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package internal
import (
"bytes"
"strings"
"sync"
gotemplate "text/template"
)
// Template stores the template for a string.
type Template struct {
Src string
LeftDelim string
RightDelim string
parseOnce sync.Once
parsedTemplate *gotemplate.Template
parseError error
}
func (t *Template) Execute(funcs gotemplate.FuncMap, data interface{}) (string, error) {
leftDelim := t.LeftDelim
if leftDelim == "" {
leftDelim = "{{"
}
if !strings.Contains(t.Src, leftDelim) {
// Fast path to avoid parsing a template that has no actions.
return t.Src, nil
}
var gt *gotemplate.Template
var err error
if funcs == nil {
t.parseOnce.Do(func() {
// If funcs is nil, then we only need to parse this template once.
t.parsedTemplate, t.parseError = gotemplate.New("").Delims(t.LeftDelim, t.RightDelim).Parse(t.Src)
})
gt, err = t.parsedTemplate, t.parseError
} else {
gt, err = gotemplate.New("").Delims(t.LeftDelim, t.RightDelim).Funcs(funcs).Parse(t.Src)
}
if err != nil {
return "", err
}
var buf bytes.Buffer
if err := gt.Execute(&buf, data); err != nil {
return "", err
}
return buf.String(), nil
}
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