Sasha Koshka
43084fb5bb
This should actually make migration from Caddy easier, because Caddy's YAML front matter seems to support quoted strings? IDK, the current Holanet has them. Closes #11
73 lines
2.0 KiB
Go
73 lines
2.0 KiB
Go
package step
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import "strconv"
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import "strings"
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const metaRule = "---"
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// Meta represents optional metadata that can occur at the very start of
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// a document.
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type Meta = map[string] string
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// SplitMeta parses the metadata (if it exists), returning a map representing it
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// along with the rest of the input as a string. If there is no metadata, an
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// empty map will be returned.
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func SplitMeta (input string) (Meta, string, error) {
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// i hate crlf!!!!! uwehhh!!! TODO remove
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input = strings.ReplaceAll(input, "\r\n", "\n")
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// TODO call internal function that takes in an io.Reader and scans it
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// by line instead of operating directly on the string. have that call
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// yet another function which will solve #11
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// stop if there is no metadata
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if !strings.HasPrefix(input, metaRule + "\n") {
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return Meta { }, input, nil
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}
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// get the start and the end of the metadata
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input = strings.TrimPrefix(input, metaRule)
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index := strings.Index(input, "\n" + metaRule + "\n")
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if index < 0 {
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return nil, "", ErrMetaNeverClosed
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}
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metaStr := input[:index]
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bodyStr := input[index + len(metaRule) + 2:]
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// parse metadata
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meta, err := ParseMeta(metaStr)
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if err != nil { return Meta { }, "", err }
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return meta, bodyStr, nil
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}
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// ParseMeta parses isolated metadata (without the horizontal starting and
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// ending rules).
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func ParseMeta (input string) (Meta, error) {
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meta := make(Meta)
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for _, line := range strings.Split(input, "\n") {
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line = strings.TrimSpace(line)
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if line == "" { continue }
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key, value, ok := strings.Cut(line, ":")
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if !ok {
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return nil, ErrMetaMalformed
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}
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key = strings.ToLower(strings.TrimSpace(key))
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value = strings.TrimSpace(value)
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if strings.HasPrefix(value, "\"") || strings.HasPrefix(value, "'") {
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unquoted, err := strconv.Unquote(value)
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if err != nil {
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return nil, err
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}
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value = unquoted
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}
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if key == "" {
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return nil, ErrMetaMalformed
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}
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if _, exists := meta[key]; exists {
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return nil, ErrMetaDuplicateKey
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}
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meta[key] = value
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}
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return meta, nil
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}
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