50 lines
945 B
Go
50 lines
945 B
Go
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package instruction
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import (
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"strings"
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)
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// Parse from a raw line
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func Parse(raw string) (T, error) {
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// 1. format (trim + split first space)
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raw = strings.Trim(raw, " \t\n")
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cmd := strings.SplitN(raw, " ", 2)
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cmd[0] = strings.Trim(cmd[0], " \t")
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cmd[1] = strings.Trim(cmd[1], " \t")
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// 2. fail if invalid base syntax 'cmd args...'
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// where command is 3 letters
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if len(cmd) < 2 || len(cmd[0]) < 3 || cmd[0][1] == ' ' {
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return nil, ErrInvalidSyntax
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}
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// 3. Extract instruction type
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switch cmd[0] {
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case "ins":
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i := &install{}
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err := i.Build(cmd[1])
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return i, err
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case "del":
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i := &delete{}
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err := i.Build(cmd[1])
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return i, err
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case "upd":
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i := &update{}
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err := i.Build(cmd[1])
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return i, err
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case "ser":
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i := &service{}
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err := i.Build(cmd[1])
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return i, err
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case "cnf":
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i := &config{}
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err := i.Build(cmd[1])
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return i, err
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default:
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return nil, ErrUnknownInstruction
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}
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// return nil, nil
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}
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