948 lines
23 KiB
Go
948 lines
23 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package fmt
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import (
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"bytes"
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"io"
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"os"
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"reflect"
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"utf8"
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)
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// Some constants in the form of bytes, to avoid string overhead.
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// Needlessly fastidious, I suppose.
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var (
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commaSpaceBytes = []byte(", ")
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nilAngleBytes = []byte("<nil>")
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nilParenBytes = []byte("(nil)")
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nilBytes = []byte("nil")
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mapBytes = []byte("map[")
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missingBytes = []byte("(MISSING)")
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extraBytes = []byte("%!(EXTRA ")
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irparenBytes = []byte("i)")
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bytesBytes = []byte("[]byte{")
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widthBytes = []byte("%!(BADWIDTH)")
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precBytes = []byte("%!(BADPREC)")
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noVerbBytes = []byte("%!(NOVERB)")
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)
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// State represents the printer state passed to custom formatters.
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// It provides access to the io.Writer interface plus information about
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// the flags and options for the operand's format specifier.
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type State interface {
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// Write is the function to call to emit formatted output to be printed.
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Write(b []byte) (ret int, err os.Error)
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// Width returns the value of the width option and whether it has been set.
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Width() (wid int, ok bool)
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// Precision returns the value of the precision option and whether it has been set.
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Precision() (prec int, ok bool)
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// Flag returns whether the flag c, a character, has been set.
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Flag(int) bool
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}
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// Formatter is the interface implemented by values with a custom formatter.
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// The implementation of Format may call Sprintf or Fprintf(f) etc.
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// to generate its output.
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type Formatter interface {
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Format(f State, c int)
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}
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// Stringer is implemented by any value that has a String method(),
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// which defines the ``native'' format for that value.
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// The String method is used to print values passed as an operand
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// to a %s or %v format or to an unformatted printer such as Print.
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type Stringer interface {
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String() string
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}
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// GoStringer is implemented by any value that has a GoString() method,
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// which defines the Go syntax for that value.
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// The GoString method is used to print values passed as an operand
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// to a %#v format.
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type GoStringer interface {
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GoString() string
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}
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type pp struct {
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n int
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buf bytes.Buffer
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runeBuf [utf8.UTFMax]byte
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fmt fmt
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}
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// A cache holds a set of reusable objects.
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// The buffered channel holds the currently available objects.
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// If more are needed, the cache creates them by calling new.
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type cache struct {
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saved chan interface{}
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new func() interface{}
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}
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func (c *cache) put(x interface{}) {
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select {
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case c.saved <- x:
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// saved in cache
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default:
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// discard
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}
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}
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func (c *cache) get() interface{} {
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select {
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case x := <-c.saved:
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return x // reused from cache
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default:
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return c.new()
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}
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panic("not reached")
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}
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func newCache(f func() interface{}) *cache {
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return &cache{make(chan interface{}, 100), f}
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}
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var ppFree = newCache(func() interface{} { return new(pp) })
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// Allocate a new pp struct or grab a cached one.
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func newPrinter() *pp {
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p := ppFree.get().(*pp)
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p.fmt.init(&p.buf)
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return p
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}
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// Save used pp structs in ppFree; avoids an allocation per invocation.
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func (p *pp) free() {
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// Don't hold on to pp structs with large buffers.
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if cap(p.buf.Bytes()) > 1024 {
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return
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}
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p.buf.Reset()
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ppFree.put(p)
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}
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func (p *pp) Width() (wid int, ok bool) { return p.fmt.wid, p.fmt.widPresent }
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func (p *pp) Precision() (prec int, ok bool) { return p.fmt.prec, p.fmt.precPresent }
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func (p *pp) Flag(b int) bool {
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switch b {
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case '-':
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return p.fmt.minus
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case '+':
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return p.fmt.plus
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case '#':
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return p.fmt.sharp
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case ' ':
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return p.fmt.space
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case '0':
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return p.fmt.zero
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}
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return false
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}
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func (p *pp) add(c int) {
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p.buf.WriteRune(c)
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}
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// Implement Write so we can call Fprintf on a pp (through State), for
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// recursive use in custom verbs.
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func (p *pp) Write(b []byte) (ret int, err os.Error) {
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return p.buf.Write(b)
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}
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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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// It returns the number of bytes written and any write error encountered.
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func Fprintf(w io.Writer, format string, a ...interface{}) (n int, error os.Error) {
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p := newPrinter()
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p.doPrintf(format, a)
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n64, error := p.buf.WriteTo(w)
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p.free()
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return int(n64), error
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}
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// Printf formats according to a format specifier and writes to standard output.
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// It returns the number of bytes written and any write error encountered.
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func Printf(format string, a ...interface{}) (n int, errno os.Error) {
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n, errno = Fprintf(os.Stdout, format, a...)
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return n, errno
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}
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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 ...interface{}) string {
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p := newPrinter()
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p.doPrintf(format, a)
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s := p.buf.String()
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p.free()
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return s
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}
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// Errorf formats according to a format specifier and returns the string
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// converted to an os.ErrorString, which satisfies the os.Error interface.
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func Errorf(format string, a ...interface{}) os.Error {
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return os.ErrorString(Sprintf(format, a...))
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}
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// These routines do not take a format 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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// It returns the number of bytes written and any write error encountered.
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func Fprint(w io.Writer, a ...interface{}) (n int, error os.Error) {
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p := newPrinter()
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p.doPrint(a, false, false)
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n64, error := p.buf.WriteTo(w)
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p.free()
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return int(n64), error
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}
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// Print formats using the default formats for its operands and writes to standard output.
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// Spaces are added between operands when neither is a string.
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// It returns the number of bytes written and any write error encountered.
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func Print(a ...interface{}) (n int, errno os.Error) {
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n, errno = Fprint(os.Stdout, a...)
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return n, errno
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}
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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 ...interface{}) string {
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p := newPrinter()
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p.doPrint(a, false, false)
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s := p.buf.String()
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p.free()
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return s
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}
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// These routines end in 'ln', do not take a format 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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// 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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// It returns the number of bytes written and any write error encountered.
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func Fprintln(w io.Writer, a ...interface{}) (n int, error os.Error) {
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p := newPrinter()
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p.doPrint(a, true, true)
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n64, error := p.buf.WriteTo(w)
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p.free()
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return int(n64), error
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}
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// Println formats using the default formats for its operands and writes to standard output.
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// Spaces are always added between operands and a newline is appended.
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// It returns the number of bytes written and any write error encountered.
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func Println(a ...interface{}) (n int, errno os.Error) {
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n, errno = Fprintln(os.Stdout, a...)
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return n, errno
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}
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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 ...interface{}) string {
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p := newPrinter()
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p.doPrint(a, true, true)
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s := p.buf.String()
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p.free()
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return s
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}
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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.Value, i int) reflect.Value {
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val := v.Field(i)
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if i := val; i.Kind() == reflect.Interface {
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if inter := i.Interface(); inter != nil {
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return reflect.ValueOf(inter)
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}
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}
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return val
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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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func parsenum(s string, start, end int) (num int, isnum bool, newi int) {
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if start >= end {
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return 0, false, end
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}
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for newi = start; newi < end && '0' <= s[newi] && s[newi] <= '9'; newi++ {
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num = num*10 + int(s[newi]-'0')
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isnum = true
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}
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return
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}
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func (p *pp) unknownType(v interface{}) {
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if v == nil {
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p.buf.Write(nilAngleBytes)
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return
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}
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p.buf.WriteByte('?')
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p.buf.WriteString(reflect.TypeOf(v).String())
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p.buf.WriteByte('?')
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}
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func (p *pp) badVerb(verb int, val interface{}) {
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p.add('%')
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p.add('!')
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p.add(verb)
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p.add('(')
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if val == nil {
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p.buf.Write(nilAngleBytes)
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} else {
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p.buf.WriteString(reflect.TypeOf(val).String())
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p.add('=')
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p.printField(val, 'v', false, false, 0)
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}
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p.add(')')
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}
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func (p *pp) fmtBool(v bool, verb int, value interface{}) {
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switch verb {
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case 't', 'v':
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p.fmt.fmt_boolean(v)
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default:
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p.badVerb(verb, value)
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}
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}
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// fmtC formats a rune for the 'c' format.
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func (p *pp) fmtC(c int64) {
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rune := int(c) // Check for overflow.
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if int64(rune) != c {
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rune = utf8.RuneError
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}
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w := utf8.EncodeRune(p.runeBuf[0:utf8.UTFMax], rune)
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p.fmt.pad(p.runeBuf[0:w])
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}
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func (p *pp) fmtInt64(v int64, verb int, value interface{}) {
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switch verb {
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case 'b':
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p.fmt.integer(v, 2, signed, ldigits)
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case 'c':
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p.fmtC(v)
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case 'd', 'v':
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p.fmt.integer(v, 10, signed, ldigits)
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case 'o':
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p.fmt.integer(v, 8, signed, ldigits)
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case 'x':
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p.fmt.integer(v, 16, signed, ldigits)
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case 'U':
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p.fmtUnicode(v)
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case 'X':
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p.fmt.integer(v, 16, signed, udigits)
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default:
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p.badVerb(verb, value)
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}
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}
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// fmt0x64 formats a uint64 in hexadecimal and prefixes it with 0x or
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// not, as requested, by temporarily setting the sharp flag.
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func (p *pp) fmt0x64(v uint64, leading0x bool) {
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sharp := p.fmt.sharp
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p.fmt.sharp = leading0x
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p.fmt.integer(int64(v), 16, unsigned, ldigits)
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p.fmt.sharp = sharp
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}
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// fmtUnicode formats a uint64 in U+1234 form by
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// temporarily turning on the unicode flag and tweaking the precision.
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func (p *pp) fmtUnicode(v int64) {
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precPresent := p.fmt.precPresent
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prec := p.fmt.prec
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if !precPresent {
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// If prec is already set, leave it alone; otherwise 4 is minimum.
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p.fmt.prec = 4
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p.fmt.precPresent = true
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}
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p.fmt.unicode = true // turn on U+
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p.fmt.integer(int64(v), 16, unsigned, udigits)
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p.fmt.unicode = false
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p.fmt.prec = prec
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p.fmt.precPresent = precPresent
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}
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func (p *pp) fmtUint64(v uint64, verb int, goSyntax bool, value interface{}) {
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switch verb {
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case 'b':
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p.fmt.integer(int64(v), 2, unsigned, ldigits)
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case 'c':
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p.fmtC(int64(v))
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case 'd':
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p.fmt.integer(int64(v), 10, unsigned, ldigits)
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case 'v':
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if goSyntax {
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p.fmt0x64(v, true)
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} else {
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p.fmt.integer(int64(v), 10, unsigned, ldigits)
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}
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case 'o':
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p.fmt.integer(int64(v), 8, unsigned, ldigits)
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case 'x':
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p.fmt.integer(int64(v), 16, unsigned, ldigits)
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case 'X':
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p.fmt.integer(int64(v), 16, unsigned, udigits)
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case 'U':
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p.fmtUnicode(int64(v))
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default:
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p.badVerb(verb, value)
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}
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}
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func (p *pp) fmtFloat32(v float32, verb int, value interface{}) {
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switch verb {
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case 'b':
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p.fmt.fmt_fb32(v)
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case 'e':
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p.fmt.fmt_e32(v)
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case 'E':
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p.fmt.fmt_E32(v)
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case 'f':
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p.fmt.fmt_f32(v)
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case 'g', 'v':
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p.fmt.fmt_g32(v)
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case 'G':
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p.fmt.fmt_G32(v)
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default:
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p.badVerb(verb, value)
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}
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}
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func (p *pp) fmtFloat64(v float64, verb int, value interface{}) {
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switch verb {
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case 'b':
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p.fmt.fmt_fb64(v)
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case 'e':
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p.fmt.fmt_e64(v)
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case 'E':
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p.fmt.fmt_E64(v)
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case 'f':
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p.fmt.fmt_f64(v)
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case 'g', 'v':
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p.fmt.fmt_g64(v)
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case 'G':
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p.fmt.fmt_G64(v)
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default:
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p.badVerb(verb, value)
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}
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}
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func (p *pp) fmtComplex64(v complex64, verb int, value interface{}) {
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switch verb {
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case 'e', 'E', 'f', 'F', 'g', 'G':
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p.fmt.fmt_c64(v, verb)
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case 'v':
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p.fmt.fmt_c64(v, 'g')
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default:
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p.badVerb(verb, value)
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}
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}
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func (p *pp) fmtComplex128(v complex128, verb int, value interface{}) {
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switch verb {
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case 'e', 'E', 'f', 'F', 'g', 'G':
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p.fmt.fmt_c128(v, verb)
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case 'v':
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p.fmt.fmt_c128(v, 'g')
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default:
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p.badVerb(verb, value)
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}
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}
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func (p *pp) fmtString(v string, verb int, goSyntax bool, value interface{}) {
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switch verb {
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case 'v':
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if goSyntax {
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p.fmt.fmt_q(v)
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} else {
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p.fmt.fmt_s(v)
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}
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case 's':
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p.fmt.fmt_s(v)
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case 'x':
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p.fmt.fmt_sx(v)
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case 'X':
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p.fmt.fmt_sX(v)
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case 'q':
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p.fmt.fmt_q(v)
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default:
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p.badVerb(verb, value)
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}
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}
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func (p *pp) fmtBytes(v []byte, verb int, goSyntax bool, depth int, value interface{}) {
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if verb == 'v' || verb == 'd' {
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if goSyntax {
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p.buf.Write(bytesBytes)
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} else {
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p.buf.WriteByte('[')
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}
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for i, c := range v {
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if i > 0 {
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|
if goSyntax {
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|
p.buf.Write(commaSpaceBytes)
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|
} else {
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p.buf.WriteByte(' ')
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}
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}
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p.printField(c, 'v', p.fmt.plus, goSyntax, depth+1)
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}
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if goSyntax {
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p.buf.WriteByte('}')
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} else {
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p.buf.WriteByte(']')
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}
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return
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}
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s := string(v)
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switch verb {
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case 's':
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p.fmt.fmt_s(s)
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case 'x':
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p.fmt.fmt_sx(s)
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case 'X':
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p.fmt.fmt_sX(s)
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case 'q':
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p.fmt.fmt_q(s)
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default:
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p.badVerb(verb, value)
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}
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}
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|
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func (p *pp) fmtPointer(field interface{}, value reflect.Value, verb int, goSyntax bool) {
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var u uintptr
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switch value.Kind() {
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|
case reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr, reflect.Slice, reflect.UnsafePointer:
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u = value.Pointer()
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default:
|
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p.badVerb(verb, field)
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return
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}
|
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if goSyntax {
|
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p.add('(')
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p.buf.WriteString(reflect.TypeOf(field).String())
|
|
p.add(')')
|
|
p.add('(')
|
|
if u == 0 {
|
|
p.buf.Write(nilBytes)
|
|
} else {
|
|
p.fmt0x64(uint64(u), true)
|
|
}
|
|
p.add(')')
|
|
} else {
|
|
p.fmt0x64(uint64(u), !p.fmt.sharp)
|
|
}
|
|
}
|
|
|
|
var (
|
|
intBits = reflect.TypeOf(0).Bits()
|
|
floatBits = reflect.TypeOf(0.0).Bits()
|
|
complexBits = reflect.TypeOf(1i).Bits()
|
|
uintptrBits = reflect.TypeOf(uintptr(0)).Bits()
|
|
)
|
|
|
|
func (p *pp) printField(field interface{}, verb int, plus, goSyntax bool, depth int) (wasString bool) {
|
|
if field == nil {
|
|
if verb == 'T' || verb == 'v' {
|
|
p.buf.Write(nilAngleBytes)
|
|
} else {
|
|
p.badVerb(verb, field)
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Special processing considerations.
|
|
// %T (the value's type) and %p (its address) are special; we always do them first.
|
|
switch verb {
|
|
case 'T':
|
|
p.printField(reflect.TypeOf(field).String(), 's', false, false, 0)
|
|
return false
|
|
case 'p':
|
|
p.fmtPointer(field, reflect.ValueOf(field), verb, goSyntax)
|
|
return false
|
|
}
|
|
// Is it a Formatter?
|
|
if formatter, ok := field.(Formatter); ok {
|
|
formatter.Format(p, verb)
|
|
return false // this value is not a string
|
|
|
|
}
|
|
// Must not touch flags before Formatter looks at them.
|
|
if plus {
|
|
p.fmt.plus = false
|
|
}
|
|
// If we're doing Go syntax and the field knows how to supply it, take care of it now.
|
|
if goSyntax {
|
|
p.fmt.sharp = false
|
|
if stringer, ok := field.(GoStringer); ok {
|
|
// Print the result of GoString unadorned.
|
|
p.fmtString(stringer.GoString(), 's', false, field)
|
|
return false // this value is not a string
|
|
}
|
|
} else {
|
|
// Is it a Stringer?
|
|
if stringer, ok := field.(Stringer); ok {
|
|
p.printField(stringer.String(), verb, plus, false, depth)
|
|
return false // this value is not a string
|
|
}
|
|
}
|
|
|
|
// Some types can be done without reflection.
|
|
switch f := field.(type) {
|
|
case bool:
|
|
p.fmtBool(f, verb, field)
|
|
return false
|
|
case float32:
|
|
p.fmtFloat32(f, verb, field)
|
|
return false
|
|
case float64:
|
|
p.fmtFloat64(f, verb, field)
|
|
return false
|
|
case complex64:
|
|
p.fmtComplex64(complex64(f), verb, field)
|
|
return false
|
|
case complex128:
|
|
p.fmtComplex128(f, verb, field)
|
|
return false
|
|
case int:
|
|
p.fmtInt64(int64(f), verb, field)
|
|
return false
|
|
case int8:
|
|
p.fmtInt64(int64(f), verb, field)
|
|
return false
|
|
case int16:
|
|
p.fmtInt64(int64(f), verb, field)
|
|
return false
|
|
case int32:
|
|
p.fmtInt64(int64(f), verb, field)
|
|
return false
|
|
case int64:
|
|
p.fmtInt64(f, verb, field)
|
|
return false
|
|
case uint:
|
|
p.fmtUint64(uint64(f), verb, goSyntax, field)
|
|
return false
|
|
case uint8:
|
|
p.fmtUint64(uint64(f), verb, goSyntax, field)
|
|
return false
|
|
case uint16:
|
|
p.fmtUint64(uint64(f), verb, goSyntax, field)
|
|
return false
|
|
case uint32:
|
|
p.fmtUint64(uint64(f), verb, goSyntax, field)
|
|
return false
|
|
case uint64:
|
|
p.fmtUint64(f, verb, goSyntax, field)
|
|
return false
|
|
case uintptr:
|
|
p.fmtUint64(uint64(f), verb, goSyntax, field)
|
|
return false
|
|
case string:
|
|
p.fmtString(f, verb, goSyntax, field)
|
|
return verb == 's' || verb == 'v'
|
|
case []byte:
|
|
p.fmtBytes(f, verb, goSyntax, depth, field)
|
|
return verb == 's'
|
|
}
|
|
|
|
// Need to use reflection
|
|
value := reflect.ValueOf(field)
|
|
|
|
BigSwitch:
|
|
switch f := value; f.Kind() {
|
|
case reflect.Bool:
|
|
p.fmtBool(f.Bool(), verb, field)
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
p.fmtInt64(f.Int(), verb, field)
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
p.fmtUint64(uint64(f.Uint()), verb, goSyntax, field)
|
|
case reflect.Float32, reflect.Float64:
|
|
if f.Type().Size() == 4 {
|
|
p.fmtFloat32(float32(f.Float()), verb, field)
|
|
} else {
|
|
p.fmtFloat64(float64(f.Float()), verb, field)
|
|
}
|
|
case reflect.Complex64, reflect.Complex128:
|
|
if f.Type().Size() == 8 {
|
|
p.fmtComplex64(complex64(f.Complex()), verb, field)
|
|
} else {
|
|
p.fmtComplex128(complex128(f.Complex()), verb, field)
|
|
}
|
|
case reflect.String:
|
|
p.fmtString(f.String(), verb, goSyntax, field)
|
|
case reflect.Map:
|
|
if goSyntax {
|
|
p.buf.WriteString(f.Type().String())
|
|
p.buf.WriteByte('{')
|
|
} else {
|
|
p.buf.Write(mapBytes)
|
|
}
|
|
keys := f.MapKeys()
|
|
for i, key := range keys {
|
|
if i > 0 {
|
|
if goSyntax {
|
|
p.buf.Write(commaSpaceBytes)
|
|
} else {
|
|
p.buf.WriteByte(' ')
|
|
}
|
|
}
|
|
p.printField(key.Interface(), verb, plus, goSyntax, depth+1)
|
|
p.buf.WriteByte(':')
|
|
p.printField(f.MapIndex(key).Interface(), verb, plus, goSyntax, depth+1)
|
|
}
|
|
if goSyntax {
|
|
p.buf.WriteByte('}')
|
|
} else {
|
|
p.buf.WriteByte(']')
|
|
}
|
|
case reflect.Struct:
|
|
if goSyntax {
|
|
p.buf.WriteString(reflect.TypeOf(field).String())
|
|
}
|
|
p.add('{')
|
|
v := f
|
|
t := v.Type()
|
|
for i := 0; i < v.NumField(); i++ {
|
|
if i > 0 {
|
|
if goSyntax {
|
|
p.buf.Write(commaSpaceBytes)
|
|
} else {
|
|
p.buf.WriteByte(' ')
|
|
}
|
|
}
|
|
if plus || goSyntax {
|
|
if f := t.Field(i); f.Name != "" {
|
|
p.buf.WriteString(f.Name)
|
|
p.buf.WriteByte(':')
|
|
}
|
|
}
|
|
p.printField(getField(v, i).Interface(), verb, plus, goSyntax, depth+1)
|
|
}
|
|
p.buf.WriteByte('}')
|
|
case reflect.Interface:
|
|
value := f.Elem()
|
|
if !value.IsValid() {
|
|
if goSyntax {
|
|
p.buf.WriteString(reflect.TypeOf(field).String())
|
|
p.buf.Write(nilParenBytes)
|
|
} else {
|
|
p.buf.Write(nilAngleBytes)
|
|
}
|
|
} else {
|
|
return p.printField(value.Interface(), verb, plus, goSyntax, depth+1)
|
|
}
|
|
case reflect.Array, reflect.Slice:
|
|
// Byte slices are special.
|
|
if f.Type().Elem().Kind() == reflect.Uint8 {
|
|
// We know it's a slice of bytes, but we also know it does not have static type
|
|
// []byte, or it would have been caught above. Therefore we cannot convert
|
|
// it directly in the (slightly) obvious way: f.Interface().([]byte); it doesn't have
|
|
// that type, and we can't write an expression of the right type and do a
|
|
// conversion because we don't have a static way to write the right type.
|
|
// So we build a slice by hand. This is a rare case but it would be nice
|
|
// if reflection could help a little more.
|
|
bytes := make([]byte, f.Len())
|
|
for i := range bytes {
|
|
bytes[i] = byte(f.Index(i).Uint())
|
|
}
|
|
p.fmtBytes(bytes, verb, goSyntax, depth, field)
|
|
return verb == 's'
|
|
}
|
|
if goSyntax {
|
|
p.buf.WriteString(reflect.TypeOf(field).String())
|
|
p.buf.WriteByte('{')
|
|
} else {
|
|
p.buf.WriteByte('[')
|
|
}
|
|
for i := 0; i < f.Len(); i++ {
|
|
if i > 0 {
|
|
if goSyntax {
|
|
p.buf.Write(commaSpaceBytes)
|
|
} else {
|
|
p.buf.WriteByte(' ')
|
|
}
|
|
}
|
|
p.printField(f.Index(i).Interface(), verb, plus, goSyntax, depth+1)
|
|
}
|
|
if goSyntax {
|
|
p.buf.WriteByte('}')
|
|
} else {
|
|
p.buf.WriteByte(']')
|
|
}
|
|
case reflect.Ptr:
|
|
v := f.Pointer()
|
|
// pointer to array or slice or struct? ok at top level
|
|
// but not embedded (avoid loops)
|
|
if v != 0 && depth == 0 {
|
|
switch a := f.Elem(); a.Kind() {
|
|
case reflect.Array, reflect.Slice:
|
|
p.buf.WriteByte('&')
|
|
p.printField(a.Interface(), verb, plus, goSyntax, depth+1)
|
|
break BigSwitch
|
|
case reflect.Struct:
|
|
p.buf.WriteByte('&')
|
|
p.printField(a.Interface(), verb, plus, goSyntax, depth+1)
|
|
break BigSwitch
|
|
}
|
|
}
|
|
if goSyntax {
|
|
p.buf.WriteByte('(')
|
|
p.buf.WriteString(reflect.TypeOf(field).String())
|
|
p.buf.WriteByte(')')
|
|
p.buf.WriteByte('(')
|
|
if v == 0 {
|
|
p.buf.Write(nilBytes)
|
|
} else {
|
|
p.fmt0x64(uint64(v), true)
|
|
}
|
|
p.buf.WriteByte(')')
|
|
break
|
|
}
|
|
if v == 0 {
|
|
p.buf.Write(nilAngleBytes)
|
|
break
|
|
}
|
|
p.fmt0x64(uint64(v), true)
|
|
case reflect.Chan, reflect.Func, reflect.UnsafePointer:
|
|
p.fmtPointer(field, value, verb, goSyntax)
|
|
default:
|
|
p.unknownType(f)
|
|
}
|
|
return false
|
|
}
|
|
|
|
// intFromArg gets the fieldnumth element of a. On return, isInt reports whether the argument has type int.
|
|
func intFromArg(a []interface{}, end, i, fieldnum int) (num int, isInt bool, newi, newfieldnum int) {
|
|
newi, newfieldnum = end, fieldnum
|
|
if i < end && fieldnum < len(a) {
|
|
num, isInt = a[fieldnum].(int)
|
|
newi, newfieldnum = i+1, fieldnum+1
|
|
}
|
|
return
|
|
}
|
|
|
|
func (p *pp) doPrintf(format string, a []interface{}) {
|
|
end := len(format)
|
|
fieldnum := 0 // we process one field per non-trivial format
|
|
for i := 0; i < end; {
|
|
lasti := i
|
|
for i < end && format[i] != '%' {
|
|
i++
|
|
}
|
|
if i > lasti {
|
|
p.buf.WriteString(format[lasti:i])
|
|
}
|
|
if i >= end {
|
|
// done processing format string
|
|
break
|
|
}
|
|
|
|
// Process one verb
|
|
i++
|
|
// flags and widths
|
|
p.fmt.clearflags()
|
|
F:
|
|
for ; i < end; i++ {
|
|
switch format[i] {
|
|
case '#':
|
|
p.fmt.sharp = true
|
|
case '0':
|
|
p.fmt.zero = true
|
|
case '+':
|
|
p.fmt.plus = true
|
|
case '-':
|
|
p.fmt.minus = true
|
|
case ' ':
|
|
p.fmt.space = true
|
|
default:
|
|
break F
|
|
}
|
|
}
|
|
// do we have width?
|
|
if i < end && format[i] == '*' {
|
|
p.fmt.wid, p.fmt.widPresent, i, fieldnum = intFromArg(a, end, i, fieldnum)
|
|
if !p.fmt.widPresent {
|
|
p.buf.Write(widthBytes)
|
|
}
|
|
} else {
|
|
p.fmt.wid, p.fmt.widPresent, i = parsenum(format, i, end)
|
|
}
|
|
// do we have precision?
|
|
if i < end && format[i] == '.' {
|
|
if format[i+1] == '*' {
|
|
p.fmt.prec, p.fmt.precPresent, i, fieldnum = intFromArg(a, end, i+1, fieldnum)
|
|
if !p.fmt.precPresent {
|
|
p.buf.Write(precBytes)
|
|
}
|
|
} else {
|
|
p.fmt.prec, p.fmt.precPresent, i = parsenum(format, i+1, end)
|
|
}
|
|
}
|
|
if i >= end {
|
|
p.buf.Write(noVerbBytes)
|
|
continue
|
|
}
|
|
c, w := utf8.DecodeRuneInString(format[i:])
|
|
i += w
|
|
// percent is special - absorbs no operand
|
|
if c == '%' {
|
|
p.buf.WriteByte('%') // We ignore width and prec.
|
|
continue
|
|
}
|
|
if fieldnum >= len(a) { // out of operands
|
|
p.buf.WriteByte('%')
|
|
p.add(c)
|
|
p.buf.Write(missingBytes)
|
|
continue
|
|
}
|
|
field := a[fieldnum]
|
|
fieldnum++
|
|
|
|
goSyntax := c == 'v' && p.fmt.sharp
|
|
plus := c == 'v' && p.fmt.plus
|
|
p.printField(field, c, plus, goSyntax, 0)
|
|
}
|
|
|
|
if fieldnum < len(a) {
|
|
p.buf.Write(extraBytes)
|
|
for ; fieldnum < len(a); fieldnum++ {
|
|
field := a[fieldnum]
|
|
if field != nil {
|
|
p.buf.WriteString(reflect.TypeOf(field).String())
|
|
p.buf.WriteByte('=')
|
|
}
|
|
p.printField(field, 'v', false, false, 0)
|
|
if fieldnum+1 < len(a) {
|
|
p.buf.Write(commaSpaceBytes)
|
|
}
|
|
}
|
|
p.buf.WriteByte(')')
|
|
}
|
|
}
|
|
|
|
func (p *pp) doPrint(a []interface{}, addspace, addnewline bool) {
|
|
prevString := false
|
|
for fieldnum := 0; fieldnum < len(a); fieldnum++ {
|
|
p.fmt.clearflags()
|
|
// always add spaces if we're doing println
|
|
field := a[fieldnum]
|
|
if fieldnum > 0 {
|
|
isString := field != nil && reflect.TypeOf(field).Kind() == reflect.String
|
|
if addspace || !isString && !prevString {
|
|
p.buf.WriteByte(' ')
|
|
}
|
|
}
|
|
prevString = p.printField(field, 'v', false, false, 0)
|
|
}
|
|
if addnewline {
|
|
p.buf.WriteByte('\n')
|
|
}
|
|
}
|