From 5968c3af2c26abe61cf98bf45f672835ef4b51ba Mon Sep 17 00:00:00 2001
From: deva <deva>
Date: Thu, 30 Oct 2008 13:09:47 +0000
Subject: Complete but highly unstable implementation of formattools.

---
 server/src/luaformatmapper.cc | 119 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 server/src/luaformatmapper.cc

(limited to 'server/src/luaformatmapper.cc')

diff --git a/server/src/luaformatmapper.cc b/server/src/luaformatmapper.cc
new file mode 100644
index 0000000..b45c170
--- /dev/null
+++ b/server/src/luaformatmapper.cc
@@ -0,0 +1,119 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            luaformatmapper.cc
+ *
+ *  Wed Oct 29 16:02:03 CET 2008
+ *  Copyright 2008 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of Pracro.
+ *
+ *  Pracro is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Pracro is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Pracro; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include "luaformatmapper.h"
+
+#include <sstream>
+
+#include "exception.h"
+
+static std::string loadresultstring(Fields &fields)
+{
+  std::string s;
+
+  Fields::iterator v = fields.begin();
+  while(v != fields.end()) {
+    s += (*v).first + " = \"" + (*v).second + "\"\n";
+    v++;
+  }
+
+  return s;
+}
+
+LUAFormatMapper::LUAFormatMapper(Fields &fields)
+{
+  L = luaL_newstate();
+  if(L == NULL) {
+    error("Could not create LUA state.");
+    return;
+  }
+
+  luaL_openlibs(L);
+
+  std::string preload = loadresultstring(fields);
+
+  if(luaL_loadbuffer(L, preload.c_str(), preload.size(), "preload")) {
+    error(lua_tostring(L, lua_gettop(L)));
+    return;
+  }
+
+  // Run program (init)
+  if(lua_pcall(L, 0, LUA_MULTRET, 0)) {
+    error(lua_tostring(L, lua_gettop(L)));
+    return;
+  }
+
+  clean_top = lua_gettop(L);
+}
+
+LUAFormatMapper::~LUAFormatMapper()
+{
+  lua_close(L);
+}
+
+std::string LUAFormatMapper::map(const std::string &mapper)
+{
+  output = "";
+
+  if(L == NULL) {
+    error("LUA state not initialized!");
+    return output;
+  }
+
+  if(mapper == "") {
+    error("Empty LUA mapper detected in " + mapper);
+    return output;
+  }
+
+  // Load the mapper
+  if(luaL_loadbuffer(L, mapper.c_str(), mapper.size(), "mapper")) {
+    error(lua_tostring(L, lua_gettop(L)) + std::string(" in ") + mapper);
+    return output;
+  }
+
+  // Run the loaded code
+  if(lua_pcall(L, 0, LUA_MULTRET, 0)) {
+    error(lua_tostring(L, lua_gettop(L)) + std::string(" in ") + mapper);
+    return output;
+  }
+
+  // Check if app messed up the stack.
+  if(lua_gettop(L) != clean_top + 1) {
+    error("Wrong number of return values in " + mapper);
+    lua_pop(L, lua_gettop(L) - clean_top);
+    return output;
+  }
+
+  output = lua_tostring(L, lua_gettop(L));
+  lua_pop(L, 1);
+
+  return output;
+}
+
+void LUAFormatMapper::error(std::string message)
+{
+  throw Exception("ERROR in LUAFormatMapper: " + message);
+}
-- 
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