code review 5327064: html,bzip2,sql: rename Error methods that return error ...

src/cmd/gofix/htmlerr.go

+// 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 main
+
+import (
+        "go/ast"
+)
+
+func init() {
+        register(htmlerrFix)
+}
+
+var htmlerrFix = fix{
+        "htmlerr",
+        "2011-11-04",
+        htmlerr,
+        `Rename html's Tokenizer.Error method to Err.
+
+http://codereview.appspot.com/5327064/
+`,
+}
+
+var htmlerrTypeConfig = &TypeConfig{
+        Func: map[string]string{
+                "html.NewTokenizer": "html.Tokenizer",
+        },
+}
+
+func htmlerr(f *ast.File) bool {
+        if !imports(f, "html") {
+                return false
+        }
+
+        typeof, _ := typecheck(htmlerrTypeConfig, f)
+
+        fixed := false
+        walk(f, func(n interface{}) {
+                s, ok := n.(*ast.SelectorExpr)
+                if ok && typeof[s.X] == "html.Tokenizer" && s.Sel.Name == "Error" {
+                        s.Sel.Name = "Err"
+                        fixed = true
+                }
+        })
+        return fixed
+}