template_test.go

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // This benchmark tests text/template throughput,
     6  // converting a large data structure with a simple template.
     7  
     8  package go1
     9  
    10  import (
    11  	"bytes"
    12  	"io"
    13  	"strings"
    14  	"testing"
    15  	"text/template"
    16  )
    17  
    18  // After removing \t and \n this generates identical output to
    19  // json.Marshal, making it easy to test for correctness.
    20  const tmplText = `
    21  {
    22  	"tree":{{template "node" .Tree}},
    23  	"username":"{{.Username}}"
    24  }
    25  {{define "node"}}
    26  {
    27  	"name":"{{.Name}}",
    28  	"kids":[
    29  	{{range $i, $k := .Kids}}
    30  		{{if $i}}
    31  			,
    32  		{{end}}
    33  		{{template "node" $k}}
    34  	{{end}}
    35  	],
    36  	"cl_weight":{{.CLWeight}},
    37  	"touches":{{.Touches}},
    38  	"min_t":{{.MinT}},
    39  	"max_t":{{.MaxT}},
    40  	"mean_t":{{.MeanT}}
    41  }
    42  {{end}}
    43  `
    44  
    45  func stripTabNL(r rune) rune {
    46  	if r == '\t' || r == '\n' {
    47  		return -1
    48  	}
    49  	return r
    50  }
    51  
    52  var tmpl = template.Must(template.New("main").Parse(strings.Map(stripTabNL, tmplText)))
    53  
    54  func init() {
    55  	var buf bytes.Buffer
    56  	if err := tmpl.Execute(&buf, &jsondata); err != nil {
    57  		panic(err)
    58  	}
    59  	if !bytes.Equal(buf.Bytes(), jsonbytes) {
    60  		println(buf.Len(), len(jsonbytes))
    61  		panic("wrong output")
    62  	}
    63  }
    64  
    65  func tmplexec() {
    66  	if err := tmpl.Execute(io.Discard, &jsondata); err != nil {
    67  		panic(err)
    68  	}
    69  }
    70  
    71  func BenchmarkTemplate(b *testing.B) {
    72  	b.SetBytes(int64(len(jsonbytes)))
    73  	for i := 0; i < b.N; i++ {
    74  		tmplexec()
    75  	}
    76  }
    77
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