/
eval.go
79 lines (67 loc) · 1.71 KB
/
eval.go
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package expr
import (
"fmt"
"sort"
"strings"
"encoding/json"
"github.com/antonmedv/expr"
"github.com/doublerebel/bellows"
sprig "github.com/Masterminds/sprig/v3"
exprpkg "github.com/argoproj/pkg/expr"
)
func EvalBool(input string, env interface{}) (bool, error) {
result, err := expr.Eval(input, env)
if err != nil {
return false, fmt.Errorf("unable to evaluate expression '%s': %s", input, err)
}
resultBool, ok := result.(bool)
if !ok {
return false, fmt.Errorf("unable to cast expression result '%s' to bool", result)
}
return resultBool, nil
}
var sprigFuncMap = sprig.GenericFuncMap() // a singleton for better performance
func init() {
delete(sprigFuncMap, "env")
delete(sprigFuncMap, "expandenv")
}
func GetFuncMap(m map[string]interface{}) map[string]interface{} {
env := Expand(m)
for k, v := range exprpkg.GetExprEnvFunctionMap() {
env[k] = v
}
env["toJson"] = toJson
env["sprig"] = sprigFuncMap
return env
}
func toJson(v interface{}) string {
output, err := json.Marshal(v)
if err != nil {
return ""
}
return string(output)
}
func Expand(m map[string]interface{}) map[string]interface{} {
return bellows.Expand(removeConflicts(m))
}
// It is possible for the map to contain conflicts:
// {"a.b": 1, "a": 2}
// What should the result be? We remove the less-specific key.
// {"a.b": 1, "a": 2} -> {"a.b": 1, "a": 2}
func removeConflicts(m map[string]interface{}) map[string]interface{} {
var keys []string
n := map[string]interface{}{}
for k, v := range m {
keys = append(keys, k)
n[k] = v
}
sort.Strings(keys)
for i := 0; i < len(keys)-1; i++ {
k := keys[i]
// remove any parent that has a child
if strings.HasPrefix(keys[i+1], k+".") {
delete(n, k)
}
}
return n
}