1194 lines
29 KiB
Go
1194 lines
29 KiB
Go
// Copyright 2017 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 message
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import (
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"bytes"
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"fmt" // TODO: consider copying interfaces from package fmt to avoid dependency.
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"math"
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"reflect"
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"unicode/utf8"
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"golang.org/x/text/internal/format"
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"golang.org/x/text/internal/number"
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"golang.org/x/text/language"
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"golang.org/x/text/message/catalog"
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)
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// Strings for use with buffer.WriteString.
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// This is less overhead than using buffer.Write with byte arrays.
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const (
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commaSpaceString = ", "
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nilAngleString = "<nil>"
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nilParenString = "(nil)"
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nilString = "nil"
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mapString = "map["
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percentBangString = "%!"
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missingString = "(MISSING)"
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badIndexString = "(BADINDEX)"
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panicString = "(PANIC="
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extraString = "%!(EXTRA "
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badWidthString = "%!(BADWIDTH)"
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badPrecString = "%!(BADPREC)"
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noVerbString = "%!(NOVERB)"
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invReflectString = "<invalid reflect.Value>"
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)
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// printer is used to store a printer's state.
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// It implements "golang.org/x/text/internal/format".State.
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type printer struct {
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// the context for looking up message translations
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catContext *catalog.Context
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// the language
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tag language.Tag
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// buffer for accumulating output.
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bytes.Buffer
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// retain arguments across calls.
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args []interface{}
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// retain current argument number across calls
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argNum int
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// arg holds the current item, as an interface{}.
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arg interface{}
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// value is used instead of arg for reflect values.
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value reflect.Value
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// fmt is used to format basic items such as integers or strings.
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fmt formatInfo
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// reordered records whether the format string used argument reordering.
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reordered bool
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// goodArgNum records whether the most recent reordering directive was valid.
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goodArgNum bool
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// panicking is set by catchPanic to avoid infinite panic, recover, panic, ... recursion.
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panicking bool
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// erroring is set when printing an error string to guard against calling handleMethods.
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erroring bool
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toDecimal number.Formatter
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toScientific number.Formatter
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}
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func (p *printer) reset() {
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p.Buffer.Reset()
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p.argNum = 0
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p.reordered = false
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p.panicking = false
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p.erroring = false
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p.fmt.init(&p.Buffer)
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}
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// Language implements "golang.org/x/text/internal/format".State.
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func (p *printer) Language() language.Tag { return p.tag }
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func (p *printer) Width() (wid int, ok bool) { return p.fmt.wid, p.fmt.widPresent }
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func (p *printer) Precision() (prec int, ok bool) { return p.fmt.prec, p.fmt.precPresent }
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func (p *printer) 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 || p.fmt.plusV
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case '#':
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return p.fmt.sharp || p.fmt.sharpV
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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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// getField gets the i'th field of the struct value.
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// If the field is 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 val.Kind() == reflect.Interface && !val.IsNil() {
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val = val.Elem()
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}
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return val
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}
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// tooLarge reports whether the magnitude of the integer is
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// too large to be used as a formatting width or precision.
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func tooLarge(x int) bool {
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const max int = 1e6
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return x > max || x < -max
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}
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// parsenum converts ASCII to integer. num is 0 (and isnum 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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if tooLarge(num) {
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return 0, false, end // Overflow; crazy long number most likely.
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}
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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 *printer) unknownType(v reflect.Value) {
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if !v.IsValid() {
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p.WriteString(nilAngleString)
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return
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}
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p.WriteByte('?')
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p.WriteString(v.Type().String())
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p.WriteByte('?')
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}
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func (p *printer) badVerb(verb rune) {
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p.erroring = true
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p.WriteString(percentBangString)
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p.WriteRune(verb)
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p.WriteByte('(')
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switch {
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case p.arg != nil:
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p.WriteString(reflect.TypeOf(p.arg).String())
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p.WriteByte('=')
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p.printArg(p.arg, 'v')
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case p.value.IsValid():
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p.WriteString(p.value.Type().String())
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p.WriteByte('=')
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p.printValue(p.value, 'v', 0)
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default:
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p.WriteString(nilAngleString)
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}
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p.WriteByte(')')
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p.erroring = false
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}
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func (p *printer) fmtBool(v bool, verb rune) {
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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)
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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 *printer) 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.fmt_integer(v, 16, unsigned, ldigits)
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p.fmt.sharp = sharp
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}
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// fmtInteger formats a signed or unsigned integer.
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func (p *printer) fmtInteger(v uint64, isSigned bool, verb rune) {
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switch verb {
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case 'v':
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if p.fmt.sharpV && !isSigned {
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p.fmt0x64(v, true)
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return
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}
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fallthrough
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case 'd':
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if p.fmt.sharp || p.fmt.sharpV {
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p.fmt.fmt_integer(v, 10, isSigned, ldigits)
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} else {
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p.fmtDecimalInt(v, isSigned)
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}
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case 'b':
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p.fmt.fmt_integer(v, 2, isSigned, ldigits)
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case 'o':
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p.fmt.fmt_integer(v, 8, isSigned, ldigits)
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case 'x':
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p.fmt.fmt_integer(v, 16, isSigned, ldigits)
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case 'X':
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p.fmt.fmt_integer(v, 16, isSigned, udigits)
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case 'c':
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p.fmt.fmt_c(v)
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case 'q':
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if v <= utf8.MaxRune {
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p.fmt.fmt_qc(v)
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} else {
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p.badVerb(verb)
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}
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case 'U':
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p.fmt.fmt_unicode(v)
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default:
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p.badVerb(verb)
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}
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}
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// fmtFloat formats a float. The default precision for each verb
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// is specified as last argument in the call to fmt_float.
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func (p *printer) fmtFloat(v float64, size int, verb rune) {
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switch verb {
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case 'b':
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p.fmt.fmt_float(v, size, verb, -1)
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case 'v':
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verb = 'g'
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fallthrough
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case 'g', 'G':
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if p.fmt.sharp || p.fmt.sharpV {
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p.fmt.fmt_float(v, size, verb, -1)
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} else {
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p.fmtVariableFloat(v, size)
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}
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case 'e', 'E':
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if p.fmt.sharp || p.fmt.sharpV {
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p.fmt.fmt_float(v, size, verb, 6)
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} else {
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p.fmtScientific(v, size, 6)
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}
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case 'f', 'F':
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if p.fmt.sharp || p.fmt.sharpV {
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p.fmt.fmt_float(v, size, verb, 6)
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} else {
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p.fmtDecimalFloat(v, size, 6)
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}
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default:
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p.badVerb(verb)
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}
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}
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func (p *printer) setFlags(f *number.Formatter) {
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f.Flags &^= number.ElideSign
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if p.fmt.plus || p.fmt.space {
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f.Flags |= number.AlwaysSign
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if !p.fmt.plus {
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f.Flags |= number.ElideSign
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}
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} else {
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f.Flags &^= number.AlwaysSign
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}
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}
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func (p *printer) updatePadding(f *number.Formatter) {
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f.Flags &^= number.PadMask
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if p.fmt.minus {
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f.Flags |= number.PadAfterSuffix
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} else {
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f.Flags |= number.PadBeforePrefix
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}
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f.PadRune = ' '
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f.FormatWidth = uint16(p.fmt.wid)
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}
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func (p *printer) initDecimal(minFrac, maxFrac int) {
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f := &p.toDecimal
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f.MinIntegerDigits = 1
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f.MaxIntegerDigits = 0
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f.MinFractionDigits = uint8(minFrac)
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f.MaxFractionDigits = int16(maxFrac)
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p.setFlags(f)
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f.PadRune = 0
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if p.fmt.widPresent {
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if p.fmt.zero {
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wid := p.fmt.wid
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// Use significant integers for this.
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// TODO: this is not the same as width, but so be it.
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if f.MinFractionDigits > 0 {
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wid -= 1 + int(f.MinFractionDigits)
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}
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if p.fmt.plus || p.fmt.space {
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wid--
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}
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if wid > 0 && wid > int(f.MinIntegerDigits) {
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f.MinIntegerDigits = uint8(wid)
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}
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}
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p.updatePadding(f)
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}
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}
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func (p *printer) initScientific(minFrac, maxFrac int) {
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f := &p.toScientific
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if maxFrac < 0 {
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f.SetPrecision(maxFrac)
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} else {
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f.SetPrecision(maxFrac + 1)
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f.MinFractionDigits = uint8(minFrac)
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f.MaxFractionDigits = int16(maxFrac)
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}
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f.MinExponentDigits = 2
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p.setFlags(f)
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f.PadRune = 0
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if p.fmt.widPresent {
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f.Flags &^= number.PadMask
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if p.fmt.zero {
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f.PadRune = f.Digit(0)
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f.Flags |= number.PadAfterPrefix
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} else {
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f.PadRune = ' '
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f.Flags |= number.PadBeforePrefix
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}
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p.updatePadding(f)
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}
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}
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func (p *printer) fmtDecimalInt(v uint64, isSigned bool) {
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var d number.Decimal
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f := &p.toDecimal
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if p.fmt.precPresent {
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p.setFlags(f)
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f.MinIntegerDigits = uint8(p.fmt.prec)
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f.MaxIntegerDigits = 0
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f.MinFractionDigits = 0
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f.MaxFractionDigits = 0
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if p.fmt.widPresent {
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p.updatePadding(f)
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}
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} else {
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p.initDecimal(0, 0)
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}
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d.ConvertInt(p.toDecimal.RoundingContext, isSigned, v)
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out := p.toDecimal.Format([]byte(nil), &d)
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p.Buffer.Write(out)
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}
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func (p *printer) fmtDecimalFloat(v float64, size, prec int) {
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var d number.Decimal
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if p.fmt.precPresent {
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prec = p.fmt.prec
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}
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p.initDecimal(prec, prec)
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d.ConvertFloat(p.toDecimal.RoundingContext, v, size)
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out := p.toDecimal.Format([]byte(nil), &d)
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p.Buffer.Write(out)
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}
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func (p *printer) fmtVariableFloat(v float64, size int) {
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prec := -1
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if p.fmt.precPresent {
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prec = p.fmt.prec
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}
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var d number.Decimal
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p.initScientific(0, prec)
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d.ConvertFloat(p.toScientific.RoundingContext, v, size)
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// Copy logic of 'g' formatting from strconv. It is simplified a bit as
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// we don't have to mind having prec > len(d.Digits).
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shortest := prec < 0
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ePrec := prec
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if shortest {
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prec = len(d.Digits)
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ePrec = 6
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} else if prec == 0 {
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prec = 1
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ePrec = 1
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}
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exp := int(d.Exp) - 1
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if exp < -4 || exp >= ePrec {
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p.initScientific(0, prec)
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out := p.toScientific.Format([]byte(nil), &d)
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p.Buffer.Write(out)
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} else {
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if prec > int(d.Exp) {
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prec = len(d.Digits)
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}
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if prec -= int(d.Exp); prec < 0 {
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prec = 0
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}
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p.initDecimal(0, prec)
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out := p.toDecimal.Format([]byte(nil), &d)
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p.Buffer.Write(out)
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}
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}
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func (p *printer) fmtScientific(v float64, size, prec int) {
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var d number.Decimal
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if p.fmt.precPresent {
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prec = p.fmt.prec
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}
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p.initScientific(prec, prec)
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rc := p.toScientific.RoundingContext
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d.ConvertFloat(rc, v, size)
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out := p.toScientific.Format([]byte(nil), &d)
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p.Buffer.Write(out)
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}
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// fmtComplex formats a complex number v with
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// r = real(v) and j = imag(v) as (r+ji) using
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// fmtFloat for r and j formatting.
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func (p *printer) fmtComplex(v complex128, size int, verb rune) {
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// Make sure any unsupported verbs are found before the
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// calls to fmtFloat to not generate an incorrect error string.
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switch verb {
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case 'v', 'b', 'g', 'G', 'f', 'F', 'e', 'E':
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p.WriteByte('(')
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p.fmtFloat(real(v), size/2, verb)
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// Imaginary part always has a sign.
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if math.IsNaN(imag(v)) {
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// By CLDR's rules, NaNs do not use patterns or signs. As this code
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// relies on AlwaysSign working for imaginary parts, we need to
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// manually handle NaNs.
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f := &p.toScientific
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p.setFlags(f)
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p.updatePadding(f)
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p.setFlags(f)
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nan := f.Symbol(number.SymNan)
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extra := 0
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if w, ok := p.Width(); ok {
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extra = w - utf8.RuneCountInString(nan) - 1
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}
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if f.Flags&number.PadAfterNumber == 0 {
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for ; extra > 0; extra-- {
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p.WriteRune(f.PadRune)
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}
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}
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p.WriteString(f.Symbol(number.SymPlusSign))
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p.WriteString(nan)
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for ; extra > 0; extra-- {
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p.WriteRune(f.PadRune)
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}
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p.WriteString("i)")
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return
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}
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oldPlus := p.fmt.plus
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p.fmt.plus = true
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p.fmtFloat(imag(v), size/2, verb)
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p.WriteString("i)") // TODO: use symbol?
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p.fmt.plus = oldPlus
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default:
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p.badVerb(verb)
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}
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}
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func (p *printer) fmtString(v string, verb rune) {
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switch verb {
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case 'v':
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if p.fmt.sharpV {
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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, ldigits)
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case 'X':
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p.fmt.fmt_sx(v, udigits)
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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)
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}
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}
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func (p *printer) fmtBytes(v []byte, verb rune, typeString string) {
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switch verb {
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case 'v', 'd':
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if p.fmt.sharpV {
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p.WriteString(typeString)
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if v == nil {
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p.WriteString(nilParenString)
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return
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}
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p.WriteByte('{')
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for i, c := range v {
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if i > 0 {
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p.WriteString(commaSpaceString)
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}
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p.fmt0x64(uint64(c), true)
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}
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p.WriteByte('}')
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} else {
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p.WriteByte('[')
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for i, c := range v {
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if i > 0 {
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p.WriteByte(' ')
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}
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p.fmt.fmt_integer(uint64(c), 10, unsigned, ldigits)
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}
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p.WriteByte(']')
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}
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case 's':
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p.fmt.fmt_s(string(v))
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case 'x':
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p.fmt.fmt_bx(v, ldigits)
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case 'X':
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p.fmt.fmt_bx(v, udigits)
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case 'q':
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p.fmt.fmt_q(string(v))
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default:
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p.printValue(reflect.ValueOf(v), verb, 0)
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}
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}
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func (p *printer) fmtPointer(value reflect.Value, verb rune) {
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var u uintptr
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switch value.Kind() {
|
|
case reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr, reflect.Slice, reflect.UnsafePointer:
|
|
u = value.Pointer()
|
|
default:
|
|
p.badVerb(verb)
|
|
return
|
|
}
|
|
|
|
switch verb {
|
|
case 'v':
|
|
if p.fmt.sharpV {
|
|
p.WriteByte('(')
|
|
p.WriteString(value.Type().String())
|
|
p.WriteString(")(")
|
|
if u == 0 {
|
|
p.WriteString(nilString)
|
|
} else {
|
|
p.fmt0x64(uint64(u), true)
|
|
}
|
|
p.WriteByte(')')
|
|
} else {
|
|
if u == 0 {
|
|
p.fmt.padString(nilAngleString)
|
|
} else {
|
|
p.fmt0x64(uint64(u), !p.fmt.sharp)
|
|
}
|
|
}
|
|
case 'p':
|
|
p.fmt0x64(uint64(u), !p.fmt.sharp)
|
|
case 'b', 'o', 'd', 'x', 'X':
|
|
if verb == 'd' {
|
|
p.fmt.sharp = true // Print as standard go. TODO: does this make sense?
|
|
}
|
|
p.fmtInteger(uint64(u), unsigned, verb)
|
|
default:
|
|
p.badVerb(verb)
|
|
}
|
|
}
|
|
|
|
func (p *printer) catchPanic(arg interface{}, verb rune) {
|
|
if err := recover(); err != nil {
|
|
// If it's a nil pointer, just say "<nil>". The likeliest causes are a
|
|
// Stringer that fails to guard against nil or a nil pointer for a
|
|
// value receiver, and in either case, "<nil>" is a nice result.
|
|
if v := reflect.ValueOf(arg); v.Kind() == reflect.Ptr && v.IsNil() {
|
|
p.WriteString(nilAngleString)
|
|
return
|
|
}
|
|
// Otherwise print a concise panic message. Most of the time the panic
|
|
// value will print itself nicely.
|
|
if p.panicking {
|
|
// Nested panics; the recursion in printArg cannot succeed.
|
|
panic(err)
|
|
}
|
|
|
|
oldFlags := p.fmt.fmtFlags
|
|
// For this output we want default behavior.
|
|
p.fmt.clearflags()
|
|
|
|
p.WriteString(percentBangString)
|
|
p.WriteRune(verb)
|
|
p.WriteString(panicString)
|
|
p.panicking = true
|
|
p.printArg(err, 'v')
|
|
p.panicking = false
|
|
p.WriteByte(')')
|
|
|
|
p.fmt.fmtFlags = oldFlags
|
|
}
|
|
}
|
|
|
|
func (p *printer) handleMethods(verb rune) (handled bool) {
|
|
if p.erroring {
|
|
return
|
|
}
|
|
// Is it a Formatter?
|
|
if formatter, ok := p.arg.(format.Formatter); ok {
|
|
handled = true
|
|
defer p.catchPanic(p.arg, verb)
|
|
formatter.Format(p, verb)
|
|
return
|
|
}
|
|
if formatter, ok := p.arg.(fmt.Formatter); ok {
|
|
handled = true
|
|
defer p.catchPanic(p.arg, verb)
|
|
formatter.Format(p, verb)
|
|
return
|
|
}
|
|
|
|
// If we're doing Go syntax and the argument knows how to supply it, take care of it now.
|
|
if p.fmt.sharpV {
|
|
if stringer, ok := p.arg.(fmt.GoStringer); ok {
|
|
handled = true
|
|
defer p.catchPanic(p.arg, verb)
|
|
// Print the result of GoString unadorned.
|
|
p.fmt.fmt_s(stringer.GoString())
|
|
return
|
|
}
|
|
} else {
|
|
// If a string is acceptable according to the format, see if
|
|
// the value satisfies one of the string-valued interfaces.
|
|
// Println etc. set verb to %v, which is "stringable".
|
|
switch verb {
|
|
case 'v', 's', 'x', 'X', 'q':
|
|
// Is it an error or Stringer?
|
|
// The duplication in the bodies is necessary:
|
|
// setting handled and deferring catchPanic
|
|
// must happen before calling the method.
|
|
switch v := p.arg.(type) {
|
|
case error:
|
|
handled = true
|
|
defer p.catchPanic(p.arg, verb)
|
|
p.fmtString(v.Error(), verb)
|
|
return
|
|
|
|
case fmt.Stringer:
|
|
handled = true
|
|
defer p.catchPanic(p.arg, verb)
|
|
p.fmtString(v.String(), verb)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (p *printer) printArg(arg interface{}, verb rune) {
|
|
p.arg = arg
|
|
p.value = reflect.Value{}
|
|
|
|
if arg == nil {
|
|
switch verb {
|
|
case 'T', 'v':
|
|
p.fmt.padString(nilAngleString)
|
|
default:
|
|
p.badVerb(verb)
|
|
}
|
|
return
|
|
}
|
|
|
|
// Special processing considerations.
|
|
// %T (the value's type) and %p (its address) are special; we always do them first.
|
|
switch verb {
|
|
case 'T':
|
|
p.fmt.fmt_s(reflect.TypeOf(arg).String())
|
|
return
|
|
case 'p':
|
|
p.fmtPointer(reflect.ValueOf(arg), 'p')
|
|
return
|
|
}
|
|
|
|
// Some types can be done without reflection.
|
|
switch f := arg.(type) {
|
|
case bool:
|
|
p.fmtBool(f, verb)
|
|
case float32:
|
|
p.fmtFloat(float64(f), 32, verb)
|
|
case float64:
|
|
p.fmtFloat(f, 64, verb)
|
|
case complex64:
|
|
p.fmtComplex(complex128(f), 64, verb)
|
|
case complex128:
|
|
p.fmtComplex(f, 128, verb)
|
|
case int:
|
|
p.fmtInteger(uint64(f), signed, verb)
|
|
case int8:
|
|
p.fmtInteger(uint64(f), signed, verb)
|
|
case int16:
|
|
p.fmtInteger(uint64(f), signed, verb)
|
|
case int32:
|
|
p.fmtInteger(uint64(f), signed, verb)
|
|
case int64:
|
|
p.fmtInteger(uint64(f), signed, verb)
|
|
case uint:
|
|
p.fmtInteger(uint64(f), unsigned, verb)
|
|
case uint8:
|
|
p.fmtInteger(uint64(f), unsigned, verb)
|
|
case uint16:
|
|
p.fmtInteger(uint64(f), unsigned, verb)
|
|
case uint32:
|
|
p.fmtInteger(uint64(f), unsigned, verb)
|
|
case uint64:
|
|
p.fmtInteger(f, unsigned, verb)
|
|
case uintptr:
|
|
p.fmtInteger(uint64(f), unsigned, verb)
|
|
case string:
|
|
p.fmtString(f, verb)
|
|
case []byte:
|
|
p.fmtBytes(f, verb, "[]byte")
|
|
case reflect.Value:
|
|
// Handle extractable values with special methods
|
|
// since printValue does not handle them at depth 0.
|
|
if f.IsValid() && f.CanInterface() {
|
|
p.arg = f.Interface()
|
|
if p.handleMethods(verb) {
|
|
return
|
|
}
|
|
}
|
|
p.printValue(f, verb, 0)
|
|
default:
|
|
// If the type is not simple, it might have methods.
|
|
if !p.handleMethods(verb) {
|
|
// Need to use reflection, since the type had no
|
|
// interface methods that could be used for formatting.
|
|
p.printValue(reflect.ValueOf(f), verb, 0)
|
|
}
|
|
}
|
|
}
|
|
|
|
// printValue is similar to printArg but starts with a reflect value, not an interface{} value.
|
|
// It does not handle 'p' and 'T' verbs because these should have been already handled by printArg.
|
|
func (p *printer) printValue(value reflect.Value, verb rune, depth int) {
|
|
// Handle values with special methods if not already handled by printArg (depth == 0).
|
|
if depth > 0 && value.IsValid() && value.CanInterface() {
|
|
p.arg = value.Interface()
|
|
if p.handleMethods(verb) {
|
|
return
|
|
}
|
|
}
|
|
p.arg = nil
|
|
p.value = value
|
|
|
|
switch f := value; value.Kind() {
|
|
case reflect.Invalid:
|
|
if depth == 0 {
|
|
p.WriteString(invReflectString)
|
|
} else {
|
|
switch verb {
|
|
case 'v':
|
|
p.WriteString(nilAngleString)
|
|
default:
|
|
p.badVerb(verb)
|
|
}
|
|
}
|
|
case reflect.Bool:
|
|
p.fmtBool(f.Bool(), verb)
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
p.fmtInteger(uint64(f.Int()), signed, verb)
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
p.fmtInteger(f.Uint(), unsigned, verb)
|
|
case reflect.Float32:
|
|
p.fmtFloat(f.Float(), 32, verb)
|
|
case reflect.Float64:
|
|
p.fmtFloat(f.Float(), 64, verb)
|
|
case reflect.Complex64:
|
|
p.fmtComplex(f.Complex(), 64, verb)
|
|
case reflect.Complex128:
|
|
p.fmtComplex(f.Complex(), 128, verb)
|
|
case reflect.String:
|
|
p.fmtString(f.String(), verb)
|
|
case reflect.Map:
|
|
if p.fmt.sharpV {
|
|
p.WriteString(f.Type().String())
|
|
if f.IsNil() {
|
|
p.WriteString(nilParenString)
|
|
return
|
|
}
|
|
p.WriteByte('{')
|
|
} else {
|
|
p.WriteString(mapString)
|
|
}
|
|
keys := f.MapKeys()
|
|
for i, key := range keys {
|
|
if i > 0 {
|
|
if p.fmt.sharpV {
|
|
p.WriteString(commaSpaceString)
|
|
} else {
|
|
p.WriteByte(' ')
|
|
}
|
|
}
|
|
p.printValue(key, verb, depth+1)
|
|
p.WriteByte(':')
|
|
p.printValue(f.MapIndex(key), verb, depth+1)
|
|
}
|
|
if p.fmt.sharpV {
|
|
p.WriteByte('}')
|
|
} else {
|
|
p.WriteByte(']')
|
|
}
|
|
case reflect.Struct:
|
|
if p.fmt.sharpV {
|
|
p.WriteString(f.Type().String())
|
|
}
|
|
p.WriteByte('{')
|
|
for i := 0; i < f.NumField(); i++ {
|
|
if i > 0 {
|
|
if p.fmt.sharpV {
|
|
p.WriteString(commaSpaceString)
|
|
} else {
|
|
p.WriteByte(' ')
|
|
}
|
|
}
|
|
if p.fmt.plusV || p.fmt.sharpV {
|
|
if name := f.Type().Field(i).Name; name != "" {
|
|
p.WriteString(name)
|
|
p.WriteByte(':')
|
|
}
|
|
}
|
|
p.printValue(getField(f, i), verb, depth+1)
|
|
}
|
|
p.WriteByte('}')
|
|
case reflect.Interface:
|
|
value := f.Elem()
|
|
if !value.IsValid() {
|
|
if p.fmt.sharpV {
|
|
p.WriteString(f.Type().String())
|
|
p.WriteString(nilParenString)
|
|
} else {
|
|
p.WriteString(nilAngleString)
|
|
}
|
|
} else {
|
|
p.printValue(value, verb, depth+1)
|
|
}
|
|
case reflect.Array, reflect.Slice:
|
|
switch verb {
|
|
case 's', 'q', 'x', 'X':
|
|
// Handle byte and uint8 slices and arrays special for the above verbs.
|
|
t := f.Type()
|
|
if t.Elem().Kind() == reflect.Uint8 {
|
|
var bytes []byte
|
|
if f.Kind() == reflect.Slice {
|
|
bytes = f.Bytes()
|
|
} else if f.CanAddr() {
|
|
bytes = f.Slice(0, f.Len()).Bytes()
|
|
} else {
|
|
// We have an array, but we cannot Slice() a non-addressable array,
|
|
// 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, t.String())
|
|
return
|
|
}
|
|
}
|
|
if p.fmt.sharpV {
|
|
p.WriteString(f.Type().String())
|
|
if f.Kind() == reflect.Slice && f.IsNil() {
|
|
p.WriteString(nilParenString)
|
|
return
|
|
}
|
|
p.WriteByte('{')
|
|
for i := 0; i < f.Len(); i++ {
|
|
if i > 0 {
|
|
p.WriteString(commaSpaceString)
|
|
}
|
|
p.printValue(f.Index(i), verb, depth+1)
|
|
}
|
|
p.WriteByte('}')
|
|
} else {
|
|
p.WriteByte('[')
|
|
for i := 0; i < f.Len(); i++ {
|
|
if i > 0 {
|
|
p.WriteByte(' ')
|
|
}
|
|
p.printValue(f.Index(i), verb, depth+1)
|
|
}
|
|
p.WriteByte(']')
|
|
}
|
|
case reflect.Ptr:
|
|
// pointer to array or slice or struct? ok at top level
|
|
// but not embedded (avoid loops)
|
|
if depth == 0 && f.Pointer() != 0 {
|
|
switch a := f.Elem(); a.Kind() {
|
|
case reflect.Array, reflect.Slice, reflect.Struct, reflect.Map:
|
|
p.WriteByte('&')
|
|
p.printValue(a, verb, depth+1)
|
|
return
|
|
}
|
|
}
|
|
fallthrough
|
|
case reflect.Chan, reflect.Func, reflect.UnsafePointer:
|
|
p.fmtPointer(f, verb)
|
|
default:
|
|
p.unknownType(f)
|
|
}
|
|
}
|
|
|
|
// intFromArg gets the argNumth element of a. On return, isInt reports whether the argument has integer type.
|
|
func (p *printer) intFromArg() (num int, isInt bool) {
|
|
if p.argNum < len(p.args) {
|
|
arg := p.args[p.argNum]
|
|
num, isInt = arg.(int) // Almost always OK.
|
|
if !isInt {
|
|
// Work harder.
|
|
switch v := reflect.ValueOf(arg); v.Kind() {
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
n := v.Int()
|
|
if int64(int(n)) == n {
|
|
num = int(n)
|
|
isInt = true
|
|
}
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
n := v.Uint()
|
|
if int64(n) >= 0 && uint64(int(n)) == n {
|
|
num = int(n)
|
|
isInt = true
|
|
}
|
|
default:
|
|
// Already 0, false.
|
|
}
|
|
}
|
|
p.argNum++
|
|
if tooLarge(num) {
|
|
num = 0
|
|
isInt = false
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
// parseArgNumber returns the value of the bracketed number, minus 1
|
|
// (explicit argument numbers are one-indexed but we want zero-indexed).
|
|
// The opening bracket is known to be present at format[0].
|
|
// The returned values are the index, the number of bytes to consume
|
|
// up to the closing paren, if present, and whether the number parsed
|
|
// ok. The bytes to consume will be 1 if no closing paren is present.
|
|
func parseArgNumber(format string) (index int, wid int, ok bool) {
|
|
// There must be at least 3 bytes: [n].
|
|
if len(format) < 3 {
|
|
return 0, 1, false
|
|
}
|
|
|
|
// Find closing bracket.
|
|
for i := 1; i < len(format); i++ {
|
|
if format[i] == ']' {
|
|
width, ok, newi := parsenum(format, 1, i)
|
|
if !ok || newi != i {
|
|
return 0, i + 1, false
|
|
}
|
|
return width - 1, i + 1, true // arg numbers are one-indexed and skip paren.
|
|
}
|
|
}
|
|
return 0, 1, false
|
|
}
|
|
|
|
// updateArgNumber returns the next argument to evaluate, which is either the value of the passed-in
|
|
// argNum or the value of the bracketed integer that begins format[i:]. It also returns
|
|
// the new value of i, that is, the index of the next byte of the format to process.
|
|
func (p *printer) updateArgNumber(format string, i int) (newi int, found bool) {
|
|
if len(format) <= i || format[i] != '[' {
|
|
return i, false
|
|
}
|
|
p.reordered = true
|
|
index, wid, ok := parseArgNumber(format[i:])
|
|
if ok && 0 <= index && index < len(p.args) {
|
|
p.argNum = index
|
|
return i + wid, true
|
|
}
|
|
p.goodArgNum = false
|
|
return i + wid, ok
|
|
}
|
|
|
|
func (p *printer) badArgNum(verb rune) {
|
|
p.WriteString(percentBangString)
|
|
p.WriteRune(verb)
|
|
p.WriteString(badIndexString)
|
|
}
|
|
|
|
func (p *printer) missingArg(verb rune) {
|
|
p.WriteString(percentBangString)
|
|
p.WriteRune(verb)
|
|
p.WriteString(missingString)
|
|
}
|
|
|
|
func (p *printer) doPrintf(format string) {
|
|
end := len(format)
|
|
afterIndex := false // previous item in format was an index like [3].
|
|
formatLoop:
|
|
for i := 0; i < end; {
|
|
p.goodArgNum = true
|
|
lasti := i
|
|
for i < end && format[i] != '%' {
|
|
i++
|
|
}
|
|
if i > lasti {
|
|
p.WriteString(format[lasti:i])
|
|
}
|
|
if i >= end {
|
|
// done processing format string
|
|
break
|
|
}
|
|
|
|
// Process one verb
|
|
i++
|
|
|
|
// Do we have flags?
|
|
p.fmt.clearflags()
|
|
simpleFormat:
|
|
for ; i < end; i++ {
|
|
c := format[i]
|
|
switch c {
|
|
case '#':
|
|
p.fmt.sharp = true
|
|
case '0':
|
|
p.fmt.zero = !p.fmt.minus // Only allow zero padding to the left.
|
|
case '+':
|
|
p.fmt.plus = true
|
|
case '-':
|
|
p.fmt.minus = true
|
|
p.fmt.zero = false // Do not pad with zeros to the right.
|
|
case ' ':
|
|
p.fmt.space = true
|
|
default:
|
|
// Fast path for common case of ascii lower case simple verbs
|
|
// without precision or width or argument indices.
|
|
if 'a' <= c && c <= 'z' && p.argNum < len(p.args) {
|
|
if c == 'v' {
|
|
// Go syntax
|
|
p.fmt.sharpV = p.fmt.sharp
|
|
p.fmt.sharp = false
|
|
// Struct-field syntax
|
|
p.fmt.plusV = p.fmt.plus
|
|
p.fmt.plus = false
|
|
}
|
|
p.printArg(p.Arg(p.argNum+1), rune(c))
|
|
p.argNum++
|
|
i++
|
|
continue formatLoop
|
|
}
|
|
// Format is more complex than simple flags and a verb or is malformed.
|
|
break simpleFormat
|
|
}
|
|
}
|
|
|
|
// Do we have an explicit argument index?
|
|
i, afterIndex = p.updateArgNumber(format, i)
|
|
|
|
// Do we have width?
|
|
if i < end && format[i] == '*' {
|
|
i++
|
|
p.fmt.wid, p.fmt.widPresent = p.intFromArg()
|
|
|
|
if !p.fmt.widPresent {
|
|
p.WriteString(badWidthString)
|
|
}
|
|
|
|
// We have a negative width, so take its value and ensure
|
|
// that the minus flag is set
|
|
if p.fmt.wid < 0 {
|
|
p.fmt.wid = -p.fmt.wid
|
|
p.fmt.minus = true
|
|
p.fmt.zero = false // Do not pad with zeros to the right.
|
|
}
|
|
afterIndex = false
|
|
} else {
|
|
p.fmt.wid, p.fmt.widPresent, i = parsenum(format, i, end)
|
|
if afterIndex && p.fmt.widPresent { // "%[3]2d"
|
|
p.goodArgNum = false
|
|
}
|
|
}
|
|
|
|
// Do we have precision?
|
|
if i+1 < end && format[i] == '.' {
|
|
i++
|
|
if afterIndex { // "%[3].2d"
|
|
p.goodArgNum = false
|
|
}
|
|
i, afterIndex = p.updateArgNumber(format, i)
|
|
if i < end && format[i] == '*' {
|
|
i++
|
|
p.fmt.prec, p.fmt.precPresent = p.intFromArg()
|
|
// Negative precision arguments don't make sense
|
|
if p.fmt.prec < 0 {
|
|
p.fmt.prec = 0
|
|
p.fmt.precPresent = false
|
|
}
|
|
if !p.fmt.precPresent {
|
|
p.WriteString(badPrecString)
|
|
}
|
|
afterIndex = false
|
|
} else {
|
|
p.fmt.prec, p.fmt.precPresent, i = parsenum(format, i, end)
|
|
if !p.fmt.precPresent {
|
|
p.fmt.prec = 0
|
|
p.fmt.precPresent = true
|
|
}
|
|
}
|
|
}
|
|
|
|
if !afterIndex {
|
|
i, afterIndex = p.updateArgNumber(format, i)
|
|
}
|
|
|
|
if i >= end {
|
|
p.WriteString(noVerbString)
|
|
break
|
|
}
|
|
|
|
verb, w := utf8.DecodeRuneInString(format[i:])
|
|
i += w
|
|
|
|
switch {
|
|
case verb == '%': // Percent does not absorb operands and ignores f.wid and f.prec.
|
|
p.WriteByte('%')
|
|
case !p.goodArgNum:
|
|
p.badArgNum(verb)
|
|
case p.argNum >= len(p.args): // No argument left over to print for the current verb.
|
|
p.missingArg(verb)
|
|
case verb == 'v':
|
|
// Go syntax
|
|
p.fmt.sharpV = p.fmt.sharp
|
|
p.fmt.sharp = false
|
|
// Struct-field syntax
|
|
p.fmt.plusV = p.fmt.plus
|
|
p.fmt.plus = false
|
|
fallthrough
|
|
default:
|
|
p.printArg(p.args[p.argNum], verb)
|
|
p.argNum++
|
|
}
|
|
}
|
|
|
|
// Check for extra arguments, but only if there was at least one ordered
|
|
// argument. Note that this behavior is necessarily different from fmt:
|
|
// different variants of messages may opt to drop some or all of the
|
|
// arguments.
|
|
if !p.reordered && p.argNum < len(p.args) && p.argNum != 0 {
|
|
p.fmt.clearflags()
|
|
p.WriteString(extraString)
|
|
for i, arg := range p.args[p.argNum:] {
|
|
if i > 0 {
|
|
p.WriteString(commaSpaceString)
|
|
}
|
|
if arg == nil {
|
|
p.WriteString(nilAngleString)
|
|
} else {
|
|
p.WriteString(reflect.TypeOf(arg).String())
|
|
p.WriteByte('=')
|
|
p.printArg(arg, 'v')
|
|
}
|
|
}
|
|
p.WriteByte(')')
|
|
}
|
|
}
|
|
|
|
func (p *printer) doPrint(a []interface{}) {
|
|
prevString := false
|
|
for argNum, arg := range a {
|
|
isString := arg != nil && reflect.TypeOf(arg).Kind() == reflect.String
|
|
// Add a space between two non-string arguments.
|
|
if argNum > 0 && !isString && !prevString {
|
|
p.WriteByte(' ')
|
|
}
|
|
p.printArg(arg, 'v')
|
|
prevString = isString
|
|
}
|
|
}
|
|
|
|
// doPrintln is like doPrint but always adds a space between arguments
|
|
// and a newline after the last argument.
|
|
func (p *printer) doPrintln(a []interface{}) {
|
|
for argNum, arg := range a {
|
|
if argNum > 0 {
|
|
p.WriteByte(' ')
|
|
}
|
|
p.printArg(arg, 'v')
|
|
}
|
|
p.WriteByte('\n')
|
|
}
|