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README
evaler
https://github.com/soniah/evaler
Package evaler implements a simple floating point arithmetic expression evaluator.
Evaler uses Dijkstra's Shunting Yard algorithm to convert an
infix expression to postfix/RPN format, then evaluates
the RPN expression. The implementation is adapted from a Java implementation. The results
are returned as a *big.Rat
.
Usage
result, err := evaler.Eval("1+2")
Operators
The operators supported are:
+  * / ^ ** () < > <= >= == !=
(^
and **
are both exponent operators)
Logical operators like <
(less than) or >
(greater than) get lowest precedence,
all other precedence is as expected 
BODMAS.
Logical tests like <
and >
tests will evaluate to 0.0 for false and 1.0
for true, allowing expressions like:
3 * (1 < 2) # returns 3.0
3 * (1 > 2) # returns 0.0
Minus implements both binary and unary operations.
See evaler_test.go
for more examples of using operators.
Trigonometric Operators
The trigonometric operators supported are:
sin, cos, tan, ln, arcsin, arccos, arctan
For example:
cos(1)
sin(21)
sin(1)+2**2
See evaler_test.go
for more examples of using trigonometric operators.
Variables
EvalWithVariables()
allows variables to be passed into expressions,
for example evaluate "x + 1"
, where x=5
.
See evaler_test.go
for more examples of using variables.
Issues
The math/big
library doesn't have an exponent function **
and implenting one
for big.Rat
numbers is nontrivial. As a work around, arguments are converted
to float64's, the calculation is done using the math.Pow()
function, the
result is converted to a big.Rat
and placed back on the stack.
 floating point numbers missing leading digits (like
".5 * 2"
) are failing  PR's welcome
Documentation
http://godoc.org/github.com/soniah/evaler
There are also a number of utility functions e.g. BigratToFloat()
,
BigratToInt()
that may be useful when working with evaler.
Contributions
Contributions are welcome.
If you've never contributed to a Go project before here is an example workflow.
 fork this repo on the GitHub webpage
go get github.com/soniah/evaler
cd $GOPATH/src/github.com/soniah/evaler
git remote rename origin upstream
git remote add origin git@github.com:<yourgithubusername>/evaler.git
git checkout b development
git push u origin development
(setup where you push to, check it works)
Author
Sonia Hamilton sonia@snowfrog.net
Dem Waffles demwaffles@server.fake  trigonometric operators
License
Modified BSD License (BSD3)
Links
[1] http://en.wikipedia.org/wiki/Shuntingyard_algorithm
[2] http://en.wikipedia.org/wiki/Reverse_Polish_notation
*Note that all licence references and agreements mentioned in the evaler README section above
are relevant to that project's source code only.