parser

func Assignexpr ¶

func Assignexpr(s *sc.Scanner, tok1 rune) (t Term, tok rune, ok bool)

<expression> | <variable> ':=' <exspression>

func Err ¶

func Err(s *sc.Scanner, str string)

func Err1 ¶

func Err1(s *sc.Scanner, format string, a ...interface{})

func Factor_name ¶

func Factor_name(name string, s *sc.Scanner, tok1 rune) (t Term, tok rune, ok bool)

<bi_0 name> | <name>'(”)' | <name> '(' <expression> [',' <expression>]0..n ')'

func ReadString ¶

func ReadString(src string) (result Term, ok bool)

func Tok2str ¶

func Tok2str(tok rune) string