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// Copyright 2023 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package parse
import (
"errors"
"fmt"
"strconv"
"unicode/utf8"
)
type tokenKind int
const (
tokenEOF tokenKind = iota
tokenOpenBrace
tokenCloseBrace
tokenComma
tokenEquals
tokenNotEquals
tokenMatches
tokenNotMatches
tokenQuoted
tokenUnquoted
)
func (k tokenKind) String() string {
switch k {
case tokenOpenBrace:
return "OpenBrace"
case tokenCloseBrace:
return "CloseBrace"
case tokenComma:
return "Comma"
case tokenEquals:
return "Equals"
case tokenNotEquals:
return "NotEquals"
case tokenMatches:
return "Matches"
case tokenNotMatches:
return "NotMatches"
case tokenQuoted:
return "Quoted"
case tokenUnquoted:
return "Unquoted"
default:
return "EOF"
}
}
type token struct {
kind tokenKind
value string
position
}
// isEOF returns true if the token is an end of file token.
func (t token) isEOF() bool {
return t.kind == tokenEOF
}
// isOneOf returns true if the token is one of the specified kinds.
func (t token) isOneOf(kinds ...tokenKind) bool {
for _, k := range kinds {
if k == t.kind {
return true
}
}
return false
}
// unquote the value in token. If unquoted returns it unmodified.
func (t token) unquote() (string, error) {
if t.kind == tokenQuoted {
unquoted, err := strconv.Unquote(t.value)
if err != nil {
return "", err
}
if !utf8.ValidString(unquoted) {
return "", errors.New("quoted string contains invalid UTF-8 code points")
}
return unquoted, nil
}
return t.value, nil
}
func (t token) String() string {
return fmt.Sprintf("(%s) '%s'", t.kind, t.value)
}
type position struct {
offsetStart int // The start position in the input.
offsetEnd int // The end position in the input.
columnStart int // The column number.
columnEnd int // The end of the column.
}