math: Restore toleration of unexpected characters in an expression

Prior to commit 7c4c13ffef (math: Reject unexpected expression input
explicitly, 2018-05-18) we ignored unexpected characters in an
expression that otherwise can be parsed.  In order to preserve
compatibility with projects that accidentally used this, convert the
error to a warning.

1 files changed, 9 insertions, 0 deletions

diff --git a/Source/cmExprParserHelper.cxx b/Source/cmExprParserHelper.cxx
index 821667b..8d3dad7 100644
--- a/Source/cmExprParserHelper.cxx
+++ b/Source/cmExprParserHelper.cxx
@@ -101,6 +101,15 @@ void cmExprParserHelper::Error(const char* str)
   this->ErrorString = ostr.str();
 }
 
+void cmExprParserHelper::UnexpectedChar(char c)
+{
+  unsigned long pos = static_cast<unsigned long>(this->InputBufferPos);
+  std::ostringstream ostr;
+  ostr << "Unexpected character in expression at position " << pos << ": " << c
+       << "\n";
+  this->WarningString += ostr.str();
+}
+
 void cmExprParserHelper::SetResult(KWIML_INT_int64_t value)
 {
   this->Result = value;