435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
119 lines
3.1 KiB
Go
119 lines
3.1 KiB
Go
// Copyright 2020 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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// Package analysisinternal exposes internal-only fields from go/analysis.
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package analysisinternal
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import (
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"bytes"
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"fmt"
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"go/ast"
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"go/token"
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"go/types"
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"strings"
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"golang.org/x/tools/go/ast/astutil"
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)
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func TypeErrorEndPos(fset *token.FileSet, src []byte, start token.Pos) token.Pos {
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// Get the end position for the type error.
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offset, end := fset.PositionFor(start, false).Offset, start
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if offset >= len(src) {
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return end
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}
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if width := bytes.IndexAny(src[offset:], " \n,():;[]+-*"); width > 0 {
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end = start + token.Pos(width)
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}
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return end
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}
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func ZeroValue(fset *token.FileSet, f *ast.File, pkg *types.Package, typ types.Type) ast.Expr {
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under := typ
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if n, ok := typ.(*types.Named); ok {
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under = n.Underlying()
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}
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switch u := under.(type) {
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case *types.Basic:
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switch {
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case u.Info()&types.IsNumeric != 0:
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return &ast.BasicLit{Kind: token.INT, Value: "0"}
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case u.Info()&types.IsBoolean != 0:
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return &ast.Ident{Name: "false"}
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case u.Info()&types.IsString != 0:
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return &ast.BasicLit{Kind: token.STRING, Value: `""`}
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default:
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panic("unknown basic type")
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}
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case *types.Chan, *types.Interface, *types.Map, *types.Pointer, *types.Signature, *types.Slice:
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return ast.NewIdent("nil")
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case *types.Struct:
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texpr := typeExpr(fset, f, pkg, typ) // typ because we want the name here.
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if texpr == nil {
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return nil
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}
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return &ast.CompositeLit{
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Type: texpr,
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}
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case *types.Array:
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texpr := typeExpr(fset, f, pkg, u.Elem())
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if texpr == nil {
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return nil
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}
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return &ast.CompositeLit{
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Type: &ast.ArrayType{
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Elt: texpr,
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Len: &ast.BasicLit{Kind: token.INT, Value: fmt.Sprintf("%v", u.Len())},
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},
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}
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}
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return nil
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}
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func typeExpr(fset *token.FileSet, f *ast.File, pkg *types.Package, typ types.Type) ast.Expr {
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switch t := typ.(type) {
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case *types.Basic:
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switch t.Kind() {
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case types.UnsafePointer:
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return &ast.SelectorExpr{X: ast.NewIdent("unsafe"), Sel: ast.NewIdent("Pointer")}
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default:
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return ast.NewIdent(t.Name())
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}
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case *types.Named:
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if t.Obj().Pkg() == pkg {
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return ast.NewIdent(t.Obj().Name())
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}
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pkgName := t.Obj().Pkg().Name()
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// If the file already imports the package under another name, use that.
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for _, group := range astutil.Imports(fset, f) {
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for _, cand := range group {
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if strings.Trim(cand.Path.Value, `"`) == t.Obj().Pkg().Path() {
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if cand.Name != nil && cand.Name.Name != "" {
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pkgName = cand.Name.Name
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}
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}
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}
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}
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if pkgName == "." {
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return ast.NewIdent(t.Obj().Name())
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}
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return &ast.SelectorExpr{
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X: ast.NewIdent(pkgName),
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Sel: ast.NewIdent(t.Obj().Name()),
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}
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default:
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return nil // TODO: anonymous structs, but who does that
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}
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}
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var GetTypeErrors = func(p interface{}) []types.Error { return nil }
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var SetTypeErrors = func(p interface{}, errors []types.Error) {}
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type TypeErrorPass string
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const (
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NoNewVars TypeErrorPass = "nonewvars"
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NoResultValues TypeErrorPass = "noresultvalues"
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UndeclaredName TypeErrorPass = "undeclaredname"
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)
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