src/Paragraph.h

   1 // -*- C++ -*-
   2 /**
   3  * \file Paragraph.h
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author Asger Alstrup
   8  * \author Lars Gullik Bjønnes
   9  * \author John Levon
  10  * \author André Pönitz
  11  * \author Jürgen Vigna
  12  *
  13  * Full author contact details are available in file CREDITS.
  14  */
  15
  16 #ifndef PARAGRAPH_H
  17 #define PARAGRAPH_H
  18
  19 #include "FontEnums.h"
  20 #include "Layout.h"
  21
  22 #include "insets/InsetCode.h"
  23
  24 #include "support/strfwd.h"
  25 #include "support/types.h"
  26
  27 namespace lyx {
  28
  29 class AuthorList;
  30 class Buffer;
  31 class BufferParams;
  32 class Change;
  33 class Counters;
  34 class Cursor;
  35 class CursorSlice;
  36 class DocumentClass;
  37 class Inset;
  38 class InsetBibitem;
  39 class LaTeXFeatures;
  40 class Inset_code;
  41 class InsetList;
  42 class Language;
  43 class Font;
  44 class Font_size;
  45 class MetricsInfo;
  46 class OutputParams;
  47 class PainterInfo;
  48 class ParagraphParameters;
  49 class TexRow;
  50
  51
  52 class FontSpan {
  53 public:
  54         /// Invalid font span containing no character
  55         FontSpan() : first(0), last(-1) {}
  56         /// Span including first and last
  57         FontSpan(pos_type f, pos_type l) : first(f), last(l) {}
  58
  59 public:
  60         /// Range including first and last.
  61         pos_type first, last;
  62 };
  63
  64 ///
  65 enum TextCase {
  66         ///
  67         text_lowercase = 0,
  68         ///
  69         text_capitalization = 1,
  70         ///
  71         text_uppercase = 2
  72 };
  73
  74
  75 /// A Paragraph holds all text, attributes and insets in a text paragraph
  76 class Paragraph
  77 {
  78 public:
  79         ///
  80         Paragraph();
  81         ///
  82         Paragraph(Paragraph const &);
  83         ///
  84         Paragraph & operator=(Paragraph const &);
  85         ///
  86         ~Paragraph();
  87         ///
  88         int id() const;
  89
  90         ///
  91         Language const * getParLanguage(BufferParams const &) const;
  92         ///
  93         bool isRTL(BufferParams const &) const;
  94         ///
  95         void changeLanguage(BufferParams const & bparams,
  96                             Language const * from, Language const * to);
  97         ///
  98         bool isMultiLingual(BufferParams const &) const;
  99
 100         /// Convert the paragraph to a string.
 101         /// Used for building the table of contents
 102         docstring asString(bool label) const;
 103         ///
 104         docstring asString(pos_type beg, pos_type end, bool label) const;
 105
 106         ///
 107         void write(std::ostream &, BufferParams const &,
 108                    depth_type & depth) const;
 109         ///
 110         void validate(LaTeXFeatures &) const;
 111
 112         ///
 113         bool latex(BufferParams const &, Font const & outerfont, odocstream &,
 114                 TexRow & texrow, OutputParams const &) const;
 115
 116         /// Can we drop the standard paragraph wrapper?
 117         bool emptyTag() const;
 118
 119         /// Get the id of the paragraph, usefull for docbook
 120         std::string getID(Buffer const & buf, OutputParams const & runparams) const;
 121
 122         /// Get the first word of a paragraph, return the position where it left
 123         pos_type firstWord(odocstream & os, OutputParams const & runparams) const;
 124
 125         /// Writes to stream the docbook representation
 126         void simpleDocBookOnePar(Buffer const & buf,
 127                                  odocstream &,
 128                                  OutputParams const & runparams,
 129                                  Font const & outerfont,
 130                                  pos_type initial = 0) const;
 131
 132         ///
 133         bool hasSameLayout(Paragraph const & par) const;
 134
 135         ///
 136         void makeSameLayout(Paragraph const & par);
 137
 138         ///
 139         void setInsetOwner(Inset * inset);
 140         ///
 141         Inset * inInset() const;
 142         ///
 143         InsetCode ownerCode() const;
 144         ///
 145         bool forceEmptyLayout() const;
 146         ///
 147         bool allowParagraphCustomization() const;
 148         ///
 149         bool useEmptyLayout() const;
 150         ///
 151         pos_type size() const;
 152         ///
 153         bool empty() const;
 154
 155         ///
 156         Layout const & layout() const;
 157         /// Do not pass a temporary to this!
 158         void setLayout(Layout const & layout);
 159         ///
 160         void setEmptyOrDefaultLayout(DocumentClass const & tc);
 161
 162         /// This is the item depth, only used by enumerate and itemize
 163         signed char itemdepth;
 164
 165         /// look up change at given pos
 166         Change const & lookupChange(pos_type pos) const;
 167
 168         /// is there a change within the given range ?
 169         bool isChanged(pos_type start, pos_type end) const;
 170         /// is there an unchanged char at the given pos ?
 171         bool isUnchanged(pos_type pos) const;
 172         /// is there an insertion at the given pos ?
 173         bool isInserted(pos_type pos) const;
 174         /// is there a deletion at the given pos ?
 175         bool isDeleted(pos_type pos) const;
 176
 177         /// will the paragraph be physically merged with the next
 178         /// one if the imaginary end-of-par character is logically deleted?
 179         bool isMergedOnEndOfParDeletion(bool trackChanges) const;
 180
 181         /// set change for the entire par
 182         void setChange(Change const & change);
 183
 184         /// set change at given pos
 185         void setChange(pos_type pos, Change const & change);
 186
 187         /// accept changes within the given range
 188         void acceptChanges(BufferParams const & bparams, pos_type start, pos_type end);
 189
 190         /// reject changes within the given range
 191         void rejectChanges(BufferParams const & bparams, pos_type start, pos_type end);
 192
 193         /// Paragraphs can contain "manual labels", for example, Description
 194         /// environment. The text for this user-editable label is stored in
 195         /// the paragraph alongside the text of the rest of the paragraph
 196         /// (the body). This function returns the starting position of the
 197         /// body of the text in the paragraph.
 198         pos_type beginOfBody() const;
 199         /// recompute this value
 200         void setBeginOfBody();
 201
 202         ///
 203         docstring const & labelString() const;
 204
 205         /// the next two functions are for the manual labels
 206         docstring const getLabelWidthString() const;
 207         /// Set label width string.
 208         void setLabelWidthString(docstring const & s);
 209         /// translate \p label to the paragraph language if possible.
 210         docstring const translateIfPossible(docstring const & label,
 211                 BufferParams const & bparams) const;
 212         /// Expand the counters for the labelstring of \c layout
 213         docstring expandLabel(Layout const &, BufferParams const &,
 214                 bool process_appendix = true) const;
 215         /// Actual paragraph alignment used
 216         char getAlign() const;
 217         /// The nesting depth of a paragraph
 218         depth_type getDepth() const;
 219         /// The maximal possible depth of a paragraph after this one
 220         depth_type getMaxDepthAfter() const;
 221         ///
 222         void applyLayout(Layout const & new_layout);
 223
 224         /// (logically) erase the char at pos; return true if it was actually erased
 225         bool eraseChar(pos_type pos, bool trackChanges);
 226         /// (logically) erase the given range; return the number of chars actually erased
 227         int eraseChars(pos_type start, pos_type end, bool trackChanges);
 228
 229         ///
 230         void resetFonts(Font const & font);
 231
 232         /** Get uninstantiated font setting. Returns the difference
 233             between the characters font and the layoutfont.
 234             This is what is stored in the fonttable
 235         */
 236         Font const
 237         getFontSettings(BufferParams const &, pos_type pos) const;
 238         ///
 239         Font const getFirstFontSettings(BufferParams const &) const;
 240
 241         /** Get fully instantiated font. If pos == -1, use the layout
 242             font attached to this paragraph.
 243             If pos == -2, use the label font of the layout attached here.
 244             In all cases, the font is instantiated, i.e. does not have any
 245             attributes with values FONT_INHERIT, FONT_IGNORE or
 246             FONT_TOGGLE.
 247         */
 248         Font const getFont(BufferParams const &, pos_type pos,
 249                               Font const & outerfont) const;
 250         Font const getLayoutFont(BufferParams const &,
 251                                     Font const & outerfont) const;
 252         Font const getLabelFont(BufferParams const &,
 253                                    Font const & outerfont) const;
 254         /**
 255          * The font returned by the above functions is the same in a
 256          * span of characters. This method will return the first and
 257          * the last positions in the paragraph for which that font is
 258          * the same. This can be used to avoid unnecessary calls to getFont.
 259          */
 260         FontSpan fontSpan(pos_type pos) const;
 261         ///
 262         char_type getChar(pos_type pos) const;
 263         /// Get the char, but mirror all bracket characters if it is right-to-left
 264         char_type getUChar(BufferParams const &, pos_type pos) const;
 265         /// pos <= size() (there is a dummy font change at the end of each par)
 266         void setFont(pos_type pos, Font const & font);
 267         /// Returns the height of the highest font in range
 268         FontSize highestFontInRange(pos_type startpos,
 269                                         pos_type endpos, FontSize def_size) const;
 270         ///
 271         void insert(pos_type pos, docstring const & str,
 272                     Font const & font, Change const & change);
 273
 274         ///
 275         void appendString(docstring const & s, Font const & font,
 276                 Change const & change);
 277         ///
 278         void appendChar(char_type c, Font const & font, Change const & change);
 279         ///
 280         void insertChar(pos_type pos, char_type c, bool trackChanges);
 281         ///
 282         void insertChar(pos_type pos, char_type c,
 283                         Font const &, bool trackChanges);
 284         ///
 285         void insertChar(pos_type pos, char_type c,
 286                         Font const &, Change const & change);
 287         ///
 288         void insertInset(pos_type pos, Inset * inset,
 289                          Change const & change);
 290         ///
 291         void insertInset(pos_type pos, Inset * inset,
 292                          Font const &, Change const & change);
 293         ///
 294         bool insetAllowed(InsetCode code);
 295         ///
 296         Inset * getInset(pos_type pos);
 297         ///
 298         Inset const * getInset(pos_type pos) const;
 299
 300         /// Release inset at given position.
 301         /// \warning does not honour change tracking!
 302         /// Therefore, it should only be used for breaking and merging
 303         /// paragraphs
 304         Inset * releaseInset(pos_type pos);
 305
 306         ///
 307         InsetList const & insetList() const;
 308
 309         ///
 310         bool isHfill(pos_type pos) const;
 311
 312         /// hinted by profiler
 313         bool isInset(pos_type pos) const;
 314         ///
 315         bool isNewline(pos_type pos) const;
 316         /// return true if the char is a word separator
 317         bool isSeparator(pos_type pos) const;
 318         ///
 319         bool isLineSeparator(pos_type pos) const;
 320         /// True if the character/inset at this point can be part of a word.
 321         /// Note that digits in particular are considered as letters
 322         bool isLetter(pos_type pos) const;
 323
 324         /// returns true if at least one line break or line separator has been deleted
 325         /// at the beginning of the paragraph (either physically or logically)
 326         bool stripLeadingSpaces(bool trackChanges);
 327
 328         /// return true if we allow multiple spaces
 329         bool isFreeSpacing() const;
 330
 331         /// return true if we allow this par to stay empty
 332         bool allowEmpty() const;
 333         ///
 334         char_type transformChar(char_type c, pos_type pos) const;
 335         ///
 336         ParagraphParameters & params();
 337         ///
 338         ParagraphParameters const & params() const;
 339
 340         /// Check if we are in a Biblio environment and insert or
 341         /// delete InsetBibitems as necessary.
 342         /// \retval int 1, if we had to add an inset, in which case
 343         /// the cursor will need to move cursor forward; -pos, if we deleted
 344         /// an inset, in which case pos is the position from which the inset
 345         /// was deleted, and the cursor will need to be moved back one if it
 346         /// was previously past that position. Return 0 otherwise.
 347         int checkBiblio(Buffer const & buffer);
 348
 349         /// For each author, set 'used' to true if there is a change
 350         /// by this author in the paragraph.
 351         void checkAuthors(AuthorList const & authorList);
 352
 353         ///
 354         void changeCase(BufferParams const & bparams, pos_type pos,
 355                 pos_type & right, TextCase action);
 356
 357         /// find \param str string inside Paragraph.
 358         /// \return true if the specified string is at the specified position
 359         /// \param del specifies whether deleted strings in ct mode will be considered
 360         bool find(
 361                 docstring const & str, ///< string to search
 362                 bool cs, ///<
 363                 bool mw, ///<
 364                 pos_type pos, ///< start from here.
 365                 bool del = true) const;
 366
 367         ///
 368         void updateWords(CursorSlice const & sl);
 369
 370 private:
 371         ///
 372         void deregisterWords();
 373         ///
 374         void collectWords(CursorSlice const & sl);
 375         ///
 376         void registerWords();
 377
 378         /// Pimpl away stuff
 379         class Private;
 380         ///
 381         friend class Paragraph::Private;
 382         ///
 383         Private * d;
 384 };
 385
 386 } // namespace lyx
 387
 388 #endif // PARAGRAPH_H