55 lines
1.7 KiB
Go
55 lines
1.7 KiB
Go
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// Copyright 2023 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// posrange is used to report a position in query strings for error
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// and warning messages.
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package posrange
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import "fmt"
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// Pos is the position in a string.
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// Negative numbers indicate undefined positions.
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type Pos int
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// PositionRange describes a position in the input string of the parser.
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type PositionRange struct {
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Start Pos
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End Pos
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}
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// StartPosInput uses the query string to convert the PositionRange into a
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// line:col string, indicating when this is not possible if the query is empty
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// or the position is invalid. When this is used to convert ParseErr to a string,
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// lineOffset is an additional line offset to be added, and is only used inside
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// unit tests.
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func (p PositionRange) StartPosInput(query string, lineOffset int) string {
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if query == "" {
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return "unknown position"
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}
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pos := int(p.Start)
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if pos < 0 || pos > len(query) {
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return "invalid position"
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}
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lastLineBreak := -1
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line := lineOffset + 1
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for i, c := range query[:pos] {
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if c == '\n' {
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lastLineBreak = i
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line++
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}
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}
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col := pos - lastLineBreak
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return fmt.Sprintf("%d:%d", line, col)
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}
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