+/// ensure math mode, possibly by opening \ensuremath
+bool ensureMath(WriteStream & os, bool needs_math_mode = true, bool macro = false);
+
+/// ensure the requested mode, possibly by closing \ensuremath
+bool ensureMode(WriteStream & os, InsetMath::mode_type mode);
+
+
+/**
+ * MathEnsurer - utility class for ensuring math mode
+ *
+ * A local variable of this type can be used to either ensure math mode
+ * or delay the writing of a pending brace when outputting LaTeX.
+ *
+ * Example 1:
+ *
+ * MathEnsurer ensurer(os);
+ *
+ * If not already in math mode, inserts an \ensuremath command followed
+ * by an open brace. This brace will be automatically closed when exiting
+ * math mode. Math mode is automatically exited when writing something
+ * that doesn't explicitly require math mode.
+ *
+ * Example 2:
+ *
+ * MathEnsurer ensurer(os, false);
+ *
+ * Simply suspend writing a closing brace until the end of ensurer's scope.
+ *
+ * Example 3:
+ *
+ * MathEnsurer ensurer(os, needs_math_mode, true);
+ *
+ * The third parameter is set to true only for a user defined macro, which
+ * needs special handling. When it is a MathMacro, the needs_math_mode
+ * parameter is true and the behavior is as in Example 1. When the
+ * needs_math_mode parameter is false (not a MathMacro) and the macro
+ * was entered in a text box and we are in math mode, the mode is reset
+ * to text. This is because the macro was probably designed for text mode
+ * (given that it was entered in text mode and we have no way to tell the
+ * contrary).
+ */
+class MathEnsurer
+{
+public:
+ ///
+ explicit MathEnsurer(WriteStream & os, bool needs_math_mode = true, bool macro = false)
+ : os_(os), brace_(ensureMath(os, needs_math_mode, macro)) {}
+ ///
+ ~MathEnsurer() { os_.pendingBrace(brace_); }
+private:
+ ///
+ WriteStream & os_;
+ ///
+ bool brace_;
+};
+
+
+/**
+ * ModeSpecifier - utility class for specifying a given mode (math or text)
+ *
+ * A local variable of this type can be used to specify that a command or
+ * environment works in a given mode. For example, \mbox works in text
+ * mode, but \boxed works in math mode. Note that no mode changing commands
+ * are needed, but we have to track the current mode, hence this class.
+ *
+ * Example:
+ *
+ * ModeSpecifier specifier(os, TEXT_MODE);
+ *
+ * Sets the current mode to text mode.
+ *
+ * At the end of specifier's scope the mode is reset to its previous value.
+ */
+class ModeSpecifier
+{
+public:
+ ///
+ explicit ModeSpecifier(WriteStream & os, InsetMath::mode_type mode)
+ : os_(os), textmode_(ensureMode(os, mode)) {}
+ ///
+ ~ModeSpecifier() { os_.textMode(textmode_); }
+private:
+ ///
+ WriteStream & os_;
+ ///
+ bool textmode_;
+};
+