eval

Documentation

Overview

Package eval evaluates an expression provided in string form.

Index

• Constants
• func Evaluate(expression string) (expr.Expr, error)
• func NewLexer(input io.Reader) (chan tokens.Token, error)

Constants

const (
	UnbalancedParenthesesError evalError = iota
	MissingFactorError
	MissingArgumentError
	UnknownFunctionError
	TrailingTokensError
	UnknownError
)

Error values

Functions

func Evaluate

func Evaluate(expression string) (expr.Expr, error)

Evaluate evaluates an expression provided in string form.

func NewLexer

func NewLexer(input io.Reader) (chan tokens.Token, error)

NewLexer creates a new lexer to read from the provided reader and returns the channel to which it writes.