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template.go
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template.go
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// Copyright 2021 Optakt Labs OÜ
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
package generator
import (
"fmt"
"os"
"path/filepath"
"text/template"
)
const dictionaryTemplate = `// Copyright 2021 Optakt Labs OÜ
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
package zbor
// {{ .Name }}Dictionary is a byte slice that contains the result of running the Zstandard training mode
// on the {{ .Name }} of the DPS index. This allows zstandard to achieve a better compression ratio, specifically for
// small data.
// See http://facebook.github.io/zstd/#small-data
// See https://github.com/facebook/zstd/blob/master/doc/zstd_compression_format.md#dictionary-format
var {{ .Name }}Dictionary = []byte{
{{ range .Bytes }}{{ . }}, {{ end }}
}
`
type templateData struct {
Name string
Bytes []byte
}
// compile takes a raw dictionary and uses a template to compile it into a Go file.
func (g *Generator) compile(dict *dictionary) error {
// Create dictionary file.
filename := dict.kind.String() + ".go"
path := filepath.Join(g.cfg.DictionaryPath, filename)
file, err := os.Create(path)
if err != nil {
return fmt.Errorf("could not open dictionary file: %w", err)
}
defer file.Close()
// Execute template using the dictionary file as the writer.
t := template.Must(template.New("").Parse(dictionaryTemplate))
err = t.Execute(file, templateData{Name: dict.kind.String(), Bytes: dict.raw})
if err != nil {
return fmt.Errorf("could not execute dictionary template: %w", err)
}
return nil
}