1 ////////////////////////////////////////////////////////////////////////////////
2 //
3 // Copyright 2006 - 2021, Tomas Babej, Paul Beckingham, Federico Hernandez.
4 //
5 // Permission is hereby granted, free of charge, to any person obtaining a copy
6 // of this software and associated documentation files (the "Software"), to deal
7 // in the Software without restriction, including without limitation the rights
8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 // copies of the Software, and to permit persons to whom the Software is
10 // furnished to do so, subject to the following conditions:
11 //
12 // The above copyright notice and this permission notice shall be included
13 // in all copies or substantial portions of the Software.
14 //
15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 // SOFTWARE.
22 //
23 // https://www.opensource.org/licenses/mit-license.php
24 //
25 ////////////////////////////////////////////////////////////////////////////////
26
27 #include <Context.h>
28 #include <CmdCalc.h>
29 #include <Filter.h>
30 #include <Eval.h>
31
32 ////////////////////////////////////////////////////////////////////////////////
CmdCalc()33 CmdCalc::CmdCalc ()
34 {
35 _keyword = "calc";
36 _usage = "task calc <expression>";
37 _description = "Calculator";
38 _read_only = true;
39 _displays_id = false;
40 _needs_gc = false;
41 _uses_context = false;
42 _accepts_filter = false;
43 _accepts_modifications = false;
44 _accepts_miscellaneous = true;
45 _category = Command::Category::misc;
46 }
47
48 ////////////////////////////////////////////////////////////////////////////////
execute(std::string & output)49 int CmdCalc::execute (std::string& output)
50 {
51 // Configurable infix/postfix
52 bool infix {true};
53 if (Context::getContext ().config.get ("expressions") == "postfix")
54 infix = false;
55
56 // Create an evaluator with DOM access.
57 Eval e;
58 e.addSource (domSource);
59 e.debug (Context::getContext ().config.getBoolean ("debug"));
60
61 // Compile all the args into one expression.
62 std::string expression;
63 for (const auto& word : Context::getContext ().cli2.getWords ())
64 expression += word + ' ';
65
66 // Evaluate according to preference.
67 Variant result;
68 if (infix)
69 e.evaluateInfixExpression (expression, result);
70 else
71 e.evaluatePostfixExpression (expression, result);
72
73 output = (std::string) result + '\n';
74 return 0;
75 }
76
77 ////////////////////////////////////////////////////////////////////////////////
78