62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
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package settings
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import (
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"bufio"
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"fmt"
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"io"
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"strings"
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)
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var (
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KeyValueDelimiterChars = []byte{':', '='}
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ErrNoValidDelimiter = fmt.Errorf("no valid delimiter found (use %s)", KeyValueDelimiterCharsToString())
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)
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func KeyValueDelimiterCharsToString() string {
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var builder strings.Builder
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for i, char := range KeyValueDelimiterChars {
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builder.WriteString(fmt.Sprintf("'%c'", char))
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if i < len(KeyValueDelimiterChars)-1 {
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builder.WriteString(" or ")
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}
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}
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return builder.String()
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}
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func LineIsComment(line string) bool {
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return strings.HasPrefix(line, "//") || strings.HasPrefix(line, "#")
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}
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type Scanner struct {
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lineNumber int
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scanner *bufio.Scanner
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}
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// returns errors without any key/value.
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// does not clone the strings it extracted.
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func (s *Scanner) ReadNextLine() (key, value string, err error) {
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for s.scanner.Scan() {
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s.lineNumber++
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line := strings.TrimSpace(s.scanner.Text())
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if len(line) == 0 || LineIsComment(line) {
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continue
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}
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splitIndex := strings.IndexAny(line, string(KeyValueDelimiterChars))
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if splitIndex == -1 {
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return "", "", fmt.Errorf("line %d: %w", s.lineNumber, ErrNoValidDelimiter)
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}
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key = strings.TrimSpace(line[:splitIndex])
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value = strings.TrimSpace(line[splitIndex+1:])
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return
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}
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return "", "", io.EOF
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}
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func NewScanner(r io.Reader) *Scanner {
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return &Scanner{
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lineNumber: 0,
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scanner: bufio.NewScanner(r),
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}
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}
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