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author | Alan Donovan <adonovan@google.com> | 2015-09-01 22:24:56 +0000 |
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committer | android-build-merger <android-build-merger@google.com> | 2015-09-01 22:24:56 +0000 |
commit | b07db0248f6bd1e19d807acc4c2e31d857f9bc75 (patch) | |
tree | 4c71a3df673d737c600749340c9a7c7be9a55a26 | |
parent | 51902a864d0c82bea7f028a0c582b3410aa92be1 (diff) | |
parent | 749901c67649e560c838fd4d6c6aa458938b31f5 (diff) | |
download | tools-b07db0248f6bd1e19d807acc4c2e31d857f9bc75.tar.gz |
go/types: add an API test of the Scope type
automerge: 749901c
* commit '749901c67649e560c838fd4d6c6aa458938b31f5':
go/types: add an API test of the Scope type
-rw-r--r-- | go/types/api_test.go | 106 | ||||
-rw-r--r-- | go/types/scope.go | 11 |
2 files changed, 116 insertions, 1 deletions
diff --git a/go/types/api_test.go b/go/types/api_test.go index 48bed84..96e10d4 100644 --- a/go/types/api_test.go +++ b/go/types/api_test.go @@ -10,6 +10,8 @@ import ( "go/ast" "go/parser" "go/token" + "reflect" + "regexp" "runtime" "strings" "testing" @@ -863,7 +865,7 @@ func TestIssue8518(t *testing.T) { } const libSrc = ` -package a +package a import "missing" const C1 = foo const C2 = missing.C @@ -953,3 +955,105 @@ func sameSlice(a, b []int) bool { } return true } + +// TestScopeLookupParent ensures that (*Scope).LookupParent returns +// the correct result at various positions with the source. +func TestScopeLookupParent(t *testing.T) { + fset := token.NewFileSet() + conf := Config{ + Packages: make(map[string]*Package), + Import: func(imports map[string]*Package, path string) (*Package, error) { + return imports[path], nil + }, + } + mustParse := func(src string) *ast.File { + f, err := parser.ParseFile(fset, "dummy.go", src, parser.ParseComments) + if err != nil { + t.Fatal(err) + } + return f + } + var info Info + makePkg := func(path string, files ...*ast.File) { + conf.Packages[path], _ = conf.Check(path, fset, files, &info) + } + + makePkg("lib", mustParse("package lib; var X int")) + // Each /*name=kind:line*/ comment makes the test look up the + // name at that point and checks that it resolves to a decl of + // the specified kind and line number. "undef" means undefined. + mainSrc := ` +package main +import "lib" +var Y = lib.X +func f() { + print(Y) /*Y=var:4*/ + z /*z=undef*/ := /*z=undef*/ 1 /*z=var:7*/ + print(z) + /*f=func:5*/ /*lib=pkgname:3*/ + type /*T=undef*/ T /*T=typename:10*/ *T +} +` + info.Uses = make(map[*ast.Ident]Object) + f := mustParse(mainSrc) + makePkg("main", f) + mainScope := conf.Packages["main"].Scope() + rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`) + for _, group := range f.Comments { + for _, comment := range group.List { + // Parse the assertion in the comment. + m := rx.FindStringSubmatch(comment.Text) + if m == nil { + t.Errorf("%s: bad comment: %s", + fset.Position(comment.Pos()), comment.Text) + continue + } + name, want := m[1], m[2] + + // Look up the name in the innermost enclosing scope. + inner := mainScope.Innermost(comment.Pos()) + if inner == nil { + t.Errorf("%s: at %s: can't find innermost scope", + fset.Position(comment.Pos()), comment.Text) + continue + } + got := "undef" + if _, obj := inner.LookupParent(name, comment.Pos()); obj != nil { + kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types.")) + got = fmt.Sprintf("%s:%d", kind, fset.Position(obj.Pos()).Line) + } + if got != want { + t.Errorf("%s: at %s: %s resolved to %s, want %s", + fset.Position(comment.Pos()), comment.Text, name, got, want) + } + } + } + + // Check that for each referring identifier, + // a lookup of its name on the innermost + // enclosing scope returns the correct object. + + for id, wantObj := range info.Uses { + inner := mainScope.Innermost(id.Pos()) + if inner == nil { + t.Errorf("%s: can't find innermost scope enclosing %q", + fset.Position(id.Pos()), id.Name) + continue + } + + // Exclude selectors and qualified identifiers---lexical + // refs only. (Ideally, we'd see if the AST parent is a + // SelectorExpr, but that requires PathEnclosingInterval + // from golang.org/x/tools/go/ast/astutil.) + if id.Name == "X" { + continue + } + + _, gotObj := inner.LookupParent(id.Name, id.Pos()) + if gotObj != wantObj { + t.Errorf("%s: got %v, want %v", + fset.Position(id.Pos()), gotObj, wantObj) + continue + } + } +} diff --git a/go/types/scope.go b/go/types/scope.go index dae5def..3502840 100644 --- a/go/types/scope.go +++ b/go/types/scope.go @@ -126,9 +126,20 @@ func (s *Scope) Contains(pos token.Pos) bool { // Innermost returns the innermost (child) scope containing // pos. If pos is not within any scope, the result is nil. +// The result is also nil for the Universe scope. // The result is guaranteed to be valid only if the type-checked // AST has complete position information. func (s *Scope) Innermost(pos token.Pos) *Scope { + // Package scopes do not have extents since they may be + // discontiguous, so iterate over the package's files. + if s.parent == Universe { + for _, s := range s.children { + if inner := s.Innermost(pos); inner != nil { + return inner + } + } + } + if s.Contains(pos) { for _, s := range s.children { if s.Contains(pos) { |