token

Documentation

Overview

Package token defines constants representing the lexical tokens.

Index

• Constants
• type Token
  • func (t Token) Precedence() int
  • func (t Token) String() string

Constants

const (
	LowestPrec  = 0 // non-operators
	HighestPrec = 3
)

A set of constants for precedence-based expression parsing. Non-operators have lowest precedence.

Types

type Token

type Token int

const (
	ILLEGAL Token = iota
	EOF

	STRING // "text"
	INT    // 123
	IDENT  // vars

	ADD  // +
	CALL // }}:\n

	LPAREN    // (
	RPAREN    // )
	LBRACK    // [
	RBRACK    // ]
	LDBRACE   // {{
	RDBRACE   // }}
	COMMA     // ,
	PERIOD    // .
	LARROW    // <-
	LINEBREAK // end of a larrow expression argument
)

func (Token) Precedence

func (t Token) Precedence() int

Precedence returns the operator precedence of the binary operator op. If op is not a binary operator, the result is LowestPrecedence.

func (Token) String

func (t Token) String() string

String returns t as string.