token: remove Precedence, IsKeyword, Lookup
diff --git a/token/token.go b/token/token.go
index f5ea2b2..96e4d5c 100644
--- a/token/token.go
+++ b/token/token.go
@@ -67,56 +67,6 @@
return s
}
-// A set of constants for precedence-based expression parsing.
-// Non-operators have lowest precedence, followed by operators
-// starting with precedence 1 up to unary operators. The highest
-// precedence corresponds serves as "catch-all" precedence for
-// selector, indexing, and other operator and delimiter tokens.
-//
-const (
- LowestPrec = 0 // non-operators
- UnaryPrec = 6
- HighestPrec = 7
-)
-
-// Precedence returns the operator precedence of the binary
-// operator op. If op is not a binary operator, the result
-// is LowestPrecedence.
-//
-func (op Token) Precedence() int {
- switch op {
- case LOR:
- return 1
- case LAND:
- return 2
- case EQL, NEQ, LSS, LEQ, GTR, GEQ:
- return 3
- case ADD, SUB, OR, XOR:
- return 4
- case MUL, QUO, REM, SHL, SHR, AND, AND_NOT:
- return 5
- }
- return LowestPrec
-}
-
-var keywords map[string]Token
-
-func init() {
- keywords = make(map[string]Token)
- for i := keyword_beg + 1; i < keyword_end; i++ {
- keywords[tokens[i]] = i
- }
-}
-
-// Lookup maps an identifier to its keyword token or IDENT (if not a keyword).
-//
-func Lookup(ident string) Token {
- if tok, is_keyword := keywords[ident]; is_keyword {
- return tok
- }
- return IDENT
-}
-
// Predicates
// IsLiteral returns true for tokens corresponding to identifiers
@@ -128,8 +78,3 @@
// delimiters; it returns false otherwise.
//
func (tok Token) IsOperator() bool { return operator_beg < tok && tok < operator_end }
-
-// IsKeyword returns true for tokens corresponding to keywords;
-// it returns false otherwise.
-//
-func (tok Token) IsKeyword() bool { return keyword_beg < tok && tok < keyword_end }
