go/analysis: more API renamings:

Info -> TypesInfo
              Syntax -> Files
          Diagnostic -> Finding

Also, diagnostics are now reported by calling Pass.Report (or Reportf).

Change-Id: Id5e0745fca914699a6a64be3554049ffc02e822b
Reviewed-on: https://go-review.googlesource.com/137395
Reviewed-by: Michael Matloob <matloob@golang.org>

go/analysis/analysis.go

@@ -92,10 +92,10 @@ type Pass struct {
 	Analyzer *Analyzer // the identity of the current analyzer
 
 	// syntax and type information
-	Fset   *token.FileSet // file position information
-	Syntax []*ast.File    // the abstract syntax tree of each file
-	Pkg    *types.Package // type information about the package
-	Info   *types.Info    // type information about the syntax trees
+	Fset      *token.FileSet // file position information
+	Files     []*ast.File    // the abstract syntax tree of each file
+	Pkg       *types.Package // type information about the package
+	TypesInfo *types.Info    // type information about the syntax trees
 
 	// ResultOf provides the inputs to this analysis pass, which are
 	// the corresponding results of its prerequisite analyzers.
@@ -119,10 +119,10 @@ type Pass struct {
 
 	// -- outputs --
 
-	// Findings is a list of findings about specific locations
-	// in the analyzed source code, such as potential mistakes.
-	// It is populated by the Run function.
-	Findings []*Finding
+	// Report reports a Diagnostic, a finding about a specific location
+	// in the analyzed source code such as a potential mistake.
+	// It may be called by the Run function.
+	Report func(Diagnostic)
 
 	// ExportObjectFact associates a fact of type *T with the obj,
 	// replacing any previous fact of that type.
@@ -140,14 +140,11 @@ type Pass struct {
 	// For example, suggested or applied refactorings.
 }
 
-// Findingf is a helper function that creates a new Finding using the
-// specified position and formatted error message, appends it to
-// pass.Findings, and returns it.
-func (pass *Pass) Findingf(pos token.Pos, format string, args ...interface{}) *Finding {
+// Reportf is a helper function that reports a Diagnostic using the
+// specified position and formatted error message.
+func (pass *Pass) Reportf(pos token.Pos, format string, args ...interface{}) {
 	msg := fmt.Sprintf(format, args...)
-	f := &Finding{Pos: pos, Message: msg}
-	pass.Findings = append(pass.Findings, f)
-	return f
+	pass.Report(Diagnostic{Pos: pos, Message: msg})
 }
 
 func (pass *Pass) String() string {
@@ -192,12 +189,12 @@ type Fact interface {
 	AFact() // dummy method to avoid type errors
 }
 
-// A Finding is a message associated with a source location.
+// A Diagnostic is a message associated with a source location.
 //
-// An Analyzer may return a variety of findings; the optional Category,
+// An Analyzer may return a variety of diagnostics; the optional Category,
 // which should be a constant, may be used to classify them.
 // It is primarily intended to make it easy to look up documentation.
-type Finding struct {
+type Diagnostic struct {
 	Pos      token.Pos
 	Category string // optional
 	Message  string

go/analysis/passes/findcall/findcall.go

@@ -1,5 +1,5 @@
 // The findcall package is a trivial example and test of an analyzer of
-// Go source code. It reports a finding for every call to a function or
+// Go source code. It reports a diagnostic for every call to a function or
 // method of the name specified by its --name flag.
 package findcall
 
@@ -23,7 +23,7 @@ func init() {
 }
 
 func findcall(pass *analysis.Pass) (interface{}, error) {
-	for _, f := range pass.Syntax {
+	for _, f := range pass.Files {
 		ast.Inspect(f, func(n ast.Node) bool {
 			if call, ok := n.(*ast.CallExpr); ok {
 				var id *ast.Ident
@@ -33,8 +33,8 @@ func findcall(pass *analysis.Pass) (interface{}, error) {
 				case *ast.SelectorExpr:
 					id = fun.Sel
 				}
-				if id != nil && !pass.Info.Types[id].IsType() && id.Name == name {
-					pass.Findingf(call.Lparen, "call of %s(...)", id.Name)
+				if id != nil && !pass.TypesInfo.Types[id].IsType() && id.Name == name {
+					pass.Reportf(call.Lparen, "call of %s(...)", id.Name)
 				}
 			}
 			return true

go/analysis/passes/pkgfact/pkgfact.go

@@ -15,7 +15,7 @@
 //
 //   {"greeting": "hello", "audience": "world"}.
 //
-// In addition, the analysis reports a finding at each import
+// In addition, the analysis reports a diagnostic at each import
 // showing which key/value pairs it contributes.
 package pkgfact
 
@@ -54,14 +54,14 @@ func run(pass *analysis.Pass) (interface{}, error) {
 	// package and accumulate its information into the result.
 	// (Warning: accumulation leads to quadratic growth of work.)
 	doImport := func(spec *ast.ImportSpec) {
-		pkg := pass.Info.Defs[spec.Name].(*types.PkgName).Imported()
+		pkg := pass.TypesInfo.Defs[spec.Name].(*types.PkgName).Imported()
 		var fact pairsFact
 		if pass.ImportPackageFact(pkg, &fact) {
 			for _, pair := range fact {
 				eq := strings.IndexByte(pair, '=')
 				result[pair[:eq]] = pair[1+eq:]
 			}
-			pass.Findingf(spec.Pos(), "%s", strings.Join(fact, " "))
+			pass.Reportf(spec.Pos(), "%s", strings.Join(fact, " "))
 		}
 	}
 
@@ -72,14 +72,14 @@ func run(pass *analysis.Pass) (interface{}, error) {
 				name := spec.Names[i].Name
 				if strings.HasPrefix(name, "_") {
 					key := name[1:]
-					value := pass.Info.Types[spec.Values[i]].Value.String()
+					value := pass.TypesInfo.Types[spec.Values[i]].Value.String()
 					result[key] = value
 				}
 			}
 		}
 	}
 
-	for _, f := range pass.Syntax {
+	for _, f := range pass.Files {
 		for _, decl := range f.Decls {
 			if decl, ok := decl.(*ast.GenDecl); ok {
 				for _, spec := range decl.Specs {