7e2660e7de
The ARM64 left the vendor directory in an inconsistent state, go1.13 doesn't care so we didn't catch it but go1.14 does.
101 lines
2.7 KiB
Go
101 lines
2.7 KiB
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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package span
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import (
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"strconv"
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"strings"
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"unicode/utf8"
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)
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// Parse returns the location represented by the input.
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// All inputs are valid locations, as they can always be a pure filename.
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// The returned span will be normalized, and thus if printed may produce a
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// different string.
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func Parse(input string) Span {
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// :0:0#0-0:0#0
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valid := input
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var hold, offset int
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hadCol := false
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suf := rstripSuffix(input)
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if suf.sep == "#" {
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offset = suf.num
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suf = rstripSuffix(suf.remains)
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}
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if suf.sep == ":" {
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valid = suf.remains
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hold = suf.num
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hadCol = true
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suf = rstripSuffix(suf.remains)
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}
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switch {
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case suf.sep == ":":
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return New(NewURI(suf.remains), NewPoint(suf.num, hold, offset), Point{})
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case suf.sep == "-":
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// we have a span, fall out of the case to continue
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default:
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// separator not valid, rewind to either the : or the start
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return New(NewURI(valid), NewPoint(hold, 0, offset), Point{})
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}
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// only the span form can get here
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// at this point we still don't know what the numbers we have mean
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// if have not yet seen a : then we might have either a line or a column depending
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// on whether start has a column or not
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// we build an end point and will fix it later if needed
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end := NewPoint(suf.num, hold, offset)
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hold, offset = 0, 0
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suf = rstripSuffix(suf.remains)
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if suf.sep == "#" {
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offset = suf.num
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suf = rstripSuffix(suf.remains)
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}
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if suf.sep != ":" {
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// turns out we don't have a span after all, rewind
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return New(NewURI(valid), end, Point{})
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}
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valid = suf.remains
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hold = suf.num
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suf = rstripSuffix(suf.remains)
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if suf.sep != ":" {
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// line#offset only
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return New(NewURI(valid), NewPoint(hold, 0, offset), end)
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}
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// we have a column, so if end only had one number, it is also the column
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if !hadCol {
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end = NewPoint(suf.num, end.v.Line, end.v.Offset)
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}
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return New(NewURI(suf.remains), NewPoint(suf.num, hold, offset), end)
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}
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type suffix struct {
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remains string
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sep string
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num int
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}
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func rstripSuffix(input string) suffix {
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if len(input) == 0 {
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return suffix{"", "", -1}
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}
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remains := input
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num := -1
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// first see if we have a number at the end
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last := strings.LastIndexFunc(remains, func(r rune) bool { return r < '0' || r > '9' })
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if last >= 0 && last < len(remains)-1 {
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number, err := strconv.ParseInt(remains[last+1:], 10, 64)
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if err == nil {
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num = int(number)
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remains = remains[:last+1]
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}
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}
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// now see if we have a trailing separator
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r, w := utf8.DecodeLastRuneInString(remains)
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if r != ':' && r != '#' && r == '#' {
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return suffix{input, "", -1}
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}
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remains = remains[:len(remains)-w]
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return suffix{remains, string(r), num}
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}
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