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113 lines
2.5 KiB
113 lines
2.5 KiB
// Parsing keys handling both bare and quoted keys.
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package toml
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import (
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"errors"
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"fmt"
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"unicode"
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)
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// Convert the bare key group string to an array.
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// The input supports double quotation and single quotation,
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// but escape sequences are not supported. Lexers must unescape them beforehand.
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func parseKey(key string) ([]string, error) {
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runes := []rune(key)
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var groups []string
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if len(key) == 0 {
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return nil, errors.New("empty key")
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}
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idx := 0
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for idx < len(runes) {
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for ; idx < len(runes) && isSpace(runes[idx]); idx++ {
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// skip leading whitespace
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}
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if idx >= len(runes) {
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break
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}
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r := runes[idx]
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if isValidBareChar(r) {
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// parse bare key
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startIdx := idx
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endIdx := -1
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idx++
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for idx < len(runes) {
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r = runes[idx]
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if isValidBareChar(r) {
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idx++
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} else if r == '.' {
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endIdx = idx
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break
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} else if isSpace(r) {
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endIdx = idx
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for ; idx < len(runes) && isSpace(runes[idx]); idx++ {
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// skip trailing whitespace
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}
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if idx < len(runes) && runes[idx] != '.' {
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return nil, fmt.Errorf("invalid key character after whitespace: %c", runes[idx])
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}
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break
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} else {
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return nil, fmt.Errorf("invalid bare key character: %c", r)
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}
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}
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if endIdx == -1 {
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endIdx = idx
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}
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groups = append(groups, string(runes[startIdx:endIdx]))
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} else if r == '\'' {
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// parse single quoted key
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idx++
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startIdx := idx
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for {
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if idx >= len(runes) {
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return nil, fmt.Errorf("unclosed single-quoted key")
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}
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r = runes[idx]
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if r == '\'' {
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groups = append(groups, string(runes[startIdx:idx]))
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idx++
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break
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}
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idx++
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}
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} else if r == '"' {
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// parse double quoted key
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idx++
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startIdx := idx
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for {
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if idx >= len(runes) {
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return nil, fmt.Errorf("unclosed double-quoted key")
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}
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r = runes[idx]
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if r == '"' {
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groups = append(groups, string(runes[startIdx:idx]))
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idx++
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break
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}
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idx++
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}
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} else if r == '.' {
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idx++
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if idx >= len(runes) {
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return nil, fmt.Errorf("unexpected end of key")
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}
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r = runes[idx]
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if !isValidBareChar(r) && r != '\'' && r != '"' && r != ' ' {
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return nil, fmt.Errorf("expecting key part after dot")
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}
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} else {
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return nil, fmt.Errorf("invalid key character: %c", r)
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}
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}
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if len(groups) == 0 {
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return nil, fmt.Errorf("empty key")
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}
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return groups, nil
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}
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func isValidBareChar(r rune) bool {
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return isAlphanumeric(r) || r == '-' || unicode.IsNumber(r)
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}
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