47 lines
941 B
Go
47 lines
941 B
Go
package filtering
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import (
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"fmt"
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"os"
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"github.com/araddon/qlbridge/datasource"
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"github.com/araddon/qlbridge/expr"
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"github.com/araddon/qlbridge/value"
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"github.com/araddon/qlbridge/vm"
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)
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type ExprValue struct {
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Node expr.Node
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}
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func (e *ExprValue) String() string {
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if e.Node != nil {
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return e.Node.String()
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} else {
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return "<Empty Expression>"
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}
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}
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func (e *ExprValue) Set(value string) error {
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ast, err := expr.ParseExpression(value)
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if err != nil {
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return err
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}
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e.Node = ast
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return nil
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}
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func (e *ExprValue) Validate(line map[string]interface{}) bool {
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context := datasource.NewContextSimpleNative(line)
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val, ok := vm.Eval(context, e.Node)
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if !ok || val == nil { // errors when evaluating
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return false
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}
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if val.Type() != value.BoolType {
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fmt.Fprintln(os.Stderr, "WARNING: The 'where' expression doesn't return a boolean")
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return false
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}
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if val.Value().(bool) != true {
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return false
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}
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return true
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}
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