mirror of
https://github.com/go-sylixos/elvish.git
synced 2024-12-13 09:57:51 +08:00
67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
package eval
|
|
|
|
import "strings"
|
|
|
|
// ParseVariableRef parses a variable reference.
|
|
func ParseVariableRef(text string) (explode bool, ns string, name string) {
|
|
return parseVariableRef(text, true)
|
|
}
|
|
|
|
// ParseIncompleteVariableRef parses an incomplete variable reference.
|
|
func ParseIncompleteVariableRef(text string) (explode bool, ns string, name string) {
|
|
return parseVariableRef(text, false)
|
|
}
|
|
|
|
func parseVariableRef(text string, complete bool) (explode bool, ns string, name string) {
|
|
explodePart, nsPart, name := splitVariableRef(text, complete)
|
|
ns = nsPart
|
|
if len(ns) > 0 {
|
|
ns = ns[:len(ns)-1]
|
|
}
|
|
return explodePart != "", ns, name
|
|
}
|
|
|
|
// SplitVariableRef splits a variable reference into three parts: an optional
|
|
// explode operator (either "" or "@"), a namespace part, and a name part.
|
|
func SplitVariableRef(text string) (explodePart, nsPart, name string) {
|
|
return splitVariableRef(text, true)
|
|
}
|
|
|
|
// SplitIncompleteVariableRef splits an incomplete variable reference into three
|
|
// parts: an optional explode operator (either "" or "@"), a namespace part, and
|
|
// a name part.
|
|
func SplitIncompleteVariableRef(text string) (explodePart, nsPart, name string) {
|
|
return splitVariableRef(text, false)
|
|
}
|
|
|
|
func splitVariableRef(text string, complete bool) (explodePart, nsPart, name string) {
|
|
if text == "" {
|
|
return "", "", ""
|
|
}
|
|
e, qname := "", text
|
|
if text[0] == '@' {
|
|
e = "@"
|
|
qname = text[1:]
|
|
}
|
|
if qname == "" {
|
|
return e, "", ""
|
|
}
|
|
i := strings.LastIndexByte(qname, ':')
|
|
if complete && i == len(qname)-1 {
|
|
i = strings.LastIndexByte(qname[:len(qname)-1], ':')
|
|
}
|
|
return e, qname[:i+1], qname[i+1:]
|
|
}
|
|
|
|
// MakeVariableRef builds a variable reference.
|
|
func MakeVariableRef(explode bool, ns string, name string) string {
|
|
prefix := ""
|
|
if explode {
|
|
prefix = "@"
|
|
}
|
|
if ns != "" {
|
|
prefix += ns + ":"
|
|
}
|
|
return prefix + name
|
|
}
|