cmRST: Fix crash on empty markup block
diff --git a/Source/cmRST.cxx b/Source/cmRST.cxx
index b7216b0..2064275 100644
--- a/Source/cmRST.cxx
+++ b/Source/cmRST.cxx
@@ -457,6 +457,12 @@
size_t trailingEmpty =
std::distance(rit, cmFindNot(cmReverseRange(lines), std::string()));
+ if ((leadingEmpty + trailingEmpty) >= lines.size()) {
+ // All lines are empty. The markup block is empty. Leave only one.
+ lines.resize(1);
+ return;
+ }
+
std::vector<std::string>::iterator contentEnd = cmRotate(
lines.begin(), lines.begin() + leadingEmpty, lines.end() - trailingEmpty);
lines.erase(contentEnd, lines.end());
diff --git a/Tests/CMakeLib/testRST.expect b/Tests/CMakeLib/testRST.expect
index d7b91d1..c19ee94 100644
--- a/Tests/CMakeLib/testRST.expect
+++ b/Tests/CMakeLib/testRST.expect
@@ -83,6 +83,10 @@
but not after a line ending in two colons::
in the middle of a paragraph.
+A literal block can be empty::
+
+
+
.. productionlist::
grammar: `production`
production: "content rendered"
diff --git a/Tests/CMakeLib/testRST.rst b/Tests/CMakeLib/testRST.rst
index 633219f..d2d1140 100644
--- a/Tests/CMakeLib/testRST.rst
+++ b/Tests/CMakeLib/testRST.rst
@@ -90,6 +90,10 @@
but not after a line ending in two colons::
in the middle of a paragraph.
+A literal block can be empty::
+
+
+
.. productionlist::
grammar: `production`
production: "content rendered"
