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|
// Copyright 2011 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 types_test
import (
"fmt"
"go/ast"
"go/parser"
"go/token"
"sort"
"testing"
_ "code.google.com/p/go.tools/go/gcimporter"
. "code.google.com/p/go.tools/go/types"
)
var sources = []string{
`
package p
import "fmt"
import "math"
const pi = math.Pi
func sin(x float64) float64 {
return math.Sin(x)
}
var Println = fmt.Println
`,
`
package p
import "fmt"
type errorStringer struct { fmt.Stringer; error }
func f() string {
_ = "foo"
return fmt.Sprintf("%d", g())
}
func g() (x int) { return }
`,
`
package p
import . "go/parser"
import "sync"
func h() Mode { return ImportsOnly }
var _, x int = 1, 2
func init() {}
type T struct{ *sync.Mutex; a, b, c int}
type I interface{ m() }
var _ = T{a: 1, b: 2, c: 3}
func (_ T) m() {}
func (T) _() {}
var i I
var _ = i.m
func _(s []int) { for i, x := range s { _, _ = i, x } }
func _(x interface{}) {
switch x := x.(type) {
case int:
_ = x
}
switch {} // implicit 'true' tag
}
`,
`
package p
type S struct{}
func (T) _() {}
func (T) _() {}
`,
`
package p
func _() {
L0:
L1:
goto L0
for {
goto L1
}
if true {
goto L2
}
L2:
}
`,
}
var pkgnames = []string{
"fmt",
"math",
}
func TestResolveIdents(t *testing.T) {
// parse package files
fset := token.NewFileSet()
var files []*ast.File
for i, src := range sources {
f, err := parser.ParseFile(fset, fmt.Sprintf("sources[%d]", i), src, parser.DeclarationErrors)
if err != nil {
t.Fatal(err)
}
files = append(files, f)
}
// resolve and type-check package AST
var conf Config
uses := make(map[*ast.Ident]Object)
defs := make(map[*ast.Ident]Object)
_, err := conf.Check("testResolveIdents", fset, files, &Info{Defs: defs, Uses: uses})
if err != nil {
t.Fatal(err)
}
// check that all packages were imported
for _, name := range pkgnames {
if conf.Packages[name] == nil {
t.Errorf("package %s not imported", name)
}
}
// check that qualified identifiers are resolved
for _, f := range files {
ast.Inspect(f, func(n ast.Node) bool {
if s, ok := n.(*ast.SelectorExpr); ok {
if x, ok := s.X.(*ast.Ident); ok {
obj := uses[x]
if obj == nil {
t.Errorf("%s: unresolved qualified identifier %s", fset.Position(x.Pos()), x.Name)
return false
}
if _, ok := obj.(*PkgName); ok && uses[s.Sel] == nil {
t.Errorf("%s: unresolved selector %s", fset.Position(s.Sel.Pos()), s.Sel.Name)
return false
}
return false
}
return false
}
return true
})
}
for id, obj := range uses {
if obj == nil {
t.Errorf("%s: Uses[%s] == nil", fset.Position(id.Pos()), id.Name)
}
}
// check that each identifier in the source is found in uses or defs or both
var both []string
for _, f := range files {
ast.Inspect(f, func(n ast.Node) bool {
if x, ok := n.(*ast.Ident); ok {
var objects int
if _, found := uses[x]; found {
objects |= 1
delete(uses, x)
}
if _, found := defs[x]; found {
objects |= 2
delete(defs, x)
}
if objects == 0 {
t.Errorf("%s: unresolved identifier %s", fset.Position(x.Pos()), x.Name)
} else if objects == 3 {
both = append(both, x.Name)
}
return false
}
return true
})
}
// check the expected set of idents that are simultaneously uses and defs
sort.Strings(both)
if got, want := fmt.Sprint(both), "[Mutex Stringer error]"; got != want {
t.Errorf("simultaneous uses/defs = %s, want %s", got, want)
}
// any left-over identifiers didn't exist in the source
for x := range uses {
t.Errorf("%s: identifier %s not present in source", fset.Position(x.Pos()), x.Name)
}
for x := range defs {
t.Errorf("%s: identifier %s not present in source", fset.Position(x.Pos()), x.Name)
}
// TODO(gri) add tests to check ImplicitObj callbacks
}
|
