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Diffstat (limited to 'config/config.go')
-rw-r--r--config/config.go333
1 files changed, 283 insertions, 50 deletions
diff --git a/config/config.go b/config/config.go
index 5c798cea..dd973ab6 100644
--- a/config/config.go
+++ b/config/config.go
@@ -7,8 +7,9 @@ import (
"errors"
"fmt"
"io"
+ "math"
+ "strconv"
"strings"
- "unicode"
)
// Config holds all parsed configuration entries from a Git config file.
@@ -23,6 +24,80 @@ type Config struct {
entries []ConfigEntry
}
+// ValueKind describes the presence and form of a config value.
+type ValueKind uint8
+
+const (
+ // ValueMissing means the queried key does not exist.
+ ValueMissing ValueKind = iota
+ // ValueValueless means the key exists but has no "= <value>" part.
+ ValueValueless
+ // ValueString means the key exists and has an explicit value (possibly "").
+ ValueString
+)
+
+// LookupResult is a value returned by Lookup/LookupAll.
+type LookupResult struct {
+ Kind ValueKind
+ Value string
+}
+
+// String returns the explicit string value.
+func (r LookupResult) String() (string, error) {
+ switch r.Kind {
+ case ValueMissing:
+ return "", errors.New("missing config value")
+ case ValueValueless:
+ return "", errors.New("valueless config key")
+ case ValueString:
+ return r.Value, nil
+ default:
+ return "", fmt.Errorf("unknown value kind %d", r.Kind)
+ }
+}
+
+// Bool interprets this lookup result using Git config boolean rules.
+func (r LookupResult) Bool() (bool, error) {
+ switch r.Kind {
+ case ValueMissing:
+ return false, errors.New("missing config value")
+ case ValueValueless:
+ return true, nil
+ case ValueString:
+ return parseBool(r.Value)
+ default:
+ return false, fmt.Errorf("unknown value kind %d", r.Kind)
+ }
+}
+
+// Int interprets this lookup result as a Git integer value.
+func (r LookupResult) Int() (int, error) {
+ switch r.Kind {
+ case ValueMissing:
+ return 0, errors.New("missing config value")
+ case ValueValueless:
+ return 0, errors.New("valueless config key")
+ case ValueString:
+ return parseInt(r.Value)
+ default:
+ return 0, fmt.Errorf("unknown value kind %d", r.Kind)
+ }
+}
+
+// Int64 interprets this lookup result as a Git int64 value.
+func (r LookupResult) Int64() (int64, error) {
+ switch r.Kind {
+ case ValueMissing:
+ return 0, errors.New("missing config value")
+ case ValueValueless:
+ return 0, errors.New("valueless config key")
+ case ValueString:
+ return parseInt64(r.Value)
+ default:
+ return 0, fmt.Errorf("unknown value kind %d", r.Kind)
+ }
+}
+
// ConfigEntry represents a single parsed configuration directive.
type ConfigEntry struct {
// The section name in canonical lowercase form.
@@ -31,6 +106,8 @@ type ConfigEntry struct {
Subsection string
// The key name in canonical lowercase form.
Key string
+ // Kind records whether this entry has no value or an explicit value.
+ Kind ValueKind
// The interpreted value of the configuration entry, including unescaped
// characters where appropriate.
Value string
@@ -45,31 +122,38 @@ func ParseConfig(r io.Reader) (*Config, error) {
return parser.parse()
}
-// Get retrieves the first value for a given section, optional subsection, and key.
-// Returns an empty string if not found.
-func (c *Config) Get(section, subsection, key string) string {
+// Lookup retrieves the first value for a given section, optional subsection,
+// and key.
+func (c *Config) Lookup(section, subsection, key string) LookupResult {
section = strings.ToLower(section)
key = strings.ToLower(key)
for _, entry := range c.entries {
if strings.EqualFold(entry.Section, section) &&
entry.Subsection == subsection &&
strings.EqualFold(entry.Key, key) {
- return entry.Value
+ return LookupResult{
+ Kind: entry.Kind,
+ Value: entry.Value,
+ }
}
}
- return ""
+ return LookupResult{Kind: ValueMissing}
}
-// GetAll retrieves all values for a given section, optional subsection, and key.
-func (c *Config) GetAll(section, subsection, key string) []string {
+// LookupAll retrieves all values for a given section, optional subsection,
+// and key.
+func (c *Config) LookupAll(section, subsection, key string) []LookupResult {
section = strings.ToLower(section)
key = strings.ToLower(key)
- var values []string
+ var values []LookupResult
for _, entry := range c.entries {
if strings.EqualFold(entry.Section, section) &&
entry.Subsection == subsection &&
strings.EqualFold(entry.Key, key) {
- values = append(values, entry.Value)
+ values = append(values, LookupResult{
+ Kind: entry.Kind,
+ Value: entry.Value,
+ })
}
}
return values
@@ -88,7 +172,7 @@ type configParser struct {
lineNum int
currentSection string
currentSubsec string
- peeked rune
+ peeked byte
hasPeeked bool
}
@@ -108,8 +192,8 @@ func (p *configParser) parse() (*Config, error) {
return nil, err
}
- // Skip whitespace and newlines
- if ch == '\n' || unicode.IsSpace(ch) {
+ // Skip leading whitespace between entries.
+ if isWhitespace(ch) {
continue
}
@@ -130,7 +214,7 @@ func (p *configParser) parse() (*Config, error) {
}
// Key-value pair
- if unicode.IsLetter(ch) {
+ if isLetter(ch) {
p.unreadChar(ch)
if err := p.parseKeyValue(cfg); err != nil {
return nil, fmt.Errorf("furgit: config: line %d: %w", p.lineNum, err)
@@ -144,24 +228,24 @@ func (p *configParser) parse() (*Config, error) {
return cfg, nil
}
-func (p *configParser) nextChar() (rune, error) {
+func (p *configParser) nextChar() (byte, error) {
if p.hasPeeked {
p.hasPeeked = false
return p.peeked, nil
}
- ch, _, err := p.reader.ReadRune()
+ ch, err := p.reader.ReadByte()
if err != nil {
return 0, err
}
if ch == '\r' {
- next, _, err := p.reader.ReadRune()
+ next, err := p.reader.ReadByte()
if err == nil && next == '\n' {
ch = '\n'
} else if err == nil {
// Weird but ok
- _ = p.reader.UnreadRune()
+ _ = p.reader.UnreadByte()
}
}
@@ -172,7 +256,7 @@ func (p *configParser) nextChar() (rune, error) {
return ch, nil
}
-func (p *configParser) unreadChar(ch rune) {
+func (p *configParser) unreadChar(ch byte) {
p.peeked = ch
p.hasPeeked = true
if ch == '\n' && p.lineNum > 1 {
@@ -181,16 +265,40 @@ func (p *configParser) unreadChar(ch rune) {
}
func (p *configParser) skipBOM() error {
- first, _, err := p.reader.ReadRune()
+ first, err := p.reader.ReadByte()
if errors.Is(err, io.EOF) {
return nil
}
if err != nil {
return err
}
- if first != '\uFEFF' {
- _ = p.reader.UnreadRune()
+ 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
}
@@ -225,7 +333,7 @@ func (p *configParser) parseSection() error {
return nil
}
- if unicode.IsSpace(ch) {
+ if isWhitespace(ch) {
return p.parseExtendedSection(&name)
}
@@ -233,7 +341,7 @@ func (p *configParser) parseSection() error {
return fmt.Errorf("invalid character in section name: %q", ch)
}
- name.WriteRune(unicode.ToLower(ch))
+ name.WriteByte(toLower(ch))
}
}
@@ -243,7 +351,7 @@ func (p *configParser) parseExtendedSection(sectionName *bytes.Buffer) error {
if err != nil {
return errors.New("unexpected EOF in section header")
}
- if !unicode.IsSpace(ch) {
+ if !isWhitespace(ch) {
if ch != '"' {
return errors.New("expected quote after section name")
}
@@ -274,9 +382,9 @@ func (p *configParser) parseExtendedSection(sectionName *bytes.Buffer) error {
if next == '\n' {
return errors.New("newline after backslash in subsection")
}
- subsec.WriteRune(next)
+ subsec.WriteByte(next)
} else {
- subsec.WriteRune(ch)
+ subsec.WriteByte(ch)
}
}
@@ -306,11 +414,14 @@ func (p *configParser) parseKeyValue(cfg *Config) error {
var key bytes.Buffer
for {
ch, err := p.nextChar()
+ if errors.Is(err, io.EOF) {
+ break
+ }
if err != nil {
- return errors.New("unexpected EOF reading key")
+ return err
}
- if ch == '=' || ch == '\n' || unicode.IsSpace(ch) {
+ if ch == '=' || ch == '\n' || isSpace(ch) {
p.unreadChar(ch)
break
}
@@ -319,14 +430,14 @@ func (p *configParser) parseKeyValue(cfg *Config) error {
return fmt.Errorf("invalid character in key: %q", ch)
}
- key.WriteRune(unicode.ToLower(ch))
+ key.WriteByte(toLower(ch))
}
keyStr := key.String()
if len(keyStr) == 0 {
return errors.New("empty key name")
}
- if !unicode.IsLetter(rune(keyStr[0])) {
+ if !isLetter(keyStr[0]) {
return errors.New("key must start with a letter")
}
@@ -337,7 +448,8 @@ func (p *configParser) parseKeyValue(cfg *Config) error {
Section: p.currentSection,
Subsection: p.currentSubsec,
Key: keyStr,
- Value: "true",
+ Kind: ValueValueless,
+ Value: "",
})
return nil
}
@@ -350,7 +462,8 @@ func (p *configParser) parseKeyValue(cfg *Config) error {
Section: p.currentSection,
Subsection: p.currentSubsec,
Key: keyStr,
- Value: "true",
+ Kind: ValueValueless,
+ Value: "",
})
return nil
}
@@ -363,7 +476,8 @@ func (p *configParser) parseKeyValue(cfg *Config) error {
Section: p.currentSection,
Subsection: p.currentSubsec,
Key: keyStr,
- Value: "true",
+ Kind: ValueValueless,
+ Value: "",
})
return nil
}
@@ -372,7 +486,7 @@ func (p *configParser) parseKeyValue(cfg *Config) error {
break
}
- if !unicode.IsSpace(ch) {
+ if !isSpace(ch) {
return fmt.Errorf("unexpected character after key: %q", ch)
}
}
@@ -386,6 +500,7 @@ func (p *configParser) parseKeyValue(cfg *Config) error {
Section: p.currentSection,
Subsection: p.currentSubsec,
Key: keyStr,
+ Kind: ValueString,
Value: value,
})
@@ -405,9 +520,9 @@ func (p *configParser) parseValue() (string, error) {
return "", errors.New("unexpected EOF in quoted value")
}
if trimLen > 0 {
- return value.String()[:trimLen], nil
+ return truncateAtNUL(value.String()[:trimLen]), nil
}
- return value.String(), nil
+ return truncateAtNUL(value.String()), nil
}
if err != nil {
return "", err
@@ -418,21 +533,21 @@ func (p *configParser) parseValue() (string, error) {
return "", errors.New("newline in quoted value")
}
if trimLen > 0 {
- return value.String()[:trimLen], nil
+ return truncateAtNUL(value.String()[:trimLen]), nil
}
- return value.String(), nil
+ return truncateAtNUL(value.String()), nil
}
if inComment {
continue
}
- if unicode.IsSpace(ch) && !inQuote {
+ if isWhitespace(ch) && !inQuote {
if trimLen == 0 && value.Len() > 0 {
trimLen = value.Len()
}
if value.Len() > 0 {
- value.WriteRune(ch)
+ value.WriteByte(ch)
}
continue
}
@@ -459,13 +574,13 @@ func (p *configParser) parseValue() (string, error) {
case '\n':
continue
case 'n':
- value.WriteRune('\n')
+ value.WriteByte('\n')
case 't':
- value.WriteRune('\t')
+ value.WriteByte('\t')
case 'b':
- value.WriteRune('\b')
+ value.WriteByte('\b')
case '\\', '"':
- value.WriteRune(next)
+ value.WriteByte(next)
default:
return "", fmt.Errorf("invalid escape sequence: \\%c", next)
}
@@ -477,7 +592,7 @@ func (p *configParser) parseValue() (string, error) {
continue
}
- value.WriteRune(ch)
+ value.WriteByte(ch)
}
}
@@ -485,14 +600,132 @@ func isValidSection(s string) bool {
if len(s) == 0 {
return false
}
- for _, ch := range s {
- if !unicode.IsLetter(ch) && !unicode.IsDigit(ch) && ch != '-' && ch != '.' {
+ for i := 0; i < len(s); i++ {
+ ch := s[i]
+ if !isLetter(ch) && !isDigit(ch) && ch != '-' && ch != '.' {
return false
}
}
return true
}
-func isKeyChar(ch rune) bool {
- return unicode.IsLetter(ch) || unicode.IsDigit(ch) || ch == '-'
+func isKeyChar(ch byte) bool {
+ return isLetter(ch) || isDigit(ch) || ch == '-'
+}
+
+func parseBool(value string) (bool, error) {
+ switch {
+ case strings.EqualFold(value, "true"),
+ strings.EqualFold(value, "yes"),
+ strings.EqualFold(value, "on"):
+ return true, nil
+ case strings.EqualFold(value, "false"),
+ strings.EqualFold(value, "no"),
+ strings.EqualFold(value, "off"),
+ value == "":
+ return false, nil
+ }
+
+ n, err := parseInt32(value)
+ if err != nil {
+ return false, fmt.Errorf("invalid boolean value %q", value)
+ }
+ return n != 0, nil
+}
+
+func parseInt32(value string) (int32, error) {
+ n64, err := parseInt64WithMax(value, math.MaxInt32)
+ if err != nil {
+ return 0, err
+ }
+ return int32(n64), nil
+}
+
+func parseInt(value string) (int, error) {
+ n64, err := parseInt64WithMax(value, int64(int(^uint(0)>>1)))
+ if err != nil {
+ return 0, err
+ }
+ return int(n64), nil
+}
+
+func parseInt64(value string) (int64, error) {
+ return parseInt64WithMax(value, int64(^uint64(0)>>1))
+}
+
+func parseInt64WithMax(value string, max int64) (int64, error) {
+ if value == "" {
+ return 0, errors.New("empty value")
+ }
+
+ trimmed := strings.TrimLeft(value, " \t\n\r\f\v")
+ if trimmed == "" {
+ return 0, errors.New("empty value")
+ }
+
+ numPart := trimmed
+ factor := int64(1)
+ if last := trimmed[len(trimmed)-1]; last == 'k' || last == 'K' || last == 'm' || last == 'M' || last == 'g' || last == 'G' {
+ switch toLower(last) {
+ case 'k':
+ factor = 1024
+ case 'm':
+ factor = 1024 * 1024
+ case 'g':
+ factor = 1024 * 1024 * 1024
+ }
+ numPart = trimmed[:len(trimmed)-1]
+ }
+ if numPart == "" {
+ return 0, errors.New("missing integer value")
+ }
+
+ n, err := strconv.ParseInt(numPart, 0, 64)
+ if err != nil {
+ return 0, err
+ }
+
+ intMax := max
+ intMin := -max - 1
+ if n > 0 && n > intMax/factor {
+ return 0, errors.New("integer overflow")
+ }
+ if n < 0 && n < intMin/factor {
+ return 0, errors.New("integer overflow")
+ }
+
+ n *= factor
+ return n, nil
+}
+
+func truncateAtNUL(value string) string {
+ for i := 0; i < len(value); i++ {
+ if value[i] == 0 {
+ return value[:i]
+ }
+ }
+ return value
+}
+
+func isSpace(ch byte) bool {
+ return ch == ' ' || ch == '\t'
+}
+
+func isWhitespace(ch byte) bool {
+ return ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r' || ch == '\v' || ch == '\f'
+}
+
+func isLetter(ch byte) bool {
+ return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')
+}
+
+func isDigit(ch byte) bool {
+ return ch >= '0' && ch <= '9'
+}
+
+func toLower(ch byte) byte {
+ if ch >= 'A' && ch <= 'Z' {
+ return ch + ('a' - 'A')
+ }
+ return ch
}
generated by cgit v1.3.1-10-gc9f91 (git 2.54.0) at 2026-05-25 13:32:23 +0000