mirror of
https://github.com/golang/go
synced 2024-11-22 16:54:48 -07:00
fmt: use new reflect interface (CL 31107)
R=r DELTA=208 (37 added, 63 deleted, 108 changed) OCL=31111 CL=31281
This commit is contained in:
Russ Cox
parent
64f4e0b197
commit
0d400a7dea
@ -57,6 +57,13 @@
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operand. Another variant Println inserts blanks between
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operands and appends a newline.
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Regardless of the verb, if an operand is an interface value,
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the internal concrete value is used, not the interface itself.
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Thus:
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var i interface{} = 23;
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fmt.Printf("%v\n", i);
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will print 23.
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If an operand implements interface Format, that interface
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can be used for fine control of formatting.
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@ -191,14 +198,14 @@ func (p *pp) Write(b []byte) (ret int, err os.Error) {
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return len(b), nil;
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}
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func (p *pp) doprintf(format string, v reflect.StructValue);
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func (p *pp) doprint(v reflect.StructValue, addspace, addnewline bool);
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func (p *pp) doprintf(format string, v *reflect.StructValue);
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func (p *pp) doprint(v *reflect.StructValue, addspace, addnewline bool);
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// These routines end in 'f' and take a format string.
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// Fprintf formats according to a format specifier and writes to w.
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func Fprintf(w io.Writer, format string, a ...) (n int, error os.Error) {
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v := reflect.NewValue(a).(reflect.StructValue);
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v := reflect.NewValue(a).(*reflect.StructValue);
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p := newPrinter();
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p.doprintf(format, v);
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n, error = w.Write(p.buf[0:p.n]);
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@ -213,7 +220,7 @@ func Printf(format string, v ...) (n int, errno os.Error) {
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// Sprintf formats according to a format specifier and returns the resulting string.
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func Sprintf(format string, a ...) string {
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v := reflect.NewValue(a).(reflect.StructValue);
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v := reflect.NewValue(a).(*reflect.StructValue);
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p := newPrinter();
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p.doprintf(format, v);
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s := string(p.buf)[0 : p.n];
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@ -225,7 +232,7 @@ func Sprintf(format string, a ...) string {
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// Fprint formats using the default formats for its operands and writes to w.
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// Spaces are added between operands when neither is a string.
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func Fprint(w io.Writer, a ...) (n int, error os.Error) {
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v := reflect.NewValue(a).(reflect.StructValue);
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v := reflect.NewValue(a).(*reflect.StructValue);
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p := newPrinter();
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p.doprint(v, false, false);
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n, error = w.Write(p.buf[0:p.n]);
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@ -242,7 +249,7 @@ func Print(v ...) (n int, errno os.Error) {
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// Sprint formats using the default formats for its operands and returns the resulting string.
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// Spaces are added between operands when neither is a string.
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func Sprint(a ...) string {
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v := reflect.NewValue(a).(reflect.StructValue);
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v := reflect.NewValue(a).(*reflect.StructValue);
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p := newPrinter();
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p.doprint(v, false, false);
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s := string(p.buf)[0 : p.n];
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@ -256,7 +263,7 @@ func Sprint(a ...) string {
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// Fprintln formats using the default formats for its operands and writes to w.
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// Spaces are always added between operands and a newline is appended.
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func Fprintln(w io.Writer, a ...) (n int, error os.Error) {
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v := reflect.NewValue(a).(reflect.StructValue);
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v := reflect.NewValue(a).(*reflect.StructValue);
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p := newPrinter();
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p.doprint(v, true, true);
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n, error = w.Write(p.buf[0:p.n]);
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@ -273,7 +280,7 @@ func Println(v ...) (n int, errno os.Error) {
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// Sprintln formats using the default formats for its operands and returns the resulting string.
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// Spaces are always added between operands and a newline is appended.
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func Sprintln(a ...) string {
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v := reflect.NewValue(a).(reflect.StructValue);
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v := reflect.NewValue(a).(*reflect.StructValue);
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p := newPrinter();
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p.doprint(v, true, true);
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s := string(p.buf)[0 : p.n];
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@ -284,113 +291,93 @@ func Sprintln(a ...) string {
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// Get the i'th arg of the struct value.
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// If the arg itself is an interface, return a value for
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// the thing inside the interface, not the interface itself.
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func getField(v reflect.StructValue, i int) reflect.Value {
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func getField(v *reflect.StructValue, i int) reflect.Value {
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val := v.Field(i);
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if val.Kind() == reflect.InterfaceKind {
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inter := val.(reflect.InterfaceValue).Get();
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if i, ok := val.(*reflect.InterfaceValue); ok {
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if inter := i.Interface(); inter != nil {
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return reflect.NewValue(inter);
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}
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}
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return val;
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}
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// Getters for the fields of the argument structure.
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func getBool(v reflect.Value) (val bool, ok bool) {
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switch v.Kind() {
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case reflect.BoolKind:
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return v.(reflect.BoolValue).Get(), true;
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if b, ok := v.(*reflect.BoolValue); ok {
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return b.Get(), true;
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}
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return false, false
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return;
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}
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func getInt(v reflect.Value) (val int64, signed, ok bool) {
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switch v.Kind() {
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case reflect.IntKind:
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return int64(v.(reflect.IntValue).Get()), true, true;
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case reflect.Int8Kind:
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return int64(v.(reflect.Int8Value).Get()), true, true;
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case reflect.Int16Kind:
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return int64(v.(reflect.Int16Value).Get()), true, true;
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case reflect.Int32Kind:
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return int64(v.(reflect.Int32Value).Get()), true, true;
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case reflect.Int64Kind:
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return int64(v.(reflect.Int64Value).Get()), true, true;
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case reflect.UintKind:
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return int64(v.(reflect.UintValue).Get()), false, true;
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case reflect.Uint8Kind:
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return int64(v.(reflect.Uint8Value).Get()), false, true;
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case reflect.Uint16Kind:
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return int64(v.(reflect.Uint16Value).Get()), false, true;
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case reflect.Uint32Kind:
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return int64(v.(reflect.Uint32Value).Get()), false, true;
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case reflect.Uint64Kind:
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return int64(v.(reflect.Uint64Value).Get()), false, true;
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case reflect.UintptrKind:
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return int64(v.(reflect.UintptrValue).Get()), false, true;
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switch v := v.(type) {
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case *reflect.IntValue:
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return int64(v.Get()), true, true;
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case *reflect.Int8Value:
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return int64(v.Get()), true, true;
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case *reflect.Int16Value:
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return int64(v.Get()), true, true;
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case *reflect.Int32Value:
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return int64(v.Get()), true, true;
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case *reflect.Int64Value:
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return int64(v.Get()), true, true;
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case *reflect.UintValue:
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return int64(v.Get()), false, true;
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case *reflect.Uint8Value:
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return int64(v.Get()), false, true;
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case *reflect.Uint16Value:
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return int64(v.Get()), false, true;
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case *reflect.Uint32Value:
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return int64(v.Get()), false, true;
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case *reflect.Uint64Value:
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return int64(v.Get()), false, true;
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case *reflect.UintptrValue:
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return int64(v.Get()), false, true;
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}
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return 0, false, false;
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return;
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}
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func getString(v reflect.Value) (val string, ok bool) {
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switch v.Kind() {
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case reflect.StringKind:
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return v.(reflect.StringValue).Get(), true;
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case reflect.ArrayKind:
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if val, ok := v.Interface().([]byte); ok {
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return string(val), true;
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if v, ok := v.(*reflect.StringValue); ok {
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return v.Get(), true;
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}
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if bytes, ok := v.Interface().([]byte); ok {
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return string(bytes), true;
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}
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return "", false;
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return;
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}
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func getFloat32(v reflect.Value) (val float32, ok bool) {
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switch v.Kind() {
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case reflect.Float32Kind:
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return float32(v.(reflect.Float32Value).Get()), true;
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case reflect.FloatKind:
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switch v := v.(type) {
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case *reflect.Float32Value:
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return float32(v.Get()), true;
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case *reflect.FloatValue:
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if v.Type().Size()*8 == 32 {
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return float32(v.(reflect.FloatValue).Get()), true;
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return float32(v.Get()), true;
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}
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}
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return 0.0, false;
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return;
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}
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func getFloat64(v reflect.Value) (val float64, ok bool) {
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switch v.Kind() {
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case reflect.FloatKind:
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switch v := v.(type) {
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case *reflect.FloatValue:
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if v.Type().Size()*8 == 64 {
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return float64(v.(reflect.FloatValue).Get()), true;
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return float64(v.Get()), true;
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}
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case reflect.Float64Kind:
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return float64(v.(reflect.Float64Value).Get()), true;
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case *reflect.Float64Value:
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return float64(v.Get()), true;
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}
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return 0.0, false;
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return;
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}
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func getPtr(v reflect.Value) (val uintptr, ok bool) {
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switch v.Kind() {
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case reflect.PtrKind:
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return uintptr(v.(reflect.PtrValue).Get()), true;
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switch v := v.(type) {
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case *reflect.PtrValue:
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return uintptr(v.Get()), true;
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}
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return 0, false;
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}
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func getArrayPtr(v reflect.Value) (val reflect.ArrayValue, ok bool) {
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if v.Kind() == reflect.PtrKind {
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v = v.(reflect.PtrValue).Sub();
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if v.Kind() == reflect.ArrayKind {
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return v.(reflect.ArrayValue), true;
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}
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}
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return nil, false;
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}
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func getArray(v reflect.Value) (val reflect.ArrayValue, ok bool) {
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switch v.Kind() {
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case reflect.ArrayKind:
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return v.(reflect.ArrayValue), true;
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}
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return nil, false;
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return;
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}
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// Convert ASCII to integer. n is 0 (and got is false) if no number present.
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@ -418,101 +405,91 @@ func (p *pp) printField(field reflect.Value) (was_string bool) {
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}
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}
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s := "";
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switch field.Kind() {
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case reflect.BoolKind:
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s = p.fmt.Fmt_boolean(field.(reflect.BoolValue).Get()).Str();
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case reflect.IntKind, reflect.Int8Kind, reflect.Int16Kind, reflect.Int32Kind, reflect.Int64Kind:
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v, signed, ok := getInt(field);
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s = p.fmt.Fmt_d64(v).Str();
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case reflect.UintKind, reflect.Uint8Kind, reflect.Uint16Kind, reflect.Uint32Kind, reflect.Uint64Kind:
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v, signed, ok := getInt(field);
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s = p.fmt.Fmt_ud64(uint64(v)).Str();
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case reflect.UintptrKind:
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v, signed, ok := getInt(field);
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p.fmt.sharp = !p.fmt.sharp; // turn 0x on by default
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s = p.fmt.Fmt_ux64(uint64(v)).Str();
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case reflect.Float32Kind:
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v, ok := getFloat32(field);
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s = p.fmt.Fmt_g32(v).Str();
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case reflect.Float64Kind:
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v, ok := getFloat64(field);
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s = p.fmt.Fmt_g64(v).Str();
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case reflect.FloatKind:
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switch f := field.(type) {
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case *reflect.BoolValue:
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s = p.fmt.Fmt_boolean(f.Get()).Str();
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case *reflect.Float32Value:
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s = p.fmt.Fmt_g32(f.Get()).Str();
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case *reflect.Float64Value:
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s = p.fmt.Fmt_g64(f.Get()).Str();
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case *reflect.FloatValue:
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if field.Type().Size()*8 == 32 {
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v, ok := getFloat32(field);
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s = p.fmt.Fmt_g32(v).Str();
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s = p.fmt.Fmt_g32(float32(f.Get())).Str();
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} else {
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v, ok := getFloat64(field);
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s = p.fmt.Fmt_g64(v).Str();
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s = p.fmt.Fmt_g64(float64(f.Get())).Str();
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}
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case reflect.StringKind:
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v, ok := getString(field);
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s = p.fmt.Fmt_s(v).Str();
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case *reflect.StringValue:
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s = p.fmt.Fmt_s(f.Get()).Str();
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was_string = true;
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case reflect.PtrKind:
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if v, ok := getPtr(field); v == 0 {
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s = "<nil>"
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} else {
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// pointer to array? (TODO(r): holdover; delete?)
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if a, ok := getArrayPtr(field); ok {
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p.addstr("&[");
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for i := 0; i < a.Len(); i++ {
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if i > 0 {
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p.addstr(" ");
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case *reflect.PtrValue:
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v := f.Get();
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if v == 0 {
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s = "<nil>";
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break;
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}
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p.printField(a.Elem(i));
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// pointer to array?
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if a, ok := f.Elem().(reflect.ArrayOrSliceValue); ok {
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p.addstr("&");
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p.printField(a);
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break;
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}
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p.addstr("]");
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} else {
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p.fmt.sharp = !p.fmt.sharp; // turn 0x on by default
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s = p.fmt.Fmt_uX64(uint64(v)).Str();
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}
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}
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case reflect.ArrayKind:
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if a, ok := getArray(field); ok {
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case reflect.ArrayOrSliceValue:
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p.addstr("[");
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for i := 0; i < a.Len(); i++ {
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for i := 0; i < f.Len(); i++ {
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if i > 0 {
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p.addstr(" ");
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}
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p.printField(a.Elem(i));
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p.printField(f.Elem(i));
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}
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p.addstr("]");
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}
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case reflect.StructKind:
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case *reflect.StructValue:
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p.add('{');
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v := field.(reflect.StructValue);
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t := v.Type().(reflect.StructType);
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v := f;
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t := v.Type().(*reflect.StructType);
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donames := p.fmt.plus;
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p.fmt.clearflags(); // clear flags for p.printField
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for i := 0; i < v.Len(); i++ {
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for i := 0; i < v.NumField(); i++ {
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if i > 0 {
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p.add(' ')
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}
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if donames {
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if name, typ, tag, off := t.Field(i); name != "" {
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p.addstr(name);
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if f := t.Field(i); f.Name != "" {
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p.addstr(f.Name);
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p.add('=');
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}
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}
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p.printField(getField(v, i));
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}
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p.add('}');
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case reflect.InterfaceKind:
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value := field.(reflect.InterfaceValue).Value();
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case *reflect.InterfaceValue:
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value := f.Elem();
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if value == nil {
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s = "<nil>"
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} else {
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return p.printField(value);
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}
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case *reflect.UintptrValue:
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p.fmt.sharp = !p.fmt.sharp; // turn 0x on by default
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s = p.fmt.Fmt_ux64(uint64(f.Get())).Str();
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default:
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v, signed, ok := getInt(field);
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if ok {
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if signed {
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s = p.fmt.Fmt_d64(v).Str();
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} else {
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s = p.fmt.Fmt_ud64(uint64(v)).Str();
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}
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break;
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}
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s = "?" + field.Type().String() + "?";
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}
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p.addstr(s);
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return was_string;
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}
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func (p *pp) doprintf(format string, v reflect.StructValue) {
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func (p *pp) doprintf(format string, v *reflect.StructValue) {
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p.ensure(len(format)); // a good starting size
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end := len(format) - 1;
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fieldnum := 0; // we process one field per non-trivial format
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@ -555,7 +532,7 @@ func (p *pp) doprintf(format string, v reflect.StructValue) {
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p.add('%'); // TODO: should we bother with width & prec?
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continue;
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}
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if fieldnum >= v.Len() { // out of operands
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if fieldnum >= v.NumField() { // out of operands
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p.add('%');
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p.add(c);
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p.addstr("(missing)");
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@ -719,11 +696,11 @@ func (p *pp) doprintf(format string, v reflect.StructValue) {
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}
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p.addstr(s);
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}
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if fieldnum < v.Len() {
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if fieldnum < v.NumField() {
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p.addstr("?(extra ");
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for ; fieldnum < v.Len(); fieldnum++ {
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for ; fieldnum < v.NumField(); fieldnum++ {
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p.addstr(getField(v, fieldnum).Type().String());
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if fieldnum + 1 < v.Len() {
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if fieldnum + 1 < v.NumField() {
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p.addstr(", ");
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}
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}
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@ -731,21 +708,18 @@ func (p *pp) doprintf(format string, v reflect.StructValue) {
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}
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}
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func (p *pp) doprint(v reflect.StructValue, addspace, addnewline bool) {
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func (p *pp) doprint(v *reflect.StructValue, addspace, addnewline bool) {
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prev_string := false;
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for fieldnum := 0; fieldnum < v.Len(); fieldnum++ {
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for fieldnum := 0; fieldnum < v.NumField(); fieldnum++ {
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// always add spaces if we're doing println
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field := getField(v, fieldnum);
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if fieldnum > 0 {
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if addspace {
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p.add(' ')
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} else if field.Kind() != reflect.StringKind && !prev_string{
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// if not doing println, add spaces if neither side is a string
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p.add(' ')
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_, is_string := field.(*reflect.StringValue);
|
||||
if addspace || !is_string && !prev_string {
|
||||
p.add(' ');
|
||||
}
|
||||
}
|
||||
was_string := p.printField(field);
|
||||
prev_string = was_string;
|
||||
prev_string = p.printField(field);
|
||||
}
|
||||
if addnewline {
|
||||
p.add('\n')
|
||||
|
||||
Loading…
Reference in New Issue
Block a user