fix(internal/godocfx): use exact list of top-level decls (#3665)

internal/godocfx/parse.go

@@ -155,6 +155,7 @@ func parse(glob string, workingDir string, optionalExtraFiles []string) (*result
 	// independently.
 	for _, pi := range pkgInfos {
 		link := newLinker(pi.pkg.Imports, pi.importRenames)
+		topLevelDecls := pkgsite.TopLevelDecls(pi.doc)
 		pkgItem := &item{
 			UID:      pi.doc.ImportPath,
 			Name:     pi.doc.ImportPath,
@@ -181,7 +182,7 @@ func parse(glob string, workingDir string, optionalExtraFiles []string) (*result
 				Type:    "const",
 				Summary: c.Doc,
 				Langs:   onlyGo,
-				Syntax:  syntax{Content: pkgsite.PrintType(pi.fset, c.Decl, toURL)},
+				Syntax:  syntax{Content: pkgsite.PrintType(pi.fset, c.Decl, toURL, topLevelDecls)},
 			})
 		}
 		for _, v := range pi.doc.Vars {
@@ -197,7 +198,7 @@ func parse(glob string, workingDir string, optionalExtraFiles []string) (*result
 				Type:    "variable",
 				Summary: v.Doc,
 				Langs:   onlyGo,
-				Syntax:  syntax{Content: pkgsite.PrintType(pi.fset, v.Decl, toURL)},
+				Syntax:  syntax{Content: pkgsite.PrintType(pi.fset, v.Decl, toURL, topLevelDecls)},
 			})
 		}
 		for _, t := range pi.doc.Types {
@@ -211,7 +212,7 @@ func parse(glob string, workingDir string, optionalExtraFiles []string) (*result
 				Type:     "type",
 				Summary:  t.Doc,
 				Langs:    onlyGo,
-				Syntax:   syntax{Content: pkgsite.PrintType(pi.fset, t.Decl, toURL)},
+				Syntax:   syntax{Content: pkgsite.PrintType(pi.fset, t.Decl, toURL, topLevelDecls)},
 				Examples: processExamples(t.Examples, pi.fset),
 			}
 			// Note: items are added as page.Children, rather than
@@ -230,7 +231,7 @@ func parse(glob string, workingDir string, optionalExtraFiles []string) (*result
 					Type:    "const",
 					Summary: c.Doc,
 					Langs:   onlyGo,
-					Syntax:  syntax{Content: pkgsite.PrintType(pi.fset, c.Decl, toURL)},
+					Syntax:  syntax{Content: pkgsite.PrintType(pi.fset, c.Decl, toURL, topLevelDecls)},
 				})
 			}
 			for _, v := range t.Vars {
@@ -246,7 +247,7 @@ func parse(glob string, workingDir string, optionalExtraFiles []string) (*result
 					Type:    "variable",
 					Summary: v.Doc,
 					Langs:   onlyGo,
-					Syntax:  syntax{Content: pkgsite.PrintType(pi.fset, v.Decl, toURL)},
+					Syntax:  syntax{Content: pkgsite.PrintType(pi.fset, v.Decl, toURL, topLevelDecls)},
 				})
 			}
 
@@ -336,7 +337,6 @@ func (l *linker) linkify(s string) string {
 		prefix += "*"
 	}
 
-	// If s does not have a dot, it's in this package.
 	if !strings.Contains(s, ".") {
 		// If s is not exported, it's probably a builtin.
 		if !token.IsExported(s) {

third_party/pkgsite/print_type.go

@@ -36,8 +36,8 @@ import (
 //   4. Use scanner.Scanner to find every identifier (in the same order as step
 //      2). If there is a link for the identifier, insert it. Otherwise, print
 //      the plain doc.
-func PrintType(fset *token.FileSet, decl ast.Decl, toURL func(string, string) string) string {
-	anchorLinksMap := generateAnchorLinks(decl, toURL)
+func PrintType(fset *token.FileSet, decl ast.Decl, toURL func(string, string) string, topLevelDecls map[interface{}]bool) string {
+	anchorLinksMap := generateAnchorLinks(decl, toURL, topLevelDecls)
 	// Convert the map (keyed by *ast.Ident) to a slice of URLs (or no URL).
 	//
 	// This relies on the ast.Inspect and scanner.Scanner both
@@ -149,7 +149,7 @@ func stringBasicLitSize(s string) string {
 
 // generateAnchorLinks returns a mapping of *ast.Ident objects to the URL
 // that the identifier should link to.
-func generateAnchorLinks(decl ast.Decl, toURL func(string, string) string) map[*ast.Ident]string {
+func generateAnchorLinks(decl ast.Decl, toURL func(string, string) string, topLevelDecls map[interface{}]bool) map[*ast.Ident]string {
 	m := map[*ast.Ident]string{}
 	ignore := map[ast.Node]bool{}
 	ast.Inspect(decl, func(node ast.Node) bool {
@@ -175,8 +175,7 @@ func generateAnchorLinks(decl ast.Decl, toURL func(string, string) string) map[*
 		case *ast.Ident:
 			if node.Obj == nil && doc.IsPredeclared(node.Name) {
 				m[node] = toURL("builtin", node.Name)
-			} else if node.Obj != nil && node.Obj.Kind != ast.Var {
-				// TODO:  && topLevelDecls[node.Obj.Decl]
+			} else if node.Obj != nil && topLevelDecls[node.Obj.Decl] {
 				m[node] = toURL("", node.Name)
 			}
 		case *ast.FuncDecl:
@@ -196,3 +195,45 @@ func generateAnchorLinks(decl ast.Decl, toURL func(string, string) string) map[*
 	})
 	return m
 }
+
+// TopLevelDecls returns the top level declarations in the package.
+func TopLevelDecls(pkg *doc.Package) map[interface{}]bool {
+	topLevelDecls := map[interface{}]bool{}
+	forEachPackageDecl(pkg, func(decl ast.Decl) {
+		topLevelDecls[decl] = true
+		if gd, _ := decl.(*ast.GenDecl); gd != nil {
+			for _, sp := range gd.Specs {
+				topLevelDecls[sp] = true
+			}
+		}
+	})
+	return topLevelDecls
+}
+
+// forEachPackageDecl iterates though every top-level declaration in a package.
+func forEachPackageDecl(pkg *doc.Package, fnc func(decl ast.Decl)) {
+	for _, c := range pkg.Consts {
+		fnc(c.Decl)
+	}
+	for _, v := range pkg.Vars {
+		fnc(v.Decl)
+	}
+	for _, f := range pkg.Funcs {
+		fnc(f.Decl)
+	}
+	for _, t := range pkg.Types {
+		fnc(t.Decl)
+		for _, c := range t.Consts {
+			fnc(c.Decl)
+		}
+		for _, v := range t.Vars {
+			fnc(v.Decl)
+		}
+		for _, f := range t.Funcs {
+			fnc(f.Decl)
+		}
+		for _, m := range t.Methods {
+			fnc(m.Decl)
+		}
+	}
+}