src/mathed/MathStream.h

   1 // -*- C++ -*-
   2 /**
   3  * \file MathStream.h
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author André Pönitz
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #ifndef MATH_MATHMLSTREAM_H
  13 #define MATH_MATHMLSTREAM_H
  14
  15 #include "support/strfwd.h"
  16
  17 #include "InsetMath.h"
  18 // FIXME: Move to individual insets
  19 #include "MetricsInfo.h"
  20
  21
  22 namespace lyx {
  23
  24 class Encoding;
  25 class InsetMath;
  26 class MathAtom;
  27 class MathData;
  28
  29 //
  30 // LaTeX/LyX
  31 //
  32
  33 class WriteStream {
  34 public:
  35         ///
  36         enum OutputType {
  37                 wsDefault,
  38                 wsDryrun,
  39                 wsPreview
  40         };
  41         ///
  42         WriteStream(odocstream & os, bool fragile, bool latex, OutputType output,
  43                 Encoding const * encoding = 0);
  44         ///
  45         explicit WriteStream(odocstream & os);
  46         ///
  47         ~WriteStream();
  48         ///
  49         int line() const { return line_; }
  50         ///
  51         bool fragile() const { return fragile_; }
  52         ///
  53         bool latex() const { return latex_; }
  54         ///
  55         OutputType output() const { return output_; }
  56         ///
  57         odocstream & os() { return os_; }
  58         ///
  59         bool & firstitem() { return firstitem_; }
  60         ///
  61         void addlines(unsigned int);
  62         /// writes space if next thing is isalpha()
  63         void pendingSpace(bool how);
  64         /// writes space if next thing is isalpha()
  65         bool pendingSpace() const { return pendingspace_; }
  66         /// tell whether to write the closing brace of \ensuremath
  67         void pendingBrace(bool brace);
  68         /// tell whether to write the closing brace of \ensuremath
  69         bool pendingBrace() const { return pendingbrace_; }
  70         /// tell whether we are in text mode or not when producing latex code
  71         void textMode(bool textmode);
  72         /// tell whether we are in text mode or not when producing latex code
  73         bool textMode() const { return textmode_; }
  74         /// tell whether we are allowed to switch mode when producing latex code
  75         void lockedMode(bool locked);
  76         /// tell whether we are allowed to switch mode when producing latex code
  77         bool lockedMode() const { return locked_; }
  78         /// LaTeX encoding
  79         Encoding const * encoding() const { return encoding_; }
  80 private:
  81         ///
  82         odocstream & os_;
  83         /// do we have to write \\protect sometimes
  84         bool fragile_;
  85         /// are we at the beginning of an MathData?
  86         bool firstitem_;
  87         /// are we writing to .tex?
  88         int latex_;
  89         /// output type (default, source preview, instant preview)?
  90         OutputType output_;
  91         /// do we have a space pending?
  92         bool pendingspace_;
  93         /// do we have a brace pending?
  94         bool pendingbrace_;
  95         /// are we in text mode when producing latex code?
  96         bool textmode_;
  97         /// are we allowed to switch mode when producing latex code?
  98         bool locked_;
  99         ///
 100         int line_;
 101         ///
 102         Encoding const * encoding_;
 103 };
 104
 105 ///
 106 WriteStream & operator<<(WriteStream &, MathAtom const &);
 107 ///
 108 WriteStream & operator<<(WriteStream &, MathData const &);
 109 ///
 110 WriteStream & operator<<(WriteStream &, docstring const &);
 111 ///
 112 WriteStream & operator<<(WriteStream &, char const * const);
 113 ///
 114 WriteStream & operator<<(WriteStream &, char);
 115 ///
 116 WriteStream & operator<<(WriteStream &, int);
 117 ///
 118 WriteStream & operator<<(WriteStream &, unsigned int);
 119
 120 /// ensure math mode, possibly by opening \ensuremath
 121 bool ensureMath(WriteStream & os, bool needs_math_mode = true, bool macro = false);
 122
 123 /// ensure the requested mode, possibly by closing \ensuremath
 124 int ensureMode(WriteStream & os, InsetMath::mode_type mode, bool locked);
 125
 126
 127 /**
 128  * MathEnsurer - utility class for ensuring math mode
 129  *
 130  * A local variable of this type can be used to either ensure math mode
 131  * or delay the writing of a pending brace when outputting LaTeX.
 132  *
 133  * Example 1:
 134  *
 135  *      MathEnsurer ensurer(os);
 136  *
 137  * If not already in math mode, inserts an \ensuremath command followed
 138  * by an open brace. This brace will be automatically closed when exiting
 139  * math mode. Math mode is automatically exited when writing something
 140  * that doesn't explicitly require math mode.
 141  *
 142  * Example 2:
 143  *
 144  *      MathEnsurer ensurer(os, false);
 145  *
 146  * Simply suspend writing a closing brace until the end of ensurer's scope.
 147  *
 148  * Example 3:
 149  *
 150  *      MathEnsurer ensurer(os, needs_math_mode, true);
 151  *
 152  * The third parameter is set to true only for a user defined macro, which
 153  * needs special handling. When it is a MathMacro, the needs_math_mode
 154  * parameter is true and the behavior is as in Example 1. When the
 155  * needs_math_mode parameter is false (not a MathMacro) and the macro
 156  * was entered in a text box and we are in math mode, the mode is reset
 157  * to text. This is because the macro was probably designed for text mode
 158  * (given that it was entered in text mode and we have no way to tell the
 159  * contrary).
 160  */
 161 class MathEnsurer
 162 {
 163 public:
 164         ///
 165         explicit MathEnsurer(WriteStream & os, bool needs_math_mode = true, bool macro = false)
 166                 : os_(os), brace_(ensureMath(os, needs_math_mode, macro)) {}
 167         ///
 168         ~MathEnsurer() { os_.pendingBrace(brace_); }
 169 private:
 170         ///
 171         WriteStream & os_;
 172         ///
 173         bool brace_;
 174 };
 175
 176
 177 /**
 178  * ModeSpecifier - utility class for specifying a given mode (math or text)
 179  *
 180  * A local variable of this type can be used to specify that a command or
 181  * environment works in a given mode. For example, \mbox works in text
 182  * mode, but \boxed works in math mode. Note that no mode changing commands
 183  * are needed, but we have to track the current mode, hence this class.
 184  * This is only used when exporting to latex and helps determining whether
 185  * the mode needs being temporarily switched when a command would not work
 186  * in the current mode. As there are cases where this switching is to be
 187  * avoided, the optional third parameter can be used to lock the mode.
 188  *
 189  * Example 1:
 190  *
 191  *      ModeSpecifier specifier(os, TEXT_MODE);
 192  *
 193  * Sets the current mode to text mode and allows mode switching.
 194  *
 195  * Example 2:
 196  *
 197  *      ModeSpecifier specifier(os, TEXT_MODE, true);
 198  *
 199  * Sets the current mode to text mode and disallows mode switching.
 200  *
 201  * At the end of specifier's scope the mode is reset to its previous value.
 202  */
 203 class ModeSpecifier
 204 {
 205 public:
 206         ///
 207         explicit ModeSpecifier(WriteStream & os, InsetMath::mode_type mode,
 208                                 bool locked = false)
 209                 : os_(os), oldmodes_(ensureMode(os, mode, locked)) {}
 210         ///
 211         ~ModeSpecifier()
 212         {
 213                 os_.textMode(oldmodes_ & 1);
 214                 os_.lockedMode(oldmodes_ & 2);
 215         }
 216 private:
 217         ///
 218         WriteStream & os_;
 219         ///
 220         int oldmodes_;
 221 };
 222
 223
 224
 225 //
 226 //  MathML
 227 //
 228
 229 class MTag {
 230 public:
 231         ///
 232         MTag(char const * const tag) : tag_(tag) {}
 233         ///
 234         char const * const tag_;
 235 };
 236
 237 class ETag {
 238 public:
 239         ///
 240         ETag(char const * const tag) : tag_(tag) {}
 241         ///
 242         char const * const tag_;
 243 };
 244
 245 class MathStream {
 246 public:
 247         ///
 248         explicit MathStream(odocstream & os);
 249         ///
 250         void cr();
 251         ///
 252         odocstream & os() { return os_; }
 253         ///
 254         int line() const { return line_; }
 255         ///
 256         int & tab() { return tab_; }
 257         ///
 258         friend MathStream & operator<<(MathStream &, char const *);
 259 private:
 260         ///
 261         odocstream & os_;
 262         ///
 263         int tab_;
 264         ///
 265         int line_;
 266         ///
 267         char lastchar_;
 268 };
 269
 270 ///
 271 MathStream & operator<<(MathStream &, MathAtom const &);
 272 ///
 273 MathStream & operator<<(MathStream &, MathData const &);
 274 ///
 275 MathStream & operator<<(MathStream &, docstring const &);
 276 ///
 277 MathStream & operator<<(MathStream &, char const *);
 278 ///
 279 MathStream & operator<<(MathStream &, char);
 280 ///
 281 MathStream & operator<<(MathStream &, MTag const &);
 282 ///
 283 MathStream & operator<<(MathStream &, ETag const &);
 284
 285
 286
 287 //
 288 // Debugging
 289 //
 290
 291 class NormalStream {
 292 public:
 293         ///
 294         explicit NormalStream(odocstream & os) : os_(os) {}
 295         ///
 296         odocstream & os() { return os_; }
 297 private:
 298         ///
 299         odocstream & os_;
 300 };
 301
 302 ///
 303 NormalStream & operator<<(NormalStream &, MathAtom const &);
 304 ///
 305 NormalStream & operator<<(NormalStream &, MathData const &);
 306 ///
 307 NormalStream & operator<<(NormalStream &, docstring const &);
 308 ///
 309 NormalStream & operator<<(NormalStream &, char const *);
 310 ///
 311 NormalStream & operator<<(NormalStream &, char);
 312 ///
 313 NormalStream & operator<<(NormalStream &, int);
 314
 315
 316 //
 317 // Maple
 318 //
 319
 320
 321 class MapleStream {
 322 public:
 323         ///
 324         explicit MapleStream(odocstream & os) : os_(os) {}
 325         ///
 326         odocstream & os() { return os_; }
 327 private:
 328         ///
 329         odocstream & os_;
 330 };
 331
 332
 333 ///
 334 MapleStream & operator<<(MapleStream &, MathAtom const &);
 335 ///
 336 MapleStream & operator<<(MapleStream &, MathData const &);
 337 ///
 338 MapleStream & operator<<(MapleStream &, docstring const &);
 339 ///
 340 MapleStream & operator<<(MapleStream &, char_type);
 341 ///
 342 MapleStream & operator<<(MapleStream &, char const *);
 343 ///
 344 MapleStream & operator<<(MapleStream &, char);
 345 ///
 346 MapleStream & operator<<(MapleStream &, int);
 347
 348
 349 //
 350 // Maxima
 351 //
 352
 353
 354 class MaximaStream {
 355 public:
 356         ///
 357         explicit MaximaStream(odocstream & os) : os_(os) {}
 358         ///
 359         odocstream & os() { return os_; }
 360 private:
 361         ///
 362         odocstream & os_;
 363 };
 364
 365
 366 ///
 367 MaximaStream & operator<<(MaximaStream &, MathAtom const &);
 368 ///
 369 MaximaStream & operator<<(MaximaStream &, MathData const &);
 370 ///
 371 MaximaStream & operator<<(MaximaStream &, docstring const &);
 372 ///
 373 MaximaStream & operator<<(MaximaStream &, char_type);
 374 ///
 375 MaximaStream & operator<<(MaximaStream &, char const *);
 376 ///
 377 MaximaStream & operator<<(MaximaStream &, char);
 378 ///
 379 MaximaStream & operator<<(MaximaStream &, int);
 380
 381
 382 //
 383 // Mathematica
 384 //
 385
 386
 387 class MathematicaStream {
 388 public:
 389         ///
 390         explicit MathematicaStream(odocstream & os) : os_(os) {}
 391         ///
 392         odocstream & os() { return os_; }
 393 private:
 394         ///
 395         odocstream & os_;
 396 };
 397
 398
 399 ///
 400 MathematicaStream & operator<<(MathematicaStream &, MathAtom const &);
 401 ///
 402 MathematicaStream & operator<<(MathematicaStream &, MathData const &);
 403 ///
 404 MathematicaStream & operator<<(MathematicaStream &, docstring const &);
 405 ///
 406 MathematicaStream & operator<<(MathematicaStream &, char const *);
 407 ///
 408 MathematicaStream & operator<<(MathematicaStream &, char);
 409 ///
 410 MathematicaStream & operator<<(MathematicaStream &, int);
 411
 412
 413 //
 414 // Octave
 415 //
 416
 417
 418 class OctaveStream {
 419 public:
 420         ///
 421         explicit OctaveStream(odocstream & os) : os_(os) {}
 422         ///
 423         odocstream & os() { return os_; }
 424 private:
 425         ///
 426         odocstream & os_;
 427 };
 428
 429 ///
 430 OctaveStream & operator<<(OctaveStream &, MathAtom const &);
 431 ///
 432 OctaveStream & operator<<(OctaveStream &, MathData const &);
 433 ///
 434 OctaveStream & operator<<(OctaveStream &, docstring const &);
 435 ///
 436 OctaveStream & operator<<(OctaveStream &, char_type);
 437 ///
 438 OctaveStream & operator<<(OctaveStream &, char const *);
 439 ///
 440 OctaveStream & operator<<(OctaveStream &, char);
 441 ///
 442 OctaveStream & operator<<(OctaveStream &, int);
 443
 444 } // namespace lyx
 445
 446 #endif