Crate pupil 

Arithmetic expression evaluator

Simple usage:

// Create a basic environment with the default builtins
let mut env = pupil::BasicEnv::default();

// Evaluate expressions in this environment
let result = pupil::eval(&env, "2 + 3");
assert_eq!(result, Ok(5.0));

Structs

BasicEnv

Basic environment.

Error

Error structure.

Expr

Expression context.

Token

Token structure.

Enums

ErrorKind

Error kinds.

Operator

Supported operator types.

TokenKind

Token kinds.

Traits

Env

Environment interface.

Functions

eval

Evaluates and calculates the result in one step.

eval_tokens

Evaluates a list of tokens and calculates the result.

function

Looks up a native function by name.

tokenize

Creates an iterator over the tokens in a string.

Type Aliases

Function

Signature for native functions.

Value

Underlying type used for arithmetic.