forked from gitea/gitea
541 lines
16 KiB
Cheetah
541 lines
16 KiB
Cheetah
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// +build !notfastpath
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// Copyright (c) 2012-2015 Ugorji Nwoke. All rights reserved.
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// Use of this source code is governed by a MIT license found in the LICENSE file.
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// ************************************************************
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// DO NOT EDIT.
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// THIS FILE IS AUTO-GENERATED from fast-path.go.tmpl
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// ************************************************************
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package codec
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// Fast path functions try to create a fast path encode or decode implementation
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// for common maps and slices.
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//
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// We define the functions and register then in this single file
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// so as not to pollute the encode.go and decode.go, and create a dependency in there.
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// This file can be omitted without causing a build failure.
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//
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// The advantage of fast paths is:
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// - Many calls bypass reflection altogether
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//
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// Currently support
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// - slice of all builtin types,
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// - map of all builtin types to string or interface value
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// - symetrical maps of all builtin types (e.g. str-str, uint8-uint8)
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// This should provide adequate "typical" implementations.
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//
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// Note that fast track decode functions must handle values for which an address cannot be obtained.
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// For example:
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// m2 := map[string]int{}
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// p2 := []interface{}{m2}
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// // decoding into p2 will bomb if fast track functions do not treat like unaddressable.
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//
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import (
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"reflect"
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"sort"
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)
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const fastpathCheckNilFalse = false // for reflect
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const fastpathCheckNilTrue = true // for type switch
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type fastpathT struct {}
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var fastpathTV fastpathT
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type fastpathE struct {
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rtid uintptr
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rt reflect.Type
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encfn func(*encFnInfo, reflect.Value)
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decfn func(*decFnInfo, reflect.Value)
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}
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type fastpathA [{{ .FastpathLen }}]fastpathE
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func (x *fastpathA) index(rtid uintptr) int {
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// use binary search to grab the index (adapted from sort/search.go)
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h, i, j := 0, 0, {{ .FastpathLen }} // len(x)
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for i < j {
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h = i + (j-i)/2
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if x[h].rtid < rtid {
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i = h + 1
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} else {
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j = h
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}
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}
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if i < {{ .FastpathLen }} && x[i].rtid == rtid {
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return i
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}
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return -1
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}
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type fastpathAslice []fastpathE
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func (x fastpathAslice) Len() int { return len(x) }
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func (x fastpathAslice) Less(i, j int) bool { return x[i].rtid < x[j].rtid }
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func (x fastpathAslice) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
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var fastpathAV fastpathA
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// due to possible initialization loop error, make fastpath in an init()
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func init() {
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if !fastpathEnabled {
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return
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}
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i := 0
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fn := func(v interface{}, fe func(*encFnInfo, reflect.Value), fd func(*decFnInfo, reflect.Value)) (f fastpathE) {
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xrt := reflect.TypeOf(v)
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xptr := reflect.ValueOf(xrt).Pointer()
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fastpathAV[i] = fastpathE{xptr, xrt, fe, fd}
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i++
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return
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}
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
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fn([]{{ .Elem }}(nil), (*encFnInfo).{{ .MethodNamePfx "fastpathEnc" false }}R, (*decFnInfo).{{ .MethodNamePfx "fastpathDec" false }}R){{end}}{{end}}{{end}}
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{{range .Values}}{{if not .Primitive}}{{if .MapKey }}
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fn(map[{{ .MapKey }}]{{ .Elem }}(nil), (*encFnInfo).{{ .MethodNamePfx "fastpathEnc" false }}R, (*decFnInfo).{{ .MethodNamePfx "fastpathDec" false }}R){{end}}{{end}}{{end}}
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sort.Sort(fastpathAslice(fastpathAV[:]))
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}
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// -- encode
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// -- -- fast path type switch
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func fastpathEncodeTypeSwitch(iv interface{}, e *Encoder) bool {
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if !fastpathEnabled {
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return false
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}
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switch v := iv.(type) {
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
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case []{{ .Elem }}:{{else}}
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case map[{{ .MapKey }}]{{ .Elem }}:{{end}}
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(v, fastpathCheckNilTrue, e){{if not .MapKey }}
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case *[]{{ .Elem }}:{{else}}
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case *map[{{ .MapKey }}]{{ .Elem }}:{{end}}
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(*v, fastpathCheckNilTrue, e)
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{{end}}{{end}}
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default:
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_ = v // TODO: workaround https://github.com/golang/go/issues/12927 (remove after go 1.6 release)
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return false
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}
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return true
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}
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func fastpathEncodeTypeSwitchSlice(iv interface{}, e *Encoder) bool {
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if !fastpathEnabled {
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return false
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}
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switch v := iv.(type) {
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
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case []{{ .Elem }}:
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(v, fastpathCheckNilTrue, e)
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case *[]{{ .Elem }}:
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(*v, fastpathCheckNilTrue, e)
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{{end}}{{end}}{{end}}
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default:
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_ = v // TODO: workaround https://github.com/golang/go/issues/12927 (remove after go 1.6 release)
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return false
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}
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return true
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}
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func fastpathEncodeTypeSwitchMap(iv interface{}, e *Encoder) bool {
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if !fastpathEnabled {
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return false
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}
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switch v := iv.(type) {
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{{range .Values}}{{if not .Primitive}}{{if .MapKey }}
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case map[{{ .MapKey }}]{{ .Elem }}:
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(v, fastpathCheckNilTrue, e)
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case *map[{{ .MapKey }}]{{ .Elem }}:
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(*v, fastpathCheckNilTrue, e)
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{{end}}{{end}}{{end}}
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default:
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_ = v // TODO: workaround https://github.com/golang/go/issues/12927 (remove after go 1.6 release)
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return false
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}
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return true
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}
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// -- -- fast path functions
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
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func (f *encFnInfo) {{ .MethodNamePfx "fastpathEnc" false }}R(rv reflect.Value) {
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if f.ti.mbs {
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fastpathTV.{{ .MethodNamePfx "EncAsMap" false }}V(rv.Interface().([]{{ .Elem }}), fastpathCheckNilFalse, f.e)
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} else {
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(rv.Interface().([]{{ .Elem }}), fastpathCheckNilFalse, f.e)
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}
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}
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func (_ fastpathT) {{ .MethodNamePfx "Enc" false }}V(v []{{ .Elem }}, checkNil bool, e *Encoder) {
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ee := e.e
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cr := e.cr
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if checkNil && v == nil {
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ee.EncodeNil()
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return
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}
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ee.EncodeArrayStart(len(v))
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for _, v2 := range v {
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if cr != nil { cr.sendContainerState(containerArrayElem) }
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{{ encmd .Elem "v2"}}
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}
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if cr != nil { cr.sendContainerState(containerArrayEnd) }{{/* ee.EncodeEnd() */}}
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}
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func (_ fastpathT) {{ .MethodNamePfx "EncAsMap" false }}V(v []{{ .Elem }}, checkNil bool, e *Encoder) {
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ee := e.e
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cr := e.cr
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if checkNil && v == nil {
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ee.EncodeNil()
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return
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}
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if len(v)%2 == 1 {
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e.errorf("mapBySlice requires even slice length, but got %v", len(v))
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return
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}
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ee.EncodeMapStart(len(v) / 2)
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for j, v2 := range v {
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if cr != nil {
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if j%2 == 0 {
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cr.sendContainerState(containerMapKey)
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} else {
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cr.sendContainerState(containerMapValue)
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}
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}
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{{ encmd .Elem "v2"}}
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}
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if cr != nil { cr.sendContainerState(containerMapEnd) }
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}
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{{end}}{{end}}{{end}}
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{{range .Values}}{{if not .Primitive}}{{if .MapKey }}
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func (f *encFnInfo) {{ .MethodNamePfx "fastpathEnc" false }}R(rv reflect.Value) {
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fastpathTV.{{ .MethodNamePfx "Enc" false }}V(rv.Interface().(map[{{ .MapKey }}]{{ .Elem }}), fastpathCheckNilFalse, f.e)
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}
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func (_ fastpathT) {{ .MethodNamePfx "Enc" false }}V(v map[{{ .MapKey }}]{{ .Elem }}, checkNil bool, e *Encoder) {
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ee := e.e
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cr := e.cr
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if checkNil && v == nil {
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ee.EncodeNil()
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return
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}
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ee.EncodeMapStart(len(v))
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{{if eq .MapKey "string"}}asSymbols := e.h.AsSymbols&AsSymbolMapStringKeysFlag != 0
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{{end}}if e.h.Canonical {
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{{if eq .MapKey "interface{}"}}{{/* out of band
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*/}}var mksv []byte = make([]byte, 0, len(v)*16) // temporary byte slice for the encoding
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e2 := NewEncoderBytes(&mksv, e.hh)
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v2 := make([]bytesI, len(v))
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var i, l int
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var vp *bytesI {{/* put loop variables outside. seems currently needed for better perf */}}
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for k2, _ := range v {
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l = len(mksv)
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e2.MustEncode(k2)
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vp = &v2[i]
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vp.v = mksv[l:]
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vp.i = k2
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i++
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}
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sort.Sort(bytesISlice(v2))
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for j := range v2 {
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if cr != nil { cr.sendContainerState(containerMapKey) }
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e.asis(v2[j].v)
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if cr != nil { cr.sendContainerState(containerMapValue) }
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e.encode(v[v2[j].i])
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} {{else}}{{ $x := sorttype .MapKey true}}v2 := make([]{{ $x }}, len(v))
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var i int
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for k, _ := range v {
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v2[i] = {{ $x }}(k)
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i++
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}
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sort.Sort({{ sorttype .MapKey false}}(v2))
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for _, k2 := range v2 {
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if cr != nil { cr.sendContainerState(containerMapKey) }
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{{if eq .MapKey "string"}}if asSymbols {
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ee.EncodeSymbol(k2)
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} else {
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ee.EncodeString(c_UTF8, k2)
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}{{else}}{{ $y := printf "%s(k2)" .MapKey }}{{ encmd .MapKey $y }}{{end}}
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if cr != nil { cr.sendContainerState(containerMapValue) }
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{{ $y := printf "v[%s(k2)]" .MapKey }}{{ encmd .Elem $y }}
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} {{end}}
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} else {
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for k2, v2 := range v {
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if cr != nil { cr.sendContainerState(containerMapKey) }
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{{if eq .MapKey "string"}}if asSymbols {
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ee.EncodeSymbol(k2)
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} else {
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ee.EncodeString(c_UTF8, k2)
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}{{else}}{{ encmd .MapKey "k2"}}{{end}}
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if cr != nil { cr.sendContainerState(containerMapValue) }
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{{ encmd .Elem "v2"}}
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}
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}
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if cr != nil { cr.sendContainerState(containerMapEnd) }{{/* ee.EncodeEnd() */}}
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}
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{{end}}{{end}}{{end}}
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// -- decode
|
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|
|
|
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|
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// -- -- fast path type switch
|
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|
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func fastpathDecodeTypeSwitch(iv interface{}, d *Decoder) bool {
|
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|
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if !fastpathEnabled {
|
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return false
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}
|
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switch v := iv.(type) {
|
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{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
|
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case []{{ .Elem }}:{{else}}
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case map[{{ .MapKey }}]{{ .Elem }}:{{end}}
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fastpathTV.{{ .MethodNamePfx "Dec" false }}V(v, fastpathCheckNilFalse, false, d){{if not .MapKey }}
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case *[]{{ .Elem }}:{{else}}
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case *map[{{ .MapKey }}]{{ .Elem }}:{{end}}
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v2, changed2 := fastpathTV.{{ .MethodNamePfx "Dec" false }}V(*v, fastpathCheckNilFalse, true, d)
|
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|
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if changed2 {
|
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*v = v2
|
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}
|
||
|
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{{end}}{{end}}
|
||
|
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default:
|
||
|
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_ = v // TODO: workaround https://github.com/golang/go/issues/12927 (remove after go 1.6 release)
|
||
|
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return false
|
||
|
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}
|
||
|
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return true
|
||
|
|
}
|
||
|
|
|
||
|
|
// -- -- fast path functions
|
||
|
|
{{range .Values}}{{if not .Primitive}}{{if not .MapKey }}
|
||
|
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{{/*
|
||
|
|
Slices can change if they
|
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|
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- did not come from an array
|
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|
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- are addressable (from a ptr)
|
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|
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- are settable (e.g. contained in an interface{})
|
||
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*/}}
|
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|
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func (f *decFnInfo) {{ .MethodNamePfx "fastpathDec" false }}R(rv reflect.Value) {
|
||
|
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array := f.seq == seqTypeArray
|
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|
|
if !array && rv.CanAddr() { {{/* // CanSet => CanAddr + Exported */}}
|
||
|
|
vp := rv.Addr().Interface().(*[]{{ .Elem }})
|
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|
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v, changed := fastpathTV.{{ .MethodNamePfx "Dec" false }}V(*vp, fastpathCheckNilFalse, !array, f.d)
|
||
|
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if changed {
|
||
|
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*vp = v
|
||
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}
|
||
|
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} else {
|
||
|
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v := rv.Interface().([]{{ .Elem }})
|
||
|
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fastpathTV.{{ .MethodNamePfx "Dec" false }}V(v, fastpathCheckNilFalse, false, f.d)
|
||
|
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}
|
||
|
|
}
|
||
|
|
|
||
|
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func (f fastpathT) {{ .MethodNamePfx "Dec" false }}X(vp *[]{{ .Elem }}, checkNil bool, d *Decoder) {
|
||
|
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v, changed := f.{{ .MethodNamePfx "Dec" false }}V(*vp, checkNil, true, d)
|
||
|
|
if changed {
|
||
|
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*vp = v
|
||
|
|
}
|
||
|
|
}
|
||
|
|
func (_ fastpathT) {{ .MethodNamePfx "Dec" false }}V(v []{{ .Elem }}, checkNil bool, canChange bool, d *Decoder) (_ []{{ .Elem }}, changed bool) {
|
||
|
|
dd := d.d
|
||
|
|
{{/* // if dd.isContainerType(valueTypeNil) { dd.TryDecodeAsNil() */}}
|
||
|
|
if checkNil && dd.TryDecodeAsNil() {
|
||
|
|
if v != nil {
|
||
|
|
changed = true
|
||
|
|
}
|
||
|
|
return nil, changed
|
||
|
|
}
|
||
|
|
|
||
|
|
slh, containerLenS := d.decSliceHelperStart()
|
||
|
|
if containerLenS == 0 {
|
||
|
|
if canChange {
|
||
|
|
if v == nil {
|
||
|
|
v = []{{ .Elem }}{}
|
||
|
|
} else if len(v) != 0 {
|
||
|
|
v = v[:0]
|
||
|
|
}
|
||
|
|
changed = true
|
||
|
|
}
|
||
|
|
slh.End()
|
||
|
|
return v, changed
|
||
|
|
}
|
||
|
|
|
||
|
|
if containerLenS > 0 {
|
||
|
|
x2read := containerLenS
|
||
|
|
var xtrunc bool
|
||
|
|
if containerLenS > cap(v) {
|
||
|
|
if canChange { {{/*
|
||
|
|
// fast-path is for "basic" immutable types, so no need to copy them over
|
||
|
|
// s := make([]{{ .Elem }}, decInferLen(containerLenS, d.h.MaxInitLen))
|
||
|
|
// copy(s, v[:cap(v)])
|
||
|
|
// v = s */}}
|
||
|
|
var xlen int
|
||
|
|
xlen, xtrunc = decInferLen(containerLenS, d.h.MaxInitLen, {{ .Size }})
|
||
|
|
if xtrunc {
|
||
|
|
if xlen <= cap(v) {
|
||
|
|
v = v[:xlen]
|
||
|
|
} else {
|
||
|
|
v = make([]{{ .Elem }}, xlen)
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
v = make([]{{ .Elem }}, xlen)
|
||
|
|
}
|
||
|
|
changed = true
|
||
|
|
} else {
|
||
|
|
d.arrayCannotExpand(len(v), containerLenS)
|
||
|
|
}
|
||
|
|
x2read = len(v)
|
||
|
|
} else if containerLenS != len(v) {
|
||
|
|
if canChange {
|
||
|
|
v = v[:containerLenS]
|
||
|
|
changed = true
|
||
|
|
}
|
||
|
|
} {{/* // all checks done. cannot go past len. */}}
|
||
|
|
j := 0
|
||
|
|
for ; j < x2read; j++ {
|
||
|
|
slh.ElemContainerState(j)
|
||
|
|
{{ if eq .Elem "interface{}" }}d.decode(&v[j]){{ else }}v[j] = {{ decmd .Elem }}{{ end }}
|
||
|
|
}
|
||
|
|
if xtrunc { {{/* // means canChange=true, changed=true already. */}}
|
||
|
|
for ; j < containerLenS; j++ {
|
||
|
|
v = append(v, {{ zerocmd .Elem }})
|
||
|
|
slh.ElemContainerState(j)
|
||
|
|
{{ if eq .Elem "interface{}" }}d.decode(&v[j]){{ else }}v[j] = {{ decmd .Elem }}{{ end }}
|
||
|
|
}
|
||
|
|
} else if !canChange {
|
||
|
|
for ; j < containerLenS; j++ {
|
||
|
|
slh.ElemContainerState(j)
|
||
|
|
d.swallow()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
breakFound := dd.CheckBreak() {{/* check break first, so we can initialize v with a capacity of 4 if necessary */}}
|
||
|
|
if breakFound {
|
||
|
|
if canChange {
|
||
|
|
if v == nil {
|
||
|
|
v = []{{ .Elem }}{}
|
||
|
|
} else if len(v) != 0 {
|
||
|
|
v = v[:0]
|
||
|
|
}
|
||
|
|
changed = true
|
||
|
|
}
|
||
|
|
slh.End()
|
||
|
|
return v, changed
|
||
|
|
}
|
||
|
|
if cap(v) == 0 {
|
||
|
|
v = make([]{{ .Elem }}, 1, 4)
|
||
|
|
changed = true
|
||
|
|
}
|
||
|
|
j := 0
|
||
|
|
for ; !breakFound; j++ {
|
||
|
|
if j >= len(v) {
|
||
|
|
if canChange {
|
||
|
|
v = append(v, {{ zerocmd .Elem }})
|
||
|
|
changed = true
|
||
|
|
} else {
|
||
|
|
d.arrayCannotExpand(len(v), j+1)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
slh.ElemContainerState(j)
|
||
|
|
if j < len(v) { {{/* // all checks done. cannot go past len. */}}
|
||
|
|
{{ if eq .Elem "interface{}" }}d.decode(&v[j])
|
||
|
|
{{ else }}v[j] = {{ decmd .Elem }}{{ end }}
|
||
|
|
} else {
|
||
|
|
d.swallow()
|
||
|
|
}
|
||
|
|
breakFound = dd.CheckBreak()
|
||
|
|
}
|
||
|
|
if canChange && j < len(v) {
|
||
|
|
v = v[:j]
|
||
|
|
changed = true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
slh.End()
|
||
|
|
return v, changed
|
||
|
|
}
|
||
|
|
|
||
|
|
{{end}}{{end}}{{end}}
|
||
|
|
|
||
|
|
|
||
|
|
{{range .Values}}{{if not .Primitive}}{{if .MapKey }}
|
||
|
|
{{/*
|
||
|
|
Maps can change if they are
|
||
|
|
- addressable (from a ptr)
|
||
|
|
- settable (e.g. contained in an interface{})
|
||
|
|
*/}}
|
||
|
|
func (f *decFnInfo) {{ .MethodNamePfx "fastpathDec" false }}R(rv reflect.Value) {
|
||
|
|
if rv.CanAddr() {
|
||
|
|
vp := rv.Addr().Interface().(*map[{{ .MapKey }}]{{ .Elem }})
|
||
|
|
v, changed := fastpathTV.{{ .MethodNamePfx "Dec" false }}V(*vp, fastpathCheckNilFalse, true, f.d)
|
||
|
|
if changed {
|
||
|
|
*vp = v
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
v := rv.Interface().(map[{{ .MapKey }}]{{ .Elem }})
|
||
|
|
fastpathTV.{{ .MethodNamePfx "Dec" false }}V(v, fastpathCheckNilFalse, false, f.d)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
func (f fastpathT) {{ .MethodNamePfx "Dec" false }}X(vp *map[{{ .MapKey }}]{{ .Elem }}, checkNil bool, d *Decoder) {
|
||
|
|
v, changed := f.{{ .MethodNamePfx "Dec" false }}V(*vp, checkNil, true, d)
|
||
|
|
if changed {
|
||
|
|
*vp = v
|
||
|
|
}
|
||
|
|
}
|
||
|
|
func (_ fastpathT) {{ .MethodNamePfx "Dec" false }}V(v map[{{ .MapKey }}]{{ .Elem }}, checkNil bool, canChange bool,
|
||
|
|
d *Decoder) (_ map[{{ .MapKey }}]{{ .Elem }}, changed bool) {
|
||
|
|
dd := d.d
|
||
|
|
cr := d.cr
|
||
|
|
{{/* // if dd.isContainerType(valueTypeNil) {dd.TryDecodeAsNil() */}}
|
||
|
|
if checkNil && dd.TryDecodeAsNil() {
|
||
|
|
if v != nil {
|
||
|
|
changed = true
|
||
|
|
}
|
||
|
|
return nil, changed
|
||
|
|
}
|
||
|
|
|
||
|
|
containerLen := dd.ReadMapStart()
|
||
|
|
if canChange && v == nil {
|
||
|
|
xlen, _ := decInferLen(containerLen, d.h.MaxInitLen, {{ .Size }})
|
||
|
|
v = make(map[{{ .MapKey }}]{{ .Elem }}, xlen)
|
||
|
|
changed = true
|
||
|
|
}
|
||
|
|
{{ if eq .Elem "interface{}" }}mapGet := !d.h.MapValueReset && !d.h.InterfaceReset{{end}}
|
||
|
|
var mk {{ .MapKey }}
|
||
|
|
var mv {{ .Elem }}
|
||
|
|
if containerLen > 0 {
|
||
|
|
for j := 0; j < containerLen; j++ {
|
||
|
|
if cr != nil { cr.sendContainerState(containerMapKey) }
|
||
|
|
{{ if eq .MapKey "interface{}" }}mk = nil
|
||
|
|
d.decode(&mk)
|
||
|
|
if bv, bok := mk.([]byte); bok {
|
||
|
|
mk = d.string(bv) {{/* // maps cannot have []byte as key. switch to string. */}}
|
||
|
|
}{{ else }}mk = {{ decmd .MapKey }}{{ end }}
|
||
|
|
if cr != nil { cr.sendContainerState(containerMapValue) }
|
||
|
|
{{ if eq .Elem "interface{}" }}if mapGet { mv = v[mk] } else { mv = nil }
|
||
|
|
d.decode(&mv){{ else }}mv = {{ decmd .Elem }}{{ end }}
|
||
|
|
if v != nil {
|
||
|
|
v[mk] = mv
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else if containerLen < 0 {
|
||
|
|
for j := 0; !dd.CheckBreak(); j++ {
|
||
|
|
if cr != nil { cr.sendContainerState(containerMapKey) }
|
||
|
|
{{ if eq .MapKey "interface{}" }}mk = nil
|
||
|
|
d.decode(&mk)
|
||
|
|
if bv, bok := mk.([]byte); bok {
|
||
|
|
mk = d.string(bv) {{/* // maps cannot have []byte as key. switch to string. */}}
|
||
|
|
}{{ else }}mk = {{ decmd .MapKey }}{{ end }}
|
||
|
|
if cr != nil { cr.sendContainerState(containerMapValue) }
|
||
|
|
{{ if eq .Elem "interface{}" }}if mapGet { mv = v[mk] } else { mv = nil }
|
||
|
|
d.decode(&mv){{ else }}mv = {{ decmd .Elem }}{{ end }}
|
||
|
|
if v != nil {
|
||
|
|
v[mk] = mv
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if cr != nil { cr.sendContainerState(containerMapEnd) }
|
||
|
|
return v, changed
|
||
|
|
}
|
||
|
|
|
||
|
|
{{end}}{{end}}{{end}}
|