Add support for SQL lexer reuse

2 files changed, 23 insertions, 7 deletions

diff --git a/odb/sql-lexer.cxx b/odb/sql-lexer.cxx
index a3d144d..b29138e 100644
--- a/odb/sql-lexer.cxx
+++ b/odb/sql-lexer.cxx
@@ -9,15 +9,28 @@
 using namespace std;
 
 sql_lexer::
+sql_lexer ()
+    : loc_ ("C"), buf_ (0, 0, 0)
+{
+}
+
+sql_lexer::
 sql_lexer (std::string const& sql)
-    : loc_ ("C"),
-      is_ (sql),
-      l_ (1),
-      c_(1),
-      eos_ (false),
-      buf_ (0, 0, 0),
-      unget_ (false)
+    : loc_ ("C"), buf_ (0, 0, 0)
 {
+  lex (sql);
+}
+
+void sql_lexer::
+lex (std::string const& sql)
+{
+  is_.str (sql);
+  is_.clear ();
+
+  l_ = c_ = 1;
+  buf_ = xchar (0, 0, 0);
+  eos_ = false;
+  unget_  = false;
 }
 
 sql_lexer::xchar sql_lexer::
diff --git a/odb/sql-lexer.hxx b/odb/sql-lexer.hxx
index adeff37..bb1c56e 100644
--- a/odb/sql-lexer.hxx
+++ b/odb/sql-lexer.hxx
@@ -15,8 +15,11 @@
 class sql_lexer
 {
 public:
+  sql_lexer ();
   sql_lexer (std::string const& sql);
 
+  void lex (std::string const& sql);
+
   struct invalid_input
   {
     invalid_input (std::size_t l, std::size_t c, std::string const& m)