calculator

This is a simple math expression evaluator written in Clojure.

With Java and Leiningen:

$ lein run "2 + (5 * 6 + 10)"
42.0

With Babashka or nbb:

$ bb --classpath src -m calculator.core "2 + (5 * 6 + 10)"
42.0
$ npx nbb --classpath src --main calculator.core "2 + (5 * 6 + 10)"
42.0

With JavaScript and Node.js:

$ npm install
$ npm run build
$ npm run calc "2 + (5 * 6 + 10)"
42

Supported features:

• Integer and floating-point literals
• Additions, subtractions, multiplications, divisions
• Parenthesized sub-expressions

TODO:

• Floating-point literals with exponents (e.g. 6.022E23)
• Modulus/remainder
• Trigonometric functions
• More functions

Create a native executable with native-image from GraalVM:

$ lein uberjar
Compiling calculator.core
Compiling calculator.evaluator
Compiling calculator.lexer
Compiling calculator.parser
$ native-image --no-fallback -jar target/uberjar/calculator-0.1.0-SNAPSHOT-standalone.jar calc
42.0
GraalVM Native Image: Generating 'calc' (executable)...
[1/7] Initializing...
 Version info: 'GraalVM 22.1.0 Java 11 CE'
 C compiler: gcc (linux, x86_64, 9.4.0)
 Garbage collector: Serial GC
[2/7] Performing analysis...
[3/7] Building universe...
[4/7] Parsing methods...
[5/7] Inlining methods...
[6/7] Compiling methods...
[7/7] Creating image...
Finished generating 'calc' in 12.8s.
$ ./calc "2 + (5 * 6 + 10)"
42.0