mirror of https://github.com/databricks/cli.git
74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
package dynvar
|
|
|
|
import (
|
|
"regexp"
|
|
|
|
"github.com/databricks/cli/libs/dyn"
|
|
)
|
|
|
|
var re = regexp.MustCompile(`\$\{([a-zA-Z]+([-_]?[a-zA-Z0-9]+)*(\.[a-zA-Z]+([-_]?[a-zA-Z0-9]+)*(\[[0-9]+\])*)*(\[[0-9]+\])*)\}`)
|
|
|
|
// ref represents a variable reference.
|
|
// It is a string [dyn.Value] contained in a larger [dyn.Value].
|
|
// Its path within the containing [dyn.Value] is also stored.
|
|
type ref struct {
|
|
// Original value.
|
|
value dyn.Value
|
|
|
|
// String value in the original [dyn.Value].
|
|
str string
|
|
|
|
// Matches of the variable reference in the string.
|
|
matches [][]string
|
|
}
|
|
|
|
// newRef returns a new ref if the given [dyn.Value] contains a string
|
|
// with one or more variable references. It returns false if the given
|
|
// [dyn.Value] does not contain variable references.
|
|
//
|
|
// Examples of a valid variable references:
|
|
// - "${a.b}"
|
|
// - "${a.b.c}"
|
|
// - "${a} ${b} ${c}"
|
|
func newRef(v dyn.Value) (ref, bool) {
|
|
s, ok := v.AsString()
|
|
if !ok {
|
|
return ref{}, false
|
|
}
|
|
|
|
// Check if the string contains any variable references.
|
|
m := re.FindAllStringSubmatch(s, -1)
|
|
if len(m) == 0 {
|
|
return ref{}, false
|
|
}
|
|
|
|
return ref{
|
|
value: v,
|
|
str: s,
|
|
matches: m,
|
|
}, true
|
|
}
|
|
|
|
// isPure returns true if the variable reference contains a single
|
|
// variable reference and nothing more. We need this so we can
|
|
// interpolate values of non-string types (i.e. it can be substituted).
|
|
func (v ref) isPure() bool {
|
|
// Need single match, equal to the incoming string.
|
|
if len(v.matches) == 0 || len(v.matches[0]) == 0 {
|
|
panic("invalid variable reference; expect at least one match")
|
|
}
|
|
return v.matches[0][0] == v.str
|
|
}
|
|
|
|
func (v ref) references() []string {
|
|
var out []string
|
|
for _, m := range v.matches {
|
|
out = append(out, m[1])
|
|
}
|
|
return out
|
|
}
|
|
|
|
func IsPureVariableReference(s string) bool {
|
|
return len(s) > 0 && re.FindString(s) == s
|
|
}
|