86 lines
1.7 KiB
Go
86 lines
1.7 KiB
Go
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// Parsing keys handling both bare and quoted keys.
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package toml
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import (
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"bytes"
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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 to allow "." inside the key name,
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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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groups := []string{}
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var buffer bytes.Buffer
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inQuotes := false
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wasInQuotes := false
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ignoreSpace := true
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expectDot := false
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for _, char := range key {
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if ignoreSpace {
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if char == ' ' {
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continue
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}
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ignoreSpace = false
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}
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switch char {
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case '"':
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if inQuotes {
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groups = append(groups, buffer.String())
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buffer.Reset()
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wasInQuotes = true
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}
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inQuotes = !inQuotes
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expectDot = false
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case '.':
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if inQuotes {
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buffer.WriteRune(char)
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} else {
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if !wasInQuotes {
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if buffer.Len() == 0 {
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return nil, errors.New("empty table key")
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}
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groups = append(groups, buffer.String())
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buffer.Reset()
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}
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ignoreSpace = true
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expectDot = false
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wasInQuotes = false
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}
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case ' ':
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if inQuotes {
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buffer.WriteRune(char)
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} else {
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expectDot = true
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}
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default:
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if !inQuotes && !isValidBareChar(char) {
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return nil, fmt.Errorf("invalid bare character: %c", char)
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}
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if !inQuotes && expectDot {
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return nil, errors.New("what?")
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}
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buffer.WriteRune(char)
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expectDot = false
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}
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}
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if inQuotes {
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return nil, errors.New("mismatched quotes")
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}
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if buffer.Len() > 0 {
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groups = append(groups, buffer.String())
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}
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if len(groups) == 0 {
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return nil, errors.New("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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