github.com/patricebensoussan/go/codec@v1.2.99/gen-dec-array.go.tmpl (about)

     1  {{var "v"}} := {{if not isArray}}*{{end}}{{ .Varname }}
     2  {{var "h"}}, {{var "l"}} := z.DecSliceHelperStart() {{/* // helper, containerLenS */}}
     3  {{if not isArray -}}
     4  var {{var "c"}} bool {{/* // changed */}}
     5  _ = {{var "c"}}
     6  if {{var "h"}}.IsNil {
     7  	if {{var "v"}} != nil {
     8  		{{var "v"}} = nil
     9  		{{var "c"}} = true
    10  	}
    11  } else {{end -}}
    12  if {{var "l"}} == 0 {
    13  	{{if isSlice -}}
    14  	if {{var "v"}} == nil {
    15  		{{var "v"}} = []{{ .Typ }}{}
    16  		{{var "c"}} = true
    17  	} else if len({{var "v"}}) != 0 {
    18  		{{var "v"}} = {{var "v"}}[:0]
    19  		{{var "c"}} = true
    20  	} {{else if isChan }}if {{var "v"}} == nil {
    21  		{{var "v"}} = make({{ .CTyp }}, 0)
    22  		{{var "c"}} = true
    23  	}
    24      {{end -}}
    25  } else {
    26  	{{var "hl"}} := {{var "l"}} > 0
    27  	var {{var "rl"}} int
    28  	_ =  {{var "rl"}}
    29  	{{if isSlice }} if {{var "hl"}} {
    30  	if {{var "l"}} > cap({{var "v"}}) {
    31  		{{var "rl"}} = z.DecInferLen({{var "l"}}, z.DecBasicHandle().MaxInitLen, {{ .Size }})
    32  		if {{var "rl"}} <= cap({{var "v"}}) {
    33  			{{var "v"}} = {{var "v"}}[:{{var "rl"}}]
    34  		} else {
    35  			{{var "v"}} = make([]{{ .Typ }}, {{var "rl"}})
    36  		}
    37  		{{var "c"}} = true
    38  	} else if {{var "l"}} != len({{var "v"}}) {
    39  		{{var "v"}} = {{var "v"}}[:{{var "l"}}]
    40  		{{var "c"}} = true
    41  	}
    42  	}
    43      {{end -}}
    44  	var {{var "j"}} int 
    45      {{/* // var {{var "dn"}} bool */ -}}
    46  	for {{var "j"}} = 0; ({{var "hl"}} && {{var "j"}} < {{var "l"}}) || !({{var "hl"}} || z.DecCheckBreak()); {{var "j"}}++ { // bounds-check-elimination
    47  		{{if not isArray}} if {{var "j"}} == 0 && {{var "v"}} == nil {
    48  			if {{var "hl"}} {
    49  				{{var "rl"}} = z.DecInferLen({{var "l"}}, z.DecBasicHandle().MaxInitLen, {{ .Size }})
    50  			} else {
    51  				{{var "rl"}} = {{if isSlice}}8{{else if isChan}}64{{end}}
    52  			}
    53  			{{var "v"}} = make({{if isSlice}}[]{{ .Typ }}{{else if isChan}}{{.CTyp}}{{end}}, {{var "rl"}})
    54  			{{var "c"}} = true 
    55  		}
    56          {{end -}}
    57  		{{var "h"}}.ElemContainerState({{var "j"}})
    58          {{/* {{var "dn"}} = r.TryDecodeAsNil() */}}{{/* commented out, as decLineVar handles this already each time */ -}}
    59          {{if isChan}}{{ $x := printf "%[1]vvcx%[2]v" .TempVar .Rand }}var {{$x}} {{ .Typ }}
    60  		{{ decLineVar $x -}}
    61  		{{var "v"}} <- {{ $x }}
    62          {{else}}{{/* // if indefinite, etc, then expand the slice if necessary */ -}}
    63  		var {{var "db"}} bool
    64  		if {{var "j"}} >= len({{var "v"}}) {
    65  			{{if isSlice }} {{var "v"}} = append({{var "v"}}, {{ zero }})
    66  			{{var "c"}} = true
    67  			{{else}} z.DecArrayCannotExpand(len(v), {{var "j"}}+1); {{var "db"}} = true
    68  			{{end -}}
    69  		}
    70  		if {{var "db"}} {
    71  			z.DecSwallow()
    72  		} else {
    73  			{{ $x := printf "%[1]vv%[2]v[%[1]vj%[2]v]" .TempVar .Rand }}{{ decLineVar $x -}}
    74  		}
    75          {{end -}}
    76  	}
    77  	{{if isSlice}} if {{var "j"}} < len({{var "v"}}) {
    78  		{{var "v"}} = {{var "v"}}[:{{var "j"}}]
    79  		{{var "c"}} = true
    80  	} else if {{var "j"}} == 0 && {{var "v"}} == nil {
    81  		{{var "v"}} = make([]{{ .Typ }}, 0)
    82  		{{var "c"}} = true
    83  	}
    84      {{end -}}
    85  }
    86  {{var "h"}}.End()
    87  {{if not isArray }}if {{var "c"}} { 
    88  	*{{ .Varname }} = {{var "v"}}
    89  }
    90  {{end -}}