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56a854fe14
* update github.com/docker/cli * update github.com/docker/distribution * update github.com/docker/docker * update github.com/gin-gonic/gin * update github.com/golang-jwt/jwt/v4 * update github.com/golangci/golangci-lint * update github.com/gorilla/securecookie * update github.com/mattn/go-sqlite3 * update github.com/moby/moby * update github.com/prometheus/client_golang * update github.com/xanzy/go-gitlab
39 lines
888 B
Go
39 lines
888 B
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build !go1.12
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package span
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import (
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"go/token"
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)
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// lineStart is the pre-Go 1.12 version of (*token.File).LineStart. For Go
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// versions <= 1.11, we borrow logic from the analysisutil package.
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// TODO(rstambler): Delete this file when we no longer support Go 1.11.
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func lineStart(f *token.File, line int) token.Pos {
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// Use binary search to find the start offset of this line.
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min := 0 // inclusive
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max := f.Size() // exclusive
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for {
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offset := (min + max) / 2
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pos := f.Pos(offset)
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posn := f.Position(pos)
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if posn.Line == line {
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return pos - (token.Pos(posn.Column) - 1)
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}
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if min+1 >= max {
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return token.NoPos
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}
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if posn.Line < line {
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min = offset
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} else {
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max = offset
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}
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}
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}
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