From 2de1163efcde07edd731845e4c68ff8b597a40a8 Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Fri, 5 Aug 2011 11:23:00 +0000
Subject: [PATCH] Fix bug #253 (Incorrect protection of closing quotation
 marks)

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@39420 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/insets/InsetQuotes.cpp |  7 +++++--
 src/support/docstream.cpp  | 11 ++++++++++-
 src/support/docstream.h    |  9 ++++++++-
 3 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/src/insets/InsetQuotes.cpp b/src/insets/InsetQuotes.cpp
index 0792e15e91..8586ce18d5 100644
--- a/src/insets/InsetQuotes.cpp
+++ b/src/insets/InsetQuotes.cpp
@@ -287,8 +287,11 @@ void InsetQuotes::latex(otexstream & os, OutputParams const & runparams) const
 	}
 
 	// Always guard against unfortunate ligatures (!` ?`)
-	if (prefixIs(qstr, "`"))
-		qstr.insert(0, "{}");
+	if (prefixIs(qstr, "`")) {
+		char_type const lastchar = os.lastChar();
+		if (lastchar == '!' || lastchar == '?')
+			qstr.insert(0, "{}");
+	}
 
 	os << from_ascii(qstr);
 }
diff --git a/src/support/docstream.cpp b/src/support/docstream.cpp
index f5cf297c12..3fb0c03295 100644
--- a/src/support/docstream.cpp
+++ b/src/support/docstream.cpp
@@ -411,6 +411,7 @@ void otexstream::put(char_type const & c)
 		protectspace_ = false;
 	}
 	os_.put(c);
+	lastchar_ = c;
 	if (c == '\n') {
 		texrow_.newline();
 		canbreakline_ = false;
@@ -427,6 +428,7 @@ otexstream & operator<<(otexstream & ots, BreakLine)
 {
 	if (ots.canBreakLine()) {
 		ots.os().put('\n');
+		ots.lastChar('\n');
 		ots.canBreakLine(false);
 		ots.texrow().newline();
 	}
@@ -439,6 +441,7 @@ otexstream & operator<<(otexstream & ots, SafeBreakLine)
 {
 	if (ots.canBreakLine()) {
 		ots.os() << "%\n";
+		ots.lastChar('\n');
 		ots.canBreakLine(false);
 		ots.texrow().newline();
 	}
@@ -450,8 +453,10 @@ otexstream & operator<<(otexstream & ots, SafeBreakLine)
 otexstream & operator<<(otexstream & ots, odocstream_manip pf)
 {
 	ots.os() << pf;
-	if (pf == static_cast<odocstream_manip>(endl))
+	if (pf == static_cast<odocstream_manip>(endl)) {
+		ots.lastChar('\n');
 		ots.texrow().newline();
+	}
 	return ots;
 }
 
@@ -470,6 +475,7 @@ otexstream & operator<<(otexstream & ots, docstring const & s)
 		ots.protectSpace(false);
 	}
 	ots.os() << s;
+	ots.lastChar(s[len - 1]);
 	ots.texrow().newlines(count(s.begin(), s.end(), '\n'));
 	ots.canBreakLine(s[len - 1] != '\n');
 	return ots;
@@ -490,6 +496,7 @@ otexstream & operator<<(otexstream & ots, char const * s)
 		ots.protectSpace(false);
 	}
 	ots.os() << s;
+	ots.lastChar(s[len - 1]);
 	ots.texrow().newlines(count(s, s + len, '\n'));
 	ots.canBreakLine(s[len - 1] != '\n');
 	return ots;
@@ -504,6 +511,7 @@ otexstream & operator<<(otexstream & ots, char c)
 		ots.protectSpace(false);
 	}
 	ots.os() << c;
+	ots.lastChar(c);
 	if (c == '\n')
 		ots.texrow().newline();
 	ots.canBreakLine(c != '\n');
@@ -515,6 +523,7 @@ template <typename Type>
 otexstream & operator<<(otexstream & ots, Type value)
 {
 	ots.os() << value;
+	ots.lastChar(0);
 	ots.canBreakLine(true);
 	ots.protectSpace(false);
 	return ots;
diff --git a/src/support/docstream.h b/src/support/docstream.h
index 0ad6709685..f59030f923 100644
--- a/src/support/docstream.h
+++ b/src/support/docstream.h
@@ -93,6 +93,7 @@ typedef odocstream & (*odocstream_manip)(odocstream &);
     they were iomanip's to ensure that the next output will start at the
     beginning of a line. Using "breakln", a '\n' char will be output if needed,
     while using "safebreakln", "%\n" will be output if needed.
+    The class also records the last output character.
   */
 
 class otexstream {
@@ -100,7 +101,7 @@ public:
 	///
 	otexstream(odocstream & os, TexRow & texrow)
 		: os_(os), texrow_(texrow),
-		  canbreakline_(false), protectspace_(false) {}
+		  canbreakline_(false), protectspace_(false), lastchar_(0) {}
 	///
 	odocstream & os() { return os_; }
 	///
@@ -115,6 +116,10 @@ public:
 	void protectSpace(bool protectspace) { protectspace_ = protectspace; }
 	///
 	bool protectSpace() const { return protectspace_; }
+	///
+	void lastChar(char_type const & c) { lastchar_ = c; }
+	///
+	char_type lastChar() const { return lastchar_; }
 private:
 	///
 	odocstream & os_;
@@ -124,6 +129,8 @@ private:
 	bool canbreakline_;
 	///
 	bool protectspace_;
+	///
+	char_type lastchar_;
 };
 
 /// Helper structs for breaking a line