mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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74 lines
1.9 KiB
Go
74 lines
1.9 KiB
Go
// Copyright 2018 Google LLC
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//
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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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package common
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import (
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"fmt"
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"strings"
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"unicode/utf8"
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"golang.org/x/text/width"
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)
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// Error type which references a location within source and a message.
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type Error struct {
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Location Location
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Message string
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}
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const (
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dot = "."
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ind = "^"
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// maxSnippetLength is the largest number of characters which can be rendered in an error message snippet.
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maxSnippetLength = 16384
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)
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var (
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wideDot = width.Widen.String(dot)
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wideInd = width.Widen.String(ind)
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)
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// ToDisplayString decorates the error message with the source location.
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func (e *Error) ToDisplayString(source Source) string {
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var result = fmt.Sprintf("ERROR: %s:%d:%d: %s",
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source.Description(),
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e.Location.Line(),
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e.Location.Column()+1, // add one to the 0-based column for display
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e.Message)
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if snippet, found := source.Snippet(e.Location.Line()); found && len(snippet) <= maxSnippetLength {
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snippet := strings.Replace(snippet, "\t", " ", -1)
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srcLine := "\n | " + snippet
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var bytes = []byte(snippet)
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var indLine = "\n | "
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for i := 0; i < e.Location.Column() && len(bytes) > 0; i++ {
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_, sz := utf8.DecodeRune(bytes)
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bytes = bytes[sz:]
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if sz > 1 {
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indLine += wideDot
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} else {
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indLine += dot
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}
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}
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if _, sz := utf8.DecodeRune(bytes); sz > 1 {
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indLine += wideInd
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} else {
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indLine += ind
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}
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result += srcLine + indLine
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}
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return result
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}
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