This does not work in cases where someone want to use a Transformer in a
streaming context (e.g. to create a Reader or Writer or to include the
Transform in a Chain).
It may we useful to add something like strings.Replacer in runes as well.
Alternatively, I have once implemented a generic rewriter for package runes
that makes it much easier to create a Transform for arbitrary rewrites than
writing one from scratch. It is a bit more involved than a Replacer. It
was deemed a bit out of place in the runes package, so it was never
submitted. I could add it to my github repo, though, if there is any
interest.
On Sat, Jun 25, 2016 at 5:47 PM, Matt Harden <matt.har...@gmail.com> wrote:
> Sorry, make that
>
> strings.NewReplacer("\r\n", "\r\n", "\n", "\r\n").Replace(mystring)
>
> On Sat, Jun 25, 2016 at 8:46 AM Matt Harden <matt.har...@gmail.com> wrote:
>
>> Don't use x/text/runes for this. It's overkill.
>>
>> import "strings"
>> ...
>> strings.NewReplacer("\r\n", "\r\n", "\r", "\r\n").Replace(mystring)
>>
>>
>> On Fri, Jun 24, 2016 at 2:00 PM mhhcbon <cpasmaboiteas...@gmail.com>
>> wrote:
>>
>>> I forgot to mention another difficulty i have using replacement.
>>>
>>> As it will receive only one rune at a time in
>>> runes.Map(func(r rune) rune {})
>>>
>>> If the file already contains \r\n, i guess i will be doubling the \r,
>>> resulting in an ugly \r\r\n
>>>
>>> Any ideas ?
>>>
>>>
>>>
>>> Le vendredi 24 juin 2016 22:54:35 UTC+2, mhhcbon a écrit :
>>>>
>>>> Hi,
>>>>
>>>> I have a small func like this
>>>>
>>>>
>>>> func WriteAsWindows1252 (src string, dst string) error {
>>>> bSrc, err := ioutil.ReadFile(src)
>>>> if err != nil {
>>>> return err
>>>> }
>>>>
>>>> bDst := make([]byte, len(bSrc)*2)
>>>> replaceNonAscii := runes.Map(func(r rune) rune {
>>>> if r > unicode.MaxASCII {
>>>> return rune('?')
>>>> }
>>>> return r
>>>> })
>>>> transformer := transform.Chain(replaceNonAscii, charmap.Windows1252.
>>>> NewEncoder())
>>>> _, _, err = transformer.Transform(bDst, bSrc, true)
>>>> if err != nil {
>>>> return err
>>>> }
>>>>
>>>> return ioutil.WriteFile(dst, bDst, 0644)
>>>> }
>>>>
>>>> I would like to add a new replacement of \n to \r\n.
>>>>
>>>> I don't see how i can do that as rune can take only \r or \n but not
>>>> both. And runes.Map take a function which returns a unique rune. If i don t
>>>> mistake.
>>>>
>>>> Is there a way to achieve this with Chain ? Or i got to go with a
>>>> []byte.Replace https://golang.org/pkg/bytes/#Replace ?
>>>>
>>>> BTW, is it the correct way to encode an utf-8 file to windows1252 ?
>>>>
>>>> thanks!
>>>>
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