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taskwarrior-2.x/src/E9.cpp
Paul Beckingham a26b4ca12f Expression Operators 
- Implemented operator_equal, operator_inequal.
- Removed diagnostics for completed operators.
2011-07-28 23:38:37 -04:00

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////////////////////////////////////////////////////////////////////////////////
// taskwarrior - a command line task list manager.
//
// Copyright 2006 - 2011, Paul Beckingham, Federico Hernandez.
// All rights reserved.
//
// This program 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.
//
// This program 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
// this program; if not, write to the
//
// Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor,
// Boston, MA
// 02110-1301
// USA
//
////////////////////////////////////////////////////////////////////////////////
#include <iostream> // TODO Remove.
#include <Context.h>
#include <text.h>
#include <A3.h>
#include <E9.h>
extern Context context;
////////////////////////////////////////////////////////////////////////////////
// Perform all the necessary steps prior to an eval call.
E9::E9 (const A3& args)
{
std::vector <Arg>::const_iterator arg;
for (arg = args.begin (); arg != args.end (); ++arg)
_terms.push_back (Term (*arg));
}
////////////////////////////////////////////////////////////////////////////////
E9::~E9 ()
{
}
////////////////////////////////////////////////////////////////////////////////
bool E9::evalFilter (const Task& task)
{
if (_terms.size () == 0)
return true;
std::vector <Term> value_stack;
eval (task, value_stack);
// Coerce result to Boolean.
Term result = value_stack.back ();
value_stack.pop_back ();
return get_bool (coerce (result, "bool"));
}
////////////////////////////////////////////////////////////////////////////////
std::string E9::evalExpression (const Task& task)
{
if (_terms.size () == 0)
return "";
std::vector <Term> value_stack;
eval (task, value_stack);
return value_stack.back ()._value;
}
////////////////////////////////////////////////////////////////////////////////
void E9::eval (const Task& task, std::vector <Term>& value_stack)
{
// Case sensitivity is configurable.
bool case_sensitive = context.config.getBoolean ("search.case.sensitive");
std::vector <Term>::iterator arg;
for (arg = _terms.begin (); arg != _terms.end (); ++arg)
{
if (arg->_category == "op")
{
Term result;
// Unary operators.
if (arg->_raw == "!")
{
if (value_stack.size () < 1)
throw std::string ("There are no operands for the 'not' operator.");
Term right = value_stack.back ();
value_stack.pop_back ();
if (right._category == "dom")
{
right._value = context.dom.get (right._raw, task);
right._category = "string";
}
operator_not (result, right);
}
// Binary operators.
else
{
if (value_stack.size () < 2)
throw std::string ("There are not enough operands for the '") + arg->_raw + "' operator.";
Term right = value_stack.back ();
value_stack.pop_back ();
if (right._category == "dom")
{
right._value = context.dom.get (right._raw, task);
right._category = "string";
}
Term left = value_stack.back ();
value_stack.pop_back ();
if (left._category == "dom")
{
left._value = context.dom.get (left._raw, task);
left._category = "string";
}
if (arg->_raw == "and") operator_and (result, left, right);
else if (arg->_raw == "or") operator_or (result, left, right);
else if (arg->_raw == "xor") operator_xor (result, left, right);
else if (arg->_raw == "<") operator_lt (result, left, right);
else if (arg->_raw == "<=") operator_lte (result, left, right);
else if (arg->_raw == ">=") operator_gte (result, left, right);
else if (arg->_raw == ">") operator_gt (result, left, right);
else if (arg->_raw == "!=") operator_inequal (result, left, right, case_sensitive);
else if (arg->_raw == "=") operator_equal (result, left, right, case_sensitive);
else if (arg->_raw == "~") operator_match (result, left, right, case_sensitive);
else if (arg->_raw == "!~") operator_nomatch (result, left, right, case_sensitive);
else if (arg->_raw == "*") operator_multiply (result, left, right);
else if (arg->_raw == "/") operator_divide (result, left, right);
else if (arg->_raw == "+") operator_add (result, left, right);
else if (arg->_raw == "-") operator_subtract (result, left, right);
else
throw std::string ("Unsupported operator '") + arg->_raw + "'.";
}
// Store the result.
value_stack.push_back (result);
}
// Operand.
else
{
value_stack.push_back (*arg);
}
}
// Check for stack remnants.
if (value_stack.size () != 1)
throw std::string ("Error: Expression::eval found extra items on the stack.");
}
////////////////////////////////////////////////////////////////////////////////
bool E9::eval_match (Term& left, Term& right, bool case_sensitive)
{
if (right._category == "rx")
{
left = coerce (left, "string");
right = coerce (right, "string");
// Create a cached entry, if it does not already exist.
if (_regexes.find (right._value) == _regexes.end ())
_regexes[right._value] = RX (right._value, case_sensitive);
if (_regexes[right._value].match (left._value))
return true;
}
else
{
left = coerce (left, "string");
right = coerce (right, "string");
if (find (left._value, right._value, (bool) case_sensitive) != std::string::npos)
return true;
}
return false;
}
////////////////////////////////////////////////////////////////////////////////
void E9::operator_not (Term& result, Term& right)
{
// TODO This is not right.
result = Term (right._raw, coerce (right, "bool")._value, "bool");
std::cout << "# not " << right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
}
////////////////////////////////////////////////////////////////////////////////
void E9::operator_and (Term& result, Term& left, Term& right)
{
// Assume failure.
result._raw = result._value = "false";
result._category = "bool";
if (coerce (left, "bool")._value == "true" &&
coerce (right, "bool")._value == "true" )
{
result._raw = result._value = "true";
result._category = "bool";
}
/*
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " and "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
*/
}
////////////////////////////////////////////////////////////////////////////////
void E9::operator_or (Term& result, Term& left, Term& right)
{
// Assume failure.
result._raw = result._value = "false";
result._category = "bool";
if (coerce (left, "bool")._value == "true" ||
coerce (right, "bool")._value == "true" )
{
result._raw = result._value = "true";
result._category = "bool";
}
/*
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " or "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
*/
}
////////////////////////////////////////////////////////////////////////////////
void E9::operator_xor (Term& result, Term& left, Term& right)
{
// Assume failure.
result._raw = result._value = "false";
result._category = "bool";
bool bool_left = coerce (left, "bool")._value == "true";
bool bool_right = coerce (right, "bool")._value == "true";
if ((bool_left && !bool_right) ||
(!bool_left && bool_right))
{
result._raw = result._value = "true";
result._category = "bool";
}
/*
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " xor "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
*/
}
////////////////////////////////////////////////////////////////////////////////
// TODO Special handling for priority.
// if (left._string != "H" && right._string == "H") result = true;
// else if (left._string == "L" && right._string == "M") result = true;
// else if (left._string == "" && right._string != "") result = true;
void E9::operator_lt (Term& result, Term& left, Term& right)
{
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " < "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
}
////////////////////////////////////////////////////////////////////////////////
// TODO Special handling for priority.
// if (left._string == right._string ) result = true;
// else if ( right._string == "H") result = true;
// else if (left._string == "L" && right._string == "M") result = true;
// else if (left._string == "" ) result = true;
void E9::operator_lte (Term& result, Term& left, Term& right)
{
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " <= "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
}
////////////////////////////////////////////////////////////////////////////////
// TODO Special handling for priority.
// if (left._string == right._string ) result = true;
// else if (left._string == "H" ) result = true;
// else if (left._string == "M" && right._string == "L") result = true;
// else if ( right._string == "" ) result = true;
void E9::operator_gte (Term& result, Term& left, Term& right)
{
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " >= "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
}
////////////////////////////////////////////////////////////////////////////////
// TODO Special handling for priority.
// if (left._string == "H" && right._string != "H") result = true;
// else if (left._string == "M" && right._string == "L") result = true;
// else if (left._string != "" && right._string == "") result = true;
void E9::operator_gt (Term& result, Term& left, Term& right)
{
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " > "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
}
////////////////////////////////////////////////////////////////////////////////
void E9::operator_inequal (
Term& result,
Term& left,
Term& right,
bool case_sensitive)
{
operator_equal (result, left, right, case_sensitive);
if (result._raw == "false")
result._raw = result._value = "true";
else
result._raw = result._value = "false";
/*
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " != "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
*/
}
////////////////////////////////////////////////////////////////////////////////
// if (right._string.length () <= left._string.length ())
// result = compare (right._string,
// left._string.substr (0, right._string.length ()),
// (bool) case_sensitive);
// }
// else
// result = (left == right);
void E9::operator_equal (
Term& result,
Term& left,
Term& right,
bool case_sensitive)
{
// Assume failure.
result._raw = result._value = "false";
result._category = "bool";
// 'project' and 'recur' attributes are matched leftmost.
if (left._raw == "project" || left._raw == "recur")
{
coerce (left, "string");
coerce (right, "string");
if (right._value.length () <= left._value.length () &&
compare (right._value,
left._value.substr (0, right._value.length ()),
(bool) case_sensitive))
{
result._raw = result._value = "true";
result._category = "bool";
}
}
// Regular equality matching.
else
{
if (left._value == right._value)
{
result._raw = result._value = "true";
result._category = "bool";
}
}
/*
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " = "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
*/
}
////////////////////////////////////////////////////////////////////////////////
void E9::operator_match (
Term& result,
Term& left,
Term& right,
bool case_sensitive)
{
result._category = "bool";
if (eval_match (left, right, case_sensitive))
result._raw = result._value = "true";
else
result._raw = result._value = "false";
/*
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " ~ "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
*/
}
////////////////////////////////////////////////////////////////////////////////
// bool case_sensitive = context.config.getBoolean ("search.case.sensitive");
// bool result = !eval_match (left, right, case_sensitive);
//
// // Matches against description are really against either description,
// // annotations or project.
// // Short-circuit if match already failed.
// if (result && left._raw == "description")
// {
// // TODO check further.
// }
void E9::operator_nomatch (
Term& result,
Term& left,
Term& right,
bool case_sensitive)
{
result._category = "bool";
if (!eval_match (left, right, case_sensitive))
result._raw = result._value = "true";
else
result._raw = result._value = "false";
/*
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " !~ "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
*/
}
////////////////////////////////////////////////////////////////////////////////
void E9::operator_multiply (Term& result, Term& left, Term& right)
{
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " * "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
}
////////////////////////////////////////////////////////////////////////////////
void E9::operator_divide (Term& result, Term& left, Term& right)
{
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " / "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
}
////////////////////////////////////////////////////////////////////////////////
void E9::operator_add (Term& result, Term& left, Term& right)
{
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " + "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
}
////////////////////////////////////////////////////////////////////////////////
void E9::operator_subtract (Term& result, Term& left, Term& right)
{
std::cout << "# " << left._raw << "/" << left._value << "/" << left._category
<< " - "
<< right._raw << "/" << right._value << "/" << right._category
<< " --> "
<< result._raw << "/" << result._value << "/" << result._category
<< "\n";
}
////////////////////////////////////////////////////////////////////////////////
const Term E9::coerce (const Term& input, const std::string& type)
{
Term result;
if (type == "bool")
{
result._category = "bool";
result._value = get_bool (input) ? "true" : "false";
}
if (type == "string")
{
// TODO Convert date?
result._raw = input._raw;
result._value = input._value;
result._category = "string";
}
// TODO Date
// TODO Duration
return result;
}
////////////////////////////////////////////////////////////////////////////////
bool E9::get_bool (const Term& input)
{
std::string value = lowerCase (input._value);
if (value == "true" ||
value == "t" ||
value == "1" ||
value == "+" ||
value == "y" ||
value == "yes" ||
value == "on" ||
value == "enable" ||
value == "enabled")
return true;
return false;
}
////////////////////////////////////////////////////////////////////////////////
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