/
util.go
139 lines (120 loc) · 3.03 KB
/
util.go
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// Copyright 2014 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 aster
import (
"go/ast"
"go/token"
"go/types"
"os"
"path/filepath"
"reflect"
"runtime"
"strconv"
"strings"
"sync/atomic"
"unicode"
"golang.org/x/tools/go/ast/astutil"
)
func cloneIdent(i *ast.Ident) *ast.Ident {
return &ast.Ident{
Name: i.Name,
Obj: i.Obj,
}
}
func cloneBasicLit(b *ast.BasicLit) *ast.BasicLit {
if b == nil {
return nil
}
return &ast.BasicLit{
Kind: b.Kind,
Value: b.Value,
}
}
func textOrError(text string, err error) string {
if err == nil {
return text
}
return "// aster: " + err.Error()
}
var filenameID int32
func autoFilename(f *ast.File) string {
id := strconv.Itoa(int(atomic.AddInt32(&filenameID, 1)))
return f.Name.Name + "/" + id + ".go"
}
func objectKind(obj types.Object) string {
switch obj := obj.(type) {
case *types.PkgName:
return "imported package name"
case *types.TypeName:
return "type"
case *types.Var:
if obj.IsField() {
return "field"
}
case *types.Func:
if obj.Type().(*types.Signature).Recv() != nil {
return "method"
}
}
// label, func, var, const
return strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types."))
}
func typeKind(T types.Type) string {
return strings.ToLower(strings.TrimPrefix(reflect.TypeOf(T.Underlying()).String(), "*types."))
}
// NB: for renamings, blank is not considered valid.
func isValidIdentifier(id string) bool {
if id == "" || id == "_" {
return false
}
for i, r := range id {
if !isLetter(r) && (i == 0 || !isDigit(r)) {
return false
}
}
return token.Lookup(id) == token.IDENT
}
// isLocal reports whether obj is local to some function.
// Precondition: not a struct field or interface method.
func isLocal(obj types.Object) bool {
// [... 5=stmt 4=func 3=file 2=pkg 1=universe]
var depth int
for scope := obj.Parent(); scope != nil; scope = scope.Parent() {
depth++
}
return depth >= 4
}
func isPackageLevel(obj types.Object) bool {
return obj.Pkg().Scope().Lookup(obj.Name()) == obj
}
// -- Plundered from go/scanner: ---------------------------------------
func isLetter(ch rune) bool {
return 'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z' || ch == '_' || ch >= 0x80 && unicode.IsLetter(ch)
}
func isDigit(ch rune) bool {
return '0' <= ch && ch <= '9' || ch >= 0x80 && unicode.IsDigit(ch)
}
// -- Plundered from golang.org/x/tools/cmd/guru -----------------
// sameFile returns true if x and y have the same basename and denote
// the same file.
//
func sameFile(x, y string) bool {
if runtime.GOOS == "windows" {
x = filepath.ToSlash(x)
y = filepath.ToSlash(y)
}
if x == y {
return true
}
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
}
// unparen returns e with any enclosing parentheses stripped.
func unparen(e ast.Expr) ast.Expr { return astutil.Unparen(e) }