ofxExpression

API

ofxExpression

• bool parsePN(string PolishNotation)

Parse expression.

• float eval(float x = 0.0f, float y = 0.0f, float z = 0.0f)

Evaluate expression

Expression (Polish Notation)

definition

<expr>      ::= <constant> | <var> | <unary_op> <space> <expr> | <binary_op> <space> <expr>
<space>     ::= " "
<constant>  ::= ["-"] <digits> ["."] [<digits>]
<digits>    ::= <digit> | <digit> <digits>
<digit>     ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
<var>       ::= "x" | "y" | "z"
<unary_op>  ::= "sin" | "cos" | "tan" | "asin" | "acos" | "atan" | "abs" | "log" | "sqrt" | "floor" | "round" | "ceil"
<binary_op> ::= "add" | "+" | "sub" | "-" | "mul" | "*" | "div" | "/" | "pow"

example

	x
	3
	-1
	-2.01
    sin x
    sin * 3.141592 x
    add sin x cos y

Update history

2015/02/22 ver 0.01 release

License

MIT License.

Author

• ISHII 2bit [bufferRenaiss co., ltd.]
• ishii[at]buffer-renaiss.com

At the last

Please create new issue, if there is a problem. And please throw pull request, if you have a cool idea!!