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ferret/pkg/runtime/expressions/param.go
2018-09-28 21:04:16 -04:00

48 lines
1.0 KiB
Go

package expressions
import (
"context"
"github.com/MontFerret/ferret/pkg/runtime/collections"
"github.com/MontFerret/ferret/pkg/runtime/core"
"github.com/MontFerret/ferret/pkg/runtime/values"
)
type ParameterExpression struct {
src core.SourceMap
name string
}
func NewParameterExpression(src core.SourceMap, name string) (*ParameterExpression, error) {
if name == "" {
return nil, core.Error(core.ErrMissedArgument, "name")
}
return &ParameterExpression{src, name}, nil
}
func (e *ParameterExpression) Iterate(ctx context.Context, scope *core.Scope) (collections.Iterator, error) {
value, err := e.Exec(ctx, scope)
if err != nil {
return nil, core.SourceError(e.src, err)
}
iter, err := collections.ToIterator(value)
if err != nil {
return nil, core.SourceError(e.src, err)
}
return iter, nil
}
func (e *ParameterExpression) Exec(ctx context.Context, scope *core.Scope) (core.Value, error) {
param, err := core.ParamFrom(ctx, e.name)
if err != nil {
return values.None, core.SourceError(e.src, err)
}
return param, nil
}