Calculator

A simple math expression evaluator written in rust.

Usage

cargo run

Functions

• abs
• ceil
• floor
• round
• sign
• sin
• cos
• tan
• asin
• acos
• atan
• ln
• log
• sqrt
• max
• min
• clamp
• clamp01

Constants

• pi
• e

Example

> 1 + 2 * (2 ^ 10) + ceil(10 / 3) + sin(2 * pi)

Grammar

expression: addition
addition: multiplication ('+' | '-' multiplication)*
multiplication: unary ('*' | '/' | '%' | '^' unary)*
unary: '-'? parentheses
parentheses: '(' expression ')' | atom
atom: number | call
number: [0-9]+ ('.' [0-9]+)?
call: identifier ('(' arguments ')')?
identifier: [a-zA-Z][a-zA-Z0-9]*
arguments: expression (',' expression)*