mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-16 18:44:05 -08:00
55 lines
1.7 KiB
Go
55 lines
1.7 KiB
Go
|
// 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.
|
||
|
|
|
||
|
|
// posrange is used to report a position in query strings for error
|
||
|
|
// and warning messages.
|
||
|
|
package posrange
|
||
|
|
|
||
|
|
import "fmt"
|
||
|
|
|
||
|
|
// Pos is the position in a string.
|
||
|
|
// Negative numbers indicate undefined positions.
|
||
|
|
type Pos int
|
||
|
|
|
||
|
|
// PositionRange describes a position in the input string of the parser.
|
||
|
|
type PositionRange struct {
|
||
|
|
Start Pos
|
||
|
|
End Pos
|
||
|
|
}
|
||
|
|
|
||
|
|
// StartPosInput uses the query string to convert the PositionRange into a
|
||
|
|
// line:col string, indicating when this is not possible if the query is empty
|
||
|
|
// or the position is invalid. When this is used to convert ParseErr to a string,
|
||
|
|
// lineOffset is an additional line offset to be added, and is only used inside
|
||
|
|
// unit tests.
|
||
|
|
func (p PositionRange) StartPosInput(query string, lineOffset int) string {
|
||
|
|
if query == "" {
|
||
|
|
return "unknown position"
|
||
|
|
}
|
||
|
|
pos := int(p.Start)
|
||
|
|
if pos < 0 || pos > len(query) {
|
||
|
|
return "invalid position"
|
||
|
|
}
|
||
|
|
|
||
|
|
lastLineBreak := -1
|
||
|
|
line := lineOffset + 1
|
||
|
|
for i, c := range query[:pos] {
|
||
|
|
if c == '\n' {
|
||
|
|
lastLineBreak = i
|
||
|
|
line++
|
||
|
|
}
|
||
|
|
}
|
||
|
|
col := pos - lastLineBreak
|
||
|
|
return fmt.Sprintf("%d:%d", line, col)
|
||
|
|
}
|