token.go

package polai

// Token represents a lexical token.
type Token int

const (
	// Special tokens

	ILLEGAL Token = iota
	EOF
	WHITESPC
	ERROR

	// Literals

	IDENT       // unknown identifier
	LONG        // 123 | -123
	DBLQUOTESTR // "...abc..."
	COMMENT     // // ...abc...

	ENTITY    // Namespace::"ID"
	ATTRIBUTE // entity.attribute
	RECORDKEY // {x: ...}
	SET       // [...]
	FUNCTION  // xyz()
	RECORD    // {...}

	ELSE_TRUE
	ELSE_FALSE
	THEN_TRUE_ELSE_TRUE
	THEN_TRUE_ELSE_FALSE
	THEN_FALSE_ELSE_TRUE
	THEN_FALSE_ELSE_FALSE
	THEN_TRUE_ELSE_ERROR
	THEN_FALSE_ELSE_ERROR
	THEN_ERROR_ELSE_TRUE
	THEN_ERROR_ELSE_FALSE

	// Extensions

	IP
	DECIMAL

	// Misc characters

	LEFT_PAREN  // (
	RIGHT_PAREN // )
	LEFT_SQB    // [
	RIGHT_SQB   // ]
	LEFT_BRACE  // {
	RIGHT_BRACE // }
	PERIOD      // .
	COMMA       // ,
	SEMICOLON   // ;
	EXCLAMATION // !
	LT          // <
	GT          // >
	DASH        // -
	PLUS        // +
	MULTIPLIER  // *
	COLON       // :

	// Misc

	NAMESPACE  // ::
	EQUALITY   // ==
	INEQUALITY // !=
	LTE        // <=
	GTE        // >=
	AND        // &&
	OR         // ||

	// Keywords

	PERMIT
	FORBID
	WHEN
	UNLESS
	TRUE
	FALSE
	IF
	THEN
	ELSE
	IN
	LIKE
	HAS
	PRINCIPAL
	ACTION
	RESOURCE
	CONTEXT
)