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go/ast: remove unnecessary result value from ast.Fprint/Print

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These functions are mostly of interest for debugging; the
number of bytes written is uninteresting.

R=r, bradfitz
CC=golang-dev
https://golang.org/cl/5540046
This commit is contained in:
Robert Griesemer 2012-01-12 16:04:32 -08:00
parent c2ffd9d0c2
commit 06479f766c
2 changed files with 11 additions and 15 deletions
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24
src/pkg/go/ast/print.go
View File

@ -36,7 +36,7 @@ func NotNilFilter(_ string, v reflect.Value) bool {
// struct fields for which f(fieldname, fieldvalue) is true are // struct fields for which f(fieldname, fieldvalue) is true are
// are printed; all others are filtered from the output. // are printed; all others are filtered from the output.
// //
func Fprint(w io.Writer, fset *token.FileSet, x interface{}, f FieldFilter) (n int, err error) { func Fprint(w io.Writer, fset *token.FileSet, x interface{}, f FieldFilter) (err error) {
// setup printer // setup printer
p := printer{ p := printer{
output: w, output: w,
@ -48,7 +48,6 @@ func Fprint(w io.Writer, fset *token.FileSet, x interface{}, f FieldFilter) (n i
// install error handler // install error handler
defer func() { defer func() {
n = p.written
if e := recover(); e != nil { if e := recover(); e != nil {
err = e.(localError).err // re-panics if it's not a localError err = e.(localError).err // re-panics if it's not a localError
} }
@ -67,19 +66,18 @@ func Fprint(w io.Writer, fset *token.FileSet, x interface{}, f FieldFilter) (n i
// Print prints x to standard output, skipping nil fields. // Print prints x to standard output, skipping nil fields.
// Print(fset, x) is the same as Fprint(os.Stdout, fset, x, NotNilFilter). // Print(fset, x) is the same as Fprint(os.Stdout, fset, x, NotNilFilter).
func Print(fset *token.FileSet, x interface{}) (int, error) { func Print(fset *token.FileSet, x interface{}) error {
return Fprint(os.Stdout, fset, x, NotNilFilter) return Fprint(os.Stdout, fset, x, NotNilFilter)
} }
type printer struct { type printer struct {
output io.Writer output io.Writer
fset *token.FileSet fset *token.FileSet
filter FieldFilter filter FieldFilter
ptrmap map[interface{}]int // *T -> line number ptrmap map[interface{}]int // *T -> line number
written int // number of bytes written to output indent int // current indentation level
indent int // current indentation level last byte // the last byte processed by Write
last byte // the last byte processed by Write line int // current line number
line int // current line number
} }
var indent = []byte(". ") var indent = []byte(". ")
@ -122,9 +120,7 @@ type localError struct {
// printf is a convenience wrapper that takes care of print errors. // printf is a convenience wrapper that takes care of print errors.
func (p *printer) printf(format string, args ...interface{}) { func (p *printer) printf(format string, args ...interface{}) {
n, err := fmt.Fprintf(p, format, args...) if _, err := fmt.Fprintf(p, format, args...); err != nil {
p.written += n
if err != nil {
panic(localError{err}) panic(localError{err})
} }
} }

2
src/pkg/go/ast/print_test.go
View File

@ -66,7 +66,7 @@ func TestPrint(t *testing.T) {
var buf bytes.Buffer var buf bytes.Buffer
for _, test := range tests { for _, test := range tests {
buf.Reset() buf.Reset()
if _, err := Fprint(&buf, nil, test.x, nil); err != nil { if err := Fprint(&buf, nil, test.x, nil); err != nil {
t.Errorf("Fprint failed: %s", err) t.Errorf("Fprint failed: %s", err)
} }
if s, ts := trim(buf.String()), trim(test.s); s != ts { if s, ts := trim(buf.String()), trim(test.s); s != ts {