taskwarrior/src/commands/CmdCalc.cpp
Paul Beckingham 79abddd03d Parser
- Renamed A3t to Parser.
2014-05-25 09:44:22 -04:00

94 lines
3.1 KiB
C++

////////////////////////////////////////////////////////////////////////////////
//
// Copyright 2006 - 2014, Paul Beckingham, Federico Hernandez.
//
// 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 <Context.h>
#include <Eval.h>
#include <Dates.h>
#include <main.h>
#include <i18n.h>
#include <CmdCalc.h>
extern Context context;
////////////////////////////////////////////////////////////////////////////////
static bool domSource (const std::string& name, Variant& value)
{
Task t;
std::string resolved = context.dom.get (name, t);
if (resolved != name)
{
value = Variant (resolved);
return true;
}
return false;
}
////////////////////////////////////////////////////////////////////////////////
CmdCalc::CmdCalc ()
{
_keyword = "calc";
_usage = "task calc <expression>";
_description = STRING_CMD_CALC_USAGE;
_read_only = true;
_displays_id = false;
}
////////////////////////////////////////////////////////////////////////////////
int CmdCalc::execute (std::string& output)
{
// Configurable infix/postfix
bool infix = true;
if (context.config.get ("expressions") == "infix")
infix = true;
else if (context.config.get ("expressions") == "postfix")
infix = false;
// Create an evaluator with DOM access.
Eval e;
e.addSource (namedDates);
e.addSource (domSource);
e.ambiguity (false); // TODO Could/should be configurable.
// Compile all the args into one expression.
std::string expression;
std::vector <std::string> words = context.parser.getWords ();
std::vector <std::string>::iterator word;
for (word = words.begin (); word != words.end (); ++word)
expression += *word + " ";
// Evaluate according to preference.
Variant result;
if (infix)
e.evaluateInfixExpression (expression, result);
else
e.evaluatePostfixExpression (expression, result);
output = (std::string) result + "\n";
return 0;
}
////////////////////////////////////////////////////////////////////////////////