Handle #line directives in C/C++ lexer

This way the parser now reports logical rather than physical location in
diagnostics.

1 files changed, 29 insertions, 8 deletions

diff --git a/unit-tests/cc/lexer/driver.cxx b/unit-tests/cc/lexer/driver.cxx
index db3f516..5803a88 100644
--- a/unit-tests/cc/lexer/driver.cxx
+++ b/unit-tests/cc/lexer/driver.cxx
@@ -16,38 +16,59 @@ namespace build2
 {
   namespace cc
   {
-    // Usage: argv[0] [<file>]
+    // Usage: argv[0] [-l] [<file>]
     //
     int
     main (int argc, char* argv[])
     {
+      bool loc (false);
+      const char* file (nullptr);
+
+      for (int i (1); i != argc; ++i)
+      {
+        string a (argv[i]);
+
+        if (a == "-l")
+          loc = true;
+        else
+        {
+          file = argv[i];
+          break;
+        }
+      }
+
       try
       {
         istream* is;
-        const char* in;
 
         // Reading from file is several times faster.
         //
         ifdstream ifs;
-        if (argc > 1)
+        if (file != nullptr)
         {
-          in = argv[1];
-          ifs.open (in);
+          ifs.open (file);
           is = &ifs;
         }
         else
         {
-          in = "stdin";
+          file = "stdin";
           cin.exceptions (istream::failbit | istream::badbit);
           is = &cin;
         }
 
-        lexer l (*is, path (in));
+        lexer l (*is, path (file));
 
         // No use printing eos since we will either get it or loop forever.
         //
         for (token t; l.next (t) != token_type::eos; )
-          cout << t << endl;
+        {
+          cout << t;
+
+          if (loc)
+            cout << ' ' << t.file << ':' << t.line << ':' << t.column;
+
+          cout << endl;
+        }
       }
       catch (const failed&)
       {