthestDpathKdiagonal(int D, int k, DocRangePair const & rp, Direction direction); /// Is there overlap between the forward and backward path bool overlap(int k, int D); - + /// This function is called recursively by a divide and conquer /// algorithm. Each time, the string is divided into two split /// around the middle snake. void diff_i(DocRangePair const & rp); - /// Processes the splitted chunks. It either adds them as deleted, + /// Processes the split chunks. It either adds them as deleted, /// as added, or call diff_i for further processing. - void diff_part(DocRangePair const & rp); + void diffPart(DocRangePair const & rp); - /// Runs the algorithm for the inset located at /c it and /c it_n + /// Runs the algorithm for the inset located at /c it and /c it_n /// and adds the result to /c pars. - void diff_inset(Inset * inset, DocPair const & p); + void diffInset(Inset * inset, DocPair const & p); /// Adds the snake to the destination buffer. The algorithm will /// recursively be applied to any InsetTexts that are within the snake. - void process_snake(DocRangePair const & rp); + void processSnake(DocRangePair const & rp); /// Writes the range to the destination buffer void writeToDestBuffer(DocRange const & range, Change::Type type = Change::UNCHANGED); - + /// Writes the paragraph list to the destination buffer void writeToDestBuffer(ParagraphList const & copy_pars) const; /// The length of the old chunk currently processed - int N_; + int n_; /// The length of the new chunk currently processed - int M_; + int m_; /// The offset diagonal of the reverse path of the /// currently processed chunk int offset_reverse_diagonal_; @@ -337,6 +344,10 @@ private: compl_vector nrp; compl_vector ors; compl_vector nrs; + + /// The number of differences in the path the algorithm + /// is currently processing. + int D_; }; ///////////////////////////////////////////////////////////////////// @@ -350,6 +361,15 @@ Compare::Compare(Buffer const * new_buf, Buffer const * old_buf, : new_buffer(new_buf), old_buffer(old_buf), dest_buffer(dest_buf), options_(options), pimpl_(new Impl(*this)) { + connect(&status_timer_, SIGNAL(timeout()), + this, SLOT(doStatusMessage())); + status_timer_.start(1000); +} + + +void Compare::doStatusMessage() +{ + statusMessage(pimpl_->status()); } @@ -358,14 +378,23 @@ void Compare::run() if (!dest_buffer || !new_buffer || !old_buffer) return; - // Copy the buffer params to the new buffer + // Copy the buffer params to the destination buffer dest_buffer->params() = options_.settings_from_new ? new_buffer->params() : old_buffer->params(); - + + // Copy extra authors to the destination buffer + AuthorList const & extra_authors = options_.settings_from_new ? + old_buffer->params().authors() : new_buffer->params().authors(); + AuthorList::Authors::const_iterator it = extra_authors.begin(); + for (; it != extra_authors.end(); ++it) + dest_buffer->params().authors().record(*it); + + doStatusMessage(); + // do the real work if (!doCompare()) return; - + finished(pimpl_->abort_); return; } @@ -386,15 +415,15 @@ void Compare::abort() } -static void get_paragraph_list(DocRange const & range, +static void getParagraphList(DocRange const & range, ParagraphList & pars) { // Clone the paragraphs within the selection. pit_type startpit = range.from.pit(); pit_type endpit = range.to.pit(); ParagraphList const & ps_ = range.text()->paragraphs(); - ParagraphList tmp_pars(boost::next(ps_.begin(), startpit), - boost::next(ps_.begin(), endpit + 1)); + ParagraphList tmp_pars(lyx::next(ps_.begin(), startpit), + lyx::next(ps_.begin(), endpit + 1)); // Remove the end of the last paragraph; afterwards, remove the // beginning of the first paragraph. Keep this order - there may only @@ -417,7 +446,7 @@ static bool equal(Inset const * i_o, Inset const * i_n) if (i_o->lyxCode() != i_n->lyxCode()) return false; - // Editable insets are assumed to be the same as they are of the + // Editable insets are assumed to be the same as they are of the // same type. If we later on decide that we insert them in the // document as being unchanged, we will run the algorithm on the // contents of the two insets. @@ -436,7 +465,15 @@ static bool equal(Inset const * i_o, Inset const * i_n) } -static bool equal(DocIterator & o, DocIterator & n) { +static bool equal(DocIterator & o, DocIterator & n) +{ + // Explicitly check for this, so we won't call + // Paragraph::getChar for the last pos. + bool const o_lastpos = o.pos() == o.lastpos(); + bool const n_lastpos = n.pos() == n.lastpos(); + if (o_lastpos || n_lastpos) + return o_lastpos && n_lastpos; + Paragraph const & old_par = o.text()->getPar(o.pit()); Paragraph const & new_par = n.text()->getPar(n.pit()); @@ -451,7 +488,7 @@ static bool equal(DocIterator & o, DocIterator & n) { if (i_o && i_n) return equal(i_o, i_n); - } + } Font fo = old_par.getFontSettings(o.buffer()->params(), o.pos()); Font fn = new_par.getFontSettings(n.buffer()->params(), n.pos()); @@ -459,15 +496,15 @@ static bool equal(DocIterator & o, DocIterator & n) { } -/// Traverses a snake in a certain direction. p points to a +/// Traverses a snake in a certain direction. p points to a /// position in the old and new file and they are synchronously /// moved along the snake. The function returns true if a snake /// was found. -static bool traverse_snake(DocPair & p, DocRangePair const & range, +static bool traverseSnake(DocPair & p, DocRangePair const & range, Direction direction) { bool ret = false; - DocPair const & p_end = + DocPair const & p_end = direction == Forward ? range.to() : range.from(); while (p != p_end) { @@ -493,7 +530,7 @@ static bool traverse_snake(DocPair & p, DocRangePair const & range, ///////////////////////////////////////////////////////////////////// -void Compare::Impl::furthest_Dpath_kdiagonal(int D, int k, +void Compare::Impl::furthestDpathKdiagonal(int D, int k, DocRangePair const & rp, Direction direction) { compl_vector & op = direction == Forward ? ofp : orp; @@ -511,6 +548,7 @@ void Compare::Impl::furthest_Dpath_kdiagonal(int D, int k, // Where do we take the step from ? int const kk = vertical_step ? k + 1 : k - 1; DocPair p(op[kk], np[kk]); + DocPair const s(os[kk], ns[kk]); // If D==0 we simulate a vertical step from (0,-1) by doing nothing. if (D != 0) { @@ -523,17 +561,17 @@ void Compare::Impl::furthest_Dpath_kdiagonal(int D, int k, step(p.o, rp.o.to, direction); else if (!vertical_step && direction == Backward) step(p.o, rp.o.from, direction); - } - + } + // Traverse snake - if (traverse_snake(p, rp, direction)) { + if (traverseSnake(p, rp, direction)) { // Record last snake os[k] = p.o; ns[k] = p.n; } else { // Copy last snake from the previous step - os[k] = os[kk]; - ns[k] = ns[kk]; + os[k] = s.o; + ns[k] = s.n; } //Record new position @@ -559,7 +597,7 @@ bool Compare::Impl::overlap(int k, int D) } -Compare::Impl::SnakeResult Compare::Impl::retrieve_middle_snake( +Compare::Impl::SnakeResult Compare::Impl::retrieveMiddleSnake( int k, int D, Direction direction, DocPair & middle_snake) { compl_vector & os = direction == Forward ? ofs : ors; @@ -574,10 +612,10 @@ Compare::Impl::SnakeResult Compare::Impl::retrieve_middle_snake( if (os[k].empty() && os_r[kk].empty()) { // No, there is no snake at all, in which case // the length of the shortest edit script is M+N. - LASSERT(2 * D - odd_offset_ == M_ + N_, /**/); + LATTEST(2 * D - odd_offset_ == m_ + n_); return NoSnake; - } - + } + if (os[k].empty()) { // Yes, but there is only 1 snake and we found it in the // reverse path. @@ -592,16 +630,16 @@ Compare::Impl::SnakeResult Compare::Impl::retrieve_middle_snake( } -int Compare::Impl::find_middle_snake(DocRangePair const & rp, +int Compare::Impl::findMiddleSnake(DocRangePair const & rp, DocPair & middle_snake) { // The lengths of the old and new chunks. - N_ = rp.o.length(); - M_ = rp.n.length(); + n_ = rp.o.length(); + m_ = rp.n.length(); // Forward paths are centered around the 0-diagonal; reverse paths // are centered around the diagonal N - M. (Delta in the article) - offset_reverse_diagonal_ = N_ - M_; + offset_reverse_diagonal_ = n_ - m_; // If the offset is odd, only check for overlap while extending forward // paths, otherwise only check while extending reverse paths. @@ -616,19 +654,22 @@ int Compare::Impl::find_middle_snake(DocRangePair const & rp, ors.reset(DocIterator()); nrs.reset(DocIterator()); + // In the formula below, the "+ 1" ensures we round like ceil() + int const D_max = (m_ + n_ + 1)/2; // D is the number of horizontal and vertical steps, i.e. // different characters in the old and new chunk. - int const D_max = ceil(((double)M_ + N_)/2); for (int D = 0; D <= D_max; ++D) { + // to be used in the status messages + D_ = D; // Forward and reverse paths for (int f = 0; f < 2; ++f) { Direction direction = f == 0 ? Forward : Backward; // Diagonals between -D and D can be reached by a D-path - for (int k = -D; k <= D; k += 2) { + for (int k = -D; k <= D; k += 2) { // Find the furthest reaching D-path on this diagonal - furthest_Dpath_kdiagonal(D, k, rp, direction); + furthestDpathKdiagonal(D, k, rp, direction); // Only check for overlap for forward paths if the offset is odd // and only for reverse paths if the offset is even. @@ -636,10 +677,12 @@ int Compare::Impl::find_middle_snake(DocRangePair const & rp, // Do the forward and backward paths overlap ? if (overlap(k, D - odd_offset_)) { - retrieve_middle_snake(k, D, direction, middle_snake); + retrieveMiddleSnake(k, D, direction, middle_snake); return 2 * D - odd_offset_; } } + if (abort_) + return 0; } } } @@ -666,12 +709,14 @@ bool Compare::Impl::diff(Buffer const * new_buf, Buffer const * old_buf, DocRangePair rp(old_buf_, new_buf_); DocPair from = rp.from(); - traverse_snake(from, rp, Forward); + traverseSnake(from, rp, Forward); DocRangePair const snake(rp.from(), from); - process_snake(snake); - + processSnake(snake); + // Start the recursive algorithm - diff_i(rp); + DocRangePair rp_new(from, rp.to()); + if (!rp_new.o.empty() || !rp_new.n.empty()) + diff_i(rp_new); for (pit_type p = 0; p < (pit_type)dest_pars_->size(); ++p) { (*dest_pars_)[p].setBuffer(const_cast(*dest_buf)); @@ -684,12 +729,15 @@ bool Compare::Impl::diff(Buffer const * new_buf, Buffer const * old_buf, void Compare::Impl::diff_i(DocRangePair const & rp) { + if (abort_) + return; + // The middle snake DocPair middle_snake; // Divides the problem into two smaller problems, split around // the snake in the middle. - int const L_ses = find_middle_snake(rp, middle_snake); + int const L_ses = findMiddleSnake(rp, middle_snake); // Set maximum of progress bar if (++recursion_level_ == 1) @@ -711,35 +759,35 @@ void Compare::Impl::diff_i(DocRangePair const & rp) } else { // Retrieve the complete snake DocPair first_part_end = middle_snake; - traverse_snake(first_part_end, rp, Backward); + traverseSnake(first_part_end, rp, Backward); DocRangePair first_part(rp.from(), first_part_end); - + DocPair second_part_begin = middle_snake; - traverse_snake(second_part_begin, rp, Forward); + traverseSnake(second_part_begin, rp, Forward); DocRangePair second_part(second_part_begin, rp.to()); - + // Split the string in three parts: // 1. in front of the snake - diff_part(first_part); + diffPart(first_part); // 2. the snake itself, and DocRangePair const snake(first_part.to(), second_part.from()); - process_snake(snake); + processSnake(snake); // 3. behind the snake. - diff_part(second_part); + diffPart(second_part); } --recursion_level_; } -void Compare::Impl::diff_part(DocRangePair const & rp) +void Compare::Impl::diffPart(DocRangePair const & rp) { // Is there a finite length string in both buffers, if not there // is an empty string and we write the other one to the buffer. if (!rp.o.empty() && !rp.n.empty()) diff_i(rp); - + else if (!rp.o.empty()) writeToDestBuffer(rp.o, Change::DELETED); @@ -748,7 +796,7 @@ void Compare::Impl::diff_part(DocRangePair const & rp) } -void Compare::Impl::diff_inset(Inset * inset, DocPair const & p) +void Compare::Impl::diffInset(Inset * inset, DocPair const & p) { // Find the dociterators for the beginning and the // end of the inset, for the old and new document. @@ -759,7 +807,7 @@ void Compare::Impl::diff_inset(Inset * inset, DocPair const & p) ParagraphList * backup_dest_pars = dest_pars_; dest_pars_ = &inset->asInsetText()->text().paragraphs(); dest_pars_->clear(); - + ++nested_inset_level_; diff_i(rp); --nested_inset_level_; @@ -768,10 +816,10 @@ void Compare::Impl::diff_inset(Inset * inset, DocPair const & p) } -void Compare::Impl::process_snake(DocRangePair const & rp) +void Compare::Impl::processSnake(DocRangePair const & rp) { ParagraphList pars; - get_paragraph_list(rp.o, pars); + getParagraphList(rp.o, pars); // Find insets in this paragaph list DocPair it = rp.from(); @@ -784,8 +832,8 @@ void Compare::Impl::process_snake(DocRangePair const & rp) pit_type const pit = it.o.pit() - rp.o.from.pit(); pos_type const pos = pit ? it.o.pos() : it.o.pos() - rp.o.from.pos(); inset = pars[pit].getInset(pos); - LASSERT(inset, /**/); - diff_inset(inset, it); + LASSERT(inset, continue); + diffInset(inset, it); } } writeToDestBuffer(pars); @@ -796,7 +844,7 @@ void Compare::Impl::writeToDestBuffer(DocRange const & range, Change::Type type) { ParagraphList pars; - get_paragraph_list(range, pars); + getParagraphList(range, pars); pos_type size = 0;