mirror of
https://github.com/go-sylixos/elvish.git
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66 lines
1.9 KiB
Go
66 lines
1.9 KiB
Go
package eval
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import "strings"
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// SplitVariableRef splits a variable reference into the sigil and the
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// (qualified) name.
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func SplitVariableRef(ref string) (sigil string, qname string) {
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if ref == "" {
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return "", ""
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}
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switch ref[0] {
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case '@':
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// TODO(xiaq): Support % later.
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return ref[:1], ref[1:]
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default:
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return "", ref
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}
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}
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// SplitQNameNs splits a qualified variable name into the namespace part and the
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// name part.
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func SplitQNameNs(qname string) (ns, name string) {
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if qname == "" {
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return "", ""
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}
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colon := strings.LastIndexByte(qname[:len(qname)-1], ':')
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// If colon is -1, colon+1 will be 0, rendering an empty ns.
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return qname[:colon+1], qname[colon+1:]
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}
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// SplitQNameNs splits an incomplete qualified variable name into the namespace
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// part and the name part.
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func SplitQNameNsIncomplete(qname string) (ns, name string) {
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colon := strings.LastIndexByte(qname, ':')
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// If colon is -1, colon+1 will be 0, rendering an empty ns.
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return qname[:colon+1], qname[colon+1:]
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}
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// SplitQNameNs splits a qualified variable name into the first part and the rest.
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func SplitQNameNsFirst(qname string) (ns, rest string) {
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colon := strings.IndexByte(qname, ':')
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if colon == len(qname)-1 {
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// Unqualified variable ending with colon ($name:).
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return "", qname
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}
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// If colon is -1, colon+1 will be 0, rendering an empty ns.
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return qname[:colon+1], qname[colon+1:]
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}
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// SplitIncompleteQNameNsFirst splits an incomplete qualified variable name into
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// the first part and the rest.
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func SplitIncompleteQNameFirstNs(qname string) (ns, rest string) {
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colon := strings.IndexByte(qname, ':')
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// If colon is -1, colon+1 will be 0, rendering an empty ns.
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return qname[:colon+1], qname[colon+1:]
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}
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// SplitQNameNsSegs splits a qualified name into namespace segments.
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func SplitQNameNsSegs(qname string) []string {
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segs := strings.SplitAfter(qname, ":")
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if len(segs) > 0 && segs[len(segs)-1] == "" {
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segs = segs[:len(segs)-1]
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}
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return segs
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}
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