Calculator

- Added standalone calculator utility.

src/.gitignore

@@ -3,3 +3,4 @@ Makefile.in
 *_test
 args
 parser
+calc

src/CMakeLists.txt

@@ -60,11 +60,13 @@ set (task_SRCS A3.cpp A3.h
 
 add_library (task STATIC ${task_SRCS})
 add_executable (task_executable   main.cpp)
+add_executable (calc_executable   calc.cpp)
 add_executable (parser_executable bnf.cpp)
 add_executable (args_executable   args.cpp)
 
 # Yes, 'task' is included twice, otherwise linking fails on assorted OSes.
 target_link_libraries (task_executable task commands columns task ${TASK_LIBRARIES})
+target_link_libraries (calc_executable task commands columns task ${TASK_LIBRARIES})
 target_link_libraries (parser_executable task commands columns task ${TASK_LIBRARIES})
 target_link_libraries (args_executable   task commands columns task ${TASK_LIBRARIES})
 
@@ -72,6 +74,7 @@ set_property (TARGET task_executable PROPERTY OUTPUT_NAME "task")
 
 install (TARGETS task_executable DESTINATION ${TASK_BINDIR})
 
+set_property (TARGET calc_executable PROPERTY OUTPUT_NAME "calc")
 set_property (TARGET parser_executable PROPERTY OUTPUT_NAME "parser")
 set_property (TARGET args_executable   PROPERTY OUTPUT_NAME "args")
 

src/calc.cpp

@@ -0,0 +1,165 @@
+////////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2013 - 2014, Göteborg Bit Factory.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+// http://www.opensource.org/licenses/mit-license.php
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include <cmake.h>
+#include <iostream>
+#include <string>
+#include <stdlib.h>
+#include <string.h>
+#include <Eval.h>
+#include <Dates.h>
+#include <Context.h>
+#include <text.h>
+#include <i18n.h>
+
+Context context;
+
+////////////////////////////////////////////////////////////////////////////////
+// Constants.
+bool get (const std::string& name, Variant& value)
+{
+/*
+  // An example, although a bad one because this is supported by default.
+  if (name == "pi") {value = Variant (3.14159165); return true;}
+*/
+
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+int main (int argc, char** argv)
+{
+  int status = 0;
+
+  try
+  {
+    bool infix     = true;
+    bool ambiguous = true;
+
+    // Add a source for constants.
+    Eval e;
+    e.addSource (namedDates);
+    e.addSource (get);
+
+    // Combine all the arguments into one expression string.
+    std::string expression;
+    for (int i = 1; i < argc; i++)
+      if (!strcmp (argv[i], "-h") || ! strcmp (argv[i], "--help"))
+      {
+        std::cout << "\n"
+                  << "Usage: " << argv[0] << " [options] "
+                  << (infix ? "'<infix expression>'" : "'<postfix expression>'")
+                   << "\n"
+                  << "\n"
+                  << "Options:\n"
+                  << "  -h|--help         Display this usage\n"
+                  << "  -d|--debug        Debug mode\n"
+                  << "  -i|--infix        Infix expression (default)\n"
+                  << "  -p|--postfix      Postfix expression\n"
+                  << "  -a|--ambiguous    Choose dates over numbers when ambiguous (default)\n"
+                  << "  -n|--noambiguous  Choose numbers over dates when ambiguous\n"
+                  << "\n";
+        exit (1);
+      }
+      else if (!strcmp (argv[i], "-v") || !strcmp (argv[i], "--version"))
+      {
+        std::cout << "\n"
+                  << format (STRING_CMD_VERSION_BUILT, "calc", VERSION)
+#if defined (DARWIN)
+                  << "darwin"
+#elif defined (SOLARIS)
+                  << "solaris"
+#elif defined (CYGWIN)
+                  << "cygwin"
+#elif defined (HAIKU)
+                  << "haiku"
+#elif defined (OPENBSD)
+                  << "openbsd"
+#elif defined (FREEBSD)
+                  << "freebsd"
+#elif defined (NETBSD)
+                  << "netbsd"
+#elif defined (LINUX)
+                  << "linux"
+#elif defined (KFREEBSD)
+                  << "gnu-kfreebsd"
+#elif defined (GNUHURD)
+                  << "gnu-hurd"
+#else
+                  << STRING_CMD_VERSION_UNKNOWN
+#endif
+                  << "\n"
+                  << STRING_CMD_VERSION_COPY
+                  << "\n"
+                  << "\n"
+                  << STRING_CMD_VERSION_MIT
+                  << "\n"
+                  << "\n";
+
+        exit (1);
+      }
+      else if (!strcmp (argv[i], "-d") || !strcmp (argv[i], "--debug"))
+        e.debug ();
+      else if (!strcmp (argv[i], "-i") || !strcmp (argv[i], "--infix"))
+        infix = true;
+      else if (!strcmp (argv[i], "-p") || !strcmp (argv[i], "--postfix"))
+        infix = false;
+      else if (!strcmp (argv[i], "-a") || !strcmp (argv[i], "--ambiguous"))
+        ambiguous = true;
+      else if (!strcmp (argv[i], "-n") || !strcmp (argv[i], "--noambiguous"))
+        ambiguous = false;
+      else
+        expression += std::string (argv[i]) + " ";
+
+    e.ambiguity (ambiguous);
+
+    Variant result;
+    if (infix)
+      e.evaluateInfixExpression (expression, result);
+    else
+      e.evaluatePostfixExpression (expression, result);
+
+    // Show the result in string form.
+    std::cout << (std::string) result
+              << "\n";
+  }
+
+  catch (const std::string& error)
+  {
+    std::cerr << error << "\n";
+    status = -1;
+  }
+
+  catch (...)
+  {
+    std::cerr << "Unknown error occured.  Oops.\n";
+    status = -2;
+  }
+
+  return status;
+}
+
+////////////////////////////////////////////////////////////////////////////////

src/commands/CmdCalc.cpp

@@ -47,6 +47,8 @@ int CmdCalc::execute (std::string& output)
 {
   int rc = 0;
 
+  // TODO Configurable infix/postfix
+  // TODO Configurable date/number precedence
 
   return rc;
 }