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Diffstat (limited to 'config/parser.go')
-rw-r--r--config/parser.go428
1 files changed, 10 insertions, 418 deletions
diff --git a/config/parser.go b/config/parser.go
index edaf1944..c56a68d5 100644
--- a/config/parser.go
+++ b/config/parser.go
@@ -2,13 +2,21 @@ package config
import (
"bufio"
- "bytes"
"errors"
"fmt"
"io"
- "strings"
)
+// ParseConfig reads and parses Git configuration entries from r.
+func ParseConfig(r io.Reader) (*Config, error) {
+ parser := &configParser{
+ reader: bufio.NewReader(r),
+ lineNum: 1,
+ }
+
+ return parser.parse()
+}
+
type configParser struct {
reader *bufio.Reader
lineNum int
@@ -78,419 +86,3 @@ func (p *configParser) parse() (*Config, error) {
return cfg, nil
}
-
-func (p *configParser) nextChar() (byte, error) {
- if p.hasPeeked {
- p.hasPeeked = false
-
- return p.peeked, nil
- }
-
- ch, err := p.reader.ReadByte()
- if err != nil {
- return 0, err
- }
-
- if ch == '\r' {
- next, err := p.reader.ReadByte()
- if err == nil && next == '\n' {
- ch = '\n'
- } else if err == nil {
- // Weird but ok
- _ = p.reader.UnreadByte()
- }
- }
-
- if ch == '\n' {
- p.lineNum++
- }
-
- return ch, nil
-}
-
-func (p *configParser) unreadChar(ch byte) {
- p.peeked = ch
-
- p.hasPeeked = true
- if ch == '\n' && p.lineNum > 1 {
- p.lineNum--
- }
-}
-
-func (p *configParser) skipBOM() error {
- first, err := p.reader.ReadByte()
- if errors.Is(err, io.EOF) {
- return nil
- }
-
- if err != nil {
- return err
- }
-
- if first != 0xef {
- _ = p.reader.UnreadByte()
-
- return nil
- }
-
- second, err := p.reader.ReadByte()
- if err != nil {
- if errors.Is(err, io.EOF) {
- _ = p.reader.UnreadByte()
-
- return nil
- }
-
- return err
- }
-
- third, err := p.reader.ReadByte()
- if err != nil {
- if errors.Is(err, io.EOF) {
- _ = p.reader.UnreadByte()
- _ = p.reader.UnreadByte()
-
- return nil
- }
-
- return err
- }
-
- if second == 0xbb && third == 0xbf {
- return nil
- }
-
- _ = p.reader.UnreadByte()
- _ = p.reader.UnreadByte()
- _ = p.reader.UnreadByte()
-
- return nil
-}
-
-func (p *configParser) skipToEOL() error {
- for {
- ch, err := p.nextChar()
- if err != nil {
- return err
- }
-
- if ch == '\n' {
- return nil
- }
- }
-}
-
-func (p *configParser) parseSection() error {
- var name bytes.Buffer
-
- for {
- ch, err := p.nextChar()
- if err != nil {
- return errors.New("unexpected EOF in section header")
- }
-
- if ch == ']' {
- section := name.String()
- if !isValidSection(section) {
- return fmt.Errorf("invalid section name: %q", section)
- }
-
- p.currentSection = strings.ToLower(section)
- p.currentSubsec = ""
-
- return nil
- }
-
- if isWhitespace(ch) {
- return p.parseExtendedSection(&name)
- }
-
- if !isKeyChar(ch) && ch != '.' {
- return fmt.Errorf("invalid character in section name: %q", ch)
- }
-
- name.WriteByte(toLower(ch))
- }
-}
-
-func (p *configParser) parseExtendedSection(sectionName *bytes.Buffer) error {
- for {
- ch, err := p.nextChar()
- if err != nil {
- return errors.New("unexpected EOF in section header")
- }
-
- if !isWhitespace(ch) {
- if ch != '"' {
- return errors.New("expected quote after section name")
- }
-
- break
- }
- }
-
- var subsec bytes.Buffer
-
- for {
- ch, err := p.nextChar()
- if err != nil {
- return errors.New("unexpected EOF in subsection")
- }
-
- if ch == '\n' {
- return errors.New("newline in subsection")
- }
-
- if ch == '"' {
- break
- }
-
- if ch == '\\' {
- next, err := p.nextChar()
- if err != nil {
- return errors.New("unexpected EOF after backslash in subsection")
- }
-
- if next == '\n' {
- return errors.New("newline after backslash in subsection")
- }
-
- subsec.WriteByte(next)
- } else {
- subsec.WriteByte(ch)
- }
- }
-
- ch, err := p.nextChar()
- if err != nil {
- return errors.New("unexpected EOF after subsection")
- }
-
- if ch != ']' {
- return fmt.Errorf("expected ']' after subsection, got %q", ch)
- }
-
- section := sectionName.String()
- if !isValidSection(section) {
- return fmt.Errorf("invalid section name: %q", section)
- }
-
- p.currentSection = strings.ToLower(section)
- p.currentSubsec = subsec.String()
-
- return nil
-}
-
-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
-}
-
-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)
- }
-}
generated by cgit v1.3.1-10-gc9f91 (git 2.54.0) at 2026-05-25 12:54:11 +0000