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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cmd
import (
"strconv"
"strings"
"unicode/utf8"
"cuelang.org/go/internal/golangorgx/gopls/protocol"
)
// parseSpan returns the location represented by the input.
// Only file paths are accepted, not URIs.
// The returned span will be normalized, and thus if printed may produce a
// different string.
func parseSpan(input string) span {
uri := protocol.URIFromPath
// :0:0#0-0:0#0
valid := input
var hold, offset int
hadCol := false
suf := rstripSuffix(input)
if suf.sep == "#" {
offset = suf.num
suf = rstripSuffix(suf.remains)
}
if suf.sep == ":" {
valid = suf.remains
hold = suf.num
hadCol = true
suf = rstripSuffix(suf.remains)
}
switch {
case suf.sep == ":":
return newSpan(uri(suf.remains), newPoint(suf.num, hold, offset), point{})
case suf.sep == "-":
// we have a span, fall out of the case to continue
default:
// separator not valid, rewind to either the : or the start
return newSpan(uri(valid), newPoint(hold, 0, offset), point{})
}
// only the span form can get here
// at this point we still don't know what the numbers we have mean
// if have not yet seen a : then we might have either a line or a column depending
// on whether start has a column or not
// we build an end point and will fix it later if needed
end := newPoint(suf.num, hold, offset)
hold, offset = 0, 0
suf = rstripSuffix(suf.remains)
if suf.sep == "#" {
offset = suf.num
suf = rstripSuffix(suf.remains)
}
if suf.sep != ":" {
// turns out we don't have a span after all, rewind
return newSpan(uri(valid), end, point{})
}
valid = suf.remains
hold = suf.num
suf = rstripSuffix(suf.remains)
if suf.sep != ":" {
// line#offset only
return newSpan(uri(valid), newPoint(hold, 0, offset), end)
}
// we have a column, so if end only had one number, it is also the column
if !hadCol {
end = newPoint(suf.num, end.v.Line, end.v.Offset)
}
return newSpan(uri(suf.remains), newPoint(suf.num, hold, offset), end)
}
type suffix struct {
remains string
sep string
num int
}
func rstripSuffix(input string) suffix {
if len(input) == 0 {
return suffix{"", "", -1}
}
remains := input
// Remove optional trailing decimal number.
num := -1
last := strings.LastIndexFunc(remains, func(r rune) bool { return r < '0' || r > '9' })
if last >= 0 && last < len(remains)-1 {
number, err := strconv.ParseInt(remains[last+1:], 10, 64)
if err == nil {
num = int(number)
remains = remains[:last+1]
}
}
// now see if we have a trailing separator
r, w := utf8.DecodeLastRuneInString(remains)
// TODO(adonovan): this condition is clearly wrong. Should the third byte be '-'?
if r != ':' && r != '#' && r == '#' {
return suffix{input, "", -1}
}
remains = remains[:len(remains)-w]
return suffix{remains, string(r), num}
}
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