Fix bug 5802 (http://bugzilla.lyx.org/show_bug.cgi?id=5802)

[lyx.git] / src / mathed / InsetMathString.cpp

diff --git a/src/mathed/InsetMathString.cpp b/src/mathed/InsetMathString.cpp
index 1597d63191705a12dd1209c4b501a8bcc1e3c3de..552124a1435f1c7346a8788b8fabdd16b331e812 100644 (file)
--- a/src/mathed/InsetMathString.cpp
+++ b/src/mathed/InsetMathString.cpp
@@ -3,7 +3,7 @@
  * This file is part of LyX, the document processor.
  * Licence details can be found in the file COPYING.
  *
- * \author André Pönitz
+ * \author André Pönitz
  *
  * Full author contact details are available in file CREDITS.
  */
@@ -12,9 +12,14 @@
 
 #include "InsetMathString.h"
 #include "MathStream.h"
-#include "MathStream.h"
 #include "MathSupport.h"
 
+#include "Encoding.h"
+
+#include "support/gettext.h"
+#include "support/lstrings.h"
+#include "support/textutils.h"
+
 
 namespace lyx {
 
@@ -98,7 +103,99 @@ void InsetMathString::mathmlize(MathStream & os) const
 
 void InsetMathString::write(WriteStream & os) const
 {
-       os << str_;
+       if (!os.latex()) {
+               os << str_;
+               return;
+       }
+
+       docstring::const_iterator cit = str_.begin();
+       docstring::const_iterator end = str_.end();
+
+       // We may already be inside an \ensuremath command.
+       bool in_forced_mode = os.pendingBrace();
+
+       // Track italic shape inside \lyxmathsym
+       bool mathalpha = false;
+
+       // We will take care of matching braces.
+       os.pendingBrace(false);
+
+       while (cit != end) {
+               bool mathmode = in_forced_mode ? os.textMode() : !os.textMode();
+               char_type const c = *cit;
+               docstring command(1, c);
+               try {
+                       if (c < 0x80 || Encodings::latexMathChar(c, mathmode, os.encoding(), command)) {
+                               if (os.textMode()) {
+                                       if (in_forced_mode) {
+                                               // we were inside \lyxmathsym
+                                               os << '}';
+                                               os.textMode(false);
+                                               in_forced_mode = false;
+                                       }
+                                       if (c >= 0x80 && os.textMode()) {
+                                               os << "\\ensuremath{";
+                                               os.textMode(false);
+                                               in_forced_mode = true;
+                                       }
+                               } else if (c < 0x80 && in_forced_mode) {
+                                       // we were inside \ensuremath
+                                       os << '}';
+                                       os.textMode(true);
+                                       in_forced_mode = false;
+                               }
+                       } else if (!os.textMode()) {
+                                       if (in_forced_mode) {
+                                               // we were inside \ensuremath
+                                               os << '}';
+                                               in_forced_mode = false;
+                                       } else {
+                                               mathalpha = Encodings::isMathAlpha(c);
+                                               if (mathalpha)
+                                                       os << "\\lyxmathsym*{";
+                                               else
+                                                       os << "\\lyxmathsym{";
+                                               in_forced_mode = true;
+                                       }
+                                       os.textMode(true);
+                       } else if (in_forced_mode && mathalpha != Encodings::isMathAlpha(c)) {
+                               // we are already inside \lyxmathsym but
+                               // have to change the output shape
+                               mathalpha = !mathalpha;
+                               if (mathalpha)
+                                       os << "}\\lyxmathsym*{";
+                               else
+                                       os << "}\\lyxmathsym{";
+                       }
+                       os << command;
+                       // We may need a space if the command contains a macro
+                       // and the last char is ASCII.
+                       if (lyx::support::contains(command, '\\')
+                           && isAlphaASCII(command[command.size() - 1]))
+                               os.pendingSpace(true);
+               } catch (EncodingException & e) {
+                       if (os.dryrun()) {
+                               // FIXME: this is OK for View->Source
+                               // but math preview will likely fail.
+                               os << "<" << _("LyX Warning: ")
+                                  << _("uncodable character") << " '";
+                               os << docstring(1, e.failed_char);
+                               os << "'>";
+                       } else {
+                               // throw again
+                               throw(e);
+                       }
+               }
+               ++cit;
+       }
+
+       if (in_forced_mode && os.textMode()) {
+               // We have to care for closing \lyxmathsym
+               os << '}';
+               os.textMode(false);
+       } else {
+               os.pendingBrace(in_forced_mode);
+       }
 }