1 files changed, 178 insertions, 0 deletions
diff --git a/vendor/github.com/mgechev/revive/lint/package.go b/vendor/github.com/mgechev/revive/lint/package.go
new file mode 100644
index 0000000000..7b6046fd7e
--- /dev/null
+++ b/vendor/github.com/mgechev/revive/lint/package.go
@@ -0,0 +1,178 @@
+package lint
+
+import (
+	"go/ast"
+	"go/token"
+	"go/types"
+	"sync"
+
+	"golang.org/x/tools/go/gcexportdata"
+)
+
+// Package represents a package in the project.
+type Package struct {
+	fset  *token.FileSet
+	files map[string]*File
+
+	TypesPkg  *types.Package
+	TypesInfo *types.Info
+
+	// sortable is the set of types in the package that implement sort.Interface.
+	Sortable map[string]bool
+	// main is whether this is a "main" package.
+	main int
+	mu   sync.Mutex
+}
+
+var newImporter = func(fset *token.FileSet) types.ImporterFrom {
+	return gcexportdata.NewImporter(fset, make(map[string]*types.Package))
+}
+
+var (
+	trueValue  = 1
+	falseValue = 2
+	notSet     = 3
+)
+
+// IsMain returns if that's the main package.
+func (p *Package) IsMain() bool {
+	if p.main == trueValue {
+		return true
+	} else if p.main == falseValue {
+		return false
+	}
+	for _, f := range p.files {
+		if f.isMain() {
+			p.main = trueValue
+			return true
+		}
+	}
+	p.main = falseValue
+	return false
+}
+
+// TypeCheck performs type checking for given package.
+func (p *Package) TypeCheck() error {
+	p.mu.Lock()
+	// If type checking has already been performed
+	// skip it.
+	if p.TypesInfo != nil || p.TypesPkg != nil {
+		p.mu.Unlock()
+		return nil
+	}
+	config := &types.Config{
+		// By setting a no-op error reporter, the type checker does as much work as possible.
+		Error:    func(error) {},
+		Importer: newImporter(p.fset),
+	}
+	info := &types.Info{
+		Types:  make(map[ast.Expr]types.TypeAndValue),
+		Defs:   make(map[*ast.Ident]types.Object),
+		Uses:   make(map[*ast.Ident]types.Object),
+		Scopes: make(map[ast.Node]*types.Scope),
+	}
+	var anyFile *File
+	var astFiles []*ast.File
+	for _, f := range p.files {
+		anyFile = f
+		astFiles = append(astFiles, f.AST)
+	}
+
+	typesPkg, err := check(config, anyFile.AST.Name.Name, p.fset, astFiles, info)
+
+	// Remember the typechecking info, even if config.Check failed,
+	// since we will get partial information.
+	p.TypesPkg = typesPkg
+	p.TypesInfo = info
+	p.mu.Unlock()
+	return err
+}
+
+// check function encapsulates the call to go/types.Config.Check method and
+// recovers if the called method panics (see issue #59)
+func check(config *types.Config, n string, fset *token.FileSet, astFiles []*ast.File, info *types.Info) (p *types.Package, err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			err, _ = r.(error)
+			p = nil
+			return
+		}
+	}()
+
+	return config.Check(n, fset, astFiles, info)
+}
+
+// TypeOf returns the type of an expression.
+func (p *Package) TypeOf(expr ast.Expr) types.Type {
+	if p.TypesInfo == nil {
+		return nil
+	}
+	return p.TypesInfo.TypeOf(expr)
+}
+
+type walker struct {
+	nmap map[string]int
+	has  map[string]int
+}
+
+func (w *walker) Visit(n ast.Node) ast.Visitor {
+	fn, ok := n.(*ast.FuncDecl)
+	if !ok || fn.Recv == nil || len(fn.Recv.List) == 0 {
+		return w
+	}
+	// TODO(dsymonds): We could check the signature to be more precise.
+	recv := receiverType(fn)
+	if i, ok := w.nmap[fn.Name.Name]; ok {
+		w.has[recv] |= i
+	}
+	return w
+}
+
+func (p *Package) scanSortable() {
+	p.Sortable = make(map[string]bool)
+
+	// bitfield for which methods exist on each type.
+	const (
+		Len = 1 << iota
+		Less
+		Swap
+	)
+	nmap := map[string]int{"Len": Len, "Less": Less, "Swap": Swap}
+	has := make(map[string]int)
+	for _, f := range p.files {
+		ast.Walk(&walker{nmap, has}, f.AST)
+	}
+	for typ, ms := range has {
+		if ms == Len|Less|Swap {
+			p.Sortable[typ] = true
+		}
+	}
+}
+
+// receiverType returns the named type of the method receiver, sans "*",
+// or "invalid-type" if fn.Recv is ill formed.
+func receiverType(fn *ast.FuncDecl) string {
+	switch e := fn.Recv.List[0].Type.(type) {
+	case *ast.Ident:
+		return e.Name
+	case *ast.StarExpr:
+		if id, ok := e.X.(*ast.Ident); ok {
+			return id.Name
+		}
+	}
+	// The parser accepts much more than just the legal forms.
+	return "invalid-type"
+}
+
+func (p *Package) lint(rules []Rule, config Config, failures chan Failure) {
+	p.scanSortable()
+	var wg sync.WaitGroup
+	for _, file := range p.files {
+		wg.Add(1)
+		go (func(file *File) {
+			file.lint(rules, config, failures)
+			defer wg.Done()
+		})(file)
+	}
+	wg.Wait()
+}