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attr.go
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package gitattr
import (
"bufio"
"bytes"
"io"
"strconv"
"strings"
"github.com/git-lfs/git-lfs/v3/errors"
"github.com/git-lfs/git-lfs/v3/tr"
"github.com/git-lfs/wildmatch/v2"
)
const attrPrefix = "[attr]"
// Line carries a single line from a repository's .gitattributes file, affecting
// a single pattern and applying zero or more attributes.
type Line struct {
// Pattern is a wildmatch pattern that, when matched, indicates that all
// of the below attributes (Attrs) should be applied to that tree entry.
//
// Pattern is relative to the tree in which the .gitattributes was read
// from. For example, /.gitattributes affects all blobs in the
// repository, while /path/to/.gitattributes affects all blobs that are
// direct or indirect children of /path/to.
Pattern *wildmatch.Wildmatch
// Macro is the name of a macro that, when matched, indicates that all
// of the below attributes (Attrs) should be applied to that tree
// entry.
//
// A given entry will have exactly one of Pattern or Macro set.
Macro string
// Attrs is the list of attributes to be applied when the above pattern
// matches a given filename.
//
// It is populated in-order as it was written in the .gitattributes file
// being read, from left to right.
Attrs []*Attr
}
// Attr is a single attribute that may be applied to a file.
type Attr struct {
// K is the name of the attribute. It is commonly, "filter", "diff",
// "merge", or "text".
//
// It will never contain the special "false" shorthand ("-"), or the
// unspecify declarative ("!").
K string
// V is the value held by that attribute. It is commonly "lfs", or
// "false", indicating the special value given by a "-"-prefixed name.
V string
// Unspecified indicates whether or not this attribute was explicitly
// unset by prefixing the keyname with "!".
Unspecified bool
}
// ParseLines parses the given io.Reader "r" line-wise as if it were the
// contents of a .gitattributes file.
//
// If an error was encountered, it will be returned and the []*Line should be
// considered unusable.
func ParseLines(r io.Reader) ([]*Line, string, error) {
var lines []*Line
splitter := &lineEndingSplitter{}
scanner := bufio.NewScanner(r)
scanner.Split(splitter.ScanLines)
for scanner.Scan() {
text := strings.TrimSpace(scanner.Text())
if len(text) == 0 {
continue
}
var pattern string
var applied string
var macro string
switch text[0] {
case '#':
continue
case '"':
var err error
last := strings.LastIndex(text, "\"")
if last == 0 {
return nil, "", errors.New(tr.Tr.Get("unbalanced quote: %s", text))
}
pattern, err = strconv.Unquote(text[:last+1])
if err != nil {
return nil, "", errors.Wrap(err, tr.Tr.Get("unable to unquote: %s", text[:last+1]))
}
applied = strings.TrimSpace(text[last+1:])
default:
splits := strings.SplitN(text, " ", 2)
if strings.HasPrefix(splits[0], attrPrefix) {
macro = splits[0][len(attrPrefix):]
} else {
pattern = splits[0]
}
if len(splits) == 2 {
applied = splits[1]
}
}
var attrs []*Attr
for _, s := range strings.Split(applied, " ") {
if s == "" {
continue
}
var attr Attr
if strings.HasPrefix(s, "-") {
attr.K = strings.TrimPrefix(s, "-")
attr.V = "false"
} else if strings.HasPrefix(s, "!") {
attr.K = strings.TrimPrefix(s, "!")
attr.Unspecified = true
} else if eq := strings.Index(s, "="); eq > -1 {
attr.K = s[:eq]
attr.V = s[eq+1:]
} else {
attr.K = s
attr.V = "true"
}
attrs = append(attrs, &attr)
}
var matchPattern *wildmatch.Wildmatch
if pattern != "" {
matchPattern = wildmatch.NewWildmatch(pattern,
wildmatch.Basename, wildmatch.SystemCase,
wildmatch.GitAttributes,
)
}
lines = append(lines, &Line{
Macro: macro,
Pattern: matchPattern,
Attrs: attrs,
})
}
if err := scanner.Err(); err != nil {
return nil, "", err
}
return lines, splitter.LineEnding(), nil
}
// copies bufio.ScanLines(), counting LF vs CRLF in a file
type lineEndingSplitter struct {
LFCount int
CRLFCount int
}
func (s *lineEndingSplitter) LineEnding() string {
if s.CRLFCount > s.LFCount {
return "\r\n"
} else if s.LFCount == 0 {
return ""
}
return "\n"
}
func (s *lineEndingSplitter) ScanLines(data []byte, atEOF bool) (advance int, token []byte, err error) {
if atEOF && len(data) == 0 {
return 0, nil, nil
}
if i := bytes.IndexByte(data, '\n'); i >= 0 {
// We have a full newline-terminated line.
return i + 1, s.dropCR(data[0:i]), nil
}
// If we're at EOF, we have a final, non-terminated line. Return it.
if atEOF {
return len(data), data, nil
}
// Request more data.
return 0, nil, nil
}
// dropCR drops a terminal \r from the data.
func (s *lineEndingSplitter) dropCR(data []byte) []byte {
if len(data) > 0 && data[len(data)-1] == '\r' {
s.CRLFCount++
return data[0 : len(data)-1]
}
s.LFCount++
return data
}