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|
// Parsing keys handling both bare and quoted keys.
package toml
import (
"bytes"
"fmt"
"unicode"
)
func parseKey(key string) ([]string, error) {
groups := []string{}
var buffer bytes.Buffer
inQuotes := false
wasInQuotes := false
escapeNext := false
ignoreSpace := true
expectDot := false
for _, char := range key {
if ignoreSpace {
if char == ' ' {
continue
}
ignoreSpace = false
}
if escapeNext {
buffer.WriteRune(char)
escapeNext = false
continue
}
switch char {
case '\\':
escapeNext = true
continue
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, fmt.Errorf("empty key group")
}
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, fmt.Errorf("what?")
}
buffer.WriteRune(char)
expectDot = false
}
}
if inQuotes {
return nil, fmt.Errorf("mismatched quotes")
}
if escapeNext {
return nil, fmt.Errorf("unfinished escape sequence")
}
if buffer.Len() > 0 {
groups = append(groups, buffer.String())
}
if len(groups) == 0 {
return nil, fmt.Errorf("empty key")
}
return groups, nil
}
func isValidBareChar(r rune) bool {
return isAlphanumeric(r) || r == '-' || unicode.IsNumber(r)
}
|
