config: Split files

1 files changed, 119 insertions, 0 deletions

diff --git a/config/key_value.go b/config/key_value.go
new file mode 100644
index 00000000..482bfcc7
--- /dev/null
+++ b/config/key_value.go
@@ -0,0 +1,119 @@
+package config
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+)
+
+func (p *configParser) parseKeyValue(cfg *Config) error {
+	if p.currentSection == "" {
+		return errors.New("key-value pair before any section header")
+	}
+
+	var key bytes.Buffer
+
+	for {
+		ch, err := p.nextChar()
+		if errors.Is(err, io.EOF) {
+			break
+		}
+
+		if err != nil {
+			return err
+		}
+
+		if ch == '=' || ch == '\n' || isSpace(ch) {
+			p.unreadChar(ch)
+
+			break
+		}
+
+		if !isKeyChar(ch) {
+			return fmt.Errorf("invalid character in key: %q", ch)
+		}
+
+		key.WriteByte(toLower(ch))
+	}
+
+	keyStr := key.String()
+	if len(keyStr) == 0 {
+		return errors.New("empty key name")
+	}
+
+	if !isLetter(keyStr[0]) {
+		return errors.New("key must start with a letter")
+	}
+
+	for {
+		ch, err := p.nextChar()
+		if errors.Is(err, io.EOF) {
+			cfg.entries = append(cfg.entries, ConfigEntry{
+				Section:    p.currentSection,
+				Subsection: p.currentSubsec,
+				Key:        keyStr,
+				Kind:       ValueValueless,
+				Value:      "",
+			})
+
+			return nil
+		}
+
+		if err != nil {
+			return err
+		}
+
+		if ch == '\n' {
+			cfg.entries = append(cfg.entries, ConfigEntry{
+				Section:    p.currentSection,
+				Subsection: p.currentSubsec,
+				Key:        keyStr,
+				Kind:       ValueValueless,
+				Value:      "",
+			})
+
+			return nil
+		}
+
+		if ch == '#' || ch == ';' {
+			err := p.skipToEOL()
+			if err != nil && !errors.Is(err, io.EOF) {
+				return err
+			}
+
+			cfg.entries = append(cfg.entries, ConfigEntry{
+				Section:    p.currentSection,
+				Subsection: p.currentSubsec,
+				Key:        keyStr,
+				Kind:       ValueValueless,
+				Value:      "",
+			})
+
+			return nil
+		}
+
+		if ch == '=' {
+			break
+		}
+
+		if !isSpace(ch) {
+			return fmt.Errorf("unexpected character after key: %q", ch)
+		}
+	}
+
+	value, err := p.parseValue()
+	if err != nil {
+		return err
+	}
+
+	cfg.entries = append(cfg.entries, ConfigEntry{
+		Section:    p.currentSection,
+		Subsection: p.currentSubsec,
+		Key:        keyStr,
+		Kind:       ValueString,
+		Value:      value,
+	})
+
+	return nil
+}