code review 5158043: math: remove the leading F from Fabs etc.

src/cmd/gofix/math.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 (
+        "fmt"
+        "os"
+        "go/ast"
+)
+
+var _ fmt.Stringer
+var _ os.Error
+
+var mathFix = fix{
+        "math",
+        math,
+        `Remove the leading F from math functions such as Fabs.
+
+http://codereview.appspot.com/5158043
+`,
+}
+
+func init() {
+        register(mathFix)
+}
+
+var mathRenames = []struct{ in, out string }{
+        {"Fabs", "Abs"},
+        {"Fdim", "Dim"},
+        {"Fmax", "Max"},
+        {"Fmin", "Min"},
+        {"Fmod", "Mod"},
+}
+
+func math(f *ast.File) bool {
+        if !imports(f, "math") {
+                return false
+        }
+
+        fixed := false
+
+        walk(f, func(n interface{}) {
+                // Rename functions.
+                if expr, ok := n.(ast.Expr); ok {
+                        for _, s := range mathRenames {
+                                if isPkgDot(expr, "math", s.in) {
+                                        expr.(*ast.SelectorExpr).Sel.Name = s.out
+                                        fixed = true
+                                        return
+                                }
+                        }
+                }
+        })
+        return fixed
+}