From f8edfd22cb45b554a573d2722900196758e9e958 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 10 Dec 2009 09:47:29 +0200
Subject: Scanner-based parsing with support for element erasing

Also implement argv_file_scanner which provides support for reading command
line arguments from the argv array as well as files specified with command
line options. New examples: file. New tests: ctor, erase, file.
---
 cli/runtime-header.cxx | 82 +++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 78 insertions(+), 4 deletions(-)

(limited to 'cli/runtime-header.cxx')

diff --git a/cli/runtime-header.cxx b/cli/runtime-header.cxx
index cf3ebd3..5da33c0 100644
--- a/cli/runtime-header.cxx
+++ b/cli/runtime-header.cxx
@@ -12,6 +12,9 @@ generate_runtime_header (context& ctx)
 {
   ostream& os (ctx.os);
 
+  if (ctx.options.generate_file_scanner ())
+    os << "#include <deque>" << endl;
+
   os << "#include <iosfwd>" << endl
      << "#include <string>" << endl
      << "#include <exception>" << endl
@@ -155,6 +158,30 @@ generate_runtime_header (context& ctx)
      << "what () const throw ();"
      << "};";
 
+  if (ctx.options.generate_file_scanner ())
+  {
+    os << "class file_io_failure: public exception"
+       << "{"
+       << "public:" << endl
+       << "virtual" << endl
+       << "~file_io_failure () throw ();"
+       << endl
+       << "file_io_failure (const std::string& file);"
+       << endl
+       << "const std::string&" << endl
+       << "file () const;"
+       << endl
+       << "virtual void" << endl
+       << "print (std::ostream&) const;"
+       << endl
+       << "virtual const char*" << endl
+       << "what () const throw ();"
+       << endl
+       << "private:" << endl
+       << "std::string file_;"
+       << "};";
+  }
+
   // scanner
   //
   os << "class scanner"
@@ -181,8 +208,8 @@ generate_runtime_header (context& ctx)
   os << "class argv_scanner: public scanner"
      << "{"
      << "public:" << endl
-     << "argv_scanner (int argc, char** argv);"
-     << "argv_scanner (int start, int argc, char** argv);"
+     << "argv_scanner (int& argc, char** argv, bool erase = false);"
+     << "argv_scanner (int start, int& argc, char** argv, bool erase = false);"
      << endl
      << "int" << endl
      << "end () const;"
@@ -199,11 +226,58 @@ generate_runtime_header (context& ctx)
      << "virtual void" << endl
      << "skip ();"
      << endl
-     << "private:"
+     << "private:" << endl
      << "int i_;"
-     << "int argc_;"
+     << "int& argc_;"
      << "char** argv_;"
+     << "bool erase_;"
      << "};";
 
+  // argv_file_scanner
+  //
+  if (ctx.options.generate_file_scanner ())
+  {
+    os << "class argv_file_scanner: public argv_scanner"
+       << "{"
+       << "public:" << endl
+       << "argv_file_scanner (int& argc," << endl
+       << "char** argv," << endl
+       << "const std::string& file_option," << endl
+       << "bool erase = false);"
+       << endl
+       << "argv_file_scanner (int start," << endl
+       << "int& argc," << endl
+       << "char** argv," << endl
+       << "const std::string& file_option," << endl
+       << "bool erase = false);"
+       << endl
+       << "virtual bool" << endl
+       << "more ();"
+       << endl
+       << "virtual const char*" << endl
+       << "peek ();"
+       << endl
+       << "virtual const char*" << endl
+       << "next ();"
+       << endl
+       << "virtual void" << endl
+       << "skip ();"
+       << endl
+       << "private:" << endl
+       << "void" << endl
+       << "load (const char* file);"
+       << endl
+       << "typedef argv_scanner base;"
+       << endl
+       << "const std::string option_;"
+       << "std::string hold_;"
+       << "std::deque<std::string> args_;";
+
+    if (!ctx.opt_sep.empty ())
+      os << "bool skip_;";
+
+    os << "};";
+  }
+
   os << "}"; // namespace cli
 }
-- 
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