src/Changes.h

   1 // -*- C++ -*-
   2 /**
   3  * \file Changes.h
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author John Levon
   8  * \author Michael Gerz
   9  *
  10  * Full author contact details are available in file CREDITS.
  11  *
  12  * Record changes in a paragraph.
  13  */
  14
  15 #ifndef CHANGES_H
  16 #define CHANGES_H
  17
  18 #include "Color.h"
  19
  20 #include "support/docstream.h"
  21 #include "support/strfwd.h"
  22 #include "support/types.h"
  23 #include "support/lyxtime.h"
  24
  25 #include <vector>
  26
  27
  28 namespace lyx {
  29
  30 class AuthorList;
  31 class Buffer;
  32 class DocIterator;
  33 class OutputParams;
  34
  35 class Change {
  36 public:
  37         /// the type of change
  38         enum Type {
  39                 UNCHANGED, // no change
  40                 INSERTED, // new text
  41                 DELETED // deleted text
  42         };
  43
  44         explicit Change(Type t = UNCHANGED, int a = 0, time_t ct = current_time())
  45                 : type(t), author(a), changetime(ct) {}
  46
  47         /// is the change similar to the given change such that both can be merged?
  48         bool isSimilarTo(Change const & change) const;
  49         /// The color of this change on screen
  50         Color color() const;
  51         ///
  52         bool changed() const { return type != UNCHANGED; }
  53         ///
  54         void setUnchanged() { type = UNCHANGED; }
  55         ///
  56         bool inserted() const { return type == INSERTED; }
  57         ///
  58         void setInserted() { type = INSERTED; }
  59         ///
  60         bool deleted() const { return type == DELETED; }
  61         ///
  62         void setDeleted() { type = DELETED; }
  63         /// Is this change made by the current author ?
  64         bool currentAuthor() const { return author == 0; }
  65
  66         Type type;
  67
  68         int author;
  69
  70         time_t changetime;
  71 };
  72
  73 bool operator==(Change const & l, Change const & r);
  74 bool operator!=(Change const & l, Change const & r);
  75
  76 class BufferParams;
  77
  78 class Changes {
  79 public:
  80         /// set the pos to the given change
  81         void set(Change const & change, pos_type pos);
  82         /// set the range (excluding end) to the given change
  83         void set(Change const & change, pos_type start, pos_type end);
  84
  85         /// erase the entry at pos and adjust all range bounds past it
  86         /// (assumes that a character was deleted at pos)
  87         void erase(lyx::pos_type pos);
  88
  89         /// insert a new entry at pos and adjust all range bounds past it
  90         /// (assumes that a character was inserted at pos)
  91         void insert(Change const & change, lyx::pos_type pos);
  92
  93         ///
  94
  95         /// return the change at the given pos
  96         Change const & lookup(pos_type pos) const;
  97
  98         /// return true if there is a change in the given range (excluding end)
  99         bool isChanged(pos_type start, pos_type end) const;
 100
 101         /// return true if the whole range is deleted
 102         bool isDeleted(pos_type start, pos_type end) const;
 103
 104         /// output latex to mark a transition between two change types
 105         /// returns length of text outputted
 106         static int latexMarkChange(odocstream & os, BufferParams const & bparams,
 107                                    Change const & oldChange, Change const & change,
 108                                    OutputParams const & runparams);
 109
 110         /// output .lyx file format for transitions between changes
 111         static void lyxMarkChange(std::ostream & os, BufferParams const & bparams,
 112                 int & column, Change const & old, Change const & change);
 113
 114         ///
 115         void checkAuthors(AuthorList const & authorList);
 116
 117         ///
 118         void addToToc(DocIterator const & cdit, Buffer const & buffer) const;
 119
 120 private:
 121         class Range {
 122         public:
 123                 Range(pos_type s, pos_type e)
 124                         : start(s), end(e) {}
 125
 126                 // does this range contain r ? (inlined as the result of profiling)
 127                 bool contains(Range const & r) const {
 128                         return r.start >= start && r.end <= end;
 129                 }
 130
 131                 // does this range contain pos ? (inlined as the result of profiling)
 132                 bool contains(pos_type pos) const {
 133                         return pos >= start && pos < end;
 134                 }
 135
 136                 // do the ranges intersect ?
 137                 bool intersects(Range const & r) const;
 138
 139                 pos_type start;
 140                 pos_type end; // Caution: end is not in the range!
 141         };
 142
 143         friend bool operator==(Range const & r1, Range const & r2);
 144         friend bool operator!=(Range const & r1, Range const & r2);
 145
 146         class ChangeRange {
 147         public:
 148                 ChangeRange(Change const & c, Range const & r)
 149                         : change(c), range(r) {}
 150
 151                 Change change;
 152                 Range range;
 153         };
 154
 155         /// merge equal changes with adjoining ranges
 156         void merge();
 157
 158         typedef std::vector<ChangeRange> ChangeTable;
 159
 160         /// table of changes, every row a change and range descriptor
 161         ChangeTable table_;
 162 };
 163
 164
 165 } // namespace lyx
 166
 167 #endif // CHANGES_H