lisp

Documentation

Index

• func Eval(x Expression, env Environment) (Expression, Environment, error)
• func Interactive(prompt string) error
• type Environment
  • func StdEnv() Environment
• type Expression
  • func Parse(program string) (Expression, error)

Functions

func Eval

func Eval(x Expression, env Environment) (Expression, Environment, error)

Eval evaluates a Lisp Expression in an Environment.

func Interactive

func Interactive(prompt string) error

Interactive launches an interactive lisp prompt.

Types

type Environment

type Environment struct {
	// contains filtered or unexported fields
}

An Environment binds variable names to their values.

func StdEnv

func StdEnv() Environment

StdEnv returns an Environment which binds variable names for the standard, primitive values (like `+` and `-`).

type Expression

type Expression interface {

	// String returns a readable Lisp string representing the Expression.
	String() string
}

An Expression is a List or an Atom. Lisp proceeds by evaluating Expressions.

func Parse

func Parse(program string) (Expression, error)

Parse tries to read a string into a Lisp