Attempting to fix the curly brackets bug

src/mminou.c

@@ -501,7 +501,7 @@ void printLongLine(const char *line, const char *startNextLine, const char *brea
   vstring_def(prefix);
   vstring_def(startNextLine1);
   vstring_def(breakMatch1);
-  long i, j, p;
+  long i, j, p, k;
   long startNextLineLen;
   flag firstLine;
   flag tildeFlag = 0;
@@ -546,6 +546,12 @@ void printLongLine(const char *line, const char *startNextLine, const char *brea
     breakMatch1[0] = ' '; // Change to a space (the real break character)
   }
 
+  // Do a bug check to make sure no real ASCII 3's are ever printed
+  j = (long)strlen(multiLine);
+  for (i = 0; i < j; i++) {
+    if (multiLine[i] == QUOTED_SPACE) bug(1514); // Should never be the case
+  }
+
   // HTML mode
   // The HTML mode is intended not to break inside quoted HTML tag
   // strings.  All HTML output should be called with this mode.
@@ -559,11 +565,6 @@ void printLongLine(const char *line, const char *startNextLine, const char *brea
   // where all ASCII 3's are converted back to space.
   // Note added 20-Oct-02: tidy.exe breaks HREF quotes with new line.
   // Check HTML spec - do we really need this code?
-  j = (long)strlen(multiLine);
-  // Do a bug check to make sure no real ASCII 3's are ever printed
-  for (i = 0; i < j; i++) {
-    if (multiLine[i] == QUOTED_SPACE) bug(1514); // Should never be the case
-  }
   if (breakMatch1[0] == '\"') {
     breakMatch1[0] = ' '; // Change to a space (the real break character)
     // Scan string for quoted strings
@@ -587,6 +588,26 @@ void printLongLine(const char *line, const char *startNextLine, const char *brea
     }
   } // if (breakMatch1[0] == '\"')
 
+  // TeX mode
+  // The TeX mode is intended not to break inside curly brace scopes.
+  // Whenever we are inside a scope of curly braces, we change a space to
+  // ASCII 3 to prevent matching it.  The reverse is done in the print2()
+  // function, where all ASCII 3's are converted back to space.
+  if (breakMatch1[0] == ' ') {
+    i = 0;
+    // k counts the scope level we are in.
+    k = 0;
+    while (multiLine[i]) {
+      // We enter a non "\{" scope.
+      if (multiLine[i] == '{' && multiLine[i - 1] != '\\') k++;
+      // We escape a non "\}" scope.
+      if (multiLine[i] == '}' && multiLine[i - 1] != '\\') k--;
+      // If k > 0 then we are inside a scope.
+      if (multiLine[i] == ' ' && k > 0) multiLine[i] = QUOTED_SPACE;
+      i++;
+    }
+  }
+
   // The tilde is a special flag for printLongLine to print a
   // tilde before the carriage return in a split line, not after.
   if (startNextLine1[0] == '~') {