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internal/span: end of file is now last line +1

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We already accepted it as a valid input, but for output we still produced
last_line,last_column+1
Also add package docs and improve error messages

Change-Id: I017aa326e8392134e67e8fabec47e750c8055454
Reviewed-on: https://go-review.googlesource.com/c/tools/+/199641
Run-TryBot: Ian Cottrell <iancottrell@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
This commit is contained in:
Ian Cottrell 2019-10-07 13:52:07 -04:00
parent 79dbfd6c86
commit 6536af71d9
3 changed files with 18 additions and 7 deletions
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5
internal/span/span.go
View File

@ -2,6 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package span contains support for representing with positions and ranges in
// text files.
package span
import (
@ -34,6 +36,9 @@ type point struct {
Offset int `json:"offset"`
}
// Invalid is a span that reports false from IsValid
var Invalid = Span{v: span{Start: invalidPoint.v, End: invalidPoint.v}}
var invalidPoint = Point{v: point{Line: 0, Column: 0, Offset: -1}}
// Converter is the interface to an object that can convert between line:column

11
internal/span/token.go
View File

@ -102,10 +102,10 @@ func (s Span) Range(converter *TokenConverter) (Range, error) {
// go/token will panic if the offset is larger than the file's size,
// so check here to avoid panicking.
if s.Start().Offset() > converter.file.Size() {
return Range{}, fmt.Errorf("start offset %v is past the end of the file", s.Start())
return Range{}, fmt.Errorf("start offset %v is past the end of the file %v", s.Start(), converter.file.Size())
}
if s.End().Offset() > converter.file.Size() {
return Range{}, fmt.Errorf("end offset %v is past the end of the file", s.End())
return Range{}, fmt.Errorf("end offset %v is past the end of the file %v", s.End(), converter.file.Size())
}
return Range{
FileSet: converter.fset,
@ -116,10 +116,13 @@ func (s Span) Range(converter *TokenConverter) (Range, error) {
func (l *TokenConverter) ToPosition(offset int) (int, int, error) {
if offset > l.file.Size() {
return 0, 0, fmt.Errorf("offset %v is past the end of the file", offset)
return 0, 0, fmt.Errorf("offset %v is past the end of the file %v", offset, l.file.Size())
}
pos := l.file.Pos(offset)
p := l.fset.Position(pos)
if offset == l.file.Size() {
return p.Line + 1, 1, nil
}
return p.Line, p.Column, nil
}
@ -129,7 +132,7 @@ func (l *TokenConverter) ToOffset(line, col int) (int, error) {
}
lineMax := l.file.LineCount() + 1
if line > lineMax {
return -1, fmt.Errorf("line is beyond end of file")
return -1, fmt.Errorf("line is beyond end of file %v", lineMax)
} else if line == lineMax {
if col > 1 {
return -1, fmt.Errorf("column is beyond end of file")

9
internal/span/token_test.go
View File

@ -24,14 +24,17 @@ package test
//
//
// file b.go
package test
`)},
package test`)},
{"/c.go", []byte(`
// file c.go
package test`)},
}
var tokenTests = []span.Span{
span.New(span.FileURI("/a.go"), span.NewPoint(1, 1, 0), span.Point{}),
span.New(span.FileURI("/a.go"), span.NewPoint(3, 7, 20), span.NewPoint(3, 7, 20)),
span.New(span.FileURI("/b.go"), span.NewPoint(4, 9, 15), span.NewPoint(4, 13, 19)),
span.New(span.FileURI("/c.go"), span.NewPoint(4, 1, 26), span.Point{}),
}
func TestToken(t *testing.T) {
@ -70,6 +73,6 @@ func checkToken(t *testing.T, c *span.TokenConverter, in, expect span.Span) {
expected := fmt.Sprintf("%+v", expect)
got := fmt.Sprintf("%+v", gotLoc)
if expected != got {
t.Errorf("Expected %q got %q", expected, got)
t.Errorf("For %v expected %q got %q", in, expected, got)
}
}