1 files changed, 111 insertions, 0 deletions
diff --git a/config/value.go b/config/value.go
new file mode 100644
index 00000000..3ade9c16
--- /dev/null
+++ b/config/value.go
@@ -0,0 +1,111 @@
+package config
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+)
+
+func (p *configParser) parseValue() (string, error) {
+	var (
+		value     bytes.Buffer
+		inQuote   bool
+		inComment bool
+	)
+
+	trimLen := 0
+
+	for {
+		ch, err := p.nextChar()
+		if errors.Is(err, io.EOF) {
+			if inQuote {
+				return "", errors.New("unexpected EOF in quoted value")
+			}
+
+			if trimLen > 0 {
+				return truncateAtNUL(value.String()[:trimLen]), nil
+			}
+
+			return truncateAtNUL(value.String()), nil
+		}
+
+		if err != nil {
+			return "", err
+		}
+
+		if ch == '\n' {
+			if inQuote {
+				return "", errors.New("newline in quoted value")
+			}
+
+			if trimLen > 0 {
+				return truncateAtNUL(value.String()[:trimLen]), nil
+			}
+
+			return truncateAtNUL(value.String()), nil
+		}
+
+		if inComment {
+			continue
+		}
+
+		if isWhitespace(ch) && !inQuote {
+			if trimLen == 0 && value.Len() > 0 {
+				trimLen = value.Len()
+			}
+
+			if value.Len() > 0 {
+				value.WriteByte(ch)
+			}
+
+			continue
+		}
+
+		if !inQuote && (ch == '#' || ch == ';') {
+			inComment = true
+
+			continue
+		}
+
+		if trimLen > 0 {
+			trimLen = 0
+		}
+
+		if ch == '\\' {
+			next, err := p.nextChar()
+			if errors.Is(err, io.EOF) {
+				return "", errors.New("unexpected EOF after backslash")
+			}
+
+			if err != nil {
+				return "", err
+			}
+
+			switch next {
+			case '\n':
+				continue
+			case 'n':
+				value.WriteByte('\n')
+			case 't':
+				value.WriteByte('\t')
+			case 'b':
+				value.WriteByte('\b')
+			case '\\', '"':
+				value.WriteByte(next)
+			default:
+				return "", fmt.Errorf("invalid escape sequence: \\%c", next)
+			}
+
+			continue
+		}
+
+		if ch == '"' {
+			inQuote = !inQuote
+
+			continue
+		}
+
+		value.WriteByte(ch)
+	}
+}