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package kong
import (
"fmt"
"regexp"
)
var interpolationRegex = regexp.MustCompile(`(\$\$)|((?:\${([[:alpha:]_][[:word:]]*))(?:=([^}]+))?})|(\$)|([^$]+)`)
// HasInterpolatedVar returns true if the variable "v" is interpolated in "s".
func HasInterpolatedVar(s string, v string) bool {
matches := interpolationRegex.FindAllStringSubmatch(s, -1)
for _, match := range matches {
if name := match[3]; name == v {
return true
}
}
return false
}
// Interpolate variables from vars into s for substrings in the form ${var} or ${var=default}.
func interpolate(s string, vars Vars, updatedVars map[string]string) (string, error) {
out := ""
matches := interpolationRegex.FindAllStringSubmatch(s, -1)
if len(matches) == 0 {
return s, nil
}
for key, val := range updatedVars {
if vars[key] != val {
vars = vars.CloneWith(updatedVars)
break
}
}
for _, match := range matches {
if dollar := match[1]; dollar != "" {
out += "$"
} else if name := match[3]; name != "" {
value, ok := vars[name]
if !ok {
// No default value.
if match[4] == "" {
return "", fmt.Errorf("undefined variable ${%s}", name)
}
value = match[4]
}
out += value
} else {
out += match[0]
}
}
return out, nil
}
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