New calling conventions, start on print.cpp

luprex/core/cpp/print.hpp

@@ -0,0 +1,46 @@
+/////////////////////////////////////////////////////////
+//
+// Pretty-print routine.
+//
+// The pretty-printer can be called from C++ or Lua.
+//
+/////////////////////////////////////////////////////////
+
+#ifndef PRINT_HPP
+#define PRINT_HPP
+
+#include "luastack.hpp"
+
+// This file provides these functions for lua.
+//
+// They direct all output to std::cout
+//
+extern "C" {
+void luai_writestring(const char *s, size_t len);
+void luai_writeline();
+}
+
+// Pretty print to a stream.
+//
+// If indent is >=0, the output is indented.  If indent<0, then
+// the output is emitted without newlines or indentation.
+//
+// Maxlen specifies the maximum number of characters output.  If
+// this is exceeded, then the printout is truncated.
+//
+void pprint(LuaStack &LS, LuaSlot val, int indent, int maxlen, std::ostream *os);
+
+// The following lua interfaces to this code are included:
+//
+// pprint(expr)
+//
+// - pretty print the specified expression to stdout.
+//
+// string.pprint(expr, indent, maxlen)
+//
+// - pretty print the specified expression, return the result as a string.
+//
+void pprint_pprint(lua_State *L);
+void string_pprint(lua_State *L);
+
+#endif // PRINT_HPP