86 lines
1.7 KiB
Go
86 lines
1.7 KiB
Go
// Parsing keys handling both bare and quoted keys.
|
|
|
|
package toml
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"fmt"
|
|
"unicode"
|
|
)
|
|
|
|
// Convert the bare key group string to an array.
|
|
// The input supports double quotation to allow "." inside the key name,
|
|
// but escape sequences are not supported. Lexers must unescape them beforehand.
|
|
func parseKey(key string) ([]string, error) {
|
|
groups := []string{}
|
|
var buffer bytes.Buffer
|
|
inQuotes := false
|
|
wasInQuotes := false
|
|
ignoreSpace := true
|
|
expectDot := false
|
|
|
|
for _, char := range key {
|
|
if ignoreSpace {
|
|
if char == ' ' {
|
|
continue
|
|
}
|
|
ignoreSpace = false
|
|
}
|
|
switch char {
|
|
case '"':
|
|
if inQuotes {
|
|
groups = append(groups, buffer.String())
|
|
buffer.Reset()
|
|
wasInQuotes = true
|
|
}
|
|
inQuotes = !inQuotes
|
|
expectDot = false
|
|
case '.':
|
|
if inQuotes {
|
|
buffer.WriteRune(char)
|
|
} else {
|
|
if !wasInQuotes {
|
|
if buffer.Len() == 0 {
|
|
return nil, errors.New("empty table key")
|
|
}
|
|
groups = append(groups, buffer.String())
|
|
buffer.Reset()
|
|
}
|
|
ignoreSpace = true
|
|
expectDot = false
|
|
wasInQuotes = false
|
|
}
|
|
case ' ':
|
|
if inQuotes {
|
|
buffer.WriteRune(char)
|
|
} else {
|
|
expectDot = true
|
|
}
|
|
default:
|
|
if !inQuotes && !isValidBareChar(char) {
|
|
return nil, fmt.Errorf("invalid bare character: %c", char)
|
|
}
|
|
if !inQuotes && expectDot {
|
|
return nil, errors.New("what?")
|
|
}
|
|
buffer.WriteRune(char)
|
|
expectDot = false
|
|
}
|
|
}
|
|
if inQuotes {
|
|
return nil, errors.New("mismatched quotes")
|
|
}
|
|
if buffer.Len() > 0 {
|
|
groups = append(groups, buffer.String())
|
|
}
|
|
if len(groups) == 0 {
|
|
return nil, errors.New("empty key")
|
|
}
|
|
return groups, nil
|
|
}
|
|
|
|
func isValidBareChar(r rune) bool {
|
|
return isAlphanumeric(r) || r == '-' || unicode.IsNumber(r)
|
|
}
|