Unmarshal()
(type)Converts a structured file format into structured memory
This is a function you would write when programming a Murex data-type. The unmarshal function takes in a byte slice and returns a Go (golang) type
or struct
or an error.
This unmarshaller is then registered to Murex inside an init()
function and Murex builtins can use that unmarshaller via the UnmarshalData()
API.
Registering Unmarshal()
(for writing builtin data-types)
// To avoid data races, this should only happen inside func init()
/* your type name */ ] = /* your readIndex func */ lang.Unmarshallers[
Using an existing unmarshaller (eg inside a builtin command)
// See documentation on lang.UnmarshalData for more details
string) v, err := lang.UnmarshalData(p *lang.Process, dataType
Defining a marshaller for a murex data-type
package example
import (
"encoding/json"
"github.com/lmorg/murex/lang"
)
func init() {
// Register data-type
"example"] = unmarshal
lang.Unmarshallers[
}
// Describe unmarshaller
func unmarshal(p *lang.Process) (interface{}, error) {
// Read data from STDIN. Because JSON expects closing tokens, we should
// read the entire stream before unmarshalling it. For formats like CSV or
// jsonlines which are more line based, we might want to read STDIN line by
// line. However given there is just one data return, you still effectively
// head to read the entire file before returning the structure. There are
// other APIs for iterative returns for streaming data - more akin to the
// traditional way UNIX pipes would work.
b, err := p.Stdin.ReadAll()if err != nil {
return nil, err
}
var v interface{}
err = json.Unmarshal(b, &v)
// Return the Go data structure or error
return v, err
}
*lang.Process
: Process’s runtime state. Typically expressed as the variable p
Marshal()
(type): Converts structured memory into a structured file format (eg for stdio)lang.MarshalData()
(system API): Converts structured memory into a Murex data-type (eg for stdio)lang.UnmarshalData()
(system API): Converts a Murex data-type into structured memoryThis document was generated from lang/define_unmarshal_doc.yaml.
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Last built on Wed Sep 18 21:18:57 UTC 2024 against commit c037883c03788357164e9846c84d9f777251495d9452a8e.
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