snapshot of https://github.com/cortezaproject/corteza.git (2024.9.x, 2026-09-18; blobs > 131072B omitted)

server/system/service/expression.go

@@ -0,0 +1,49 @@
+package service
+
+import (
+	"context"
+	"fmt"
+
+	"errors"
+
+	"github.com/PaesslerAG/gval"
+	"github.com/cortezaproject/corteza/server/pkg/expr"
+)
+
+type (
+	expression struct {
+		parser gval.Language
+	}
+)
+
+func Expression() *expression {
+	return &expression{
+		parser: expr.Parser(),
+	}
+}
+
+func (svc *expression) Evaluate(ctx context.Context, expressions map[string]string, vars map[string]any) (out map[string]any, err error) {
+	out = make(map[string]any, len(expressions))
+	evalErrs := make(map[string]error, len(expressions))
+	hasErr := false
+
+	for k, e := range expressions {
+		out[k], err = svc.parser.Evaluate(e, vars)
+		evalErrs[k] = err
+		hasErr = hasErr || err != nil
+	}
+
+	if !hasErr {
+		return
+	}
+
+	err = nil
+	errMsg := ""
+	for k, e := range evalErrs {
+		if e != nil {
+			errMsg += fmt.Sprintf("%s: %s\n", k, e.Error())
+		}
+	}
+
+	return nil, errors.New(errMsg)
+}