From ffc99771b95a0b01371779d9d30f9d0400054691 Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Tue, 4 Dec 2018 08:29:58 +1100
Subject: Backport: Bug [#2062]. Interpret continued preprocessor lines
 correctly by reading all of the logical line.

Backport of changeset 7182:a40b6aac5b1f.
---
 doc/ScintillaHistory.html |  5 +++++
 lexers/LexCPP.cxx         | 30 ++++++++++++++++++++----------
 2 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/doc/ScintillaHistory.html b/doc/ScintillaHistory.html
index 164563cbb..b8225bcc5 100644
--- a/doc/ScintillaHistory.html
+++ b/doc/ScintillaHistory.html
@@ -557,6 +557,11 @@
  	<li>
 	The Bash lexer implements substyles for multiple sets of keywords and supports SCI_PROPERTYNAMES.
 	<a href="https://sourceforge.net/p/scintilla/bugs/2054/">Bug #2054</a>.
+ 	<li>
+	The C++ lexer interprets continued preprocessor lines correctly by reading all of
+	the logical line.
+	<a href="https://sourceforge.net/p/scintilla/bugs/2062/">Bug #2062</a>.
+	</li>
 	</li>
 	<li>
 	Notify with SC_UPDATE_SELECTION when user performs a multiple selection add.
diff --git a/lexers/LexCPP.cxx b/lexers/LexCPP.cxx
index 3dac142ab..e8cb75e43 100644
--- a/lexers/LexCPP.cxx
+++ b/lexers/LexCPP.cxx
@@ -201,17 +201,27 @@ struct EscapeSequence {
 
 std::string GetRestOfLine(LexAccessor &styler, Sci_Position start, bool allowSpace) {
 	std::string restOfLine;
-	Sci_Position i =0;
+	Sci_Position line = styler.GetLine(start);
+	Sci_Position pos = start;
+	Sci_Position endLine = styler.LineEnd(line);
 	char ch = styler.SafeGetCharAt(start, '\n');
-	const Sci_Position endLine = styler.LineEnd(styler.GetLine(start));
-	while (((start+i) < endLine) && (ch != '\r')) {
-		const char chNext = styler.SafeGetCharAt(start + i + 1, '\n');
-		if (ch == '/' && (chNext == '/' || chNext == '*'))
-			break;
-		if (allowSpace || (ch != ' '))
-			restOfLine += ch;
-		i++;
-		ch = chNext;
+	while (pos < endLine) {
+		if (ch == '\\' && ((pos + 1) == endLine)) {
+			// Continuation line
+			line++;
+			pos = styler.LineStart(line);
+			endLine = styler.LineEnd(line);
+			ch = styler.SafeGetCharAt(pos, '\n');
+		} else {
+			const char chNext = styler.SafeGetCharAt(pos + 1, '\n');
+			if (ch == '/' && (chNext == '/' || chNext == '*'))
+				break;
+			if (allowSpace || (ch != ' ')) {
+				restOfLine += ch;
+			}
+			pos++;
+			ch = chNext;
+		}
 	}
 	return restOfLine;
 }
-- 
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