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tokens.go
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tokens.go
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// Copyright 2020 The OPA Authors. All rights reserved.
// Use of this source code is governed by an Apache2
// license that can be found in the LICENSE file.
package tokens
// Token represents a single Rego source code token
// for use by the Parser.
type Token int
func (t Token) String() string {
if t < 0 || int(t) >= len(strings) {
return "unknown"
}
return strings[t]
}
// All tokens must be defined here
const (
Illegal Token = iota
EOF
Whitespace
Ident
Comment
Package
Import
As
Default
Else
Not
Some
With
Null
True
False
Number
String
LBrack
RBrack
LBrace
RBrace
LParen
RParen
Comma
Colon
Add
Sub
Mul
Quo
Rem
And
Or
Unify
Equal
Assign
Neq
Gt
Lt
Gte
Lte
Dot
Semicolon
)
var strings = [...]string{
Illegal: "illegal",
EOF: "eof",
Whitespace: "whitespace",
Comment: "comment",
Ident: "ident",
Package: "package",
Import: "import",
As: "as",
Default: "default",
Else: "else",
Not: "not",
Some: "some",
With: "with",
Null: "null",
True: "true",
False: "false",
Number: "number",
String: "string",
LBrack: "[",
RBrack: "]",
LBrace: "{",
RBrace: "}",
LParen: "(",
RParen: ")",
Comma: ",",
Colon: ":",
Add: "plus",
Sub: "minus",
Mul: "mul",
Quo: "div",
Rem: "rem",
And: "and",
Or: "or",
Unify: "eq",
Equal: "equal",
Assign: "assign",
Neq: "neq",
Gt: "gt",
Lt: "lt",
Gte: "gte",
Lte: "lte",
Dot: ".",
Semicolon: ";",
}
var keywords = map[string]Token{
"package": Package,
"import": Import,
"as": As,
"default": Default,
"else": Else,
"not": Not,
"some": Some,
"with": With,
"null": Null,
"true": True,
"false": False,
}
// Keyword will return a token for the passed in
// literal value. If the value is a Rego keyword
// then the appropriate token is returned. Everything
// else is an Ident.
func Keyword(lit string) Token {
if tok, ok := keywords[lit]; ok {
return tok
}
return Ident
}