mirror of
https://github.com/GothenburgBitFactory/taskwarrior.git
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Expressions
- Simplified ::eval. - Added standard operand handling. - Added type information to the value_stack.
This commit is contained in:
Paul Beckingham
parent
c77c6f172f
commit
c57f880be7
1 changed files with 53 additions and 145 deletions
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@ -71,89 +71,75 @@ bool Expression::eval (Task& task)
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// There are elements in the filter, so the expression must be evaluated
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// against each task.
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std::vector <Variant> value_stack;
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std::vector <std::pair <Variant, std::string> > value_stack;
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// TODO Build an on-demand regex cache.
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std::vector <std::pair <std::string, std::string> >::iterator arg;
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for (arg = _args.begin (); arg != _args.end (); ++arg)
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{
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if (arg->second == "op")
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{
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// TODO Need helpers that pop, and error out if necessary.
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// Handle the unary operator first.
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if (arg->first == "!")
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{
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if (value_stack.size () < 1)
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throw std::string ("Error: Insufficient operands for '!' operator.");
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std::string right_type = value_stack.back ().second;
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Variant right (value_stack.back ().first);
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value_stack.pop_back ();
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right = ! right;
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value_stack.push_back (std::make_pair (right, ""));
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continue; // This only occurs here.
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}
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands for '") + arg->first + "' operator.";
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// Pop the binary operands first.
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std::string right_type = value_stack.back ().second;
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Variant right (value_stack.back ().first);
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value_stack.pop_back ();
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std::string left_type = value_stack.back ().second;
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Variant left (value_stack.back ().first);
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value_stack.pop_back ();
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// Now hte binary operators.
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if (arg->first == "and")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = left && right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == "xor")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = (left && !right) || (!left && right);
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == "or")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = left || right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == "<=")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = left <= right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == ">=")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = left >= right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == "!~")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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// TODO
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/*
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if left == "description" then it really means description or annotations or project.
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@ -163,146 +149,68 @@ bool Expression::eval (Task& task)
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else if (arg->first == "!=")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = left != right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == "=")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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context.debug ("eval left=" + left.format ());
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context.debug ("eval right=" + right.format ());
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left = left == right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == ">")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = left > right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == "~")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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// TODO
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// TODO We need to compare right against description, all annotations and project.
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// TODO Does that mean we need the original lvalue intact, and not a DOM subst?
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/*
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if left == "description" then it really means description or annotations or project.
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if left == "tags" then it just means tags.
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*/
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}
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else if (arg->first == "!")
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{
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if (value_stack.size () < 1)
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throw std::string ("Error: Insufficient operands.");
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = ! left;
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value_stack.push_back (left);
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}
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else if (arg->first == "*")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = left * right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == "/")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = left / right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == "%")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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// TODO Implement modulus.
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}
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else if (arg->first == "+")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = left + right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == "-")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = left - right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else if (arg->first == "<")
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{
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if (value_stack.size () < 2)
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throw std::string ("Error: Insufficient operands.");
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Variant right (value_stack.back ());
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value_stack.pop_back ();
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Variant left (value_stack.back ());
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value_stack.pop_back ();
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left = left < right;
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value_stack.push_back (left);
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value_stack.push_back (std::make_pair (left, ""));
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}
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else
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@ -313,18 +221,18 @@ bool Expression::eval (Task& task)
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else
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{
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if (arg->second == "lvalue")
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value_stack.push_back (Variant (context.dom.get (arg->first, task)));
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value_stack.push_back (std::make_pair (Variant (context.dom.get (arg->first, task)), ""));
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else if (arg->second == "int")
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value_stack.push_back (Variant ((int) strtol (arg->first.c_str (), NULL, 10)));
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value_stack.push_back (std::make_pair (Variant ((int) strtol (arg->first.c_str (), NULL, 10)), ""));
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else if (arg->second == "number")
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value_stack.push_back (Variant (strtod (arg->first.c_str (), NULL)));
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value_stack.push_back (std::make_pair (Variant (strtod (arg->first.c_str (), NULL)), ""));
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else if (arg->second == "rvalue" ||
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arg->second == "string" ||
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arg->second == "rx")
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value_stack.push_back (Variant (arg->first));
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value_stack.push_back (std::make_pair (Variant (unquoteText (arg->first)), ""));
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else
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throw std::string ("Error: Expression::eval unrecognized operand '") + + "'.";
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@ -332,7 +240,7 @@ bool Expression::eval (Task& task)
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}
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// Coerce stack element to boolean.
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Variant result (value_stack.back ());
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Variant result (value_stack.back ().first);
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//context.debug ("eval result=" + result.format ());
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value_stack.pop_back ();
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bool pass_fail = result.boolean ();
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