sexp

Documentation

Index

• func ReferencedVars(s Sexp) []string
• type Context
• type List
  • func (l List) String() string
• type QString
• type Sexp
  • func Eval(ctx *Context, s Sexp) (Sexp, error)
  • func Parse(s string) (Sexp, error)
  • func (s Sexp) Dump(i int)
  • func (s Sexp) String() string

Functions

func ReferencedVars

func ReferencedVars(s Sexp) []string

Types

type Context

type Context struct {
	Funcs map[string]func([]interface{}) (Sexp, error)
	Vars  map[string]Sexp
}

var Builtin Context = Context{
	Funcs: map[string]func([]interface{}) (Sexp, error){
		"format": format,
	},
	Vars: map[string]Sexp{
		"xxxx": {"xxx"},
	},
}

type List

type List []Sexp

func (List) String

func (l List) String() string

type QString

type QString string

type Sexp

type Sexp struct {
	I interface{}
}

dynamic types for i are string, qString, int, float64, list, and error.

func Eval

func Eval(ctx *Context, s Sexp) (Sexp, error)

func Parse

func Parse(s string) (Sexp, error)

Parse parses a string into a Go representation of an s-expression.

Quoted strings go from one " to the next. There is no escape character, all characters except " are valid.

Otherwise atoms are any string of characters between any of '(', ')', '"', or white space characters. If the atom parses as a Go int type using strconv.Atoi, it is taken as int; if it parses as a Go float64 type using strconv.ParseFloat, it is taken as float64; otherwise it is taken as an unquoted string.

Unmatched (, ), or " are errors. An empty or all whitespace input string is an error. Left over text after the sexp is an error.

An empty list is a valid sexp, but there is no nil, no cons, no dot.

func (Sexp) Dump

func (s Sexp) Dump(i int)

func (Sexp) String

func (s Sexp) String() string