Added a new exception type for errors happened during file parsing.

Refs #7772

Code/Mantid/Framework/Kernel/inc/MantidKernel/Exception.h

@@ -39,7 +39,12 @@ namespace Kernel
         <li><b>std::range_error</b> - Thrown to indicate range errors in internal computations.</li>
         <li><b>std::overflow_error</b> - Thrown to indicate arithmetic overflow.</li>
         <li><b>std::underflow_error</b> - Thrown to indicate arithmetic underflow.</li>
-        <li><b>FileError</b> - Thrown to indicate errors with file operations.</li>
+        <li>
+          <b>FileError</b> - Thrown to indicate errors with file operations.
+          <ul>
+            <li><b>ParseError</b> - Thrown to indicate errors when parsing a file.</li>
+          </ul>
+        </li>
         <li><b>NotFoundError</b> - Thrown to indicate that an item was not found in a collection.</li>
         <li><b>ExistsError</b> - Thrown to indicate that an item was is already found in a collection.</li>
         <li><b>InstrumentDefinitionError</b> - Thrown to indicate a problem with the instrument definition.</li>
@@ -98,6 +103,33 @@ class MANTID_KERNEL_DLL FileError : public std::runtime_error
   const char* what() const throw();
 };
 
+/// Records the filename, the description of failure and the line on which it happened
+class MANTID_KERNEL_DLL ParseError : public FileError
+{
+ private:
+  /// Number of the line where the error occured
+  const int m_lineNumber;
+  /// The message returned by what()
+  std::string m_outMessage;
+
+ public:
+  /** 
+   * Constructor
+   * @param desc :: Error description
+   * @param fileName :: Filename where happened
+   * @param lineNumber :: Number of the line where error happened
+   */
+  ParseError(const std::string& desc, const std::string& fileName, const int& lineNumber);
+  /// Copy constructor
+  ParseError(const ParseError& A);
+  /// Assignment operator
+  ParseError& operator=(const ParseError& A);
+  /// Destructor
+  ~ParseError() throw() {}
+
+  const char* what() const throw();
+};
+
 /// Marks code as not implemented yet.
 class MANTID_KERNEL_DLL NotImplementedError : public std::logic_error
 {

Code/Mantid/Framework/Kernel/src/Exception.cpp

@@ -36,6 +36,26 @@ const char* FileError::what() const throw()
 	return outMessage.c_str();
 }
 
+//-------------------------
+// ParseError
+//-------------------------
+ParseError::ParseError(const std::string& desc, const std::string& fileName, const int& lineNumber)
+  : FileError(desc, fileName), m_lineNumber(lineNumber)
+{
+  std::stringstream ss;
+  ss << FileError::what() << " on line " << m_lineNumber;
+  m_outMessage = ss.str();
+}
+
+ParseError::ParseError(const ParseError& A) 
+  : FileError(A), m_lineNumber(A.m_lineNumber)
+{}
+
+const char* ParseError::what() const throw()
+{
+  return m_outMessage.c_str();
+}
+
 //-------------------------
 // NotImplementedError
 //-------------------------