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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| package gojqextra | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "regexp" | ||
| "strings" | ||
| ) | ||
|
|
||
| // from gojq, see https://github.com/itchyny/gojq/blob/main/LICENSE | ||
| func CompileRegexp(re, allowedFlags, flags string) (*regexp.Regexp, error) { | ||
| if strings.IndexFunc(flags, func(r rune) bool { | ||
| return !strings.ContainsAny(string([]rune{r}), allowedFlags) | ||
| }) >= 0 { | ||
| return nil, fmt.Errorf("unsupported regular expression flag: %q", flags) | ||
| } | ||
| re = strings.ReplaceAll(re, "(?<", "(?P<") | ||
| if strings.ContainsRune(flags, 'i') { | ||
| re = "(?i)" + re | ||
| } | ||
| if strings.ContainsRune(flags, 'm') { | ||
| re = "(?s)" + re | ||
| } | ||
| r, err := regexp.Compile(re) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("invalid regular expression %q: %w", re, err) | ||
| } | ||
| return r, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| package ioextra | ||
|
|
||
| import ( | ||
| "io" | ||
| "math/bits" | ||
| "unicode/utf8" | ||
| ) | ||
|
|
||
| // ByteRuneReader reads each by as a runes from a io.ReadSeeker | ||
| // ex: when used with regexp \u00ff code point will match byte 0xff and not the utf-8 encoded version of 0xff | ||
| type ByteRuneReader struct { | ||
| RS io.ReadSeeker | ||
| } | ||
|
|
||
| func (brr ByteRuneReader) ReadRune() (r rune, size int, err error) { | ||
| var b [1]byte | ||
| _, err = io.ReadFull(brr.RS, b[:]) | ||
| if err != nil { | ||
| return 0, 0, err | ||
| } | ||
| r = rune(b[0]) | ||
| return r, 1, nil | ||
| } | ||
|
|
||
| func (brr ByteRuneReader) Seek(offset int64, whence int) (int64, error) { | ||
| return brr.RS.Seek(offset, whence) | ||
| } | ||
|
|
||
| type RuneReadSeeker struct { | ||
| RS io.ReadSeeker | ||
| } | ||
|
|
||
| func utf8Bytes(b byte) int { | ||
| c := bits.LeadingZeros8(^b) | ||
| // 0b0xxxxxxx 1 byte | ||
| // 0b110xxxxx 2 byte | ||
| // 0b1110xxxx 3 byte | ||
| // 0b11110xxx 4 byte | ||
| switch c { | ||
| case 0: | ||
| return 1 | ||
| case 2, 3, 4: | ||
| return c | ||
| default: | ||
| return -1 | ||
| } | ||
| } | ||
|
|
||
| // RuneReadSeeker reads runs from a io.ReadSeeker | ||
| func (brr RuneReadSeeker) ReadRune() (r rune, size int, err error) { | ||
| var b [utf8.UTFMax]byte | ||
|
|
||
| _, err = io.ReadFull(brr.RS, b[0:1]) | ||
| if err != nil { | ||
| return 0, 0, err | ||
| } | ||
|
|
||
| c := b[0] | ||
| if c < utf8.RuneSelf { | ||
| return rune(c), 1, nil | ||
| } | ||
|
|
||
| ss := utf8Bytes(b[0]) | ||
| if ss < 0 { | ||
| return utf8.RuneError, 1, nil | ||
| } | ||
|
|
||
| _, err = io.ReadFull(brr.RS, b[1:ss]) | ||
| if err != nil { | ||
| return 0, 0, err | ||
| } | ||
|
|
||
| r, s := utf8.DecodeRune(b[0:ss]) | ||
| // possibly rewind if DecodeRune fails as there was a invalid multi byte code point | ||
| // TODO: better way that don't require seek back? buffer? one at a time? | ||
| d := ss - s | ||
| if d > 0 { | ||
| if _, err := brr.Seek(int64(-d), io.SeekCurrent); err != nil { | ||
| return 0, 0, err | ||
| } | ||
| } | ||
|
|
||
| return r, s, nil | ||
| } | ||
|
|
||
| func (brr RuneReadSeeker) Seek(offset int64, whence int) (int64, error) { | ||
| return brr.RS.Seek(offset, whence) | ||
| } |
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