func (c *Suggester) analyzePackage(importer types.Importer, filename string, data []byte, cursor int) (*token.FileSet, token.Pos, *types.Package) {
// If we're in trailing white space at the end of a scope,
// sometimes go/types doesn't recognize that variables should
// still be in scope there.
filesemi := bytes.Join([][]byte{data[:cursor], []byte(";"), data[cursor:]}, nil)
fset := token.NewFileSet()
fileAST, err := parser.ParseFile(fset, filename, filesemi, parser.AllErrors)
if err != nil && c.debug {
logParseError("Error parsing input file (outer block)", err)
}
pos := fset.File(fileAST.Pos()).Pos(cursor)
var otherASTs []*ast.File
for _, otherName := range c.findOtherPackageFiles(filename, fileAST.Name.Name) {
ast, err := parser.ParseFile(fset, otherName, nil, 0)
if err != nil && c.debug {
logParseError("Error parsing other file", err)
}
otherASTs = append(otherASTs, ast)
}
var cfg types.Config
cfg.Importer = importer
cfg.Error = func(err error) {}
var info types.Info
info.Scopes = make(map[ast.Node]*types.Scope)
pkg, _ := cfg.Check("", fset, append(otherASTs, fileAST), &info)
// Workaround golang.org/issue/15686.
for node, scope := range info.Scopes {
switch node := node.(type) {
case *ast.RangeStmt:
for _, name := range scope.Names() {
setScopePos(scope.Lookup(name).(*types.Var), node.X.End())
}
}
}
return fset, pos, pkg
}
// NewPackage returns a new Package struct, which can be
// used to generate code related to the package. The package
// might be given as either an absolute path or an import path.
// If the package can't be found or the package is not compilable,
// this function returns an error.
func NewPackage(path string) (*Package, error) {
p := &_package{Path: path, fset: token.NewFileSet()}
pkg, err := findPackage(path)
if err != nil {
return nil, fmt.Errorf("could not find package: %s", err)
}
fileNames := packageFiles(pkg)
if len(fileNames) == 0 {
return nil, fmt.Errorf("no go files")
}
p.astFiles = make([]*ast.File, len(fileNames))
p.files = make(map[string]*file, len(fileNames))
for ii, v := range fileNames {
f, err := parseFile(p.fset, v)
if err != nil {
return nil, fmt.Errorf("could not parse %s: %s", v, err)
}
p.files[v] = f
p.astFiles[ii] = f.ast
}
context := &types.Config{
IgnoreFuncBodies: true,
FakeImportC: true,
Error: errorHandler,
}
ipath := pkg.ImportPath
if ipath == "." {
// Check won't accept a "." import
abs, err := filepath.Abs(pkg.Dir)
if err != nil {
return nil, err
}
for _, v := range strings.Split(build.Default.GOPATH, ":") {
src := filepath.Join(v, "src")
if strings.HasPrefix(abs, src) {
ipath = abs[len(src)+1:]
break
}
}
}
var info types.Info
info.Types = make(map[ast.Expr]types.TypeAndValue)
info.Defs = make(map[*ast.Ident]types.Object)
info.Uses = make(map[*ast.Ident]types.Object)
info.Implicits = make(map[ast.Node]types.Object)
info.Selections = make(map[*ast.SelectorExpr]*types.Selection)
info.Scopes = make(map[ast.Node]*types.Scope)
tpkg, err := context.Check(ipath, p.fset, p.astFiles, &info)
if err != nil {
// This error is caused by using fields in C structs, ignore it
if !strings.Contains(err.Error(), "invalid type") {
return nil, fmt.Errorf("error checking package: %s", err)
}
}
return &Package{
Package: tpkg,
dir: pkg.Dir,
pkg: p,
info: &info,
}, nil
}