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https://github.com/golang/go
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printf as we know and love it.
Plus print[ln] with the ability to print struct values. Note for language mavens: if a "..." function passes its argument to another "..." function, the argument is not wrapped again. This allows printf to call fprintf without extra manipulation. It's good but needs to go in the spec. This code works: /// package main import fmt "fmt" import os "os" type T struct { s string; a, b int } func main() { P := fmt.Printer(); P.printf("%s = %d with float value %.4f\n", "hi there", 7, 123.456); P.println("hi there", 7, 123.456); P.fprintf(os.Stdout, "%s = %d with float value %.4f\n", "hi there", 7, 123.456); P.println(T{"x", 7, 234}, "end of struct", 8, 9); } R=rsc DELTA=28 (7 added, 3 deleted, 18 changed) OCL=18321 CL=18324
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@ -83,11 +83,11 @@ export type Writer interface {
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}
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func (p *P) doprintf(format string, v reflect.StructValue);
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func (p *P) doprint(v reflect.StructValue, addspace bool);
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func (p *P) 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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func (p *P) fprintf(w Writer, format string, a reflect.Empty) (n int, error *os.Error) {
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func (p *P) fprintf(w Writer, format string, a ...) (n int, error *os.Error) {
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v := reflect.NewValue(a).(reflect.PtrValue).Sub().(reflect.StructValue);
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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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@ -95,12 +95,12 @@ func (p *P) fprintf(w Writer, format string, a reflect.Empty) (n int, error *os.
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return n, error;
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}
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func (p *P) printf(format string, v reflect.Empty) (n int, errno *os.Error) {
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func (p *P) printf(format string, v ...) (n int, errno *os.Error) {
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n, errno = p.fprintf(os.Stdout, format, v);
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return n, errno;
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}
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func (p *P) sprintf(format string, v reflect.Empty) string {
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func (p *P) sprintf(format string, v ...) string {
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p.doprintf(format, reflect.NewValue(v).(reflect.StructValue));
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s := string(p.buf)[0 : p.n];
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p.reset();
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@ -110,21 +110,21 @@ func (p *P) sprintf(format string, v reflect.Empty) string {
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// These routines do not take a format string and add spaces only
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// when the operand on neither side is a string.
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func (p *P) fprint(w Writer, a reflect.Empty) (n int, error *os.Error) {
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func (p *P) fprint(w Writer, a ...) (n int, error *os.Error) {
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v := reflect.NewValue(a).(reflect.PtrValue).Sub().(reflect.StructValue);
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p.doprint(v, false);
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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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p.reset();
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return n, error;
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}
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func (p *P) print(v reflect.Empty) (n int, errno *os.Error) {
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func (p *P) print(v ...) (n int, errno *os.Error) {
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n, errno = p.fprint(os.Stdout, v);
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return n, errno;
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}
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func (p *P) sprint(v reflect.Empty) string {
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p.doprint(reflect.NewValue(v).(reflect.StructValue), false);
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func (p *P) sprint(v ...) string {
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p.doprint(reflect.NewValue(v).(reflect.StructValue), false, false);
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s := string(p.buf)[0 : p.n];
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p.reset();
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return s;
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@ -134,21 +134,21 @@ func (p *P) sprint(v reflect.Empty) string {
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// always add spaces between operands, and add a newline
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// after the last operand.
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func (p *P) fprintln(w Writer, a reflect.Empty) (n int, error *os.Error) {
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func (p *P) fprintln(w Writer, a ...) (n int, error *os.Error) {
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v := reflect.NewValue(a).(reflect.PtrValue).Sub().(reflect.StructValue);
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p.doprint(v, true);
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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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p.reset();
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return n, error;
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}
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func (p *P) println(v reflect.Empty) (n int, errno *os.Error) {
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func (p *P) println(v ...) (n int, errno *os.Error) {
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n, errno = p.fprintln(os.Stdout, v);
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return n, errno;
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}
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func (p *P) sprintln(v reflect.Empty) string {
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p.doprint(reflect.NewValue(v).(reflect.StructValue), true);
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func (p *P) sprintln(v ...) string {
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p.doprint(reflect.NewValue(v).(reflect.StructValue), true, true);
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s := string(p.buf)[0 : p.n];
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p.reset();
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return s;
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@ -362,19 +362,19 @@ func (p *P) doprintf(format string, v reflect.StructValue) {
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}
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}
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func (p *P) doprint(v reflect.StructValue, is_println bool) {
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func (p *P) 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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// always add spaces if we're doing println
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field := v.Field(fieldnum);
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s := "";
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if is_println {
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if fieldnum > 0 {
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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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}
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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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}
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switch field.Kind() {
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case reflect.BoolKind:
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@ -396,13 +396,17 @@ func (p *P) doprint(v reflect.StructValue, is_println bool) {
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p.add('0');
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p.add('x');
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s = p.fmt.uX64(v).str();
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case reflect.StructKind:
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p.add('{');
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p.doprint(field, true, false);
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p.add('}');
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default:
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s = "???";
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}
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p.addstr(s);
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prev_string = field.Kind() == reflect.StringKind;
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}
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if is_println {
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if addnewline {
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p.add('\n')
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}
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}
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