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