mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-25 14:41:00 +00:00
d382502d6d
Usage:
```html
{{ "title = \"Hello World\"" | transform.Remarshal "json" | safeHTML }}
```
Fixes #4389
98 lines
2.2 KiB
Go
98 lines
2.2 KiB
Go
package transform
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import (
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"bytes"
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"errors"
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"strings"
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"github.com/gohugoio/hugo/parser"
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"github.com/spf13/cast"
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)
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// Remarshal is used in the Hugo documentation to convert configuration
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// examples from YAML to JSON, TOML (and possibly the other way around).
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// The is primarily a helper for the Hugo docs site.
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// It is not a general purpose YAML to TOML converter etc., and may
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// change without notice if it serves a purpose in the docs.
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// Format is one of json, yaml or toml.
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func (ns *Namespace) Remarshal(format string, data interface{}) (string, error) {
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from, err := cast.ToStringE(data)
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if err != nil {
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return "", err
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}
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from = strings.TrimSpace(from)
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format = strings.TrimSpace(strings.ToLower(format))
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if from == "" {
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return "", nil
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}
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mark, err := toFormatMark(format)
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if err != nil {
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return "", err
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}
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fromFormat, err := detectFormat(from)
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if err != nil {
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return "", err
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}
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var metaHandler func(d []byte) (map[string]interface{}, error)
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switch fromFormat {
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case "yaml":
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metaHandler = parser.HandleYAMLMetaData
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case "toml":
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metaHandler = parser.HandleTOMLMetaData
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case "json":
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metaHandler = parser.HandleJSONMetaData
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}
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meta, err := metaHandler([]byte(from))
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if err != nil {
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return "", err
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}
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var result bytes.Buffer
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if err := parser.InterfaceToConfig(meta, mark, &result); err != nil {
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return "", err
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}
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return result.String(), nil
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}
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func toFormatMark(format string) (rune, error) {
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// TODO(bep) the parser package needs a cleaning.
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switch format {
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case "yaml":
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return rune(parser.YAMLLead[0]), nil
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case "toml":
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return rune(parser.TOMLLead[0]), nil
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case "json":
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return rune(parser.JSONLead[0]), nil
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}
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return 0, errors.New("failed to detect target data serialization format")
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}
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func detectFormat(data string) (string, error) {
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jsonIdx := strings.Index(data, "{")
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yamlIdx := strings.Index(data, ":")
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tomlIdx := strings.Index(data, "=")
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if jsonIdx != -1 && (yamlIdx == -1 || jsonIdx < yamlIdx) && (tomlIdx == -1 || jsonIdx < tomlIdx) {
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return "json", nil
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}
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if yamlIdx != -1 && (tomlIdx == -1 || yamlIdx < tomlIdx) {
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return "yaml", nil
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}
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if tomlIdx != -1 {
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return "toml", nil
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}
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return "", errors.New("failed to detect data serialization format")
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}
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