.gitignore added

[dotfiles/.git] / .config / coc / extensions / coc-go-data / tools / pkg / mod / golang.org / x / tools@v0.1.1-0.20210319172145-bda8f5cee399 / cmd / guru / pos.go

diff --git a/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.1.1-0.20210319172145-bda8f5cee399/cmd/guru/pos.go b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.1.1-0.20210319172145-bda8f5cee399/cmd/guru/pos.go
new file mode 100644 (file)
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--- /dev/null
+++ b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.1.1-0.20210319172145-bda8f5cee399/cmd/guru/pos.go
@@ -0,0 +1,142 @@
+// Copyright 2013 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 main
+
+// This file defines utilities for working with file positions.
+
+import (
+       "fmt"
+       "go/build"
+       "go/parser"
+       "go/token"
+       "os"
+       "path/filepath"
+       "strconv"
+       "strings"
+
+       "golang.org/x/tools/go/ast/astutil"
+       "golang.org/x/tools/go/buildutil"
+)
+
+// parseOctothorpDecimal returns the numeric value if s matches "#%d",
+// otherwise -1.
+func parseOctothorpDecimal(s string) int {
+       if s != "" && s[0] == '#' {
+               if s, err := strconv.ParseInt(s[1:], 10, 32); err == nil {
+                       return int(s)
+               }
+       }
+       return -1
+}
+
+// parsePos parses a string of the form "file:pos" or
+// file:start,end" where pos, start, end match #%d and represent byte
+// offsets, and returns its components.
+//
+// (Numbers without a '#' prefix are reserved for future use,
+// e.g. to indicate line/column positions.)
+//
+func parsePos(pos string) (filename string, startOffset, endOffset int, err error) {
+       if pos == "" {
+               err = fmt.Errorf("no source position specified")
+               return
+       }
+
+       colon := strings.LastIndex(pos, ":")
+       if colon < 0 {
+               err = fmt.Errorf("bad position syntax %q", pos)
+               return
+       }
+       filename, offset := pos[:colon], pos[colon+1:]
+       startOffset = -1
+       endOffset = -1
+       if comma := strings.Index(offset, ","); comma < 0 {
+               // e.g. "foo.go:#123"
+               startOffset = parseOctothorpDecimal(offset)
+               endOffset = startOffset
+       } else {
+               // e.g. "foo.go:#123,#456"
+               startOffset = parseOctothorpDecimal(offset[:comma])
+               endOffset = parseOctothorpDecimal(offset[comma+1:])
+       }
+       if startOffset < 0 || endOffset < 0 {
+               err = fmt.Errorf("invalid offset %q in query position", offset)
+               return
+       }
+       return
+}
+
+// fileOffsetToPos translates the specified file-relative byte offsets
+// into token.Pos form.  It returns an error if the file was not found
+// or the offsets were out of bounds.
+//
+func fileOffsetToPos(file *token.File, startOffset, endOffset int) (start, end token.Pos, err error) {
+       // Range check [start..end], inclusive of both end-points.
+
+       if 0 <= startOffset && startOffset <= file.Size() {
+               start = file.Pos(int(startOffset))
+       } else {
+               err = fmt.Errorf("start position is beyond end of file")
+               return
+       }
+
+       if 0 <= endOffset && endOffset <= file.Size() {
+               end = file.Pos(int(endOffset))
+       } else {
+               err = fmt.Errorf("end position is beyond end of file")
+               return
+       }
+
+       return
+}
+
+// sameFile returns true if x and y have the same basename and denote
+// the same file.
+//
+func sameFile(x, y string) bool {
+       if filepath.Base(x) == filepath.Base(y) { // (optimisation)
+               if xi, err := os.Stat(x); err == nil {
+                       if yi, err := os.Stat(y); err == nil {
+                               return os.SameFile(xi, yi)
+                       }
+               }
+       }
+       return false
+}
+
+// fastQueryPos parses the position string and returns a queryPos.
+// It parses only a single file and does not run the type checker.
+func fastQueryPos(ctxt *build.Context, pos string) (*queryPos, error) {
+       filename, startOffset, endOffset, err := parsePos(pos)
+       if err != nil {
+               return nil, err
+       }
+
+       // Parse the file, opening it the file via the build.Context
+       // so that we observe the effects of the -modified flag.
+       fset := token.NewFileSet()
+       cwd, _ := os.Getwd()
+       f, err := buildutil.ParseFile(fset, ctxt, nil, cwd, filename, parser.Mode(0))
+       // ParseFile usually returns a partial file along with an error.
+       // Only fail if there is no file.
+       if f == nil {
+               return nil, err
+       }
+       if !f.Pos().IsValid() {
+               return nil, fmt.Errorf("%s is not a Go source file", filename)
+       }
+
+       start, end, err := fileOffsetToPos(fset.File(f.Pos()), startOffset, endOffset)
+       if err != nil {
+               return nil, err
+       }
+
+       path, exact := astutil.PathEnclosingInterval(f, start, end)
+       if path == nil {
+               return nil, fmt.Errorf("no syntax here")
+       }
+
+       return &queryPos{fset, start, end, path, exact, nil}, nil
+}