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package interp
import (
"io"
"regexp"
"strings"
"github.com/wader/fq/internal/gojqex"
"github.com/wader/fq/internal/ioex"
"github.com/wader/fq/pkg/bitio"
"github.com/wader/fq/pkg/ranges"
"github.com/wader/gojq"
)
func init() {
RegisterIter2("_match_binary", (*Interp)._binaryMatch)
}
func (i *Interp) _binaryMatch(c any, pattern any, flags string) gojq.Iter {
bv, err := toBinary(c)
if err != nil {
return gojq.NewIter(err)
}
var re string
var byteRunes bool
var global bool
switch pattern := pattern.(type) {
case string:
re = pattern
default:
reBuf, err := toBytes(pattern)
if err != nil {
return gojq.NewIter(err)
}
var reRs []rune
for _, b := range reBuf {
reRs = append(reRs, rune(b))
}
byteRunes = true
// escape parentheses runes etc
re = regexp.QuoteMeta(string(reRs))
}
if strings.Contains(flags, "b") {
byteRunes = true
}
global = strings.Contains(flags, "g")
// TODO: err to string
// TODO: extract to regexpextra? "all" FindReaderSubmatchIndex that can iter?
sre, err := gojqex.CompileRegexp(re, "gimb", flags)
if err != nil {
return gojq.NewIter(err)
}
sreNames := sre.SubexpNames()
br, err := bv.toReader()
if err != nil {
return gojq.NewIter(err)
}
var rr interface {
io.RuneReader
io.Seeker
}
// raw bytes regexp matching is a bit tricky, what we do is to read each byte as a codepoint (ByteRuneReader)
// and then we can use UTF-8 encoded codepoint to match a raw byte. So for example \u00ff (encoded as 0xc3 0xbf)
// will match the byte \0xff
if byteRunes {
// byte mode, read each byte as a rune
rr = ioex.ByteRuneReader{RS: bitio.NewIOReadSeeker(br)}
} else {
rr = ioex.RuneReadSeeker{RS: bitio.NewIOReadSeeker(br)}
}
var off int64
prevOff := int64(-1)
return iterFn(func() (any, bool) {
// TODO: correct way to handle empty match for binary, move one byte forward?
// > "asdasd" | [match(""; "g")], [(tobytes | match(""; "g"))] | length
// 7
// 1
if prevOff == off {
return nil, false
}
if prevOff != -1 && !global {
return nil, false
}
_, err = rr.Seek(off, io.SeekStart)
if err != nil {
return err, false
}
l := sre.FindReaderSubmatchIndex(rr)
if l == nil {
return nil, false
}
var captures []any
var firstCapture map[string]any
for i := 0; i < len(l)/2; i++ {
start, end := l[i*2], l[i*2+1]
capture := map[string]any{
"offset": int(off) + start,
"length": end - start,
}
if start != -1 {
matchBitOff := (off + int64(start)) * 8
matchLength := int64(end-start) * 8
bbo := Binary{
br: bv.br,
r: ranges.Range{
Start: bv.r.Start + matchBitOff,
Len: matchLength,
},
unit: 8,
}
capture["string"] = bbo
} else {
capture["string"] = nil
}
if i > 0 {
if sreNames[i] != "" {
capture["name"] = sreNames[i]
} else {
capture["name"] = nil
}
}
if i == 0 {
firstCapture = capture
}
captures = append(captures, capture)
}
prevOff = off
off = off + int64(l[1])
firstCapture["captures"] = captures[1:]
return firstCapture, true
})
}
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