forked from jshiffer/matterbridge
36 lines
865 B
Go
36 lines
865 B
Go
|
package tengo
|
||
|
|
|
||
|
|
import (
|
||
|
|
"context"
|
||
|
|
"fmt"
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Eval compiles and executes given expr with params, and returns an
|
||
|
|
// evaluated value. expr must be an expression. Otherwise it will fail to
|
||
|
|
// compile. Expression must not use or define variable "__res__" as it's
|
||
|
|
// reserved for the internal usage.
|
||
|
|
func Eval(
|
||
|
|
ctx context.Context,
|
||
|
|
expr string,
|
||
|
|
params map[string]interface{},
|
||
|
|
) (interface{}, error) {
|
||
|
|
expr = strings.TrimSpace(expr)
|
||
|
|
if expr == "" {
|
||
|
|
return nil, fmt.Errorf("empty expression")
|
||
|
|
}
|
||
|
|
|
||
|
|
script := NewScript([]byte(fmt.Sprintf("__res__ := (%s)", expr)))
|
||
|
|
for pk, pv := range params {
|
||
|
|
err := script.Add(pk, pv)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("script add: %w", err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
compiled, err := script.RunContext(ctx)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("script run: %w", err)
|
||
|
|
}
|
||
|
|
return compiled.Get("__res__").Value(), nil
|
||
|
|
}
|