79 lines
2.4 KiB
Go
79 lines
2.4 KiB
Go
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package xgbsel
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import "io"
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import "strings"
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// Data represents a polymorphic data structure
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type Data interface {
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Convert (Target) (reader io.ReadSeekCloser, ok bool)
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Supported () []Target
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}
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// Target represents an X selection target. It defines the type of data stored
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// within an X selection. This data may be a mime type, or a more specific name
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// that is unique to X. A list of these names can be found here:
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// https://tronche.com/gui/x/icccm/sec-2.html#s-2.6.2
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type Target string
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type Confidence int; const (
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ConfidenceNone Confidence = iota
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ConfidencePartial
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ConfidenceFull
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)
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// ToMime converts the specified target to a MIME type. Because a single MIME
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// type may correspond to several targets, a confidence value is returned
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// representing how good of a match it is. If data is represented by multiple
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// targets, they can be checked one after the other and the one with the highest
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// confidence value chosen.
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func (target Target) ToMime () (string, Confidence) {
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// TODO: add other stuff. reference this table:
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// https://tronche.com/gui/x/icccm/sec-2.html#s-2.6.2
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// perhaps we should also have parameters for mime types so we can
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// return an encoding here for things like STRING?
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switch target {
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case "ADOBE_PORTABLE_DOCUMENT_FORMAT":
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return "application/pdf", ConfidenceFull
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case "APPLE_PICT":
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return "image/pict", ConfidenceFull
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case
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"POSTSCRIPT",
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"ENCAPSULATED_POSTSCRIPT",
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"ENCAPSULATED_POSTSCRIPT_INTERCHANGE":
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return "application/postscript", ConfidenceFull
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case "FILE_NAME":
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return "text/uri-list", ConfidenceFull
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case "UTF8_STRING":
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return "text/plain", ConfidenceFull
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case "TEXT":
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return "text/plain", ConfidencePartial
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case "STRING":
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return "text/plain", ConfidencePartial
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default:
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if strings.Count(string(target), "/") == 1 {
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return string(target), ConfidenceFull
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} else {
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return "", ConfidenceNone
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}
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}
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}
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// MimeToTargets returns a list of targets that correspond to a specified MIME
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// type.
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func MimeToTargets (mime string) []Target {
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targets := []Target { Target(mime) }
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switch mime {
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case "application/pdf":
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targets = append(targets, "ADOBE_PORTABLE_DOCUMENT_FORMAT")
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case "image/pict":
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targets = append(targets, "APPLE_PICT")
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case "application/postscript":
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targets = append(targets, "POSTSCRIPT")
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case "text/uri-list":
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targets = append(targets, "FILE_NAME")
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case "text/plain":
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targets = append(targets, "UTF8_STRING", "TEXT", "STRING")
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}
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return targets
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}
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