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builder.go
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builder.go
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package template
import (
"bytes"
"regexp"
"strconv"
"text/template"
"github.com/pkg/errors"
)
var (
templateNotDefinedRegexp = regexp.MustCompile(`template.*not defined$`)
)
type Builder struct {
Ctx []Ctx
Functs template.FuncMap
}
func (b *Builder) AddCtx(ctx Ctx) {
b.Ctx = append(b.Ctx, ctx)
}
func (b *Builder) String(text string) (string, error) {
if text == "" {
return "", nil
}
return b.RenderTemplate(text, text)
}
func (b *Builder) Bool(text string, defaultVal bool) (bool, error) {
if text == "" {
return defaultVal, nil
}
value, err := b.RenderTemplate(text, text)
if err != nil {
return defaultVal, errors.Wrap(err, "failed to render template")
}
// If the template didn't parse (turns into an empty string), then we should
// return the default
if value == "" {
return defaultVal, nil
}
result, err := strconv.ParseBool(value)
if err != nil {
// for now we are assuming default value if we fail to parse
return defaultVal, nil
}
return result, nil
}
func (b *Builder) Int(text string, defaultVal int64) (int64, error) {
if text == "" {
return defaultVal, nil
}
value, err := b.RenderTemplate(text, text)
if err != nil {
return defaultVal, errors.Wrap(err, "failed to render template")
}
// If the template didn't parse (turns into an empty string), then we should
// return the default
if value == "" {
return defaultVal, nil
}
result, err := strconv.ParseInt(value, 10, 64)
if err != nil {
// for now we are assuming default value if we fail to parse
return defaultVal, nil
}
return result, nil
}
func (b *Builder) Uint(text string, defaultVal uint64) (uint64, error) {
if text == "" {
return defaultVal, nil
}
value, err := b.RenderTemplate(text, text)
if err != nil {
return defaultVal, errors.Wrap(err, "failed to render template")
}
// If the template didn't parse (turns into an empty string), then we should
// return the default
if value == "" {
return defaultVal, nil
}
result, err := strconv.ParseUint(value, 10, 64)
if err != nil {
// for now we are assuming default value if we fail to parse
return defaultVal, nil
}
return result, nil
}
func (b *Builder) Float64(text string, defaultVal float64) (float64, error) {
if text == "" {
return defaultVal, nil
}
value, err := b.RenderTemplate(text, text)
if err != nil {
return defaultVal, errors.Wrap(err, "failed to render template")
}
// If the template didn't parse (turns into an empty string), then we should
// return the default
if value == "" {
return defaultVal, nil
}
result, err := strconv.ParseFloat(value, 64)
if err != nil {
// for now we are assuming default value if we fail to parse
return defaultVal, nil
}
return result, nil
}
func (b *Builder) BuildFuncMap() template.FuncMap {
if b.Functs == nil {
b.Functs = template.FuncMap{}
}
funcMap := b.Functs
for _, ctx := range b.Ctx {
for name, fn := range ctx.FuncMap() {
funcMap[name] = fn
}
}
return funcMap
}
func (b *Builder) GetTemplate(name, text string) (*template.Template, error) {
tmpl, err := template.New(name).Delims("{{repl ", "}}").Funcs(b.BuildFuncMap()).Parse(text)
if err != nil {
return nil, err
}
return tmpl, nil
}
func (b *Builder) RenderTemplate(name string, text string) (string, error) {
tmpl, err := b.GetTemplate(name, text)
if err != nil {
return "", errors.Wrap(err, "failed to get template")
}
var contents bytes.Buffer
if err := tmpl.Execute(&contents, nil); err != nil {
return "", errors.Wrap(err, "failed to execute template")
}
return contents.String(), nil
}