mirror of
https://github.com/golang/go
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5edc6aefed
A mapper is always uniquely tied to a file at a specific version, so just build it when we get a new *ast.File. We build the mapper using the *token.File associated with the particular *ast.File, which is why there is one per ParseGoHandle instead of FileHandle. Change-Id: Ida40981ef91f6133cdd07e9793337fcd67510fba Reviewed-on: https://go-review.googlesource.com/c/tools/+/194517 Run-TryBot: Rebecca Stambler <rstambler@golang.org> Reviewed-by: Ian Cottrell <iancottrell@google.com>
128 lines
2.8 KiB
Go
128 lines
2.8 KiB
Go
// Copyright 2018 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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// this file contains protocol<->span converters
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package protocol
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import (
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"fmt"
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"golang.org/x/tools/internal/span"
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errors "golang.org/x/xerrors"
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)
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type ColumnMapper struct {
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URI span.URI
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Converter *span.TokenConverter
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Content []byte
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}
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func NewURI(uri span.URI) string {
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return string(uri)
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}
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func (m *ColumnMapper) Location(s span.Span) (Location, error) {
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rng, err := m.Range(s)
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if err != nil {
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return Location{}, err
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}
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return Location{URI: NewURI(s.URI()), Range: rng}, nil
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}
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func (m *ColumnMapper) Range(s span.Span) (Range, error) {
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if span.CompareURI(m.URI, s.URI()) != 0 {
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return Range{}, errors.Errorf("column mapper is for file %q instead of %q", m.URI, s.URI())
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}
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s, err := s.WithAll(m.Converter)
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if err != nil {
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return Range{}, err
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}
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start, err := m.Position(s.Start())
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if err != nil {
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return Range{}, err
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}
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end, err := m.Position(s.End())
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if err != nil {
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return Range{}, err
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}
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return Range{Start: start, End: end}, nil
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}
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func (m *ColumnMapper) Position(p span.Point) (Position, error) {
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chr, err := span.ToUTF16Column(p, m.Content)
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if err != nil {
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return Position{}, err
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}
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return Position{
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Line: float64(p.Line() - 1),
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Character: float64(chr - 1),
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}, nil
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}
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func (m *ColumnMapper) Span(l Location) (span.Span, error) {
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return m.RangeSpan(l.Range)
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}
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func (m *ColumnMapper) RangeSpan(r Range) (span.Span, error) {
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start, err := m.Point(r.Start)
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if err != nil {
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return span.Span{}, err
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}
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end, err := m.Point(r.End)
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if err != nil {
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return span.Span{}, err
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}
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return span.New(m.URI, start, end).WithAll(m.Converter)
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}
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func (m *ColumnMapper) PointSpan(p Position) (span.Span, error) {
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start, err := m.Point(p)
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if err != nil {
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return span.Span{}, err
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}
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return span.New(m.URI, start, start).WithAll(m.Converter)
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}
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func (m *ColumnMapper) Point(p Position) (span.Point, error) {
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line := int(p.Line) + 1
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offset, err := m.Converter.ToOffset(line, 1)
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if err != nil {
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return span.Point{}, err
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}
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lineStart := span.NewPoint(line, 1, offset)
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return span.FromUTF16Column(lineStart, int(p.Character)+1, m.Content)
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}
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func IsPoint(r Range) bool {
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return r.Start.Line == r.End.Line && r.Start.Character == r.End.Character
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}
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func CompareRange(a, b Range) int {
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if r := ComparePosition(a.Start, b.Start); r != 0 {
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return r
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}
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return ComparePosition(a.End, b.End)
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}
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func ComparePosition(a, b Position) int {
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if a.Line < b.Line {
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return -1
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}
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if a.Line > b.Line {
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return 1
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}
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if a.Character < b.Character {
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return -1
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}
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if a.Character > b.Character {
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return 1
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}
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return 0
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}
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func (r Range) Format(f fmt.State, _ rune) {
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fmt.Fprintf(f, "%v:%v-%v:%v", r.Start.Line, r.Start.Character, r.End.Line, r.End.Character)
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}
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